US3813140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotating prism scanning system having range compensation
Assignee: Bendix Corp
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Filing: 1971-12-13
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Granted: 1974-05-28
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Expires: 1991-12-13
Abstract
Abstract A scanning mechanism including a rotating prism and having a relatively flat response irrespective of range variations between the scanning system and the object scanned is described. The inventive system is also free of scanning radiation scatter problems and is easily aligned. These advantages are obtained by utilizing an interference filter in the detection path of the reflected energy and also by detecting reflected energy from a surface of the prism which is different from the transmitting surface.
Inventors
- 👤 R Knockeart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:33
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/48; G01S7/481; G01S7/4817; B; B61; B61L; B61L25/00; B61L25/02; B61L25/04; B61L25/041; G01S17/00; G01S17/88; G01S17/89; G01S7/4811; H; H04; H04N; H04N1/00; H04N1/024; H04N1/028; H04N1/029
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
207 words
A system for scanning an object with radiation and for detecting radiation reflected from said object comprising: a reflective element mounted for rotation in said system and having a plurality of surfaces for transmitting radiation to said object and receiving reflected radiation from said object, said surfaces sequentially passing a first and a second preselected spatial location within said system as said element rotates in said system, said locations lying in the rotational path of said reflective element and being spaced so that different surfaces of said element simultaneously coincide with said first and second locations whereby one of said surfaces transmits radiation to said object and another of surfaces simultaneously receives radiation reflected from said object and all of said plurality of surfaces alternately serves as a receiving surface and a transmitting surface; means for directing said radiation to said first spatial location so that said object is scanned with said radiation as said surfaces sequentially pass said first location and thereby transmit said radiation to said object; means for detecting reflected radiation in the proximity of said second location so that radiation reflected from said object to said second location is received by said means for detecting as said surfaces sequentially pass said second location.
Claim 2
Independent Claim
207 words
A system for scanning an object with radiation and for detecting radiation reflected from said object comprising: a reflective element mounted for rotation in said system and having a plurality of surfaces for transmitting radiation to said object and receiving reflected radiation from said object, said surfaces sequentially passing a first and a second preselected spatial location within said system as said element rotates in said system, said locations lying in the rotational path of said reflective element and being spaced so that different surfaces of said element simultaneously coincide with said first and second locations whereby one of said surfaces transmits radiation to said object and another of surfaces simultaneously receives radiation reflected from said object and all of said plurality of surfaces alternately serves as a receiving surface and a transmitting surface; means for directing said radiation to said first spatial location so that said object is scanned with said radiation as said surfaces sequentially pass said first location and thereby transmit said radiation to said object; means for detecting reflected radiation in the proximity of said second location so that radiation reflected from said object to said second location is received by said means for detecting as said surfaces sequentially pass said second location.
Claim 3
Dependent Claim
27 words
The system of claim 1 wherein said means for detecting includes an interference filter for passing only radiation received within a selected range of angles of incidence.
Claim 4
Dependent Claim
26 words
The system of claim 2 wherein said means for directing radiation includes a laser; and further including mirror means interposed said filter and said reflective element.
Claim 5
Dependent Claim
67 words
The system of claim 1 further including an opaque member interposed said reflective element and said object, said opaque member including an aperture configured to minimize transmission of reflected radiation along the normal between said object and said reflective member and increase transmission of reflected radiation proportionately with the angle of reflection between said object and said reflective element and the angular rotation orientation of said prism.
Claim 6
Dependent Claim
27 words
The system of claim 4 wherein said means for detecting includes an interference filter for passing only radiation received within a selected range of angles of incidence.
Claim 7
Dependent Claim
42 words
The system of claim 4 wherein said aperture is configured with a narrow section and two wider sections which converge away from said narrow section, said converging sections being dimensioned to maximize transmission of reflected radiation at the extremeties of said aperture.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |