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Title: US4991955: Circular projection and display system using segmented trapezoidal screens
[ Derwent Title ]

Country: US United States of America

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8 pages

Inventor: Vetter, Richard; Pacific Palisades, CA

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

Application Number: US1990000506289

IPC Code: Advanced: G03B 21/56; G03B 37/04;
IPC-7: G03B 37/00;

ECLA Code: G03B21/56; G03B37/04;

U.S. Class: Current: 352/069; 352/070; 353/048; 359/451;
Original: 352/069; 352/070; 350/125; 353/048;

Field of Search: 352/069,70 353/048 350/125

Priority Number:
1990-04-06  US1990000506289

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.

Attorney, Agent or Firm: Poms, Smith, Lande & Rose ;

Primary / Asst. Examiners: Hayes, Monroe H.;

Maintenance Status: E3 Expired  Check current status

INPADOC Legal Status: Show legal status actions

Family: None

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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Description: Show description

Forward References: Show 13 U.S. patent(s) that reference this one

U.S. References: Go to Result Set: All U.S. references   |  Forward references (13)   |   Backward references (10)   |   Citation Link

Patent  Pub.Date  Inventor Assignee   Title
Get PDF - 4pp US1199460  1916-09 Featherstone   OPTICAL PROJECTOR.
Get PDF - 4pp US2795996* 1957-06 Sauer    
Get PDF - 5pp US2942516  1960-06 Disney et al.   Panoramic motion picture presentation arrangement
Get PDF - 9pp US3107577  1963-10 Adams   Panoramic motion picture projection apparatus
Get PDF - 5pp US3118340* 1964-01 Iwerks    
Get PDF - 9pp US3313068* 1967-04 Pinto    
Get PDF - 5pp US3785715  1974-01 Mecklenborg  The Singer Company PANORAMIC INFINITY IMAGE DISPLAY
Get PDF - 8pp US4473355  1984-09 Pongratz  Messerschmitt-Boelkow-Blohm Gesellschaft mit beschraenkter Haftung Visual simulator and display screen for said simulator
Get PDF - 17pp US4641918  1987-02 Moffatt et al.  EML Environmental Simulations Inc. Portable panoramic theatre
  * some details unavailable
Foreign References:
Publication Date IPC Code Assignee   Title
  DE0506234 1930-09       

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