Abstract: An embodiment of a light source device according to the invention includes: a light source unit configured to emit light; a first optical element on which the light emitted from the light source unit is incident; a first drive unit configured to rotate the first optical element; and a control unit configured to control the light source unit and the first drive unit. The control unit is configured to continue rotating the first optical element during a first period until a first predetermined time passes after the light source unit is turned off.

Abstract: An embodiment of a light source device according to the invention includes: a light source unit configured to emit light; a first optical element on which the light emitted from the light source unit is incident; a first drive unit configured to rotate the first optical element; and a control unit configured to control the light source unit and the first drive unit. The control unit is configured to continue rotating the first optical element during a first period until a first predetermined time passes after the light source unit is turned off.

Abstract: A discharge lamp lighting device capable of preventing magnetic saturation of an inductor connected with an output of an inverter. An inverter 12 comprises a first set of switching elements 32, 33 for switching an output voltage of the inverter 12 to a positive polarity and a second set of switching elements 31, 34 for switching the output voltage thereof to a negative polarity. At the start-up of a lamp 20, each of the switching elements 31 to 34 is allowed to perform switching operations in such a pattern that after turning on and off the first set of the switching elements 32, 33 more than once, the second set of switching elements 31, 34 are allowed to turn or and off more than once. Accordingly, energy stored in the inductor 37 is discharged during a temporary off-period, thus permitting the inductor 37 to be prevented from being magnetically saturated.

Abstract: A discharge lamp lighting device capable of preventing magnetic saturation of an inductor connected with an output of an inverter. An inverter 12 comprises a first set of switching elements 32, 33 for switching an output voltage of the inverter 12 to a positive polarity and a second set of switching elements 31, 34 for switching the output voltage thereof to a negative polarity. At the start-up of a lamp 20, each of the switching elements 31 to 34 is allowed to perform switching operations in such a pattern that after turning on and off the first set of the switching elements 32, 33 more than once, the second set of switching elements 31, 34 are allowed to turn or and off more than once. Accordingly, energy stored in the inductor 37 is discharged during a temporary off-period, thus permitting the inductor 37 to be prevented from being magnetically saturated.

Abstract: A discharge lamp control device includes: a discharge lamp driver section which drives a lamp; and a discharge lamp drive control section which performs constant current control so that a discharge lamp current that flows between electrodes of the lamp becomes constant when a discharge lamp voltage applied between the electrodes of the lamp is lower than a first voltage after the lamp has been lighted. The discharge lamp drive control section performs constant power control so that an amount of power supplied to the lamp becomes constant when the lamp voltage is equal to or higher than the first voltage and is equal to or lower than a predetermined voltage which is higher than the first voltage after the discharge lamp has been lighted; and the discharge lamp drive control section reduces the amount of power supplied to the lamp according to an increase in the discharge lamp voltage when the discharge lamp voltage is higher than the predetermined voltage after the lamp has been lighted.

Abstract: A discharge lamp control device includes: a discharge lamp driver section which drives a lamp; and a discharge lamp drive control section which performs constant current control so that a discharge lamp current that flows between electrodes of the lamp becomes constant when a discharge lamp voltage applied between the electrodes of the lamp is lower than a first voltage, and performs constant power control so that an amount of power supplied to the lamp becomes constant when the discharge lamp voltage is equal to or higher than the first voltage after the lamp has been lighted. The discharge lamp drive control section includes a discharge lamp drive frequency control section which causes the drive frequency when the discharge lamp voltage is lower than a second voltage which is equal to or lower than the first voltage to be lower than the drive frequency when the discharge lamp voltage is higher than the second voltage.

Abstract: A projector includes: a power supply device; an image projection device having a light source device; a sound processing device adapted to process a sound signal from an external microphone; and a control device adapted to control the power supply device, wherein the control device can selectively set either one of a first operation mode in which the light source device and the sound processing device are made to be supplied with electrical power and a second operation mode in which the sound processing device is made to be supplied with the electrical power while halting supplying the electrical power to the light source device, and the control device controls the electrical power supply by the power supply device to the light source device and the sound processing device based on the operation mode set.

Abstract: A discharge lamp control device includes: a discharge lamp driver section which drives a lamp; and a discharge lamp drive control section which performs constant current control so that a discharge lamp current that flows between electrodes of the lamp becomes constant when a discharge lamp voltage applied between the electrodes of the lamp is lower than a first voltage, and performs constant power control so that an amount of power supplied to the lamp becomes constant when the discharge lamp voltage is equal to or higher than the first voltage after the lamp has been lighted. The discharge lamp drive control section includes a discharge lamp drive frequency control section which causes the drive frequency when the discharge lamp voltage is lower than a second voltage which is equal to or lower than the first voltage to be lower than the drive frequency when the discharge lamp voltage is higher than the second voltage.

Abstract: A discharge lamp control device includes: a discharge lamp driver section which drives a lamp; and a discharge lamp drive control section which performs constant current control so that a discharge lamp current that flows between electrodes of the lamp becomes constant when a discharge lamp voltage applied between the electrodes of the lamp is lower than a first voltage after the lamp has been lighted. The discharge lamp drive control section performs constant power control so that an amount of power supplied to the lamp becomes constant when the lamp voltage is equal to or higher Man the first voltage and is equal to or lower than a predetermined voltage which is higher than the first voltage after the discharge lamp has been lighted; and the discharge lamp drive control section reduces the amount of power supplied to the lamp according to an increase in the discharge lamp voltage when the discharge lamp voltage is higher than the predetermined voltage after the lamp has been lighted.

Abstract: A transfer robot 2 for holding the peripheral edge of a wafer 1 and transferring the wafer 1, a turning-over alignment section 7 for turning over the wafer 1 and centering the wafer 1, and a transfer robot cleaning section 6 for cleaning holding portions 2a of the transfer robot 2 are provided. Besides, a wafer cleaning section 5 for cleaning the wafer 1 is provided and in this wafer cleaning section 5, a spinner 22 for chucking the wafer 1 and a nozzle 20 through which a cleaning liquid is jetted to this wafer 1. To this nozzle 20, a tank 11 for pure water for supplying pure water, a tank 12 for functional water for supplying a functional water, a tank 13 for chemical liquid for supplying a chemical liquid, and a cleaning liquid mixing portion 14 for storing these various kinds of cleaning liquids and mixing them are connected through supply lines.

Abstract: The new and distinct cultivar relates to a russet type Japanese pear tree that has a strong resistance to black spot disease and has substantially the same excellent qualities as the Japanese pear cultivar `Shinsui`. The new pear tree bears a yellowish brown fruit, is highly sweet, medium in acidity, and has a rich taste that is suitable for dessert use.

Abstract: The new and distinct cultivar relates to a Japanese pear tree that has a strong resistance to black spot disease and has substantially the same excellent qualities of `Osanijisseki` as a Japanese pear cultivar. This pear tree is self-compatible and bears a yellowish green fruit, is moderately sweet and acidic, and has a good taste that is suitable for a dessert pear.