| 摘要 |
PROBLEM TO BE SOLVED: To obtain a device where the device cost of an optical system does not rise even when the number of beams is increased in a plural-beam scanning system by providing plural light beam generation means arrayed in a grating state on a plane and inclining arrayed light sources to a scanning direction by an angle satisfying a specified condition. SOLUTION: Assuming that the number of the light sources arrayed in the scanning direction is N, an interval between the light sources in the scanning direction is A and an interval between the light sources in a subscanning direction is B, the arrayed light sources are inclined to the scanning direction byθsatisfying tanθ=B/NA. The light sources are arrayed in the two-dimensional grating state and arranged on a base 10. The beam light generated from the light source passes a collimator lens 11 and is turned into parallel beams, passes through a lens group 12 and is changed to the beam having specified width, and passes through a cylindrical lens 13 and is deflected by a rotary polygon mirror 14 so as to perform scanning. Then, it is formed into an image like a spot group 17 on a photoreceptor 16 by an Fθlens 15 so as to perform scanning, At such a time, the scanning is performed by inclining the light source by the angleθso that scanning pitch may be an equal interval.
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