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US 7,804,515 B2Granted
Image-forming device with scanner unit
AssigneeBrother Kogyo Kabushiki Kaisha
InventorsYasuo Tamaru, Hiroshi Igarashi, Yasushi Okabe
Life of this patent
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Abstract
An image-forming device includes: a housing; an endless belt; a plurality of process units; and a plurality of scanner units. Each scanner unit and each process unit are inclined obliquely to a vertical direction. At least a part of each process unit is inserted into and removed from the housing in an obliquely inclined direction.
Claims13
A scanner unit comprising:
- a scanner housing;
- a laser diode that is disposed at the scanner housing and emits a laser beam;
- a polygon mirror that is disposed at the scanner housing and deflects the laser beam from the laser diode in a scanner direction so that the laser beam deflected by the polygon mirror scans on a photosensitive drum;
- and
- at least one reflective mirror that is disposed at the scanner housing and that reflects the laser beam from the polygon mirror;
- a sensor that is disposed at the scanner housing and receives the laser beam from the reflective mirror;
- wherein the polygon mirror is located on an optical path of the laser beam between the reflective mirror and the sensor, and a rotational period and a rotational timing of the polygon mirror are set to ensure that while the laser beam falls incident on the reflective mirror, the angular edges of the polygon mirror will not be in the optical path.
4 more elements
A scanner unit comprising:
- a scanner housing;
- a first, second and third reflective mirror that are disposed in the scanner housing;
- a laser diode that is disposed in the scanner housing and emits a laser beam, the laser beam arranged to reflect off the first reflective mirror;
- a polygon mirror having angular edges, a reflective surface and being disposed in the scanner housing, the polygon mirror deflecting the laser beam from the first reflective mirror in a scanner direction so that the laser beam deflected by the polygon mirror scans on a photosensitive drum and reflects off the second reflective mirror onto the third reflective mirror,
- a sensor that is disposed in the scanner housing and receives the laser beam from the third reflective mirror;
- wherein the polygon mirror, located on an optical path of the laser beam between the third reflective mirror and the sensor, has a rotational period and a rotational timing which ensure that while the laser beam falls incident on the third reflective mirror, the angular edges of the polygon mirror are not in the optical path between the third reflective mirror and the sensor.
3 more elements
Dependencies are inferred from the claim text.