The raw materials for the production of optical glass are some oxide, hydroxide, nitrate and carbonate, and the introduction of phosphate or fluoride in accordance with the requirements of the formula. In order to ensure the transparency of the glass, we must strictly control the content of colored impurities, such as iron, chromium, copper, manganese, cobalt, nickel and so on. Accurate weighing, uniform mixing. The main production processes are melting, forming, annealing and inspection.

Smelting with single crucible batch smelting method and tank furnace (see kiln) continuous smelting process. A single crucible melting method can be divided into clay crucible melting method and platinum crucible melting method. No matter what kind of smelting method is used, it is necessary to use a blender to mix, and the temperature and the stirring are controlled strictly, so that the optical glass liquid can reach a high degree of uniformity.

II optical glass forming method for forming a classical broken crucible method, rolling method and casting method. But now, more and more widely by leaking molding (using a single crucible or outflow continuous melting liquid), can directly pull rod or dropping pressure type or leakage material forming the large size of the blank, improve material drop efficiency of yield and usage.

Annealing in order to maximize the elimination of the internal stress of the glass to improve the optical uniformity, we must develop a strict annealing system for precision annealing.

The test indicators are: optical constants, optical uniformity, birefringence, stripes and bubble.

Glass lens molding technology is a kind of high precision optical components processing technology, it is the softening of the glass into high precision mold, under heating and pressurizing and anaerobic conditions, one-time direct molding out is achieved using the requirements of optical parts. This technology has now become one of the optical parts of the international most advanced manufacturing technology, because the technology can be directly used to press the molding precision of aspheric optical glass components, and since then I have created a optical instrument can be widely used in the era of aspherical optical glass components. Therefore, also to the design of optical system for photoelectric instrument brings new changes and development, not only the optical instrument reduced size, reduced weight, save material, reduce the workload of coating for optical element and the workpiece assembly, reduces the cost, but also improve the performance of optical instruments, optical imaging quality is improved.

Do you know how wide the application of optical glass molding technology is? Let's see it:

At present, the optical glass lens molding technology, has been used to mass production of precision spherical and aspheric lens. Usually, in addition to the general production of 15mm diameter of the lens, but also the production of large diameter 50mm diameter lens, micro lens array, and so on. A micro lens array with a diameter of 100 m for each lens is now available.

(1) spherical and aspheric optical glass components used in military and civil optical instruments, such as lenses, lenses, filters, etc.;

(2) aspheric lens with optical fiber coupler manufacturing;

(3) concentrating aspheric lenses for the manufacture of optical discs. The use of a compression molding method to create the aspherical optical glass lens, instead of a disk reader optical lens used in three piece spherical lens. Due to molding non spherical lens with high precision can not only control and correction of numerical aperture of axial aberrations, but also to make the weight of the original optical lens is reduced, and the cost is reduced by 30 to 50%.

(4) manufacturing camera viewfinder aspherical optical glass lens, film projector and camera lens aspheric lens etc..

At present, the market can play a role in the insulation of the monolithic glass has two kinds: stained glass and coated glass.

Colored glass, as the name suggests is the color of glass, including brown, gold, green, blue, gray series. This kind of transparent glass low, according to the national standard. The visible light transmission than the minimum value allowed in 18% - 25%, so it can block the sun visible in the part of the heat energy.

Coated glass, divided into the sun control coated glass and low radiation coated glass. Due to the glass surface plating a layer of metal objects, the sun in the wavelength range of 0.35 micron ---1.8 micron light has certain control effect; that is to say, the coated glass can in this wavelength range reduce the sun light transmittance, so insulation. The low radiation coated glass has a higher reflectance than that of the far infrared.

Glass in addition and in monolithic glass as the substrate, in the glass on the surface of the construction insulation film and the insulation coating liquid. Insulation film at present many varieties, many brands, many places in automotive applications is very extensive. Since there is no national standard for heat insulation film, a variety of brands in the function of publicity has varied, various terms seems to be non, causing consumer such as falling cloud in the mist.

Actually, the thermal insulation membrane is through in polyester plastic film formed on the surface of the metal objects to reduce the sun light on the glass of the transmission and heat insulation effect.

Heat insulation coating liquid on the market rare, mostly the coating liquid from a liquid to a film on construction environment and construction methods have certain requirements, the construction is not good will have certain effect on film forming coating liquid after the appearance of, although its thermal insulation function is thus reduced. With the same heat insulation film, heat insulation coating liquid is by coating solution of metal ions reduce the sun light on glass transmission of the insulation.

In addition to the above monolithic glass can be insulated, the reasonable combination of a few pieces of glass can also be insulated, which is hollow glass. Ordinary hollow glass, the monolithic glass itself can not be insulated, but through the combination of two or three layers of a single layer, and take time out of the air, the injection of inert gas, there is a certain heat insulation effect. Hollow glass insulation mechanism is to use the time to reduce the outer layer of the outer layer of glass heat absorption to the interior of the two heat transfer, but it is more obvious role or noise.

Assessment of the insulation effect of the glass, we should first look at the physical indicators. On the market some of the popular insulation terms and interpretation, such as infrared ray insulating rate, infrared reflectance, blocking the heat rate, heat rate equal to infrared blocking rate and give people passed a seems to be non concept, heat insulation is only separated by infrared.

In fact, we have to separate the heat, the heat source is the sun radiation from the. Solar radiation with the wavelength distribution known as solar radiation spectrum and solar radiation in the wavelength range is very wide, but the energy of the most concentrated in 0.17 - 4 microns. Among them, the visible region accounted for 50% of the, infrared region accounted for 43%, UV region accounted for 7%. In the infrared region, the vast majority of the concentration is below 1.8 microns, and only 3%--5% is distributed between 4 and 1.8 microns. The observations indicate that the solar radiation spectrum is not strictly continuous spectrum, in addition to the different proportions of different band entrained energy wavelength in order from short to long entrained energy ratio are very irregular. As in the infrared region below 1.8 micron, different band specific energy vary greatly. Therefore, such as the simple calculation of the average transmittance of infrared, can not see how much of the solar heat barrier, and even the number of infrared thermal energy is not reflected. Glass can be insulated, must be able to simultaneously block visible light, infrared, the effect is obvious, after all, visible light accounted for the bulk of the solar thermal energy. Assessment of the physical indicators of thermal insulation effect, our country's indicators are shading coefficient, that is, SC. According to the requirements of the public building energy efficiency design standard, the shading coefficient of the exterior window must be between 0.6 and 0.35. The lower the shading coefficient, the better the heat insulation effect. When have the heat insulation function of the monolithic glass shading coefficient of 0.6, if the sun direct light reflectance is about 6%, glass sun light {0.35 - 1.8 m} direct transmission than about at about 40% is was calculated in the absence of the secondary heat transfer, the glass is only through about 40% of the sun's heat, blocking the approximately 60% of the sun's heat.

In addition to the shading coefficient, the visible light transmittance of the glass should be compared. Because the building energy consumption, lighting energy consumption for 20 - 30%, in consideration of the energy-saving glass insulation, even as far as possible to meet the requirements of lighting. Otherwise, visible light transmission ratio is too low will lead to lack of natural lighting, even during the day have to turn on the lights, increases the energy consumption of lighting and lighting heat caused by indoor heat, increase the cooling load of air conditioning, increases the energy consumption of air conditioning system. The ideal choice is to improve the transmittance of visible light as far as possible, and the shading coefficient is lower, and the corresponding visible light transmittance is lower than that of the visible light. When shading coefficient of monolithic glass in 0.6, visible light transmittance to 45% is pretty good; if the visible light transmission ratio can be increased to 50% - 55%, it proves that the glass heat insulation of thermal infrared blocking high proportion and most transparent to visible light, thermal insulation, light transmittance function are good. National standards set the shading coefficient, but there is no visible light transmittance, can be interpreted as a standard is given a lot of difficulty, a little bit of heat insulation and light can not take into account the taste. There lies the problem, heat energy from the sun after all in the visible light that accounted for the bulk of; but if the heat insulation effect is good, shading coefficient reached 0.35 and visible light transmittance ratio is only 15% or 10%, or even lower, than the tinted glass is low, which will likely loss of the transmission function of the glass.

So, with insulated glass. The visible light transmission ratio should be with the shading coefficient in conjunction with consideration, shading coefficient high, corresponding to visible light transmission ratio should be high; low shading coefficient, visible light transmission ratio is low; however, the minimum should be shall not be lower than the standard of colored glass 18 - 25%. Must not be high, and the visible light transmission ratio is low.

Take several varieties of heat insulation glass with these two indicators are compared, the conclusion is very easy to come out. Under the condition of the same shading coefficient, the higher the visible light transmittance ratio, the better the comprehensive function of the heat insulating glass. In the above cited heat insulation glass, on the heat insulation effect of the worst colored glass, the sun shading coefficient of monolithic glass can not reach 0.6. The rest of the coated glass, insulating film glass, liquid coating glass insulation, shading coefficient of their types and varieties can reach below 0.6, worthy of comparison.

The glass, insulating film, insulating coating can in the construction of transparent glass, also can be in the colored glass, coated glass construction, after film coating liquid.

Regardless of any form of construction combination, can reduce the shading coefficient, improve the heat insulation effect. Each of these insulating glass also has weaknesses, such as light reflection ratio is too high, easy to cause light pollution; poor wear resistance; the construction process is dependent on the large, improper construction will affect the service life and the appearance of finished products. These are dependent on the use of objects to make choices based on the use of the purpose and use of the environment.

After the optical lens is fine grinding, the surface of the optical lens is about 2 - 3 m of the crack layer. Polishing and grinding mechanism, only the use of tool material and polishing liquid (the subject), polishing materials have cloth (cloth), polished leather (PU) and pitch (pitch, usually to achieve high precision polishing surface, the most commonly used materials for advanced polishing asphalt. Polishing with asphalt, by careful asphalt surface, driven by polishing grinding fluid lens surface heat, so that the flow of molten glass, fused to the rough vertices and fill cracks in the bottom, and gradually the crack layer is removed.

Regional quality are important in the optical lens: with the optical axis for a particular region of the center of, the region within the surface quality for scar / highlights of the gauge - Quality Regional: around the optical axis as the center of a specific area, in the region of surface quality for scars / highlights of the specification, this quality area outside the surface, in addition to the special provisions, the quality no strict requirement, this quality area outside the surface, in addition to the special provisions, on quality.

(general exterior inspection assumes a global surface for the mass region) (the general appearance of the test assumes that the global surface is a quality area)

(1) the drawings are generally marked with the maximum allowable size, but the cracks and scratches are usually not indicated.

(2) - split edge: refers to the edge of the lens, the edge of the lens is part of the surface of the glass off.

- crack: refers to the edge of the lens, the lens edge surface cracks, but the glass did not fall off.

Scratch - Bad: refers to the edge of the lens, a short scar.

(3) in addition to the special provisions, the three items can not be judged by the specification of the split edge.

The main use of organic solvent cleaning agent cleaning and asphalt paint. Cleaning solvents before use three chlorine ethane or trichloroethylene. Due to trichloroethane genus ODS consumption of ozone depleting substances) products, is currently in the mandatory elimination stage; while the long-term use of trichloroethylene easily lead to occupational disease and very unstable due to the trichloroethylene, easy hydrolysis was acidic, and therefore corrosion lenses and equipment. In this regard, development of domestic detergent manufacturers and production of non ODS solvent type series of cleaning agent can be used for cleaning optical glass; and the series of products with different physical and chemical indicators, can effectively meet the requirements of different equipment and technological conditions.

Optical lens has a stable optical properties, the main materials are colorless optical glass, colored optical glass, infrared optical materials, crystal materials, glass materials and plastic materials, such as a variety of optical materials.

The optical homogeneity of the optical lens is not consistent with the refractive index of each point in the same piece of glass, which is caused by the uneven temperature in the annealing furnace. Light through a refractive index inhomogeneous glass, can make each part of the optical path produce irregular change, thus affecting the imaging quality of the optical system.

Due to all kinds of new varieties of optical lens in the processing or use of the performance of more or less defects, so in the expansion in the field of optical glass, in order to improve the physical and physicochemical properties of all kinds of new varieties of optical glass. As well as the production process carried out a lot of work.

Haian Huihong photoelectric is a professional manufacturer of optical glass, the optical glass exceeded hundreds of varieties. For a long period of time, countries for their own production of various grades of optical glass components is strictly secret. If a country once by other countries get optical glass composition and after successful trial production of optical glass, they often still use these "classical" formula and little improvement, or is only relying on the experience for the local adjustment. Such as silica, boron trioxide, phosphorus pentoxide, Na2O, K2O, calcium oxide, barium oxide, magnesium oxide, zinc oxide, alumina and other composition and. The raw materials are cooled and condensed into a homogeneous, transparent, brittle, non crystalline substance after high temperature melting. Glasses glass mainly uses optical glass material, can be divided into two categories: colorless and colored optical glass. Optical glass variety, usually according to colorless optical glass refractive index or Abbe number size is divided into two kinds of crown and flint glasses.

The production technology of the Haian Department of Hong photoelectric quartz glass is as follows:

A melting furnace, melting furnace manufacturing: Clay furnace and furnace platinum two. In recent years, optical glass infiltrated rare elements are used to maintain the stability of the quality of small platinum furnace.

Second, into the optical glass raw materials: melting furnace (especially clay oven) after drying for a long time, add in accordance with special formula and selected other raw materials in melting furnace to melt.

Three, heating, melting, mixing, heating conditions, as materials and. However, all kinds of materials must be uniform, in order to homogeneous.

Four, cooling: for a long time to be Xu Leng". However, the length of time is also due to different materials, which is the most important process to ensure the quality of the best.

Five, splitting furnace, sorting out massive clay: split furnace, rough and don't choose it.

Six, inspection, testing, inspection or testing: integer by its performance, to ensure the excellent quality of quartz glass.

Seven, cutting and chamfering (trimming): the massive crude embryo in accordance with the purpose and specifications to be cut into small pieces and chamfer.

Eight, after the embryo is formed: the crude embryo is heated and softened, according to the specifications of the engineering drawing, and the embryo is formed. However, prior to the preparation or preparation of a variety of molds, tools and auxiliary materials, etc..

Nine, burn blunt: annealing passivation, eliminate internal stress.

Ten, testing, inspection: Test of the optical properties and appearance of the embryo. Optical quartz glass of the finished product will become the downstream industry (optical components manufacturing plant) of the hair embryo, continue to process after grinding, as optical components.

The gas in the melting from raw materials produced by the (gas), will remain in the glass, like bubbles, bubbles are as follows. There are traces of mixing in the glass as a layer of residual, as stripes, known as: veins.

In addition to optical quartz glass, the main component of the benefit of the special glass factory is a soda lime silicate system, the refractive index is 1.51, the visible light transmittance of 89% or more, can absorb ultraviolet 280nm.

Optical white film mainly composed of calcium sodium silicate system, and the refractive index of 1.531, Abbe number 60.5, transmittance is above 91%, anti ultraviolet performance is the worst. UV optical white film is in optical slices of white ingredients to add a small amount of titanium oxide and cerium oxide, so that it has a UV absorbing performance and the refractive index is 1.523, Abbe number 58.7, light transmission rate is above 91%, can absorb UV 330nm. And the mechanical properties and chemical stability is good, is widely used in the domestic and foreign absorption of ultraviolet rays of white quality lenses.

First: cutting, leveling

Optical glass materials for the lump material, needs to feed into a lump of material, and the appearance of leveling, preparing for the first step.

Second way: cutting

The leveling good glass slice

Third: chamfer edge

According to customer requirements chamfering chamfering, trimming.

Fourth way: fine grinding, double side polishing

The semi finished machine on the fine grinding, double-sided polishing, is a double-sided smooth to achieve the customer's finish requirements.

Fifth way: inspection, packaging

Finished out, after the inspection, the qualified products inspection package, storage. The final package sent by express.

Optical glass used in the manufacture of lenses, mirrors, mirrors, windows and other glass materials for optical instruments or mechanical systems. Including colorless optical glass (usually referred to as optical glass), colored optical glass, radiation resistant optical glass, radiation proof glass and optical quartz glass, etc.. Optical glass has a high degree of transparency, chemical and physical properties (structure and properties), with a high degree of uniformity, with a specific and accurate optical constants.

The difference between optical glass and other glass is that it is a part of the optical system and must satisfy the requirements of optical imaging. Therefore, the determination of the quality of optical glass also includes some special and more stringent indicators.