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 Title: |
US4991955:
Circular projection and display system using segmented trapezoidal screens
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Vetter, Richard; Pacific Palisades, CA
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| Assignee: |
Todd-AO Corporation, Los Angeles, CA
other patents from TODD-AO CORPORATION (577670) (approx. 2)
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| Published / Filed: |
1991-02-12
/ 1990-04-06
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| Application Number: |
US1990000506289
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| IPC Code: |
Advanced:
G03B 21/56;
G03B 37/04;
IPC-7:
G03B 37/00;
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| ECLA Code: |
G03B21/56; G03B37/04;
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| U.S. Class: |
Current:
352/069;
352/070;
353/048;
359/451;
Original:
352/069;
352/070;
350/125;
353/048;
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| Field of Search: |
352/069,70
353/048
350/125
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| Priority Number: |
| 1990-04-06 |
US1990000506289 |
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| Abstract: |
A circular projection system using segmented trapezoidal screens arranged in a continuous arcuate array about a central vertical axis. The top of each screen is tilted downward. Each screen is illuminated by a projector which is mounted above and behind the screen which opposes it. The image from each projector is also angled downward. For an eight-screen system, each screen is tilted by approximately 8 DEG . For a nine-screen system, each is tilted by approximately 7 DEG . For maximum linearity, the ratio of the distance between the projector lens and the top of the screen on which it projects to the width of the top of said screen is substantially equal to the ratio of the distance between the projector lens and the bottom of said screen to the width of the bottom of said screen.
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| Attorney, Agent or Firm: |
Poms, Smith, Lande & Rose ;
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| Primary / Asst. Examiners: |
Hayes, Monroe H.;
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| Maintenance Status: |
E3 Expired Check current status
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| INPADOC Legal Status: |
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| Family: |
None
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First Claim:
Show all 22 claims |
What is claimed is:
1. A multiple screen picture system comprising:
- a plurality of trapezoidal screens, each having a flat reflective surface of trapezoidal shape wherein the screen bottom width is greater than the screen top width;
- screen mounting means for mounting said plurality of screens in a continuous arcuate array positioned about a central vertical axis of such array and with each of said screens tilted to face in a downward inclined direction relative to said axis; and
- a plurality of motion picture projectors provided to project an image on each of said screens.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 12 U.S. patent(s) that reference this one
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