Objective optical system for endoscopes

Details Objective optical system for endoscopes Objective optical system for endoscopes

1991-11-14

1993-03-30

Sugarman, Scott J.

Optical: systems and elements

Lens

Microscope objective

359659, 359714, 359715, 359770, 359783, G02B 2102, G02B 1318, G02B 960, G02B 934

Patent

active

051989310

ABSTRACT:
An objective optical system for endoscopes consisting, in the order from the object side, of a front lens unit having negative refractive power, an aperture stop and a rear lens unit having positive refractive power and comprising at least one aspherical surface in each of said lens units. This objective optical system for endoscopes has distortion of a small absolute value, a distortion curve of natural shapes, favorably corrected aberrations, and is composed of lens elements easily manufacturable.

REFERENCES:
patent: 4403837 (1983-09-01), Nakahashi
patent: 4867546 (1989-09-01), Nishioka et al.

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