Antistatic optical film

Abstract

The invention relates to an antistatic optical film which comprises a base material with a first impedance value R1 and an antistatic layer arranged on the surface of the base material, wherein the antistatic layer is provided with a second impedance value R2, and the R2 is less than 1013Omega / mm<2> and R1 / R2 is less than 1010. The antistatic function of the optical film is provided by the antistatic layer, and the second impedance value R2 is required to be small enough to be beneficial to rapidly removing the static and improving the antistatic effect, therefore the R2 is less than 1013Omega / mm<2>. The difference value between the R1 and the R2 can not be overlarge so as to prevent the static charge from accumulating on the surface with high impedance, therefore, the R1 / R2 is less than 1010. By controlling the R2 value of the antistatic layer and the difference value between the R2 and the R1, better antistatic effect can be provided.

Description

technical field [0001] The invention relates to an optical film, in particular to an optical film which has functions such as light collection or light atomization and diffusion, and also has an antistatic effect. Background technique [0002] Ordinary optical films, such as mirror films with light-collecting effects, or dual-function optical films with both light-collecting and light-diffusing effects, are covered with a protective film on the surface to prevent the optical film from being damaged by collisions during transportation. damage. Before the use of the above-mentioned optical film, the protective film must be torn off from the surface of the optical film, resulting in static electricity between the protective film and the optical film due to friction, often causing the operator to be electrified by static electricity, and the existence of static electricity will make the optical film The surface is easy to absorb dust, which affects the quality of the optical fi...

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Problems solved by technology

[0004] It is generally believed that the antistatic effect can be achieved by setting an antistatic layer with good conductivity. However, the inventors of this case have found through many experiments that the antistatic effect can not be achieved by simply reducing the impedance value of the antistatic layer. For example, when When the surface impedance value of the antistatic layer was 460Ω / mm2, there was still static electricity, which caused the operator to get an electric shock. After further investigation, it was found that the impedance value of the high-impedance surface without antistatic treatment was 1.92×1016Ω / mm2 , the difference from the impedance value of the aforementioned low-impedance surface is very large, so after further experimental research, the inventors found that even if the optical film is coated with an antistatic layer, as long as the impedance value difference between the high- and low-impedance surfaces is too large, the electrostatic charge will still Stored on a high-impedance surface, when the operator directly takes the optical film by hand, there will still be a similar connection effect and be charged by static electricity, which will injure the operator

In addition, static electricity may be generated by the friction between the diaphragms in the module in the future. Because the diaphragm stacks and rubs, the effect of charge storage is similar to the capacitive effect, so the impedance of one side is too low and the impedance of the other side is too high. Stores charge like a layer capacitor, once there is a contact, it will be turned on and discharged

[0005] Therefore, it is known from practical experience that the antistatic effect can not be improved only by coating an antistatic layer. The impedance difference between the low-impedance surface of the antistatic layer and the high-impedance surface without antistatic treatment must also be controlled. No studies have addressed the above phenomenon

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