| 摘要 |
PROBLEM TO BE SOLVED: To record an original image as a hologram pattern without exerting an influence on a track guide function. SOLUTION: Plural track guides 221-226 and tracks 231-235 are formed on an information recording part of an optical card. The upper faces of the track guides are treated with surface roughening processing for reducing reflectance. An optical head recognizes the track guides based on the difference in the optical reflectance. Data are recorded as pits along the tracks. The track guides are divided into parts in a recording region R, and lots of island-like regions 221A,... are formed. A hologram pattern of a predetermined original image is expressed by a configuration of these lots of island-like pattern, and reproduced as the original image when observed by naked eyes. |
