Scanning optical device
AssigneeAsahi Kogaku Kogyo Kabushiki Kaisha
InventorsTadashi Minakuchi, Masahiro Oono, Mitsunori Iima, Hiroshi Kanazawa
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Abstract
A scanning optical device that includes a laser source that emits a laser beam; a deflector for deflecting a laser beam to form a scanning beam spot on an image surface; a beam splitter, between the laser source and the deflector, and a sensor positioned in a predetermined position relative to the beam splitter. In particular, the beam splitter includes a reflective area in which the laser beam from the laser source is reflected and a transmitting area that is distinct from the reflective area through which the laser beam is transmitted. One of the reflected laser beam or transmitted laser beam is a main beam to be deflected by the deflector and the other is a monitor beam to be detected by the sensor.
Claims21
A scanning optical device, comprising:
- a laser source that emits a laser beam;
- a deflector that deflects and scans said laser beam;
- a beam splitter, positioned between said laser source and said deflector, that comprises a reflective area in which said laser beam from said laser source is reflected and a transmitting area that is distinct from said reflective area through which said laser beam is transmitted, wherein one of said reflected laser beam and said transmitted laser beam is a main beam deflected by said deflector, an other of said one of said reflected light flux and said transmitted light flux being a monitor beam;
- and
- a sensor that detects an intensity of said monitor beam.
A scanning optical device, comprising:
- a laser source that emits a laser beam;
- a polygon mirror that deflects and scans said laser beam;
- a beam splitter, positioned between said laser source and said deflector, that divides said laser beam into a reflecting laser beam and a transmitting laser beam without being affected by a polarization of said laser beam, wherein one of said reflected laser beam and said transmitted laser beam is a main beam to be deflected by said polygon mirror, an other of said one of said reflected light flux and said transmitted light flux is a monitor beam;
- and
- a sensor that detects an intensity of said monitor beam.
Dependencies are inferred from the claim text.