US4812000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for generating frame sweeping with laser beam, in particular for projecting images
Assignee: Thales SA
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Filing: 1987-03-30
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Granted: 1989-03-14
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Expires: 2007-03-30
Abstract
Abstract The system for generating and projecting laser images comprises essentially a deflector with two pencil galvanometers and a rotator with prisms, the laser beam being modulated by a modulator with two tracks, and a sweeping generator producing line and frame signals in the form of saw teeth without synchronization dots, and it is applied to a training simulation for aerial combat.
Inventors
- 👤 Philippe Rouille
- 👤 Roland Jezequel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:03
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/02; H04N3/08; G; G02; G02B; G02B26/00; G02B26/08; G02B26/10; G02B26/105
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
53 words
System for generating framed sweeping with a laser beam, in particular for the projection of images, wherein it comprises a deflector system with two pencil galvanometers each having a mirror, and a prism rotator between said galvanometers for deflecting a light beam from one of the galvanometers through 90° to the other galvanometer.
Claim 2
Dependent Claim
53 words
System for generating framed sweeping with a laser beam, in particular for the projection of images, wherein it comprises a deflector system with two pencil galvanometers each having a mirror, and a prism rotator between said galvanometers for deflecting a light beam from one of the galvanometers through 90° to the other galvanometer.
Claim 3
Dependent Claim
39 words
System according to claim 1, wherein the rotator comprises two total reflection prisms of similar size, assembled by one of their bases, so that the base of the one is orientated at 90° from that of the other prism.
Claim 4
Dependent Claim
39 words
System according to claim 2, of which the galvanometers have parallel longitudinal axes, wherein these galvanometers are axially shifted with respect to each other along said longitudinal axes by a distance equal to the side of a prism base.
Claim 5
Dependent Claim
50 words
System according to claim 1, wherein the rotator comprises three total reflection prisms, a rotator obtained by gluing respectively to the two bases of a first prism, one of the two bases of the other prisms in such a manner that they have their other base in a common plane.
Claim 6
Dependent Claim
33 words
System according to claim 1, wherein the deflector system cooperates with a device producing at least one modulated laser and, with a device for generating sweeping signals producting line and frame sweeping signals.
Claim 7
Dependent Claim
38 words
System according to claim 5, wherein said system further comprises a digital image memory connected to an image source receiving from the sweeping signal generating device clock signals and frame starting signals and controlling a laser beam modulator.
Claim 8
Dependent Claim
29 words
System according to claim 6, wherein the image of the neck of the laser source is conjugated by a lens on the mirror of said one of the galvanometers.
Claim 9
Dependent Claim
18 words
Systems according to claim 7, wherein the beam issuing from the laser source crosses through a multibeam modulator.
Claim 10
Dependent Claim
30 words
System according to claim 8, wherein a diaphragm is placed at the exit of the laser beam modulator, so as to allow to pass only those beams of order 1.
Claim 11
Dependent Claim
51 words
System according to claim 9, wherein a return mirror is disposed upstream from the deflector system, the focal distance of the said lens being such that the conjugated optics of the neck of the laser source is situated on the mirror of said one of the galvanometers of the deflector system.
References Cited (Backward Citations)
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US4386851A
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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) | 1992-03-13 | 1992-09-12 | 1993-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-13 | 1996-09-12 | 1997-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-13 | 2000-09-12 | 2001-03-14 | $7700.00 | Window Closed / Lapsed |