Lens autofocus drive

A technology of automatic focusing and driving device, applied in focusing devices, installations, instruments, etc., can solve problems such as affecting the focusing effect, and achieve the effect of precise control

Active Publication Date: 2022-07-05
TDK TAIWAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, in the process of moving the lens module, the control of its dynamic inclination will affect the quality of the overall focusing effect

Method used

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  • Lens autofocus drive
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  • Lens autofocus drive

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Embodiment Construction

[0055] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention can also be implemented in other ways different from those described herein, and those skilled in the art can do so without departing from the connotation of the present invention. Similar promotion, therefore, the present invention is not limited by the specific embodiments disclosed below.

[0056] figure 1 It is a schematic diagram of the appearance of a lens autofocus driving device 10 according to a preferred embodiment of the present invention. figure 2 It is an exploded schematic diagram showing the components of the lens autofocus driving device 10 . image 3 It is a schematic top view of the lens autofocus d...

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Abstract

The invention relates to a lens automatic focusing driving device at least comprising a fixing ring, which is arranged on an upper surface of a base; a plurality of limiting elements, which are respectively erected on the fixing ring; a lens barrel, which is arranged on the base above and between these limiting elements, and an outer side of the lens barrel has a plurality of convex portions and concave portions, wherein a concave portion and the corresponding limiting element form a setting space; an actuator, which is arranged on the base The upper surface of the device has two sets of electrode terminal pairs and two sets of oppositely arranged shape memory alloy wires, wherein the middle section of each shape memory alloy wire is in contact with the corresponding convex part of the lens barrel, and its two ends are respectively connected to each group of electrodes. Electrodes of the terminal pair; a plurality of groups of balls, which are located in the corresponding setting spaces, and are respectively in contact with the limiting element and the surface of the concave portion. The invention can make the lens barrel move relative to the base along the optical axis, and can limit the inclination angle when the lens barrel moves, and can control the automatic focusing function of the lens relatively accurately.

Description

technical field [0001] The invention relates to a lens focusing drive device, in particular to a lens automatic focusing drive device using a shape-memoryalloy (SMA) wire. Background technique [0002] The auto focus (Auto Focus) actuator of the mobile phone camera module is one of the indispensable standard equipment of the current smart phone. It needs to move the lens module to achieve the auto focus function when shooting. [0003] There are also many different technologies for the design of AF actuators, such as voice coil motor (VCM), piezoelectric motor (piezoelectric motor), shape memory alloy wire. At present, the most widely used voice coil motor has the advantages of low cost, high production qualification rate and mature technology. However, the voice coil motor still has some shortcomings, such as slow focusing speed, large power consumption, and being affected by magnetic force, so many new technologies are still being discussed. Compared with voice coil moto...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B7/09G03B13/36
CPCG02B7/09G03B13/36
Inventor 丘祺纬
Owner TDK TAIWAN
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