| 摘要 |
Provided are a light-scanning optical system and light-scanning apparatus capable of presenting an image at high speed and with high quality so as to equalize spot sizes throughout an entire surface to be scanned and nullify curving of scanning line, and imageformlng apparatus using it The light-scanning optical system has a first optical system 2 for converting a beam emitted from light source 1 into a nearly parallel beam, a second optical system 4 for focusing the converted beam into a linear beam along the main scanning direction on a deflection facet of deflecting device 5, and a third optical system 9 for focusing the beam deflected by the deflecting device, on the surface to be scanned 8. In the light-scanning optical system, the third optical system has at least one lens, and the at least one lens is arranged so that in the main scanning section a symmetry axis of the lens in the main scanning direction is inclined relative to a normal to the surface to be scanned, so as to bring the end of the lens on the light source side away from the deflecting device.
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