Liquid crystal projector

In a liquid crystal projector provided with a cooling fan,

• the liquid crystal projector comprising:
• a plurality of temperature sensors for detecting an internal temperature of the liquid crystal projector;
• and
• a fan control circuit for controlling a driving voltage for the cooling fan on a basis of a temperature detected by each of the temperature sensors,
• the fan control circuit comprising
• a circuit for calculating, on the basis of the temperature detected by each of the temperature sensors and a temperature range determined depending on a position where the temperature sensor is mounted, a ratio of the detected temperature to the temperature range for each temperature sensor, and
• a circuit for controlling a driving voltage for the cooling fan on a basis of a maximum ratio of the detected temperature to the temperature range which has been calculated for each of the temperature sensors.

In a liquid crystal projector provided with a cooling fan,

• the liquid crystal projector comprising:
• a plurality of temperature sensors for detecting the internal temperature of the liquid crystal projector;
• and
• a fan control circuit for controlling a driving voltage for the cooling fan on the basis of the temperature detected by each of the temperature sensors,
• the fan control circuit comprising
• means for calculating a ratio of the detected temperature to a temperature range for each temperature sensor based upon the following formula:
• Tx=(Td−TL)/(TH−TL)
• wherein Tx is the calculated ratio;
• Td is the detected temperature and TH and TL are an upper limit temperature and a lower limit temperature respectively of the temperature range, and
• means for controlling the driving voltage for the cooling fan on the basis on a maximum one of the ratios of the detected temperature to the temperature range which has been calculated for the temperature sensors.

In a liquid crystal projector provided with a cooling fan,

• the liquid crystal projector comprising:
• a plurality of temperature sensors for detecting the internal temperature of the liquid crystal projector;
• and
• a fan control circuit for controlling a driving voltage for the cooling fan on the basis of a temperature detected by each of the temperature sensors,
• the fan control circuit comprising
• a circuit for calculating a ratio of the detected temperature to a temperature range for each temperature sensor based upon the following formula:
• Tx=(Td−TL)/(TH−TL)
• wherein Tx is the calculated ratio;
• Td is the detected temperature and TH and TL are an upper limit temperature and a lower limit temperature respectively of the temperature range, and
• a circuit for controlling a driving voltage for the cooling fan on the basis of a maximum one of the ratios of the detected temperature to the temperature range which has been calculated for the temperature sensors.