Patent US3799674A successfully refreshed from Google Patents.
US3799674A
Expired / Lapsed
US
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System enabling the detecting of movements of a first element in relation to another
Assignee: Compagnie Industriel des Lasers CILAS SA
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Filing: 1972-04-07
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Granted: 1974-03-26
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Expires: 1992-04-07
Abstract
Abstract System enabling the detecting of movements of a first element in relation to another, comprising a laser generator emitting a light beam co-operating with a fixed reference on one of the two elements, the laser generator being fixed on the other element, its beam being pointed on a photo-sensitive element arranged on the same element as that on which the laser generator is fixed.
Inventors
- 👤 H Guillet
- 👤 J Cornillault
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:08
CPC Classifications
G; G01; G01B; G01B11/00; G01B11/16
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
171 words
In a system for detecting possible movements of a first element relative to a second element, said system including a laser generator emitting a light beam, said generator being fixed at a first point on said second element, first photosensitive means fixed relative to a reference mark on said first element for sensing relative movement between said reference mark and said light beam, the improvement for compensating for spurious movements of said laser generator relative to said first point comprising: a. second photosensitive means fixed to a second point on said second element for receiving said light beam and producing an electrical control signal indicative of deviations of said received light beam from said second point, said reference mark being located between said first and second points of said second element; b. controllable beam directing means responsive to said control signal for directing said light beam to keep it on said second point; and c. beam splitter means for directing a portion of said light beam onto said first photosensitive means.
Claim 2
Dependent Claim
171 words
In a system for detecting possible movements of a first element relative to a second element, said system including a laser generator emitting a light beam, said generator being fixed at a first point on said second element, first photosensitive means fixed relative to a reference mark on said first element for sensing relative movement between said reference mark and said light beam, the improvement for compensating for spurious movements of said laser generator relative to said first point comprising: a. second photosensitive means fixed to a second point on said second element for receiving said light beam and producing an electrical control signal indicative of deviations of said received light beam from said second point, said reference mark being located between said first and second points of said second element; b. controllable beam directing means responsive to said control signal for directing said light beam to keep it on said second point; and c. beam splitter means for directing a portion of said light beam onto said first photosensitive means.
Claim 3
Dependent Claim
43 words
The improvement defined in claim 1 wherEin said first photosensitive means comprises at least a first 4-photocell unit, and further comprising display means connected to the output of said unit for displaying the relative movement between said reference mark and said light beam.
Claim 4
Dependent Claim
29 words
The improvement defined in claim 2 wherein said second photosensitive means comprises a second 4-photocell unit, the center of which corresponds to said second point of said second element.
Claim 5
Dependent Claim
25 words
The improvement as defined in claim 3 wherein said reference mark is located substantially half-way between said first and second points of said second element.
Claim 6
Dependent Claim
65 words
The improvement defined in claim 3 wherein said controllable beam directing means comprises controllable beam deflector means in the path of said light beam for deflecting the beam in response to said control signal such that the beam is kept on said center of said second 4-photocell unit, said deflector means being located on said second element between said laser generator and said reference mark.
Claim 7
Dependent Claim
52 words
In a system according to claim 5, said deflector means comprising two prisms and means for driving said two prisms in a rotational movement each in relation to the other about an axis crossing the faces of said prisms and coinciding with the axis of the beam emerging from said laser generator.
Claim 8
Dependent Claim
55 words
In a system according to claim 1 wherein said first element is a dam and said second element comprises the walls of a valley which are continguous to opposite ends of said dam, and wherein said first point is on one of said walls and said second point is on the other of said walls.
References Cited (Backward Citations)
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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) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |