JPH0945029A - Optical data-recording medium, method for forming film on the medium and jig for joining film used in the film formation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an optical data-recording medium which is inexpensive and highly reliable. SOLUTION: This is a disc-like optical data-recording medium 5 stored inside protecting cases 3 and 4 and having a data-recording film formed on a surface thereof. At the side of an inner periphery of the medium 5, an abrasion-resistant film 52 with lubricity is coated on surfaces in an area to be in touch with the protecting cases 3, 4 and not to interfere with a drive device. Accordingly, even when the optical data-recording medium 5 comes in touch with the protecting cases 3, 4, the presence of the film 52 at the position avoids damages to the optical data-recording medium 5, and also restricts the generation of abrasion particles from the optical data-recording medium 5 and protecting cases 3, 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc-shaped optical information recording medium housed inside a protective case and having an information recording film formed on the surface thereof, a film forming method for the optical information recording medium, and a film forming method for the optical information recording medium. The present invention relates to a film attachment jig used in the method.

[0002]

2. Description of the Related Art A conventional optical information recording medium of this type, for example, a magneto-optical disk, is housed in a protective case generally called a cartridge shell in a state in which it can be raised and lowered, and thus, for example, recording / reproducing. When it is attached to a drive such as a device or a read-only device and is rotationally driven for recording or playback, it floats in the protective case so that it can rotate. It is adapted to come into contact with and be supported by a required portion on the inner peripheral side.

The magneto-optical disk based on this drive system does not stop immediately when the rotational drive is stopped, but there is a period during which it idles in a floating state due to inertia before the stop, so that the inertial force decreases as the inertial force decreases. However, there is a high possibility that the magneto-optical disk, which has been levitated up to that point, will descend due to its own weight in a state where the levitating posture of the magneto-optical disc during rotation is collapsed. If the inside of the protective case is lowered while rotating in such a lowered posture, the inner peripheral side of the magneto-optical disk will be in sliding contact with the supporting portion of the protective case.

If such sliding contact occurs every time recording, recording stop, reproduction, and reproduction stop are repeated, the inner peripheral surface of the magneto-optical disk is easily and early damaged. Not only that, the protective case is also abraded at the sliding contact portion with the protective case, so that abrasion powder is generated in the protective case. Such abrasion powder easily adheres to the information recording film on the surface of the magneto-optical disk and causes a failure in writing or reading information on the magneto-optical disk.

In order to eliminate the above-mentioned defects caused by such abrasion powder, the wear target area on the inner circumference of the magneto-optical disk is provided with 4
It is considered that the annular sheet made of fluorinated ethylene is attached to prevent the above-mentioned damage and abrasion.

[0006]

By the way, in the above-mentioned conventional magneto-optical disk, it is necessary to control the attaching position of the annular sheet with extremely high accuracy for the following reasons, which deteriorates workability and reduces cost. It is forced to soar.

That is, there is a portion on the inner circumference of the magneto-optical disk that engages with the spindle of a drive device such as a recording / reproducing device or a reproduction-only device, and the above-mentioned annular sheet is adhered thereto. In some cases, the reference plane of the spindle deviates from the magneto-optical disk, leading to poor focus of the pickup. In order to avoid such interference, it is necessary to manage the attachment position of the annular sheet with high accuracy.

Further, the applicant of the present application thought that it would suffice if the tetrafluoroethylene resin was simply applied and formed into a film, but as a result of experiments, it was found that the curing treatment after application was performed at about 300 ° C.
It has been found that it cannot be realized because the magneto-optical disk itself is thermally deteriorated because it needs to be baked at a high temperature.

Therefore, an object of the present invention is to provide an inexpensive and highly reliable optical information recording medium.

Another object of the present invention is to provide a film forming method which can be used for manufacturing a highly reliable optical information recording medium while having good workability and cost advantages.

A further object of the present invention is to provide a film attachment jig that can be mass-produced.

[0012]

The optical information recording medium of the present invention is a disk-shaped medium which is housed inside a protective case and has an information recording film formed on the surface thereof. A film having wear resistance and lubricity is formed by coating on the surface of the region that can come into contact with and does not interfere with the drive device.

The above-mentioned film may be an ultraviolet curable resin or a thermosetting resin which is cured by firing at a temperature that does not deteriorate the optical information recording medium itself.

A film forming method for an optical information recording medium according to the present invention comprises a protective case, which is housed inside a protective case and has an information recording film formed on the surface thereof, on the inner peripheral side of the disc-shaped optical information recording medium. A method of forming a film having wear resistance and lubricity on the surface of a region that can abut and does not interfere with a drive device, the method being substantially the same as the film formation target region of the optical information recording medium. The step of adhering the liquid raw material of the film having abrasion resistance and lubricity to the surface of the jig having the surface, and the liquid raw material adhered to the surface of the jig are used as a film forming object of the optical information recording medium. The method includes a step of transferring the liquid material to an area and a step of curing the transferred liquid material by irradiating ultraviolet rays or by firing at a temperature that does not deteriorate the optical information recording medium itself.

The film adhering jig of the present invention is used in the above-mentioned film forming method, and the surface to which the liquid raw material is adhered and the portion having the surface are impregnated materials for impregnating and holding a required amount of the liquid raw material. Has been formed.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the embodiments shown in FIGS. 1 to 3
1 is an exploded perspective view of a magneto-optical disk device, FIG. 2 is a plan view of the magneto-optical disk device, and FIG. 3 is a sectional view of the magneto-optical disk device.

In the figure, 1 is a magneto-optical disk device, and 2 is a spindle of a drive device such as a recording / reproducing device or a reproduction-only device.

The magneto-optical disk device 1 has a pair of cartridge shells 3 and 4 as a protective case, and a disc-shaped optical information recording medium having an information recording film (not shown) formed on the surface. A magneto-optical disk 5 and a slide shutter 6 mounted on the cartridge shells 3 and 4.
And the following configurations, respectively.

The spindle 2 of the drive device includes a cylindrical main body portion 21 on which the optical disc 5 is mounted, and a pin portion 22 which is provided at the center of the main body portion 21 so as to project upward so that the magneto-optical disc 5 is positioned and mounted. , And an annular receiving portion 23 which is provided so as to project upward on the outer periphery of the pin portion 22 and serves as a reference surface for receiving the magneto-optical disk 5.

The cartridge shells 3 and 4 of the magneto-optical disk device 1 are a combination of plates.
Circular holes 31 and 41 are provided in the centers of the respective cartridge shells. In the vicinity of the circular holes 31 and 41 of both cartridge shells 3 and 4, rectangular opening windows 32 and 42, a part of which are connected to the circular holes 31 and 41, are formed.
Is provided. Also, both cartridge shells 3, 4
On the inner circumferences of the circular holes 31 and 41, supporting protrusions 33 and 43 for restricting a remarkable displacement of the magneto-optical disk 5 during rotation are provided.

The magneto-optical disk 5 is formed of, for example, polycarbonate, and is mounted on the main body 21 of the spindle 2 of the drive unit and fitted to the pin 22 of the spindle 2 at the center thereof. A pair of two clamping plates 51 are attached so as to be sandwiched from both front and back surfaces.

Then, on the surface of the region of the magneto-optical disk 5 where the supporting projections 33, 42 of the cartridge shells 3, 4 can abut, and which does not interfere with the receiving portion 23 of the spindle 2 of the drive device, An annular film 52 having wear resistance and lubricity is formed by coating.
Specifically, in the case of the magneto-optical disk 5 having a diameter of 130 mm, for example, the above-mentioned area has a radius of 17.
The range is 5 mm or more and 27.0 mm or less, and in the case of the magneto-optical disk 5 having a diameter of 90 mm, the radius is 10.5 mm or more and 22.6 mm or less from the center of the disk. The film 52 is made of an ultraviolet curable resin such as an acrylic resin or an acrylic urethane resin, or a thermosetting resin such as an epoxy resin or a silicone resin.
A material that can be cured at a relatively low temperature of 0 ° C. or lower is used.

The slide shutter 6 opens and closes the opening windows 32 and 42 of the cartridge shells 3 and 4.

Next, an example of the method and procedure for forming the film 52 on the magneto-optical disk 5 will be described. Here, FIG.
A positioning jig 7 and a stamp jig 8 as shown in FIG. 5 are used. The positioning jig 7 includes a mounting base 71 on which the magneto-optical disk 5 without the clamping plate 51 is mounted in a horizontal posture, and a pin portion which fits into the center hole of the magneto-optical disk 5 at the center of the mounting base 71. And 72. The stamp jig 8 is a kind of letterpress printing, and has a concave portion 8 into which the pin portion 72 of the positioning jig 7 is fitted.
1, a reservoir 82 disposed around the recess 81 for storing the liquid raw material of the film 52, and a transfer body 83 made of an impregnating resin that permeates the liquid raw material below the reservoir 82. There is. An annular convex portion 84 is provided on the outer surface of the transfer body 83.

Before being housed in the cartridge shells 3 and 4, the magneto-optical disk 5 to which the clamping plate 51 is not attached is prepared. As shown in FIG.
By fitting the center hole of the magneto-optical disc 5 into the pin portion 72 of the positioning jig 7, the magneto-optical disc 5 is placed on the mounting base 71 of the positioning jig 7 in a horizontal posture with the surface side of the magneto-optical disc 5 facing upward. Position and support.

The magneto-optical disk 5 on the positioning jig 7
The stamp jig 8 above the stamp jig 8 is lowered to press the convex portion 84 of the stamp jig 8 against a predetermined area on the surface of the magneto-optical disk 5 to store the reservoir 82 of the stamp jig 8. The liquid raw material supplied from the substrate and transferred from the convex portion 84 of the transfer body 83 is transferred. The stamp jig 8
When is lowered, the concave portion 81 is fitted into the pin portion 72 of the positioning jig 7, so that the transfer of the liquid raw material from the convex portion 84 of the stamp jig 8 is positioned.

The transferred liquid material is cured. As the curing means, it is possible to select, depending on the liquid raw material used, whether to irradiate with ultraviolet rays or to fire at a temperature that does not deteriorate the magneto-optical disk 5 itself. For example, when an ultraviolet curable resin material such as an acrylic resin is used, it may be cured by irradiating it with ultraviolet rays having an integrated light amount of 300 to 5000 mj / cm ² .

In this way, after the film 52 is formed on the surface of the magneto-optical disk 5 by coating, the film 52 may be formed on the back surface of the magneto-optical disk 5 through the same steps as described above.

As described above, if the required area of the magneto-optical disk 5 is coated with the film 52 having wear resistance and lubricity, the magneto-optical disk 5 is provided with the supporting projections 33 of the cartridge shells 3, 4. , 43, even when abutting or slidingly contacting, it is possible to prevent damage, reduce frictional resistance, and suppress generation of abrasion powder.

Moreover, the method for forming the film 52 is much simpler than that in the case of pasting a sheet. In particular, in this embodiment, in the step of transferring the liquid raw material of the film 52, the stamp jig 8 holding the liquid raw material is used to improve workability.
It will be able to greatly contribute to the improvement of productivity and the reduction of manufacturing cost.

The present invention is not limited to the above embodiment, and various applications and modifications are conceivable. For example, as a method for coating the liquid raw material when forming the film 52 on the magneto-optical disk 5, it is possible to directly apply it with a pen, a brush or the like. Also, as the stamp jig 8,
The structure may not be provided with the storage body 82, and the liquid coating material may be attached to the convex portions of the transfer body 83. Further, intaglio printing can be used instead of letterpress printing.

[0032]

According to the optical information recording medium of the present invention, even when the optical information recording medium is brought into contact with or slides against the protective case, damage can be prevented and frictional resistance can be reduced, so that generation of abrasion powder can be suppressed. become. Further, the film can be obtained only by applying and curing it in an area that avoids interference with the drive device. Therefore, a highly reliable optical information recording medium can be provided at low cost.

In the film forming method of the present invention, when the liquid raw material is transferred from the jig, only high accuracy is required for positioning the jig and the transfer object, and the manufacturing cost is lower than that of the conventional example in which the sheet is bonded. Since the number of soaring elements can be reduced, the manufacturing cost can be reduced.

In the film adhering jig of the present invention, by setting a large amount of the liquid raw material impregnated and held therein, it becomes possible to repeat the film adhering operation for a plurality of times, thereby eliminating unnecessary work. As a result, productivity can be improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a magneto-optical disk device according to an embodiment of the present invention.

FIG. 2 is a plan view of the apparatus.

FIG. 3 is a vertical sectional view of the device.

FIG. 4 is a side view showing a film forming jig for a magneto-optical disk.

5 is a vertical cross-sectional view of the main part of the stamp jig of FIG.

[Explanation of symbols]

 1 magneto-optical disk device 2 spindle of drive device 23 receiving part of spindle 3,4 cartridge shell of magneto-optical disk device 33, 43 convex portion for supporting cartridge shell 5 magneto-optical disk 51 clamping plate of magneto-optical disk 52 magneto-optical disk Disk film 7 Positioning jig 8 Stamp jig 83 Stamp jig transfer body

Claims (4)

[Claims] 1. A disk-shaped optical information recording medium, which is housed inside a protective case and has an information recording film formed on the surface thereof, in an area that can abut the protective case on the inner peripheral side. An optical information recording medium, characterized in that a film having abrasion resistance and lubricity is formed on the surface of a region that does not interfere with the above. 2. The optical information recording medium according to claim 1, wherein the film is made of an ultraviolet curable resin or a thermosetting resin that is cured by firing at a temperature that does not deteriorate the optical information recording medium itself. 3. An inner peripheral side of a disc-shaped optical information recording medium having an information recording film formed on the surface thereof, which is housed inside a protective case, and which is in a region that can come into contact with the protective case, and with respect to a drive device. A method of forming a film having wear resistance and lubricity on the surface of a non-interfering area by coating, wherein the surface of the jig having a surface having substantially the same shape as the film formation target area of the optical information recording medium is Attaching a liquid raw material of a film having abrasion resistance and lubricity, transferring the liquid raw material attached to the surface of the jig to a film formation target area of an optical information recording medium, And a step of curing the liquid raw material by irradiating with ultraviolet rays or firing at a temperature that does not deteriorate the optical information recording medium itself, and a film forming method for the optical information recording medium. 4. A film attachment jig used in the film forming method according to claim 3, wherein the surface to which the liquid source is attached and the portion having the surface are
A film attachment jig, which is formed of an impregnating material that impregnates and holds a required amount of liquid raw material.