Objective optical system for endoscopes

Details Objective optical system for endoscopes Objective optical system for endoscopes

1990-04-18

1992-02-11

Arnold, Bruce Y.

Optical: systems and elements

Lens

With variable magnification

359691, 359708, G02B 904

Patent

active

050879898

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 the lens units. This objective optical system for endoscopes has distortion of a small absolute value, a distortion curve of natural shape, favorably corrected aberrations, and is composed of lens elements easily manufacturable.

REFERENCES:
patent: 4403837 (1983-09-01), Nakahashi

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