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Lens driving apparatus

A lens driving device and lens technology, applied in installation, instrumentation, optics, etc., can solve problems such as lack of magnetic force, and achieve the effect of low-cost manufacturing and low-cost production

Active Publication Date: 2010-12-08
MITSUMI ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in Patent Document 4, since the magnets are arranged on four sides (quadrilateral shape) or in a hexagonal shape, if they are arranged in a limited space of a square (quadrilateral), there will be a surplus space on the outer peripheral side, so not only The remaining space is a pity in the configuration of the magnet, and there are problems such as not being able to obtain a large magnetic force

Method used

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Embodiment Construction

[0029] Embodiments of the present invention will be described below with reference to the drawings.

[0030] refer to Figure 1 to Figure 3 The lens driving device 10 according to one embodiment of the present invention will be described. figure 1 is an external perspective view of the lens driving device 10, figure 2 is a cross-sectional view of the lens driving device 10, image 3 It is an exploded perspective view of the lens driving device 10 . here, as Figure 1 to Figure 3 As shown, the Cartesian coordinate system (X, Y, Z) is used. exist Figure 1 to Figure 3 In the state shown in the diagram, in the Cartesian coordinate system (X, Y, Z), the X axis is the front and back direction (depth direction), the Y axis is the left and right direction (width direction), and the Z axis is the up and down direction (height direction). Moreover, in Figure 1 to Figure 3 In the example shown, the up-down direction Z is the direction of the optical axis O of the lens.

[0031] ...

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PUM

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Abstract

The invention provides a lens driving apparatus (10) which is cheap. A lens holder (14) has a cylindrical portion (140) adapted to hold a lens assembly. A driving coil (16) is fixed to the lens holderThe invention provides a lens driving apparatus (10) which is cheap. A lens holder (14) has a cylindrical portion (140) adapted to hold a lens assembly. A driving coil (16) is fixed to the lens holder so as to be positioned in a circumference of the cylindrical portion. A yoke (20) has a permanent magnet opposed to the driving coil. A front spring (22) and a rear spring (24) are provided on both sso as to be positioned in a circumference of the cylindrical portion. A yoke (20) has a permanent magnet opposed to the driving coil. A front spring (22) and a rear spring (24) are provided on both sides of the cylindrical portion of the lens holder in an optical axis (O) direction of the cylindrical portion and movably support the lens holder in the optical axis direction in a state where the leides of the cylindrical portion of the lens holder in an optical axis (O) direction of the cylindrical portion and movably support the lens holder in the optical axis direction in a state where the lens holder is positioned in a radial direction of the cylindrical portion. The driving coil is formed in a 4N polygonal cylindrical shape and the permanent magnet has 4N rectangular permanent magnet pins holder is positioned in a radial direction of the cylindrical portion. The driving coil is formed in a 4N polygonal cylindrical shape and the permanent magnet has 4N rectangular permanent magnet pieces (182), where N is an integer not less than 2.eces (182), where N is an integer not less than 2.

Description

technical field [0001] The present invention relates to a lens driving device, in particular to a lens driving device for auto-focusing used in a portable compact camera. Background technique [0002] A portable compact camera is mounted on a camera-attached mobile phone. A lens drive device for autofocus is used in this portable compact camera. Conventionally, various autofocus lens driving devices have been proposed. [0003] For example, Patent Document 1 (Japanese Patent Laid-Open No. 2005-128392 ) discloses a lens driving device excellent in impact resistance. The lens drive device disclosed in Patent Document 1 has: a substantially cylindrical yoke; a base mounted on the yoke; a lens support (lens holder) disposed on the inner peripheral side of the yoke; A pair of leaf springs on a support. A pair of leaf springs is also called a front spring and a rear spring. The front spring is disposed on the front side (one side) of the lens support in the optical axis direc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B7/04G02B7/08
CPCG02B13/001G02B7/08
Inventor 高桥守
Owner MITSUMI ELECTRIC CO LTD