Optical: systems and elements – Lens – With variable magnification
Patent
1995-12-01
1996-11-19
Nguyen, Tan T.
Optical: systems and elements
Lens
With variable magnification
359375, 359407, 359432, 359774, G02B 1514
Patent
active
055768881
ABSTRACT:
Binoculars designed to provide a large aided static field of view are provided. The binoculars are characterized by S/D ratios of above 2.8, where S is the binoculars' aided static field of view calculated by multiplying the binoculars' magnifying power by the binoculars' semi field of view in object space and D is given by tan.sup.-1 [(R.sub.ex +1.5)/13], where R.sub.ex is the radius of the binoculars exit pupil the following expression in which R.sub.ex and the constants 1.5 and 13 are in milliliters. As a result of the increased S/D ratio, the binoculars of the invention minimize the sensation of tunnel vision which normally occurs when binoculars are used and reduce the user's apprehension of missing activities in his or her peripheral vision. In certain embodiments, a movable field lens unit is employed to provide variable power and a negative corrector lens unit is employed for aberration correction and to minimize the size of the binoculars. The binoculars are suitable for mass production and general consumer use.
REFERENCES:
patent: 2620706 (1952-12-01), Levin
patent: 3088368 (1963-05-01), Tripp et al.
patent: 3312518 (1967-04-01), Bushnell
patent: 3418032 (1968-12-01), Kajiro
patent: 3468596 (1969-09-01), Alvarez
patent: 4249793 (1981-02-01), Uehara
patent: 4417788 (1983-11-01), Alvarez et al.
patent: 4484802 (1984-11-01), Kiruchi
patent: 4488790 (1984-12-01), Beecher
patent: 4571038 (1986-02-01), Jako
patent: 4650297 (1987-03-01), Ishibai
patent: 4842395 (1989-06-01), Sato et al.
patent: 4848883 (1989-07-01), Maruyama
patent: 4877318 (1989-10-01), Miles et al.
patent: 4995707 (1991-02-01), Hashimoto
patent: 5028125 (1991-07-01), Kikuchi
patent: 5157553 (1992-10-01), Phillips et al.
patent: 5191470 (1993-03-01), Wickholm et al.
patent: 5193030 (1993-03-01), Nozaki et al.
patent: 5231540 (1993-07-01), Shibata
patent: 5311355 (1994-05-01), Kato
Dunn, J., "Improved binocular design gives users a wider view", The Engineer, May 21, 1992, 36.
Williamson, D., "The eye in optical systems", SPIE Geometrical Optics, vol. 531, 1985, 136-147.
Product brochure for Minolta binoculars, Minolta Camera Co., Ltd., Osaka, Japan, 1992.
BenOpcon, Inc.
Klee Maurice M.
Nguyen Tan T.
LandOfFree
Wide angle binocular system with variable power capability does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Wide angle binocular system with variable power capability, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Wide angle binocular system with variable power capability will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-545140