Optical element, optical scanning device, and image forming...

Details Optical element, optical scanning device, and image forming... Optical element, optical scanning device, and image forming...

2011-01-18

2011-01-18

Harrington, Alicia M (Department: 2873)

Optical: systems and elements

Lens

With support

C359S819000

Reexamination Certificate

active

07872813

ABSTRACT:
An optical element having an optical surface and at least three convex portions on a surface different from the optical surface, wherein, among the at least three convex portions, two convex portions a space between whose centers is a maximum and one convex portion a length of a perpendicular from whose center to a straight line connecting centers of the two convex portions is a maximum satisfy a relationship of tan−1(h/p)≦a first specification value, wherein h is a greater one of heights of the optical element at centers of the two convex portions with reference to a tangential plane of the optical element at a position of a foot of the perpendicular, and p is a length of the perpendicular.

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