| 摘要 |
An optical scanning device is provided. The optical scanning device comprises a light source, a deflection mirror reflectively deflecting a light beam projected from the light source by performing a sine-wave oscillation, a scanning optical element causing the light beam reflectively deflected by the deflection mirror to scan a scanned surface at a substantially constant velocity, wherein the following conditional expression is fulfilled: 0.4<phimax/phi0<0.9/[(20/phi0)(¼)]. In this conditional expression, phi0 is an amplitude angle of the sine-wave oscillation of the deflection mirror, and phimax is a maximum rotational angle of the deflection mirror corresponding to an effective write width.
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