Projector and control method

A control method executed by a control device of a projector,

• the projector including
• a light source,
• a plurality of light modulation devices that respectively modulate lights output from the light source,
• a light combining device integrated with the plurality of light modulation devices and combining the lights entering from the respective plurality of light modulation devices,
• a projection optical device that projects the light combined in the light combining device,
• a posture adjustment device that adjusts a posture of the light combining device, and
• a control device that controls operation of the posture adjustment device,
• the posture adjustment device including
• a lead screw that changes the posture of the light combining device,
• a driver that rotates the lead screw,
• a shaft member to which a rotation of the lead screw is transmitted,
• a potentiometer that detects an amount of rotation of the shaft member, and
• a photosensor including a light receiving portion that may be shielded according to a rotation of the shaft member by a light shielding portion provided in the shaft member, and
• the control method comprising:
• determining whether or not an abnormality has occurred in the posture adjustment device based on a detection result by the potentiometer;
• and
• if a determination that the abnormality has occurred is made, driving the driver and returning the light combining device to an original position based on a detection result by the photosensor.

A control method executed by a control device of a projector,

• the projector including
• a light source,
• a plurality of light modulation devices that respectively modulate lights output from the light source,
• a light combining device integrated with the plurality of light modulation devices and combining the lights entering from the respective plurality of light modulation devices,
• a projection optical device that projects the light combined in the light combining device,
• a posture adjustment device that adjusts a posture of the light combining device, and
• a control device that controls operation of the posture adjustment device,
• the posture adjustment device including
• a lead screw that changes the posture of the light combining device,
• a driver that rotates the lead screw,
• a shaft member to which a rotation of the lead screw is transmitted,
• a potentiometer that detects an amount of rotation of the shaft member, and
• a photosensor having a light receiving portion that may be shielded according to a rotation of the shaft member by a light shielding portion provided in the shaft member, and
• the control method comprising returning the light combining device to an original position by rotating the shaft member by a prescribed amount as a prescribed amount of rotation from a change position where a shielded state in which the light receiving portion is shielded by the light shielding portion of the shaft member and a non-shielded state in which the light receiving portion is not shielded are switched based on a detection result by the photosensor.