Patent ID: 8624886

Claim:
A light emission driving device to drive multiple light sources sequentially on a time division basis comprising: a control circuit arranged to calculate a light emission amount control parameter to control a light emission amount for one of the light sources based on a detected light emission amount for a previous illumination of the same light source, a predetermined value for comparison to the detected light emission amount, and a light emission amount control parameter set for the previous illumination of the same light source, wherein the control circuit includes: a first register to store detected light emission amounts for respective previous illuminations of the light sources detected sequentially on a time division basis by a photo detector; a light emission amount setting circuit to provide predetermined values for each of the light sources; a second register to store light emission amount control parameters for respective previous illuminations of the light sources; an operation circuit to calculate light emission amount control parameters for each of the light sources based on an output from the first register, an output from the light emission amount setting circuit, and an output from the second register; and driving circuits to drive the light sources sequentially on a time division basis based on light emission amount control parameters for each of light sources calculated by the operation circuit.