Objective lens system for endoscopes

Details Objective lens system for endoscopes Objective lens system for endoscopes

1993-04-27

1995-05-23

Ben, Loha

Optical: systems and elements

Lens

Including a nonspherical surface

359740, 359784, G02B 1318

Patent

active

054186498

ABSTRACT:
An objective lens system for endoscopes comprising, in order from the object side, a first lens unit having a negative refractive power, an aperture stop, a second lens unit having a positive refractive power and a third lens unit having a positive refractive power, and using an aspherical surface adopted as an image side surface of the second lens unit or an object side surface of the third lens unit. The objective lens system is of a nearly telecentric retrofocus type, composed of a small number of lens elements and compact.

REFERENCES:
patent: 5087989 (1992-02-01), Iganashi
patent: 5175650 (1992-12-01), Takayama et al.
patent: 5223982 (1993-06-01), Suzuki et al.

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