Optical film refers to the coating of one or more layers of film on the surface of various materials such as optical glass, optical plastic, optical fiber, crystal, etc., based on the interference effect of light in the film to change the intensity and polarization state of transmitted or reflected light And phase-changing optical components are an important part of modern optical instruments and optical devices.
The optical film is composed of a thin layered medium, which is a type of optical medium material that propagates light beams through the interface. The application of optical films began in the 1930s. Optical films have been widely used in the fields of optics and optoelectronics to manufacture various optical instruments. The optical film is processed on the basis of the optical base film. The optical base film is mainly made of polyester chips as the main raw material. It needs to meet the performance requirements of high light transmittance, low haze, and high brightness. Therefore, the optical base film is a poly Fields with higher technical barriers in the ester film industry.
A brief history of optical film technology: Optical film has a history of nearly 200 years. Of course, the development process of China's optical film industry is inseparable from the development of world optical film technology. From the beginning of the 19th century to the end of the 20th century, scientists from Germany and the United States made frequent researches on the basic scientific principles of optical films. The world's first anti-reflection films were born, and various important characteristics of optical films were gradually discovered. At the beginning of the 20th century, the technology and preparation process of optical film preparation equipment and coating product types were developed. The oil diffusion pump of the vacuum coating machine for manufacturing optical films appeared. As a kind of practical optical components, optical films have been widely used in optical systems. application. Especially at the end of the 20th century, with the rapid development of global optoelectronic technology, the popularization of notebook computers, mobile phones and LCD TVs, optical film devices are shifting towards high performance, high technical requirements and a wide range of applications.
Monopoly and leading situation: It is worth mentioning that there is a high degree of global monopoly in the production and supply of optical films. The global market for optical films is mainly composed of: Japan-Toray, Mitsubishi-Resin, Toyobo, South Korea-SKC , The United States-3M and other production and supply, especially the monopoly of the optical-grade PET film by giants in Japan and South Korea, thus forming a leading position in the global optical functional film market.