JPH0419885A - Optical memory element - Google Patents

Abstract

PURPOSE:To enable a user to freely write and rewrite required items on a film which is subjected to writing an erasing by writing means according to the rewriting of the recording of the optical memory element by fixing this film onto a protective resin layer. CONSTITUTION:The film 4 having 5 to 200mum is provided on the protective resin layer 3. Blank materials which can be written with characters, etc., by the writing means to be exclusively used or for general uses and allow the erasing of the characters, etc., written by the erasing means to be exclusively used or for general uses are used for this film 4; for example, films made of paper, resin films made of fluororesins, polyester, etc., and metallic films consisting of Al and stainless steel, etc., are used alone or in combination. The film 4 is securely adhered onto the protective resin layer 3 by an adhesive. The user is able to freely write and rewrite the required items on this film 4 in this way according to the rewriting of the recording of the optical memory element.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical memory device that records, erases, and reproduces information using light.

[Conventional technology]

Optical memory devices use magneto-optic effects, photochromic effects, phase changes, melting, decomposition, etc. to record, erase, and reproduce information using light, and are being researched as high-density, large-capacity memory devices. Development is actively underway.

As an example of this type of optical memory element, a magneto-optical memory element that utilizes the magneto-optic effect is shown in FIG.
A recording medium layer 2 made of a magnetic film or the like and a protective resin layer 3 for protecting the recording medium layer 2 are sequentially formed on a transparent substrate 1.

Then, when the magneto-optical memory element is actually put on the market as a product, a table of contents showing the recorded contents, the name of the manufacturing company, etc. are printed directly on the protective resin layer 3 using, for example, ultraviolet ink, or A printed tape such as the table of contents is attached.

[Problem to be solved by the invention]

However, the conventional configuration described above has a problem in that when the user rewrites the information, the actual recorded content and the printed content no longer match.

Therefore, in order to solve this problem, it is possible to apply the following two methods that are used in magnetic cassette tapes such as audio cassettes and video cassettes that are currently widely available on the market.

(i) Fill in the necessary information on a paper sheet called an index card, and store it in a cassette case along with a magnetic cassette tape.

(ii) Fill in the necessary information on a paper sheet called an adhesive sheet, and paste it onto the magnetic cassette tape.

However, with method (i) above, if the magneto-optical memory element and the case in which it is stored are mixed up, as is the case with magnetic cassette tapes, the contents of the magneto-optical memory element and the index card may be lost. The content will no longer match. For this reason, it is conceivable to use the method (it) above in combination, similar to the magnetic cassette tape.

Figure 4 shows the pasting sheet 9 on which the user has filled in the necessary information.
A magneto-optical disk serving as a magneto-optical memory element having a protective resin layer 3 affixed thereto is shown mounted in a magneto-optical disk device. When recording/erasing information, a light beam 10b focused by an objective lens 10a is irradiated onto the recording medium layer 2 from the transparent substrate 1 side, and in this state, a magnetic head with a coil lla wound around a coil core llb is activated. 11 applies an external magnetic field to the irradiation section from the protective resin layer 3 side.

By the way, in a magneto-optical memory element, information is recorded depending on whether the magnetization direction of the magnetic film of the recording medium layer 2 is upward or downward, so in order to increase the recording density, it is necessary to switch the external magnetic field at high speed. There is. Therefore, the coil lla and the coil core 11 constituting the magnetic head 11
Since b is made as small as possible, and the generated magnetic field strength is also reduced accordingly, it is necessary to make the distance between the magnetic head 11 and the recording medium layer 2 considerably small. Specifically, in the case of a magneto-optical disk that is the same size as a compact disk and can freely rewrite music information of the same duration, the distance between the magnetic hand 11 and the recording medium layer 2 is about 200 to 500 μm, and the protective resin layer Since the thickness of the magnetic head 3 is approximately 10 μm, the distance between the magnetic head 11 and the protective resin layer 3, ie, the gap, is approximately 200 to 500 μm.

Therefore, as shown in FIG.
If it is larger than the gap, not only will it become an obstacle when the magnetic head 11 moves in the radial direction of the magneto-optical disk (in the direction of the arrow in the figure), but there is a risk that the magnetic head 11 will be damaged.

Furthermore, since the adhesive sheet 9 is reattached in accordance with rewriting of information, it is attached using a relatively weak adhesive.

Therefore, even if the adhesive sheet 9 can be applied straight, wrinkles 9a and blisters 9b may occur due to heat inside the magneto-optical disk device, storage of the magneto-optical disk in a high temperature and humid environment, etc.

Furthermore, when the magneto-optical disk is inserted into or removed from the magneto-optical disk device, there is a problem in that the magneto-optical disk is likely to get caught in the insertion/removal opening of the magneto-optical disk device due to wrinkles 9a and creases 9b of the adhesive sheet 9. ing. This problem is often experienced in current magnetic cassette discs, and can commonly occur not only in magneto-optical disks but also in optical memory devices that do not use magnetic heads.

As described above, even if the above two methods employed in magnetic cassette tapes are applied to optical memory devices such as magneto-optical disks, new problems arise and the problems are not fundamentally solved.

Another method is to write the necessary information directly on the protective resin layer 3, but there is a risk of damaging the protective resin layer 3, and the reliability of the recording medium layer 2 cannot be ensured. There is a problem in doing so.

[Means to solve the problem]

In order to solve the above problems, the optical memory element of the present invention is an optical memory element in which a recording medium layer and a protective resin layer are sequentially formed on a substrate, and which records, erases, and reproduces information using light. The invention is characterized in that a film on which writing and erasing is performed is fixed on the protective resin layer.

[For production]

According to the above configuration, since the film on which writing and erasing is performed using a writing instrument, specifically, for example, a fluororesin film, is fixed on the protective resin layer, the user can You can freely write and rewrite the necessary information on this film. Furthermore, since the film is previously fixed onto the protective resin layer with an adhesive or the like, wrinkles and peeling are less likely to occur.

〔Example〕

An embodiment of the present invention will be described below based on FIGS. 1 and 2. Note that members having the same functions as those shown in the drawings of the conventional example are given the same reference numerals.

As shown in FIG. 1, a magneto-optical memory element as an optical memory element according to the present invention has a recording medium layer 2 made of a magnetic film or the like on a transparent substrate 1, and a protective resin layer that protects this recording medium layer 2. 3 and a film 4 on which written characters can be written and erased using a writing instrument are formed in sequence.

Specifically, the transparent substrate 1 is made of, for example, plastic such as polycarbonate, acrylic, epoxy, or amorphous polyolefin, or glass. Further, the recording medium layer 2 has a structure in which a first dielectric film, a magnetic film, a second dielectric film, a reflective film, etc. are sequentially formed. AfN is used for the dielectric film, a rare earth transition metal alloy thin film such as DyFeCo is used for the magnetic film, and 80 is used for the reflective film. In addition, the protective resin N8 has a thickness of about 1 liter and is made of, for example, polyurethane acrylate, epoxy acrylate, etc. as a main component.
Oum's UV curing resin is used.

In the magneto-optical memory element of this example, the retention time is 3! A film 4 having a thickness of 5 μm to 200 μm is provided on the resin layer 3. This film 4 is made of a material that allows writing of characters, etc., with a dedicated or general-purpose writing instrument, and erasing of the written characters, etc., with a dedicated or general-purpose erasing tool,
Specifically, for example, paper films, resin films such as fluororesin and polyester, A! Metal films such as steel and stainless steel are used singly or in combination.

The film 4 is firmly adhered onto the protective resin layer 3 using an adhesive. The adhesive preferably has strong adhesion to both the film 4 and the protective resin layer 3; for example, a photomelt adhesive, an epoxy adhesive, a silicone adhesive, or an ultraviolet curing adhesive is used. Ru. Also,
It may be adhered using double-sided tape or the like.

Moreover, ruled lines, a table of contents, etc. may be printed in advance on the film 4 for convenience when filling in information, or the name of a manufacturing company, product name, etc. may be printed on the film 4.

According to the above configuration, the user can freely write and erase necessary information on the film 4 according to the recorded content of the magneto-optical memory element, and the film 4 is firmly attached to the protective resin layer 3 using an adhesive in advance. Since the film 4 is adhesively bonded to the film 4, it is possible to prevent the film 4 from turning over and eliminate troubles when attaching and detaching the magneto-optical memory element to a recording/reproducing device. moreover,
By providing the film 4 on the protective resin layer 3, the protective resin N3 is less likely to be scratched, and the reliability of the magneto-optical memory element is further increased.

Note that various materials can be used as the film 4 as described above, but among them, fluororesin film (for example, Afflex manufactured by Asahi Glass Co., Ltd.) has a good track record of being used as a surface material for well-known blackboard copyboards. It is ideal for writing and erasing necessary information, and it also has excellent stain resistance, heat resistance, weather resistance, and chemical resistance, and has low water absorption, so it improves the environmental resistance and reliability of optical memory devices. Suitable for improving sexual performance.

As a specific example of a magneto-optical memory element, FIG. 2 shows the configuration of a magneto-optical disk.

After a ring-shaped recording medium N2 is formed on a disk-shaped transparent substrate 1 with a drive hole 5 for rotational drive provided in the center, a ring-shaped protective resin is formed to cover the entire recording medium layer 2. Layer 3 is formed. Then, a ring-shaped film 4 is adhered so as to further cover the entire protective resin layer 3.

Here, the film 4 does not necessarily need to cover the entire protective resin layer 3, and only needs to have an area where necessary information can be written. However, by covering the entire protective resin layer 3, it is possible to prevent the protective resin layer 3 from being accidentally scratched during writing or erasing, and this allows the protective resin layer 3 to function for a long period of time and prevents the recording medium layer from being scratched. 2 reliability is maintained for a long time.

In the above embodiments, a magneto-optical memory element that utilizes the magneto-optic effect was explained as an optical memory element, but information can be recorded, erased, and reproduced by light using the photochromic effect, phase change, melting, decomposition, etc. It can be applied to all types of optical memory devices. Further, the shape of the optical memory element is not limited to a disk shape, but can be similarly applied to a card shape.

〔Effect of the invention〕

As described above, in the optical memory device of the present invention, the film on which writing and erasing can be performed using a writing instrument is fixed on the protective resin layer. You can freely enter and rewrite the necessary information.

Moreover, since the film is previously fixed onto the protective resin layer with an adhesive or the like, wrinkles and curling are less likely to occur. For this reason, when an optical memory element is attached to or removed from a recording/reproducing device,
This has the effect that troubles such as getting caught in the attachment/detachment opening are less likely to occur. Further, by providing the film on the protective resin layer, the protective i1 II resin layer is less likely to be scratched, and the reliability of the optical memory element is further improved.

[Brief explanation of drawings]

1 and 2 show one embodiment of the present invention. FIG. 1 is a vertical cross-sectional view showing a schematic configuration of a magneto-optical memory element. FIG. 2 is a longitudinal sectional view showing a specific structure of the magneto-optical disk. 3 to 5 show conventional examples. FIG. 3 is a vertical cross-sectional view showing the schematic structure of the magneto-optical memory element. FIG. 4 is an explanatory diagram showing how a magneto-optical disk is mounted in a magneto-optical disk device. FIG. 5 is an explanatory diagram showing the effects of wrinkles and curling of the adhesive sheet attached to the magneto-optical disk. 1 is a transparent substrate, 2 is a recording medium layer, 3 is a protective resin layer, and 4 is a film. Patent applicant Sharp Co., Ltd.

Claims (1)

[Claims] 1. In an optical memory device in which a recording medium layer and a protective resin layer are sequentially formed on a substrate and information is recorded, erased, and reproduced using light, a film on which writing and erasing are performed using a writing instrument is provided. An optical memory element, characterized in that it is fixed on the protective resin layer.