The inventor of the non-reflective glass is an American scientist Katherine Blodgett (1898 to 1979). This glass is completely transparent in any light. The U.S. women scientists is the first woman accepted by prestigious laboratories of General Electric Company, New York area. When she was only 19, a physical chemist and Nobel laureate Erwin Lang, Samuel (1881 to 1957) assistant. Owen is engaged in the study of the molecular film. Molecular film is a thin layer of material, such as single molecule paved pad. Blodget in the late 1930s found that a thin film of barium on the lens, the lens can reduce the total reflection light. Not reflective glasses was born.
The sunglasses can yin block uncomfortable glare, and can protect the eyes from UV damage. All of this is due to the metal powder filters, they can be when the light strikes the Select. Colored glasses can be selectively absorbed by the part of the band composed of the sun’s rays, that is, because it is by means of a very fine metal powder (iron, copper, nickel, etc.). In fact, when the light does not shine into the lens, based on the so-called “destructive interference” process, the light cuts. That is, when certain wavelengths of light (here refers to a UV-a, UV-b, sometimes infrared) passing through the lens, i.e. the inside of the lens toward the direction of the eyes, they will cancel each other out. The formation of light waves overlap is not by chance: the crest of a wave with its wave trough close together, led to cancel each other out. Destructive interference phenomena vary depending on the refractive index of the lens (i.e., the light from the air passing through different substances occurs when the degree of deviation), and also vary depending on the thickness of the lens. Generally speaking, little variation of the thickness of the lens, the refractive index of the lens varies according to differences in chemical composition.
Polarized glasses provides another mechanism to protect the eyes. Asphalt reflected light special polarized light. This reflection light and direct light from the sun or any artificial light source is different since in that order. Polarized light shock wave formed by the full in one direction, and general light is opened by non-directional vibration wave. It’s like a group of disorderly move around freely with a group of soldiers marched in neat marching pace as stark by. Generally speaking, the reflected light is a light orderly. Polarizing lenses in this light barrier is particularly effective because the filter in the role. This lens is only through the vibration toward a certain direction of polarization, like light “combing” the same. For road reflective questions, the use of polarized glasses to reduce the transmission of light through because it will not let the light waves vibrate parallel to the road. In fact, the long molecules of the filter layer is oriented in the horizontal direction, and can absorb the horizontally polarized light line. Thus, most of the reflected light is eliminated, while the illumination of the surrounding environment is not reduced.
Finally, the lens color glasses in the sun’s rays shot to darken. When the lighting is weakened, it also re-opened. It does so because the silver halide crystals at work. Under normal circumstances, it enables the lens to maintain a perfect transparency. In sunlight exposure, the silver crystals separated, the silver in the free form small aggregates formed within the lens. These small silver aggregation takes the shape of interlocking irregular blocks, they can not transmit light, but can only absorb light, the result of the lens to darken. In brightness, crystal and re-formed, the lens has resumed to the bright state.
Glass lens made of glass processing, subject to the four processes. Let us look at the production of glass, big businessmen, the Americans Corning color processing program. The first step is melted, the basic mixture was heated to 1100 to 1500 ° C.
The next step is the refining, i.e. further increase the temperature of the glass to make it more fluidity and the gas remains in the glass after melting exclude. Glass from the melting prime tube out waiting to be cut in order to form an accurate mass, referred to as “glass droplets, and then sent to suppress. In Cognis use this program, the coloring metal powder required in the smelting process has been added to it, and this is different from the other methods unique. The general method is combined with a colored layer on the lenses made.
The glass drip into the mold, the mold determines the outer diameter of the lens and bending, that is made of further processing into the glass of the lens blank. At this time, once again heating the glass, and finally sent to polished (polished surface) and polishing (the lens to achieve perfect transparency).