Light display projector with wide angle capability and associated method

• US 6,392,821 B1
• Filed: 09/28/2000
• Issued: 05/21/2002
• Est. Priority Date: 09/28/2000
• Status: Expired due to Fees

• Current Assignee: William R. Benner Jr
• Original Assignee: William R. Benner Jr
• Inventors: Benner, Jr., William R.
• Primary Examiner(s): Ben, Loha
• Assistant Examiner(s): Spector, David N.
• Application Number:
  US09/672,286
• Time in Patent Office: 600 Days
• Field of Search: 348/36, 348/37, 348/38, 348/39, 359/726, 359/727, 359/728, 359/725, 359/286, 359/287, 359/578, 382/154, 353/34, 353/30, 353/35, 353/36, 353/37
• US Class Current: 359/727
• CPC Class Codes: G02B 26/10 Scanning systems
• CPC Class Codes: H04N 5/7416 involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal
• CPC Class Codes: H04N 9/3129 scanning a light beam on the display screen scanning a light beam on a screen in displays other than projection devices G09G3/02; scanning systems in general G02B26/10; projectors using laser light sources in general H04N9/3161

Abstract

A projector for producing a visually perceptible light image along predetermined vector coordinates, includes a light source for producing a beam of light along a light path; a deflector positioned to deflect the beam of light along the vector coordinates; a focusing lens for focusing the deflected light beam; and a projection reflector for reflecting the beam along the vector coordinates to thereby form the visually perceptible light image. A preferred light source comprises a laser, and a preferred reflecting surface has a substantially convex shape, preferably including a parabolic reflector. A method aspect of the invention includes producing a visually perceptible light image by predetermining vector coordinates defining the visually perceptible light image; generating a substantially parallel beam of light; modulating the beam of light by turning it off and on at predetermined time intervals; deflecting the modulated beam of light along the predetermined vector coordinates so as to produce a plurality of vectored light beams; focusing the plurality of vectored light beams to thereby substantially prevent distortion of the visually perceptible light image; and reflecting the plurality of focused light beams from a substantially convex reflecting surface along the predetermined vector coordinates to thereby produce the visually perceptible light image.

Claims

1. A light display projector for projecting a beam of light along a plurality of predetermined vector coordinates so as to produce a light pattern forming a visually perceptible light image, said projector comprising:

a light source for producing a beam of light extending along a light path;

at least one focusing lens positioned relative to the light path to focus the light beam;

a modulator positioned to modulate the intensity and color of the beam of light;

a deflector positioned adjacent the light path to deflect the beam of light along the plurality of predetermined vector coordinates; and

a projection reflector positioned to reflect the focused deflected light beam along the plurality of predetermined vector coordinates to thereby project the light pattern forming the visually perceptible light image.

2. The projector of claim 1, wherein said projection reflector comprises a substantially convex reflecting surface.

3. The projector of claim 1, wherein said projection reflector comprises a reflecting surface having a shape selected from spherical, hyperbolic, ellipsoid, and parabolic.

4. The projector of claim 1, wherein said projection reflector comprises a substantially conical reflecting surface.

5. The projector of claim 1, wherein said projection reflector comprises a plurality of reflecting surfaces.

6. The projector of claim 1, wherein the visually perceptible light image comprises monochromatic light.

7. The projector of claim 1, wherein the visually perceptible light image comprises polychromatic light.

8. The projector of claim 1, wherein the light path includes an optical fiber light conduit.

9. The projector of claim 1, further comprising at least one deflector selected from a galvanometric scanner, an acousto-optic beam deflector, an electro-optic beam deflector, a piezo-electric deflector, a digital micromirror device, and a grating light valve.

10. The projector of claim 1, wherein the projector is separable into at least two components, and wherein the light path connecting the at least two components comprises an optical fiber light conduit.

11. The projector of claim 1, wherein the visually perceptible light image is formed within about a 360°

azimuth surrounding said projection reflector and exceeding about 40°

of elevation therefrom.

12. The projector of claim 1, wherein the predetermined vector coordinates define an area of space shaped as a generally upright cylinder.

13. The projector of claim 1, wherein the predetermined vector coordinates define an area of space generally shaped as a truncated hemisphere.

14. The projector of claim 1, wherein the predetermined vector coordinates define an area of space wherein the visually perceptible light image appears to be in mid-air.

15. The projector of claim 1, wherein the predetermined vector coordinates define an area of space wherein the visually perceptible light image is formed simulating a light pattern created through a diffraction grating.

16. The projector of claim 1, wherein the light beam projected along the plurality of predetermined vector coordinates produces a plurality of simultaneously visually perceptible light images selected from a graphic image, a diffraction grating effect, and a static light beam, or a combination thereof.

17. The projector of claim 1, wherein the light beam projected along the plurality of predetermined vector coordinates produces at least one visually perceptible light image selected from a graphic image, a diffraction grating effect, and a static light beam.

18. The projector of claim 1, wherein the light path comprises a diameter of about 5 mm or smaller.

19. The projector of claim 1, wherein said at least one focusing lens is positioned relative to the light path downstream from said deflector for focusing the deflected light beam.