JPS6185604A - Magnetic head - Google Patents

Abstract

PURPOSE:To make magnetic recording and reproducing using a high frequency minute level signal possible by attaching a hybridized head amplifier substrate to an exciting pole of a magnetic head and storing the whole of the magnetic head in a shield case. CONSTITUTION:With respect to a head amplifier substrate 50, resistances, transistors, etc. are hybridized and placed on the surface of a rectangular thin plate-shaped substrate 51 consisting of ceramics or the like to constitute a head amplifier circuit, and a coaxial cable 52 for signal is connected to the lower part in the center of the substrate 51, and one line of this cable 52 is connected to a ground terminal 52a, and the other line is connected to an output part terminal 52b. A power supply terminal 53 is provided slightly right in the lower part, and a power source is connected to it. The rear face of this head amplifier 50 is adhered to the front side face of a block 41 by an adhesive, and finally, a winding 44 is shortened as much as possible and has both end parts connected to prescribed positions of the substrate 51. The whole of the magnetic head is stored in a shield case 60. Thus, jumping-in noise is prevented and the input capacity is reduced to reproduce the minute level signal.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a magnetic head, and more particularly to a magnetic head VC that can perform recording and reproduction of minute level signals and further stabilizes the head touch of the magnetic head.

(Prior art) In the magnetic recording/reproducing method, in which the magnetic recording medium is magnetized in the thickness direction of the perpendicular magnetic recording method, the shorter the wavelength of the magnetization magnetically recorded in the M-embedding, the more the above-mentioned magnetic recording It is known that since the self-demagnetizing field within the medium becomes smaller, it is suitable for high-density recording.

K for performing such perpendicular magnetic recording requires a magnetic recording medium having large perpendicular magnetic anisotropy and a magnetic recording head that generates a sharp and strong perpendicular component magnetic field. There are known methods for performing perpendicular magnetic recording, such as an auxiliary magnetic pole excitation type perpendicular magnetic head type and a main pole excitation type perpendicular magnetic head type. .

As shown in FIG. 12, the above-mentioned auxiliary pole excitation type perpendicular magnetic head system consists of a main pole film 1 made of a high permeability magnetic film such as Co-Zr-Nb, and a film such as Mn-Zn, Mn-Zn, etc.
A main magnetic pole 10 to which a magnetic member 1a made of Ni-Zn 7-elite or the like is bonded, and a high magnetic permeability magnetic block 2alC made of 7-elite or the like is an excitation pole around which a winding 2b for transmitting and receiving an information signal current is wound. Auxiliary magnetic pole 2 and predetermined air gap 3
K so that they are arranged facing each other. When performing magnetic recording and reproduction, a magnetic disk 4, which is a disc-shaped magnetic recording medium, is run through the gap 3, and the magnetized film of the magnetic disk 4 is brought into sliding contact with the main pole film 1. There is. The magnetic disk 4 has flexible paces 4a and 4a made of a polymer film, etc.
A high permeability magnetic layer 4b made of Hermalloy or the like is formed, and a perpendicular magnetization layer 4C is formed thereon.

As shown in FIG. 15, in the main pole excitation type perpendicular magnetic head system, a winding 2b for transmitting and receiving information signal i#j is wound around a block in which one magnet 1g1 is held between magnetic members 1a. It constitutes a perpendicular magnetic hect 5 which is an excitation pole. In this case, the magnetic disk 41 is
The applied magnetic field flows through the high permeability magnetic layer 4b and further through the same space as the main pole film 1 to the magnetic member 1aVCR as shown by the arrow in the figure.

On the other hand, in order to perform high-density recording, K inevitably records and reproduces using a high frequency signal, and the signal level of the high frequency signal used is a very low minute level signal. Therefore, unless the noise generated in the U path between the signal detected by the magnetic head and the signal amplifier (amplifier) VC is suppressed as much as possible (referred to as the magnetic head-head amplifier system), this noise will cause the minute level signal t5 is disturbed, and accurate signal transmission becomes impossible. The type of noise mentioned above is the impedance noise generated by the excitation pole winding of the magnetic head.

There are amplifier noises generated in the first stage of the head amplifier and noises generated between the windings and the head amplifier. Since the impedance noise is thermal noise generated from the real part of the impedance of the winding, it is possible to suppress the impedance noise to some extent by reducing the number of turns of the winding and shortening the winding. The above amplifier noise consists of thermal noise generated from the spread base resistance of the first-stage transistor constituting the amplifier and shitt noise generated at the junction of the transistors, so the K that suppresses the amplifier noise is:

A transistor with a small spread base resistance is selected and used as the first stage transistor.

Considering the impedance of the winding, the collector current flowing through this transistor must be set to the optimum collector current to operate the transistor by 5KL. In addition, among the noise generated between the winding and the head amplifier, for example, as shown in Figure @14, one end of the winding 12 wound around the magnetic head 11 is grounded, and the other end is connected to the lead wire 13.
is connected to the input terminal of the head amplifier 14, and the ground terminal of this amplifier 14 is grounded. be. Further, when the lead wire 13 is long, K may be affected by noise coming in from the outside.

Therefore, in order to suppress various noises generated between the winding wire and the head amplifier, a small diameter wire is used for the lead wire 15.
You can use a twisted bare wire made by twisting two wires together as #J, or connect one of the two wires coming out from one end of the two-core shielded wire 15 to the magnetic head as shown in Figure 15. 11 and the other end of the @ wire 12 is connected to VC. 5 of the two wires coming out from the other end of the two-core shielded wire 15.
Then, one end is connected to the input terminal VC of the head amplifier 140, the other end is connected to the ground end of the head amplifier 14, and the shield coating 16 of the shield wire 15 is connected to the ground end of the head amplifier 14, and the whole is grounded. Measures are being taken to: However, such a K has the disadvantage that the spacing between the lines becomes large and the resonant frequency of the magnetic head 11 is lowered.

Furthermore, as shown in FIG. 16, one of the two wires coming out from the two-core shielded wire 15 next to the head amplifier 14 shown in FIG. 15 is connected to the non-inverting input terminal of the head amplifier 17. and the other end is connected to the inverting input terminal of the head amplifier 17, and the shield cover 16 is connected to the ground terminal of the head amplifier 17, and further grounded to the VC ground point. Although it is possible to reduce the above-mentioned intrusion noise by configuring a K, such a K construction also cannot avoid an increase in the line-to-line noise.

Furthermore, when performing high-density magnetic recording and reproducing, the stability of the sliding contact state (referred to as head touch) between the magnetic head and the magnetic disk, which is caused by vibrations of the magnetic disk and the like, becomes a problem. In other words, if the head touch is unstable, information signal dropouts occur, making it impossible to record and reproduce accurate signals. Therefore, it has been proposed to use a disk regulating member as a means for stabilizing the rough contact between the magnetic head and the magnetic disk. For example, in the case of an auxiliary magnetic pole excitation type magnetic head, as shown in FIG. A contact type disc regulating member 152 whose cross-sectional shape is arcuate.
a, 152b so that the arc portion faces the magnetic recording surface 5
Install tC. Then, the magnetic disk 4 is inserted between the main magnetic pole 150 and the auxiliary magnetic pole 151, and the main magnetic pole 1
50 presses this disc 4, and the disc regulating members 152a, 152b and this disc 4
By making contact with the head, the stability of the head touch is ensured and the above-mentioned dropout is prevented. Furthermore, FIG. 18 shows a case where a non-contact type disk regulating member is applied to an auxiliary pole excitation type magnetic head. That is, the main magnetic pole 150 and the auxiliary magnetic pole 151 are arranged to face each other, and trapezoidal non-contact disc regulating members 153a and 153b are attached to both sides of the auxiliary magnetic pole 151. The lower surfaces of these regulating members 153a and 153b are processed to form a tapered surface, and the magnetic disk 4 is connected to the main magnetic pole 150 and these regulating members 153g.

153b, and when the magnetic disk 4 is rotated at high speed, the disk 4 is attracted to the regulating members 153a, 153b by negative pressure, and the relationship between the regulating members 153a, 153b and the magnetic disk 4 is An air layer is formed between them, allowing stable head touch.

Further, when the above-mentioned non-contact disk regulating member is applied to a main pole excitation type magnetic head, the result is as shown in FIG. 19. That is, two trapezoidal disk regulating members 164a having a predetermined taper and having different heights.

Prepare 164b. Then, the main magnetic pole 16 which is the excitation pole
10. Attach the regulating members 164a and 164b to both side surfaces so that the tapered surfaces of the upper end surfaces thereof are inclined in one direction.

Then, when the magnetic disk 4 is brought into sliding contact with the tip of the main magnetic pole 161 and rotated at high speed,
The regulating members 164a and 164b and the magnetic disk 4
Negative pressure is generated between the disks 4 and 4, and the disk 4 is attracted to the disk regulating members 164a and 164b, and an air layer is formed. In this way, the above-mentioned rad touch is improved. Further, the main magnetic pole 16 is inserted between the disk 4 and the main magnetic pole 16.
RFC small plate-shaped felt 163 opposite the tip of 1
If the felt 165 is used to lightly press the disc 4 (51C), the stability of the head touch will be further improved. In addition, if necessary, in order to improve the recording and reproducing sensitivity, the
A magnetic material 162 such as eliteite may be arranged.

Even when the stability of head touch is improved by using the disc regulating member as described above, it is of course desirable to reduce the noise and line spacing as much as possible.

(Objective) An object of the present invention is to provide a magnetic head capable of performing advanced playback using a high frequency minute level signal by suppressing the above-mentioned intrusion noise and various input parts as much as possible. K provides a magnetic head such as the above, which is equipped with a disk regulating member that is useful for improving the stability of head touch.

(Summary) In order to achieve the above object, the present invention involves attaching a head amplifier board on which a hybridized signal processing circuit, etc. is mounted to the excitation pole of one magnetic head, and a winding wound around the excitation pole. It is characterized by making the wiring between the wire and the head amplifier as short as possible, and by housing the entire magnetic head in a shielded case.

Further, the present invention is characterized in that an appropriate disk regulating member is provided near the sliding contact portion between the shielded magnetic head and the magnetic disk as described above.

(Example) Hereinafter, the present invention will be explained based on illustrated embodiments.

FIG. 1 is an external view of a magnetic head showing an embodiment of the present invention. The main pole excitation type magnetic head 50 is as follows.

It is composed of a main magnetic pole 40, which is an excitation pole, a head amplifier board 50, a shield case 60, and K.

First, the main magnetic pole 40 is 5K as shown in FIG. 2(A).
.

It consists of a rectangular parallelepiped with a roof-shaped tip. The K that creates this main pole 40 has a cross-sectional shape of an inverted U at its upper end.
A high permeability magnetic material block made of 7-elite or the like having a letter-shaped groove is prepared. On the other hand, a vertically elongated high magnetic permeability soft magnetic film 43 is formed at the center of one side of a thick plate-shaped non-magnetic substrate 42a by means such as sputtering, and this film 43 is separately prepared on a non-magnetic substrate 42b of the same shape. Create a joint block sandwiched with. Then, this joint block is connected to the inverted U-shaped groove K of the high permeability magnetic block 41.
The soft magnetic M43 is perpendicular to the bottom of the U-shaped groove 5
to be inserted into. After fitting the joining block into the U-shaped groove of the block 41 as described above, the upper parts of both blocks are K-shaped as shown in the figure 5 so that one end surface of the soft magnetic material 1145 is exposed as the top of the ridge of the roof. and polish it into a roof shape. ! After that, a winding 44 for detecting an information signal is wound around the central protrusion of the inverted U-shaped groove by an appropriate means, thereby obtaining the main magnetic pole 40 described above.

In addition, as shown in FIG. 2 (CB), the bed amplifier board 50 has a head amplifier circuit ( A coaxial cable 52 for signal output is connected to the lower center of the board 51, one wire of this cable 52 is connected to the ground terminal 52aK, and the other wire is connected to the output terminal 52b.
Connect K. Similarly, a VC power terminal 53 is provided from the bottom and slightly to the right, and a source line is connected to the terminal. Then, the back surface of the head amplifier board 50 configured in this way is glued to the front side of the block 410 (in FIG. 2(B)) with an appropriate adhesive, and the windings 144 are made as short as possible. In this way, both ends are connected to ICs at predetermined positions in the upper center of the substrate 51, respectively.

Further, the shield case 60 (see FIG. 1) is formed of a thin plate of copper, permalloy, aluminum, etc. into a box shape, and the upper surface (in FIG. 1) has a small square hole 40a. The main magnetic pole head 40 is attached so that the head tip thereof is exposed above the small hole 40a. The bottom surface of the shield case 60 is also covered with aluminum or the like similar to the other surfaces, and appropriate small holes are provided so that the above-mentioned coaxial cable 52 and power line can be pulled out. Note that the ground line of the head amplifier circuit is connected to the shield case 60tL.

The magnetic head 30 is constructed as described above.

On the other hand, the head amplifier circuit has a configuration of 5 as shown in FIG. That is, the magnetic block 41 of the magnetic head 30
One end of the K-wound winding 44 is connected to one end of a coupling capacitor 61 for DC blocking, and the other end of the capacitor 61 is connected to the base of an NPN transistor 62 whose emitter is grounded. It is connected to the connection point between bias resistors 63 and 64. The other end of the winding 44 and the other end of the resistor 64 are connected to a ground line AoK. The emitter of the transistor 62 is connected to one end of each of an emitter resistor 65 and a bypass capacitor 66 to VC,
The other ends of the resistor 65 and capacitor 66 are connected to the ground line 1oVC. The collector of the transistor 62 acts as an emitter follower (
It is connected to the emitter of an NPN transistor 67, the collector of the transistor 67 is connected to one end of a load resistor 68 of this transistor 67, and the other end of this resistor 68 is connected to the other end of the bias resistor 63, Furthermore, a power line 2IIC is connected. Further, the collector of the transistor 67 is connected to N which forms the emitter 7 lower.
The base of the PN type transistor 690 is connected to the base of the transistor 670, and the base of the transistor 670 is connected to one end of the bias resistor 70.71 of the transistor 67.
The other ends of 71 are connected to the power supply line and the ground line at -13°, respectively. The above transistor 67
The base is connected to one end of the bypass capacitor 72, and the #! of the capacitor 72 is connected to one end. The end is the ground line 1oV
It is connected. The collector of the transistor 69 is.

The power supply line A is connected to VC, and the emitter of the transistor 69 is connected to the center conductor 52c of the °C coaxial cable 52 via a coupling capacitor 73 for DC blocking and a resistor 74 for determining output impedance.

The outer conductor 52d of this cable 52 is the ground line 1
oVC is connected. Further, the emitter of the transistor 69 is connected to the ground line 13oIIC via an emitter resistor 75. This 5Fc constitutes the head amplifier circuit, and furthermore, the transistor 62.6
By selecting and employing a transistor with the characteristics of low noise figure, low input capacitance, and high gain bandwidth product as 7 and operating it at the JIJ operating point. It becomes possible.

In addition, if a head amplifier circuit with high input impedance is required, 5K as shown in Figure 4 is required.

A circuit configuration using a field effect transistor (FET) as an input circuit may be used. That is, the input circuit is connected to the magnetic head 30.
The magnetic block 41 includes a DC blocking coupling capacitor 81, bias resistors 82, 83, a bypass capacitor 85, and a field effect transistor 86. The output section includes an NPN transistor 87 that is grounded, an NPN transistor 93 that serves as an emitter 7 lower, a source resistor 88 of the field effect transistor 86, and a bypass capacitor 8.
9. Furthermore, the bias resistor 91 of the transistor 87
．． 92 and the load resistance 90 of the same transistor 87. Bypass capacitor 94 of the resistor 92 and the transistor 93
It is composed of an emitter resistor 95, a coupling capacitor 96, a resistor 97, and K.
lC is connected to the center conductor 52c of the coaxial couple 52,
The outer conductor 52d of this cable 52 is connected to the ground line Ic. Here, the input impedance of this head amplifier circuit is determined by the value of the resistor 86, and the output impedance is determined by the value of the resistor 97. Then, as the above field effect transistor 86, it has a low noise figure and low input capacitance.

If a high transconductance device is used and operated at the optimum operating point, it will have low noise, can be applied to wideband signals, and can be operated as a high input impedance head amplifier circuit.

Further, a step-up transformer 200 as shown in FIG. 11 can be installed between the magnetic block 41 of the magnetic head 60 and the input section of the head amplifier circuit.

Here, in the transformer 200, a primary 111Nc winding 202 of a 7×2 dual core 201 is wound, and a secondary winding 203 is similarly wound. Then, 1N 202 above is the magnetic block 41.
Volume 111j wrapped in! It is FC connected and the winding 203 is connected to the input of the head amplifier circuit. Volume I of these volumes i 202, 203
If the number of IJs is "11" and "2", then there is a relationship of n, (n2, and the output of the magnetic head 3o is 200 mm between the magnetic block 41 of the magnetic head 30 and the input stage of the magnetic head amplifier. By connecting and matching the optimal signal source resistance of the first stage transistor of this input stage, it is possible to reduce noise and step up the output of the magnetic head, which is effective in improving the power ratio.In other words, the above-mentioned By attaching the step-up transformer 200 to the head amplifier board 51 (see FIG. 2 CB),
It becomes possible to configure a small head amplifier with a good /N ratio.

Furthermore, the present invention can also be applied to an auxiliary pole excitation type magnetic head. FIG. 5 is an external view showing an example of an auxiliary magnetic pole of an auxiliary magnetic pole excitation type magnetic head to which the present invention is applied. This auxiliary magnetic pole 100 includes an auxiliary magnetic pole head 110 which is an excitation pole, a head amplifier board 120, and a shield case 13.
0. The above auxiliary magnetic pole head 110
As shown in FIG. 6(A)K, the tip of the prismatic ferrite block 111 is formed into a thin prismatic column 111a,
The upper and lower ends 1c of this prism 111a are square thin plate-shaped 72-inch plates 112a, 1 made of non-magnetic material such as crystallized glass.
12b respectively. The @fffi11s for transmitting and receiving information signals is wound around the space formed by these seven lunges 112a1112b. Further, as shown in FIG. 6(B), the head amplifier board 120 is a rectangular thin plate made of ceramic or the like, and a hybrid recording/reproducing switching circuit and a head amplifier circuit are mounted on the head amplifier board 121. It is arranged. Then, the back side of this head amplifier board 120 is attached to the auxiliary magnetic pole head 11.
00 on the front side surface (in FIG. 6(A)) using an appropriate adhesive, and connect both ends of the winding 1130 to the connection part provided at the center of the upper end of the head amplifier board 120 using a comb as short as possible. do. In addition, the head amplifier board 1
A recording amplifier input terminal 122 and control signal input terminals 123 and 124 of the recording switching circuit are provided at the upper right end of the recording switch 20 .

Similarly, a power input terminal 125 is located below the right end of the board 120.
However, on the left side of this input terminal 125, there is a coaxial cable 1
An output terminal 126a for connecting the 26 center conductors and a ground terminal 126b for connecting the outer conductor of the coaxial cable are provided. The auxiliary magnetic pole head 110 to which the head amplifier board 120 configured in this way is attached,
A shield case 13 similar to the shield case 60 in the main pole excitation type magnetic head shown in FIG.
Store it in 0. Note that the upper surface K of this shield case 130 (in FIG. 5) is provided with a square small hole, through which the top of the auxiliary magnetic pole head 1100 is exposed (5), and the shield case 130 is Various terminals 12 of the head amplifier board 120 are located on the right side of the case 130.
Lead wire 122a connected to 2゜125.124
, 125g.

Three small holes are provided for the 1248 to be pushed through. Further, the bottom surface of the shield case 130 is also covered with aluminum or the like, and a small hole is provided in the bottom surface through which the lead wires of the center conductor and the outer conductor of the coaxial cable 126 are inserted, and are connected to the power terminal 125. A small hole is also provided for passing the lead wire 125a.

Further, the ground terminal 126b is connected to the shield case 13.
0 by a lead wire.

On the other hand, the upper recording re-switching circuit is constructed as shown in FIG. That is, one end of the winding 41b of the magnetic block 41a of the recording/reproducing magnetic head is connected to the NPN transistor 1.
It is connected to the collector KM of 31, and is further connected to a terminal 132 connected to the output end of a recording amplifier (not shown). The base of the above transistor 1310 is the resistor 13
3 is connected to a terminal 140 to which a recording/reproduction control signal from the head amplifier circuit is input, and is connected to the emitter of the same transistor 151 via a resistor 134. Also, this transistor 13
The emitter of 1 is the ground line! 2Vc is connected.

The other end of the winding 41b is connected to an NPN transistor 13.
5 and a terminal 166 for outputting a reproduction signal to the head amplifier circuit. The base of the transistor 135 is connected via a resistor 137 to an input terminal 138 for a recording/reproduction control signal, and the base is also connected via a resistor 139 to the ground line e2.

Next, the operation of the recording re-switching circuit having such an IC configuration will be explained. First, assuming that the control signal input to the terminal 140 is at L level and the control signal input to the terminal 138VC is at H level, the transistor 131 is turned off (non-conducting) and the transistor 135 is turned on (conducting). ) state. Therefore, the connection between the terminal 132 and the ground is open, and the connection between the terminal 136 and the ground is short-circuited, so that the input signal to the magnetic block 41a of the magnetic head is conducted, that is, the recording mode is established. Conversely, when the control signal input to the terminal 140 is at H level, the control signal input to the terminal 138 is
When the signal to the transistor 131 becomes L level, the transistor 131
is turned on, and the transistor 135 is turned off. Therefore, the terminal 132 and the ground are short-circuited, and the terminal 136 and the ground are open, so that the signal detected by the magnetic block 41b is sent to the terminal 136, that is, the reproduction mode is established. When such a recording/reproducing switching circuit is applied to a high-frequency signal used in a perpendicular magnetic recording/reproducing system, it is necessary to use transistors with low ionic resistance and low input capacitance. . Note that the above recording reswitching circuit may be used not only for the auxiliary pole excitation type magnetic head but also for the above-mentioned main pole excitation type magnetic head.

In this embodiment, a magnetic disk is used as the magnetic recording medium, but a tape-shaped magnetic recording medium may also be used.

Next, a case where the present invention is applied to a magnetic head using the disk regulating member in each column in order to improve the stability of the flat touch of various magnetic heads with respect to the 5-sized magnetic disk 4 shown in FIGS. 17 to 19. Another embodiment will be explained based on the drawings.

FIGS. 8(A) and 8(B) are side views of the case where the present invention is applied to the auxiliary magnetic pole excitation type magnetic head having the contact type disk regulating member shown in FIG. It is a perspective view of a magnetic pole.

The auxiliary magnetic pole 100 (see FIG. 5) of the auxiliary magnetic pole excitation type magnetic head described above is prepared, and as shown in FIGS. The surface exposed from the surface (Fig. 8 (A)
, Disk regulating members 171a and 171b made of glass carbon or the like and having a long and thin semi-cylindrical shape with a length of approximately half the length of one side of the shield case are attached to arcuate portions at both left and right ends of the lower surface (in (B)) so as to sandwich the exposed surface. Attach it so that it faces downward. This glassy carbon is highly slippery and has electrical conductivity. Disk regulating member 171a as described above.

When the auxiliary magnetic pole 170 to which the magnetic disk 171b is attached is placed opposite the main magnetic pole 150 at a predetermined position with the magnetic disk 4 in between, and the disk 4 is rotated at high speed, the recording signal drops as in the case shown in FIG. In addition to being able to prevent output noise, it is also possible to prevent jump noise and reduce input protrusion. Sara K.

As mentioned above, since glassy carbon is conductive, it can also release static electricity generated by friction between the disk regulating member and the magnetic disk.

Further, still another embodiment in which the present invention is applied to an auxiliary pole excitation type magnetic head using a non-contact disk regulating member as shown in FIG. 18 will be described with reference to the drawings.

Figure 9 (A), (B) shows 5K.

Prepare the auxiliary magnetic pole 100 shown in FIG. 5, and attach it to the bottom surface of this auxiliary magnetic pole 100 (FIGS. 9 (A) and (B)).

These members 181a are plate-shaped disk regulating members 181a and 181b made of non-magnetic metal or the like and having a taper that is about half the length of the shield case and about 1/3 the width of the shield case.
, 181b are mounted so that their thinner end surfaces are inside each other and sandwich the top of the magnetic head. Auxiliary magnetic pole 180 to which disk regulating members 181a and 181b having the tapered shape of 5 are attached
When the magnetic disk 4 is placed between the magnetic disk 4 and the main magnetic pole 150 at a predetermined position facing each other, and the magnetic disk 4 is rotated at a high speed, the lower surface of the magnetic head 180 and the ridges are formed as in the case shown in FIG. Since an air layer is formed between the main magnetic pole 150 and the magnetic disk 4, and the tip of the main magnetic pole 150 and the magnetic disk 4 are in close contact with each other, the head touch is good and there is no dropout. In addition, it is possible to prevent jump noise and reduce input capacitance.

Further, FIGS. 10(A) and 10(A) show another embodiment in which the present invention is applied to a main pole excitation type magnetic head using a non-contact disk regulating member as shown in FIG. 19. B
) K-based explanation. Figure 10(A).

(B) As shown in K 51C, the main pole excitation type magnetic head 30 (see Figure 1) is prepared, and the main pole 40 is sandwiched on the upper surface of this magnetic head 30 where the tip of the main pole 40 is rounded. Then, on the left and right sides, there is a first disk regulating plate 191a having a length equal to one side of the shield case of the head 30, a width approximately half, and a gentle taper, and a first disk regulating plate 191a having the same vertical and horizontal dimensions as this regulating plate 191a. , the second regulating plate 191b is slightly thicker than the regulating plate 191a and has a slightly steeper taper. At the time of this installation, the above-mentioned regulation plate 19
1b is placed on the right side (in the 10th position), and the thin end surface of this regulating plate 191b is connected to the main pole film 4 of the main pole 40.
3 and so that the end face and the main magnetic pole film 43 are parallel to each other, and similarly, the regulating plate 191a is placed on the left side, and the thicker end face of the regulating plate 191a is attached to the main magnetic pole. Attach it parallel to the membrane 46. When the magnetic disk 4 is placed in a predetermined position with respect to the main pole excitation type magnetic head 1901C having the disk regulating plates 191a and 19jb having the K shape, and the disk 4 is rotated at high speed, the disk 4 and the disk regulating plate are rotated at high speed. Board 191a.

An air layer is formed between the head and the head 191b, and a stable head touch can be obtained. Further, as in FIG. 19, the tip of the main pole 40 is located at a position opposite to the felt 163 or the magnetic body 162 with the magnetic disk 4 interposed therebetween.
By distributing power, you can improve the stability of head touch,
Recording and reproducing sensitivity can be improved. At the same time, it is possible to prevent jump noise and reduce input capacitance.

(Effects) According to the present invention, by housing the hybrid head amplifier board and the excitation pole in a shield case, it is possible to prevent jump noise, and the input capacitance can be extremely reduced by ℃. Therefore, it is possible to process minute level signals.

Furthermore, by attaching a disk regulating plate to the magnetic head of the above invention, in addition to the effects of the above invention.

This is a magnetic head with excellent head touch stability.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a main pole excitation type magnetic head showing one embodiment of the present invention, and FIGS. Figures 3 and 4 are perspective views showing the main magnetic pole and the state in which the head amplifier board is attached to the main magnetic pole, respectively. Figures 3 and 4 each show an example of the head amplifier circuit housed in the magnetic head shown in Figure 1 above. Electrical circuit diagram. FIG. 5 is a perspective view of an auxiliary pole excitation type magnetic head showing another embodiment of the present invention. Figure 7 is a perspective view showing the auxiliary magnetic pole and the head amplifier board facing the auxiliary magnetic pole. FIGS. 8(A) and 8(B) are side views showing an auxiliary pole excitation type magnetic head having a contact type disk regulating member showing another embodiment of the present invention. 9(A) and CB) are perspective views showing the auxiliary magnetic pole of the auxiliary magnetic pole excitation type magnetic head, and FIGS. A side view showing an excitation type magnetic head and a perspective view showing an auxiliary magnetic pole of the excitation type magnetic head, and FIGS. FIG. 11 is a side view and a perspective view showing a main pole excitation type magnetic head having a disk standard Iv1 member of FIG. Schematic diagram showing a transformer. Figures 12 and 13 are cross-sectional views of the main parts of a conventional auxiliary pole-excited magnetic head and a main pole-excited magnetic head. Figure 14 shows a conventional winding-head amplifier system in which a potential difference is generated by the ground point. Figures 15 and 16 are electrical circuit diagrams of a Rad amplifier system to explain this. FIG. 17 is a cross-sectional side view showing an example of an auxiliary pole-excited magnetic head having a conventional contact-type disk regulating member, and FIG. 18 is a cross-sectional side view of a conventional non-contact disk regulating FIG. 19 is a cross-sectional side view showing an example of an auxiliary pole-excited magnetic head having a regulating member; FIG. 19 shows another example of a main pole-exciting magnetic head having a conventional non-contact disk regulating member. 4 is a side view showing a main part in cross section. 4...Magnetic disk 5...Vertical magnetic head (excitation pole) 30.
190... Main pole excitation type magnetic head 40.161.
...Main magnetic pole (excitation brush) 50.120...Head amplifier board 60.130----Shield case 100.1510φ・Auxiliary magnetic pole 110...Auxiliary magnetic pole head (excitation pole) 171
a, 171b, 181a, 181b, 191a, 19
1b・・・・・・・・・Disc regulation member ¥”, 1
Ward horse 2 drawing L3 drawing I h7 drawing 38 ward 9th ward 10 ward'& Z 14 ward horse 15 factor R16 drawing 17 ward strategy 19 drawing

Claims (2)

[Claims] (1) In a magnetic recording and reproducing device, an excitation pole of a magnetic head used for recording and/or reproduction, a head amplifier board having an amplifier circuit, etc. that amplifies a minute level signal detected from the excitation pole, the magnetic head, A shield case that covers a head amplifier board, etc. to prevent the intrusion of various noises, etc., and the excitation pole and the head amplifier board are arranged integrally or close to each other and housed in the shield case. magnetic head. (2) In a magnetic recording and reproducing device, an excitation pole of a magnetic head used for recording and/or reproduction, and a head amplifier board having an amplifier circuit and the like for amplifying a minute level signal detected from the excitation pole; the magnetic head; A shield case that covers the head amplifier board, etc. to prevent the intrusion of various noises, etc., and a disk regulating member to stabilize the pressing force of the magnetic head against the magnetic recording medium. A magnetic head comprising: arranged integrally or close to each other and housed in the shield case, and the disk regulating member is attached to the shield case.