Automatic focusing system, method, and vehicular camera device therefor
AssigneeTriple Win Technology(Shenzhen) Co. Ltd.
InventorsYu-An Cho, Nai-Cyun Ke, Che-Ming Liu
Life of this patent
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Abstract
A camera device in or on a vehicle includes a lens module, a driving module having at least one shape memory alloy wire, and a converting module. The camera device is connected to a control device and receives control signals from the control device. The control signal drives the lens module to move for purpose of automatic focusing by applying heat to energize or de-energize the length or shape of the shape memory alloy wire.
Claims12
An automatic focusing system comprising:
- a control device;
- and
- a camera device, comprising:
- a lens module configured to be assembled inside a vehicle;
- a driving structure, comprising at least one shape memory alloy wire (SMA wire);
- and
- a converting module configured to connect to a control device and to receive a control signal from the control device, wherein the control signal controls the SMA wire to become energized or de-energized thereby changing the focus of the lens module;
- wherein the control device drives the lens module to focus according to the formula AF=(a*(X{circumflex over ( )}b))+c, wherein AF represents a focusing distance of the lens module, X represents a moving distance of the lens module, X{circumflex over ( )}b represents the bth power of X, and a, b, and c are parameters of the lens module;
- and wherein, during focusing, the moving distance X is preset, the parameters of a, b, and c are constants, the focusing distance AF is calculated according to the formula AF=(a*(X{circumflex over ( )}b))+c, the lens module is driven to focus at the focusing distance AF.
A automatic focusing method for an automatic focusing system, the automatic focusing system comprising a camera device having a lens module and a control device, the method comprising:
- capturing an image of a preset position by the camera device;
- determining whether the captured image is distinct;
- and
- driving the lens module to focus according to a formula AF=(a*(X{circumflex over ( )}b))+c if the captured image is determined not distinct, wherein AF represents a focusing distance of the lens module, X represents a moving distance of the lens module, X{circumflex over ( )}b represents the bth power of X, and a, b, and c are parameters of the lens module;
- and wherein, during focusing, the moving distance X is preset, the product parameters of a, b, and c are constants.
Dependencies are inferred from the claim text.