Exposure device, LED print head, and image forming apparatus...

Details Exposure device, LED print head, and image forming apparatus... Exposure device, LED print head, and image forming apparatus...

2005-06-27

2008-08-26

Meier, Stephen D. (Department: 2853)

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

C347S236000

Reexamination Certificate

active

07417659

ABSTRACT:
A shape or position of a shielding member is set corresponding to an image focusing property of each rod lens element to prevent an MTF from deteriorating, to provide a clear exposure image, and to prevent a defective image such as having a vertical streak or the like, from occurring on a printed image. To achieve the above, an exposure device used for an image forming apparatus of an electrophotographic type, comprises a lens array having a plurality of lens elements for condensing light from a light source onto a photosensitive drum; and a shielding member for shielding at least one portion of a peripheral portion with respect to a direction of an optical axis of each lens element from the light radiated from the light source, wherein the shielding member has a shape or a position set depending on an image focusing property with each lens element.

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patent: 07072308 (1995-03-01), None
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patent: 20011255230 (2001-09-01), None
Katakura et al: “Simulation of Electrophotographic Process,” Oki Technical Review, Aug. 1998, vol. 64, pp. 89-92.

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