Lens array, exposure device, and image forming apparatus

Details Lens array, exposure device, and image forming apparatus Lens array, exposure device, and image forming apparatus

2007-03-28

2009-12-08

Spector, David N (Department: 2873)

Optical: systems and elements

Lens

With graded refractive index

C359S652000

Reexamination Certificate

active

07630137

ABSTRACT:
A lens array has a plurality of rod lenses with optical axes in parallel with one another, in which the rod lens has a refractive-index distribution in a radial direction. The lens array has a radius ratio r0/r set to 0.9 or smaller, in which a radius r of the rod lens is set as the radius of the rod lens when the refractive-index distribution is formed, and in which a radius r0of the rod lens is set as the radius of the rod lens when all or part of an outer periphery of the rod lens is removed after formation of the refractive-index distribution.

REFERENCES:
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patent: 6366408 (2002-04-01), Kittaka et al.
patent: 6429977 (2002-08-01), Kittaka
patent: 7417659 (2008-08-01), Yamamura
patent: 2003-114306 (2003-04-01), None

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