JPH0695390B2 - Transmitted light reading type optical recording card - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Object of the Invention [Industrial field of application] The present invention relates to a transmitted light reading type optical recording card.

In recent years, cards that store various types of information, such as ID cards, cash cards, and bank cards, have become widespread.

[Prior Art] It is necessary to record various information such as personal data and data of the issuing company on this kind of card, and at the initial stage, such information is recorded with visible characters or symbols. In addition, at the stage described later, it is recorded by an electric signal using magnetism, but it is necessary to prevent alteration and cope with an increase in the amount of information.

Therefore, recently, an optical recording card applying a laser technique has been developed. This optical recording card comprises an information recording medium having an optical reflection surface.

As shown in FIG. 7, a conventional optical recording card 101 has recording pits 108 made of non-reflective ink formed on a card front substrate 102, an aluminum reflection layer 107 formed thereon, and a card formed thereon. It is configured by adhering the back substrate 103 via the adhesive layer 104. The card back substrate 103 is made of polyvinyl chloride, for example, and the card front substrate 102 is made of polycarbonate, for example. The optical recording layer 105 is composed of an aluminum reflective layer 107 and recording pits 108 made of non-reflective ink formed thereon. A surface hardened layer 106 is formed on the surface of the card surface base material 102.

The read light is introduced from the surface hardened layer 106 side, and "0" or "1" of the data is determined by the intensity ratio of the reflected light between the aluminum reflective layer 107 and the recording pit 108 to read the information.

[Problems to be Solved by the Invention] However, since the optical recording card 101 configured as described above detects reflected light, both the light source and the photodetector are arranged on the surface hardened layer 106 side. , It is necessary to detect the reflected light that is the total reflection of the incident light, but there is a drawback that the S / N ratio of the read signal decreases when the light is diffusely reflected by the minute unevenness of the surface on which the data pit pattern is formed, A solution to this point is desired.

The present invention has been made in view of the above circumstances, and is a transmitted light reading type optical recording capable of reducing the influence of the unevenness of the data pit pattern surface and obtaining a high S / N ratio. The purpose is to provide a card.

(B) Structure of the Invention [Means for Solving the Problem] To this end, a transmitted light reading type optical recording card of the present invention is a card having an optical recording section and is a light-transmitting optical card. A light-shielding pattern comprising a card front substrate having a recording portion forming region and a card back substrate having a light-transmitting optical recording portion forming region, which are bonded to each other so that the optical recording portion forming regions are aligned with each other. The optical recording member that forms a pit pattern depending on the presence or absence of the above is sandwiched between the optical recording portion forming region of the card front substrate and the optical recording portion forming region of the card back substrate. There is.

Hereinafter, details of the present invention will be described with reference to the drawings illustrating an embodiment.

In FIGS. 1 and 2, reference numeral 1 is an optical recording card. The optical recording card 1 has an optical recording unit 2. In the optical recording card 1, an optical recording member 7 is formed on an optical recording formation area 5 on the inner surface of a card front substrate 3, and a card back substrate 4 is attached by an adhesive 13 so as to cover the optical recording member 7. It is what you wear.

The card backing material 4 guarantees the strength of the optical recording card 1. Such card backing material 4 includes glass, acrylic, epoxy, polyester, vinyl chloride, polysulfone,
A synthetic resin plate such as a transparent resin such as polyether sulfone can be used, but may have a slight color,
Further, at least the optical recording formation area 6 is provided with a light transmitting property.

As the card surface base material 3, glass, acrylic, epoxy,
The optical recording forming area 5 corresponding to the optical recording forming area 6 is made of transparent material such as transparent resin such as polyester, vinyl chloride, polysulfone, and polyether sulfone. There is. The optical recording member 7 is formed on the card surface base material 3, and data pits 8 are formed.
It has a pattern of. The optical recording member 7 is made of Al, Ni,
Pattern of light-shielding metal thin film such as Co, Cr, Fe, Zn, Sn, Ti, Cu, Ag, Au, Pd, Rh is formed by vapor deposition or plating, or by printing offset, silk screen, letterpress, clavia, etc. It may be formed by patterning, or may be formed by a color filter manufacturing technique of etching a dyeing pattern or a colored layer, and further formed by a photographic technique such as exposure / development of a photographic emulsion or sticking of a photographic film.

As the adhesive 13, urethane, polyester, acrylic,
A transparent adhesive such as epoxy, vinyl chloride or vinyl acetate can be used.

Next, the manufacturing method for manufacturing the above optical recording card by an etching method will be described with reference to FIG.

First, a film 7a of an optical reflection material made of a material having a light-shielding property against reading light by vacuum deposition or the like on the card surface base material 3
Are formed (FIG. 3 (a)).

Next, a resist 11 is spin-coated on the film 7a (FIG. 3 (b)). The resist 11 may be a positive type or a negative type.

Next, resist mask 12 with a pattern of data pits
Exposure is performed by closely contacting with 11 (FIG. 3 (c)).

Next, the exposed resist 11 is developed. As a result, the transfer of the pattern to the resist 11 is completed, and minute holes corresponding to the data pits are formed in the resist 11. (FIG. 3 (d)).

Next, the film 7a is etched from above the resist 11. As a result, the portion of the film 7a not covered with the resist 11 is removed to expose the surface of the card front substrate 3, and the portion of the film 7a covered with the resist 11 is placed on the surface of the card front substrate 3. It remains with the resist in the vapor-deposited state (FIG. 3 (e)). This remaining portion constitutes the optical recording member 7 (Fig. 2). The resist 11 may be removed if necessary.

The optical recording member 7 cooperates with the card front substrate 3 to form the mask 12
The data pits of are reproduced and expressed. In this way, the optical recording member 7 is completed.

Next, the adhesive 13 is applied from above the resist 11 of the optical recording member 7 (FIG. 3 (f)), and adhered onto the card back substrate 4 (FIG. 3 (g)).

Finally, the optical recording card 1 is completed by punching into a prescribed card shape (FIG. 3 (h)).

Next, the reader for the above optical recording card will be described with reference to FIG.

In FIG. 4, reference numeral 21 is a reader, and the reader 21
Is provided with a light source side optical system 23 below the card passage 22 so as to form an optical path 20 penetrating the card passage 22.
A detection side optical system 24 is provided above 22.

The light source side optical system 23 has a light source 25 and a lens 26, and the detection side optical system 24 has a sensor 27 such as a line sensor and a lens 28.

[Operation] Next, the operation of the optical recording card 1 and the reading device 21 configured as described above will be described.

The optical recording card 1 to be read moves on the card passage 22. During this time, the reading light from the light source 25 passes through the lens 26, crosses the card path 22, passes through the optical recording section 2 of the optical recording card, passes through the lens 28, and is received by the sensor 27. Thus, the sensor 27 detects the presence or absence of light transmission from the data pit 8 and reads the data.

(C) Effect of the Invention In the optical recording card of the present invention configured as described above, since the reading of the optical recording unit is the transmissive reading, the influence of the surface smoothness of the formation of the data pattern is small, so that the S / N ratio is improved. Can be planned.

In addition, by using the transmissive reading method in this way,
The structure of the reading device is simplified and an inexpensive reading device can be obtained.

(D) Example FIG. 5 shows a transparent optical recording member having an optical data pit pattern having irregularities A formed on the surface thereof. The results of reading the pits with a similar transmission microscope and the results of reading the transmitted light with the CCD line sensor and the reflected light are shown, but when observing the transmitted light, the flaw A It has been shown that there is almost no effect.

(E) Other Embodiments FIG. 6 shows an optical recording card according to another embodiment of the present invention. The optical recording card 1a shown in FIG. 6 (a).
The optical recording member 7 is bonded to the card back substrate 4.

The optical recording card 1b shown in FIG.
Are formed on the surface of the base card 9 and the adhesive 13
Is sandwiched between the card front substrate 3 and the card back substrate 4.

The optical recording card 1c shown in FIG.
Is formed on the back surface of the base card 9 and the adhesive 13
Is sandwiched between the card front substrate 3 and the card back substrate 4.

The optical recording card 1d shown in FIG.
Are formed on both sides of the base card 9 and the adhesive 13
Is sandwiched between the card front substrate 3 and the card back substrate 4.

[Brief description of drawings]

1 is a perspective explanatory view of an optical recording card of the present invention, FIG. 2 is an enlarged cross-sectional explanatory view of an optical recording card of the present invention, FIG. 3 is a block diagram showing an example of a manufacturing method of the present invention, and FIG. Is an explanatory view showing the structure of the reading device of the present invention, and FIG. 5 is an explanatory view showing the influence of unevenness on the optical recording member on the reading light.
FIG. 6 is an enlarged sectional view showing an optical recording card according to another embodiment of the present invention, and FIG. 7 is an enlarged sectional explanatory view of a conventional optical recording card. 1 ... Optical recording card, 2 ... Optical recording section, 3 ... Card front substrate, 4 ... Card back substrate, 5 ... Optical recording formation area, 6
...... Optical recording formation area, 7 ...... Optical recording member, 7a ...... Film, 8
...... Data pit, 11 ...... resist, 12 ...... mask, 13
...... Adhesive, 20 ...... Optical path, 21 ...... Reading device, 22 ...... Card path, 23 ...... Light source side optical system, 24 ...... Detection side optical system,
25 …… light source, 26 …… lens, 27 …… sensor, 28 …… lens

Claims (1)

[Claims] 1. A card front substrate having a light-transmitting optical recording portion forming region, and a card backing substrate having a light-transmitting optical recording portion forming region. An optical recording member which is provided by adhering each of the optical recording section forming regions in a coincident manner and forming a pit pattern depending on the presence or absence of a light shielding pattern and the optical recording unit forming region of the card front substrate and the card back substrate. The optical recording card of the transmitted light reading type is characterized in that the optical recording card is attached to the optical recording portion forming region of