Objective lens system for endoscopes

Details Objective lens system for endoscopes Objective lens system for endoscopes

1991-04-10

1993-05-04

Arnold, Bruce Y.

Optical: systems and elements

Lens

Telecentric system

359671, 359747, G02B 1322

Patent

active

052087026

ABSTRACT:
An objective lens system for endoscopes comprising, in the order from the object side, a first lens component having a negative refractive power, a second lens component having a positive refractive power, an aperture stop arranged right after the second lens component, and a rear lens unit comprising a third lens component designed as a cemented doublet consisting of a lens element having a positive refractive power and a lens element having a negative refractive power. Said objective lens system for endoscopes has a wide field angle, a compact design, a small number of lens elements and favorably corrected aberrations.

REFERENCES:
patent: 4598980 (1986-07-01), Doi et al.
patent: 4662725 (1987-05-01), Nishioka
patent: 4674844 (1987-06-01), Nishioka et al.
patent: 4806001 (1989-02-01), Okabe et al.
patent: 5050974 (1991-09-01), Takasugi et al.

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