Exposure device including housing rotated about projection

Details Exposure device including housing rotated about projection Exposure device including housing rotated about projection

2007-02-27

2007-02-27

Pham, Hai (Department: 2861)

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Reexamination Certificate

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09955043

ABSTRACT:
An exposure device has a light emitting unit for emitting a laser beam based on an image signal. The laser beam emitted from the light emitting unit is incident on a polygon mirror through a cylindrical lens. The laser beam reflected on the polygon mirror is illuminated on the surface of a photo sensitive drum through two fθ lenses and a mirror. By doing so, an electrostatic latent image is formed on a drum surface on the basis of an image signal. Further, the exposure device has a housing for holding the light emitting unit, cylindrical lens, polygon mirror, fθ lenses and mirror in a mutually and highly accurate state. A dowel is so provided as to project from the bottom of the housing and functions as a rotation shaft for rotating the exposure device. The dowel is provided on an axis passing through an exposure light spot illuminated in the drum surface by the laser beam.

REFERENCES:
patent: 4265524 (1981-05-01), Compton et al.
patent: 4903067 (1990-02-01), Murayama et al.
patent: 5151811 (1992-09-01), Makino
patent: 6243128 (2001-06-01), Yamakawa
patent: 04249211 (1992-09-01), None
patent: 05119276 (1993-05-01), None
patent: 10-197815 (1998-07-01), None
A partial English translation of JP 4-249211.

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