JPH03116558A - Optical card - Google Patents

Abstract

PURPOSE:To reduce the cost of production and to improve reliability by sticking a film or sheet which forms a recording layer to a transparent substrate in an outer part and non-recording part in such a manner that the signal recording surface is positioned on the inner side. CONSTITUTION:The film or sheet 1 which forms the recording layer 2 having an optical recording material layer and the transparent substrate 4 are stuck in the outer peripheral part 5a and the part 5b exclusive of the recording part with the signal recording surface positioned on the inner side, by which the generation of adhered and unadhered parts in the recording part is obviated and, therefore, the generation of a partial air pool is obviated. In addition, there is no contact with an adhesive agent, by which the need for considering the influence of the deterioration in properties, etc., of the optical recording material by the adhesive agent is eliminated for the DRAW or rewritable optical card. The production cost is reduced in this way and the reliability is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical card, and particularly to an optical card that can reduce manufacturing costs and improve reliability.

[Prior Art] Optical recording has advantages over magnetic recording in that there is no contact between the recording medium and the head, and high-density recording is possible. These optical recording media are known to be read-only, additionally writable, and erasable/rewritable, and are already in practical use in the form of optical discs (compact discs), laser discs, optical cards, etc. It has been served to In particular, optical cards formed in the form of cards are expected to be in great demand as small-sized recording media with good storage capacity, portability, and accessibility.

In this optical card, information recorded in a predetermined area on the surface of the card is formed by a plurality of straight tracks as pit rows, that is, a plurality of parallel uneven patterns, and by scanning this information track, The recorded information is reproduced. Information is recorded and reproduced using a light beam from an optical head.

[Problems to be Solved by the Invention] Conventionally, this type of optical card, such as an optical disk or a laser disk, has a resin substrate with a recording layer such as a concavo-convex pattern or a pregroove for signals, and a reflective film layer. A resin film or sheet is bonded to this. However, such optical cards require batch processing in each step of manufacturing the card, resulting in high manufacturing costs.

Therefore, optical cards, such as read-only optical cards,
A pregroove is transferred onto a resin film or sheet using a heat press, etc., a light reflective film layer is formed on this signal recording surface, and a resin substrate is then entirely adhered onto this light reflective film layer using an adhesive, etc. are doing. Similarly, for optical cards that allow additional writing or rewritability, pregrooves are transferred to a resin film or sheet by heat press, etc., as necessary, and a pregroove is transferred onto this signal recording surface according to the additional writing or rewritable type. An optical recording material layer is formed, and a resin substrate is further bonded onto this surface.

However, with such conventional optical cards, in the case of full-surface adhesive bonding, it is extremely difficult to apply adhesive evenly over the entire surface, and it is also difficult to bond without creating air pockets. As a result, there is a problem in that defects occur in the recording section and reliability decreases.

The present invention was made to solve the above-mentioned problem, and an object of the present invention is to provide an optical card that can reduce manufacturing costs and improve reliability.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an optical card having a recording layer in at least a part of the card body that is capable of optically recording or reproducing signals. The film or sheet forming the recording layer is bonded to a transparent substrate at the outer peripheral portion and the non-recording portion so that the signal recording surface is on the inside.

Therefore, in the optical card of the present invention, the film or sheet forming the recording layer having the concavo-convex pattern or pregroove of the signal, or the optical recording material layer, and the transparent substrate,
By bonding the outer circumferential portion and the non-recording portion (non-recording portion) with the signal recording surface inside, there will be no adhesive or non-adhesive portions in the recording portion, and therefore there will be no air pockets in the area. Never occurs. Also,
Since there is no contact with the adhesive, there is no need to consider the effects of deterioration of the optical recording material due to the adhesive in an optical card that allows additional writing or rewriting.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing an example of the overall configuration when the present invention is applied to an optical card capable of optically recording or reproducing signals. That is, the optical card of this embodiment has a recording layer 2 such as a signal concave-convex pattern or pregroove on one side of a film or sheet 1 as shown in FIG.
, a light reflective film layer 3 is formed thereon, and a transparent substrate 4 as shown in FIG. a%
The portions other than the recording portion 5b (non-recording portions) are bonded together using an adhesive.

Here, the material of the film or sheet 1 is generally a heat-resistant resin such as polyester resin, polycarbonate resin, vinyl chloride resin, acrylic resin, etc.
Or a laminate thereof can be used. And, from the characteristics such as surface smoothness and heat resistance, the thickness is 10μm to 500μm.
It is optimal to use a polyester resin with a diameter of approximately 30 μm to 150 μm. In this example, the thickness is 50
A μm polyester resin is used.

The recording layer 2 is formed by overlapping the surface of a standby bar, that is, the signal matrix, on one side of the film or sheet 1 using a press machine, heating and pressurizing it, cooling it, and then forming the signal by emboss molding. Forms an uneven pattern, pre-groove, etc. In this case, any of a flat press, a circular press, or a rotary press may be used. Further, the depth of the bit and pregroove is set to 0.2 to 0.5 μm. In this example, pits with a depth of 0.35 μm are transferred by heat pressing using a stand bar.

Further, as the light reflection film layer 3, metals such as aluminum, aluminum alloy, copper, copper alloy, gold, silver, platinum, nickel, etc. are deposited in a specified manner by a method such as a vacuum evaporation method, a sputtering method, an ion blating method, etc. It is provided at a thickness of 0.1 μm that provides a good reflectance. In this example, a reflective film layer 3 made of aluminum and having a thickness of 0.1 μm is provided.

On the other hand, as the material for the substrate 4, it is common to use a transparent resin with low birefringence, taking into consideration transmittance, birefringence, etc., such as glass, polycarbonate resin, acrylic resin, vinyl chloride resin, etc. ．． Epoxy resin, amorphous polyolefin resin, etc., or a laminate thereof can be used. In this example, polycarbonate resin is used.

The optimum thickness of the substrate 4 is such that the thickness of the entire optical card is 0.71 to 0.8 degrees.

Further, as the adhesive, general adhesives such as urethane adhesive, epoxy adhesive, acrylic adhesive, etc. can be used. In this example, acrylic adhesive is used.

Furthermore, the width of the contact portion including the outer and inner circumferences is 0.
The distance should be approximately 5 meters to 3.0 m+s.

In the optical card constructed as described above, the film or sheet 1 forming the recording layer having the concavo-convex pattern or pregroove for the signal and the transparent substrate 4 are placed in the outer peripheral portion 5a with the signal recording surface inside.

And the parts other than the recording part 5b (non-recording part) are bonded with adhesive, so that the recording part is adhered,
There are no unbonded parts and therefore no local air pockets. In addition, by being able to continuously form the recording layer 2 such as a concave-convex pattern of signals and pregrooves on the film or sheet 1, there is no need for batch processing in each process as in the past, which significantly reduces the manufacturing cost of optical cards. becomes possible.

As described above, the optical card of this embodiment has a recording layer 2 having a concavo-convex pattern or a pre-groove for signals on one side of a film or sheet 1, and a reflective film layer 3 formed thereon. The film or sheet 1 on which the reflective film layer 3 is formed is glued so that the signal recording surface is on the inside of the transparent substrate 4 at the outer peripheral portion 5a and the portion other than the recording portion 5b (non-recording portion). It is constructed by bonding them together using an adhesive.

Therefore, the following various effects can be obtained.

(a) A film or sheet 1 and a transparent substrate 4,
Since the parts other than the outer circumferential part 5a and the recording part 5b (non-recording part) are bonded together with adhesive, there is no adhesive or non-adhesive part in the recording part as in the conventional case, and therefore there is no partial air pocket. can occur,
It becomes possible to significantly improve the reliability of optical cards.

(b) Since the recording layer 2, such as the uneven signal pattern and pregroove, can be continuously formed on the film or sheet 1, it is no longer necessary to perform batch processing in each process as in the past, significantly reducing the manufacturing cost of optical cards. It becomes possible to do so.

In the above embodiments, a case has been described in which the recording layer 2 such as a concavo-convex pattern or a pre-groove for a signal is formed on one side of the film or sheet 1 by a heat press method, but the present invention is not limited to this, and for example, a roll press method, a 2P method, etc. recording layer 2 according to
may be formed.

Further, in the above embodiment, the case where the film or sheet 1 and the substrate 4 are bonded together using an adhesive is described, but the method is not limited to this, and for example, heat sealing method, impulse sealing method, ultrasonic sealing method, high frequency sealing method, etc. They may be bonded together by a heating method or the like.

Furthermore, the present invention can also be applied to an optical card capable of optically recording and reproducing signals. In this case, the aforementioned recording layer 2 is a film or sheet on which information can be optically recorded and reproduced. It may be constructed by laminating possible optical recording material layers.

[Effects of the Invention] As explained above, according to the present invention, in an optical card having a recording layer capable of optically recording or reproducing signals in at least a part of the card body, the recording layer is formed. The film or sheet is attached to the transparent substrate at the outer periphery and non-recording area, with the signal recording surface facing inside, reducing manufacturing costs and improving reliability. We can provide optical cards that can do this.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional configuration diagram showing one embodiment of an optical card according to the present invention, and FIGS. 2 to 4 are diagrams for explaining a method of manufacturing the optical card in the same embodiment. 1... Film or sheet, 2... Recording layer, 3...
...Light reflective film layer, 4...Substrate. Figure Figure Figure 4

Claims (3)

[Claims] (1) In an optical card that has a recording layer on at least a part of the card body that is capable of optically recording or reproducing signals, the film or sheet forming the recording layer is placed on a transparent substrate. An optical card characterized in that the outer peripheral portion and the non-recording portion are bonded together so that the signal recording surface is on the inside. (2) The signal recording surface of the film or sheet forming the recording layer is formed with a concavo-convex pattern or a pre-groove for signals together with a light-reflecting film layer. light card. (3) The optical card according to claim (1), wherein the recording layer is formed by laminating an optical recording material layer capable of optically recording and reproducing information on a film or sheet. .