Abstract: A camera module actuator includes: a magnet disposed on a lens barrel; a driving coil disposed opposite to the magnet; and a driving device including a comparer that calculates an error value by comparing a target position of the lens barrel with a current position of the lens barrel, a controller IC that generates a control signal by applying control gains to the error value, and a driving circuit that generates a driving signal in response to the control signal. The controller IC determines the control gains based on a friction coefficient between a guide groove guiding movement of the lens barrel and a ball bearing contacting the guide groove. The controller IC provides a detection signal having a gradually increasing level to the driving coil, and determines the friction coefficient based on a level of the detection signal at a point in time of movement of the lens barrel.

Abstract: An actuator for a camera includes a housing having an inner space, a base and a carrier, disposed in the housing in one direction, a first drive unit generating driving forces in a first direction perpendicular to the one direction and a second direction perpendicular to both the one direction and the first direction, and including a plurality of magnets and a plurality of coils, and a second drive unit generating a driving force in the one direction, and including a magnet and a coil, wherein an optical member is disposed on the carrier, wherein the carrier and the base are configured to be moved together in the first direction and the second direction, and wherein the carrier is configured to be moved relative to the base in the one direction.

Abstract: A camera module includes a housing having an internal space, and a first lens module and a second lens module disposed in the internal space and each configured to be movable in an optical axis direction, wherein a first shaft and a first ball member are disposed between the first lens module and the housing, wherein a second shaft and a second ball member are disposed between the second lens module and the housing, and wherein, when moving in the optical axis direction, rolling friction occurs on one of both sides of each lens module, and sliding friction occurs on the other of both sides.

Abstract: A position detecting device for detecting a position of a magnet configured to move over a first target point and a second target point in steps includes a first hall device configured to generate a first hall voltage, a second hall device configured to generate a second hall voltage, a subtractor configured to generate a subtraction voltage based on a difference between the first hall voltage and the second hall voltage, an adder configured to generate an addition voltage based on a combination of the first hall voltage and the second hall voltage, a divider configured to calculate a ratio of the subtraction voltage to the addition voltage, and a subtraction voltage changing unit configured to maintain the subtraction voltage at the first target point and the second target point and in a transition section between the first target point and the second target point to be constant.

Abstract: A camera module actuator includes: a magnet disposed on a lens barrel; a driving coil disposed opposite to the magnet; and a driving device including a comparer that calculates an error value by comparing a target position of the lens barrel with a current position of the lens barrel, a controller IC that generates a control signal by applying control gains to the error value, and a driving circuit that generates a driving signal in response to the control signal. The controller IC determines the control gains based on a friction coefficient between a guide groove guiding movement of the lens barrel and a ball bearing contacting the guide groove. The controller IC provides a detection signal having a gradually increasing level to the driving coil, and determines the friction coefficient based on a level of the detection signal at a point in time of movement of the lens barrel.

Abstract: A position detecting device includes a first hall device and a second hall device; a subtractor to subtract a second hall voltage generated by the second hall device from a first hall voltage generated by the first hall device to generate a subtraction voltage; an adder to add the first hall voltage to the second hall voltage to generate an addition voltage; and a divider to calculate a ratio of the addition voltage to the subtraction voltage in accordance with a charging time of a capacitor using the addition voltage and a discharging time of the capacitor using the subtraction voltage.

Abstract: A position detecting device for detecting a position of a magnet configured to move over a first target point and a second target point in steps includes a first hall device configured to generate a first hall voltage, a second hall device configured to generate a second hall voltage, a subtractor configured to generate a subtraction voltage based on a difference between the first hall voltage and the second hall voltage, an adder configured to generate an addition voltage based on a combination of the first hall voltage and the second hall voltage, a divider configured to calculate a ratio of the subtraction voltage to the addition voltage, and a subtraction voltage changing unit configured to maintain the subtraction voltage at the first target point and the second target point and in a transition section between the first target point and the second target point to be constant.

Abstract: A circuit with load driver detection includes a reference voltage generation circuit configured to generate a reference voltage based on a reference current, a voltage selection circuit configured to select one of a first detection voltage based on a first driving current through a load and a second detection voltage based on a second driving current flowing through the load, and a detection circuit configured to generate a detection signal, the detection circuit being configured to compare a detection voltage selected by the voltage selection circuit with the reference voltage, wherein the reference voltage is set by the reference voltage generation circuit in response to the load.

Abstract: A dual-slope analog-to-digital converter includes a switching circuit, an integrating circuit, a dual comparison circuit, and a control circuit. The integrating circuit is configured to perform a charging operation having a first slope, based on a magnitude of an input voltage selected by the switching circuit, and a discharging operation having a second slope, based on a magnitude of the reference voltage selected by the switching circuit, and output a first voltage. The dual comparison circuit is configured to output a first comparison signal by comparing the first voltage with a first reference voltage and output a second comparison signal by comparing a second reference voltage, higher than the first reference voltage, with the first voltage. The control circuit is configured to output a digital value corresponding to the magnitude of the input voltage, based on a first count value and a second count value.

Abstract: A controller includes an amplification ratio control unit, an amplification unit, a digital conversion unit, and a driving current control unit. The amplification ratio control unit is configured to generate an amplification ratio signal based on an ambient temperature of a laser diode. The amplification unit configured to amplify, based on the amplification ratio signal, a detection current from a photodiode configured to detect light output from the laser diode, and output the detection current as a voltage signal. The amplification ratio signal controls an amplification ratio of the amplification unit. The digital conversion unit is configured to convert the voltage signal into a digital signal. The driving current control unit is configured to control a driving current of a driver configured to drive the laser diode based on the digital signal.

Abstract: A reset signal generator may include a voltage divider dividing a voltage level of a driving voltage, a reference voltage generator generating a reference voltage by performing a switching operation on the driving voltage depending on a voltage level of the divided driving voltage from the voltage divider, and a comparator comparing the voltage level of the divided driving voltage and the reference voltage to output a reset signal depending on the comparison result. The integrated circuit includes the reset signal generator and a controller resetting a control operation depending on the reset signal.