Color-adjusted camera light and method
DCFirst Claim
1. A portable video camera and illumination source system, comprising:
- a housing;
one or more light-emitting diodes (LEDs) attached to the housing;
a video camera imaging device attached to the housing;
a control circuit that selectively applies a plurality of pulses from a source of electric power to the one or more LEDs; and
a feedback signal coupled to the control circuit, wherein the control circuit changes a characteristic of each one of the plurality of pulses to control a light output characteristic of the LEDs based on the feedback signal.
4 Assignments
Litigations
3 Petitions
Accused Products
Abstract
Improved method and apparatus for hand-held portable illumination. A flashlight and corresponding method are described. The flashlight includes a housing, a plurality of LEDs, and an electrical circuit that selectively applies power from the DC voltage source to the LED units, wherein the flashlight is suitable for handheld portable operation by a user. In one embodiment, the first electrical circuit further includes a control circuit for maintaining a predetermined light output level of the LED units as a charge on a battery varies. In another embodiment, the control circuit maintains an average predetermined light output level of the LED units as the charge on the battery cell varies by changing a pulse width or frequency as the charge on the battery cell varies to maintain a given average light output. Another aspect provides an illumination source that includes a light-emitting diode (LED) housing including one or more LEDs, and a control circuit that selectively applies power from a source of electric power to the LEDs, the control circuit substantially maintaining a light output characteristic of the LEDs as a voltage of the voltage source varies over a range that would otherwise vary the light output characteristic. Still another aspect provides an illumination source including a light-emitting diode (LED) housing including one or more LEDs; and a control circuit that selectively applies power from a source of electric power to the LEDs, thus maintaining or controlling a light output color spectrum of the LEDs.
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Citations
40 Claims
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1. A portable video camera and illumination source system, comprising:
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a housing;
one or more light-emitting diodes (LEDs) attached to the housing;
a video camera imaging device attached to the housing;
a control circuit that selectively applies a plurality of pulses from a source of electric power to the one or more LEDs; and
a feedback signal coupled to the control circuit, wherein the control circuit changes a characteristic of each one of the plurality of pulses to control a light output characteristic of the LEDs based on the feedback signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 13, 14, 15, 16, 17, 18)
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11. A method for illuminating a scene and obtaining a video image comprising:
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controlling one or more light output pulses, directed towards the scene, of one or more light-emitting diodes (LEDs);
obtaining a video image of the scene; and
generating feedback, wherein the controlling changes a characteristic of the light output pulses of the LEDs based on the feedback.
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19. An illumination source comprising:
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a housing;
one or more light-emitting diodes (LEDs) attached to the housing;
a control circuit operatively coupled to supply electrical pulses to the one or more LEDs that adjusts a height of the pulses to control a color spectrum of the LED output light and adjusts an LED on-time proportion to control an amount of the output light. - View Dependent Claims (20, 21, 22, 23)
a video camera imaging device attached to the housing;
wherein the control circuit adjusts pulse width in order to control the LED on-time proportion.
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21. The illumination source of claim 19, further comprising:
a video camera imaging device attached to the housing, wherein the control circuit adjusts a pulse frequency in order to control the LED on-time proportion.
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22. The illumination source of claim 19, wherein the control circuit adjusts a pulse width in order to control the LED on-time proportion.
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23. The illumination source of claim 19, wherein the control circuit adjusts a pulse frequency in order to control the LED on-time proportion.
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24. An illumination source comprising:
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a housing;
one or more light-emitting diodes (LEDs) attached to the housing;
a control circuit operatively coupled to supply electrical pulses to the one or more LEDs that, corresponding to a change in a height of the pulses to the one or more LEDs, adjusts an LED on-time proportion to control an amount of output light. - View Dependent Claims (25, 26, 27, 28)
a video camera imaging device attached to the housing, wherein the control circuit adjusts a pulse width in order to control the LED on-time proportion.
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28. The illumination source of claim 24, further comprising:
a video camera imaging device attached to the housing, wherein the control circuit adjusts a pulse frequency in order to control the LED on-time proportion.
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29. An illumination source system, comprising:
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a housing;
one or more light-emitting diodes (LEDs) attached to the housing; and
a control circuit that selectively applies a plurality of pulses from a source of electric power to the one or more LEDs;
wherein the control circuit has a feedback signal input, wherein the control circuit changes a characteristic of each one of the plurality of pulses to control a light output characteristic of the LEDs based on the feedback signal. - View Dependent Claims (30, 31, 32, 33, 34)
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35. A method for illuminating a scene comprising:
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controlling one or more light output pulses, directed towards the scene, of one or more light-emitting diodes (LEDs);
obtaining a video image of the scene; and
generating feedback, wherein the controlling maintains a characteristic of the illumination on the scene by varying the pulses of the LEDs based on the feedback. - View Dependent Claims (36, 37, 38, 39, 40)
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Specification