| 摘要 |
PURPOSE:To obtain a dustproof plate of an optical unit which is rigid and durable with ease of manufacture by molding integrally a light transmitting part, a sliding piece to be engaged with the guide part of the optical unit in sliding contact therewith in the stage of attaching and detaching and a gripping part to be gripped in the stage of attaching and detaching by using a light transmittable synthetic resin. CONSTITUTION:Laser light from a semiconductor laser 4 arrives at a rotary polygon mirror 6 via a collimator lens 5 and is changed continuously in the exit direction by said mirror, by which the laser light is oscillated in the scanning direction. The laser light irradiates a photosensitive body 14 via the dustproof plate 9 after the laser light is successively reflected by an ftheta lens L1, the 1st mirror 7 and the 2nd mirror 8. The semiconductor laser 4, the collimator lens 5, the rotary polygon mirror 6, the ftheta lens L1, the 1st mirror 7, the 2nd mirror 8, etc. are installed in a frame 15 which is the outside plate of the optical unit and the light is conducted through the dustproof plate 9 mounted in the aperture of the frame 15 to the body 14. The dustproof plate 9 has an I-shaped section and the light transmitting part 100, the sliding piece 200 and the gripping part 300 are integrally molded of the same material.
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