Endoscope beam source apparatus and endoscope system

An endoscope beam source apparatus which is connected to an endoscope, the endoscope mounting a radiation optical system for radiating a beam onto a subject and an imaging optical system including an imaging device for imaging an image of the subject, the endoscope beam source apparatus comprising:

• a beam source that emits radiation beam to be supplied to the endoscope;
• and
• a beam source control unit that controls emission beam intensity of the beam source according to a beam quantity specified value input therein,
• wherein the beam source control unit specifies the emission beam intensity of the beam source corresponding to the beam quantity specified value based on at least three of control amounts,
• the control amounts include:
• a control amount corresponding to pulse number modulation control for changing lighting time of the beam source;
• a control amount corresponding to pulse width modulation control for changing a pulse width which indicates the lighting time or lighting-out time within a control cycle;
• a control amount corresponding to pulse amplitude modulation control for changing lighting intensity;
• and
• a control amount corresponding to pulse density modulation control for changing a lighting interval,
• the imaging device mounted on the endoscope to be connected to the endoscope beam source apparatus is specified to a imaging device to be controlled according to a global shutter system, and
• the beam source control unit specifies the emission beam intensity of the beam source based on a combination of the control amount corresponding to the pulse number modulation control, the control amount corresponding to the pulse width modulation control and the control amount corresponding to the pulse amplitude modulation control.