Electromagnetic driver and lens driving device provided with same

A lens driving device and electromagnetic driver technology, applied in electromechanical devices, installations, instruments, etc., can solve the problems of difficult miniaturization, limited lens travel, uncomfortable cameras, etc., and achieve the effects of low cost, compact structure, and unlimited travel.

Inactive Publication Date: 2013-04-17
JOHNSON ELECTRIC SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the above-mentioned existing lens driving device, the stroke of the lens is limited by the iron shell; moreover, since the magnet is opposite to the coil, it occupies a larger radial dimension, so it is difficult to miniaturize, and is not suitable for the current portable camera. small fashion trends

Method used

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  • Electromagnetic driver and lens driving device provided with same
  • Electromagnetic driver and lens driving device provided with same
  • Electromagnetic driver and lens driving device provided with same

Examples

Experimental program
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Embodiment Construction

[0024] see figure 1 , the electromagnetic driver according to an embodiment of the present invention includes an elastic mounting frame 20 , a permanent magnet 30 , a driving coil 40 , and a moving body 50 .

[0025] In this embodiment, the mounting bracket 20 is cylindrical, including a cylindrical inner ring 22 , a cylindrical outer ring 24 , an annular yoke 26 connecting the ends of the inner ring 22 and the outer ring 24 . The extending portion 28 extends from the end of the inner ring 22 away from the yoke portion 26 toward the outer ring 24 , and an axial through hole 27 is formed in the inner ring 22 . In this embodiment, the magnet 30 is a ring magnet, polarized in the axial direction, and fixed on the outer surface of the inner ring 22 . The coil 40 is fixed on the inner surface of the outer ring 24 of the mounting frame 20 , and both ends of the coil 40 are electrically connected to an external power source. The moving body 50 is accommodated in the mounting frame ...

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PUM

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Abstract

The invention provides an electromagnetic driver which can move forwards or backwards relative to a fixed body. The electromagnetic driver comprises an elastic mounting frame, a permanent magnet, a driving coil and a moving body, wherein the mounting frame comprises an outer ring, an inner ring and a yoke part for connecting the outer ring with the inner ring, one of the permanent magnet and the driving coil is fixed with the outer ring, and the other one is fixed with the inner ring; the magnet is polarized along the axial direction of the moving body, the moving body is fixed to the inner ring, and the outer ring can be in frictional connection with the fixed body. When the driving coil is connected with a driving signal which can enable the mounting frame to slowly deform and recover rapidly, the electromagnetic driver moves forwards or backwards relative to the fixed body. The invention also provides a lens driving device which applies the electromagnetic driver. The lens driving device has compact structure, low cost and unconstrained lens stroke.

Description

technical field [0001] The invention relates to an electromagnetic driver and a lens driving device with the motion system. Background technique [0002] With the popularity of portable camera devices such as camera phones and the diversification of their functions, portable camera devices with auto-focus lenses will have increasingly broad market prospects. [0003] The existing auto-focus portable camera devices on the market usually use electromagnetic induction motors, which have the advantages of high rotational speed and high efficiency. The common method of the lens driving device of this electromagnetic induction motor is to drive the lens to move on the optical axis through the electromagnetic force generated by the coil and the magnet. [0004] Fig. 6 shows a kind of lens driving device that adopts electromagnetic force to drive in the prior art, comprises iron case 11, magnet 12, coil 13 and lens frame 14, and magnet 12 and iron case 11 are fixed as fixed part, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B7/04H02K33/18
Inventor 王志松刘立生
Owner JOHNSON ELECTRIC SHENZHEN
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