Zoom finder

Details Zoom finder Zoom finder

1992-10-20

1994-05-03

Dzierzynski, Paul M.

Optical: systems and elements

Lens

With variable magnification

35419512, G02B 1302

Patent

active

053092864

ABSTRACT:
A zoom finder is provided and includes a lens group for producing a field flattening effect for correcting a curvature of field. The zoom finder includes an objective optical system of a positive power having a first lens group of negative power, a second lens group of positive power, a third lens group of positive power, and an eyepiece optical system of positive power through which an image formed by the objective optical system is observed. The first lens group, the second lens group, the third lens group and the eyepiece optical systems are arranged in this order from an object side. The second lens group of the objective optical system is movable in an optical axis direction to vary the power, and the first and second lens groups are movable in association with each other in order to keep a constant diopter.

REFERENCES:
patent: 3821768 (1974-06-01), Urano et al.
patent: 4198129 (1980-04-01), Vockenhuber
patent: 4299453 (1981-11-01), Momiyama et al.
patent: 4636040 (1987-01-01), Tokumaru
patent: 4653887 (1987-03-01), Wakamiya
patent: 4725130 (1988-02-01), Ozawa
patent: 4757336 (1988-07-01), Nakayama et al.
patent: 4806001 (1989-02-01), Okabe et al.
patent: 4812023 (1989-03-01), Kikuchi
patent: 4828372 (1989-05-01), Betensky et al.
patent: 4838668 (1989-06-01), Betensky et al.
patent: 4842395 (1989-06-01), Sato et al.
patent: 4854680 (1989-08-01), Kikuchi
patent: 4906078 (1990-03-01), Inabata et al.
patent: 4909614 (1990-03-01), Itoh et al.
patent: 4936661 (1990-06-01), Betensky et al.
patent: 4941012 (1990-07-01), Inabata
patent: 4995707 (1991-02-01), Hashimoto
patent: 5054897 (1991-10-01), Ozawa
patent: 5071235 (1991-12-01), Mori et al.
patent: 5086353 (1992-02-01), Mukai et al.
patent: 5160954 (1992-11-01), Suzuki et al.
patent: 5173806 (1992-12-01), Ogata
patent: 5191477 (1993-03-01), Abe et al.
patent: 5221995 (1993-06-01), Yaneyama
patent: 5225927 (1993-07-01), Nozaki et al.
patent: 5225937 (1993-07-01), Horiuchi
patent: 5231540 (1993-07-01), Shibata

Affiliated with

Also associated with

Rating

Zoom finder does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Zoom finder, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Zoom finder will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2119436