| 摘要 |
PURPOSE:To prevent tensile force from operating on a piezoelectric element and to prevent the piezoelectric element from being broken down by interposing a light source or collimator lens by using two piezoelectric elements. CONSTITUTION:A beam emitted by a semiconductor laser light source 1 is collimated by the collimator lens 4 into a parallel light beam, which is deflected and scanned through a rotary polygon mirror 5, so that the scanning light is converged on an image plate 7' through a scanning lens 6. In this photoscanning device, the semiconductor laser light source 1 or collimator lens 4 is interposed by the two piezoelectric elements 3 and 3' arranged in parallel to the rotating shaft 10 of the rotary polygon mirror 5. Then, the direction of parallel light beam projection of the semiconductor laser light source 1 is displaced by those two piezoelectric elements 3 and 3'. |
