| 摘要 |
The present invention has an object to provide a highly accurate optical scanner of a simple construction which permits reduction of jitter caused by a division error of the deflection surface of a polygonal deflector, and to provide a color image forming apparatus using the same. The optical scanner of the invention comprises a plurality of scanning units each having a polygonal deflector onto which a flux emitted from a light source is directed, and a scanning optical system which forms the flux reflection-deflected by the polygonal deflector into spots on a surface to be scanned. In the optical scanner of the invention, two or more scanning units commonly use a single polygonal deflector. The two or more scanning units use fluxes reflection-deflected on different deflection surfaces of the polygonal deflector, and the write timing of the two or more scanning units onto the surface to be scanned is determined by detecting fluxes from different deflection surfaces of the polygonal deflector by a single write position detector, and by using signals from that detector.
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