Objective lens system for endoscopes

Details Objective lens system for endoscopes Objective lens system for endoscopes

1989-05-03

1991-09-10

Arnold, Bruce Y.

Optical: systems and elements

Lens

Including a nonspherical surface

G02B 934, G02B 962, G02B 964, G02B 1318

Patent

active

RE0336890

ABSTRACT:
An objective lens system for endoscopes having favorably corrected distortion. Said lens system comprising a front lens group having negative refractive power and a rear lens group having positive refractive power, arranged in said front lens group is a lens component having an aspherical surface having portions whose curvature is increased as they are farther from the optical axis or decreases as they are farther from the optical axis.

REFERENCES:
patent: 4059344 (1977-11-01), Yamasita
patent: 4300817 (1981-11-01), Betensky
patent: 4400064 (1983-08-01), Ikemori et al.

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