JPS6163929A - Method and device for transcription - Google Patents

Abstract

PURPOSE:To attain the satisfactory transcription with high workability by keeping a decompression state only at an adhesion part between a master sheet and a copy sheet, and applying the plane pressure and also applying a transcription bias magnetic field to said adhesion part. CONSTITUTION:A recorded master magnetic recording medium (master sheet) and a copy magnetic recording medium 6 (copy sheet) are put on a sheet plate 4. Then a pressure board 1 is moved down to secure a contact between the tip of a vacuum air packing 2 and the plate 4. Under such conditions, the exhaustion is carried out through a venthole 7 by means of a vacuum pump for decompression of a press chamber 8. The board 1 is moved down further, the adhesion pressure is applied to both sheets 5 and 6 via a pressure adhesion board 3. Thus the plane pressure adhesion is carried out. At the same time, a transcription bias magnetic field is applied to the adhesion part from a transcription bias magnetic field generator set under the plate 4. Then the transcription is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a transfer method and apparatus for transferring a recorded signal from a recorded master recording medium to a copy recording medium by contact magnetic transfer or thermal air transfer. .

Conventional techniques/techniques Conventionally, as a sheet-like magnetic recording medium, printing or documents are written on the surface of a convex body made of paper or plastic, and a magnetic material is provided on the back side, and the information related to the writing or printing on the front side is placed on the back side. Some audio or digital information is recorded and used as an audiovisual educational medium.

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 recorded copy sheets in large quantities in such sheet-like magnetic recording media, 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 well known to those skilled in the art, as disclosed in Japanese Utility Model Publication No. 51-19363 by the present applicant. Since this is a well-known technique, it will not be described in detail here.

Various transfer methods and devices have been proposed for the notebook-shaped magnetic recording medium as described above, 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). There are 4MK of devices that have been put into practical use that are roughly divided into two methods, a flat press method and a roll press method, depending on the method of adhesion.

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. There is a method in which the master sheet and the copy sheet are placed in 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.

An example of a conventional transfer device using the roll pressure method is:
As shown schematically in Figure 5 of the accompanying drawings, a master sheet a
and the coil sheet b, together with the temporary sheet d, the pressure roller f,
g and h, the pressure roller r rotates, and the temporary sheet d moves, thereby transferring the recording signals from the master sheet 1 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 formed in a spiral shape. 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 on the track and circumference. It has the advantage of relatively little track deviation and good transfer workability. However, in order to make the master sheet and copy sheet sufficiently adhere to each other using this method,
In experiments, a pressure of 3 to 5 kg/cnl is required, and if the recording area is large, a total pressure of several tons is required, which requires equipment and personnel. 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 lowering 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 recording is performed on a recording track or in a circular shape, the direction of the transfer bias magnetic field and the recording track are in the same direction due to the transfer efficiency. 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 pressure roll will cause the master sheet and copy Since the sheet is squeezed, there is a drawback in that it is easy to cause slippage.

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 significantly improve track misalignment between the master sheet and copy sheet due to pressurized adhesion. It is an object of the present invention to provide a transfer method and apparatus that have excellent transfer workability.

Means and Effects for Solving Problems In a transfer method for transferring recording signals from a master sheet 1- to a copy sheet by contact air transfer or thermomagnetic transfer, according to the present invention, the master sheet and the copy Without pressurizing the contact area with the sheet,
By setting the pressure in a reduced pressure state and bringing the contact portion into close contact with a flat surface under pressure, the air existing between the master sheet and the copy sheet is eliminated,
Good adhesion is maintained even with weak adhesion pressure, and good transfer is performed.

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 and supported in a superposed state. a pressure contact plate for pressurizing the contact portions of the master sheet and the copy sheet supported on the sheet board into close contact with each other on a flat surface; and the master sheet on the sheet I-board. 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 the adhesion is maintained well even with a weak contact pressure. Transcription takes place.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in more detail with reference to embodiments of the invention with reference to FIGS. 1, 2 and 3M 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. 2 and 3 are schematic diagrams for explaining the operating state of the apparatus shown in FIG. 1. FIG. The contact magnetic transfer device shown in FIG. 1 includes a pressure plate I, 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 at the periphery of the lower surface of the pressure plate 1, and a pressure contact plate 3 is provided at the center. Both the vacuum air packing 2 and the pressurizing contact plate 3 are preferably made of an elastic body such as rubber. The pressure plate 1 is disk-shaped in this embodiment, and the vacuum air packing 2 is
It is fixed in the circumferential shape of t, and further protrudes from the bottom end surface of the pressurizing contact plate 3. The pressure contact plate 3 has a disk shape or a donut shape, 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 l. A master sheet 5 which is a recorded master magnetic recording medium and a 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 l has an air hole 7 for the purpose described later.
A vacuum pump (not shown) is connected to the air hole 7.

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

First, as shown in FIG. 2, the pressure plate l is lowered by driving an air cylinder or the like to a position where the tip of the vacuum air packing 2 contacts the sheet plate 4 and air cannot pass through this contact area. It is held in that position. In this state, the pressure contact plate 3 does not come into contact with the overlapping portion of the master sheet 5 and the copy sheet 6, and therefore the master sheet 5
The contact area between the copy sheet 6 and the copy sheet 6 is not pressurized and is in a non-pressure state. Next, all the air in the press chamber 8 surrounded by the vacuum air packing 2 is brought out by the vacuum pump connected to the air hole 7, and the pressure is reduced. That is, the vacuum air packing 2, the air hole 7 provided in the pressure plate 1, and the vacuum pump connected to the air hole 7 mainly constitute a pressure reducing mechanism.

When the degree of vacuum in the press chamber 8 reaches about 1 OmHg, the pressure plate 1 is further lowered, as shown in FIG.
The pressure contact plate 3 applies contact pressure to the master sheet 5 and the copy sheet 6 to achieve a planar pressure contact. 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.

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, and the first cylinder Lower the pressure to a position where it can be decompressed,
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.
It can also be applied to thermomagnetic transfer when using a magnetic material with a low Curi temperature (approximately 120 to 130 degrees Celsius) such as a magnetic material with a relatively high Curi temperature such as master sheet γ/FezO3. , the same effect can be obtained.

Effects of the Invention As described above, in the present invention, only the areas where the master sheet and the copy sheet are in close contact with each other are kept in a reduced pressure state, and the adhesion is performed by flat pressure in an air-free state. Even when the surface of the copy sheet is smooth, air is not trapped in the contact area, and stable transfer output can be obtained by applying only a weak contact pressure, and track misalignment between the master sheet and copy sheet due to pressure can be minimized. can. Furthermore, decompression and pressurization can be performed only by the amplifier down movement 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 equipment is also It has a small and simple structure and has good workability.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an embodiment of a transfer device for carrying out the transfer method of the present invention, FIGS. 2 and 3 are schematic diagrams for explaining the operating state of the device in FIG. 1, and FIG. 5 is a schematic diagram showing an example of a transfer device using a conventional plane pressure method, and FIG. 5 is a schematic diagram showing an example of a transfer device using a conventional roll pressure method.

Claims (5)

[Claims] (1) In 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 contact portion between the master magnetic recording medium and the copy magnetic recording medium is A transfer method characterized in that a pressure is reduced in a state where pressure is not brought into close contact, and the contact portion is brought into planar pressure contact in the reduced pressure state. (2) In a transfer device for transferring recording signals from a recorded master magnetic recording medium to a copy magnetic recording medium by contact magnetic transfer or thermomagnetic transfer, the master magnetic recording medium and the copy magnetic recording medium are superimposed. a sheet plate for positioning and supporting the master magnetic recording medium and the copy magnetic recording medium supported on the sheet plate, a pressurizing contact plate for bringing the contact portions of the master magnetic recording medium and the copy magnetic recording medium, which are supported on the sheet plate, into planar pressurized contact; and the sheet plate. Surrounding the contact area between the master magnetic recording medium and the copy magnetic recording medium on the plate, and creating a reduced pressure state in the contact area before the planar pressure contact by the pressure contact plate, and during the planar pressure contact. A transfer device comprising: a decompression mechanism for maintaining a depressurized state. (3) The pressure contact plate is provided at the center of the pressure plate that is moved toward or away from the sheet plate, and the pressure reduction mechanism is attached to the periphery of the pressure plate to apply this pressure. A vacuum air packing whose tip can be brought into pressure contact with the sheet plate surface when the pressure plate approaches the sheet plate, and a press chamber formed by the sheet plate, the pressure plate, and the vacuum air packing communicates with each other. The pressure plate is composed of an air hole provided in the pressure plate and a vacuum pump connected to the air hole, and in the first operation movement of the pressure plate, the tip of the vacuum air packing is placed on the sheet plate. Although 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,
In a second operation movement of the pressure plate following the first operation movement, the pressure contact plate brings the contact portions of the master magnetic recording medium and the copy magnetic recording medium on the sheet plate into close contact by plane pressure. The transfer device according to scope (2). (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.