Projecting lens system

Details Projecting lens system Projecting lens system

2007-12-18

2009-12-01

Collins, Darryl J (Department: 2873)

Optical: systems and elements

Lens

With field curvature shaping

C359S649000, C359S774000

Reexamination Certificate

active

07626764

ABSTRACT:
A projecting lens system includes a first lens positive in power, a second lens negative in power, a third lens positive in power, and a fourth lens positive in power. The projecting lens system meets a criteria of 1.4<TT/f<1.7; where TT denotes a total length of the projecting lens system and f denotes an effective focal length of the projecting lens system.

REFERENCES:
patent: 4484802 (1984-11-01), Kikuchi
patent: 4695136 (1987-09-01), Schitthof
patent: 7206143 (2007-04-01), Kamo et al.
patent: 2002/0001136 (2002-01-01), Takahashi et al.
patent: 2003/0048547 (2003-03-01), Schuster
patent: 2005/0024748 (2005-02-01), Amanai
patent: 2006/0245079 (2006-11-01), Yamamoto et al.
patent: 2007/0008625 (2007-01-01), Park et al.

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