Photographic lens system and electronic imaging device using...

Details Photographic lens system and electronic imaging device using... Photographic lens system and electronic imaging device using...

2009-09-14

2010-10-05

Dinh, Jack (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S754000, C359S740000, C359S683000

Reexamination Certificate

active

07808723

ABSTRACT:
A photographic lens system includes a positive lens element, a positive lens element, a negative lens element having a concave surface facing toward the image, a diaphragm, a negative lens element having a concave surface facing toward the object, a positive lens element which is cemented to the negative lens element, and two or three positive lens elements, in this order from the object. An intermediate negative lens element, having the weakest negative refractive power out of all of the negative lens elements, is provided between the negative lens element having the concave surface facing toward the image and the negative lens element having the concave surface facing toward the object.

REFERENCES:
patent: 5835286 (1998-11-01), Yamanashi
patent: 2007/0177865 (2007-08-01), Nomura et al.
patent: 2007/0183769 (2007-08-01), Ishizuka
patent: 6-242370 (1994-09-01), None
patent: 7-159691 (1995-06-01), None
English language Abstract of JP 6-242370, Sep. 2, 1994.
English language Abstract of JP 7-159691, Jun. 23, 1995.

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