Lens driving device
A lens drive device and lens technology, which is applied in the field of photography, can solve the problems of magnetic flux leakage and that the magnet 3 cannot be made thin, and achieve the effects of reduced magnetic flux leakage, high magnetic field utilization efficiency, and compact structure
Inactive Publication Date: 2012-12-05
JOHNSON ELECTRIC SHENZHEN
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Problems solved by technology
Like this, in above-mentioned prior art, magnet 3 cannot be made thinner in height direction.
The magnetic field of the traditional structure has magnetic flux leakage on the radial plane of the magnet,
Method used
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[0011] In order to make the technical problems to be solved, technical solutions and beneficial effects of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0012] see figure 2 and image 3 , a lens driving device provided by an embodiment of the present invention includes a fixed part and a moving part, the fixed part includes a base 10, an upper cover 30 and a magnet 50 fixed between the base 10 and the upper cover 30; The moving part includes a lens frame 70 for accommodating the lens, and a coil 90 fixedly sleeved on the lens frame 70 .
[0013] The base 10 and the upper cover 30 may respectively include radial extensions 10a, 30a, and cylindrical axial extensions 10b, 30b, and the lens holder 70 is telescopicall...
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The invention provides a lens driving device, which comprises a fixed part and a moving part, wherein the fixed part comprises a base and an upper cover, and the moving part comprises a lens bracket for accommodating a lens; the base and the upper cover comprise radial extending parts and axial extending parts respectively; the fixed part also comprises a magnet which is fixed between the radial extending parts of the base and the upper cover and is polarized along the optical axis direction of the lens; and the moving part also comprises a coil which is fixed on the lens bracket and is positioned between the axial extending parts of the base and the upper cover. In the lens driving device, because the magnet is polarized along the optical axis direction of the lens, the magnet can be made thinner along the optical axis direction of the lens for contributing to reducing the size of the lens driving device along the optical axis direction; and the N and S poles of the magnet are clung to the base and the upper cover respectively to reduce the magnetic leakage on a radial plane so that the utilization rate of a magnetic field is higher.
Description
technical field [0001] The invention belongs to the technical field of imaging, and in particular relates to a lens driving device. Background technique [0002] With the continuous development of science and technology, digital cameras, mobile phone cameras or digital video cameras in the field of digital photography have higher and higher requirements for zoom and focus. While ensuring high-quality images, the volume requirements for zoom and focus devices are also increasing. More and more stringent, zoom, focusing device is developing towards the direction of miniaturization. [0003] A lens drive device commonly used in the market now such as image 3 As shown, the lens driving device includes a lens frame 1 , an iron shell 2 , a magnet 3 and a coil 4 , and the coil 4 is fixed on the lens frame 1 . The iron shell 2 is a ring-shaped overall structure, which has an outer ring 2a, an inner ring 2b inside the outer ring, and a yoke 2c connected between the top of the outer...
Claims
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IPC IPC(8): G02B7/04H02K33/18
Inventor 张国际刘宝廷
Owner JOHNSON ELECTRIC SHENZHEN