Patent ID: 8876706

Claim:
An endoscopic apparatus that outputs illuminating light from a tip of an endoscope inserting module to a subject and detects a reflected light from the subject to obtain an image signal of the subject, the endoscopic apparatus comprising: a first light source that includes a first semiconductor light source having a relation between a light intensity of the first semiconductor light source and an amplitude value of a driving signal inputted to the first semiconductor light source, a part of the first relation being nonlinear; a second light source that includes a second semiconductor light source emitting second light having different main wavelength component from the first light source; a target light intensity setting module that sets a target light intensity for a sum of emitted light intensities from the first light source and the second light source; a light intensity ratio setting module that sets an emitted light intensity ratio between the first light source and the second light source; an information storing module that stores information representing relations between an amplitude value of imputed driving signal and the emitted light intensity for each of the first light source and the second light source; an amplitude value setting module that sets a first amplitude value of the driving signal to be supplied to the first light source and a second amplitude value of the driving signal to be supplied to the second light source based on the emitted light intensity ratio set by the light intensity ratio setting module, the information stored in the information storing module, and the target light intensity set by the target light intensity setting module; a driving signal generating module that generates a common driving signal common to the first light source and the second light source based on the target light intensity, generates a first driving signal for the first light source by changing the amplitude value of the common driving signal into the first amplitude value, and generates a second driving signal for the second light source by changing the amplitude value of the common driving signal into the second amplitude value; and a signal supplying module that controls the sum of the emitted light intensities to be the target light intensity by supplying the first driving signal to the first light source and supplying the second driving signal to the second light source, respectively.