Patent ID: 6011250
Filing Date: 2000-01-04
Classification: B41J,H01S

Abstract:
A laser power detecting device, comprising:an optical system, provided in the optical path of a laser flux emitted from a laser light source, for guiding and emitting the laser flux;a deflector for deflecting and scanning the laser flux onto a photoconductive member;a beam splitter, provided between the optical system and the deflector, for splitting the laser flux emitted from the optical system to the deflector, a part of the split laser flux comprising a main flux, and a remaining part of the laser flux comprising a monitor flux; anda sensor for detecting the intensity of the monitor flux,wherein a condenser lens is positioned between the beam splitter and the sensor to converge the monitor flux onto the light receiving surface; andwherein the monitor flux emitted from the condenser lens is an out-of-focus condition when incident on the light receiving surface of the sensor.