Patent ID: 7656371
Filing Date: 2010-02-02
Classification: H05B

Abstract:
1. A light emitting apparatus comprising: at least two light emitting elements with different chromaticities; and a light emitting element controller that controls light emitted from the light emitting apparatus so as to be a desired chromaticity of the emitted light which is mixed by at least two lights with different chromaticities, wherein the light emitting element controller controls drive currents of the light emitting elements based on a predetermined function of light emitting element temperature variation and drive current, the predetermined function represents the drive current as a substantially linear function of the temperature, the predetermined function is set based on an actual measurement of the chromaticity of mixed light in order to adjust the chromaticity of mixed light to be a predetermined constant value, and the light emitting element controller sets one drive current value of one light emitting element with one chromaticity as constant, and controls another drive current value of another light emitting element with another chromaticity adjustably based on the linear function of temperature variation.