US3909523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
CRT projection lens
Assignee: Lockheed Martin Tactical Systems Inc
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Filing: 1974-04-08
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Granted: 1975-09-30
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Expires: 1994-04-08
Abstract
Abstract An optical simulator is presented which is capable of compensating for the dispersions and aberations inherently present in an acrylic collimating lens so as to present to the eye of a viewer a virtual image of high quality color characteristics. A CRT projection system is combined with a unique lens arrangement to reflect the image off of a spherical screen and through a collimating lens to the eyes of the viewer. While the screen and collimating lens designs are somewhat standard, the projection lens is specifically designed to correct for the deficiencies of the two aforementioned elements.
Inventors
- 👤 John F Bartucci
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:29
CPC Classifications
G; G09; G09B; G09B9/00; G09B9/02; G09B9/08; G09B9/30; G09B9/32; G02; G02B; G02B13/00; G02B13/16
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
95 words
A simulator system for projecting a color image to the eye of a viewer which provides for an enlarged aperture at the eye of the viewer while maintaining color integrity of the image, comprising: image projecting means for projecting an optical image; a screen positioned opposite said projecting means for receiving said optical image; a collimating lens positioned between said screen and a trainee viewing station for presenting a collimated image thereto; and a lens system interposed between said projecting system and said screen and compensating for inherent light dispersion characteristics of tHe collimating lens.
Claim 2
Dependent Claim
95 words
A simulator system for projecting a color image to the eye of a viewer which provides for an enlarged aperture at the eye of the viewer while maintaining color integrity of the image, comprising: image projecting means for projecting an optical image; a screen positioned opposite said projecting means for receiving said optical image; a collimating lens positioned between said screen and a trainee viewing station for presenting a collimated image thereto; and a lens system interposed between said projecting system and said screen and compensating for inherent light dispersion characteristics of tHe collimating lens.
Claim 3
Dependent Claim
16 words
The simulator system as recited in claim 1 wherein said image projecting means comprises a CRT.
Claim 4
Dependent Claim
25 words
The simulator system as recited in claim 1 wherein said screen comprises a spherical section of a bonded sandwich of aluminized mylar and embossed vinyl.
Claim 5
Dependent Claim
13 words
The simulator system as recited in claim 3 wherein said screen is semi-specular.
Claim 6
Dependent Claim
32 words
The simulator system as recited in claim 1 wherein said collimating lens comprises a double convex element in spaced relationship with a plano convex element, said elements being of an acrylic material.
Claim 7
Dependent Claim
38 words
The simulator as recited in claim 1 wherein said image projecting means is a CRT and said lens system includes a field flattener lens mounted adjacent the CRT face for projecting the image onto a curved screen surface.
Claim 8
Dependent Claim
61 words
The simulator as recited in claim 1 wherein said lens system comprises a plurality of single lens elements and cemented achromats mounted within a threadably connected and adjustable housing, the lens elements and achromats compensating for the color dispersion of the collimating lens to fully correct the blue to yellow dispersion and reduce the blue to red dispersion by about 25%.
Claim 9
Dependent Claim
26 words
The simulator as recited in claim 7 wherein each of the lens elements and achromats are single coated with anti-reflection magnesium fluoride peaked at 5,500 ''A''.
Claim 10
Dependent Claim
95 words
An optical image simulator, comprising: an image projecting means; a semi-specular screen comprising a spherical section positioned opposite said projecting means to receive image projections therefrom; a collimating lens interposed between the screen and a viewer''s station for collimating the image viewed from the screen; and a lens system comprising a plurality of single lens elements and achromats contained within a threadably adjustable housing to compensate for the inherent light dispersion characteristics of the collimating lens and including a field flattener mounted adjacent said image projecting means for projecting an image onto the spherical screen.
Claim 11
Dependent Claim
95 words
An optical image simulator, comprising: an image projecting means; a semi-specular screen comprising a spherical section positioned opposite said projecting means to receive image projections therefrom; a collimating lens interposed between the screen and a viewer''s station for collimating the image viewed from the screen; and a lens system comprising a plurality of single lens elements and achromats contained within a threadably adjustable housing to compensate for the inherent light dispersion characteristics of the collimating lens and including a field flattener mounted adjacent said image projecting means for projecting an image onto the spherical screen.
References Cited (Backward Citations)
US3784742A
Cited
US3800085A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |