| 摘要 |
PROBLEM TO BE SOLVED: To prevent generation of interference fringes by forming an image exposure part which exposes images onto an image-recording material which is easy to interfere at a wavelength range of laser beams, and providing the image exposure part with a plurality of laser light sources of different wavelengths set to offset reflected lights from the recording material. SOLUTION: Lights emitted from laser light sources 50, 200 of different wavelengths set to offset reflected lights from a recording material A become overlapping beams of the same phase through a polarization beam splitter 202 and enter a polygon mirror 54 through a reflecting mirror 204. Laser beams deflected here are projected along a main scan direction (b) via an fθlens 56 and a cylindrical mirror 58. A driver 52, the polygon mirror 54 and a feed motor 206 are controlled to drive in accordance with an image signal at this time. Accordingly, while the laser beams are scanned in the main scan direction (b) of the recording material A, the recording material A is sent in a sub scan direction (a), whereby an image is formed.
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