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Lens driving unit

A lens driving device and lens technology, which can be applied to electromechanical devices, installations, instruments, etc., can solve the problems of incapable of miniaturizing movable parts, and it is difficult to realize the miniaturization of the lens driving device, and achieve the effect of miniaturization

Inactive Publication Date: 2010-06-09
MITSUMI ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the size of the movable part cannot be miniaturized
Therefore, there is a problem that it is difficult to realize the miniaturization of the lens driving device.

Method used

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  • Lens driving unit
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0022] refer to figure 1 , in order to facilitate the understanding of the present invention, the related lens driving device 10 will be described. figure 1 It is a schematic sectional view showing main parts inside the lens driving device 10 . exist figure 1 In the example shown, the up-down direction is the direction of the optical axis O of the lens.

[0023] However, in an actual use situation, the direction of the optical axis O, that is, the up-down direction is the front-rear direction. In other words, the upward direction is the front direction, and the downward direction is the rear direction.

[0024] The illustrated lens driving device 10 is equipped with a mobile phone with an auto-focusable camera. The lens driving device 10 is used to move the lens drum 12 including the first to third lenses L1 , L2 , L3 in the optical axis O direction. The lens driv...

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PUM

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Abstract

The invention provides a lens driving unit which can be minimized. In a lens driving device including a movable portion including a lens barrel having a plurality of lenses and a driving coil, a fixed portion including a magnetic field generating portion including a permanent magnet opposite to the driving coil, and an elastic member mounted to the movable portion and the fixed portion and supporting the movable portion in a direction of an optical axis shiftably so as to position the movable portion in a radial direction, the plurality of lenses are connected with the plurality of lenses fixed to each other. The lens holder holds only an uppermost one among the plurality of lenses and remaining ones in the plurality of lenses except for the uppermost one are put into an exposed state. The driving coil is disposed close to outer edges of the exposed lenses.

Description

technical field [0001] The present invention relates to a lens driving device, and more particularly to a lens driving device for autofocusing used in a portable compact camera. Background technique [0002] A portable compact camera is mounted on a mobile phone with a camera. A lens driving device for autofocus is used in this portable compact camera. Conventionally, various autofocus lens driving devices have been proposed (for example, refer to reference document 1: Japanese Patent Application Laid-Open No. 2008-122643). [0003] Generally, such an autofocus lens driving device includes a cylindrical lens holder holding a lens drum including a plurality of lenses, and a driving coil is fixed around the lens holder. A magnetic field generator including a magnet is disposed facing the driving coil. The magnetic field generating part is fixed on the base. A combination of a lens barrel (lens barrel), a lens holder, and a driving coil functions as a movable part of a lens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B7/04G02B7/09H02K33/18
CPCG02B7/08
Inventor 三浦伸之安食贤
Owner MITSUMI ELECTRIC CO LTD