Light projection system using randomized fiber optic bundle

• US 5,426,474 A
• Filed: 03/22/1994
• Issued: 06/20/1995
• Est. Priority Date: 03/22/1994
• Status: Expired due to Fees

• Current Assignee: Insense Inc.
• Original Assignee: Insense Inc.
• Inventors: Rubtsov, Vladimir, Young, Roger C.
• Primary Examiner(s): Cuchlinski, Jr., William A.
• Assistant Examiner(s): Dowling, William C.
• Application Number:
  US08/215,931
• Time in Patent Office: 455 Days
• Field of Search: 353/84, 353/122, 353/1, 353/46, 353/48, 353/49, 353/82, 353/42, 359/616, 362/32, 362/293
• US Class Current: 353/84
• CPC Class Codes: G02B 26/007 the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light
• CPC Class Codes: G02B 6/04 formed by bundles of fibres G02B6/24 takes precedence

Abstract

A projection system using a randomized fiber optic bundle for generating a wide variety of fluid visual images. A light source focusses light through a multiple color filter onto the input end of a fiber optic bundle having a plurality of optical fibers and held in a cylindrical shape. The fiber optic bundle includes a plurality of fiber optic groups that are interwoven such that the arrangement of the fiber optic groups at the fiber optic bundle'"'"'s input end is different from the arrangement of the fiber optic groups at the fiber optic bundle'"'"'s output end. The multiple color filter is movable such that light of time-varying color is directed into each of the optical fibers. The time-varying colored light is received by a projection lens and imaged at a target.

Claims

1. A fiber optic projection system, comprising:

a housing;

a light source;

a multiple color filter mounted in the housing to receive light from the light source and having a plurality of discrete colored regions;

a fiber optic bundle held in a predetermined shape and having a plurality of optical fibers forming an input end and an output end fixed in the housing, the fiber optic bundle including a plurality of fiber optic groups that are interwoven such that the arrangement of the fiber optic groups at the fiber optic bundle'"'"'s input end is different from the arrangement of the fiber optic groups at the fiber optic bundle'"'"'s output end;

wherein the fiber optic bundle is mounted such that light from the light source is directed through the multiple color filter onto the input end of the fiber optic bundle and wherein the multiple color filter is movable relative to the input end of the fiber optic bundle such that light of time-varying color is directed into each of the plurality of optical fibers; and

a projection lens for receiving light from the fiber optic bundle'"'"'s output end and imaging the light at a target.

2. The fiber optic projection system of claim 1, wherein the multiple color filter comprises a color wheel with a plurality of irregularly shaped colored regions.

3. The fiber optic projection system of claim 2, and further including:

a first motor for rotating the color wheel; and

a second motor for reciprocating the color wheel laterally with respect to the longitudinal axis of the fiber optic bundle.

4. The fiber optic projection system of claim 3, wherein the second motor is sized so that the color wheel moves in a range such that the center of the wheel and the periphery of the wheel are, at times, adjacent to the input end of the fiber optic bundle.

5. The fiber optic projection system of claim 3, wherein:

the color wheel is mounted for rotation between a plurality of rollers; and

the first motor drives one of the rollers.

6. The fiber optic projection system of claim 3, and further including:

a first heat sink for conducting heat away from the light source; and

a second heat sink for conducting heat away from the fiber optic bundle.

7. The fiber optic projection system of claim 2, wherein:

the irregularly shaped colored regions of the color wheel have a smallest cross-sectional dimension;

the fiber optic groups are of variable size, with the smallest of such groups having a smallest cross-sectional dimension;

the optical fibers all have substantially the same cross-sectional dimension;

the smallest cross-sectional dimension of the smallest fiber optic group is not less than the smallest cross-sectional dimension of the smallest colored region; and

the smallest cross-sectional dimension of the smallest colored region is not less than the cross-sectional dimension of the fibers.

8. The fiber optic projection system of claim 7, wherein the smallest cross-sectional dimension of the smallest fiber optic group is substantially equal to the smallest cross-sectional dimension of the smallest colored region.

9. The fiber optic projection system of claim 2, wherein the color wheel comprises a transparent glass disk with transparent colored materials affixed to the glass to disk to form a color mosaic.

10. The fiber optic projection system of claim 1, wherein:

the fiber optic groups are of variable size, with the smallest of such groups having a smallest cross-sectional dimension;

the optical fibers all have substantially the same cross-sectional dimension; and

the multiple color filter moves at a speed that satisfies the following equation;

space="preserve" listing-type="equation">L.sub.F /RR<

S<

L.sub.FOG /RR

where L_F is the cross-sectional dimension of the fibers, RR is the response and relaxation time of the human eye, S is the speed at which the multiple color filter moves, and L_FOG is the smallest cross-sectional dimension of the smallest fiber optic group.

11. The fiber optic projection system of claim 1, and further including a color filter mounting plate for shielding the multiple color filter from heat from the light source, mounted in the housing between the light source and the multiple color filter, the mounting plate being opaque and having an aperture through which light from the light source passes.

12. The fiber optic projection system of claim 1, wherein the projection lens is mounted directly onto the output end of the fiber optic bundle.

13. The fiber optic projection system of claim 1, wherein the orientation of at least one fiber optic group at the output end of the fiber optic bundle is rotated from its orientation at the input end of the fiber optic bundle.

14. The fiber optic projection system of claim 1, wherein the light source is mounted within the housing.

15. The fiber optic projection system of claim 1, wherein the fiber optic bundle is held in a cylindrical shape.

16. A fiber optic projection system, comprising:

a housing;

a light source mounted within the housing;

a multiple color wheel mounted in the housing having a plurality of irregularly shaped colored regions having a smallest cross-sectional dimension;

a fiber optic bundle held in a cylindrical shape and having a plurality of optical fibers of substantially uniform cross-sectional dimension, forming an input end and an output end fixed in the housing, the fiber optic bundle including a plurality of fiber optic groups that are interwoven such that the arrangement of the fiber optic groups at the fiber optic bundle'"'"'s input end is different from the arrangement of the fiber optic groups at the fiber optic bundle'"'"'s output end, wherein the fiber optic groups are of variable size, with the smallest of such groups having a smallest cross-sectional dimension;

wherein the multiple color wheel is mounted between the light source and the input end of the fiber optic bundle;

wherein the smallest cross-sectional dimension of the smallest fiber optic group is not less than the smallest cross-sectional dimension of the smallest colored region, and the smallest cross-sectional dimension of the smallest colored region is not less than the cross-sectional dimension of the fibers;

a first motor for rotating the color wheel;

a second motor for reciprocating the color wheel laterally with respect to the longitudinal axis of the fiber optic bundle; and

a projection lens for receiving light from the fiber optic bundle'"'"'s output end and imaging the light at a remote location.