Optical: systems and elements – Lens – With variable magnification
Patent
1994-11-09
1996-03-19
Nguyen, Tan T.
Optical: systems and elements
Lens
With variable magnification
359375, 359380, 359407, 359422, 359432, 359792, G02B 1514
Patent
active
055007694
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 binocular' 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 and where R.sub.ex and the constants 1.5 and 13 are measured in millimeters. 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.
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BenOpcon, Inc.
Klee Maurice M.
Nguyen Tan T.
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