Variable power optical system

Details Variable power optical system Variable power optical system

1994-12-27

1996-11-19

Nguyen, Thong

Optical: systems and elements

Lens

With variable magnification

359422, 359676, G02B 1514, G02B 2300

Patent

active

055768920

ABSTRACT:
A zooming monocular or zooming binoculars having an objective optical system and an eyepiece optical system, which includes at least one variable power lens group driven in the optical axis in the eyepiece optical system, a movable field stop which is provided to define the field of view so as to move in the optical axis direction independently of the variable power lens group, and driving means for moving the movable field stop in association with the movement of the movable variable power lens group in the optical axis direction along a track different from a track of the movement of the movable power lens group. The power is varied by moving a part of the eyepiece or ocular optical system and a reference diopter is maintained constant upon variations of the power at -1.+-.0.5 diopter.

REFERENCES:
patent: 4217048 (1980-08-01), Egawa
patent: 4437750 (1984-03-01), Ikari
patent: 4487482 (1984-12-01), Itoh et al.
patent: 4548481 (1985-10-01), Yamada
patent: 4634236 (1987-01-01), Masuusko
patent: 4664485 (1987-05-01), Momiyana et al.
patent: 4786150 (1988-11-01), Tsuji
patent: 4842395 (1989-06-01), Sato et al.
patent: 5071242 (1991-12-01), Yanagisawa
patent: 5140467 (1992-08-01), Hatta et al.
patent: 5311355 (1994-05-01), Kato
English Language Abstract of Japanese Publication No. 64-57223.

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