Objective lens system for endoscope

Details Objective lens system for endoscope Objective lens system for endoscope

1995-10-17

1996-12-24

Sugarman, Scott J.

Optical: systems and elements

Lens

Microscope objective

359783, G02B 2102, G02B 934

Patent

active

055878393

ABSTRACT:
An objective lens system for an endoscope includes first to fifth lens elements L.sub.1 to L.sub.5 arranged in this order from the front to the rear. An aperture stop is disposed between the second and third lens elements L.sub.2 and L.sub.3. The first lens element L.sub.1 is a negative lens concave to the rear, the second lens element L.sub.2 is a positive lens having a flat surface facing rearward, the third lens element L.sub.3 is a positive lens having a flat surface facing forward, the fourth lens element L.sub.4 is a positive lens having a flat surface facing forward and the fifth lens element L.sub.5 is a negative meniscus lens. The fourth and fifth lens elements L.sub.4 and L.sub.5 are cemented together to form a cemented lens having a positive refracting power. The following formulae (1) to (3) are satisfied,

REFERENCES:
patent: 4493537 (1985-01-01), Nakahashi
patent: 4984878 (1991-01-01), Miyano
patent: 5198931 (1993-03-01), Igarashi

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