Abstract: A projector includes an exterior housing taking in outside air via a filter, , a suction fan having an intake opening taking in the outside air, a front chamber communicating with the filter and the intake opening, a pressure sensor placed in the front chamber, and a control unit drive-controlling the suction fan. The control unit executes first measurement processing of activating the suction fan and measuring pressure of the front chamber at a rotation number at the activation by the pressure sensor, second measurement processing of setting a rotation number of the suction fan to a rotation number lower than the rotation number at the activation and measuring the pressure of the front chamber by the pressure sensor, and determination processing of determining clogging of the filter based on a difference between a pressure value of the first measurement processing and a pressure value of the second measurement processing.

Abstract: An optical path shifting device includes: a holding frame holding a rectangular glass plate; a support part supporting the holding frame in a swingable state; an actuator causing the holding frame to swing; a magnetic sensor detecting a position of the holding frame; and a thermistor detecting a temperature of the magnetic sensor. A drive signal processing circuit includes: an amplifier amplifying a reference signal to generate a drive signal and supplying the drive signal to the actuator; and a signal processing unit inputting the reference signal and an amplifier gain to the amplifier. The signal processing unit performs gain adjustment processing to correct an amplitude value found from an output from the magnetic sensor, based on an output from the thermistor, and to adjust the amplifier gain, based on a corrected value.

Abstract: An optical path shifting device includes: a holding frame holding a rectangular glass plate; a support part supporting the holding frame in a swingable state; an actuator causing the holding frame to swing; a magnetic sensor detecting a position of the holding frame; and a thermistor detecting a temperature of the magnetic sensor. A drive signal processing circuit includes: an amplifier amplifying a reference signal to generate a drive signal and supplying the drive signal to the actuator; and a signal processing unit inputting the reference signal and an amplifier gain to the amplifier. The signal processing unit performs gain adjustment processing to correct an amplitude value found from an output from the magnetic sensor, based on an output from the thermistor, and to adjust the amplifier gain, based on a corrected value.

Abstract: A projector includes light source, plurality of light modulation devices, light combining device integrated with the plurality of light modulation devices, projection optical device, posture adjustment device that adjusts posture of the light combining device, and control device that controls operation of the posture adjustment device, the posture adjustment device includes lead screw that changes posture of the light combining device, driver that rotates lead screw, shaft member to which rotation of lead screw is transmitted, potentiometer that detects amount of rotation of the shaft member, and photosensor that may be shielded by light shielding portion provided in the shaft member, and the control device includes abnormality determination unit that determines whether or not abnormality has occurred based on detection result by the potentiometer, and return operation unit that, if occurrence of abnormality is determined, returns the light combining device to original position based on detection result by th

Abstract: A projector includes light source, plurality of light modulation devices, light combining device integrated with the plurality of light modulation devices, projection optical device, posture adjustment device that adjusts posture of the light combining device, and control device that controls operation of the posture adjustment device, the posture adjustment device includes lead screw that changes posture of the light combining device, driver that rotates lead screw, shaft member to which rotation of lead screw is transmitted, potentiometer that detects amount of rotation of the shaft member, and photosensor that may be shielded by light shielding portion provided in the shaft member, and the control device includes abnormality determination unit that determines whether or not abnormality has occurred based on detection result by the potentiometer, and return operation unit that, if occurrence of abnormality is determined, returns the light combining device to original position based on detection result by th

Abstract: A projector and a method of controlling the projector that may give information on suitability of a light source. A projector includes light sources, light modulators (liquid crystal panels) that modulate lights output from the light sources, a projection optical device that projects the lights modulated by the light modulators, a determination unit that determines whether or not a light source unadapted to a mounting position of the projector is attached, and an informing unit (display control unit) that, if a determination that the light source unadapted to the mounting position of the projector is attached is made by the determination unit, gives information in response to a determination result.

Abstract: A position detection device includes: a sensor that includes a light emission unit and a light reception unit receiving light emitted from the light emission unit; a driving unit; a gear (transmission gear) that is disposed at a position facing the sensor and is rotated by power from the driving unit; and a control unit that drives the driving unit based on an amount of light received by the light reception unit and detected by the sensor.

Abstract: A position detection device includes: a sensor that includes a light emission unit and a light reception unit receiving light emitted from the light emission unit; a driving unit; a gear (transmission gear) that is disposed at a position facing the sensor and is rotated by power from the driving unit; and a control unit that drives the driving unit based on an amount of light received by the light reception unit and detected by the sensor.

Abstract: A projector and a method of controlling the projector that may give information on suitability of a light source. A projector includes light sources, light modulators (liquid crystal panels) that modulate lights output from the light sources, a projection optical device that projects the lights modulated by the light modulators, a determination unit that determines whether or not a light source unadapted to a mounting position of the projector is attached, and an informing unit (display control unit) that, if a determination that the light source unadapted to the mounting position of the projector is attached is made by the determination unit, gives information in response to a determination result.

Abstract: A projector including a discharge tube as a light source includes a light source driver that supplies the discharge tube with electric power and an electric power control portion that controls the level of the electric power with which the light source driver supplies the discharge tube to perform a normal mode in which the light source driver supplies electric power of a predetermined electric power level and a power saving mode in which the light source driver supplies electric power of a power saving level lower than the predetermined electric power level. The power saving mode is a mode in which light emission from the discharge tube can be maintained.

Abstract: A projector including a discharge tube as a light source includes a light source driver that supplies the discharge tube with electric power and an electric power control portion that controls the level of the electric power with which the light source driver supplies the discharge tube to perform a normal mode in which the light source driver supplies electric power of a predetermined electric power level and a power saving mode in which the light source driver supplies electric power of a power saving level lower than the predetermined electric power level. The power saving mode is a mode in which light emission from the discharge tube can be maintained.