Variable-powered binoculars

Details Variable-powered binoculars Variable-powered binoculars

2005-03-22

2005-03-22

Nguyen, Thong Q (Department: 2872)

Optical: systems and elements

Compound lens system

Telescope

C359S410000, C359S407000, C359S643000

Reexamination Certificate

active

06870669

ABSTRACT:
A pair of variable-powered binoculars include a pair of objective lens systems; a pair of prism systems, each of the prism system inverting an image that advances through the corresponding objective lens systems, from an inverted image to an erecting image; a pair of concave adjusting lenses, each of the concave adjusting lenses placed between a focus formed by the corresponding objective lens system and the corresponding prism system, so that each of the concave adjusting lenses is movable along the optical axis formed by the corresponding objective lens system and the corresponding prism system; and a pair of ocular lens systems, each of the ocular lens systems placed on the optical axis, so that each ocular lens system is movable along the optical axis closer to or away from the corresponding concave adjusting lens, synchronizing with a movement of the corresponding concave adjusting lens.

REFERENCES:
patent: 4548481 (1985-10-01), Yamada
patent: 5576892 (1996-11-01), Hotta et al.
patent: 6059721 (2000-05-01), Rudischhauser et al.
patent: 6229653 (2001-05-01), Kanai
patent: 52-66446 (1977-06-01), None
patent: 2001-194593 (2001-07-01), None

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