Samsung Electro-mechanics Co., Ltd.

Sang Hyun Min

Kwang Mook Lee

Tah Joon Park

Koon Shik Cho

Jae Hyung Lee

U Sang Lee

Yong Il Kwon

Je Hyeon Yu

Hyung Jin Choi

Ja Hwi Cho

Joo Hyun Do

Jung Hyun Kim

Jin A Kim

Ho Kwon Yoon

Sung Man Pang

Youn Joong Lee

Hyun Suk Lee

Ji Buem Chun

Bo Il Seo

Jung Tae Kim

Shin Woo Kang

Jung Su Han

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

A controller of a camera iris is provided. The controller includes a signal processing circuit that generates a detected position value corresponding to a current position of the iris, based on first and second sensing signals respectively received from first and second position sensors that detects an aperture position of the iris; a control circuit, that sets a section between the first aperture position and the second aperture position to a plurality of control sections, and if a command to change the aperture of the iris is made, performing a corresponding control operation for each of the plurality of control sections to control a movement operation of the iris, based on the detected position value; and a driving circuit that generates a driving current, and provide the generates driving current to a coil to drive the iris under control of the controller.

Control circuit and camera iris driving device

An actuator of a camera module includes a detected portion disposed on a lens barrel, and a position detector including a first sensing coil and a second sensing coil, disposed to face the detected portion, and a reference coil disposed outside of a region facing the detected portion, wherein the position detector detects a position of the detected portion in accordance with calculation results of inductances of the first sensing coil and the second sensing coil, and removes noise components by applying inductance of the reference coil to the calculation results of inductances of the first sensing coil and the second sensing coil.

Camera module, actuator, and portable electronic device

An actuator includes an oscillating unit including two or more oscillation circuits each configured to output an oscillation signal including a frequency, which is changed in response to movement of a detection target, a frequency down-converting unit configured to down-convert frequencies of two or more oscillation signals respectively output from the two or more oscillation circuits, and a determining unit configured to calculate a position of the detection target in response to two or more down-converted oscillation signals output from the frequency down-converting unit.

Actuator for a 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

An actuator including a detection target disposed on a surface of a lens barrel, and a position detecting unit including two or more sensing coils and configured to detect a displacement of the detection target in a first direction perpendicular to an optical axis, wherein when the detection target moves in a second direction perpendicular to the optical axis, an area of overlap between each of the two or more sensing coils and the detection target is maintained constant.

Actuator and camera module including same

A wireless power transmitter includes a sampling controller setting different retrieval sampling points of time for each section, among candidate sampling points of time, in each section of a carrier frequency signal; and a sampling unit configured to sample points of the carrier frequency signal at the different retrieval sampling points of time. The sampling controller compares values sampled by the sampling unit with each other, and determines a determined sampling point based on a comparison result.

Wireless power transmitter and method for controlling sampling in wireless power transmitter

A wireless power transmitter includes a converter configured to output an alternating current (AC) voltage in response to a transmission control signal; a power transmitter including a power transmitting coil and configured to vary an impedance in response to a resonance control signal, and to receive the AC voltage to wirelessly transmit power; and a controller configured to determine whether a wireless power receiver is present while varying the transmission control signal and the resonance control signal.

Wireless power transmitter and method for wirelessly transmitting power

Provided is a low-power ZigBee device provided with a sleeping mode and an active mode including a power supplying unit for supplying a power; a Medium Access Control (MAC) processing unit for receiving a wake-up packet and for controlling a modem unit and an Radio Frequency (RF) unit; and a Central Processing Unit (CPU) for receiving and processing a data packet, wherein the MAC processing unit makes the power supplying unit apply a power to the CPU based on a result of checking an identification (ID) of the wake-up packet.

Low power zigbee device and low power wake-up method

There is provided a receiver with a sigma-delta structure, the receiver including: a low noise amplifier amplifying a received signal according to a detection signal; a mixer converting an RF signal of the low noise amplifier into an IF signal; a sigma-delta A/D converter converting the IF signal from the mixerinto a digital signal; a 1 bit detector determining whether a voltage of the output signal of the mixer is greater than that of a predetermined reference voltage and outputting the detection signal including a result of the determination; and a demodulator obtaining an FFT result with respect to the signal from the sigma-delta A/D converter and adding or subtracting a predetermined gain value to or from the FFT result to calculate received signal strength indication (RSSI).

Receiver with sigma-delta structure

A direct sequence spread spectrum (DSSS) transceiver including a DSSS transmitter and a DSSS receiver, wherein the DSSS transmitter includes: an integral code mapping unit mapping source bit data in one of 2(N is a natural number) of predetermined symbols by N bits and mapping the symbol in one of integral code words that are obtained by previously integrating each of 2of bi-orthogonal code words; and a radio frequency (RF) transmitting unit transmitting the integral code words mapped by the integral code mapping unit over an RF carrier wave, and the DSSS receiver includes: an RF receiving unit removing an RF carrier wave from an RF signal from the RF transmitting unit and converting an analog signal obtained by removing the RF carrier wave from the RF signal into a digital signal; a differential circuit unit differentiating and converting the digital signal from the RF receiving unit into bi-orthogonal code words; and a symbol detection unit detecting a symbol corresponding to a maximum value of correlation values between bi-orthogonal code word from the differential circuit unit and a plurality of predetermined reference code words.

Direct sequence spread spectrum transceiver

A timing estimator of an OQPSK demodulator is provided. In the timing estimator, an A/D converter converts an analog reception signal into a digital reception signal. A differential circuit section delays the digital reception signal from the A/D converter by a preset time and obtains a phase difference between a conjugate complex number signal of the delayed digital reception signal and the digital reception signal to offset a frequency error contained in the digital reception signal. A correlation operation section performs a correlation operation between a reference symbol differentiated in the same way as a differentiation of the differential circuit section and the reception signal to obtain each correlation value. A coherent detector detects a coherent point on the basis of the correlation value from the correlation operation section.

Timing estimator in OQPSK demodulator

A demodulator and a demodulating method for a WPAN are provided. In the demodulator for estimating a demodulation value of a received signal by correlating a PN code sequence of PN code having a periodic relationship for each code with a sample of the received signal, an IF processor unit separates the received signal to select only an imaginary part of the received signal, and digitalizes the selected imaginary part of the received signal. A differentiator unit delays the received signal outputted from the IF processor unit by preset delay time, and multiplies the delayed received signal by a current received signal to output a plurality of differentiated received signals. A conjugate unit sequentially stores samples of the imaginary parts of the differentiated received signals, and calculates correlation values by correcting the stored samples with PN coded sequences. A timing estimator unit receives the differentiated received signals and controls an operating timing of the conjugate unit. A demodulation value estimator unit stores the correlation values outputted from the conjugate unit and estimates the symbol of the PN code sequence corresponding to a maximum correlation value as the demodulation value of the received signal.

Demodulator and demodulating method for WPAN

The present invention relates to a multiple differential demodulator using a weighting value. The multiple differential demodulator according to the present invention includes a weighting value generator for integrating a real part and an imaginary part of a value acquired by multiplying one of a plurality of differentiated reception signals by a conjugated value of a differentiated PN code signal corresponding to a preset symbol, and determining the greater of the integrated real and integrated imaginary parts to apply a predetermined weighting value to the greater value, where the PN code signal is differentiated in the same fashion as the differentiated reception signals.

Multiple differential demodulator using weighting value

The present invention relates to a method of estimating symbol synchronization for an Offset Quadrature Phase Shift Keying (OQPSK) demodulator applicable to a Zigbee receiver. More particularly, the invention relates to a method of recovering symbol synchronization of an OQPSK demodulator in which a reference correlation value is reset using a correlation value of a reception signal when detecting symbol synchronization in the OQPSK demodulator, preventing errors in detecting symbol synchronization due to noise, thereby increasing the accuracy in symbol synchronization.

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Suwon-si, South Korea

Sang Hyun Min