Patent ID: 9575431
Date: 2017-02-21
CPC Classifications: G02B,G03G

Claim:
1. An optical scanning apparatus comprising: a light source having a plurality of light-emitting points; a deflection unit with a first deflection surface configured to deflect a plurality of light fluxes emitted by the plurality of light-emitting points; a scanning optical system configured to guide the plurality of light fluxes deflected by the first deflection surface onto a scanned surface; and a synchronous detection unit configured to detect light fluxes from at least two light-emitting points deflected by the first deflection surface, wherein the synchronous detection unit has a plurality of imaging elements including first and second imaging elements made of materials different from each other, and wherein the first imaging element, of the plurality of imaging elements, exhibits a smallest change in refractive index with respect to temperatures and has a largest refractive power in a main scanning section.