Optical recording card with optical recording layers
AssigneeDai Nippon Insatsu Kabushiki Kaisha
InventorsMitsuru Takeda, Wataru Kuramochi
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Abstract
An optical recording material comprising (I) a substrate, (II) a recording layer provided on said substrate, the recording layer consisting of light transmissive portions and light screening portions, and (III) a reflective metallic thin film layer provided on the recording layer; as well as a process therefor. The invention also includes an optical card comprising the optical recording material provided on a card substrate. In the cases of the optical recording material and the optical card, it is possible to readily carry out high density recording, the alternation of written information is difficult, and the written information can be read out on a basis of the difference in light reflectivity.
Claims10
An optical card comprising an optical recording material provided on a card substrate, said optical recording material comprising (a) a substrate for the optical recording material, (b) a first recording layer provided at the lower surface of said substrate for the optical recording material, said first recording layer including light transmissive portions and light screening portions, said first recording layer comprising a photosensitive material including (i) a transparent resin as a binder, (ii) a photodecomposable development restrainer having a diazo or azido group, and (iii) a metal complex compound or a metal compound which is reduced to form metal nuclei, and (c) a second recording layer provided at the lower surface of said first recording layer, said second recording layer comprising a reflective metallic thin film onto which information can be written using said light transmissive portions and said light screening portions as track information, wherein said optical recording material is provided on said card substrate so that said second recording layer comes into contact with said card substrate.
Dependencies are inferred from the claim text.