Lens unit

Details Lens unit Lens unit

2007-02-27

2010-02-23

Choi, William C (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S762000, C359S764000

Reexamination Certificate

active

07667901

ABSTRACT:
A lens unit includes a front group, a stop, and a rear group, in order from the object side toward the image side. The front group includes at least: a first lens having a negative meniscus shape; a negative second lens formed from a plastic and having an aspherical surface; and a positive third lens, in order from the object side toward the image side. The rear group includes at least: a positive first lens; and a negative second lens, in order from the object side toward the image side.

REFERENCES:
patent: 2006/0028741 (2006-02-01), Kreitzer et al.
patent: 2006/0119959 (2006-06-01), Yamaguchi et al.
patent: 2005-227426 (2005-08-01), None

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