Light source having automatically variable hue, saturation and beam divergence

• US 4,602,321 A
• Filed: 02/28/1985
• Issued: 07/22/1986
• Est. Priority Date: 02/28/1985
• Status: Expired due to Term

• Current Assignee: Vari-Lite, Inc. (Koninklijke Philips N.V.)
• Original Assignee: Vari-Lite, Inc. (Koninklijke Philips N.V.)
• Inventors: Bornhorst, James M.
• Primary Examiner(s): Myhre, Charles J.
• Assistant Examiner(s): Okonsky, David A.
• Application Number:
  US06/706,720
• Time in Patent Office: 509 Days
• Field of Search: 362/231, 362/232, 362/238, 362/239, 362/285, 362/293, 362/305, 362/319, 362/270, 362/273, 362/281, 362/282, 362/283, 362/289, 362/268, 362/322, 362/324
• US Class Current: 362/268
• CPC Class Codes: F21V 14/02 by movement of light sources in vehicle head lamps F21S41/657
• CPC Class Codes: F21V 14/08 by movement of the screens or filters
• CPC Class Codes: F21V 9/40 with provision for controlling spectral properties, e.g. colour, or intensity
• CPC Class Codes: F21W 2131/406 for theatres, stages or film studios

Abstract

A variable light source includes a light (14) which projects a white light beam. Three filters sets (60, 62 and 64) each include three pivotable dichroic filter elements. Each element is rotatable around an axis perpendicular to the light beam in order to vary the angle of incidence to vary the hue of the light beam. Rotation of the filter elements also varies the white light transmitted past the filter elements in order to vary the saturation of the light. The distance between the light source (26) and the reflector (28) may be varied to change the divergence of the light beam.

Claims

1. A light assembly comprising:

means for projecting a light beam;

a filter set including at least two filters, said set having each filter mounted on a means for pivoting, each said means for pivoting being rotatable about respective axes which are disposed perpendicular to said light beam and are in a common plane which is generally transverse to said light beam; and

said means for pivoting including means for concurrently pivoting said filters to selectively vary the angle of incidence of said light beam upon said filters to vary the resulting saturation and hue of said light beam.

2. The light assembly of claim 1 wherein said axes of said means for pivoting are spaced apart by a distance less than a width of one of said filters such that edges of said filters overlap when said filters are parallel.

3. The light assembly of claim 1 wherein said filters are spaced relative to one another such that the amount of light passing outside and between said filters is varied as said filters are pivoted, such that the saturation of the resulting light beam is varied.

4. The light assembly of claim 1 wherein said filter set comprises three rectangular filters.

5. The light assembly of claim 1 wherein said means for pivoting causes each said filter to rotate in an opposite angular direction from the adjacent ones of said filters.

6. The light assembly of claim 1 wherein said filters comprise dichroic filters.

7. The light assembly of claim 1 further comprising:

a second filter set similar to said first filter set and spaced apart from and parallel to said at least two filters.

8. The light assembly of claim 1 wherein said means for projecting a light source comprises a lamp and a reflector;

and

means for varying the relationship of said lamp to said reflector to vary the divergence of said light beam.

9. The light assembly of claim 1 wherein said means for concurrently pivoting said filters drives said filters between a first position having said filters transverse to said light beam for intercepting substantially all of said light beam and a second position having said filters parallel to said light beam for passing substantially all of said light beam outside and between said filters.

10. A light assembly comprising:

means for projecting a light beam;

at least two filter elements, each filter element mounted on a means for pivoting, each said means for pivoting being rotatable, about spaced apart axes disposed perpendicular to said light beam, said filter elements concomitantly pivotal between first and second positions, said filter elements in said first position oriented in a side-by-side relationship such that said filter elements are generally perpendicular to said light beam, said filter elements in said second position being oriented generally parallel to the light beam;

a second set of three filter elements, said second set having each filter mounted on a means for pivoting, each said means for pivoting being rotatable about an axis disposed perpendicular to said light beam, said second set spaced apart from said at least two filter elements;

a third set of pivotal filter elements spaced apart from and parallel to said at least two filter elements; and

means for pivoting said second set of filter elements to any position between said first and second positions in order to selectively vary the angle of incidence of said light beam upon said filter elements to vary the resulting saturation and hue of said light beam.

11. The light assembly of claim 10 wherein said means for projecting a light beam comprises a lamp and a reflector;

and further comprising;

means for varying the relationship of said lamp to said reflector to vary the divergence of said light beam.

12. A light assembly comprising:

means for projecting a light beam;

a plurality of dichroic filters disposed transversely across a path of said light beam;

each of said filters being mounted on a means for pivoting, each said means for pivoting being rotatable about respective axes which are perpendicular to said light beam and are spaced transversely across the path of said light beam; and

said means for pivoting including means for concomitantly rotating said filters about said axes such that the angles of incidence of said filters to said light beam are varied equally for each said filter, said filters being rotatable from positions which totally intercept said light beam to positions which permit portions of said light beam to pass unintercepted between said filters.

13. The light assembly of claim 12 and further comprising a second plurality of dichroic filters disposed transversely across the path of said light beam and spaced apart from said plurality of dichroic filters in said light beam;

and

means for concomitantly rotating said second plurality of dichroic filters to vary the angle of incidence of said second plurality of said filters to said light beam.

14. The light assembly of claim 12 wherein said means for projecting a light beam comprises a lamp and a reflector;

and further comprising;

means for varying the relationship of said lamp to said reflector to vary the divergence of said light beam.

15. The light assembly of claim 12 wherein said one filter and said other filters are connected to gears which serially mesh with one another, rotation of one gear causing the other gears to concomitantly rotate.

16. The light assembly of claim 15 wherein said gears rotate in different directions to rotate said one filter and said other filters in different directions.

17. The light assembly of claim 15 wherein said other filters are mounted at offset locations on said gears.

18. The light assembly of claim 15 wherein said means for rotating rotates only one of said gears, such rotation causing rotation of the remaining gears in an opposite direction.

19. The light assembly of claim 15 wherein said gears are offset relative to one another.

20. The light assembly of claim 19 wherein said gears are offset from one another by an angle equal to 360n/2T, where n=1/2, 11/2, 21/2, . . . and T=number of teeth on each gear.

21. A light assembly comprising:

means for projecting a light beam;

a plurality of dichroic filters disposed across said light beam;

each of said filters being mounted on a means for pivoting, each said means for pivoting being rotatable about spaced apart axes perpendicular to said light beams;

said means for pivoting including means for concomitantly rotating said filters about said axes such that the angles of incidence of said filters to said light beam are varied equally for each said filter; and

one of said filters is disposed centrally of said light beam and others of said filters are disposed on opposite sides of said one filter, edge portions of said one filter and said other filters overlapping one another when said one filter and said other filters are rotated to a position perpendicular to said light beam.

22. The light assembly of claim 21 wherein said means for projecting a light beam comprises a lamp and a reflector;

and further comprising;

means for varying the relationship of said lamp to said reflector to vary the divergence of said light beam.

23. A light assembly comprising:

means for projecting a light beam;

a first plurality of dichroic filters disposed across said light beam;

said filters being mounted on a means for pivoting, each said means for pivoting being rotatable about spaced apart axes perpendicular to said light beam;

said means for pivoting including means for concomitantly rotating said first plurality of dichroic filters such that the angles of incidence of said filters to said light beam are varied equally for each said filter;

a second plurality of dichroic filters spaced apart from said first plurality of dichroic filters in said light beam;

means for concomitantly rotating said second plurality of dichroic filters to vary the angle of incidence of said filters to said light beam;

a third plurality of dichroic filters spaced apart from said second plurality of dichroic filters in said light beam; and

means for concomitantly rotating said third plurality of dichroic filters to vary the angle of incidence of said filters to said light beam.

24. The light assembly of claim 23 wherein said means for projecting a light beam comprises a lamp and a reflector;

and further comprising;

means for varying the relationship of said lamp to said reflector to vary the divergence of said light beam.

25. A light assembly having variable color comprising:

means for projecting a light beam;

a plurality of dichroic filters disposed side by side across said light beam;

means for pivoting each of said filters in order to vary the angle of incidence of said filters to said light beam; and

edge portions of said filters overlapping one another when said filters are pivoted perpendicular to said light beam to form a continuous filter across said light beam.

26. The light assembly of claim 25 wherein each of said filters is pivoted by an equal amount such that the angle of incidence of each of said filters is equal to said light beam.

27. The light assembly of claim 25 wherein one of said filters is centrally disposed in said light beam and a filter is disposed on each side of said centrally disposed filter, said means for pivoting simultaneously pivoting each of said filters by equal amounts relative to said light beam.

28. The light assembly of claim 25 wherein said means for projecting a light beam comprises a lamp and a reflector;

and further comprising;

means for varying the relationship of said lamp to said reflector to vary the divergence of said light beam.

29. The light assembly of claim 25 wherein said filters may be rotated to allow variable amounts of light to pass by said filters to vary the saturation of the resulting light beam.

30. The light assembly of claim 29 wherein said variable amounts of light are passed by said filters in a manner to eliminate the requirement of integration means.

31. The light assembly of claim 25 wherein said filters are connected to gears which mesh with one another, rotation of one gear causing the other gears to concomitantly rotate.

32. The light assembly of claim 31 wherein said gears rotate in different directions to rotate said filters in different directions.

33. The light assembly of claim 31 wherein ones of said filters are mounted at offset locations on said gears.

34. The light assembly of claim 31 wherein said gears are offset relative to one another.

35. The light assembly of claim 34 wherein said gears are offset from one another by an angle equal to 360n/2T, where n=1/2, 11/2, 21/2, . . . and T=number of teeth on each gear.

36. A method of varying the hue and saturation of a beam of light, comprising the steps of:

projecting a light beam;

disposing a plurality of dichroic filters across said light beam, said filters being mounted on a means for pivoting, each said means for pivoting being rotatable about spaced apart axes perpendicular to said light beam, said axes positioned in a plane essentially transverse to the path of said light beam; and

concomitantly rotating said filters about said axes such that the angles of incidence of said filters to said light beam are varied equally for each said filter.

37. The light assembly of claim 36 and further comprising:

disposing a second plurality of dichroic filters spaced apart from said plurality of dichroic filters in said light beam; and

concomitantly rotating said second plurality of dichroic filters to vary the angle of incidence of said second plurality of filters to said light beam.

38. The method of claim 36 wherein said filters can be set such that each said filter intercepts a different portion of said light beam and said filters can be set to pass unintercepted portions of said light beam outside and between said filters.

39. The method of claim 36 wherein the step of projecting a light beam comprises generating light from a lamp and directing said light by use of a reflector to form said light beam and further comprising the step of varying the relationship of said lamp to said reflector to vary the divergence of said light beam.

40. A method of varying the hue and saturation of a beam of light comprising:

projecting a light beam;

disposing a plurality of dichroic filters side by side across said light beam, said filters being mounted on a means for pivoting, each said means for pivoting being rotatable about spaced apart axes perpendicular to said light beam;

concomitantly rotating said filters about said axes such that the angles of incidence of said filters to said light beam are varied equally for each said filters, and

disposing one of said filters centrally in said light beam and others of said filters on opposite sides of said one filter, the edge portions of said filters overlapping one another when said filters are rotated to a position perpendicular to said light beam.

41. The method of varying the hue and saturation of a beam of light as recited in claim 40 further comprising:

connecting said filters to gears which mesh with one another, rotation of one gear causing the other gears to concomitantly rotate.

42. The method of varying the hue and saturation of a beam of light as recited in claim 40 wherein rotation of said one gear causes rotation of the remaining gears in an opposite direction.

43. The method of claim 40 wherein the step of projecting a light beam comprises generating light from a lamp and directing the light into a beam by use of a reflector and further comprising the step of:

varying the relationship of said lamp to said reflector to vary the divergence of said light beam.

44. The method of varying the hue and saturation of a beam of light, comprising the steps of:

projecting a white light beam;

varying the angle of incidence of a plurality of filters in said light beam, said filters being mounted on a means for pivoting, each said means for pivoting being rotatably positioned along a line generally transverse to said light beam, in order to vary the hue of the resulting light beam; and

varying the amount of white light passed between said filters and outside said filters in order to vary the saturation of the resulting light beam while maintaining the homogenization of the resulting light beam.

45. The method of claim 44 wherein the step of projecting a white light beam comprises generating light by use of a lamp and projecting said beam from a reflector and further comprising the step of:

varying the relationship of said lamp to said reflector to vary the divergence of said light beam.

46. A light assembly comprising:

means for projecting a light beam;

at least two filter elements, each filter element mounted on a means for pivoting, each said means for pivoting being rotatable, about spaced apart axes disposed perpendicular to said light beam, said filter elements concomitantly pivotal between first and second positions, said filter elements in said first position oriented in a side-by-side relationship such that said filter elements are generally perpendicular to said light beam, said filter elements in said second position being oriented generally parallel to the light beam;

a second set of at least two filter elements, said second set having each filter mounted on a means for pivoting, each said means for pivoting being rotatable about an axis disposed perpendicular to said light beam, said second set spaced apart from said at least two filter elements;

a third set of pivotal filter elements spaced apart from and parallel to said at least two filter elements; and

means for pivoting said second set of filter elements to any position between said first and second positions in order to selectively vary the angle of incidence of said light beam upon said filter elements to vary the resulting saturation and hue of said light beam.

47. A light assembly, comprising:

means for projecting a light beam along an axis;

a filter set including at least two filters, said filters lying within respective planes and positioned in said light beam to intercept a different portion of said light beam;

wherein the portion of said light beam which passes through one of said filters does not pass through the others of said filters; and

means for pivoting said filters to selectively vary an inclusive angle between each said respective plane and said light beam axis to change the resulting saturation and hue of said light beam.