Samsung Electro-mechanics Co., Ltd.

University of Seoul Industry Cooperation Foundation

Je Hyeon Yu

Sung Man Pang

Youn Joong Lee

Ja Hwi Cho

Jin A Kim

Sang Hyun Cha

Yun Joong Lee

Chang Seok Lee

Chan Woo Park

Deuk Hee Park

Ji Hwan Kim

Yun Tae Lee

Sang Hyun Min

Koon Shik Cho

Jong Tae Hwang

Ji Buem Chun

Chang Wook Lee

Young Bok Yoon

Soo Hyun Moon

Ho Kwon Yoon

Joong Ho Choi

Kwang Mook Lee

Myeung Su Kim

Jung Eun Youm

Hye Jin Lee

Hyeon Seon Yu

A tiltless OIS circuit includes a first signal processing unit generating a first direction-position detection signal and a tilt detection signal based on a first direction-first sensing signal and a first direction-second sensing signal, a control unit generating a first direction position control signal, a tilt control signal, and a second direction position control signal, based on the first direction-position detection signal, the tilt detection signal, and a second direction sensing signal, respectively, a second signal processing unit generating a first direction-first position control signal and a first direction-second position control signal based on the first direction position control signal and the tilt control signal, and a driving unit generating a first direction-first driving signal, a first direction-second driving signal, and a second direction driving signal, based on the first direction-first position control signal, the first direction-second position control signal, and the second direction position control signal, respectively.

Tiltless optical image stabilization (OIS) circuit and OIS device

A position detecting device includes a detector circuit detecting a detection signal including information on a position of a magnet from a coil disposed in a housing and opposing the magnet, which is disposed in a lens barrel; and a control circuit converting the detection signal into a count value, determining a conversion formula based on the count value and a velocity of change in the count value, and detecting a position value using the determined conversion formula.

Device and method for detecting position in driving-sensing integrated camera module

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.

Position detecting device of aperture module

An actuator including two or more detection targets disposed on a surface and another surface of a lens barrel, respectively, an oscillating unit including a first oscillation circuit unit including two or more oscillation circuits disposed to face the surface and a second oscillation circuit unit including two or more oscillation circuits disposed to face the other surface to output oscillation signals, and a determining unit to calculate a position of the lens barrel from the oscillation signals output from the oscillating unit. A frequency range of an oscillation signal output from any one of the two or more oscillation circuits of the first oscillation circuit unit is different from that of an oscillation signal output from any one of the two or more oscillation circuits of the second oscillation circuit unit.

Actuator of camera module

An apparatus controlling a position of a camera module includes an operating coil disposed on a housing of the camera module to face a magnetic member disposed on a lens barrel of the camera module, a driving circuit providing a driving current to the operating coil, a capacitor circuit having a capacitor value to form a resonance circuit together with the operating coil to resonate at a resonance frequency varied depending on an inductance value of the operating coil; a resonance maintaining circuit maintaining a level of a resonance signal generated by the operating coil and the capacitor circuit, a resonance frequency detecting circuit detecting a resonance frequency signal from the resonance signal generated by the operating coil and the capacitor circuit, and a control circuit configured to control the driving circuit in response to the resonance frequency signal from the resonance frequency detecting circuit.

Apparatus and method controlling position of camera module with a single coil

A camera module includes a lens barrel configured to be movable; a detection target disposed on one side of the lens barrel; an integrated coil and a sensing coil facing the detection target and disposed in a direction perpendicular to a direction of movement of the lens barrel; a driver configured to apply a driving signal to the integrated coil; and a position detector configured to detect a position of the lens barrel according to an inductance of the integrated coil and an inductance of the sensing coil, wherein a width of the integrated coil in the direction perpendicular to the direction of movement of the lens barrel and a width of the sensing coil in the direction perpendicular to the direction of movement of the lens barrel change in the direction of movement of the lens barrel.

Camera module

An actuator for a camera module includes two or more detectable elements, the detectable elements are respectively disposed on a first and second surface of a lens barrel, an oscillating element including a first oscillation circuit unit that includes two or more oscillation circuits facing the first surface of the lens barrel, and a second oscillation circuit unit that includes two or more oscillation circuits facing the second surface of the lens barrel, and a determining device that calculates a position of the lens barrel in response to oscillation signals output from the oscillating element. The determining device is configured to calculate the position of the lens barrel based on determined frequencies of oscillation signals of the first oscillation circuit unit and the second oscillation circuit unit.

Camera module with actuator and lens module position detection

A camera module includes a lens barrel, a driving coil disposed to face a target detection unit prepared on one side of the lens barrel, a driving device configured to provide a driving signal to the driving coil, and a position calculating unit including a first capacitor, configured to provide a ground for an alternating current (AC) signal to the driving coil, a second capacitor, connected to the driving coil to constitute oscillation circuit together with the driving coil, and a position calculating circuit configured to calculate a position of the lens barrel from a frequency of the oscillation circuit.

Camera module and portable electronic device

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.

Controller of optical transmitter

A gate driving circuit may include: a bias unit receiving an input signal having preset high and low signal levels, including a first N-MOSFET turned on in the case in which the input signal has the high level and a first P-MOSFET turned on in the case in which the input signal has the low level, and supplying bias powers by the turning-on of the first N-MOSFET and the first P-MOSFET; and an amplifying unit including a second N-MOSFET turned on by receiving the bias power supplied from the first N-MOSFET in the case in which the input signal has the high level and a second P-MOSFET turned on by receiving the bias power supplied from the first P-MOSFET turned on in the case in which the input signal has the low level and providing a gate signal depending on the turning-on of the second N-MOSFET and the second P-MOSFET.

Gate driving circuit including constant current sources, and switching apparatus and power supply apparatus having the same

Disclosed herein is a voltage control circuit for a dimmer and a dimming method. In accordance with an embodiment, the dimming method using a voltage control circuit for a dimmer includes the steps of determining whether a current voltage value input to a constant dimming range maintainer is equal to a preset minimum or maximum voltage value or exists between the minimum and maximum voltage values, and determining whether the current voltage value is greater than the maximum voltage value when the current voltage value isn't equal to the minimum or maximum voltage value or doesn't exist between the minimum and maximum voltage values. The method further includes the steps of updating the minimum voltage value to the current voltage value when the current voltage value isn't greater than the maximum voltage value, and updating the maximum voltage value to the current voltage value when the current voltage value is greater than the maximum voltage value.

Voltage control circuit for dimmer and dimming method using the same

A light emitting diode (LED) driving apparatus includes a power converting unit and a driving controlling unit. The power converting unit switches input power to supply driving power to at least one LED. In one example, the driving controlling unit controls the supplying of the power based on a switching period of the power converting unit and a demagnetization time in the switching period. In another example, the driving controlling unit controls the supplying of the power based on the input power, a switching period of the power converting unit, and a drain voltage by the switching.

Light emitting diode driving apparatus

There are provided a light emitting diode (LED) driving apparatus and an LED lighting apparatus, in which a common detection resistor detecting a current flowing in each LED is used. According to exemplary embodiments of the present disclosure, manufacturing costs and a circuit area may be reduced by commonly using a common detection resistor detecting a current flowing in each of the LEDs.

Light emitting diode driving apparatus and light emitting diode lighting apparatus

There is provided an apparatus for driving a light emitting diode (LED), performing switching-operation with respect to a pair of LED groups by a phase difference of 180 degrees. The apparatus includes a switching unit that alternately switches a first LED unit and a second LED unit of at least one pair of LED units emitting light by receiving rectified power, in accordance with a predetermined phase difference, a current limiting unit that limits a current flowing in the at least one pair of LED units through the switching of the switching unit, and a driving control unit that controls switching driving of the switching unit in accordance with a voltage level of the rectified power.

Apparatus for driving light emitting diode

There is provided a light emitting diode (LED) driving apparatus configured such that a waveform of current input to an LED follows a sine wave, the LED driving apparatus including, a switching unit switching an LED unit having a plurality of LEDs receiving rectified power and emitting light, a driving control unit controlling the switching of the switching unit according to a voltage level of the rectified power, a current limiting unit limiting current flowing in the LED unit, and an adjusting unit adjusting current limitation of the current limiting unit according to the voltage level of the rectified power.

Growing community of inventors

Suwon-si, South Korea

Je Hyeon Yu