US5661608A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light box for optical valve
Assignee: Thales Avionics SAS
•
Filing: 1995-04-07
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Granted: 1997-08-26
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Expires: 2015-04-07
Abstract
Abstract A system of retro-illumination for optical valves integrated into a system of projection is constituted by a plane array of slotted fluorescent tubes, parallel to one another, associated with a plane array of longitudinal lenses parallel to the tubes and spaced out substantially by the same pitch. This system is a compact high-output system. It enables an easy gradation of the luminous level as well as the obtaining a trichromatic sequential retro-illumination without moving parts.
Inventors
- 👤 Bruno Barbier
- 👤 Patrick Lach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:00
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3102; H04N9/3105; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/1336; G02F1/133602; G02F1/133604; H04N9/3141; H04N9/315
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
189 words
A light box for an optical valve with a plane surface, the box comprising a light source emitting a light beam, constituted by at least one plane array of n fluorescent tubes having longitudinal slots, the slots having longitudinal planes of symmetry perpendicular to the plane of the valve and parallel to one another, each of said at least one plane array having a condenser orienting the light beam with respect to the surface of the valve, the condenser being constituted by a number n of longitudinal lenses equal to the number of slotted tubes, each lens having a plane of optical symmetry parallel to the planes of symmetry of the slots, each lens being located between a respective one of said slots and the surface of the valve, the distance between the plane of symmetry of a slot of a tube and the plane of symmetry of a lens closest to this plane of symmetry of the slot being non-decreasing with the distance from the plane of symmetry of the slot to a plane of reference parallel to the planes of symmetry of the lenses and the slots.
Claim 2
Dependent Claim
189 words
A light box for an optical valve with a plane surface, the box comprising a light source emitting a light beam, constituted by at least one plane array of n fluorescent tubes having longitudinal slots, the slots having longitudinal planes of symmetry perpendicular to the plane of the valve and parallel to one another, each of said at least one plane array having a condenser orienting the light beam with respect to the surface of the valve, the condenser being constituted by a number n of longitudinal lenses equal to the number of slotted tubes, each lens having a plane of optical symmetry parallel to the planes of symmetry of the slots, each lens being located between a respective one of said slots and the surface of the valve, the distance between the plane of symmetry of a slot of a tube and the plane of symmetry of a lens closest to this plane of symmetry of the slot being non-decreasing with the distance from the plane of symmetry of the slot to a plane of reference parallel to the planes of symmetry of the lenses and the slots.
Claim 3
Dependent Claim
47 words
A light box according to claim 1, wherein the lenses and the tubes of each array are positioned in such a way that a plane of optical symmetry of a lens containing the axial direction is also the plane of symmetry of a slot of a tube.
Claim 4
Dependent Claim
23 words
A use of three valves, each illuminated by a light box according to claim 2 for the obtaining of a three-valve spatial synthesis.
Claim 5
Dependent Claim
16 words
A use of a valve according to claim 2, for the making of an image projector.
Claim 6
Dependent Claim
16 words
A use of a valve according to claim 2, for the making of a head-up visor.
Claim 7
Dependent Claim
21 words
A use of a valve according to claim 2, for the making of a system of display in direct viewing mode.
Claim 8
Dependent Claim
19 words
A light box according to claim 1, comprising a scattering screen between the array of lenses and the valve.
Claim 9
Dependent Claim
23 words
A use of three valves, each illuminated by a light box according to claim 7 for the obtaining of a three-valve spatial synthesis.
Claim 10
Dependent Claim
16 words
A use of a valve according to claim 7, for the making of an image projector.
Claim 11
Dependent Claim
16 words
A use of a valve according to claim 7, for the making of a head-up visor.
Claim 12
Dependent Claim
21 words
A use of a valve according to claim 7, for the making of a system of display in direct viewing mode.
Claim 13
Dependent Claim
59 words
A light box according to claim 2, comprising three arrays of tubes associated with three arrays of lenses, each array of tubes comprising tubes of the same color, this color being different from that of the other two arrays, and means directing the light at output of each of the arrays of lenses towards one and the same valve.
Claim 14
Dependent Claim
23 words
A use of three valves, each illuminated by a light box according to claim 1 for the obtaining of a three-valve spatial synthesis.
Claim 15
Dependent Claim
16 words
A use of a valve according to claim 1, for the making of an image projector.
Claim 16
Dependent Claim
16 words
A use of a valve according to claim 1, for the making of a head-up visor.
Claim 17
Dependent Claim
21 words
A use of a valve according to claim 1, for the making of a system of display in direct viewing mode.
References Cited (Backward Citations)
EP0030875A1
Cited
US4810056A
Cited
US5057744A
Cited
US4807978A
Cited
US5053764A
Cited
US5239293A
Cited
EP0367332A2
Cited
EP0372525A2
Cited
US5027359A
Cited
WO1991018315A1
Cited
EP0492721A2
Cited
US5139609A
Cited
US5313054A
Cited
EP0540140A1
Cited
US5392140A
Cited
US5430816A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-08-25 | 2001-02-24 | 2001-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-08-25 | 2005-02-24 | 2005-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-08-25 | 2009-02-24 | 2009-08-26 | $7700.00 | Window Closed / Lapsed |