| 摘要 |
PURPOSE:To move an image formation position forward and backward optionally by providing a storage means for storing frequency division information on laser light and a frequency divider which varies in frequency division ratio according to the output of the storage means, and modulating image information according to the output of the frequency divider. CONSTITUTION:When a photodetection signal is inputted from an optical detector, the outputs of an N frequency divider 41b and a counter 42 are cleared and when the optical detection signal falls, the N frequency divider 41 begins to divides the frequency of a 60MHz clock (a). When the output of N frequency divider 41 rises assuming that the output initial value of a PROM 43 is 0, the counter 41 counts the rise at the time of the rising and is started up. When the output of this counter 42 rises, the input address of the PROM 43 varies and the PROM 43 supplies '1' to the N frequency divider 41. When the N frequency divider 41 reaches a counted value 15, a carry signal C is outputted and inputted to its own -LD, and a load input '1' is loaded. Consequently, a laser light scanner which can moves the image formation position forward and backward optionally is realized without using any expensive delay line.
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