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A film with adjustable transparency and its use

A technology of transparency and wrinkle, applied in the field of intelligent soft materials, can solve the problems of difficulty in popularization, high cost of electrochromic film, high production cost, etc., and achieve the effect of simple and convenient structure, intelligent privacy, and low cost.

Active Publication Date: 2022-04-12
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As described in Chinese patent CN204252752, a smart hidden window is composed of three parts: a support frame, a color-changing glass and a controller. It is composited into color-changing glass, and the transparency and lighting conditions of the window can be adjusted at any time through the external power supply of the controller. It has good privacy and flexible adjustment. However, due to the high cost of electrochromic film, it is difficult to popularize.
For example, Chinese patents CN202929326 and CN202472180 both use liquid crystal layers to make dimming glass, which can prevent peeping, but the production cost is expensive and continuous power supply is required

Method used

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  • A film with adjustable transparency and its use
  • A film with adjustable transparency and its use
  • A film with adjustable transparency and its use

Examples

Experimental program
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Embodiment 1

[0060] In this embodiment, the film with adjustable transparency is made of dielectric elastomer, and a high-voltage generator is used as the excitation method to illustrate the specific realization of the film with adjustable transparency of the present invention that uses intrinsic strain to generate wrinkles to adjust transparency.

[0061] The schematic diagram of embodiment process is as figure 1 , figure 2 , image 3 shown.

[0062] Such as figure 1 shows the dielectric elastomer film in its initial state, with an initial length l s10 , with a width of l s20 , fix both ends perpendicular to the x-axis. Then the dielectric elastomer film is stretched, and after stretching, the length and width become l s11 and l s21 , where l s21 = l s20 . Therefore, the pre-stretching multiple of the dielectric elastomer film is λ 11 = l s11 / l s10 . Then use a rigid frame with length and width l f1 and l f2 , fixed at the center of the stretched dielectric elastomer fil...

Embodiment 2

[0120] In this embodiment, VHB4905 produced by 3M Company is used as a film with adjustable transparency to make a smart window. Figure 9 is a schematic diagram of a glass with tunable transparency. The smart window consists of a sandwich structure with a dielectric elastomer film in the middle and transparent electrodes on both sides, and then packaged in a transparent plastic box, such as Figure 9 (a) shown. The length and width of the glass are 8cm and 4.5cm respectively, and the pre-stretching multiple is 1.5. Before the voltage is applied, the light can directly pass through the film, and the film has a high light transmittance. After the voltage is applied (φ=10kV), the film will wrinkle, and the light passing through the film will be refracted and deviate from the original direction. When the folds are striped, the direction of light refraction will change with the shape of the folds, such as Figure 9 (b).

[0121] Such as Figure 9 The result shown in (c) shows...

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Abstract

The present invention provides a film with adjustable transparency. The film is an intelligent soft material film with uniform thickness. The above is equal everywhere, and the wavelength of the wavy folds is regulated by the thickness of the film and the stress state before applying external field excitation. The film with adjustable transparency of the present invention utilizes its intrinsic strain to generate regular wavy folds, and quantitatively adjusts the transparency of the film by controlling the magnitude of external field excitation. Applying the film with adjustable transparency described in the present invention to the anti-peeping glass greatly improves the operability and intelligence of the anti-peeping glass, and forms an intelligent anti-peeping window with adjustable transparency, which is low in cost and disconnects after power on The switch can still maintain the adjusted transparency, energy saving and environmental protection. The film with adjustable transparency of the present invention can also be used in optical devices and optical sensors, especially in smart gratings, which can effectively improve the operability of the gratings.

Description

technical field [0001] The invention relates to the field of intelligent soft materials, in particular to a film with adjustable transparency and its application. Background technique [0002] The research and application of intelligent soft materials is an important field for the development of science and technology in today's society. Through the design of materials and structures, fast response, light weight and cheap dimming devices can be provided. Smart soft material membranes, such as dielectric elastomer membranes, have many advantages, including high energy density, fast response, no noise, light weight, and low cost. In the existing literature, intelligent soft material membranes can be used to make artificial muscles, adaptive lenses, peristaltic pumps, generators, etc. A typical dielectric elastomer actuator consists of a dielectric elastomer film and flexible electrodes coated on both sides of the film. When a high voltage is applied on both sides of the memb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/01
CPCG02F1/0102
Inventor 毛国勇伍磊梁雪雅曲绍兴
Owner ZHEJIANG UNIV
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