IR optical position sensor system
First Claim
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1. An infrared optical position detection system, comprising:
- (a) an infrared emitter to emit infrared radiation toward an object;
(b) a receiver to receive said infrared radiation scattered by said object and to determine position of said object;
(c) said receiver including a detector;
(d) said receiver including an optical system comprising two and no more than two lenses; and
wherein;
(e) said two and no more than two lenses comprise an aspheric lens having its convex aspheric surface directed toward said object and its spherical surface adjacent a symmetric-convex lens.
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Abstract
In a preferred embodiment, an infrared optical position detection system, including: an infrared emitter to emit infrared radiation toward an object; a receiver to receive the infrared radiation scattered by the object and to determine position of the object; the receiver including a detector; and the receiver including an optical system having two and no more than two lenses.
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Citations
6 Claims
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1. An infrared optical position detection system, comprising:
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(a) an infrared emitter to emit infrared radiation toward an object;
(b) a receiver to receive said infrared radiation scattered by said object and to determine position of said object;
(c) said receiver including a detector;
(d) said receiver including an optical system comprising two and no more than two lenses; and
wherein; (e) said two and no more than two lenses comprise an aspheric lens having its convex aspheric surface directed toward said object and its spherical surface adjacent a symmetric-convex lens. - View Dependent Claims (2, 3)
said aspheric lens has a focal length of 12 mm, a lens diameter of 18 mm, and a back focal length of 6.9 mm;
said symmetric-convex spherical lens has focal length of 12 mm, a lens diameter of 15 mm, and a back focal length of 18.3 mm; and
said optical system has an effective focal length of 8.7 mm, a system aperture diameter of 15.7 mm, and a back focal length of 3.77 mm.
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3. An infrared optical position detection system, as defined in claim 2, wherein:
said optical system has a field of view of 50 degrees.
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4. An infrared optical position detection and classification system in combination with a vehicle air bag deployment system, comprising:
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(a) an infrared emitter to emit infrared radiation toward a passenger;
(b) a receiver to receive said infrared radiation scattered by said passenger and to determine position and classification of said passenger, (c) said receiver including a detector including an optical system comprising two and no more than two lenses;
(d) control means connected to said receiver to suppress enablement of a vehicle air bag if it is determined that an occupant is in an at-risk zone or is seated in a rear facing infant seat and to enable deployment of said vehicle air bag if it is determined that said occupant is not in said at-risk zone or is not seated in said rear facing infant seat and wherein; (e) said two and no more than two lenses comprise an aspheric lens having its convex surface directed toward said object and its spherical surface adjacent a symmetric-convex lens. - View Dependent Claims (5, 6)
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Specification