Patent ID: 8436886
Filing Date: 2013-05-07
Classification: B41J,G02B,G03G

Abstract:
1. An optical scanning device, comprising: a light source that emits a light beam; a driving unit that drives the light source to modulate the light beam in units of a single dot; a deflecting unit that includes an oscillation mirror and deflects the light beam; and a scanning optical system that guides the light beam deflected by the deflecting unit to a scanning surface having an active writing area for forming an image, wherein the scanning optical system is configured to produce a static beam spot size that varies with the image height, wherein the static beam spot size is a beam spot size when an angle of the oscillation mirror is set in a static state so that the light beam becomes a predetermined image height, such that a scanning beam spot size, which is a beam spot size received on the scanning surface at each image height by light emission for one dot when the oscillation mirror is driven, is kept substantially constant; and the static beam spot size at a central image height is smaller than that at image heights at opposite ends of the active writing area.