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lens driver

A technology of lens driving device and lens frame, which is applied in the direction of projection device, printing device, focusing device, etc. It can solve the problems of difficult to ensure the accuracy of position detection, the inability to increase the magnetic field strength, and the enlarged shape of the camera actuator, so as to achieve position detection. The effect of excellent precision

Active Publication Date: 2016-02-24
ALPS ALPINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the above-mentioned conventional lens driving device, since the permanent magnet is magnetized by NS in the direction perpendicular to the optical axis direction, it is impossible to increase the intensity of the magnetic field input to the Hall element arranged below the magnet, and it is difficult to Issues such as securing position detection accuracy
In addition, when the magnetized area of ​​the magnet is increased for the purpose of increasing the strength of the magnetic field input to the Hall element in order to improve the position detection accuracy of the Hall element, there is a possibility that the outer shape of the camera actuator will change due to the enlargement of the magnet. Large size makes it difficult to miniaturize the lens drive device

Method used

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no. 1 approach

[0032] figure 1 as well as figure 2 It is an exploded perspective view of the lens driving device 1 according to the first embodiment of the present invention. image 3 as well as Figure 4 It is an exploded perspective view of the autofocus actuator 2 included in the lens driving device 1 of the present embodiment. exist figure 1 as well as image 3 In , the lens driving device 1 of this embodiment is shown from the upper side, and in figure 2 as well as Figure 4 In , the lens driving device 1 of this embodiment is shown from the lower side.

[0033] like figure 1 as well as figure 2 As shown, the lens drive device 1 is configured to include: an autofocus actuator 2 for an autofocus function for focusing a camera; On the other hand, it is a shake correction actuator for the shake correction function that keeps the photographing optical axis constant.

[0034] like image 3 as well as Figure 4As shown, the autofocus actuator 2 as the first holding body is conf...

no. 2 approach

[0106] In the lens driving device 100 of the second embodiment, the shape and arrangement of the magnet 153 of the pair of magnets 15a to 15d and the arrangement of the magnetic detection elements 19a and 19b are different from the lens driving device of the first embodiment. 1 is different. Hereinafter, the structure of the lens driving device 100 of the second embodiment will be described focusing on differences from the lens driving device 1 of the first embodiment.

[0107] Figure 11 It is a bottom view when the printed circuit board 20 and the base member 3 are removed from the lens driving device 100 . The magnet 153 of the pair of magnets 15a to 15d of the lens driving device 100 is configured to have, like the magnet 152 of the pair of magnets 15a to 15d of the lens driving device 1 of the first embodiment, an inner side facing the lens driving device 100 at one end. The bent portion 153a bent perpendicularly has a linear portion at the other end, and has a substantia...

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Abstract

The invention provides a lens driving device which becomes smaller and of which the position detection is more accurate. In the lens driving device (1), a set of opposite side surfaces are arranged along the optical axis direction of an automatically focusing actuator (2) to allow a pair of magnets (15a, 15c) to be arranged in such a manner that same polarities are opposite. A pair of magnets (15b, 15d) are arranged on other side surfaces in such a manner that same polarities are opposite, and a magnet detection elements (19a, 19b) are arranged in such a manner that one end of a magnet (152) of the magnet (15c) overlaps with one end of a magnet (152) of the pair of magnets (15b, 15d). The oppositely arranged poles of the pair of magnets (15a, 15c) are different from the oppositely arranged poles of the pair of magnets (15b, 15d).

Description

technical field [0001] The present invention relates to a lens driving device, and particularly relates to a lens driving device suitable for shake correction of a relatively small camera mounted on a mobile phone or the like. Background technique [0002] In recent years, the demand for high performance and high functionality of cameras mounted on mobile phones and the like has increased, and lens driving devices mounted on mobile phones with cameras and the like have been required to have not only an autofocus function but also shake correction. Function. As a lens drive device having a shake correction function, for example, a structure including a shake correction coil arranged outside the permanent magnet to face the permanent magnet of the autofocus lens drive device has been proposed (for example, refer to Patent Document 1). [0003] Patent Document 1: Japanese Patent Laid-Open No. 2011-065140 [0004] However, in the above-mentioned conventional lens driving devic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03B5/00G02B7/09G03B13/36H04N5/232
Inventor 木原孝
Owner ALPS ALPINE CO LTD