OPTICAL DIAPHRAGM DEVICE, PROJECTOR, CORRECTION PARAMETER CALIBRATION DEVICE, AND CORRECTION PARAMETER CALIBRATION METHOD

摘要

PROBLEM TO BE SOLVED: To provide an optical diaphragm device capable of simplifying structure and achieving stable driving by moving a light shielding blade with high accuracy.

SOLUTION: The optical diaphragm device 5 is equipped with: the light shielding blade 52 which is freely movably configured and moved to change an aperture area capable of passing a luminous flux and adjust the light amount of the luminous flux; an electromagnetic actuator 58 having a permanent magnet 582 moved with respect to an electromagnetic coil 581 and connected to the light shielding blade 52, to move it, by an electromagnetic force by the mutual action between a current flowing into the electromagnetic coil 581 into which the current flows and the electromagnetic coil 581 generating a magnetic flux and the magnetic flux; a magnetic element outputting a predetermined voltage according to the strength of the magnetic field of the permanent magnet; and a position sensor 59 having an output characteristic correction section which obtains a predetermined correction parameter and corrects the output characteristics of the magnetic element, based on the correction parameter.

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