Camera-mounted dimmable lighting apparatus

• US 8,025,417 B2
• Filed: 03/30/2009
• Issued: 09/27/2011
• Est. Priority Date: 09/07/2001
• Status: Expired due to Fees

• Current Assignee: Litepanels LLC (Litepanels)
• Original Assignee: Litepanels LLC (Litepanels)
• Inventors: Fisher, Ken S., Pohlert, Rudy G., Grosswendt, Pat, Baxter, Kevin
• Primary Examiner(s): TON, ANABEL
• Application Number:
  US12/414,643
• Publication Number:
  US 20090268426A1
• Time in Patent Office: 911 Days
• Field of Search: 362/6, 362/9, 362/11, 362/17, 362/800, 362/249.02, 362/249.11, 362/230, 362/231, 396/199, 396/431, 396/155
• US Class Current: 362/9
• CPC Class Codes: F21S 9/02 the power supply being a battery or accumulator
• CPC Class Codes: F21V 14/06 by movement of refractors in vehicle head lamps F21S41/635
• CPC Class Codes: F21V 19/001 the light sources being semiconductors devices, e.g. LEDs
• CPC Class Codes: F21V 21/0885 for portable lighting devices
• CPC Class Codes: F21V 21/116 Fixing lighting devices to arms or standards F21V21/002 takes precedence
• CPC Class Codes: F21W 2131/406 for theatres, stages or film studios
• CPC Class Codes: F21Y 2103/00 Elongate light sources, e.g. fluorescent tubes
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G03B 15/02 Illuminating scene
• CPC Class Codes: G03B 15/05 Combinations of cameras with electronic flash apparatus; Electronic flash units
• CPC Class Codes: G03B 2215/0539 Ringflash
• CPC Class Codes: H04N 23/56 provided with illuminating means
• CPC Class Codes: H04N 23/74 by influencing the scene brightness using illuminating means
• CPC Class Codes: H05B 45/00 Circuit arrangements for operating light-emitting diodes [LED]
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: H05B 47/155 Coordinated control of two or more light sources
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

A lighting apparatus comprises a light panel having a panel frame, and a plurality of LEDs or other light elements secured to the panel frame. A self-contained battery unit securably attaches to the outside of the panel frame. The light panel may have a dimmer switch, and may also be capable of receiving power from a source other than the self-contained battery unit. The lighting apparatus can be mounted to a camera or a stand through adapters. Diffusion lenses or color gels can be integrated with or detachable from the light panel. The lighting apparatus may conveniently be provided in the form of a kit, with one or more of a light panel, self-contained battery unit, compact stand, connecting cable(s), adapter(s), lenses or color gels, and so on, provided in a single package.

Claims

1. An area illumination system for lighting a subject for film, photography or video, the illumination system comprising:

a narrow profile portable frame having a mounting surface, said portable frame adapted for temporary mounting to a movable camera apparatus such that the portable frame follows the movements of the camera apparatus, said portable frame being readily detachable from the camera apparatus;

a plurality of semiconductor light elements disposed on the mounting surface of the portable frame and arranged such that the illumination therefrom is not focused solely on a single point or single central axis, so as to provide continuous illumination for the subject; and

a dimmer integrated with said portable frame, said dimmer configured to provide manual adjustment of an electrical signal provided to said semiconductor light elements.

2. The illumination system of claim 1, wherein said plurality of semiconductor light elements comprise light emitting diodes (LEDs).

3. The illumination system of claim 2, wherein said LEDs output light over a color temperature range suitable for image capture.

4. The illumination system of claim 2, wherein said LEDs are high output.

5. The illumination system of claim 4, wherein said LEDs are rated at or above 3 Watts.

6. The illumination system of claim 2, further comprising power electronics integrated with said frame, said power electronics configured to convert electrical power from an input power source to a level suitable for said LEDs.

7. The illumination system of claim 6, wherein said power electronics provide DC power to said LEDs whereby, when a subject has been recorded on a recording medium while being illuminated by light output from the LEDs, flickering is not visually detectable upon playback of the recording medium.

8. The illumination system of claim 6, wherein said power electronics provide a constant voltage level to said LEDs for a selected illumination intensity.

9. The illumination system of claim 6, wherein said power electronics provide a constant current to said LEDs for a selected illumination intensity.

10. The illumination system of claim 9, wherein said power electronics comprise a switched mode power regulator for providing the constant current level to said LEDs.

11. The illumination system of claim 10, and wherein the input power source comprises a DC power source.

12. The illumination system of claim 10, further comprising a current sensor for providing feedback information used in maintaining the output current to said LEDs at a stable level for a selected illumination intensity.

13. The illumination system of claim 6, wherein said power electronics are configured to receive electrical power from a self-contained battery unit, said self-contained battery unit comprising a housing enclosing a battery and being releasably attachable to an external portion of said frame.

14. The illumination system of claim 13, wherein said power electronics are further configured to receive power from an external power source.

15. The illumination system of claim 14, wherein said self-contained battery unit is rechargeable when the power electronics are coupled to said external power source.

16. The illumination system of claim 13, wherein the external power source comprises an AC power source, and wherein said power electronics comprise an AC-to-DC power converter.

17. The illumination system of claim 6, wherein said portable frame comprises heat dissipating extensions to release heat generated by said LEDs or said power electronics.

18. The illumination system of claim 1, wherein the illumination intensity of said semiconductor light elements is controlled by a digital command.

19. The illumination system of claim 18, further comprising an onboard digital processor for controlling the adjustment of the illumination intensity of said semiconductor light elements in response to said integrated dimmer.

20. The illumination system of claim 1, wherein said portable frame comprises a rectangular panel-shaped member on which said semiconductor light elements are disposed.

21. The illumination system of claim 1, wherein said integrated dimmer is adjustable via a manually actuatable control knob, dial, switch, keypad, or set of digital buttons.

22. The illumination system of claim 1, wherein at least a majority of said LEDs are oriented on the portable frame such that a primary center axis of light emitted from the LEDs is directed perpendicularly from said portable frame, thereby providing forward-projected continuous illumination over a wide area to illuminate the subject.

23. The illumination system of claim 1, further comprising an integrated power source contained within or secured to said frame.

24. The illumination system of claim 23, wherein said integrated power source comprises a battery.

25. The illumination system of claim 1, wherein said mounting surface comprises a circuit board, and wherein said semiconductor light elements are mounted directly on said circuit board.

26. The illumination system of claim 25, wherein said circuit board is an aluminum core circuit board.

27. The illumination system of claim 25, further comprising a plurality of heat-dissipating fins abutting, and thermally coupled to, said circuit board.

28. The illumination system of claim 1, wherein said semiconductor light elements include a first group of light emitting diodes (LEDs) outputting light over a continuous spectrum daylight color temperature range, and a second group of LEDs outputting light over a continuous spectrum Tungsten color temperature range.

29. The illumination system of claim 28, further comprising a manual control for adjusting a ratio of illumination between the daylight color temperature LEDs and the tungsten color temperature LEDs.

30. The illumination system of claim 1, further comprising a shoe adapter whereby said light panel mounts to the top of the camera apparatus.

31. The illumination system of claim 1, further comprising a frame housing having a back housing portion disposed behind said mounting surface, said back housing portion having a receptacle for receiving a mounting bracket whereby said portable frame is mountable to the camera apparatus.

32. The illumination system of claim 1, wherein said semiconductor light elements are disposed on a plurality of light strips, each light strip having an equal number of semiconductor light elements, said light strips attached to said mounting surface of the portable frame.

33. The illumination system of claim 1, further comprising a detachable composite lens having a plurality of discrete lens elements for individually focusing light from each of the individual semiconductor light elements.

34. A wide area, camera-mounted illumination system for lighting a subject for film, photography or video, the illumination system comprising:

a portable frame having a mounting surface and adapted for temporary mounting to a movable camera apparatus and being readily detachable therefrom;

a plurality of semiconductor light elements disposed on the mounting surface of the portable frame so as to provide continuous, wide area, forward-projected illumination for the subject;

a power receptor for receiving electrical power from a detachable DC power source that physically attaches to and moves with the portable frame; and

an onboard adjustable dimmer, said adjustable dimmer configured to allow manual selection of an electrical signal provided to said semiconductor light elements.

35. The illumination system of claim 34, wherein said plurality of semiconductor light elements comprise light emitting diodes (LEDs).

36. The illumination system of claim 35, wherein said LEDs output light over a color temperature range suitable for image capture, said color temperature range covering at least a continuous spectrum daylight or Tungsten color temperature range.

37. The illumination system of claim 35, wherein said LEDs are high output.

38. The illumination system of claim 35, wherein said LEDs are rated at or above 3 Watts, and wherein said frame comprises heat dissipating extensions to dissipate heat generated by said LEDs.

39. The illumination system of claim 35, further comprising power electronics integrated with said frame, said power electronics configured to convert electrical power from an input power source to a level suitable for said LEDs.

40. The illumination system of claim 39, wherein said power electronics provide DC power to said LEDs whereby, when a subject has been recorded on a recording medium while being illuminated by light output from the LEDs, flickering is not visually detectable upon playback of the recording medium.

41. The illumination system of claim 39, wherein said power electronics provide a constant voltage level to said LEDs for a selected illumination intensity.

42. The illumination system of claim 39, wherein said power electronics provide a constant current to said LEDs for a selected illumination intensity.

43. The illumination system of claim 42, wherein said power electronics comprise a switched mode power regulator for providing the constant current level to said LEDs.

44. The illumination system of claim 43, further comprising a current sensor for providing feedback information used in maintaining the output current to said LEDs at a stable level for a selected illumination intensity.

45. The illumination system of claim 39, wherein said power electronics are configured to receive electrical power from a self-contained battery unit, said self-contained battery unit comprising a housing enclosing a battery and being releasably attachable to an external portion of said frame.

46. The illumination system of claim 45, wherein said power electronics are further configured to receive power from an external power source.

47. The illumination system of claim 46, wherein said self-contained battery unit is rechargeable when the power electronics are coupled to said external power source.

48. The illumination system of claim 46, wherein the external power source comprises an AC power source, and wherein said power electronics comprise an AC-to-DC power converter.

49. The illumination system of claim 35, further comprising an integrated power source contained within or secured to said frame.

50. The illumination system of claim 49, wherein said integrated power source comprises a battery.

51. The illumination system of claim 35, wherein the illumination intensity of said semiconductor light elements is controlled by a digital command.

52. The illumination system of claim 51, further comprising an onboard digital processor for controlling the adjustment of an electrical current provided to said semiconductor light elements in response to said adjustable dimmer.

53. The illumination system of claim 35, wherein said adjustable dimmer is configured to allow manual selection of the illumination intensity of said semiconductor light elements, from among a plurality of illumination intensity levels, via a manually actuatable control knob, dial, switch, keypad, or set of digital buttons.

54. The illumination system of claim 34, wherein said detachable DC power source comprises a plug-in cable, and wherein said power receptor is adapted to receive said plug-in cable.

55. The illumination system of claim 34, wherein:

said detachable DC power source comprises a detachable battery unit;

said portable frame comprises one or more attachment members for physically engaging said detachable battery unit; and

said power receptor comprises an electrical receptor for making an electrical connection with a battery contained within said detachable battery unit.

56. A wide area, camera-mounted digitally controlled illumination system for lighting a subject for film or video, the illumination system comprising:

a portable frame having a mounting surface and adapted for temporary and rapidly detachable mounting to a movable camera apparatus whereby the portable frame follows the movements of the camera apparatus;

a plurality of semiconductor light elements disposed on the mounting surface of the portable frame so as to provide continuous wide-area illumination for the subject;

an onboard adjustable dimmer, said adjustable dimmer configured to allow manual selection of a desired continuous illumination level for said semiconductor light elements; and

an integrated digital processor responsive to said adjustable dimmer for controlling an electrical signal provided to said semiconductor light elements in response to the selected illumination level.

57. The illumination system of claim 56, wherein said semiconductor light elements are light emitting diodes (LEDs), and wherein said adjustable dimmer is configured to allow manual selection of the illumination level of said semiconductor light elements, from among a plurality of illumination levels, via a manually actuatable control knob, dial, switch, keypad, or set of digital buttons.