| 摘要 |
Disclosed is a multi-beam optical system that includes a laser source, a diffractive beam dividing element that divides the light beam emitted from the laser source into a plurality of light beams, a propagation optical system through which the divided light beams propagate, a polygon mirror and a scan lens. The propagation optical system includes a curved surface mirror that is arranged such that center axes of the reflected light beams are spatially separated from center axes of the incident light beams at a predetermined separation angle. The diffractive beam-dividing element Is arranged such that the center axis of the incident light beam is inclined with respect to the normal to a diffraction grating surface thereof so as to compensate bending of a beam spot line, along which the beam spots align, depending on the separation angle of the curved surface mirror.
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