Photographing lens

Details Photographing lens Photographing lens

2005-07-12

2005-07-12

Spector, David N. (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S663000, C359S772000

Reexamination Certificate

active

06917479

ABSTRACT:
The present invention is directed to a photographing lens containing, in order from an object side: a first lens having a positive refractive power and a convex surface facing the object side; a second lens having a negative refractive power; a third lens having a positive refractive power; and a fourth lens having a negative refractive power and at least one aspheric surface, the photographing lens satisfying the following conditional expressions:LTf≤1.20.5≤f3f≤1.0where LTdenotes the distance on the optical axis between the object side of the first lens and the image side of the fourth lens; f denotes the total focal length of the photographing lens; and f3denotes the focal length of the third lens.

REFERENCES:
patent: 09-297264 (1998-11-01), None
patent: 10-293246 (1998-11-01), None

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