Endoscope system, processor, calibration apparatus, and endoscope

A processor capable of connecting to an endoscope including a position/angle sensor configured to detect a position or an angle of a movable member configured to adjust an image formation state of an image pickup optical system, and output a detection signal, and an amplifying circuit configured to amplify the detection signal and output the detection signal as an output signal, and capable of reading a memory configured to store output error sensitivity data based on a ratio of a change amount of an offset voltage included in a voltage of the output signal to a change amount of a wiring resistance value of a wiring for supplying an operation current to the position/angle sensor, and a first wiring resistance value of wiring for supplying the operation current, in a calibration apparatus that obtains the output error sensitivity data, the processor, comprising:

• a constant current circuit configured to supply the operation current to the position/angle sensor;
• a signal processing circuit configured to process the output signal from the amplifying circuit;
• and
• a processor memory configured to store a processor wiring resistance value of wiring for supplying the operation current in the processor, wherein
• the signal processing circuit reads the output error sensitivity data and the first wiring resistance value from the memory when the endoscope is connected, and corrects an error of the output signal, based on a value obtained by multiplying a difference between the first wiring resistance value and the processor wiring resistance value by the output error sensitivity data.

A calibration apparatus connectable to an endoscope including a position/angle sensor configured to detect a position or an angle of a movable member configured to adjust an image formation state of an image pickup optical system, and output a detection signal, an amplifying circuit configured to amplify the detection signal and output the detection signal as an output signal, and an endoscope memory, the calibration apparatus, comprising:

• a constant current circuit configured to supply an operation current to the position/angle sensor;
• a signal processing circuit configured to process the output signal from the amplifying circuit;
• a resistance switcher configured to switch a wiring of a first wiring resistance value for supplying the operation current, and a second wiring that is for supplying the operation current, and is of a second wiring resistance value different from the first wiring resistance value, in the calibration apparatus;
• and
• a calibration memory configured to store the first wiring resistance value and the second wiring resistance value, wherein
• when the endoscope and the calibration apparatus are connected,
• the resistance switcher switches to the wiring of the first wiring resistance value, and the signal processing circuit acquires a first output signal from the amplifying circuit,
• the resistance switcher switches to the second wiring of the second wiring resistance value, and the signal processing circuit acquires a second output signal from the amplifying circuit,
• the signal processing circuit obtains output error sensitivity data, based on a ratio of a value obtained by subtracting the first output signal from the second output signal to a value obtained by subtracting the first wiring resistance value from the second wiring resistance value, and
• the signal processing circuit causes the endoscope memory to store the output error sensitivity data and the first wiring resistance value.

An endoscope connectable to a processor, comprising:

• an image pickup optical system configured to form a subject image;
• a movable member configured to adjust an image formation state of the image pickup optical system;
• a position/angle sensor configured to detect a position or an angle of the movable member, and output a detection signal;
• an amplifying circuit configured to amplify the detection signal and output the detection signal as an output signal;
• and
• an endoscope memory configured to store output error sensitivity data based on a ratio of a change amount of an offset voltage included in a voltage of the output signal to a change amount of a wiring resistance value of wiring for supplying an operation current to the position/angle sensor, and a first wiring resistance value of wiring for supplying the operation current in a calibration apparatus that obtains the output error sensitivity data, wherein
• when the endoscope and the processor are connected, the output error sensitivity data and the first wiring resistance value are transmitted to the processor from the endoscope memory to cause the processor to correct an error of the output signal.