Wide angle binocular system with variable power capability
First Claim
1. An objective for use in a viewing system of the monocular or binocular type which forms an image of an object, said objective forming an intermediate image of the object and comprising in order from the object end of the viewing system:
- (a) a positive lens unit,(b) reverting and inverting means for causing the intermediate image when formed to be reverted and inverted, and(c) a fixed negative lens unit before the intermediate image.
1 Assignment
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Accused Products
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-1 [(Rex +1.5)/13], where Rex is the radius of the binoculars'"'"' exit pupil and where Rex 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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Citations
2 Claims
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1. An objective for use in a viewing system of the monocular or binocular type which forms an image of an object, said objective forming an intermediate image of the object and comprising in order from the object end of the viewing system:
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(a) a positive lens unit, (b) reverting and inverting means for causing the intermediate image when formed to be reverted and inverted, and (c) a fixed negative lens unit before the intermediate image. - View Dependent Claims (2)
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Specification