Objective lens system for endoscopes

Details Objective lens system for endoscopes Objective lens system for endoscopes

1992-10-15

1994-10-25

Sugarman, Scott J.

Optical: systems and elements

Lens

With graded refractive index

G02B 2300

Patent

active

053594568

ABSTRACT:
An objective lens system for endoscopes comprising, in order from the object side, a front lens unit having a negative refractive power, an aperture stop and a rear lens unit having a positive refractive power. This objective lens system is compact, comprises a small number of lens elements and favorably corrected aberrations, especially chromatic aberration, owing to a fact that at least one graded refractive index lens component is used in the front lens unit or the rear lens unit.

REFERENCES:
patent: 4755029 (1988-07-01), Okabe
patent: 4988172 (1991-01-01), Kanamori et al.

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