Aspherical lens with grating

Details Aspherical lens with grating Aspherical lens with grating

2006-07-25

2006-07-25

Thompson, Timothy (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S719000, C359S721000, C369S112260

Reexamination Certificate

active

07082000

ABSTRACT:
An aspherical lens (10, 10′) has an aspherical surface (101, 101′) and an opposite flat surface (102, 102′). A multiple-step grating is defined in the flat surface by a photolithographic method. The aspherical lens has a reduced chromatic aberration effect, and can thus provide a clear image. Furthermore, an effect of the aspherical lens having the grating is equivalent to that of a conventional aspherical lens unit. Thus, when the aspherical lens is used in an optical system, it can reduce a bulk and a weight of the optical system.

REFERENCES:
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patent: 5557472 (1996-09-01), Ito
patent: 5861999 (1999-01-01), Tada
patent: 6344935 (2002-02-01), Maruyama
patent: 6493143 (2002-12-01), Kato
patent: 2002-277732 (2002-09-01), None

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