Illumination system with non-radially symmetrical aperture

• US 7,101,050 B2
• Filed: 05/14/2004
• Issued: 09/05/2006
• Est. Priority Date: 05/14/2004
• Status: Expired due to Fees

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Magarill, Simon, Rutherford, Todd S.
• Primary Examiner(s): Perkey, W. B.
• Assistant Examiner(s): Cruz, Magda
• Application Number:
  US10/845,673
• Publication Number:
  US 20050254019A1
• Time in Patent Office: 844 Days
• Field of Search: 353/97, 353/94, 353/31, 353 33- 34, 362/227, 362/234, 362/236, 362/551
• US Class Current: 353/97
• CPC Class Codes: G02B 27/0927 Systems for changing the beam intensity distribution, e.g. Gaussian to top-hat
• CPC Class Codes: G02B 27/0994 Fibers, light pipes optical fibers per se G02B6/02
• CPC Class Codes: G03B 21/2013 Plural light sources
• CPC Class Codes: G03B 21/208 Homogenising, shaping of the illumination light
• 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 9/3114 by using a sequential colour filter producing one colour at a time
• CPC Class Codes: H04N 9/3141 Constructional details thereof details not peculiar to the presence of an electronic spatial light modulator G03B21/14
• CPC Class Codes: H04N 9/3152 for shaping the light beam beam shaping per se G02B27/09

Abstract

Illumination systems are disclosed that include a light source or a bank of light sources having a non-radially symmetrical aperture having a longer dimension and a shorter dimension, such that the light source or bank of light sources produces illumination with a non-radially symmetrical angular intensity distribution having a larger angular dimension and a smaller angular dimension. The illumination systems include an integrator having an entrance end optically connected to the bank of light sources, an exit end, and a dimension that experiences a larger increase from the entrance end to the exit end. The integrator is disposed so that the dimension experiencing the larger increase is substantially aligned with the larger angular dimension of the illumination produced at the entrance end of the integrator.

Claims

1. An illumination system, comprising:

a light source having a non-radially symmetrical aperture, the aperture having a longer dimension and a shorter dimension, the light source producing illumination with a non-radially symmetrical angular intensity distribution having a larger angular dimension and a smaller angular dimension; and

an integrator having an entrance end optically connected to the light source and an exit end having a longer dimension and a shorter dimension, the integrator being disposed so that the longer dimension of the exit end is substantially aligned with the larger angular dimension of the illumination produced by the light source at the entrance end of the integrator.

2. The illumination system as recited in claim 1, wherein the exit end of the integrator is generally rectangular, the entrance end of the integrator is generally square, and the aperture is generally elliptical.

3. The illumination system as recited in claim 1, further comprising one or more of:

a relay optic, a TIR prism, a PBS, a polarizer and a fold mirror, optically connected to the exit end of the integrator.

4. The illumination system as recited in claim 1, further comprising an illumination target optically connected to the exit end of the integrator and relay optics disposed between the illumination target and the exit end of the integrator, wherein the relay optics are configured to image the exit end of the integrator onto the illumination target.

5. The illumination system as recited in claim 1, further comprising an illumination target having a shape and optically connected to the exit end of the integrator, wherein the exit end of the integrator has a shape that substantially matches the shape of the illumination target.

6. An illumination system, comprising:

a bank of light sources having a non-radially symmetrical aperture, the aperture having a longer dimension and a shorter dimension, the light source producing illumination with a non-radially symmetrical angular intensity distribution having a larger angular dimension and a smaller angular dimension; and

an integrator having an entrance end optically connected to the bank of light sources and an exit end having a longer dimension and a shorter dimension, the integrator being disposed so that the longer dimension of the exit end is substantially aligned with the larger angular dimension of the illumination produced by the bank of light sources at the entrance end of the integrator.

7. The illumination system as recited in claim 6, wherein the bank of light sources comprises a plurality of light sources and a plurality of refractive optical elements.

8. The illumination system as recited in claim 7, wherein each of the plurality of light sources has an emitting surface and the refractive elements are configured to image at least some of the emitting surfaces onto the entrance end of the integrator.

9. The illumination system as recited in claim 8, wherein the entrance end of the integrator has a first shape and each of the emitting surfaces of the plurality of light sources has a second shape that substantially matches the first shape.

10. The illumination system as recited in claim 7, wherein the plurality of light sources and the plurality of refractive optical elements are configured so that a different refractive optical element is associated with each light source.

11. The illumination system as recited in claim 6, wherein the bank of light sources comprises a plurality of light sources and a plurality of refractive optical elements, and wherein the light sources and the refractive elements are configured to form a plurality of aimed-in channels.

12. The illumination system as recited in claim 6, wherein the exit end of the integrator is generally rectangular, the entrance end of the integrator is generally square, and the aperture is generally elliptical.

13. The illumination system as recited in claim 6, further comprising one or more of:

a relay optic, a TIR prism, a PBS, a polarizer and a fold mirror, optically connected to the exit end of the integrator.

14. The illumination system as recited in claim 6, further comprising an illumination target optically connected to the exit end of the integrator and relay optics disposed between the illumination target and the exit end of the integrator, wherein the relay optics are configured to image the exit end of the integrator onto the illumination target.

15. The illumination system as recited in claim 6, further comprising an illumination target having a shape and optically connected to the exit end of the integrator, wherein the exit end of the integrator has a shape that substantially matches the shape of the illumination target.

16. The illumination system as recited in claim 6, wherein the bank of light sources includes light sources of different color shades.

17. The illumination system as recited in claim 6, wherein the bank of light sources includes a plurality of light sources of a first shade, a plurality of light sources of a second shade and a dichroic combiner for combining light of the first and second shades.

18. The illumination system as recited in claim 17, wherein the light sources of the first shade emit light with a first peak wavelength and the light sources of the second shade emit light with a second peak wavelength, and wherein the first and second peak wavelengths are separated by no more than about 40 nm.

19. An illumination system, comprising:

a plurality of banks of light sources, each bank of light sources having a non-radially symmetrical aperture with a longer dimension and a shorter dimension and producing illumination with a non-radially symmetrical angular intensity distribution having a larger angular dimension and a smaller angular dimension; and

an integrator having an entrance end optically connected to the banks of light sources and an exit end having a longer dimension and a shorter dimension, the integrator and the banks of light sources being disposed so that the longer dimension of the exit end of the integrator is substantially aligned with each larger angular dimension of the illumination produced by each bank of light sources at the entrance end of the integrator.

20. The illumination system as recited in claim 19, wherein at least one of the banks of light sources comprises a plurality of light sources and a plurality of refractive optical elements.

21. The illumination system as recited in claim 20, wherein each of the plurality of light sources has an emitting surface and the refractive elements are configured to image at least some of the emitting surfaces onto the entrance end of the integrator.

22. The illumination system as recited in claim 21, wherein the entrance end of the integrator has a first shape and each of the emitting surfaces has a second shape that substantially matches the first shape.

23. The illumination system as recited in claim 20, wherein the plurality of light sources and the plurality of refractive optical elements are configured so that a different refractive optical element is associated with each light source.

24. The illumination system as recited in claim 19, wherein at least one bank of light sources comprises a plurality of light sources and a plurality of refractive elements and wherein the light sources and the refractive elements are configured to form a plurality of aimed-in channels.

25. The illumination system as recited in claim 19, wherein the exit end of the integrator is generally rectangular, the entrance end of the integrator is generally square, and the aperture is generally elliptical.

26. The illumination system as recited in claim 19, further comprising one or more of:

a relay optic, a TIR prism, a PBS, a polarizer and a fold mirror, optically connected to the exit end of the integrator.

27. The illumination system as recited in claim 19, further comprising an illumination target optically connected to the exit end of the integrator and relay optics disposed between the illumination target and the exit end of the integrator, wherein the relay optics are configured to image the exit end of the integrator onto the illumination target.

28. The illumination system as recited in claim 19, further comprising an illumination target having a shape and optically connected to the exit end of the integrator, wherein the exit end of the integrator has a shape that substantially matches the shape of the illumination target.

29. The illumination system as recited in claim 19, wherein at least one of the banks of light sources includes light sources of different color shades.

30. The illumination system as recited in claim 19, wherein at least one of the banks of light sources includes a plurality of light sources of a first shade, a plurality of light sources of a second shade and a dichroic combiner for combining light of the first and second shades.

31. The illumination system as recited in claim 30, wherein the light sources of the first shade emit light with a first peak wavelength and the light sources of the second shade emit light with a second peak wavelength, and wherein the first and second peak wavelengths are separated by no more than about 40 nm.

32. The illumination system as recited in claim 19, wherein the banks of light sources produce illumination of different colors, and the illumination system further comprises a dichroic combiner configured for combining the illumination of different colors into the entrance end of the integrator.

33. The illumination system as recited in claim 32, wherein the dichroic combiner comprises a dichroic mirror rotated about a rotation axis substantially parallel to the entrance end of the integrator.

34. The illumination system as recited in claim 33, wherein the long dimensions of the apertures, the rotation axis and the long dimension of the exit end of the integrator are substantially aligned.

35. An illumination system, comprising:

a light source having a non-radially symmetrical aperture, the aperture having a longer dimension and a shorter dimension, the light source producing illumination with a non-radially symmetrical angular intensity distribution having a larger angular dimension and a smaller angular dimension; and

an integrator having an entrance end optically connected to the light source, an exit end, and a dimension that experiences a larger increase from the entrance end to the exit end, the integrator being disposed so that the dimension experiencing the larger increase is substantially aligned with the larger angular dimension of the illumination produced by the light source at the entrance end of the integrator.

36. An illumination system, comprising:

a bank of light sources having a non-radially symmetrical aperture, the aperture having a longer dimension and a shorter dimension, the light source producing illumination with a non-radially symmetrical angular intensity distribution having a larger angular dimension and a smaller angular dimension; and

an integrator having an entrance end optically connected to the bank of light sources, an exit end and a dimension that experiences a largest increase from the entrance end to the exit end, the integrator being disposed so that the dimension experiencing the larger increase is substantially aligned with the larger angular dimension of the illumination produced by the bank of light sources at the entrance end of the integrator.