The cleaning of optical glass is divided into cleaning before coating and cleaning after coating. The processor should adopt different cleaning methods according to the different pollutants before and after coating, and choose a special optical glass cleaning agent before coating.
1, cleaning before coating
The main pollutant of cleaning before coating is core oil (also called edging oil) , Seeking core, also known as core positioning and core removal, refers to the process selected to obtain the specified radius and core accuracy), fingerprints, dust, etc. Since the coating process has extremely strict requirements on the cleanliness of the lens, the choice of cleaning agent is very important. While considering the cleaning ability of a certain cleaning agent, we must also consider its corrosiveness and other issues.
The cleaning of optical lenses before coating is generally the same as cleaning after polishing.
2, cleaning after coating
generally includes cleaning before inking, cleaning before joining, and cleaning before assembly, where joining Pre-cleaning (joining refers to bonding two lenses with photosensitive glue into a prescribed shape to meet the requirements that cannot be processed at one time, or to create a more special curvature and light transmittance process) is the most stringent. The pollutants to be cleaned before joining are mainly a mixture of dust, fingerprints, etc. The cleaning is not difficult, but there are very high requirements for the cleanliness of the lens surface, and the cleaning method is the same as the previous two cleaning processes. Since the coating layer is more susceptible to strong alkaline damage, the strong alkaline lens design cleaning agent cannot be used after coating. A dedicated optical glass cleaning agent after coating is required. This cleaning agent does not damage the film layer, has strong detergency, and can be intact Save the film. Therefore, after optical glass coating, it is generally recommended to use a professional optical glass cleaning agent after coating.
Optical glass refers to glass that can change the direction of light propagation and can change the relative spectral distribution of ultraviolet, visible or infrared light. Optical glass in a narrow sense refers to colorless optical glass; optical glass in a broad sense also includes colored optical glass, laser glass, quartz optical glass, anti-radiation glass, ultraviolet and infrared optical glass, fiber optical glass, acousto-optic glass, magneto-optical glass, and photochromic glass. Optical glass can be used to manufacture laser lens lenses, prisms, mirrors and windows in optical instruments. Components made of optical glass are key elements in optical instruments.
Optical glass has a high degree of transparency, a high degree of physical and chemical uniformity, and specific and precise optical coefficients. Today we will mainly understand the physical properties of optical glass:
1, refractive index (ND)
glass refraction The rate is measured by the characteristic spectral line of sodium element Du003d589.3nm, expressed in ND.
2, specific gravity(s)
Use the hydrostatic weighing method to measure the specific gravity of glass.
3, chromaticity value (x,y,Y)
According to the International Commission on Illumination (CIE) high-power laser The lens set in 1931 and 1964 stipulated the method to determine the chromaticity value of the glass under the illumination of A and D65 standard light sources.
4. Thermal characteristics
5. The relative change rate of length when the glass temperature rises by 1℃.
6. Transition temperature (Tg)
When the swelling volume of the glass changes suddenly, the corresponding temperature That is the transition temperature of the sample. At this temperature, the viscosity of the glass is close to 1013 Pa.sec.
7, softening temperature (Ts)
When the physical properties of glass change sharply, its swelling volume also tends to The temperature close to zero is the softening temperature of the glass. At this time, the viscosity of the glass approaches 1011 Pa.sec.
Reflector 8, color temperature conversion ability (V)
The color temperature glass consists of two types of glass glass: increasing color temperature and decreasing color temperature Composition, and its transforming ability is expressed by the Mired value. The rising color temperature glass is blue, the grade is SSB, and it has a negative Millard value. The color temperature glass is amber, and its Millard is positive.
Optical glass is the foundation and important part of the optoelectronic technology industry. In today's society, with the continuous integration of optics, electronic information science, and new material science, the application of optical glass as the basic material of optoelectronics in the three fields of optical transmission, optical storage and optoelectronic display has advanced by leaps and bounds. One of the basic conditions for the development of information technology.