Optical: systems and elements – Lens – With graded refractive index
Patent
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.
Olympus Optical Co,. Ltd.
Sugarman Scott J.
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