| 摘要 |
PURPOSE:To obtain an optical card device where the access time is short and the recording and reproducing speed is high, by forming light sources and photosensors in arrays and recording and reproducing a required number of information bits by electric scanning mainly. CONSTITUTION:It is preferable that a recording light source 1 is a multilaser head where nXm-number of lasers 11 are arranged two-dimensionally at a pitch of several mum X several tens mum on a common substrate 11A. Each laser 11 has a columnar projection in the center of a plane plate part 12, and a laser beam is emitted from its front end in the direction of an arrow. Lasers to be lit are selected in accordance with recording information supplied to an input terminal 1 of a modulating circuit by the modulating circuit included in an encoder 20, and lasers to be lit or non-lit are determined as, for example, an 8-bit signal, and this signal is supplied to a scanning circuit 10. A current exceeding a threshold flows to lasers to be lit by a laser driving circuit included in the scanning circuit 10. |
