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US 10,855,891 B2Granted
Apparatus for controlling position of camera module
AssigneeSamsung Electro-Mechanics Co., Ltd.
InventorsWoo Young Choi, Sang Hoon Kim, Joo Yul Ko, Joo Hyoung Lee
Life of this patent
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Abstract
An apparatus to control a position of a camera module includes a magnetic member, a coil, a driver, a signal extractor, and a position detector. The magnetic member is disposed on a lens barrel of the camera module. The coil is disposed opposite to the magnetic member. The driver is configured to provide a position confirmation signal to the coil. The signal extractor is configured to extract a specific frequency component from a signal of the coil including the position confirmation signal and output a detection signal. The position detector is configured to provide a position signal corresponding to a position of the magnetic member based on the detection signal.
Claims16
An apparatus to control a position of a camera module, comprising:
- a magnetic member disposed on a lens barrel of the camera module;
- a coil disposed opposite to the magnetic member;
- a driver comprising an operational amplifier and a gain controller, and configured to generate an overlapped driving signal comprising a DC current driving signal and an AC current position confirmation signal, to which a gain from the gain controller has been applied, overlapped with each other, and to provide the overlapped driving signal to the coil, the position confirmation signal comprising a specific frequency component;
- a signal extractor configured to extract a detection signal, comprising the specific frequency component, from a signal of the coil;
- and
- a position detector configured to provide a position signal corresponding to a position of the magnetic member based on the detection signal.
3 more elements
An apparatus to control a position of a camera module, comprising:
- a magnetic member disposed on a lens barrel of the camera module;
- a coil disposed opposite to the magnetic member;
- a driver comprising an operational amplifier and a gain controller, and configured to generate an overlapped driving signal comprising a DC current driving signal and an AC current position confirmation signal, to which a gain from the gain controller has been applied, overlapped with each other, and to provide the overlapped driving signal to the coil, the position confirmation signal comprising a specific frequency component;
- a signal extractor configured to extract a detection signal, comprising the specific frequency component, from a signal of the coil;
- and
- a position detector configured to detect a magnitude of impedance of the coil using the detection signal and the position confirmation signal, and configured to provide a position signal corresponding to a position of the magnetic member based on a magnitude of the impedance of the coil.
3 more elements
An apparatus to control a position of a camera module, comprising:
- a magnetic member disposed on a lens barrel of the camera module;
- a coil disposed opposite to the magnetic member;
- a driver comprising an operational amplifier and a gain controller, and configured to generate an overlapped driving signal comprising a DC current driving signal and an AC current position confirmation signal, to which a gain from the gain controller has been applied, overlapped with each other, and to provide the overlapped driving signal to the coil, the position confirmation signal comprising a specific frequency component;
- a signal extractor configured to extract a detection signal, comprising the specific frequency component, from a signal of the coil;
- and
- a position detector configured to detect an angle of impedance of the coil using the detection signal and the position confirmation signal, and configured to provide a position signal corresponding to a position of the magnetic member, based on the angle of the impedance of the coil.
3 more elements
An apparatus for a camera module, comprising:
- a magnetic member disposed on a lens barrel of the camera module opposite to a coil configured to drive the magnetic member;
- a driver comprising an operational amplifier and a gain controller, and configured to generate an overlapped driving signal comprising a DC current driving signal and an AC current position confirmation signal, to which a gain from the gain controller has been applied, overlapped with each other, and to provide the overlapped driving signal to the coil, the position confirmation signal comprising a specific frequency component;
- a signal extractor configured to extract a detected voltage, comprising the specific frequency component, from a voltage across the coil and output a detection signal indicative thereof;
- and
- a position detector configured to calculate a magnitude and an angle of impedance of the coil using the detection signal and the position confirmation signal to detect a position of the lens barrel and output a position signal indicative thereof.
2 more elements
An apparatus for a camera module, comprising:
- a coil mounted on a side of a housing of a camera module, opposite to a magnetic member to provide a driving force to the magnetic member;
- a driver comprising an operational amplifier and a gain controller, and configured to generate and provide to the coil an overlapped driving signal comprising an AC current position confirmation signal, to which a gain from the gain controller has been applied, overlapped with a DC current driving signal;
- a signal extractor configured to extract a detected voltage from a voltage across the coil and output a detection signal indicative thereof, wherein the detection signal comprises a specific frequency component;
- and
- a position detector configured to detect impedance of the coil using the detection signal and the position confirmation signal and generate a position signal corresponding to a position of the magnetic member, based on the impedance of the coil.
2 more elements
Dependencies are inferred from the claim text.