| 摘要 |
PURPOSE:To use an image forming optical system with the resolving power of the optical system being lowered, by scanning numerous lines of recording tracks in plural steps. CONSTITUTION:A laser card 11 is provided with a stripe-like optical recording section 12. In the optical recording section 12, numerous recording tracks 13 are arrayed at regular very small pitches and recorded bits 14 are formed by means of laser lights. The recording tracks 13 are scanned in plural steps and recorded information is read. |
