Patent ID: 8421910

Claim:
A light source device comprising: a plurality of light emitting devices that are used as light sources of a photographing device and emit light of different wavelengths; a power supply device; and a light emission control device that separately supplies electric energy from the power supply device to the plurality of light emitting devices, controls ratios between light emission amounts from the plurality of light emitting devices of different wavelengths and all the light emission amounts from the plurality of light emitting devices, and turns on and off the plurality of light emitting devices, wherein the light emission control device comprises: a simultaneous light emission control device that makes the plurality of light emitting devices emit light simultaneously; a reflected light determining device that determines, during photographing of a subject, an amount of reflected light from the subject emitted from one of the plurality of light emitting devices of different wavelengths of which light emitting time is shortest among the plurality of light emitting devices; a first light emission stop control device that stops light emission of the light emitting device which light emitting time is shortest of the plurality of light emitting devices when the determined one of the amounts of reflected light from the subject determined by the reflected light determining device reaches a predetermined reference value, wherein said predetermined reference value is based on ratios between the light emission amounts from the plurality of light emitting devices of different wavelengths corresponding to a desired color of said plurality of light emitting devices, said ratios being controlled by the light emission control device; a measuring device that measures a light emitting time of the light emitting device controlled by the first light emission stop control device; a calculating device that calculates light emitting times of others of the light emitting devices according to the light emitting time measured by the measuring device and the ratios between the light emission amounts from the plurality of light emitting devices of different wavelengths; and a second light emission stop control device that stops light emission of the others of the light emitting devices according to the light emitting times calculated by the calculating device and subsequent to the first light emission stop control device stopping light emission of the light emitting device which light emitting time is shortest.