Тайните на лещите за слънчеви очила

Sunglasses, as the name suggests, are "glasses that prevent damage to the naked eye from sunlight (ultraviolet rays)". Biologists propose from the perspective of protecting human vision to prevent strong light from irritating the eyes, such as wearing dark glasses when encountering welding arc light, snow light, or direct sunlight, and not for too long.

Scientists have discovered that certain types of glass can change color through light or electricity while studying special glass. That is to say, when glass is exposed to light, its absorption spectrum undergoes reversible changes, thus possessing the characteristics of photosensitivity and color reversibility. By utilizing this color changing property, colored sunglasses can be made.

В допълнение, учените са открили, че много полимерни прозрачни материали отговарят на изискванията на оптичните лещи при разработването на полимерни материали . Някои полимерни прозрачни материали имат светлинна пропускливост, сравнима с стъклото и могат да се използват за направата на лещи . като резултат, много пластмасови лещи са излъчени .

И така, какви са новите материали за полимерни лещи, които могат да се използват и като лещи за слънчеви очила?

Polymer materials used in optical lenses have a longer history of application than color changing glass. Its earliest attempts began in the United States during World War II. At that time, they successfully used a low precision casting method to manufacture lenses using a thermosetting resin CR-39, and developed eyeglass lens products that were launched on the market. This method is все още се използва днес .

It should be noted that there is a coating process involved in the production of lenses. No matter what material is used or what processing method is used to make the lens, it must be coated on the surface of the lens to achieve better optical, chemical, and mechanical properties. In this way, we use physical or chemical methods to leave a layer of film on the lens, some are single-layer films, some are Многослойни филми, някои са отразяващи филми, твърди филми, защитни филми ... Има и филми с различни цветове, като зелен филм, червен филм, син филм, лилав филм и т.н. {.