| 摘要 |
PROBLEM TO BE SOLVED: To provide an excellent output image by accurately detecting the output of a signal of the start of write-in with a laser beam. SOLUTION: A synchronization detection light beam La is made incident from a scanning direction with an angleθ0 with respect to a left wall face 11a and a right wall face 11b. In this case, the generation of a variance in the synchronization detection signal is suppressed even when the synchronization detection luminous flux La is vertically deviated by setting the angleθ0 at 90 deg..
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