Patent ID: 8570620
Filing Date: 2013-10-29
Classification: G02B

Abstract:
1. A light scanning unit comprising: a light source to emit a light beam; an optical deflector to deflect and scan the light beam emitted from the light source in a main scanning direction; a first optical unit comprising a single lens to collimate the light beam emitted from the light source in the main scanning direction and focus the light beam onto a reflection surface of the optical deflector in a sub scanning direction, the first optical unit being disposed between the light source and the optical deflector; and a second optical unit comprising at least one lens to image the light beam deflected and scanned by the optical deflector onto a scanning target surface, wherein the following expression is satisfied in order to reduce a tolerance sensitivity in the sub scanning direction, where, βm represents a magnification of an optical system of the light scanning unit in the main scanning direction, and βs represents a magnification of the optical system of the light scanning unit in the sub scanning direction.