Three-dimensional display

• US 4,130,832 A
• Filed: 07/11/1977
• Issued: 12/19/1978
• Est. Priority Date: 07/11/1977
• Status: Expired due to Term

• Current Assignee: Bolt Beranek and Newman, Inc.
• Original Assignee: Bolt Beranek & Newman, Inc. (Verizon Communications Inc.)
• Inventors: Sher, Lawrence D.
• Primary Examiner(s): Evans, F. L.
• Application Number:
  US05/814,711
• Time in Patent Office: 526 Days
• Field of Search: 350/295, 358/88, 358/89
• US Class Current: 348/44
• CPC Class Codes: G02B 30/54 the 3D volume being generated by moving a 2D surface, e.g. by vibrating or rotating the 2D surface
• CPC Class Codes: G09G 1/06 using single beam tubes G09G1/26, G09G1/28 take precedence, e.g. three-dimensional or perspective representation, rotation or translation of display pattern, hidden lines, shadows G09G1/28 takes precedence; stereoscopic TV-systems, details thereof H04N13/00; oscilloscopes for three-dimensional representation G01R13/206; vectorscopes G01R13/208
• CPC Class Codes: G09G 3/003 to produce spatial visual effects

Abstract

The three-dimensional display system disclosed herein employs the varying focal properties of a vibrating mirror to cause sequentially generated image components to appear juxtaposed in space. The mirror is constructed as a circular reflective plate having substantial stiffness and resilience. The plate is weighted about its rim and is supported by a flexible support ring engaging the plate along a concentric circular locus spaced inside of the rim so as to provide a useful curvature over substantially the entire surface of the plate.

Claims

1. A three-dimensional display system comprising:

a circular reflective plate having substantial stiffness and resilience;

weighting means attached to and distributed around the rim of said plate, the mass of said weighting means being greater than that of the plate itself;

means for compliantly supporting said plate along a concentric circular locus which is substantially inside of the rim of said plate;

means for applying an oscillatory force to said plate to drive the plate into oscillation with the motion of the rim being out-of-phase with the motion of said central portion; and

means for generating, in a plane, successive image components which are produced in synchronization with the oscillation of said plate at different phases thereof, the image-generating means being positioned so as to be viewable by way of said reflective plate, whereby the image components so viewed appear juxtaposed in space in accordance with the variation in effective focal length of said mirror.

2. A display system as set forth in claim 1 wherein said weighting means comprises a series of weight segments rigidly attached to the rim of said plate.

3. A display system as set forth in claim 1 wherein said weighting means comprises a rigid ring compliantly connected to the rim of said plate.

4. A display system as set forth in claim 1 wherein said image-generating means includes a cathode ray tube.

5. A display system as set forth in claim 1 wherein said force-applying means comprises a loudspeaker acoustically coupled to the central portion of said plate.

6. A three-dimensional display system comprising:

a circular reflective plate having substantial stiffness and resilience;

weighting means attached to and distributed around the rim of said plate, the mass of said weighting means being greater than that of the plate itself;

a flexible, annular support ring for supporting said plate along a concentric circular locus which is substantially inside of the rim of said plate;

means for applying an oscillatory force to the central portion of said plate to drive the plate into essentially resonant oscillation with the motion of the rim being out-of-phase with the motion of said central portion; and

means for generating, in a plane, successive image components which are produced in synchronization with the oscillation of said plate at different phases thereof, the image-generating means being positioned so as to be viewable by way of said reflective plate, whereby the image components so viewed appear juxtaposed in space in accordance with the variation in effective focal length of said mirror.

7. A display system as set forth in claim 6 wherein said weighting means comprise a series of weight segments rigidly attached to the rim of said plate.

8. A display system as set forth in claim 6 wherein the diameter of said locus is about 80% of the diameter of said plate.

9. A display system as set forth in claim 6 wherein said support ring has a hourglass-shape cross-section.

10. A display system as set forth in claim 6 wherein said plate is acrylic plastic.

11. A three-dimensional display system comprising:

a circular plate having substantial stiffness and resilience, said plate being reflective to one side;

a series of weight segments attached to and distributed around the rim of said plate, the mass of said weight segments being greater than that of the plate itself;

a flexible, annular support ring attached to and supporting said plate along a concentric circular locus on the opposite side of said plate, the diameter of the locus being about 80% of the diameter of said plate;

means including a loudspeaker for applying an oscillatory force to the central portion of said plate to drive the plate into essentially resonant oscillation with the motion of the rim being out-of-phase with the motion of said central portion; and

means including a cathode ray for generating, in a plane, successive image components which are produced in synchronization with the oscillation of said plate at different phases thereof, the image-generating means being positioned so as to be viewable by way of said reflective plate, whereby the image components so viewed appear juxtaposed in space in accordance with the variation in effective focal length of said mirror.