JPH0317830A - Copying machine for magnetic recording information - Google Patents

Abstract

PURPOSE:To perform transfer recording satisfactorily by arranging a magnetic gap at the front of the E-type core of a magnetic head for generating bias magnetic field for transfer by neighboring and deviating to the center of the pressurizing area of a recording medium. CONSTITUTION:The magnetic gap g2' out of two magnetic gaps g1' and g2' formed between the central electrode 2' and two side electrodes 3' and 4' of the E-type core of the magnetic head H is arranged in a nonmagnetic cylinder by deviating to a position neighboring to the center position P of a tape pressurizing area 9. By constituting a device in such a manner, the strength of a perpendicular magnetic field generated with the head H goes to the one shown in the curve II of alternate long and two short dashes line in figure, and the strength of a bias magnetic field passing the tape pressurizing area 9 is attenuated to zero finally as shown C a b in figure, and at the time when it is separated from the area 9, no magnetic field which performs demagnetization functions on the recording medium and satisfactory transfer is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a copying device for magnetically recorded information. (Prior Art) Magnetic recording information copying devices that transfer magnetic recording information recorded on a recorded magnetic recording medium to an unrecorded magnetic recording medium have various configurations. One such method is to combine a recorded magnetic recording medium (master tape) that has been previously recorded with horizontal magnetization and an unrecorded magnetic recording medium (slave tape) that is to be recorded with vertical magnetization as described above. With the magnetic surfaces of each magnetic recording medium in close contact with each other, the magnetic recording medium is passed through a bias magnetic field for transfer in a direction perpendicular to the direction of the magnetic field, and the recorded magnetic recording medium (master tape) is recorded with horizontal magnetization. 2. Description of the Related Art There is known a copying apparatus for magnetically recorded information that transfers recorded magnetically recorded information to an unrecorded magnetic recording medium (slave tape) as magnetically recorded information in the form of perpendicular magnetization recording. In the previously proposed magnetic recording information copying apparatus described above, a recorded magnetic recording medium (master tape) and an unrecorded magnetic recording medium (slave tape) are passed through a bias magnetic field for transfer in a state in which they are in close contact with each other. Conventionally, the recorded magnetic recording medium and the unrecorded magnetic recording medium are brought into close contact with each other on the surface of a transfer drum made of a soft magnetic material that is driven and rotated. The conventional method was to use compressed air to press the parts together. However, in a magnetically recorded information copying apparatus configured such that compressed air is used to bring a recorded magnetic recording medium and an unrecorded magnetic recording medium into close contact with each other as described above, the entire copying apparatus is complicated and , Since it is a large-scale project, the pressure bonding between a recorded magnetic recording medium and an unrecorded magnetic recording medium is performed using a rotating cylindrical body made of a non-magnetic material with a built-in magnetic head for generating a bias magnetic field for transfer. A copying apparatus for magnetically recorded information was devised using a roller as shown in FIG. In FIG. 6, which shows an example of the previously proposed copying device for magnetically recorded information, 1 is a cylinder made of a non-magnetic material;
The inside of the E-type core has a central magnetic pole 2 and side magnetic poles 3.4 arranged on both sides of the central magnetic pole 2 with a magnetic gap gLg2 between the central magnetic pole 2 and the E-shaped core 5. A magnetic head H for generating a bias magnetic field for transcription is built in, and includes a coil 5 attached to the mold core. Reference numeral 6 denotes a rotating roller, and the rotating roller 6 has a cylindrical body 7 made of a soft magnetic material (for example, MnZn ferrite) and a non-magnetic elastic material (for example, urethane-based high elastic rubber) 11 on the surface of the cylindrical body 7. It has a structure in which a coating layer 8 of is deposited. Furthermore, T1 is a recorded magnetic recording medium (master tape) on which predetermined information is recorded with horizontal magnetization, and T2 is an unrecorded magnetic recording medium (slave tape) on which predetermined information is to be recorded with vertical magnetization. The magnetic recording medium Tl and the unrecorded magnetic recording medium T2 are placed so that their magnetic surfaces face each other and brought into close contact with each other with a predetermined pressure required for transferring the magnetically recorded information. It is sandwiched between the outer peripheral surface of the cylindrical body 1 made of a non-magnetic material and the outer peripheral surface of the rotating roller 6, and is moved in the direction of the arrow X in the figure as the rotating roller 6 rotates. ing. In order to explain the operation of the previously proposed copying apparatus for magnetically recorded information shown in FIG. 6, FIG. 7 shows an enlarged view of the circle marked with a broken line in FIG. This is a diagram. In the previously proposed copying device for magnetically recorded information shown in FIG. The recording medium Tl and the unrecorded magnetic recording medium T2 are brought into close contact with each other with a predetermined pressure required for transferring magnetically recorded information in the tape pressure contact area 9 indicated by diagonal lines in FIG. It has been made into a state of being. The range of the tape pressing area 9 described above is determined by the diameter of the cylindrical body 1 made of a non-magnetic material, the diameter of the rotating roller 6, and the soft magnetic material (for example, M
The structure of the coating layer 8 made of a non-magnetic elastic material (e.g. urethane-based high elastic rubber) which is coated on the surface of the cylinder made of a cylindrical body made of a cylindrical body made of a cylindrical body made of a cylindrical body made of a cylindrical body made of a cylindrical body made of The rotation center of the cylindrical body 1 made of a non-magnetic material and the rotation center of the rotary roller 6 may vary depending on the magnitude of the pressing force applied between the body 1 and the rotating roller 6. A tape pressure contact area 9 is formed in a predetermined range centered on the intersection point P with mc-c connecting the . The leakage magnetic flux generated in the magnetic gap gL g2 of the magnetic head H built in the previously mentioned cylindrical body 1 made of non-magnetic material is transmitted to the outer peripheral surface of the cylindrical body 1 made of non-magnetic material and the outer periphery of the rotating roller 6. The unrecorded magnetic recording medium T is clamped between the surface and the
2 and a portion of the recorded magnetic recording medium TI including the tape pressure contact area 9, and a coating layer 8 of a non-magnetic elastic material (for example, urethane-based high elastic rubber) II on the surface of the rotating roller 6.
After reaching the cylindrical body 7 of the soft magnetic material (for example, MnZn ferrite) H that constitutes the main body of the rotating roller 6, the The cylindrical body 7 is made of a soft magnetic material (for example, MnZn ferrite), and the coating layer 8 is made of a non-magnetic elastic material (for example, urethane-based high elasticity rubber) on the surface of the rotating roller 6, and the recorded material is It penetrates through the magnetic recording medium T1 and the unrecorded magnetic recording medium T2 other than the tape pressure contact area 9 and returns to the side magnetic poles 3 and 4 of the magnetic head H. Then, the perpendicular magnetic field described above is applied so that the perpendicular magnetic field generated by the leakage magnetic flux generated in the magnetic gap gLg2 of the magnetic head H built in the cylindrical body 1 made of a non-magnetic material is used as the transfer bias magnetic field. is smaller than the coercive force of the recorded magnetic recording medium TI, and the magnetic field strength is about 2 to 3 times the coercive force of the unrecorded magnetic recording medium T2. Therefore, in the previously proposed copying apparatus for magnetically recorded information shown in FIG. The recorded magnetic recording medium T1 and the unrecorded magnetic recording medium T2 are in the seventh
The tape is brought into close contact with a predetermined pressure necessary for transferring the magnetic recording information in the tape pressure contact area 9 shown by diagonal lines in the figure, and is made to pass through a transfer bias magnetic field. By doing so, the magnetic recording information of the recorded magnetic recording medium T1 is transferred to the unrecorded magnetic recording medium T2.
The unrecorded magnetic recording medium T2 becomes a recorded copy. (Problem to be Solved by the Invention) By the way, in the already proposed copying device for magnetically recorded information shown in FIG. magnetic head H for
However, as in the case of the E-type core, a part of which is shown by a solid line downward in FIG. Since it was installed in a cylindrical body 1 made of a magnetic material, the magnetic field strength distribution of the transfer bias magnetic field generated by the magnetic head H for generating the transfer bias magnetic field is shown in the upper part of Fig. 1. The curve shown as a solid line in the characteristic curve example diagram showing the relationship between the position in the running direction X of the magnetic recording medium and the perpendicular magnetic field strength Hy! The transfer bias magnetic field generated by the magnetic head H for generating the transfer bias magnetic field has the magnetic field strength shown in g to h in the figure corresponding to the tape pressure contact area 9. This shows the distribution. By the way, the recorded magnetic recording medium TI, which has been previously recorded with horizontal magnetization, and the unrecorded magnetic recording medium T2, which is to be recorded with perpendicular magnetization, are placed in a state in which the magnetic surfaces of the magnetic recording media are in close contact with each other. , the magnetic recording information recorded in the horizontal magnetization recording form on the recorded magnetic recording medium T1 is transferred to the unrecorded magnetic recording medium T2 by passing it through a bias magnetic field for transfer in the direction X perpendicular to the direction of the magnetic field.
In order to successfully transfer magnetic recording information in the form of perpendicular magnetization recording, the recorded magnetic recording medium Tl and the unrecorded magnetic recording medium T2 are placed in a state in which their magnetic surfaces are in close contact with each other. While the recorded magnetic recording medium Tl and the unrecorded magnetic recording medium T2 are passing through the tape pressure contact area 9, both the magnetic recording media Tl and T2 are
The strength of the transfer bias magnetic field applied to 2 is the characteristic curve shown by the solid line at the top of FIG. a- in
It is necessary that the magnetic field strength eventually attenuates to zero as shown in 4h→f. However, in the previously proposed copying apparatus for magnetically recorded information shown in FIG. Since it was installed in the cylindrical body 1 made of a non-magnetic material in such a manner that the center P coincides with the tape pressure contact area 9, the transfer bias magnetic field generated by the magnetic head H for generating the transfer bias magnetic field corresponds to the tape pressure contact area 9. In the figure. The magnetic field strength distribution is as shown in -h, and even when the magnetic recording media Tl, T2 leave the tape pressure contact area 9, the magnetic recording media Tl, T2
A magnetic field with a large magnetic field strength is applied to T2. By the way, as mentioned above, the magnetic recording medium T
The magnetic field portion after the time when I and T2 leave the tape pressure contact area 9 is determined by the transfer bias as shown by the h-4f portion of the solid line characteristic curve I shown in the upper part of FIG. Since the magnetic field strength distribution is in the demagnetization process, good transfer recording cannot be performed on the magnetic recording medium T2. Moreover, the magnetic recording medium Tl. Even after T2 leaves the tape pressing area 9, the magnetic recording continues through the large magnetic field strength part shown by the solid line characteristic curve f-) 6 shown in the upper part of FIG. medium Tl,
Another problem is that T2 is demagnetized. By the way, in a perpendicular magnetic recording and reproducing system that magnetically records and reproduces information signals using a perpendicular magnetic recording medium constructed by laminating a perpendicularly magnetized film and a horizontally magnetized film, the main magnetic pole (center The magnetic head has a small cross-sectional area within the range that does not cause magnetic saturation, and the side magnetic poles on both sides of the main magnetic pole have as large an area as possible. It is well known that attempts have been made to form a perpendicular magnetic field that shows a magnetic field strength distribution. Since the structure is such that the side magnetic poles have as large an area as possible, and a steep magnetic field strength distribution is formed in the main magnetic pole part, the previously proposed magnetic recording information illustrated in FIG. Like a copying machine, a recorded magnetic recording medium TI and an unrecorded magnetic recording medium T2 are placed between the outer circumferential surface of a cylindrical body 1 made of a non-magnetic material and the outer circumferential surface of a rotating roller 6 under a predetermined pressure. sandwich it,
As a magnetic head in which a perpendicular magnetic field is applied to a magnetic recording medium by a magnetic head equipped with an E-shaped core built into the cylindrical body 1 made of a non-magnetic material,
It is difficult to apply the magnetic head in the perpendicular magnetic recording and reproducing method described above to form a perpendicular magnetic field that exhibits a steep magnetic field strength distribution in the central magnetic pole (main magnetic pole) portion of the E-shaped core. That is, in the previously proposed copying apparatus for magnetically recorded information illustrated in FIG. It is necessary to sandwich the recording magnetic recording medium T2 with a predetermined pressure in the tape pressure contact area, and to apply a transfer bias magnetic field of a predetermined intensity to the magnetic recording medium in the tape pressure contact area. However, as a magnetic head to be built into the cylindrical body 1 made of non-magnetic material, as in the magnetic head in the perpendicular magnetic recording/reproducing method described above, the side magnetic poles on both sides of the main magnetic pole with a small cross-sectional area are made to have as large an area as possible. When a steep magnetic field strength distribution is formed in the main pole part, a cylindrical body 1 made of a non-magnetic material is used to house the magnetic head. Therefore, a large diameter one is required. As mentioned above. When a large-diameter cylindrical body l made of a non-magnetic material is used, it goes without saying that there is a gap between the outer circumferential surface of the cylindrical body l made of a non-magnetic material and the outer circumferential surface of the rotating roller 6. Since the tape pressure contact area between the recorded magnetic recording medium T1 and the unrecorded magnetic recording medium T2 that are sandwiched is large, the recorded magnetic recording medium TI and the unrecorded magnetic recording medium T2 are placed in the tape pressure contact area. A large amount of pressure must be applied between the cylindrical body 1 made of the non-magnetic material and the rotating roller 6 in order to clamp them at a predetermined pressure. Therefore, the cylindrical body ↓ and the rotating roller 6 made of non-magnetic material are required to have mechanical strength that can withstand the pressure, so the cylindrical body 1 made of non-magnetic material is A cylinder with a large thickness is used as the rotating roller 6, but if the cylinder 1 made of a non-magnetic material with a large thickness is used, the recorded magnetic recording medium T
1 and an unrecorded magnetic recording medium T2, a tape pressure contact area;
Since the distance from the magnetic head provided inside the cylindrical body 1 made of non-magnetic material increases, the high frequency power supplied to the magnetic head to generate the required strength of vertical magnetic field increases. Problems include unnecessary radiation, heat generation in the core, and difficulty in generating a good vertical magnetic field. (Means for Solving the Problems) The present invention includes an E-shaped core having a central magnetic pole and side magnetic poles disposed on both sides of the central magnetic pole with a magnetic gap interposed between the central magnetic pole and the central magnetic pole. A cylindrical body made of a non-magnetic material with a built-in magnetic head for generating a bias magnetic field for transfer, a rotary roller mainly composed of at least a cylindrical body made of a soft magnetic material, and a bias for transfer as described above. In a transfer bias magnetic field generated by a magnetic head for generating a magnetic field, when the magnetic surface of the recorded magnetic recording medium and the magnetic surface of the unrecorded magnetic recording medium are facing each other,
means for moving the cylindrical body made of the non-magnetic material and the rotating roller in a state where they are sandwiched and pressed together; and a central magnetic pole in the E-shaped core of the magnetic head for generating a bias magnetic field for transfer. Of the two magnetic gaps formed between the two side magnetic poles, the one at the front with respect to the traveling direction of the magnetic recording medium is sandwiched between the above-mentioned cylindrical body made of a non-magnetic material and the above-mentioned rotating roller. The magnetic field for generating the bias magnetic field for transfer is positioned close to the center position of the pressure area between the magnetic surface of the recorded magnetic recording medium and the magnetic surface of the unrecorded magnetic recording medium formed by A copying device for magnetically recorded information, comprising: means for disposing a head in a cylindrical body made of a non-magnetic material; A cylindrical body made of a non-magnetic material and at least a cylindrical body made of a soft magnetic material, which has a built-in magnetic head for generating a bias magnetic field for transfer, which is constituted by an E-shaped core having a side magnetic pole and a side magnetic pole. The magnetic surface of the recorded magnetic recording medium and the magnetic surface of the unrecorded magnetic recording medium in the transfer bias magnetic field generated by the rotating roller configured as and a magnetic head for generating a bias magnetic field for transfer. Of the two side magnetic poles in the E-type core, the surface of the one in front of the central magnetic pole in the direction of movement of the magnetic recording medium is formed by being sandwiched between the aforementioned cylindrical body made of a non-magnetic material and a rotating roller. A transfer bias is applied so that the magnetic surface of the recorded magnetic recording medium and the magnetic surface of the unrecorded magnetic recording medium are in pressure contact with each other so as to occupy a position spaced apart in a direction perpendicular to the surface of the pressure contact region. The central magnetic pole and 2 in the E-type core of the magnetic head for magnetic field generation.
Within the two magnetic gaps formed between the two side magnetic poles,
The magnetic surface of the recorded magnetic recording medium and the magnetism of the unrecorded magnetic recording medium are formed by sandwiching the cylindrical body made of a non-magnetic material and the rotating roller, the one at the front with respect to the traveling direction of the magnetic recording medium. and means for disposing the magnetic head for generating a bias magnetic field for transfer in a cylindrical body made of a non-magnetic material so as to occupy a position close to the center position of the area in pressure contact with the surface. A device for generating a bias magnetic field for transfer, which includes a device, and an E-shaped core having a central magnetic pole and side magnetic poles arranged on both sides of the central magnetic pole with a magnetic gap interposed between the central magnetic pole and the central magnetic pole. A cylindrical body made of a non-magnetic material with a built-in magnetic head, a rotating roller mainly composed of at least a cylindrical body made of a soft magnetic material, and a magnetic head for generating a bias magnetic field for transfer generated by the above-mentioned magnetic head. In a transfer bias magnetic field, the cylindrical body made of a non-magnetic material and the rotating roller are placed in a state where the magnetic surface of the recorded magnetic recording medium and the magnetic surface of the unrecorded magnetic recording medium face each other. of the two side magnetic poles in the E-shaped core of the magnetic head for generating a bias magnetic field for transfer, which is closer to the central magnetic pole in the traveling direction of the magnetic recording medium. In the thickness direction of the front one, the surface of the portion excluding both ends is the magnetic surface of the recorded magnetic recording medium formed by sandwiching the above-mentioned cylindrical body made of non-magnetic material and the rotating roller, and the unrecorded magnetic surface. It occupies a position spaced apart in a direction perpendicular to the surface of the pressure contact area with respect to the pressure contact area with the magnetic surface of the magnetic recording medium, and the surfaces of both ends of the side magnetic poles are made of the above nonmagnetic material. It occupies a position close to the pressure contact area between the magnetic surface of a recorded magnetic recording medium and the magnetic surface of an unrecorded magnetic recording medium formed by sandwiching between a cylindrical body and a rotating roller, and a transfer bias. Of the two magnetic gaps formed between the central magnetic pole and the two side magnetic poles in the E-shaped core of the magnetic head for generating a magnetic field, the one at the front with respect to the traveling direction of the magnetic recording medium is made of the above-mentioned non-magnetic material. occupies a position close to the center position of the pressure contact area between the magnetic surface of the recorded magnetic recording medium and the magnetic surface of the unrecorded magnetic recording medium, which is formed by sandwiching between a cylindrical body made of aluminum and a rotating roller. A copying apparatus for magnetically recorded information is provided, comprising means for disposing the magnetic head for generating a bias magnetic field for transfer in a cylindrical body made of a non-magnetic material. (Function) A transfer bias magnetic field generating device comprising an E-shaped core having a central magnetic pole and side magnetic poles arranged on both sides of the central magnetic pole with a magnetic gap between the central magnetic pole and the central magnetic pole. Between a cylindrical body made of a non-magnetic material containing a magnetic head and a rotating roller mainly composed of a cylindrical body made of at least a soft magnetic material, the magnetic surface of the recorded magnetic recording medium and the unrecorded magnetic surface are separated. The recorded magnetic recording medium is sandwiched between the magnetic surfaces of the magnetic recording medium facing each other, and the recorded magnetic recording medium is placed in the transfer bias magnetic field generated by the magnetic head for generating the transfer bias magnetic field. A magnetic surface and an unrecorded magnetic recording medium are moved in close contact. Of the two magnetic gaps formed between the central magnetic pole and the two side magnetic poles in the E-shaped core of the magnetic head for generating a bias magnetic field for transfer, the one at the front with respect to the traveling direction of the magnetic recording medium is the one described above. A pressure contact area (tabe pressure contact area) between the magnetic surface of a recorded magnetic recording medium and the magnetic surface of an unrecorded magnetic recording medium, which is formed by sandwiching the cylindrical body made of a non-magnetic material and the above-mentioned rotating roller. The intensity of the bias magnetic field for transfer is set to zero or close to zero within the tape pressure contact area so as to occupy a position close to the center position of the tape. Also, of the two side magnetic poles in the E-type core of the magnetic head for generating a bias magnetic field for transfer, the surface of the one forward of the central magnetic pole with respect to the traveling direction of the magnetic recording medium is in contact with the tape pressure contact area. Two magnetic poles are formed between a central magnetic pole and two side magnetic poles in an E-shaped core of a magnetic head for generating a bias magnetic field for transfer, and occupy positions spaced apart in a direction perpendicular to the surface of the pressure contact area. The intensity of the bias magnetic field for transfer is controlled within the tape pressure contact area so that the front part of the magnetic gap in the traveling direction of the magnetic recording medium occupies a position close to the center position of the tape pressure contact area. Bring it to zero or close to zero. Furthermore, of the two side magnetic poles of the E-type core of the magnetic head for generating a bias magnetic field for transfer, the surface of the portion of the one forward of the central magnetic pole with respect to the traveling direction of the magnetic recording medium, excluding both ends in the thickness direction. occupies a position separated from the tape pressure contact area in a direction perpendicular to the surface of the tape pressure contact area, and is located at a position such that the surfaces of both ends of the side magnetic pole are close to the tape pressure contact area. Of the two magnetic gaps formed between the central magnetic pole and the two side magnetic poles in the E-shaped core of the magnetic head for generating a bias magnetic field for transfer, the one that is located in the front with respect to the traveling direction of the magnetic recording medium. occupies a position close to the center of the tape pressure contact area, and the intensity of the bias magnetic field for transfer is brought to zero or close to zero within the tape pressure contact area. (Example) Hereinafter, specific contents of the magnetically recorded information copying apparatus of the present invention will be explained in detail with reference to the attached drawings. FIGS. 1, 4, and 5 show a portion where a bias magnetic field for transfer is generated in a copying apparatus for magnetically recorded information according to different embodiments of the present invention, and a bias for transfer in an already proposed copying apparatus for magnetically recorded information. FIGS. 2 and 3 are diagrams illustrating a comparison of the structure and the magnetic field strength distribution with respect to the magnetic field generation portion, and FIGS. It is a perspective view of the E-type core. The magnetic recording information copying device of the present invention is a copying device to be built in a cylindrical body l made of a non-magnetic material in the previously proposed magnetic recording information copying device already described with reference to FIGS. 6 and 7. The only difference is in the configuration of the part that generates the bias magnetic field for use, so the components other than the internal components of the cylindrical body 1 made of non-magnetic material in FIG. It is also used to explain the overall configuration of a copying machine. The overall configuration of the magnetically recorded information copying apparatus of the present invention is as follows.
Similar to the previously proposed copying device for magnetically recorded information shown in the figure, it has a cylindrical body made of a non-magnetic material containing a magnetic head H for generating a bias magnetic field for transfer, and a cylindrical body made of a non-magnetic material as described above. The cylindrical body 1 is provided with a rotary roller 6 disposed facing the cylindrical body 1, and a recorded magnetic recording medium (master tape) Tl on which predetermined information is recorded by horizontal magnetization, and an unrecorded magnetic recording medium to be recorded by perpendicular magnetization. The magnetic recording medium (slave tape) T2 is placed with its magnetic surfaces facing each other, and the non-magnetic sandwiched between the outer circumferential surface of the cylindrical body l made of body material and the outer circumferential surface of the rotating roller 6,
As the rotating roller 6 rotates, it is moved in the direction of arrow X in the figure. The rotating roller 6 described above is made of a soft magnetic material (for example, M n
A coating layer 8 made of a non-magnetic elastic material (for example, urethane-based high elastic rubber) is adhered to the surface of a cylindrical body made of Zn ferrite. In one embodiment of the magnetic recording information copying apparatus of the present invention, a cylindrical body 1 made of a non-magnetic material
The magnetic head H for generating a bias magnetic field for transfer to be built in is connected to the central magnetic pole 2' and the aforementioned central magnetic pole 2', as shown in part by the two-dot chain line at the bottom of FIG. E having side magnetic poles 3'4' arranged on both sides of the central magnetic pole 2' with a magnetic gap gl'pg2' therebetween.
It consists of a molded core and a coil (not shown). The magnetic head H for generating a bias magnetic field for transfer has two magnetic gaps g1 formed between the central magnetic pole 2' and the two side magnetic poles 3' and 4' in its E-shaped core. Among 'p g 2', the one g21 at the front with respect to the traveling direction X of the magnetic recording medium is the cylindrical body 1 made of non-magnetic material (see Fig. 6. Illustration is omitted in Fig. 1) A position close to the center position of the tape pressure contact area 9 between the magnetic surface of the recorded magnetic recording medium and the magnetic surface of the unrecorded magnetic recording medium, which are formed by nipping between the magnetic recording medium and the rotating roller 6 (see FIG. 6). It is installed inside a cylindrical body made of non-magnetic material so that it occupies the entire area. The tape pressing area 9 shown with diagonal lines in FIG. The recorded magnetic recording medium Tl and the unrecorded magnetic recording medium T2, which are sandwiched between the outer peripheral surfaces of This is an area where The range of the tape pressing area 9 described above is determined by the diameter of the cylindrical body l made of a non-magnetic material, the diameter of the rotating roller 6, and the soft magnetic material forming the main body of the rotating roller 6.
The structure of the coating layer 8 made of a non-magnetic elastic material (for example, urethane-based high elastic rubber) that is coated on the surface of the cylinder made of MnZn ferrite) and the cylinder made of non-magnetic material 1 and the rotating roller 6, but in any case, the rotation center of the cylindrical body 1 made of non-magnetic material and the rotation center of the rotating roller 6 are A tape pressure contact area 9 is formed in a predetermined range centered on the intersection point P of the connecting @C-C. The magnetic head H for generating a bias magnetic field for transfer, which is indicated by the two-dot chain line in FIG.
A central pole 2' and two side poles 3', 4 in the mold core
Of the two magnetic gaps gl'sg2' formed between g and g, the one in front with respect to the traveling direction
2' is the center of the tape pressure contact area 9! Since it is provided in the cylindrical body made of non-magnetic material so as to occupy a position close to the IP, the magnetic gap gl'+g2' of the magnetic head H built in the cylindrical body 1 made of non-magnetic material The leakage magnetic flux generated in the unrecorded magnetic recording medium T2 and the recorded magnetic recording medium TL sandwiched between the outer circumferential surface of the cylindrical body 1 made of a non-magnetic material and the outer circumferential surface of the rotating roller 6 Non-magnetic elastic material (for example, urethane-based high elastic rubber) on the surface of the rotating roller 6 and the area including the tape pressure contact area 9
After reaching the cylindrical body 7 made of a soft magnetic material (for example, MnZn ferrite), which constitutes the main body of the rotating roller 6, the coating layer 8 of the rotating roller 6 described above is penetrated. A soft magnetic material (for example, M n
The coating layer 8 (see FIG. 6) of a non-magnetic elastic material (for example, urethane-based high elastic rubber) It on the surface of the rotating roller 6 described above is , the side magnetic poles 3' . Return to 4'. Then, as mentioned above, the magnetic air Fl! of the magnetic head H built in the cylindrical body 1 made of non-magnetic material! llg1″,g
As described above, the perpendicular magnetic field generated by the leakage magnetic flux generated in the magnetic recording medium T2'' is used as the transfer bias magnetic field.The perpendicular magnetic field is smaller than the coercive force of the recorded magnetic recording medium T1,
Furthermore, the magnetic field strength is approximately two to three times the coercive force of the unrecorded magnetic recording medium T2. Therefore, in the magnetic recording information copying apparatus, the recorded magnetic recording medium T1 and the unrecorded magnetic recording medium are clamped between the outer circumferential surface of the cylindrical body 1 made of a non-magnetic material and the outer circumferential surface of the rotating roller 6. T2 and T2 are brought into close contact with each other with a predetermined pressure required for transferring magnetically recorded information in the tape pressure contact area 9 indicated by diagonal lines in FIG. 1, and placed in a transfer bias magnetic field. As a result, the magnetic recording information on the recorded magnetic recording medium Tl is transferred to the unrecorded magnetic recording medium T2, and the unrecorded magnetic recording medium T2 becomes a recorded copy. Magnetic recording information according to an embodiment of the present invention, in which a magnetic head H for generating a bias magnetic field for transfer, shown by a two-dot chain line in FIG. 1, is built into a cylindrical body 1 made of a non-magnetic material In this copying machine, the center magnetic pole 2' of the E-type core, a part of which is shown by the two-dot chain line downward in FIG. In this manner, within the two magnetic gaps g 1' r g 2' formed between the central magnetic pole 2' and the two side magnetic poles 3' and 4' in the E-shaped core, the direction of travel of the magnetic recording medium is Since the part g 21 in the front with respect to The distribution of the magnetic field strength of the transfer bias magnetic field generated by the magnetic head H of is shown in the characteristic curve showing the relationship between the position in the running direction X of the magnetic recording medium and the perpendicular magnetic field strength HY shown in the upper part of FIG. The curve ■ shown by the two-dot chain line in the example figure is shown, and the transfer bias magnetic field generated by the magnetic head H for generating the transfer bias magnetic field corresponds to the tape pressure contact area 9, as shown by the two-dot chain line in the figure. This shows the magnetic field strength distribution shown in curve ⅠQ-4a-*l). As mentioned above, the recorded magnetic recording medium Tl, which has been previously recorded with horizontal magnetization, and the unrecorded magnetic recording medium T2, which is to be recorded with perpendicular magnetization, are brought into close contact with each other, so that the magnetic surfaces of each of the magnetic recording media are brought into close contact with each other. In this state, the magnetic recording information recorded in the horizontal magnetization recording form on the recorded magnetic recording medium T1 is passed through the bias magnetic field for transfer in the direction X perpendicular to the direction of the magnetic field, and the unrecorded magnetic information is In order to successfully transfer the magnetic recording information in the perpendicular magnetization recording format to the recording medium T2, it is necessary to
The recorded magnetic recording medium Tl and the unrecorded magnetic recording medium T are shown in the tape pressure contact area 9 where the magnetic surfaces of the magnetic recording medium T1 and the unrecorded magnetic recording medium T2 are in close contact with each other.
2 is passing, both magnetic recording media Tl mentioned above
．． Although it is necessary to follow a course in which the intensity of the bias magnetic field for transfer applied to T2 eventually attenuates to zero, in the copying apparatus for magnetically recorded information according to an embodiment of the present invention, the transfer The transfer bias magnetic field generated by the magnetic head H for generating the bias magnetic field has a magnetic field strength distribution shown in C→a→b of the characteristic curve (■) in FIG. 1, corresponding to the tape pressure contact area 9. Therefore, when the magnetic recording media Tl, T2 leave the tape pressure contact area 9, the magnetic recording media TI
, T2 are kept in a state where no magnetic field with a large magnetic field strength is applied, and good transfer recording is performed on the magnetic recording medium T2. Further, even after the magnetic recording media Tl and T2 have left the tape pressure contact area 9, the magnetic field strength portion shown by the part b-}d of the curve 2 shown by the two-dot chain line shown in the upper part of FIG. However, since the magnetic field strength is small in the magnetic field strength portion indicated by the part b→d in the curve (2) indicated by the two-dot chain line shown above in FIG.
l, T2 will not be significantly demagnetized. Next, FIGS. 2 and 3 respectively show a bias magnetic field generating device for transfer, which is built in a cylindrical body l made of a non-magnetic material in another embodiment of the magnetically recorded information copying apparatus of the present invention. FIG. 2 is a perspective view of an E-shaped core used in the configuration of a magnetic head H. In the E-shaped core of the magnetic head H for generating a bias magnetic field for transfer shown in FIG. The magnetic poles include a central magnetic pole 10 and side magnetic poles 11.
A magnetic gap 16 is formed between the central magnetic pole 10 and the side magnetic poles 12, and a magnetic gap 17 is formed between the central magnetic pole 10 and the side magnetic poles 12. In the E-shaped core shown in FIG. 2, two side magnetic poles 11.
One side magnetic pole 11 of 12, that is, located in front of the central magnetic pole 10 with respect to the traveling direction of the magnetic recording medium when the magnetic head is used and built into the cylindrical body 1 made of a non-magnetic material. The side magnetic pole l1 is configured such that its surface occupies a position retracted from the tip of the central magnetic pole 10 by a distance d relative to the surfaces of the central magnetic pole IO and other side magnetic poles 12. FIG. 4 shows that the side magnetic pole 1l of the E-type core of a magnetic head for generating a bias magnetic field for transfer configured using the E-type core shown in FIG. 1 (not shown in FIG. 4) and the rotating roller 6, which forms a pressure crimp between the magnetic surface of the recorded magnetic recording medium and the magnetic surface of the unrecorded magnetic recording medium. Within two magnetic gaps 16.17 formed between the central magnetic pole lO and the two side magnetic poles 11.12, the magnetic recording A state in which the object 16 at the front with respect to the traveling direction of the medium occupies a position close to the center position P of the pressure contact area 9 formed by the above-mentioned cylindrical body l made of a non-magnetic material and the rotating roller 6. An embodiment of the magnetically recorded information copying apparatus of the present invention in which the magnetic head for generating the bias magnetic field for transfer is provided in a cylindrical body made of a non-magnetic material is as follows.
FIG. 2 is a diagram illustrating a schematic configuration in a manner similar to the manner of illustration of the embodiment shown in FIG. 1 already described, and a state of the magnetic field strength distribution of a generated perpendicular magnetic field.

The tape pressing area 9 indicated by diagonal lines in FIG. The recorded magnetic recording medium T1 and the unrecorded magnetic recording medium T2, which are sandwiched between the outer peripheral surfaces of This area is formed in a predetermined range around the IMF at the intersection of the line C-C connecting the rotation center of the cylindrical body 1 made of non-magnetic material and the rotation center of the rotating roller 6. ．． In the E-type core of the magnetic head for generating a bias magnetic field for transfer, which is indicated by a broken line in FIG. Its surface occupies a position retracted by a distance 11d from the tip of the central magnetic pole 10, and the two magnetic poles formed between the central magnetic pole 10 and the two side magnetic poles 11. Within the air gap 16.17,
The one L6 at the front with respect to the traveling direction X of the magnetic recording medium is
Center position i of tape pressure contact area 9! Since the magnetic head is installed in the cylindrical body made of non-magnetic material so as to occupy a position close to P, magnetic gaps 16 and 17 occur in the magnetic head built in the cylindrical body 1 made of non-magnetic material. The leaked magnetic flux is transferred to an unrecorded magnetic recording medium T sandwiched between the outer circumferential surface of the cylindrical body l made of a non-magnetic material and the outer circumferential surface of the rotating roller 6.
2 and the recorded magnetic recording medium Tl, including the tape pressure contact area 9, and the non-magnetic elastic material (
The cylindrical body 7 made of a soft magnetic material (for example, M n Z n ferrite > 11) that constitutes the main body of the rotating roller 6 penetrates the coating layer 8 made of, for example, urethane-based high elastic rubber).
After reaching , the non-magnetic elasticity of the surface of the rotating roller 6 is transferred from the cylindrical body 7 (see FIG. 6) made of a soft magnetic material (for example, MnZn ferrite) constituting the main body of the rotating roller 6. The coating layer 8 (see FIG. 6) made of a body material (for example, urethane-based high elastic rubber) and the portion other than the tape pressure contact area 9 of the recorded magnetic recording medium Tl and the unrecorded magnetic recording medium T2 are passed through. Side magnetic pole 11 of magnetic head
, return to 12. As mentioned above, the perpendicular magnetic field generated by the leakage magnetic flux generated in the magnetic air gap 16, 17 of the magnetic head built in the cylindrical body 1 made of non-magnetic material has a magnetic field strength that is equal to the retention of the recorded magnetic recording medium Tl. The magnetic field strength is smaller than the magnetic force and about 2 to 3 times the coercive force of the unrecorded magnetic recording medium T2, and is used as a transfer bias magnetic field. Therefore, in the magnetic recording information copying apparatus, the recorded magnetic recording medium Tl and the unrecorded magnetic recording medium are sandwiched between the outer circumferential surface of the cylindrical body 1 made of a non-magnetic material and the outer circumferential surface of the rotating roller 6. T2 and T2 are brought into close contact with each other with a predetermined pressure required for transferring magnetically recorded information in the tape pressure contact area 9 indicated by diagonal lines in FIG. 4, and placed in a transfer bias magnetic field. As a result, the magnetic recording information on the recorded magnetic recording medium T1 is transferred to the unrecorded magnetic recording medium T2, and the unrecorded magnetic recording medium T2 becomes a recorded copy. A copy of magnetic recording information according to the present invention, in which a magnetic head for generating a bias magnetic field for transfer having an E-shaped core indicated by a broken line in FIG. In the embodiment of the apparatus, the E-shaped core shown in FIG. 2, a part of which is indicated by the broken line downward in FIG. The distribution of the magnetic field strength of the transfer bias magnetic field is determined by the curve shown by the broken line in the characteristic curve example diagram showing the relationship between the position in the running direction X of the magnetic recording medium and the perpendicular magnetic field strength Hy shown in the upper part of FIG. The transfer bias magnetic field generated by the magnetic head for generating the transfer bias magnetic field corresponds to the tape pressure contact area 9 and is shown by the curve (i-+j-4k) indicated by the broken line in the figure. This shows the magnetic field strength distribution. As mentioned above, the recorded magnetic recording medium TI, which has been previously recorded with horizontal magnetization, and the unrecorded magnetic recording medium T2, which is to be recorded with perpendicular magnetization, are brought into close contact with each other, so that the magnetic surfaces of the magnetic recording media are brought into close contact with each other. In this state, the magnetic recording information recorded in the horizontal magnetization recording form on the recorded magnetic recording medium T1 is passed through a bias magnetic field for transfer in the direction X perpendicular to the direction of the magnetic field. In order to successfully transfer magnetic recording information in the form of perpendicular magnetization recording to the unrecorded magnetic recording medium T2. Recorded magnetic recording medium T
The recorded magnetic recording medium Tl and the unrecorded magnetic recording medium T are shown in the tape pressure contact area 9 where the magnetic surfaces of the magnetic recording medium T1 and the unrecorded magnetic recording medium T2 are in close contact with each other.
While the magnetic recording medium Tl is passing through the magnetic recording medium Tl
, T2 is required to follow a course in which the intensity of the bias magnetic field for transfer is finally attenuated to zero, but in one embodiment of the magnetically recorded information copying apparatus of the present invention, The transfer bias magnetic field generated by the magnetic head for generating the transfer bias magnetic field has a magnetic field strength distribution shown at i −+ j → k of the characteristic curve ■ in FIG. 4 corresponding to the tape pressure contact area 9. Therefore, the magnetic recording medium TI,
At the time when T2 leaves the tape pressure contact area 9, a magnetic field with a large magnetic field strength is not applied to the magnetic recording media Tl and T2, and transfer recording is performed on the magnetic recording medium T2 in a good condition. Further, even after the magnetic recording media Tl and T2 leave the tape pressure contact area 9, they pass through the magnetic field strength part shown by the k+a part of the curve 2 shown by the broken line shown in the upper part of FIG. The magnetic field strength portion indicated by the k-4n portion of the broken line curve (1) shown above in FIG.
It does not cause significant demagnetization. Next, in the E-shaped core of the magnetic head for generating a bias magnetic field for transcription shown in FIG. A magnetic gap 18 is formed between the central magnetic pole l3 and the side magnetic pole 14.15.
Moreover, there is a magnetic air gap l between the central magnetic pole l3 and the side magnetic pole l5.
9 is formed. In the E-type core shown in FIG.
When one side magnetic pole 14 of the two side magnetic poles 14 and 15 arranged on both sides of the The side magnetic pole 14 located ahead of the central magnetic pole 13 with respect to the traveling direction of the recording medium has a surface of a portion 14b excluding both end portions 14a and 14c in the thickness direction from the surface of the central magnetic pole l3 and other side magnetic poles 15 described above. is configured such that it occupies a position retracted from the tip of the central magnetic pole 13 by a distance d. FIG. 5 shows that the side magnetic pole l4 in the E-type core of a magnetic head for generating a bias magnetic field for transfer configured using the E-type core shown in FIG. 1 (not shown in FIG. 5) and a rotating roller 6, the pressure contact area is formed between the magnetic surface of the recorded magnetic recording medium and the magnetic surface of the unrecorded magnetic recording medium. A magnetic recording medium is placed within two magnetic gaps 18.19 formed between the central magnetic pole l3 and the two side magnetic poles 14.15 so as to occupy positions spaced apart in a direction perpendicular to the plane of the magnetic recording medium 9. The front object 18 in the direction of movement is at the center of the pressure contact area 9 formed by the above-mentioned cylindrical body l made of non-magnetic material and the rotating roller 6! ! An embodiment of the magnetically recorded information copying apparatus of the present invention, in which the magnetic head for generating a bias magnetic field for transfer is provided in a cylindrical body made of a non-magnetic material so as to occupy a position close to P. , is a diagram showing a schematic configuration in a manner similar to that of the embodiment shown in FIGS. 1 and 4 already described, and a state of the magnetic field strength distribution of the generated perpendicular magnetic field. ．． The tape pressing area 9 shown with diagonal lines in FIG. The recorded magnetic recording medium TI and the unrecorded magnetic recording medium T2, which are sandwiched between the outer peripheral surfaces of It is an area connecting the rotation center of the cylindrical body 1 made of non-magnetic material and the rotation center of the rotating roller 6.
It is formed in a predetermined range centered at the intersection point @p. In the E-type core of the magnetic head for generating a bias magnetic field for transfer, which is shown by the two-dot chain line and the broken line in FIG. In the side magnetic pole 14 located further forward than the center magnetic pole 14, the surface of the portion 14b excluding both ends 14a and 14c in the thickness direction is closer to the tip of the center magnetic pole 13 by a distance d than the surface of the central magnetic pole 13 and other side magnetic poles 15. The structure is such that it occupies a position that is more recessed than the rest. In addition, the central magnetic pole 13 and the two side magnetic tails 4,
Two magnetic gaps i8 and 19 formed between
Among them, the one 18 at the front in the traveling direction X of the magnetic recording medium is located at the center l! of the tape pressure contact area 9! Since the magnetic head is installed in the cylindrical body made of non-magnetic material so as to occupy a position close to P, magnetic gaps 18 and 19 occur in the magnetic head built in the cylindrical body 1 made of non-magnetic material. The leakage magnetic flux is caused by the tape of the unrecorded magnetic recording medium T2 and the recorded magnetic recording medium TI sandwiched between the outer circumferential surface of the cylindrical body 1 made of a non-magnetic material and the outer circumferential surface of the rotating roller 6. A coating layer 8 made of a non-magnetic elastic material (for example, urethane-based high elastic rubber) on the surface of the rotating roller 6 and the area including the pressure contact area 9.
After reaching the cylindrical body 7 of soft magnetic material (for example, MnZn ferrite) II that constitutes the main body of the rotating roller 6, the main body of the rotating roller 6 is From the cylindrical body 7 (see FIG. 6) made of a soft magnetic material (for example, MnZn ferrite) to the non-magnetic elastic material (for example, urethane-based high elastic rubber) on the surface of the rotating roller 6. It returns to the side magnetic pole 14, 15 of the magnetic head by passing through the coating layer 8 (see FIG. 6) made of the same material, and the portion of the recorded magnetic recording medium Tl and the unrecorded magnetic recording medium T2 other than the tape pressure contact area 9. As mentioned above, the perpendicular magnetic field generated by the leakage magnetic flux generated in the magnetic air gap 18, 19 of the magnetic head built in the cylindrical body 1 made of non-magnetic material has a magnetic field strength that is equal to the retention of the recorded magnetic recording medium Tl. The magnetic field strength is smaller than the magnetic force and about 2 to 3 times the coercive force of the unrecorded magnetic recording medium T2, and is used as a transfer bias magnetic field. Therefore, in the magnetic recording information copying apparatus, the recorded magnetic recording medium T1 and the unrecorded magnetic recording medium are sandwiched between the outer circumferential surface of the cylindrical body 1 made of a non-magnetic material and the outer circumferential surface of the rotating roller 6. T2 and T2 are brought into close contact with each other at a predetermined pressure required for transferring magnetically recorded information in the tape pressure contact area 9 indicated by diagonal lines in FIG. 5, and placed in a transfer bias magnetic field. By passing through the magnetic recording medium T1, the magnetic recording information on the recorded magnetic recording medium T1 is transferred to the unrecorded magnetic recording medium T2, and the unrecorded magnetic recording medium T2 becomes a recorded copy. The magnetic head of the present invention has a magnetic head for generating a transfer bias magnetic field having an E-shaped core shown by a two-dot chain line and a broken line in FIG. In the embodiment of the recorded information copying apparatus, since the E-type core shown in FIG. 3, a part of which is shown by the two-dot chain line and the broken line downward in FIG. 5, is used, this transfer bias magnetic field is The distribution of the magnetic field strength of the transfer bias magnetic field generated by the generation magnetic head has a characteristic showing the relationship between the position in the running direction X of the magnetic recording medium and the perpendicular magnetic field strength Hy shown in the upper part of FIG. The curve ■ is shown by the dashed-dotted line in the curve example diagram, and the transfer bias magnetic field generated by the magnetic head for generating the bias magnetic field for transfer corresponds to the tape pressure contact area 9 as shown by the dashed-dotted line in the diagram. This shows the magnetic field strength distribution shown from m to n of the curve ■. As mentioned above, the recorded magnetic recording medium Tl, which has been previously recorded with horizontal magnetization, and the unrecorded magnetic recording medium T2, which is to be recorded with perpendicular magnetization, are brought into close contact with each other, so that the magnetic surfaces of each magnetic recording medium are brought into close contact with each other. In this state, the magnetic recording information recorded in the horizontal magnetization recording form on the recorded magnetic recording medium TI is passed through a bias magnetic field for transfer in the direction X perpendicular to the direction of the magnetic field, and the unrecorded magnetic information is In order to successfully transfer the magnetic recording information in the perpendicular magnetization recording format to the recording medium T2, it is necessary to make sure that the magnetic surfaces of the recorded magnetic recording medium T1 and the unrecorded magnetic recording medium T2 are brought into close contact with each other. While the recorded magnetic recording medium 'Tl and the unrecorded magnetic recording medium T2 are passing through the tape pressure contact area 9, which is in the tape pressure contact area 9, a voltage is applied to both the magnetic recording media TI and T2. It is necessary that the intensity of the bias magnetic field for transfer eventually attenuates to zero, but in one embodiment of the copying device for magnetically recorded information of the present invention, the intensity of the bias magnetic field for transfer is reduced to zero. Since the transfer bias magnetic field generated by the magnetic head has the magnetic field strength distribution shown in characteristic curve 171-Q in FIG. 5 corresponding to the tape pressure contact area 9, magnetic recording Media TI
, T2 leave the tape pressure contact area 9, no magnetic field with a large magnetic field strength is applied to the magnetic recording media Tl, T2, and good transfer is performed on the magnetic recording medium T2. Further, even after the magnetic recording media Tl and T2 leave the tape pressure contact area 9, the magnetic field strength portion shown by the n-40 portion of the curve (2) indicated by the two-dot chain line shown in the upper part of FIG. 5 is maintained. However, i'l in the curve ■ indicated by the chain double-dashed line shown above in FIG.
4. The magnetic field strength part indicated by the Q part has a small magnetic field strength, so the recording media TI and T2 are not significantly demagnetized. 21st! In the E-type core shown in FIG. 1, the surface of the side magnetic pole l1 located in front of the central magnetic pole 10 in the traveling direction X of the magnetic recording medium is similar to the central magnetic pole 13 described above or other It is configured such that it occupies a position retracted from the tip of the central magnetic pole 13 by a distance d from the surface of the side magnetic pole 15, and. In the E-shaped core shown in FIG. 3, the side magnetic poles l4 located in front of the central magnetic pole 13 in the traveling direction X of the magnetic recording medium are located at both ends in the thickness direction. 14
The surface of the portion 14b excluding a and 14c is configured such that it occupies a position retracted from the tip of the central magnetic pole l3 by a distance d from the surfaces of the central magnetic pole 13 and other side magnetic poles 15. The difference between the E-type core shown in FIG. 2 and the E-type core shown in FIG. 3 is that the E-type core shown in FIG. Side magnetic pole 1 located at the front in the traveling direction X of the medium
1, the entire surface of the central pole 13 and the other side magnetic poles l
In contrast, the E-type core shown in FIG. The surface of only the portion 14b excluding both ends 14a and 14c in the thickness direction of the side magnetic pole 14 located ahead of the central magnetic pole 13 in the traveling direction X of the magnetic recording medium from the position of the magnetic pole 13 is the central magnetic pole 13 described above The structure is such that it occupies a position retracted from the tip of the central magnetic pole l3 by a distance 111d from the surface of the other side magnetic pole 15. Due to this difference, the distribution of magnetic resistance in the magnetic circuit is better in the E-type core with the configuration shown in Figure 3, and the characteristic curves ■ in Figure 4 and Figure 5 It appears as a difference from the characteristic curve ■ in the middle. In addition, the shape and characteristic curve of the E-type core are shown by solid lines in each of FIGS. 4 and 5! 6 shows the shape and characteristic curve I of the previously proposed E-type core shown in FIG. 6, which is indicated by a solid line in FIG. 1, for comparison with each embodiment of the present invention. In implementing the magnetically recorded information copying apparatus of the present invention, the magnetic head H for generating a transfer bias magnetic field to be built in the cylindrical body 1 made of a non-magnetic material is replaced with a magnetic head H made of a non-magnetic material. By rotating it within the cylinder 1, the central magnetic pole and 2
In the two magnetic gaps formed between the two side magnetic poles,
A state in which the magnetic recording medium at the front in the traveling direction occupies a position close to the center position 121p of the pressure contact area 9 formed by the above-mentioned sandwiching between the cylindrical body 1 made of a non-magnetic material and the rotating roller 6. The magnetic head for generating the bias magnetic field for transfer may be mounted inside the cylindrical body 1 made of a non-magnetic material. Furthermore, when the present invention is implemented using a magnetic head H for generating a bias magnetic field for transfer in which the E-type core shown in FIGS. 2 and 3 is used, the E-type core is The magnetic head H for generating a bias magnetic field for transfer is turned off so that the center position of the central magnetic pole is near the line C-C@ position connecting the centers of the cylindrical body l made of non-magnetic material and the rotating roller 6. The present invention may be implemented by incorporating it into the cylindrical body 1 made of magnetic material. (Effects of the Invention) As is clear from the above detailed explanation, the present invention has a central magnetic pole and side magnetic poles disposed on both sides of the central magnetic pole with a magnetic gap interposed between the central magnetic pole and the aforementioned central magnetic pole. A cylindrical body made of a non-magnetic material containing a built-in magnetic head for generating a bias magnetic field for transfer, and a cylindrical body made of at least a soft magnetic material. A state in which the magnetic surface of the recorded magnetic recording medium and the magnetic surface of the unrecorded magnetic recording medium face each other in the transfer bias magnetic field generated by the roller and the magnetic head for generating the transfer bias magnetic field. and a means for moving the cylindrical body made of the non-magnetic material and the rotary roller in a state in which they are sandwiched and pressed together; Of the two magnetic gaps formed between the magnetic pole and the two side magnetic poles, the one at the front with respect to the traveling direction of the magnetic recording medium is the one between the above-mentioned cylindrical body made of a non-magnetic material and the above-mentioned rotating roller. The magnetic field for generating the bias magnetic field for transfer is located close to the center position of the pressure contact area between the magnetic surface of the recorded magnetic recording medium and the magnetic surface of the unrecorded magnetic recording medium formed by bonding. A copying apparatus for magnetically recorded information, comprising means for disposing a head in a cylindrical body made of a non-magnetic material. And among the two side magnetic poles in the E-type core of the magnetic head for generating a bias magnetic field for transfer,
The magnetic surface of the recorded magnetic recording medium, which is formed by sandwiching the cylindrical body made of the non-magnetic material and the rotating roller, and the surface of the unrecorded magnetic recording medium in front of the central magnetic pole in the traveling direction of the magnetic recording medium are A central magnetic pole in an E-shaped core of a magnetic head for generating a bias magnetic field for transfer, so as to occupy a position spaced apart from the area in pressure contact with the magnetic surface of the magnetic recording medium in a direction perpendicular to the plane of the pressure area, and for generating a bias magnetic field for transfer. Of the two magnetic gaps formed between the magnetic recording medium and the two side magnetic poles, the one at the front with respect to the traveling direction of the magnetic recording medium is sandwiched between the cylindrical body made of a non-magnetic material and the rotating roller. The magnetic head for generating a bias magnetic field for transfer is positioned close to the center position of the pressure contact area between the magnetic surface of the recorded magnetic recording medium and the magnetic surface of the unrecorded magnetic recording medium to be formed. A magnetic recording information copying device comprising a means provided in a cylindrical body made of a non-magnetic material, and a magnetic head for generating a bias magnetic field for transfer. A recorded magnetic recording medium in which the surface of the portion of the medium in front of the central magnetic pole in the direction of travel, excluding both ends, is formed by being sandwiched between the above-mentioned cylindrical body made of a non-magnetic material and a rotating roller. occupies a position spaced apart in the direction perpendicular to the surface of the pressure contact area with respect to the pressure contact area between the magnetic surface of the magnetic surface and the magnetic surface of the unrecorded magnetic recording medium, and the surfaces of both ends of the side magnetic poles are A position close to the pressure contact area between the magnetic surface of a recorded magnetic recording medium and the magnetic surface of an unrecorded magnetic recording medium, which is formed by sandwiching between a cylindrical body made of a non-magnetic material and a rotating roller. , and
Of the two magnetic gaps formed between the central magnetic pole and two side magnetic poles in the E-shaped core of the magnetic head for generating a bias magnetic field for transfer, the one at the front with respect to the traveling direction of the magnetic recording medium is the non-magnetic gap described above. Occupies a position close to the center of the pressure contact area between the magnetic surface of a recorded magnetic recording medium and the magnetic surface of an unrecorded magnetic recording medium, which is formed by sandwiching a cylindrical body made of a magnetic material and a rotating roller. Since this apparatus is a copying apparatus for magnetically recorded information, it is equipped with means for disposing the magnetic head for generating a bias magnetic field for transfer in a cylindrical body made of a non-magnetic material. In the apparatus, the transfer bias magnetic field generated by the magnetic head for generating the transfer bias magnetic field is reduced in a good decreasing state corresponding to the tape pressure contact area 9, and the magnetic recording medium TI, T2 is reduced. When the magnetic recording media Tl, T2 leave the tape pressure area 9, no magnetic field with a large magnetic field strength is applied. Since the magnetic field is configured to pass through a portion where the magnetic field strength is low even after the magnetic field has been removed, the recording media Tl and T2 are not significantly demagnetized, and the present invention satisfactorily solves the problems of the conventional art described above. be able to.

[Brief explanation of drawings]

FIGS. 1, 4, and 5 show a portion where a bias magnetic field for transfer is generated in a copying apparatus for magnetically recorded information according to different embodiments of the present invention, and a bias for transfer in an already proposed copying apparatus for magnetically recorded information. Figure 2 shows a comparison of the configuration with the magnetic field generation part and a comparison of the magnetic field strength distribution.
3 and 3 are perspective views of an E-type core used in the magnetic head part for generating a bias magnetic field for transfer in the magnetic recording information copying apparatus of the present invention, and FIG. 6 is a perspective view of the previously proposed magnetic recording information FIG. 7 is a plan view of the copying machine shown in FIG. 1... Cylindrical body made of non-magnetic material, 2, 10.13...
・Central magnetic pole. 3, 4, 11, 12, 14, 15, 1 4
a, 14 b, 14 c-side magnetic pole, 5...
- Coil, 6... Rotating roller, 7... Cylindrical body made of soft magnetic material, 8... Covering layer made of non-magnetic elastic material, 1
6-19, gL gL gta g2' ... magnetic gap,

Claims (1)

[Claims] 1. A transfer device comprising an E-shaped core having a central magnetic pole and side magnetic poles arranged on both sides of the central magnetic pole with a magnetic gap interposed between the central magnetic pole and the central magnetic pole. A cylindrical body made of a non-magnetic material with a built-in magnetic head for generating a bias magnetic field, a rotary roller mainly composed of at least a cylindrical body made of a soft magnetic material, and the above-mentioned magnetism for generating a bias magnetic field for transfer. In the transfer bias magnetic field generated by the head, the magnetic surface of the recorded magnetic recording medium and the magnetic surface of the unrecorded magnetic recording medium face each other, and the cylindrical body made of the non-magnetic material is means for moving the magnetic head in a pinched and pressed state with the above-mentioned rotating roller; Of the two magnetic gaps, the one at the front with respect to the traveling direction of the magnetic recording medium is formed by being sandwiched between the above-mentioned cylindrical body made of a non-magnetic material and the above-mentioned rotating roller. Means for installing the magnetic head for generating a bias magnetic field for transfer in a cylindrical body made of a non-magnetic material so as to occupy a position close to the center of a pressure contact area between the surface and the magnetic surface of the unrecorded magnetic recording medium. A copying device 2 for magnetically recorded information, comprising an E-shaped core having a central magnetic pole and side magnetic poles disposed on both sides of the central magnetic pole with a magnetic gap interposed between the central magnetic pole and the central magnetic pole. a cylindrical body made of a non-magnetic material with a built-in magnetic head for generating a bias magnetic field for transfer; a rotary roller mainly composed of at least a cylindrical body made of a soft magnetic material; In a bias magnetic field for transfer generated by a magnetic head for generating a bias magnetic field, the magnetic surface of the recorded magnetic recording medium and the magnetic surface of the unrecorded magnetic recording medium face each other, and the non-magnetic material is Among the two side magnetic poles of the E-shaped core of the magnetic head for generating a bias magnetic field for transfer, The magnetic surface of the recorded magnetic recording medium, which is formed by sandwiching the cylindrical body made of the non-magnetic material and the rotating roller, and the surface of the unrecorded magnetic recording medium in front of the central magnetic pole in the traveling direction of the magnetic recording medium are so as to occupy a position spaced from the pressure contact area with the magnetic surface of the magnetic recording medium in a direction perpendicular to the plane of the pressure contact area;
Of the two magnetic gaps formed between the central magnetic pole and the two side magnetic poles in the E-shaped core of the magnetic head for generating a bias magnetic field for transfer, the one at the front with respect to the traveling direction of the magnetic recording medium is the one described above. A position close to the center of the pressure contact area between the magnetic surface of a recorded magnetic recording medium and the magnetic surface of an unrecorded magnetic recording medium, which is formed by sandwiching between a cylindrical body made of a non-magnetic material and a rotating roller. A copying apparatus 3 for magnetically recorded information comprising means for disposing the magnetic head for generating a bias magnetic field for transfer in a cylindrical body made of a non-magnetic material so as to occupy a central magnetic pole; A cylinder made of a non-magnetic material and containing a magnetic head for generating a bias magnetic field for transcription, which includes an E-shaped core having side magnetic poles arranged on both sides of a central magnetic pole with a magnetic gap in between. A rotating roller mainly composed of at least a cylindrical body made of a soft magnetic material, and a magnetic recording medium that has already been recorded in a transfer bias magnetic field generated by the above-mentioned magnetic head for generating a transfer bias magnetic field. The magnetic surface of the medium and the magnetic surface of the unrecorded magnetic recording medium are moved in a state where they face each other and are sandwiched and pressed between the cylindrical body made of the non-magnetic material and the rotating roller described above. of the two side magnetic poles in the E-shaped core of the magnetic head for generating a bias magnetic field for transfer, excluding both ends in the thickness direction of the one forward of the central magnetic pole with respect to the traveling direction of the magnetic recording medium. For a pressure contact area between a magnetic surface of a recorded magnetic recording medium and a magnetic surface of an unrecorded magnetic recording medium, the surface of which is formed by sandwiching between the above-mentioned cylindrical body made of a non-magnetic material and a rotating roller. occupies a position spaced apart in a direction perpendicular to the surface of the pressure contact area, and the surfaces of both ends of the side magnetic pole are formed by sandwiching the cylindrical body made of the non-magnetic material and the rotating roller. The center of the E-shaped core of the magnetic head for generating a bias magnetic field for transfer is located close to the pressure contact area between the magnetic surface of a recorded magnetic recording medium and the magnetic surface of an unrecorded magnetic recording medium, and is used for generating a bias magnetic field for transfer. Of the two magnetic gaps formed between the magnetic pole and the two side magnetic poles, the one at the front with respect to the traveling direction of the magnetic recording medium is sandwiched between the above-described cylindrical body made of a non-magnetic material and the rotating roller. The magnetic head for generating a bias magnetic field for transfer is positioned close to the center position of the pressure contact area between the magnetic surface of the recorded magnetic recording medium and the magnetic surface of the unrecorded magnetic recording medium to be formed. A copying device for magnetically recorded information, comprising means provided in a cylindrical body made of a non-magnetic material.