Varifocal double-liquid lens based on inverse piezoelectric effect

A reverse piezoelectric effect and two-liquid technology, applied in the direction of lenses, instruments, optics, etc., can solve the problems of reduced surface tension effect and inappropriateness, so as to reduce aberration, improve reliability, and improve mechanical shock resistance Effect

Inactive Publication Date: 2011-01-19
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The electrowetting phenomenon depends on the surface tension of the liquid, and the effect of the surface tension decreases sharply when the geometric size becomes larger, so the electrowetting driving technology is not suitable for larger-scale liquid lenses

Method used

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  • Varifocal double-liquid lens based on inverse piezoelectric effect
  • Varifocal double-liquid lens based on inverse piezoelectric effect
  • Varifocal double-liquid lens based on inverse piezoelectric effect

Examples

Experimental program
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Embodiment Construction

[0014] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0015] figure 1 It is a liquid lens that relies on the inverse piezoelectric effect to adjust the focal length. like figure 1 As shown, a cylindrical chamber is filled with two liquids 3 and 4 with different refractive indices. The two liquids are transparent and have different refractive indices. They can be dissolved in distilled water, potassium chromate, ethylene glycol and other liquids. choose. Distilled water with a refractive index of 1.33 and 63% potassium chromate solution with a refractive index of 1.5 selected in the embodiment are separated by a transparent elastic membrane 1 (such as a polydimethylsiloxane (Polydimethylsiloxane, PDMS) film). The two end faces 5 of the shaped chamber are sealed with transparent glass sheets. The cavity wall 2 of the cylindrical cavity is made of PZT piezoelectric ceramics, and an electrode 6 (a...

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Abstract

The invention discloses a varifocal double-liquid lens based on inverse piezoelectric effect. An accommodating chamber wall is made of a piezoelectric material; an accommodating chamber is internally divided into an upper chamber and a lower chamber by a transparent elastic membrane; different liquids are filled in the two chambers; electrodes are respectively arranged in places where a container wall is connected with an upper end cover and a lower end cover of the accommodating chamber and the membrane, wherein a voltage is connected between two electrodes arranged above the membrane, and the other voltage is connected between two electrodes arranged below the membrane; the piezoelectric material generates the inverse piezoelectric effect to deform through regulating the polarity and the size of the two voltages, so as to change the liquid lens curvature to achieve the zooming effect of the lens. The invention solves the drive technique limitation of the traditional liquid lens, and enlarges the selection range of two liquids to increase the zooming range.

Description

technical field [0001] The present invention relates to a liquid lens containing two different liquids, and more particularly, to a liquid lens whose focal length is adjusted by virtue of the inverse piezoelectric effect of a piezoelectric material. Background technique [0002] The commonly used lens module uses a lens made of a solid with a fixed focal length. In order to adjust the focal length, this lens module uses multiple solid lenses. During adjustment, additional moving mechanical parts cause the zoom lens to have a complex structure and control accuracy. and reliability are severely limited. [0003] Another class of liquid lenses consists of two different liquids in direct contact, is characterized by a simple internal structure, and is easier to adjust the focus. The principle of this type of liquid lens is to adjust the focal point by changing the radius of curvature of the interface (or meniscus) between liquids by means of electrowetting. The electrowetting ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B26/02G02B3/14
Inventor 陈瀚吴健康张峰
Owner HUAZHONG UNIV OF SCI & TECH
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