Patent ID: 8115980
Filing Date: 2012-02-14
Classification: G02B,H04N

Abstract:
1. A light scanning unit, comprising: a light source to emit a light beam; a beam deflector to deflect the light beam emitted from the light source, and form forward direction and reverse direction scanning lines on an image section and first and second non-image sections respectively disposed at opposite sides of the image section; a reflecting member, disposed at the second non-image section, to reflect the light beam input from the beam deflector; a light detector, disposed at the first non-image section, to receive a first light beam directly input from the beam deflector and a second light beam input via the reflecting member; a control unit to determine whether the scanning line is a forward direction scanning line or a reverse direction scanning line based on signals respectively corresponding to the first and second light beams detected in the light detector, and to control the light source so that a light beam comprising image information corresponding to a scanning direction of the scanning line can be emitted; and a synchronization adjusting unit to correct an alignment error between the forward direction scanning line and the reverse direction scanning line due to at least one of respective disposition tolerances of the light detector and the reflecting member and a resonance frequency change of the beam deflector correlating to a surrounding environment change.