Concentric lens with aspheric correction

Details Concentric lens with aspheric correction Concentric lens with aspheric correction

1999-05-21

2000-08-01

Ben, Loha

Optical: systems and elements

Single channel simultaneously to or from plural channels

By partial reflection at beam splitting or combining surface

359708, 359715, 359717, G02B 2714, G02B 1318

Patent

active

060975458

ABSTRACT:
A special concentric lens system having an air gap and at least one aspheric surface is provided to achieve a substantially uniform imaging performance in a wide angle of view with reduced aberrations.

REFERENCES:
patent: 4554459 (1985-11-01), Tsutsumi et al.
patent: 5166830 (1992-11-01), Ishibai et al.
patent: 5251069 (1993-10-01), Iizuka
patent: 5619380 (1997-04-01), Ogasawara et al.

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