Single-focus lens for electronic still cameras

Details Single-focus lens for electronic still cameras Single-focus lens for electronic still cameras

2006-02-21

2006-02-21

Spector, David N. (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C348S342000, C359S784000

Reexamination Certificate

active

07002757

ABSTRACT:
A single-focus lens for an electronic still camera is formed of at least one meniscus lens element that is placed on the object side of a stop, with at least one surface of this meniscus lens element having a curvature such that light rays that pass through the stop are incident the surface substantially normally for all field angles, and an infrared-blocking coating is provided on the surface. Preferably, two specified conditions are satisfied to ensure that rays which are incident onto the coating are not adversely affected by the coating, thereby preventing color variations of objects which otherwise would occur.

REFERENCES:
patent: 6724547 (2004-04-01), Sato
patent: 6876500 (2005-04-01), Sato
patent: 6882483 (2005-04-01), Sato
patent: 6930841 (2005-08-01), Sato
patent: 9-289644 (1997-11-01), None
patent: 11-84232 (1999-03-01), None

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