Patent ID: 9066677
Filing Date: 2015-06-30
Classification: A61B

Abstract:
1. An illumination unit comprising: a plurality of semiconductor light sources that emit lights with different spectra from each other in accordance with inputted driving signals; a target light quantity setting unit that sets a target light quantity for a total outgoing light quantity which is obtained by summing up quantities of the lights emitted from the semiconductor light sources; a light quantity ratio setting unit that sets an outgoing light quantity ratio among the semiconductor light sources; an amplitude value setting unit that sets amplitude values of individual driving signals for the semiconductor light sources to different values, respectively, based on the set outgoing light quantity ratio; and a driving signal generating unit that obtains a common signal of a common driving pulse corresponding to the target light quantity, modulates the common signal in common pulse modulation control, and changes an amplitude value of the modulated common signal to the amplitude values set by the amplitude value setting unit for the semiconductor light sources to generate individual driving signals for the respective semiconductor light sources while keeping the set amplitude values, wherein the common pulse modulation control is selected from at least one of the pulse number modulation, pulse density modulation, and pulse width modulation.