US4697089A
Expired / Lapsed
US
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Dual wavelength sensor which employs object as part of a corner reflector
Assignee: Motorola Solutions Inc
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Filing: 1986-06-18
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Granted: 1987-09-29
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Expires: 2006-06-18
Abstract
Abstract Two emitters, producing light at different wavelengths, and a single receiver provide an optical sensor useful for detecting the presence or position of objects having surfaces which do not totally reflect incident light.
Inventors
- 👤 David J. Drage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:10
CPC Classifications
G; G01; G01S; G01S17/00; G01S17/02; H; H10; H10P; H10P72/00; H10P72/50; H10P72/53
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
49 words
Optical detecting means comprising: a first means for emitting light at a first wavelength; a second means for emitting light at a second wavelength; detector means; and corner reflector means, including an article to be sensed, for re-directing light from said first and second emitters to said detector means.
Claim 2
Dependent Claim
49 words
Optical detecting means comprising: a first means for emitting light at a first wavelength; a second means for emitting light at a second wavelength; detector means; and corner reflector means, including an article to be sensed, for re-directing light from said first and second emitters to said detector means.
Claim 3
Dependent Claim
26 words
The apparatus as set forth in claim 1 wherein said detector means comprises: a single photosensitive device responsive to both said first and said second wavelength.
Claim 4
Dependent Claim
26 words
The apparatus as set forth in claim 1 wherein said detector means comprises: first and second photosensitive devices responsive to said first and second wavelengths, respectively.
Claim 5
Dependent Claim
22 words
The apparatus as set forth in claim 1 wherein said first and second emitting means are positioned adjacent to said detector means.
Claim 6
Dependent Claim
43 words
The apparatus as set forth in claim 4 wherein said corner reflector comprises: an article whose presence is being detected; and mirror means for re-directing a beam of light back along a path approximately parallel to a beam incident upon said corner reflector.
Claim 7
Dependent Claim
24 words
The apparatus as set forth in claim 5 wherein said mirror means comprises a member having a portion of the surface thereof smoothly polished.
Claim 8
Dependent Claim
35 words
The apparatus as set forth in claim 1 wherein said first and second emitter means are positioned so that light emitted therefrom is incident upon said article at an angle greater than about sixty degrees.
Claim 9
Dependent Claim
24 words
The apparatus as set forth in claim 1 wherein said first and second means for emitting light produce pulsed light for detecting said article.
Claim 10
Dependent Claim
24 words
The apparatus as set forth in claim 1 wherein said first and second means for emitting light produce continuous light for detecting said article.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-09-28 | 1991-03-30 | 1991-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-28 | 1995-03-30 | 1995-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-28 | 1999-03-30 | 1999-09-29 | $7700.00 | Window Closed / Lapsed |