Endoscope objective lens and endoscope

Details Endoscope objective lens and endoscope Endoscope objective lens and endoscope

2011-03-15

2011-03-15

Martinez, Joseph (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S761000

Reexamination Certificate

active

07907352

ABSTRACT:
An endoscope objective lens includes, in order from an object side, a negative first lens, a first cemented lens, an aperture diaphragm, a positive fourth lens and a second cemented lens. The negative first lens has a concave surface directed to an image side. The first cemented lens is formed by cementing a second lens and a third lens. One of the second and third lenses is positive and. The other is negative. The positive fourth lens includes a flat surface or a surface having a larger absolute value in radius of curvature, directed to the object side. The second cemented lens is formed by cementing a positive fifth lens and a negative sixth lens in order from the object side. The second cemented lens has a positive refractive power as a whole. The endoscope objective lens satisfies the following conditional expressions (1) and (2).f2×v5-v6RA×(Bf+d6
6)>10(1)Bf/f>2.5(2)

REFERENCES:
patent: 5777797 (1998-07-01), Miyano
patent: 5936778 (1999-08-01), Miyano et al.
patent: 2004/0125469 (2004-07-01), Miyano
patent: 63-261213 (1988-10-01), None
patent: 2004-205779 (2004-07-01), None

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