JPH0443327B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a transfer method and apparatus for transferring recorded signals from a recorded master recording medium to a copy recording medium by contact magnetic transfer or thermomagnetic transfer. be.

BACKGROUND ART Conventionally, as a sheet-like magnetic recording medium, printing or documents are written on the surface of a paper or plastic base, a magnetic material is provided on the back side, and audio or digital information related to the writing or printing on the front side is recorded. Some are recorded and used primarily as audiovisual educational media.

The recording tracks of such sheet-like magnetic recording media are mainly spiral or concentric. Conventionally, a contact magnetic transfer method or a thermomagnetic transfer method has been used to reproduce a large amount of recorded copy sheets in such a sheet-like magnetic recording medium, but the former contact magnetic transfer method is generally used. is often used. Therefore, although the isothermal contact magnetic transfer method will be explained as an example, the isothermal contact magnetic transfer method itself is disclosed in Japanese Utility Model Publication No. 19363/1983 by the present applicant. Since this technique is well known to those skilled in the art, it will not be described in detail here.

Various transfer methods and devices have been proposed for the above-mentioned sheet-like magnetic recording medium, including a recorded master magnetic recording medium (hereinafter referred to as a master sheet) and a copy magnetic recording medium (hereinafter referred to as a copy sheet). Apparatuses based on two methods have been proposed and put into practical use, which are roughly classified according to the method of adhesion (referred to as .

As an example of a conventional transfer device using a plane pressure method, as schematically illustrated in FIG. 4 of the accompanying drawings, a master sheet a and a copy sheet b are stacked so that their magnetic surfaces are in contact with each other, and are placed on a sheet plate d. The master sheet and the copy sheet are brought into close contact with each other by an elastic flat pressure contact plate c, and a transfer bias is applied thereto by a transfer bias generating coil e to perform transfer.

As an example of a conventional transfer device using a roll pressure method, as schematically shown in FIG. 5 of the accompanying drawings, a master sheet a and a coil sheet b are pressed together with a sheet plate d by pressure rollers f, g, and h. As the pressure roller f rotates and the sheet plate d moves, the recording signal on the master sheet is transferred to the entire surface of the unrecorded copy sheet.

Problems to be Solved by the Invention In the transfer device using the conventional plane pressure contact method described above, since the master sheet and copy sheet are brought into close contact with each other by plane pressure, the entire surface of the sheet can be brought into close contact at the same time, and the recording track is spiral-shaped. Or, if they are concentric, transfer bias can be applied in the track recording direction, that is, in the circumferential direction, resulting in good transfer efficiency and uniform transfer output all around the track. It has the advantage of relatively little track deviation and good transfer workability. However, in order to bring the master sheet and copy sheet into sufficient contact with each other using this method, experimentally, a pressure of 3 to 5 kg/ ^cm2 is required, and if the recording area is large, a total pressure of several tons is required. The equipment becomes large-scale,
When the surface smoothness of the master sheet and the copy sheet is good, there is a drawback that minute air is likely to be trapped between the master sheet and the copy sheet, resulting in poor adhesion in this area and a decrease in the level of transfer output.

In addition, in the transfer device using the conventional roll pressure contact method described above, the master sheet and copy sheet are brought into close contact with each other by linear pressure, so there is a small probability that air will be trapped in the contact area as in the flat pressure method. Since the transfer bias is applied only in one direction, if the recording track is recorded in a circular shape, due to the transfer efficiency, the direction of the transfer bias magnetic field and the direction of the recording track are in the same direction. In areas where the output level is high and the direction of the transfer bias magnetic field is perpendicular to the direction of the recording track, the transfer output level will be low and the output level over one revolution will be uneven, and the master There was a drawback that track misalignment was likely to occur because the sheet and copy sheet were squeezed.

In view of such prior art, it is an object of the present invention to maintain good adhesion between a master sheet and a copy sheet, and to greatly improve track misalignment between the master sheet and copy sheet due to pressurized adhesion. An object of the present invention is to provide a transfer method and apparatus with excellent transfer workability.

Means and Effects for Solving the Problems According to the present invention, in a transfer method for transferring recording signals from a master sheet to a copy sheet by contact magnetic transfer or thermomagnetic transfer, the master sheet and the copy sheet The air existing between the master sheet and the copy sheet is reduced by reducing the pressure in a state in which the contact area between the master sheet and the copy sheet is not brought into close contact with the master sheet, and in the reduced pressure state, the contact area is brought into close contact with the master sheet under pressure. This eliminates this problem, maintains good adhesion even with weak adhesion pressure, and ensures good transfer.

Further, in a transfer device for transferring recording signals from a master sheet to a copy sheet by contact magnetic transfer or thermomagnetic transfer, according to the present invention, the master sheet and the copy sheet are positioned in a superimposed state. a sheet plate for supporting, a pressurizing contact plate for bringing the contact portions of the master sheet and the copy sheet supported on the sheet plate into close contact with each other under pressure on a plane, and the master sheet on the sheet plate. a decompression mechanism that surrounds the contact area with the copy sheet and creates a reduced pressure state in the contact area before the planar pressure contact by the pressure contact plate and maintains the reduced pressure state during the planar pressure contact. By this, the air existing between the master sheet and the copy sheet is removed by reducing the pressure only in the area where the master sheet and the copy sheet are in close contact with each other, and maintaining good adhesion even with a weak contact pressure. Transcription takes place.

Embodiments Next, the present invention will be described in more detail with respect to embodiments of the present invention based on FIGS. 1, 2, and 3 of the accompanying drawings.

FIG. 1 is a diagram schematically showing only a pressurized contact portion of a contact magnetic transfer device as an embodiment of a transfer device for carrying out the transfer method of the present invention. Figures 2 and 3
This figure is a schematic diagram for explaining the operating state of the apparatus shown in FIG. 1. The contact magnetic transfer device shown in FIG. 1 includes a pressure plate 1, which is moved up and down to apply pressure by an air cylinder (not shown) or the like. . A vacuum air packing 2 is provided on the periphery of the lower surface of the pressure plate 1, and a pressure contact plate 3 is provided in the center.
These vacuum air packing 2 and pressurized contact plate 3
It is preferable that both of them be made of an elastic material such as rubber. In this embodiment, the pressure plate 1 has a disk shape, and the vacuum air packing 2 is fixed to the circumference of the pressure plate 1 and further protrudes from the bottom end surface of the pressure contact plate 3. The pressure contact plate 3 is disk-shaped or donut-shaped, and the pressure contact surface is flat in this embodiment.

The apparatus shown in FIG. 1 further includes a sheet plate 4, which is fixed in order to receive the pressing force from the pressure plate 1. The master sheet 5, which is a recorded master magnetic recording medium, and the copy sheet 6, which is a copy magnetic recording medium, are positioned by a positioning device (not shown) and placed on the sheet plate 4 in an overlapping state. . Although not shown in FIG. 1, a transfer bias magnetic field generating device is provided below the sheet plate 4, similar to the conventional device. The pressure plate 1 is provided with an air hole 7 for the purpose described later.
is connected to a vacuum pump (not shown).

Next, the operation of such a transfer device will be explained with reference to FIGS. 2 and 3.

First, as shown in FIG. 2, in the pressure plate 1, the tip of the vacuum air packing 2 contacts the sheet plate 4, and
The contact portion is lowered by driving an air cylinder or the like to a position where air cannot pass through, and is held at that position. In this state, master sheet 5
The pressure adhering plate 3 does not come into contact with the overlapping portion of the master sheet 5 and the copy sheet 6, and therefore, the adhering portion of the master sheet 5 and the copy sheet 6 is not pressurized and brought into close contact with each other.
There is no pressure. Next, the vacuum air packing 2 is pumped by the vacuum pump connected to the air hole 7.
All the air in the press chamber 8 surrounded by the press chamber 8 is exhausted to the outside, and the pressure is reduced. That is, the vacuum air packing 2, the air hole 7 provided in the pressure plate 1,
The vacuum pump connected to the air hole 7 mainly constitutes a pressure reducing mechanism.

When the degree of vacuum in the press chamber 8 reaches about 10 mHg, as shown in FIG. Then, a planar pressurized close contact is made. In this state, a transfer bias magnetic field is applied to the contact portion by a transfer bias magnetic field generator (not shown) disposed below the sheet plate 4, and transfer is performed. When the transfer bias is applied to the entire circumference of the recording track and the transfer is completed, the vacuum pump is stopped, and at the same time, air is introduced from the air hole 7, and the inside of the press chamber 8 returns to the original atmospheric pressure.
Next, the pressure plate 1 is raised to its original position (the position shown in FIG. 1), and one cycle of the transfer operation is completed. The sheet contains a material with a low _{Curie point} (approximately 120
~130℃) Using magnetic material, master sheet γ・
The same effect can be obtained by applying this method to thermomagnetic transfer using a relatively high temperature Curie point magnetic material such as Fe ₂ O ₃ .

Effects of the Invention As described above, in the present invention, only the contact area between the master sheet and the copy sheet is kept in a reduced pressure state,
Since the adhesion is performed using flat pressure with almost no air, even if the surfaces of the master sheet and copy sheet are smooth, there is no air trapped in the adhesion area, and stable transfer output can be achieved just by applying a weak adhesion pressure. At the same time, it is possible to minimize track misalignment between the master sheet and the copy sheet due to pressure. Furthermore, it is possible to perform depressurization and pressurization by just moving up and down like a general press, and since it is only necessary to depressurize the contact area, the time required for depressurization is very short, and the device is also compact. It has a simple structure and is easy to work with.

[Brief explanation of drawings]

In the above-mentioned embodiment, a case was described in which the pressurizing contact plate is disk-shaped, but the shape of the pressurizing contact plate is not limited to this, and may be any shape that matches the shape of the master sheet or copy sheet. Furthermore, in the above embodiment, one pressurizing cylinder was used to perform the two-stage press operation of depressurization and pressurizing contact, but two pressurizing cylinders were used,
Lower the pressure in the first cylinder to a position where it can be reduced,
A structure may be adopted in which pressure is applied from that position using the second cylinder. Furthermore, in the above-mentioned embodiment, the contact surface of the pressure contact plate is made flat, but if the contact surface of this pressure contact plate is made into a gently convex shape, there will be a gap between the master sheet and the copy sheet. The effect of pushing the remaining air out of the track can be obtained, and the master sheet and copy sheet can be brought into close contact more completely. Further, in the above-mentioned embodiments, an apparatus for carrying out an isothermal contact magnetic transfer method has been described, but the present invention is not limited to contact magnetic transfer. For example, FIG. 2 and 3 are schematic diagrams illustrating an embodiment of the apparatus, FIGS. 2 and 3 are schematic diagrams for explaining the operating state of the apparatus shown in FIG. 1, and FIG. 4 is an example of a transfer apparatus using a conventional plane pressure method. FIG. 5 is a schematic diagram showing an example of a transfer device using a conventional roll pressure method. 1... Pressure plate, 2... Vacuum air packing, 3
... Pressure contact plate, 4 ... Sheet board, 5 ... Recorded master magnetic recording medium, 6 ... Copy magnetic recording medium, 7 ... Air hole, 8 ... Press room.

Claims (1)

[Claims] 1. A transfer method for transferring recorded signals from a recorded master magnetic recording medium to a copy magnetic recording medium by contact magnetic transfer or thermomagnetic transfer,
A transfer method characterized in that the adhesion portions of the master magnetic recording medium and the copy magnetic recording medium are brought into a reduced pressure state without being pressed into close contact with each other, and the adhesion portions are brought into planar pressure contact in the reduced pressure state. 2. In a transfer device for transferring recorded signals from a recorded master magnetic recording medium to a copy magnetic recording medium by contact magnetic transfer or thermomagnetic transfer,
a sheet plate for positioning and supporting the master magnetic recording medium and the copy magnetic recording medium in a superimposed state; and a contact portion between the master magnetic recording medium and the copy magnetic recording medium supported on the sheet plate. a pressure contact plate for bringing the master magnetic recording medium and the copy magnetic recording medium into close contact with each other on the sheet plate before the planar pressure contact by the pressure contact plate; and a depressurizing mechanism for creating a depressurized state in the contact portion and maintaining the depressurized state during the planar pressurized contact. 3. The pressure contact plate is provided at the center of the pressure plate, which is moved toward or away from the sheet plate, and the pressure reduction mechanism is attached to the periphery of the pressure plate, and the pressure reduction mechanism is attached to the periphery of the pressure plate. A vacuum air packing whose tip can be brought into pressure contact with the surface of the sheet plate when approaching the sheet plate, and which communicates with a press chamber formed by the sheet plate, the pressure plate, and the vacuum air packing. As shown in FIG. However, the pressure contact plate does not press the contact portion of the master magnetic recording medium and the copy magnetic recording medium on the sheet plate into contact with each other under pressure, and the pressure contact plate does not press the contact portion of the master magnetic recording medium and the copy magnetic recording medium into contact with each other. 3. The transfer device according to claim 2, wherein the pressurizing and adhering plate brings the contact portions of the master magnetic recording medium and the copy magnetic recording medium on the sheet plate into planar pressurized contact in two operation movements. 4. The transfer device according to claim 2 or 3, wherein the contact surface of the pressure contact plate is formed in a flat shape. 5. The transfer device according to claim 2 or 3, wherein the contact surface of the pressure contact plate has a gently convex shape.