Optical systems

Details Optical systems Optical systems

1999-05-17

2000-12-12

Epps, Georgia

Optical: systems and elements

Lens

Selective magnification by exchanging or adding a lens...

359672, G02B 1502

Patent

active

061606685

ABSTRACT:
A switchable dual field of view objective system 20 comprises a front lens A and a rear lens C with an intermediate lens B switchable between in-use and out-of-use positions. Lens A is positively powered and lens C is negatively or positively powered but has little power in comparison to lens A. Lens C has two lens components 24, 25 of which component 24 is negatively powered and is located proximal to intermediate lens B. Lens B and component 24 are carried in common by a carrier 28 which is movable along the axis to provide distance focussing in both fields of view.

REFERENCES:
patent: 4148548 (1979-04-01), Thompson
patent: 4596447 (1986-06-01), Yamada et al.
patent: 4708442 (1987-11-01), Fujii et al.
patent: 5050971 (1991-09-01), Sato

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