| 摘要 |
<p>PURPOSE:To obtain copiable optical information recording medium in a large quantity and at a cheap price without need of a wet type course by composing a recording layer so that information can be recorded by the difference in optical density between an exposure part and a non-exposure part based on selective exposure of ultraviolet light. CONSTITUTION:A light reflecting layer 12 consisting of Al vapor deposition film, a record layer 13 recording information and a protection layer 14 are set on the board of polyvinyl chloride, etc. The record layer 13 mixed materials indicating photochromisim by illumination of ultraviolet rays with benzothiazolin system spiropilan compound in high polymer binder to apply, dry up and from it on the light reflection layer 12. A color generating part 15a and a non- color generating part 15b are formed by selected exposure of ultraviolet rays to record information. Thus, copiable optical information recording medium can be obtained in a large quantity and at a cheap price without requesting a wet type course.</p> |
