Abstract: Various embodiments of the present technology may comprise a method and apparatus for autofocus. In various embodiments, the methods and apparatus may decrease a settling time of a lens by increasing the target position gradually, varying the gain of a PID controller, and adding a kick pulse to a position signal.

Abstract: Various embodiments of the present technology may comprise a method and apparatus for autofocus. In various embodiments, the methods and apparatus may decrease a settling time of a lens by increasing the target position gradually, varying the gain of a PID controller, and adding a kick pulse to a position signal.

Abstract: Various embodiments of the present technology may comprise a method and apparatus for autofocus. In various embodiments, the methods and apparatus may decrease a settling time of a lens by increasing the target position gradually, varying the gain of a PID controller, and adding a kick pulse to a position signal.

Abstract: Various embodiments of the present technology may comprise a method and apparatus for autofocus. In various embodiments, the methods and apparatus may decrease a settling time of a lens by increasing the target position gradually, varying the gain of a PID controller, and adding a kick pulse to a position signal.

Abstract: A first terminal supplies the bias voltage to a high-potential-side input terminal of a hall element. A second terminal supplies the ground potential to a low-potential-side input terminal of the hall element. A P-channel type transistor is configured such that the source terminal is connected to the power supply potential and the drain terminal is connected to the first terminal. An operational amplifier differentially amplifies the voltage between a predetermined set voltage and the voltage at the first terminal so as to control the gate voltage of the P-channel type transistor.

Abstract: A focus control circuit is installed in an image pickup apparatus including a lens, a driver element for adjusting the position of the lens, and a position detecting element for detecting the position of the lens. A feedback equalizer included in the focus control circuit generates a drive signal used to adjust the position of the lens to a target position, based on a difference between the position of the lens identified by the output signal of the position detecting element and the target position of the lens set externally, and controls the driver element.

Abstract: A focus control circuit is installed in an image pickup apparatus including a lens, a driver element for adjusting the position of the lens, and a position detecting element for detecting the position of the lens. An equalizer included in the focus control circuit generates a drive signal used to adjust the position of the lens to a position to be set, based on a difference between the position of the lens identified by the position detecting element and the set position. When an instruction to vary a target position of the lens is received externally, a position setting unit included in the focus control circuit sets sequentially a plurality of positions in a range covering a new target position and a previous target position, to the equalizer before the new target position is reached from the previous target position.

Abstract: A first terminal supplies the bias voltage to a high-potential-side input terminal of a hall element. A second terminal supplies the ground potential to a low-potential-side input terminal of the hall element. A P-channel type transistor is configured such that the source terminal is connected to the power supply potential and the drain terminal is connected to the first terminal. An operational amplifier differentially amplifies the voltage between a predetermined set voltage and the voltage at the first terminal so as to control the gate voltage of the P-channel type transistor.

Abstract: An equalizer generates a control signal for adjusting, based on a difference between a target value for the state of an object and an actual measured value thereof, the state of the object to match the target value. A PWM modulation unit generates a PWM signal corresponding to the control signal generated by the equalizer. An H-bridge drive unit generates a drive current for driving a drive element that changes the state of the object in accordance with the PWM signal generated by the PWM modulation unit. A slew-rate control unit changes the current driving capability of the H-bridge drive unit in accordance with the control signal.

Abstract: A focus control circuit is installed in an image pickup apparatus including a lens, a driver element for adjusting the position of the lens, and a position detecting element for detecting the position of the lens. An equalizer included in the focus control circuit generates a drive signal used to adjust the position of the lens to a position to be set, based on a difference between the position of the lens identified by the position detecting element and the set position. When an instruction to vary a target position of the lens is received externally, a position setting unit included in the focus control circuit sets sequentially a plurality of positions in a range covering a new target position and a previous target position, to the equalizer before the new target position is reached from the previous target position.

Abstract: A focus control circuit is installed in an image pickup apparatus including a lens, a driver element for adjusting the position of the lens, and a position detecting element for detecting the position of the lens. A feedback equalizer included in the focus control circuit generates a drive signal used to adjust the position of the lens to a target position, based on a difference between the position of the lens identified by the output signal of the position detecting element and the target position of the lens set externally, and controls the driver element.

Abstract: A motor control circuit for reducing current consumption. A stepping motor control circuit includes an A/B phase current setting signal generation circuit for generating an A/B phase current signal setting signals provided to a stepping motor driver to supply a stepping motor with a predetermined amount of drive current. Based on a switch signal, first and second switches selectively output an A/B phase current setting signal and an A/B phase reference signal, for reducing the drive current of the stepping motor more than the A/B phase current setting signal. An intermittent drive control circuit generates the switch signal. The stepping motor control circuit provides the motor driver with the A/B phase reference signal in accordance with the switch signal.

Abstract: A motor control circuit for reducing current consumption. A stepping motor control circuit includes an A/B phase current setting signal generation circuit for generating an A/B phase current signal setting signals provided to a stepping motor driver to supply a stepping motor with a predetermined amount of drive current. Based on a switch signal, first and second switches selectively output an A/B phase current setting signal and an A/B phase reference signal, for reducing the drive current of the stepping motor more than the A/B phase current setting signal. An intermittent drive control circuit generates the switch signal. The stepping motor control circuit provides the motor driver with the A/B phase reference signal in accordance with the switch signal.

Abstract: A control circuit provided in an optical disk apparatus which apparatus has a motor to move an optical pickup unit for performing record/playback control of an optical disk in a radial direction of the optical disk, sets a plurality of concentric annular zones on the optical disk, and performs record/playback control, for each zone, of the optical disk. The control circuit comprises a pulse period detector for detecting pulse periods of a periodic pulse control signal which drives the motor; and a zone determination section that determines the zone which the optical pickup unit is facing on the basis of the number of pulse period detection times detected by the pulse period detector.

Abstract: A slice level control circuit for obtaining optimal filter characteristics depending on optical disc data reading speed or optical disc condition, while achieving superior stability and response with respect to slice level. The control circuit cuts DC components in analog input signals to generate C-cut RF signals having adjusted DC levels. A comparator compares two C-cut RF signals to generate a binary RF signal for driving a charge pump circuit. An analog lowpass filter eliminates high-frequency components from the output signal of the charge pump circuit. An A/D converter circuit converts the cutoff output signal of the analog lowpass filter into a digital value signal according to sampling periods. A digital filter filters the digital value signal. A D/A converter converts the filtered digital value signal into an analog voltage signal. The analog voltage signal controls the slice level of the binary circuit.