Abstract: The image projection apparatus includes a temperature detector that detects a temperature inside of the apparatus, and a controller that performs a protection operation when the temperature detected by the temperature detector is higher than a predetermined temperature. The controller measures an elapsed time from when a power of the apparatus is turned on, and changes the predetermined temperature in accordance with the elapsed time. This apparatus can avoid mistaken activation or inactivation of a protection function at the time of re-lighting of the light source due to the influence of the residual heat after the light source is turned off.

Abstract: The image projection apparatus includes an exhaust air outlet through which an exhaust air flows out from an inside of the apparatus to an outside thereof, an air inlet through which an external air flows in from the outside of the apparatus to the inside thereof, a temperature detector which detects a temperature of the external air flowing into the inside of the apparatus through the air inlet, and a controller which performs a protection operation when one of a predetermined temperature corresponding to a temperature of the exhaust air and a predetermined temperature change caused by flowing in of the exhaust air through the air inlet is detected by the temperature detector. The apparatus enables quick detection of a state in which the exhaust air outlet is blocked to perform the protection operation.

Abstract: The image projection apparatus includes a heat generating member disposed inside the apparatus, an exhaust fan exhausting an air that has cooled the heat generating member to the outside of the apparatus, and a duct guiding the air from the heat generating member to the exhaust fan. An outflow opening of the duct is oriented in a direction different from an inflow direction of the air into an inflow opening thereof. At least one air guiding wall is provided inside the duct, which forms plural airflow paths within a cross section extending along the inflow direction and an outflow direction of the air. The apparatus is capable of reducing unevenness in flow rate of the air when guiding the air toward the exhaust fan using a bent-type duct.

Abstract: A light source apparatus is disclosed which allows effective cooling of an arc tube even with a small amount of wind. The light source apparatus has a light emitter and a reflector which reflects light from the light emitter and causes the reflected light to emerge. The light source apparatus also has a wind-guiding member which has a flow inlet and a flow outlet of cooling wind and has a wall portion at a position opposite to the flow inlet, the wall portion guiding the cooling wind toward the light emitter in the reflector. The light source apparatus which has a reflector to which an arc tube is fixed via a connecting member, and has a first flow path on which cooling wind from a fan flows to cool an area of the arc tube closer to the connecting member, and a second flow path on which cooling wind from the fan flows to cool an area of the arc tube closer to a light emitting portion. The second flow path is formed separately from the first flow path.

Abstract: An image projection apparatus is disclosed which is capable of reducing noise when airflows from plural flow paths are taken in into a fan and exhausted therefrom. The apparatus comprises a first flow path through which a first airflow for cooling a light source passes, a second flow path through which a second airflow for cooling constituent parts other than the light source passes, a fan which exhausts air introduced from the first and second flow paths to the outside of the apparatus, a third flow path which introduces a third airflow to an exhaust area between the light source and the fan in the first flow path, and a light-shielding member which is provided in the exhaust area and shields the light from the light source.

Abstract: A servo motor with a built-in drive circuit in which a sensor circuit portion, a drive control circuit portion, and a motor drive circuit are collectively provided on two boards, thereby achieving simplification and a reduction in the size of the circuit configuration. In the servo motor with the built-in drive circuit, the sensor circuit portion and the drive control circuit portion are formed on a sensor circuit board, and the motor drive circuit is formed on a motor drive board, thereby achieving a reduction in size.

Abstract: A servo motor with a built-in drive circuit is provided in which, when power is off, positional data including multiple-rotation counting values is stored in a nonvolatile memory to thereby eliminate battery back-up, and in which the CPU of a drive control circuit portion is in charge of the multiple-rotation counting itself to thereby eliminate the circuit for multiple-rotation counting. Due to a reduction in the number of lines involved and an elimination of battery back-up, a reduction in size is achieved. The servo motor with a built-in drive circuit includes an absolute encoder for detecting rotation of a servo motor portion and an electromagnetic mechanical brake, in which, when the power is off, the positional data at that time is stored in a nonvolatile memory.

Abstract: A light source apparatus is disclosed which allows effective cooling of an arc tube even with a small amount of wind. The light source apparatus has a light emitter and a reflector which reflects light from the light emitter and causes the reflected light to emerge. The light source apparatus also has a wind-guiding member which has a flow inlet and a flow outlet of cooling wind and has a wall portion at a position opposite to the flow inlet, the wall portion guiding the cooling wind toward the light emitter in the reflector. The light source apparatus which has a reflector to which an arc tube is fixed via a connecting member, and has a first flow path on which cooling wind from a fan flows to cool an area of the arc tube closer to the connecting member, and a second flow path on which cooling wind from the fan flows to cool an area of the arc tube closer to a light emitting portion. The second flow path is formed separately from the first flow path.

Abstract: Disclosed is a method of driving a servo motor with a built-in drive circuit in which a common rectifying circuit is provided on a distribution board to which a plurality of the servo motors with built-in drive circuits are connected, to thereby achieve a reduction in size of each servo motor. In this method, there is used a common distribution board for distributing power to be supplied to a plurality of servo motors with built-in drive circuits and for distributing a communication line, an external communication signal and external input power are supplied through the distribution board.

Abstract: The present invention provides a motor with a brake in which, after an initial stage, a voltage applied to the brake is reduced to thereby restrain heat generation in the brake. In the motor with a brake, after signal drive, a voltage of a drive signal supplied to an electromagnetic drive portion of the brake is reduced, whereby heat generation in the brake during motor rotation is restrained, which makes it possible to increase a load to be applied to the motor.

Abstract: Disclosed is a servo motor with a built-in drive circuit according to the present invention in which, when power is off, positional data including multiple-rotation counting values is stored in a nonvolatile memory to thereby eliminate battery back-up, and in which the CPU of a drive control circuit portion is in charge of the multiple-rotation counting itself to thereby eliminate the circuit for multiple-rotation counting. Due to a reduction in the number of lines involved and an elimination of battery back-up, a reduction in size is achieved. A servo motor with a built-in drive circuit according to the present invention includes an absolute encoder (30) for detecting rotation of a servo motor portion (100) and an electromagnetic mechanical brake (20), in which, when the power is off, the positional data (30A) at that time is stored in a nonvolatile memory.

Abstract: Disclosed is a method of driving a servo motor with a built-in drive circuit in which a common rectifying circuit is provided on a distribution board to which a plurality of the servo motors with built-in drive circuits are connected, to thereby achieve a reduction in size of each servo motor. In this method, there is used a common distribution board for distributing power to be supplied to a plurality of servo motors with built-in drive circuits and for distributing a communication line, an external communication signal and external input power are supplied through the distribution board.

Abstract: Disclosed is a servo motor with a built-in drive circuit in which a sensor circuit portion, a drive control circuit portion, and a motor drive circuit are collectively provided on two boards, thereby achieving simplification and a reduction in size of circuit configuration. In the servo motor with the built-in drive circuit according to the present invention, the sensor circuit portion and the drive control circuit portion are formed on a sensor circuit board, and the motor drive circuit is formed on a motor drive board, thereby achieving a reduction in size.

Abstract: A coating method characterized in that a coating liquid including a pigment and a binder, and having a concentration of between 50 and 70% by weight and a viscosity of between 700 and 4000 cps, is deaerated in an environment having a degree of vacuum of a saturated vapor pressure or less and under a condition of applying shear to the coating liquid, and a printing base paper is coated with the deaerated coating liquid having the curtain-like shape to produce a coated paper for printing and having a superior white paper brightness, smoothness, uniform coating quantity, and printing suitability.

Abstract: Disclosed is a water-soluble coolant for formation of drawn and ironed cans, which comprises an aqueous solution containing 0.1 to 20% by weight of a phosphorus-containing compound obtained by esterifying an epoxidation product of at least one higher unsaturated fatty acid or its ester with phosphoric acid.