Lens module and electronic device having the same
AssigneeHon Hai Precision Industry Co., Ltd.
InventorsShi-Kai Huang, Hsieh-Tung Chung
Life of this patent
Estimating the term…
Abstract
A lens module for autofocus of a camera in passive mode includes a lens barrel containing a first lens, a second lens, a pressure sensor, an image sensor, and a processor. In the passive autofocus mode, the first lens is located at a first end of the lens barrel and moves within the lens barrel when a distance to a target object changes. The pressure sensor between the first and the second lenses senses both pulling and pushing pressures which the first lens applies. The image sensor is adjacent to an end of the lens barrel and is behind the first and second lenses. The processor can apply formulas to calculate a distance between the target object and the lens module.
Claims16
A lens module comprising:
- a lens barrel having a first end and an opposite second end;
- a first lens mounted inside the lens barrel and located at the first end;
- wherein in the passive autofocus mode, the first lens is configured to move within the lens barrel when a distance between a target object and the lens module is changed, thereby the lens module focuses on the target object and performs a passive autofocus function;
- a second lens mounted inside the lens barrel;
- a pressure sensor mounted inside the lens barrel and positioned between the first lens and the second lens;
- wherein the pressure sensor is configured to sense a pressure applied by the first lens when the first lens moves;
- an image sensor mounted inside the lens barrel and located at the second end, the second lens positioned between the first lens and the image sensor;
- and
- a processor mounted inside the lens barrel, and the processor configured to calculate a moving distance of the first lens according to a pressure value of the sensed pressure, calculate a moving distance of the target object according to the moving distance of the first lens, and calculate a distance between the target object and the lens module according to the moving distance of the target object.
An electronic device comprising:
- a lens module for use in a passive autofocus mode comprising:
- a lens barrel having a first end and an opposite second end;
- a first lens mounted inside the lens barrel and located at the first end;
- wherein in the passive autofocus mode, the first lens is configured to move within the lens barrel when a distance between a target object and the lens module is changed, thereby the lens module focuses on the target object and performs a passive autofocus function;
- a second lens mounted inside the lens barrel;
- a pressure sensor mounted inside the lens barrel and positioned between the first lens and the second lens;
- wherein the pressure sensor is configured to sense a pressure applied by the first lens when the first lens moves;
- an image sensor mounted inside the lens barrel and located at the second end, the second lens positioned between the first lens and the image sensor;
- and
- a processor mounted inside the lens barrel, and the processor configured to calculate a moving distance of the first lens according to a pressure value of the sensed pressure, calculate a moving distance of the target object according to the moving distance of the first lens, and calculate a distance between the target object and the lens module according to the moving distance of the target object.
Dependencies are inferred from the claim text.