| 摘要 |
PROBLEM TO BE SOLVED: To provide a highly decorative effect by including a board having an image recognizable by human eyes in a laminated substrate contained in a transparent cartridge to reduce the mistaking use of an optical recording medium. SOLUTION: An image recognizable by human eyes is formed in a cover board 22 by the recessed and projected parts of a board inside an optical recording medium. That is, pit-by-pit sequential exposure is performed while rotating a glass original disk coated with photoresist by a laser beam recorder, the photoresist is developed after the exposure of almost full surface, and an image pattern having recessed and projected parts is formed. Since a light reflecting state is different between the area of repeated recessed and projected parts and the area of no such parts, the area of the repeated recessed and projected parts is seen to be different by bare eyes. For example, the expanded black part of a character M is like an image pattern 32. This image pattern 32 is a collection of pits 31, and the pits 31 are arrayed in plural columns. |
