Two-stage variable power binoculars

Details Two-stage variable power binoculars Two-stage variable power binoculars

2006-10-24

2006-10-24

Nguyen, Thong Q (Department: 2872)

Optical: systems and elements

Compound lens system

Telescope

C359S407000, C359S432000

Reexamination Certificate

active

07126753

ABSTRACT:
The two-stage variable power binoculars are configured so that, in right and left body tubes focus lenses are movably provided in the direction of optical axis, movable frames are movably provided in a direction so as to intersect with the optical axis, magnification switch lenses are respectively provided in the movable frames a magnification switch knob for moving the focus lenses and movable frames is provided in a center portion connecting the body tubes and the magnification switch knob is operated to move the movable frames so that the magnification switch lenses are disposed at either the high-magnification position on the optical axis or at the low-magnification position set back from the optical axis, and simultaneously, to move the focus lenses so that focus is adjusted.

REFERENCES:
patent: 4030808 (1977-06-01), Hornschu et al.
patent: 4436387 (1984-03-01), Shimizu
patent: 5064279 (1991-11-01), Riedl
patent: 5971540 (1999-10-01), Ofner
patent: 6412958 (2002-07-01), Aikawa
patent: 63-65013 (1988-04-01), None

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