Patent ID: 8547424
Filing Date: 2013-10-01
Classification: A61B,G02B,G03B

Abstract:
1. An endoscope system including a light source apparatus and an endoscope having an illumination optical system and an objective optical system, comprising: an operation switch for switching between a normal light observation mode using normal light and a special light observation mode using special light; a filter for the special light observation mode which is insertable into and retractable from one of a light path of the light source apparatus, a light path of the illumination optical system of the endoscope, and a light path of the objective optical system of the endoscope, as a first light path, wherein when the special light observation mode is selected through operation of the operation switch, the filter is inserted into the first light path; an adjustable diaphragm provided in the objective optical system of the endoscope, the adjustable diaphragm being insertable into and retractable from the light path as the first light path and a second light path, of the objective optical system of the endoscope, the adjustable diagram closing the second light path in an insertion state; a diaphragm actuator causing the adjustable diaphragm to be insertable or retractable from the second light path to switch the second light path into a state where the diaphragm of the second light path is closed or open; a control circuit comprising a brightness level detecting circuit to measure brightness of a subject in a state where the special light observation mode is selected through the operation of the operation switch and a filter for the special light observation is inserted into the first light path, and detecting whether the brightness is equal to or larger than a predetermined level and an actuator driving circuit that controls the diaphragm actuator according to a signal outputted from the brightness level detecting circuit and causes the adjustable diaphragm to be inserted into or retractable from the second light path; and a switch circuit for switching between driving and non-driving of the control circuit based on the operation switch and driving the control circuit when the special light observation mode is selected through the operation of the operation switch.