US3738733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical display systems
Assignee: Qioptiq Ltd
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Filing: 1971-10-06
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Granted: 1973-06-12
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Expires: 1991-10-06
Abstract
Abstract A head-up display system having a first display apparatus including a cathode ray tube to give a main display and an optical system through which the image on the tube travels towards an observer, and a second display apparatus including a source of light and image means to provide an additional display, and light-directing means to direct light from the source into the optical system so as to travel toward the cathode ray tube so that an image of the additional display is formed on the tube, whereby a stand-by display is provided which can be switched on in the event of failure of the main display. The light-directing means is positionally adjustable, whereby the position of the image of the additional display formed on the cathode ray tube is also adjustable.
Inventors
- 👤 A Pettit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:49
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/01; G02B27/0101; G02B27/0149; G02B2027/0154
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
134 words
An optical display system comprising firstly main display means including a cathode ray tube with a phosphor surface to provide the main display and a collimating optical system including at least an exit lens component through which light from the cathode ray tube travels towards an observer and secondly additional display means including a source of light and image means to provide the additional display and light directing means including collimating projection means to direct light from the light source into the optical system so as to travel through said exit lens component towards the cathode ray tube to form an image of the additional display on the phosphor surface of the cathode ray tube, whereby light from the image reflected from the phosphor surface can travel through the optical system towards the observer.
Claim 2
Dependent Claim
134 words
An optical display system comprising firstly main display means including a cathode ray tube with a phosphor surface to provide the main display and a collimating optical system including at least an exit lens component through which light from the cathode ray tube travels towards an observer and secondly additional display means including a source of light and image means to provide the additional display and light directing means including collimating projection means to direct light from the light source into the optical system so as to travel through said exit lens component towards the cathode ray tube to form an image of the additional display on the phosphor surface of the cathode ray tube, whereby light from the image reflected from the phosphor surface can travel through the optical system towards the observer.
Claim 3
Dependent Claim
32 words
An optical display system according to claim 1 wherein the main display means is arranged as a head-up display system and the additional display means is arranged as a stand-by display system.
Claim 4
Dependent Claim
55 words
An optical display system according to claim 1 wherein light leaving the optical system travels to a partially reflecting combiner which reflects light towards the observer and through which the observer views a scene, so as to superimpose an image of the main display and/or tHe additional display on the observers view of the scene.
Claim 5
Dependent Claim
31 words
An optical display system according to claim 1 wherein the light directing means directs light from the additional display through an edge portion of the exit lens into the optical system.
Claim 6
Dependent Claim
31 words
An optical display system according to claim 4 wherein the light directing means comprises a mirror located adjacent to the edge portion of the outer face of the exit lens component.
Claim 7
Dependent Claim
42 words
An optical display system according to claim 5 wherein the light directing means is adjustable by mounting the mirror for angular adjustment so that the image of the additional display on the phosphor surface of the cathode ray tube can be adjusted.
Claim 8
Dependent Claim
27 words
An optical display system according to claim 1 wherein the additional display means comprises as the image means a graticule which is illuminated by the light source.
Claim 9
Dependent Claim
17 words
An optical display system according to claim 1 wherein the light source comprises an integral reflector lamp.
Claim 10
Dependent Claim
121 words
A head-up display system comprising a cathode ray tube with a phosphor surface and a collimating optical system including an exit component, to provide a main display characterized by the provision of additional display means including a source of light, image means, collimating projection means, and light directing means adapted to direct light from the said light source into an edge portion of the exit component of the optical system for travel towards the cathode ray tube to form an image on the phosphor surface of the cathode ray tube of a display provided by the said additional display means in such a way that only a very small part of the main display is obscured by the additional display means.
Claim 11
Dependent Claim
121 words
A head-up display system comprising a cathode ray tube with a phosphor surface and a collimating optical system including an exit component, to provide a main display characterized by the provision of additional display means including a source of light, image means, collimating projection means, and light directing means adapted to direct light from the said light source into an edge portion of the exit component of the optical system for travel towards the cathode ray tube to form an image on the phosphor surface of the cathode ray tube of a display provided by the said additional display means in such a way that only a very small part of the main display is obscured by the additional display means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |