JP2642620B2 - Optical card - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to cash cards, credit cards, IDs
The present invention relates to an improvement in an optical card in which necessary information is written and read in a card or the like by optical recording and reproducing means.

[Prior art]

Optical recording, in which a thin film of a low melting point metal such as tellurium or bismuth is provided on a substrate, and a part of the thin film is irradiated with a laser beam or the like to cause a change in the recording and optically reproduce the recorded information. There is regeneration technology. The advantage of optical recording / reproducing technology is that the information density to be recorded is extremely high, so that the amount of information that can be handled is based on conventional magnetic recording / reproducing technology or IC.
It is significantly larger than the one that uses. Therefore, attempts have been made to apply the optical recording / reproducing technology to various cards. However, when information is recorded on a card in the above-mentioned optical recording technology, information must be written on the card one by one with a laser beam, and the amount of work is enormous and is not suitable for mass production. There has been a demand for the development of an optical card that can be easily mass-produced and has low cost so that this technology can be put to practical use for cash cards, credit cards, ID cards, and the like that have a large number of issued cards. The applicant has invented an optical card that meets the above demand,
It has already been proposed (Japanese Patent Application No. 60-283268). The optical card is formed by laminating a metal thin film layer for recording an optical information pattern, a protective layer, and a cured resin layer on a card base material. The formation of an information pattern common to each card is collectively performed by etching the photoresist layer, and the unique information pattern is written by a laser beam for each card, thereby enabling mass production of low-cost optical cards. It was realized. However, during the trial process of the optical card, it has been experienced that an error in writing or reading information occurs. Investigation into the cause revealed that the surface of the optical card could be scratched or dust adhered to it over a long period of carrying and frequent handling, and this would hinder optical operation.

[Problems to be solved by the invention]

It is an object of the present invention to mass-produce optical cards such as cash cards, credit cards, ID cards, etc., which optically record and reproduce data, at low cost. An object of the present invention is to provide an optical card that prevents scratches and dust from adhering and does not cause an error in writing or reading information.

[Means for Solving the Problems]

As shown in FIGS. 1 and 2, the optical card of the present invention is provided with a printed layer on the front surface of a card substrate 1 made of polyvinyl chloride and a magnetic recording layer on the back surface. An optical recording layer 4 made of a thin film of Te oxide for recording an optical information pattern 3, an optical information pattern protective layer 5 made of a polycarbonate resin, and a surface protective layer made of a silicone cured resin and subjected to an antistatic treatment with a surfactant. 6 and the information common to a plurality of cards is
This is an optical card formed in advance on a Te oxide thin film layer by photoetching.

[Operation]

Since the optical card of the present invention is provided with a cured resin layer subjected to antistatic treatment on the front surface or the front and back surfaces, the card is less likely to be damaged when the card is carried or used. Therefore, it is also possible to prevent dust from being clogged with the wound. In addition, since static electricity does not occur, dust can be prevented from adhering. Among information to be recorded on the optical card, information common to a plurality of cards can be recorded in advance by photoetching the Te oxide thin film layer at the time of card production, and mass production is easy. On the other hand, information unique to each card is recorded by causing a phase transition in the Te oxide thin film layer by a laser beam.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

 The material of the card base material is the same as that of a conventional magnetic card.
And a hard polyvinyl chloride resin is used. Colored
White paper is appropriate for printing.
You. If you need resistance to bending,
As a laminated material, such as reinforcing with ropes, woven fabrics or woven fabrics
Is also good. Te oxide thin film layer can be formed by vapor deposition, sputtering, etc.
Is formed. Its thickness is 200Å to 10,000Å, preferred
Or 1,000Å to 5,000Å. For forming a Te oxide thin film layer for recording optical information patterns
Means that Te oxide is applied to the surface of the card base or the back of the protective layer.
The thin film layer and the photoresist layer are laminated,
After exposure through a mask, develop and etch
Write common information on the card. Photoresist
The layer is made of a common photoresist material and roll-coated.
It may be formed by applying an arbitrary method such as a printing method. Etch
May be performed according to a conventional method. Optical information pattern protection layer made of polycarbonate resin
Protects the Te oxide thin film layer of the card. Security
The characteristics required for the protective layer are high transparency and smoothness.
And that there is no unevenness in thickness. Most preferred
Polycarbonate resin film as protective layer material
Used. A suitable thickness is on the order of a few μm to 800 μm. Adhesive strength with other materials to be laminated on the surface of the protective film
To improve corona discharge, plasma treatment, etc.
Physical treatment, oxidation treatment with acid,
Which processing should be performed as needed. Furthermore, on the protective layer, it is possible to reproduce the optical information pattern of the lower layer.
As long as there is no problem, a printing layer may be provided. The silicone cured resin layer can be used when carrying or using the card.
Scratches and accompanying contaminants in the wounds
To prevent optical card durability, recording accuracy and
Improve raw accuracy. As a material for the cured resin layer,
It is important not to degrade the properties of the protective layer,
Here, a silicone cured resin is used as the material. Antistatic agents include cationic, anionic and nonionic
Uses selected from on- and amphoteric surfactants
Can be Cationic, especially quaternary ammonium
Surfactants consisting of salts are preferred. Quaternary ammonium
Specific examples of salts include didodecyldipropylammonium
Mubromide, octylcyclohexyl dimethyl ammonium
Um chloride, and also has a cationic amide group
And quaternary ammonium salts. Detergent
Antistatic treatment, kneading the surfactant into the cured resin layer
Or form a thin film layer on the surface.
U. When reading with reflected light, as shown in FIG.
It is only necessary to provide a cured resin layer 6 having an antistatic treatment on its surface.
No. When reading with transmitted light, as shown in FIG.
Hardened resin layer 6 with antistatic treatment on both sides
Is provided. To bond between the card substrate and the layer above it
Use an adhesive if necessary. Write optical information pattern
The area of the Te oxide thin film layer to be recorded is smaller than the protective layer
If the protective layer and the card substrate are in direct contact and
is there. Therefore, the adhesive is used between the card substrate and the Te oxide thin film layer.
In addition to the adhesion of the protective layer,
You. Specific examples of adhesives include epoxy, urethane,
Acrylic or cyanoacrylate
You. There are various modes in the manufacturing process of the optical card of the present invention.
To explain them, first, FIG. 1 and FIG.
Cured resin layer on the surface of protective layer 5
6, the optical information pattern 3 is written on the back surface of the protective layer 5.
Forming a Te oxide thin film layer 4 to be recorded,
There is a manufacturing method of attaching, in this case, card base material
1 and a Te oxide thin film layer 4 for recording an optical information card 3
An adhesive layer 2 is provided between them. Undercoat between the Te oxide thin film layer 4 and the protective layer 5
A layer (not shown) may be provided. Further, the protective layer 5
And the cured resin layer 6 subjected to antistatic treatment, and
Between the card base material 1 and the cured resin layer 6 subjected to the antistatic treatment
A primer layer (not shown) may be provided between the layers.
No. Hereinafter, the optical card of the present invention will be described with a specific example. On the surface of a 400μm thick transparent polycarbonate sheet
Undercoat agent "Primer PC-4" (Shin-Etsu Chemical)
Apply by the gravure method
Lubricants "X12-2150A" and "X-12-2150B" (Shin-Etsu Chemical
10) mixture by gravure method
Heat for 0 minutes to form a cured resin layer, and further increase the surface activity
Statiside® (Analytical Chemicals, USA)
Laboratory of Skokie Co., Ltd.)
Was prepared. The back side of this sheet is subjected to freon washing, followed by a temperature of 80 ° C.
After heat treatment for 30 minutes at a temperature, a tellurium oxide thin film layer is formed.
Was. Next, a photoresist is applied to the surface of the Te oxide thin film layer.
"WAYCOAT HPR204 ”(Fuji Hunt Electronics
Knology) with a roll coater and a dry thickness of 1
μm and prebaked at 100 ℃ for 20 minutes
To form a photoresist layer. As an exposure mask, optical information
Use the mask on which the turn is written, and
UV irradiation from above the mask
To perform pattern exposure. After exposure, the developer “LST” (Fuji Hunt Electronics
Technology) to remove the exposed photoresist.
It was dissolved and removed. Subsequently, post-bake at a temperature of 100 ° C for 20 minutes.
King, etchant (16 parts phosphoric acid, 2 parts acetic acid, 1 part nitric acid
And 1 part of water. In each case, the part indicates a capacitance part. )
Immerse for 3 minutes to remove the exposed portion of the Te oxide thin film layer,
Formation of Te oxide thin film layer with patterned information pattern
did. On the other hand, a white rigid polyvinyl chloride sheet with a thickness of 300 μm
Is printed by offset printing on the front side, and magnetic
A sheet provided with a tripe by a transfer method was prepared. The surface of this sheet and the Te of the polycarbonate sheet
Acrylic resin-based
Laminated with a heat-sensitive contact agent.
The optical card material was formed by pressure bonding using a tool. Next, this material is punched into a card shape with a punching die,
An optical card that does not hinder writing or reading was obtained.

【The invention's effect】

The optical card of the present invention is prevented from being damaged when being carried or used, and is also prevented from adhering dust, so that no error in writing or reading of information occurs and durability is improved. It is excellent. This optical card is
Since the above-mentioned already proposed invention that an information pattern common to all cards is performed by an etching method can be used, it is possible to enjoy the advantage that the mass production is easy and the cost is low.

[Brief description of the drawings]

1 and 2 are schematic cross-sectional views each showing an example of the optical card of the present invention. DESCRIPTION OF SYMBOLS 1 ... Card base material 2 ... Adhesive layer 3 ... Optical information pattern 4 ... Te oxide thin film layer 5 ... Optical information pattern protective layer 6 ... Cured resin layer subjected to antistatic treatment

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-60-167142 (JP, A) JP-A-59-77647 (JP, A) JP-A-57-70694 (JP, A) JP-A-59-77694 193559 (JP, A) JP-A-60-113341 (JP, A) JP-A-59-194131 (JP, U)

Claims (2)

(57) [Claims] 1. A card substrate made of polyvinyl chloride, having a printed layer provided on the front surface and a magnetic recording layer provided on the back surface, but comprising a Te oxide thin film for recording an optical information pattern on the printed layer. An optical recording layer, an optical information pattern protective layer made of a polycarbonate resin, and a surface protective layer made of a silicone cured resin and subjected to an antistatic treatment with a surfactant are laminated, and information common to a plurality of cards is described by the Te.
An optical card formed in advance by photoetching on an oxide thin film layer. 2. The optical card according to claim 1, wherein an adhesive layer is provided between the card base material or the printing layer and the Te oxide thin film layer.