US4235503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film projection lens system for 3-D movies
Assignee: Individual
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Filing: 1978-05-08
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Granted: 1980-11-25
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Expires: 1998-05-08
Abstract
Abstract Dual projection lens systems are housed together to project adjacent stereo images onto a screen in stereoscopic position relationship. An ultra-violet filter is positioned on the optical axis of each lens system, and toward the screen a separate polarizer is positioned on each axis to provide polarized images to be seen by the viewer through binocular-polarized eyepieces. Heat sinks are attached to the filters for removing heat.
Inventors
- 👤 Chris J. Condon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:18
CPC Classifications
G; G03; G03B; G03B35/00; G03B35/18; G03B35/26; G02; G02B; G02B30/00; G02B30/20; G02B30/22; G02B30/25
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
111 words
A film projection lens system comprising: lens elements defining first and second adjacent image projection paths to provide image paths from an illuminated image to a screen; first and second polarizing filters respectively positioned along said first and second image paths, said polarizing filters being positioned to differently polarize images on said first and second paths; ultra-violet filter means positioned on both of said paths and positioned between said polarizing filters and the illuminated image for reducing the ultra-violet rays along the image paths impinging on the polarizing filters to reduce ultra-violet degradation of the polarizing filters; and a heat sink attached to said ultra-violet filter means to remove heat therefrom.
Claim 2
Dependent Claim
111 words
A film projection lens system comprising: lens elements defining first and second adjacent image projection paths to provide image paths from an illuminated image to a screen; first and second polarizing filters respectively positioned along said first and second image paths, said polarizing filters being positioned to differently polarize images on said first and second paths; ultra-violet filter means positioned on both of said paths and positioned between said polarizing filters and the illuminated image for reducing the ultra-violet rays along the image paths impinging on the polarizing filters to reduce ultra-violet degradation of the polarizing filters; and a heat sink attached to said ultra-violet filter means to remove heat therefrom.
Claim 3
Dependent Claim
113 words
A film projection lens system comprising: lens elements defining first and second adjacent image projection paths to provide image paths from an illuminated image to a screen; first and second polarizing filters respectively positioned along said first and second image paths, said polarizing filters being positioned to differently polarize images on said first and second paths; ultra-violet filter means positioned on both of said paths and positioned between said polarizing filters and the illuminated image for reducing the ultra-violet rays along the image paths impinging on the polarizing filters to reduce ultra-violet degradation of the polarizing filters; and a heat sink secured to said polarizing filters for removing heat from said polarizing filters.
Claim 4
Dependent Claim
113 words
A film projection lens system comprising: lens elements defining first and second adjacent image projection paths to provide image paths from an illuminated image to a screen; first and second polarizing filters respectively positioned along said first and second image paths, said polarizing filters being positioned to differently polarize images on said first and second paths; ultra-violet filter means positioned on both of said paths and positioned between said polarizing filters and the illuminated image for reducing the ultra-violet rays along the image paths impinging on the polarizing filters to reduce ultra-violet degradation of the polarizing filters; and a heat sink secured to said polarizing filters for removing heat from said polarizing filters.
Claim 5
Dependent Claim
24 words
The film projection lens system of claim 2 wherein a heat sink is also attached to said ultra-violet filter means to remove heat therefrom.
Claim 6
Dependent Claim
26 words
The film projection lens system of claim 3 wherein said heat sinks are metal bars, and said metal bars are attached by adhesive to receive heat.
Claim 7
Dependent Claim
32 words
The film projection lens system of claim 4 wherein said lens elements are positioned in a lens tube, and said polarizing filters and said ultra-violet filter are positioned in a lens tube.
References Cited (Backward Citations)
US2845843A
Cited
US3893750A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-25 | 1984-05-26 | 1984-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-25 | 1988-05-26 | 1988-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-25 | 1992-05-26 | 1992-11-25 | $7700.00 | Window Closed / Lapsed |