Scanning exposure device provided with intensity correction to compensate for scan angle
First Claim
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1. A scanning exposure device comprising:
- laser means for emitting a laser beam with a predetermined intensity;
a mirror for reflecting the laser beam emitted by said laser means;
a photoconductive means for receiving the laser beam reflected by said mirror;
a scanning exposure means for scanning the laser beam on said photoconductive means in accordance with a variation of an angular position of said mirror to deflect the laser beam, the laser beam impinging said mirror at an angle of incidence that varies with the angular position of said mirror; and
a correcting means for correcting the predetermined intensity of the laser beam so that an intensity of the laser beam on said photoconductive means is invariable regardless of a variation in a reflectance of said mirror due to a variation of the angle of incidence.
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Abstract
A scanning exposure device comprises a laser light source which emits a laser beam and a polygonal rotating mirror which reflects a laser beam emitted by the laser light source. The scanning exposure device scans the laser beam reflected by the polygonal rotating mirror on a surface of a photoconductive drum for exposure. The scanning exposure device is provided with an intensity correcting unit for correcting the intensity of the laser beam so that the intensity of the laser beam on the surface of the photoconductive drum does not vary regardless of variation of the incident angle of the laser beam falling on the polygonal rotating mirror as the polygonal rotating mirror rotates.
29 Citations
19 Claims
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1. A scanning exposure device comprising:
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laser means for emitting a laser beam with a predetermined intensity; a mirror for reflecting the laser beam emitted by said laser means; a photoconductive means for receiving the laser beam reflected by said mirror; a scanning exposure means for scanning the laser beam on said photoconductive means in accordance with a variation of an angular position of said mirror to deflect the laser beam, the laser beam impinging said mirror at an angle of incidence that varies with the angular position of said mirror; and a correcting means for correcting the predetermined intensity of the laser beam so that an intensity of the laser beam on said photoconductive means is invariable regardless of a variation in a reflectance of said mirror due to a variation of the angle of incidence. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A scanning exposure device comprising:
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a laser means for emitting a laser beam with a predetermined intensity; a mirror for reflecting the laser beam emitted by said laser means; a photoconductive means for receiving the laser beam reflected by said mirror; a scanning exposure means for scanning the laser beam on said photoconductive means by means of said mirror in accordance with a rotation of said mirror to provide a continuous variation of angular position of said mirror thereby producing a continuous variation of an angle of incidence of the laser beam on said mirror and deflections therefrom onto said photoconductive means; and a correcting means for correcting the predetermined intensity of the laser beam so that an intensity of the laser beam on said photoconductive means is invariable regardless of a variation of reflectance of said mirror, the variation in reflectance being based on the variation of the angle of incidence of the laser beam on said mirror. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification