Compact wide-angle objective lens

Details Compact wide-angle objective lens Compact wide-angle objective lens

1996-04-24

1997-09-16

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359691, 359740, 359751, G02B 1514, G02B 900

Patent

active

056686692

ABSTRACT:
A wide-angle objective lens is comprised, from the object side, of a first lens component which is a negative meniscus lens having its convex surface facing the object side, a second lens component which is a meniscus lens having its convex surface facing the object side and having positive refractive power, a third lens component which is a cemented meniscus lens comprising a positive lens and a negative lens cemented together and having its convex surface facing the object side and having positive refractive power, a fourth lens component which is a positive meniscus lens having its concave surface facing the object side, and a fifth lens component which is a negative meniscus lens having its concave surface facing the object side. The wide-angle objective lens has a stop disposed between the second lens component and third lens component, and satisfies predetermined conditions.

REFERENCES:
patent: 3583791 (1971-06-01), Mori
patent: 4143945 (1979-03-01), Kubota
patent: 4747676 (1988-05-01), Hirakawa
patent: 5477388 (1995-12-01), Ishiyama et al.
patent: 5539582 (1996-07-01), Kohno et al.

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