Abstract: An image reading device includes a reading unit and a controller connected to the reading unit through a transmission path. The controller includes: a first clock generator which generates a first reference clock; a second clock generator which generates a second reference clock; a line synchronizer which generates a line synchronization signal based on the first reference clock; a clock transmitter which transmits the line synchronization signal and a unit clock based on the first reference clock to the reading unit; and a processor which execute a process based on the second reference clock and which is synchronized with the line synchronization signal. The reading unit includes a reading sensor which reads a document line by line based on the unit clock and the line synchronization signal.

Abstract: An image reading device includes a reading unit and a controller connected to the reading unit through a transmission path. The controller includes: a first clock generator which generates a first reference clock; a second clock generator which generates a second reference clock; a line synchronizer which generates a line synchronization signal based on the first reference clock; a clock transmitter which transmits the line synchronization signal and a unit clock based on the first reference clock to the reading unit; and a processor which execute a process based on the second reference clock and which is synchronized with the line synchronization signal. The reading unit includes a reading sensor which reads a document line by line based on the unit clock and the line synchronization signal.

Abstract: A motor drive device having a motor drive unit, a controller, and a rotational detector. The motor drive unit drives a brushless DC motor, the brushless DC motor has a rotor. The controller produces a motor driving signal to drive the brushless DC motor. The a rotational detector detects a rotational state of the brushless DC motor to produce a rotational state signal. The controller receives the rotational state signal from the rotational detector, determines a phase-switching timing to switch a phase of the brushless DC motor based on the rotational state signal, and transmits the phase-switching timing as the motor driving signal to the motor driver.

Abstract: An apparatus for controlling a rotational motion of a motor is disclosed which includes: a signal generator generating a rotational state signal indicative of a rotational state of the motor; and a controller producing a control signal for controlling the rotational motion of the motor, based on the rotational state signal generated by the signal generator, to thereby control the motor based on the produced control signal. The controller produces the control signal during a start up of the motor, such that the produced control signal is not affected by a noise component which is incorporated into the rotational state signal during the start up of the motor.

Abstract: An apparatus for controlling a rotational motion of a motor is disclosed which includes: a signal generator generating a rotational state signal indicative of a rotational state of the motor; and a controller producing a control signal for controlling the rotational motion of the motor, based on the rotational state signal generated by the signal generator, to thereby control the motor based on the produced control signal. The controller produces the control signal during a start up of the motor, such that the produced control signal is not affected by a noise component which is incorporated into the rotational state signal during the start up of the motor.

Abstract: An apparatus for controlling a rotational motion of a motor is disclosed which includes: a signal generator generating a rotational state signal indicative of a rotational state of the motor; and a controller producing a control signal for controlling the rotational motion of the motor, based on the rotational state signal generated by the signal generator, to thereby control the motor based on the produced control signal. The controller produces the control signal during a start up of the motor, such that the produced control signal is not affected by a noise component which is incorporated into the rotational state signal during the start up of the motor.

Abstract: A motor drive device having a motor drive unit, a controller, and a rotational detector. The motor drive unit drives a brushless DC motor, the brushless DC motor has a rotor. The controller produces a motor driving signal to drive the brushless DC motor. The a rotational detector detects a rotational state of the brushless DC motor to produce a rotational state signal. The controller receives the rotational state signal from the rotational detector, determines a phase-switching timing to switch a phase of the brushless DC motor based on the rotational state signal, and transmits the phase-switching timing as the motor driving signal to the motor driver.

Abstract: An apparatus for controlling a rotational motion of a motor is disclosed which includes: a signal generator generating a rotational state signal indicative of a rotational state of the motor; and a controller producing a control signal for controlling the rotational motion of the motor, based on the rotational state signal generated by the signal generator, to thereby control the motor based on the produced control signal. The controller produces the control signal during a start up of the motor, such that the produced control signal is not affected by a noise component which is incorporated into the rotational state signal during the start up of the motor.

Abstract: The invention particularly relates to a solenoid valve used in a control fluid, and one end of a center pole on the side opposite from a plunger is covered with theend face of a housing, and a communication passage is formed in the housing to communicate a through hole of the center pole with an opening formed on the housing on the side of the plunger. The communication passage has an end face groove and at least one side face groove on the end face and the side face of the housing. A volume of the side face groove is larger than a variation in volume of a space between the plunger and the center pole due to the movement of the plunger, and it is 2.5 times or more of the variation in volume of the space between the plunger and the center pole due to the movement of the plunger.

Abstract: An image recording apparatus which records an image of an original document on an image receiving sheet with the use of a photosensitive recording medium, the image receiving sheet having front and rear faces differing in reflection ratio. To detect error in sheet face orientation, a sheet face sensor unit is provided upstream of a pressure developing unit which discriminates a face of the image receiving sheet. The sensor unit includes a light emitting element for emitting light toward the face of the image receiving sheet and a light receiving element for receiving light emitted from the light emitting element and reflected on the face of the image receiving sheet.