Lens moving apparatus
AssigneeLG Innotek Co., Ltd.
InventorsSANG OK PARK, BYUNG WOOK SON, KYOUNG HO YOO, JUN TAEK LEE
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Abstract
Disclosed is a lens moving apparatus. The lens moving apparatus includes a moving unit having at least one lens installed therein and moving by electromagnetic interaction between magnets and coils, elastic members configured to support the moving unit, and position sensors configured to sense change of electromagnetic force emitted from the magnets according to movement of the moving unit and to output an output signal based on a result of sensing, and a primary resonant frequency of frequency response characteristics according to gain of a ratio of the output signal of the position sensors to an input signal applied to the coils is 30 Hz to 200 Hz.
Claims20
A lens moving apparatus comprising:
- a housing;
- a bobbin disposed in the housing;
- a first coil disposed on the bobbin;
- a magnet disposed on the housing and facing the first coil;
- an elastic member coupled with the bobbin and the housing;
- a sensing magnet disposed on the bobbin;
- and
- a position sensor disposed opposite to the sensing magnet and configured to output an output signal,
- wherein an input signal is applied to the first coil to move the bobbin,
- wherein a primary resonant frequency of frequency response characteristics is 30 Hz to 200 Hz, and
- wherein the frequency response characteristics are related to a gain of a ratio of the output signal of the position sensor to the input signal applied to the first coil.
A lens moving apparatus comprising:
- a housing;
- a bobbin disposed in the housing;
- a first coil disposed on the bobbin;
- a magnet disposed on the housing;
- an elastic member coupled with the bobbin and the housing;
- a sensing magnet disposed on the bobbin;
- a first position sensor disposed opposite to the sensing magnet and configured to output a first output signal related to the sensing magnet;
- a second coil disposed opposite to the magnet;
- and
- a second position sensor configured to output a second output signal related to the magnet,
- wherein a first input signal is applied to the first coil to move the bobbin in a direction along an optical axis, and a second input signal is applied to the second coil to move the housing in a direction perpendicular to the optical axis,
- wherein a primary resonant frequency of first frequency response characteristics has a frequency domain of 30 Hz to 200 Hz, and the first frequency response characteristics are related to a gain of a ratio of the second output signal of the second position sensor to the second input signal applied to the second coil,
- wherein a resonant frequency of the first frequency response characteristics has a frequency domain exceeding 200 Hz.
Dependencies are inferred from the claim text.