Line light source

• US 5,033,814 A
• Filed: 08/11/1989
• Issued: 07/23/1991
• Est. Priority Date: 04/10/1989
• Status: Expired due to Fees

• Current Assignee: Nilford Laboratories Incorporated
• Original Assignee: Nilford Laboratories Incorporated
• Inventors: Brown, Wendell D., Glaser, William T.
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): Wise, Robert E.
• Application Number:
  US07/392,631
• Time in Patent Office: 711 Days
• Field of Search: 350/96.24, 350/96.25
• US Class Current: 385/16
• CPC Class Codes: H04N 1/113 using oscillating or rotating mirrors
• CPC Class Codes: H04N 1/193 using electrically scanned linear arrays , e.g. linear CCD arrays
• CPC Class Codes: H04N 1/40037 the reproducing element being a laser
• CPC Class Codes: H04N 3/08 having a moving reflector
• CPC Class Codes: H04N 5/7416 involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal

Abstract

An apparatus for producing a pixel-modulated line light source from a point light source in which a fiber optic bundle formed of individual fibers arranged in a cylindrical array forming a tip at one end and having the individual fibers spread to a substantially flat line of fibers at the other end optically coupled with an optical shutter means which is constructed of an array of aperture cells disposd in a straight line region aligned with the flat line of fibers. The transmissivity of the aperture cells is individually controllable by electrical signals.

Claims

1. An apparatus for producing a pixel-modulated line light source from a point light source comprising:

fiber optic bundle means formed of individual fibers having a first end and a second end, said first end having said individual fibers arranged in a cylindrical array forming a first tip and being disposed to intercept light impinging thereon, said second end having said individual fibers spread to an arrangement of a generally flat line of fibers, said second end being disposed to direct light through said fibers to an optical shutter means; and

an optical shutter means, said optical shutter means comprising an array of aperture cells disposed in an aperture region juxtaposed to and substantially aligned with said flat line of fibers, wherein a common optical property of each one of said aperture cells is individually controllable by means of control signals.

2. The apparatus according to claim 1 wherein said point light source is an arc lamp.

3. The apparatus according to claim 1 wherein said point light source is a laser.

4. The apparatus according to claim 1 further including video signal generating means, said optical shutter means being coupled to said video signal generating means for responding to a video control signal.

5. The apparatus according to claim 1 further comprising means for projecting and variably deflecting said modulated light.

6. The apparatus according to claim 1 wherein said light directed through said fibers is imaged onto said optical shutter means by an imaging optic.

7. The apparatus according to claim 6 wherein said imaging optic is astigmatic.

8. The apparatus according to claim 1 further including:

rod means comprising an optically transmissive cylinder having a receiving end, a transmitting end and an inner wall, said inner wall being substantially totally internally reflective of light, said rod means being disposed to abut said first tip and aligned to receive impinging light from said point light source and to direct said impinging light into said first tip.

9. The apparatus according to claim 8, wherein said rod means is hollow.

10. The apparatus according to claim 8, wherein said receiving end is a lens.

11. The apparatus according to claim 8, wherein said rod means has a circular cross section.

12. The apparatus according to claim 8, wherein said rod means has a substantially flat cross section.

13. The apparatus according to claim 1, wherein said aperture cells are of a uniform size in the same order of magnitude as the cross section of one of said individual fibers.

14. The apparatus according to claim 1, wherein said aperture cells are disposed in one-to-one correspondence with individual ones one of said individual fibers.

15. The apparatus according to claim 1, wherein said aperture cells are of a uniform size and are larger than the cross section of one of said individual fibers.

16. The apparatus according to claim 1, wherein said array of aperture cells arranged in said aperture region are disposed having centers along a common line.

17. The apparatus according to claim 1, wherein said array of aperture cells arranged in said aperture region are disposed having centers along one of a plurality of parallel lines.

18. The apparatus according to claim 17, wherein adjacent aperture cells are disposed having centers along alternating ones of two parallel lines.

19. The apparatus according to claim 1, wherein said array of aperture cells comprise:

an optically active material forming a slab having a first face and a second face, said optically active material being responsive to an electric field to change birefringence, affecting polarization, for control of transmissivity in an orifice region between oppositely-polarized electrodes;

a first electrode associated with each one of said aperture cells, said first electrode having a first margin mounted to said substrate and juxtaposed to an orifice region of said one of said aperture cells; and

a second electrode common to each one of said aperture cells, said second electrode having a second margin mounted to said substrate and juxtaposed to said orifice region of said one of said aperture cells opposing said first margin.

20. The apparatus according to claim 1, wherein said array of aperture cells comprise:

an optically active material forming a slab having a first face and a second face, said optically active material being responsive to an electric field to change birefringence, affecting polarization, for control of transmissivity in an orifice region between oppositely-charged electrodes;

a first electrode associated with each one of said aperture cells, said first electrode having a first margin mounted to said substrate and juxtaposed to an orifice region of said one of said aperture cells; and

a second electrode associated with each one of said aperture cells, said second electrode having a second margin mounted to said substrate and juxtaposed to said orifice region of said one of said aperture cells opposing said first margin.

21. The apparatus according to claim 20, wherein said aperture cells are disposed having centers along a plurality of parallel lines within said aperture region such that no two aperture cells are adjacent one another on a common parallel line.

22. The apparatus according to claim 19, wherein said aperture region comprises two parallel lines of aperture cells.

23. An apparatus for producing a pixel-modulated line light source from a point light source comprising:

fiber optic bundle means formed of individual fibers having a first end and a second end, said first end having said individual fibers arranged in a cylindrical array forming a first tip and being disposed to intercept light impinging thereon, said second end having said individual fibers spread to an arrangement of a generally flat line of fibers, said second end being disposed to direct light through said fibers to an optical shutter means; and

an optical shutter means, said optical shutter means comprising an array of aperture cells disposed in an aperture region juxtaposed to and substantially aligned with said flat line of fibers, wherein a common optical property of each one of said aperture cells is individually controllable by means of control signals, wherein said cells of said optical shutter means form a substantially straight line wherein electric fields between opposing electrode edges are oriented at forty-five degrees to the straight line of said cells such that each electrode serves two cells and said electric fields in the plane of the electrode are oriented at forty-five degrees to the axis of polarization P1 or P2 of illumination directed through the cells.

24. A fiber optic conduit for transmitting optical energy from a point source to a line target comprising:

a bundle of individual fibers having a first end and a second end, said first end having said individual fibers arranged in a cylindrical array forming a first tip approximating a point and being disposed to intercept light impinging thereon and originating from a point light source, said second end having said individual fibers spread to an arrangement of a substantially flat line of fibers aligned to direct optical energy through a lens aperture; and

rod means comprising an optically transmissive cylinder having a receiving end, a transmitting end and an inner wall, said inner wall being substantially totally internally reflective of light, said rod means being disposed to abut said first tip and aligned to receive impinging light from said point light source and to direct said impinging light into said first tip, said receiving end forming a lens.

25. The apparatus according to claim 24, wherein said rod means has a substantially flat cross section.

26. The apparatus according to claim 24, wherein said rod means is hollow.

27. The apparatus according to claim 24, wherein said rod means has a circular cross section.