| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical scanner which can be made small in size and can be easily adjusted at manufacturing. SOLUTION: As for an optical scanner 200, four optical scanning units 201A to 201D are installed, the units 201A to 201D are composed of a light source part for emitting a luminous flux, a scanning inputting optical system for guiding the luminous flux emitted from the light source part to a deflector, a deflector for deflecting the luminous flux so as to scan with the flux, a scanning image forming optical system for condensing the luminous flux deflected by the deflector on a surface to be scanned as a beam spot are used, and one surface to be scanned is continuously scanned by cooperatively actuating the respective optical scanning units 201A to 201D. Respective scanning/image forming optical systems 18A to 18D among two adjacent optical scanning units 201A to 201D are provided with at least one lens 70 in common.
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