Electronic flash, electronic camera and light emitting head
First Claim
Patent Images
1. An electronic flash of a camera, comprising:
- R, G and B light emitting diodes that are used as an electronic flash light source;
a power supply device; and
a light emission control device that supplies electric energy separately to each of the R, G and B light emitting diodes from the power supply device, and controls ratios between light emission amounts of R, G and B that are emitted from the R, G and B light emitting diodes and a total light emission amount of R, G and B, wherein the light emission control device performs control to turn on and off the R, G and B light emitting diodes, respectively, with duty ratios corresponding to the ratios between light emission amounts of R, G and B.
2 Assignments
0 Petitions
Accused Products
Abstract
R, G and B LEDs are used as a light source of an electronic flash. Electric energy is supplied to a capacitor to the LEDs. A system controller controls light emitting amounts of the LEDs so that a color temperature of the electronic flash light becomes a color temperature that has been manually set with a color temperature setting switch or a color temperature of a light source determined by color temperature sensors.
65 Citations
12 Claims
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1. An electronic flash of a camera, comprising:
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R, G and B light emitting diodes that are used as an electronic flash light source;
a power supply device; and
a light emission control device that supplies electric energy separately to each of the R, G and B light emitting diodes from the power supply device, and controls ratios between light emission amounts of R, G and B that are emitted from the R, G and B light emitting diodes and a total light emission amount of R, G and B, wherein the light emission control device performs control to turn on and off the R, G and B light emitting diodes, respectively, with duty ratios corresponding to the ratios between light emission amounts of R, G and B. - View Dependent Claims (2)
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3. An electronic flash of a camera, comprising:
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R, G and B light emitting diodes that are used as an electronic flash light source;
a power supply device;
a recording device that records at least one light emission color of electronic flash light that is emitted from the R, G and B light emitting diodes;
a designating device that designates reading of a light emission color that is recorded in the recording device; and
a light emission control device that supplies electric energy separately to each of the R, G and B light emitting diodes from the power supply device, and controls ratios between light emission amounts of R, G and B that are emitted from the R, G and B light emitting diodes and a total light emission amount of R, G and B, wherein when a desired light emission color is read from the recording device by the designating device, the light emission control device controls the ratios between light emission amounts of R, G and B so as to generate the light emission color that is read. - View Dependent Claims (4)
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5. An electronic camera that stores color image signals of a subject image on recording medium captured with a taking lens and an imaging device, the electronic camera comprising:
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R, G and B light emitting diodes that are used as an electronic flash light source;
a power supply device;
a determining device that determines ratios between R, G and B of the color image signals based on color image signals of a subject image captured with the imaging device before a shooting; and
a light emission control device that supplies electric energy separately to each of the R, G and B light emitting diodes from the power supply device, and controls ratios between light emission amounts of R, G and B that are emitted from the R, G and B light emitting diodes and a total light emission amount of R, G and B, wherein the light emission control device controls the ratios between light emission amounts of R, G and B in correspondence to the ratios between R, G and B that are determined by the determining device. - View Dependent Claims (6)
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7. An electronic flash of a camera, comprising:
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light emitting diodes that are used as an electronic flash light source;
a power supply device; and
a light emission control device that supplies electric energy to the light emitting diodes from the power supply device, and controls light emission amounts that are emitted from the light emitting diodes;
wherein the light emission control device includes;
a switching device for supplying electric energy from the power supply device to the light emitting diodes;
an electric current determining device that determines an electric current flowing to the light emitting diodes; and
a pulse width controlling device that performs control to turn the switching device on and off by use of a pulse signal that is controlled by a duty ratio so that an electric current that is determined by the electric current determining device becomes a desired constant current. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification