Image pickup lens system

Details Image pickup lens system Image pickup lens system

2005-12-29

2009-02-17

Thompson, Timothy J (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S718000, C369S112240

Reissue Patent

active

RE040638

ABSTRACT:
An image pickup lens system includes a lens1of a meniscus shape having a first face as adelete-start id="DEL-S-00001" date="20090217" ?convexdelete-end id="DEL-S-00001" ?insert-start id="INS-S-00001" date="20090217" ?concaveinsert-end id="INS-S-00001" ?face, and a diaphragm2disposed on an object side of the lens1.The lens1meets the following conditions: Y′/fl equal to or larger than 0.6; Dt/Dc is equal to or smaller than 0.9 and equal to or larger than 0.5; and Ap2/Am2is equal to or larger than 0.9. Thus, even when an image pickup element is of a reduced size, a desired optical performance can be maintained, and it is possible to produce a lens easily with a back focal length ensured.

REFERENCES:
patent: 6353588 (2002-03-01), Ori
patent: 6542314 (2003-04-01), Kawabata et al.
patent: 6671105 (2003-12-01), Saito

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