Patent ID: 8896650
Filing Date: 2014-11-25
Classification: G02B,G03G

Abstract:
1. A scanning optical apparatus comprising: a light source; a rotary polyhedron that has reflective surfaces for reflecting a light beam emitted from the light source, deflects the light beam emitted from the light source by moving the reflective surfaces, and scans the light beam on a surface to be scanned in a main scanning direction; a Beam Detect sensor to enter the light beam reflected by the reflective surface constituting the rotary polyhedron thereto; a light beam detecting unit for detecting, based on an output of the Beam Detect sensor, the light beam reflected by the reflective surface that is incident on the Beam Detect sensor; an optical sensor in the light source that is disposed on an optical axis of the light beam and on a side opposite to the light beam emitting side, on which the light beam reflected by the reflective surface is incident, and detects the intensity of the incident light beam; a return light beam detecting unit for detecting, based on an output of the optical sensor in the light source, the light beam reflected by the reflective surface that is incident on the optical sensor in the light source; a calculation unit for calculating a time interval between the time when the light beam detecting unit detects the light beam incident on the Beam Detect sensor and the time when the return light beam detecting unit detects the light beam incident on the optical sensor in the light source; and a scan adjusting unit for adjusting a luminescence time of the light source for scanning the light beam on the surface to be scanned, based on the time interval calculated by the calculation unit.