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US 6,320,690 B1Granted
Scanning optical apparatus and laser scanning apparatus
AssigneeMinolta Co., Ltd.
InventorYoshihiro Inagaki
Life of this patent
Estimating the term…
Abstract
A scanning optical apparatus is provided with a light source for emitting a light beam, a deflector, and at least two reflecting surfaces. The deflector deflects the light beam emitted from the light source so that the light beam scans the scanned surface. Each of the two reflecting surfaces has an optical power both in the main-scanning direction and the sub-scanning direction and is not rotation-symmetric about an axis.
Claims21
A scanning optical apparatus comprising:
- a light source for emitting a light beam;
- a deflector for deflecting the light beam emitted from the light source so that the light beam scans a scanned surface;
- and
- at least two reflecting surfaces, of which each has an optical power both in a main-scanning direction and a sub-scanning direction, and of which neither is rotation-symmetric about an axis.
1 more element
A laser scanning apparatus comprising:
- a light source for emitting a laser beam;
- a polygonal mirror for reflecting and thereby deflecting the laser beam emitted from the light source, the polygonal mirror being rotatable about a predetermined axis of rotation;
- and
- at least two scanning mirrors for reflecting the laser beam deflected by the polygonal mirror so that the laser beam is focused onto a scanned surface, the scanning mirrors each having a reflecting surface that has an optical power both in a main-scanning direction and a sub-scanning direction and neither is rotation-symmetric about an axis.
1 more element
A laser scanning apparatus comprising:
- a light source for emitting a laser beam;
- a polygonal mirror for reflecting and thereby deflecting the laser beam emitted from the light source, the polygonal mirror being rotatable about a predetermined axis of rotation;
- and
- an imaging optical system for focusing the laser beam deflected by the polygonal mirror on a scanned surface while moving the laser beam at a substantially uniform speed across the scanned surface, the imaging optical system including two scanning mirrors each having a reflecting surface that has an optical power both in a main-scanning direction and a sub-scanning direction and neither is rotation-symmetric about an axis.
1 more element
Dependencies are inferred from the claim text.