Objective lens system for endoscope

Details Objective lens system for endoscope Objective lens system for endoscope

1996-05-16

1997-12-30

Nelms, David C.

Optical: systems and elements

Lens

Microscope objective

359644, 359659, 359737, 359739, 359783, G02B 2102, G02B 300, G02B 900, G02B 934

Patent

active

057037248

ABSTRACT:
An objective lens system for an endoscope comprises from the subject end to the image end a meniscus lens element of negative optical power having a concave image side surface, a plano-convex lens element of positive optical power having a convex subject side surface, an aperture element, a plano-convex lens element of positive optical power having a convex image side surface and a biconvex lens element of positive optical power.

REFERENCES:
patent: 4493537 (1985-01-01), Nakahashi
patent: 4984878 (1991-01-01), Miyano
patent: 5175650 (1992-12-01), Takayama et al.
patent: 5198931 (1993-03-01), Igarashi
patent: 5587839 (1996-12-01), Miyano et al.

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