EP0210088B1
Expired / Lapsed
EP
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Wide-field plural-source display apparatus
Assignee: Thales Avionics SAS
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Filing: 1986-06-17
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Granted: 1990-09-26
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Expires: 2006-06-17
Abstract
No abstract record available.
Inventors
- 👤 Didier Loiseaux
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 21:11
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/01; G02B27/0101; G03; G03B; G03B21/00; G03B21/005; G02B2027/0138; G02B2027/014; G02B27/0149; G02B2027/0154
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
192 words
Extended field display apparatus in which the image is formed by the juxtapositioning of at least two partial images obtained by means of two respective projection devices, said apparatus comprising: -at least two opto-electronic assemblies (12, 13, 7, 8) controlled by at least one electronic symbol generator (14, 15), so as to generate two respective substantially complementary partial' images of the image it is desired to obtain, and -at least two projection devices (5, 6, 9, 10) associated respectively with said assemblies, these two devices being adapted so as to jointingly project on to at least one screen (1, 2) the two partial images for recreating on this screen (1, 2) the complete image it is desired to obtain, said apparatus being characterized in that it further comprises: at least two detection devices (17 to 23) for detecting the relative position and/or the orientation of the two projection devices (5, 6, 9, 10) with respect to the screen (1, 2); and a processor (16) acting on the symbol generator (14, 15) for correcting the partial images in real time as a function of the information'delivered by said detection devices (17 to 23).
Claim 2
Dependent Claim
192 words
Extended field display apparatus in which the image is formed by the juxtapositioning of at least two partial images obtained by means of two respective projection devices, said apparatus comprising: -at least two opto-electronic assemblies (12, 13, 7, 8) controlled by at least one electronic symbol generator (14, 15), so as to generate two respective substantially complementary partial' images of the image it is desired to obtain, and -at least two projection devices (5, 6, 9, 10) associated respectively with said assemblies, these two devices being adapted so as to jointingly project on to at least one screen (1, 2) the two partial images for recreating on this screen (1, 2) the complete image it is desired to obtain, said apparatus being characterized in that it further comprises: at least two detection devices (17 to 23) for detecting the relative position and/or the orientation of the two projection devices (5, 6, 9, 10) with respect to the screen (1, 2); and a processor (16) acting on the symbol generator (14, 15) for correcting the partial images in real time as a function of the information'delivered by said detection devices (17 to 23).
Claim 3
Dependent Claim
45 words
Apparatus according to Claim 1, characterized in that it comprises a screen (1, 2) associated with each of the projection devices (5, 6, 9, 10), the screens (1, 2) being adapted so that the partial images appear jointingly in the visual field of an observer.
Claim 4
Dependent Claim
91 words
Apparatus according to one of Claims 1 or 2, characterized in that said detection devices each comprise a radiating source (17, 18) fixed to the structure of the projection device (3, 4) and adapted for emitting a rectilinear beam on to the screen (1, 2) and a reflector (19, 20), fixed to the screen (1, 2) and adapted so as to reflect the beam on to the sensitive area of a receiver (22, 23) designed so as to deliver information relative to the position of said beam on said sensitive area.
Claim 5
Dependent Claim
80 words
Apparatus according to one of the preceding claims, characterized in that said opto-electronic assemblies each comprise, for the formation of the partial images, a laser radiating source (30) which emits on to a diffusing element (35) via an opto-electronic system comprising a modulator (34) and two electrically controllable crossed optical deflectors (Dx, Dy) driven by the symbol generator (30), and in that the scren or the screens (38) on which the partial images are projected consists of a holographic mixer.
Claim 6
Dependent Claim
26 words
Apparatus according to Claim 4, characterized in that the reflectors associated with said detectors (22, 23) consist of holographic reflectors (40) formed on said mixers (38).
Claim 7
Dependent Claim
91 words
Apparatus according to Claim 5, characterized in that the holographic reflector (40) is formed at the time of recording the hologram of the mixer (38), by disposing a mirror (41) during an additional step, before development and without dismantling the mixer (38), and in that this mirror (41) and the source point (R) are situated on each side of the plate carrying the emulsion (monobeam recording of a local flat mirror), so that the mixer has locally two functions: image formation and reflection of the test ray in the appropriate direction.
Claim 8
Dependent Claim
37 words
Apparatus according to one of Claims 5 and 6, characterized in that said symbol generator (30) is designed so that said opto-electronic assemblies (34, Dx, Dy, 35) emit laser radiation periodically on to said holographic reflectors (40).
Claim 9
Dependent Claim
150 words
Apparatus according to one of the preceding claims, more particularly intended for forming an image by juxtapositioning three partial images formed on three respective holographic mixers, namely; a central mixer (46) and two lateral mixers (47, 48), by means of three optical assemblies each comprising a laser radiating source (30), a modulator (34), two crossed optical deflectors (Dx, Dy) and a diffusing element (35), characterized in that the projection devices (36, 37) associated with the two lateral mixers (47, 48) are set so that their optical axes pass respectively through both eyes (O d , Og) of the observer, whereas the projection device assigned to the central mixer (46) is adjusted so that its optical axis passes substantially through the median point (M) of the segment connecting together the two eyes, the three systems operating with pupil conjugation (biocular for the central system and monocular for the two lateral systems).
Claim 10
Dependent Claim
27 words
Apparatus according to Claim 8, characterized in that the two lateral mixers (47, 48) are offset downstream of the central mixer (46) with respect to the observer.
Claim 11
Dependent Claim
113 words
Apparatus according to one of Claims 7 and 8, wherein the central mixer (46) is carried by a frame comprising two lateral uprights (49, 50), characterized in that, on the same side of the visual axis of the observer (X'X) the inner lateral edge (51, 52) of the lateral mixer (47, 48) bears on the surface generated by the straight lines passing through the median point (M) and the lateral edge of the central mixer (46), and in that said lateral upright (49, 50) extends in the space between said surface and a surface generated by the straight lines passing through the eye <0 d , Og) and said inner edge (51, 52).
References Cited (Backward Citations)
No citation records indexed.
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