JPH04368643A - Optical card and production thereof - Google Patents

Abstract

PURPOSE:To provide the optical card which is nearly uniform in thickness and is low in production cost. CONSTITUTION:A light absorptive printing layer 11 printed with a coating material which exhibits a low reflectivity in the wavelength region to be used for recording and reproducing of information is formed on a card substrate 10 of the optical card 1. A film body 14 and a recording layer 13 are laminated so as to coat this layer. The light absorptive printing layer 11 is printed simultaneously with display symbols 12, such as logogram.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical card for optically recording and reproducing information.

0002

2. Description of the Related Art As shown in FIG. 3, a conventional optical card 2 includes a card substrate 21 made of plastic or the like, and a film body 2.
2. It has a structure in which a light absorption layer 23, a recording layer 24, a transparent body 25, and a protective layer 26 such as a laminate film are laminated.

To record on the optical card 2 having such a configuration, pits are formed in the recording layer 24 by irradiating a recording light beam modulated according to the signal to be recorded.

[0004] Furthermore, when reproducing the optical card 2, a reproducing light beam 3 is irradiated, and a photodetector detects an optical signal modulated by a diffraction phenomenon caused by pits recorded in the recording layer 24.

[0005] Here, the light absorption layer 23 prevents the reading light such as a laser beam that has passed through the recording layer 24 from being scattered by the substrate 21 and returns to the photodetector of the recording/reproducing head, resulting in noise when reproducing information. This is to prevent

[0006]

However, conventional optical cards require a manufacturing process to separately provide the light absorption layer 23, leading to an increase in manufacturing costs. In addition, the recording layer 24
The light absorption layer 23 and the film body 2 provided at the lower part of the
The thickness of the recording layer 24 cannot be ignored, and as shown in FIG. Therefore, it becomes a hindrance when the optical card is clamped to the optical card recording/reproducing device, and has the disadvantage that accurate positioning and correction of warpage are difficult.

[0007] Furthermore, since the recording layer 24 becomes thick,
The surface of the recording layer 24 is easily scratched during transportation, making it difficult to improve the reliability of the optical card.

An object of the present invention is to provide a highly reliable and inexpensive optical card.

[0009]

[Means for Solving the Problems] The optical card according to claim 1 is an optical card for optically recording and reproducing information, and comprises:
a substrate, a light-absorbing printed layer formed on the substrate and using a paint having low reflectance in the wavelength range of light used for recording and reproducing information, and a recording layer covering the surface of the light-absorbing printed layer. It is characterized by comprising:

[0010] The method for manufacturing an optical card according to claim 2 comprises:
A method for manufacturing an optical card for optically recording and reproducing information, the method comprising: a light-absorbing printing layer using a paint having low reflectance in the wavelength range of the light used to record and reproduce display symbols and information; It is characterized by having a first step of printing on a substrate and a second step of forming a recording layer to cover the light-absorbing printed layer.

[0011]

According to the optical card according to the first aspect of the present invention, a paint having a low reflectance in the wavelength range of light used for recording and reproducing information is applied as a light absorption layer on the substrate.

According to the optical card manufacturing method of the second aspect, the light-absorbing printing layer is printed on the substrate at the same time as other symbols are printed.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view showing the structure of an embodiment of an optical card of the present invention.

In the figure, on a card board 10 made of plastic or the like, there are display symbols 12 such as logos,
The light-absorbing printed layer 11 is printed with a paint having a low reflectance in the wavelength range of light used for recording and reproducing information. Further, a film 14 is laminated to cover the light-absorbing printing layer 11, and a recording layer 13 is further formed. Further, a transparent layer 15 and a protective layer 16 are formed to cover the entire substrate 10, thereby forming the optical card 1.

FIG. 2 is a sectional view of the optical card 1 shown in FIG.

[0016] In the above structure, since the light-absorbing printing layer 11 uses a paint having a low reflectance in the wavelength range of light used for recording and reproducing information, the thickness is different from the original thickness of the display symbol 12 such as a logo. It can be made almost the same. In particular, by printing the entire surface of the substrate 10, including the back of the logo, the thickness of the card can be made uniform.

In order to manufacture the optical card 10, the substrate 10 is first placed on the work table, and then the display symbol 1 is placed on the work table.
Simultaneously with the step of printing 2, a light-absorbing printing layer 11 is printed using a paint having a low reflectance in the wavelength range of light used for recording and reproducing information. After that, the film body 14,
The recording layer 13 and the transparent layer 15 are bonded together, and finally the protective layer 16 is formed.

[0018]

As described above, according to the optical card according to claim 1 of the present invention, a light-absorbing printing layer using a paint having a low reflectance in the wavelength range of light used for recording and reproducing information is provided. Since the card is formed on the substrate, the thickness of the card is almost uniform, and the clamping effect is stable when clamping the card to a recording/reproducing device. Furthermore, since the thickness is made uniform, the recording layer alone is not easily damaged, and reliability is improved.

Further, according to the method for manufacturing an optical card according to claim 2 of the present invention, since the light-absorbing printing layer is printed at the same time as the step of printing display symbols such as logos, the light-absorbing printing layer is printed. This has the effect of eliminating the need for a separate process and reducing the manufacturing cost of the card.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the configuration of an embodiment of an optical card of the present invention.

[Figure 2] Cross-sectional view of the optical card in Figure 1

[Fig. 3] A cross-sectional view showing the configuration of an example of a conventional optical card.

[Fig. 4] A cross-sectional view showing an enlarged partial configuration of the example shown in Fig. 3.

[Explanation of symbols]

10　Substrate 11 Light absorption printing layer 12 Logo (display symbol) 13 Recording layer 14 Film body 15 Transparent layer 16 Protective layer

Claims (2)

[Claims] 1. An optical card for optically recording and reproducing information, comprising: a substrate; and a paint formed on the substrate and having low reflectance in the wavelength range of light used for recording and reproducing information. An optical card comprising a light-absorbing printed layer and a recording layer covering the surface of the light-absorbing printed layer. 2. A method for manufacturing an optical card for optically recording and reproducing information, the method comprising: a display symbol to be displayed and a method for manufacturing an optical card using a paint having a low reflectance in the wavelength range of light used for recording and reproducing information; A method for manufacturing an optical card, comprising: a first step of printing an absorbent print layer on a substrate; and a second step of forming a recording layer to cover the light-absorbing print layer.