APOchromatic): it can be imagined that if a material with the change of the refractive index of the value of the wavelength can be arbitrarily controlled, then we can design a completely without the color of the lens. It is a pity that the dispersion of the material can not be controlled arbitrarily. We step back to imagine, if we can be divided into the visible spectrum of blue - green, green - red two ranges, and these two ranges can be applied to eliminate color difference technology, two levels of spectrum can be basically eliminated.

However, after calculation shows: if the green and red light to eliminate color, then the blue color will become very big; if the blue light and green color, the red color will become great. Theoretical calculation for apochromatic find a way, if the low refractive convex lens manufacturing rate of blue light emitting materials of green part of relative color exactly and manufacturing a concave lens of high refractive rate part of the material relative color the same, then the realization of blue and red achromatic after, green color just eliminate.

This theory points out that the realization of apochromatic right way, is to look for a kind of special optical materials. Its blue to red light relative dispersion should is very low, and blue to green part of the relative dispersion should be very high and a high dispersion material with the same. Fluorite is such a kind of special material, the dispersion is very low (Abbe number up to 95.3) and relative partial dispersion and many optical glass close. Fluorite (CaF2, molecular formula CaF2) refractive index is relatively low ND=1.4339, slightly soluble in water (0.0016g/100g water), processing and poor chemical stability, but due to its excellent achromatic properties, making it become a kind of precious optical materials. Fluorite was first used only in microscope, since the fluorite crystallization process to achieve, the high long focal lens in fluorite is almost an indispensable material.

Because of the fluorite is expensive, difficult processing, the optical company has spared no effort to the search of fluorite substitutes, fluoro crown glass is one of the. The company called AD glass, ED glass, UD glass, often is this kind of substitute.

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.

1, smelting

Continuous smelting process with single crucible batch melting method and tank furnace (see kiln). 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.

2, molding

Optical glass molding method of 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.

3, annealing

In order to eliminate the internal stress of the glass and improve the uniformity of the optical system, a strict annealing system must be made.

4, inspection

The indexes include: optical constants, optical uniformity, stress birefringence, stripes, bubbles, etc..

Optical glass for a long time use do not use shall be placed in dry and ventilated place, ban placed in damp places, it is best placed in the cabinet moisture custody, prevent "frosted" appears on the surface.

Optical glass is a kind of inorganic material, which is used to transmit light through the refraction, reflection, transmission, or change the intensity or spectral distribution of light through the absorption. Stable optical properties and high optical uniformity.

Today, you can explain some kinds of optical glass according to the optical properties:

1, colorless optical glass. The optical constants have specific requirements, with the visible area of high transmittance, no choice of absorption and color characteristics. Abbe number size according to the crown and flint glass, all kings and according to the refraction rate level is divided into several kinds and according to the refraction rate size are arranged in order. Used as a telescope, microscope, camera, lens, prism, mirror, etc..

2, anti radiation optical glass. Larger absorption capacity, high lead glass and CaO-B2O2 system glass on high energy irradiation, the former can prevent the gamma ray and X-ray radiation, which can be slow neutron and thermal neutron absorption, mainly used as the shielding and peeped through the window materials in nuclear industry, medical field, and so on.

3, colored optical glass. Filter glass. Ultraviolet, visible and infrared region specific wavelength selective absorption and permeation, according to the spectral characteristics of points for selective absorption, cut-off and neutral grey 3 class; according to the coloring mechanism are divided into 3 types of coloring ion, metal colloid coloring and selenium and sulfur compounds coloring, mainly for manufacturing filter.

4, optical quartz glass. Using silica as the main ingredient, with characteristics of high temperature resistance, thermal expansion coefficient is low, high mechanical strength, chemical properties good for manufacturing of various bands through the special requirements of the prism, lens, window, mirror, etc..

5, ultraviolet and infrared optical glass. In the ultraviolet or infrared wave band with a specific optical constant and high transmittance, used as ultraviolet, infrared optical instrument or as a window material.

6, radiation resistant optical glass. Under a certain gamma ray and X ray irradiation, the visible area transmission rate is less, and the variety and grade are the same as the colorless optical glass, which is used for the manufacture of optical instruments and peep window under high energy irradiation.

Hai'an Huihong optoelectronics specializing in the production of a variety of filters, filter, coating color filter, narrowband filter, through the filter, infrared filter, IR filter, long wave pass filter and short wave pass filter, neutral density filters, narrow-band IR filter, light, mirror and other optical instruments. Sink rainbow production filter can only make need light through the filter, usually made of colored glass, filter contains color temperature and filter. Filter is also called the color temperature of the filter, mounted between optical system lens and a dichroic prism (three CCD cameras), and in terms of a single CCD machine, then put between the lens and a single CCD. It is the effect of the same object have the same color in different lighting conditions of color picture. Color filter is a kind of filter, its main function is to make the correct color deviation, color reduction to normal. Filter is used to change the intensity of the incident light, color is used for color correction, it can 3200K different light source color temperature conversion requirements for the camera, the captured image true color, avoid color deviation.

Color video camera is usually the more pieces of different color filter insert on a disk, camera can be according to the color temperature of light source and the light intensity of toggle disk, in order to obtain the suitable range. Home video camera is usually not equipped with filters, mainly through the circuit to adapt to different light sources.

Color is the accessory microscope, reasonable selection can improve the imaging quality. The filter has the following main functions:

1 with achromatic lens using yellow green color, can make the maximum aberration correction.

2. The apochromatic objective, the blue color, because the wavelength of blue than the yellow green short, so it can improve the lens resolution.

3 weaken the intensity of the light source. New type of microscope in addition to commonly used yellow green color filter and one or a few gray neutral density filters, used to weaken the intensity of incident light and does not change the other characteristics of incident light. This kind of filter best using Inconel alloy in glass forming vapor deposition membrane, according to the demand made with different light through rate of the filter, the transmission rate can reached 80% to 0.001% range.

(1) only the largest wounds: L = = 1/4 * D.

(2) also has the largest scars and smaller wounds: L '= sigma (W/N) [L] = 1/2 * * D.

(3) only a small scar: l '= sigma [(W/N) * l] is less than or equal to D allows that l' = total length of scar conversion w = scar width n = requirements scar specifications L = the scar length. The surface of the lens straight mirror

(4): EX.1 specifications for 80/50, lens diameter 40mm lens, the lens surface inspection, found scars are as follows: No. 80 8mm L =8mm 'scar is less than or equal to 1/4 * 40=10mm=, EX.2: Specifications for acceptance check lens lens surface 80/50 lens diameter 8.2mm, found as follows: 80 8mm scar scar, 60 scar 4mm, 40 scars 6mm L' = (80/80) * 8 + (60/80) * 4 + (40/80) x 6=14mm = [1/2] = > x 40=20mm acceptance EX.3: Specifications for the 80/50, the lens diameter of 40mm lens, the lens surface inspection, found as follows: 60 8mm scar scar, No. 40 6mm 20 8mm scar scar, L = (60/80) * 8 + (40/80) * 6 + (20/80) x 8=10mm = 40mm = L = > acceptance "(60/80) * 8 + (40/80) * 6 + (20/80) x 8=10mm = 40mm = >.

(5) the standard of the reflecting film after coating is determined according to the specification of the scar / bright spot of the drawing.

Optical glass is with high purity silicon, boron and sodium, potassium, zinc, lead, magnesium, calcium, barium oxide according to a particular formula mixed, melted in a platinum crucible temperature, ultrasonic stir, to bubble, followed by a long slow cooling, in order to avoid glass block produce internal stress. After the cooling of the glass block, must be measured by optical instruments, test purity, transparency, uniformity, refractive index and dispersion rate is close to the specification.

To produce high quality optical glass must be cold processing, polishing, cleaning and so on, and finally to get high-quality optical glass lenses. Here we mainly talk about the cleaning process of optical glass.

So what are the factors that affect the cleaning of optical glass? Look at the following specific:

A, the key technology of cleaning process: optical glass after cleaning can reach the surface without leaving any oil, stains, the surface is smooth, the water film intact!

B, factors affecting the quality of optical glass after cleaning and the corresponding solutions:

(1) of the glass quality spiral sending feeder and polluted, mainly for surface moldy, bubble, scratches, etc., in the mechanical processing, such as: grinding, smear test, measurement of stress, man-made pollution situation is not a;

(2) the selection of cleaning agent to its dynamic and temperature, water quality, we use non ODS aqueous alkaline cleaning agent, mainly by water, alkali, surfactant, anti rust material composition, chemical formula C3H8, with side chains of cyclic olefin, with strong oil soluble ability; features: low toxic, non flammable, cleaning and low cost characteristics;

(3) solution concentration directly affect the cleaning degree of the size; usually cleaning solution pH value of general between 8.5-12. If the pH value is greater than the box type transformer station 10, the side of surfactant to weaken. When the pH value is greater than 12, side cleanliness decline.

(4) solution temperature and soaking time also with the high temperature circulating fan like effect the decontamination efficiency; when the temperature rises, the reaction velocity of the solution are also rising, viscosity decrease of pollutants for pollutants from, but the solution stability decreased. If the temperature is too high, it will produce a pattern on the edge of the glass.

(5) in the cleaning process, attention must be paid to the use of pure water or deionized water, if the use of side water hard water is very difficult to remove grease from one glass and water contain of Ca, Na + impurity will form a layer of white mist film on the glass surface after drying, pollution of glass;

(6) optical glass after cleaning, rinsing is required. After rinsing the cleanliness, except with the cleaner rinsing and cleaning liquid in the cleaning agent concentration, and how much of a rinsing step, size of rinsing water supply, temperature and cycling use of water is clean.

(7) the degree of cleanliness of the cleaning environment;

(8) after cleaning and drying process and temperature should be as far as possible to ensure that the vertical glass, the glass ceramic packing column, avoid the drying of glass along the watermark; oven temperature control at about 70 degrees, the time in about 20 minutes. If the temperature is too high, it will produce a pattern on the edge of the glass.

Hai Hui Huihong photoelectric professional production, processing a variety of specifications of coloured optical glass, colorless optical glass, filter, filter, insulating glass, yellow glass, orange glass, green glass, red glass through glass visible light, neutral gray glass, quartz glass, through red glass, near infrared glass, band pass filter and UV glass through UV black glass, and so on more than 100 types of products. The optical lenses produced by our company are suitable for medical, aerospace, military, civil and other fields.

Materials: all kinds of flint glass, UV quartz, quartz infrared.

Fluoride glass

Focal length: + 5mm - + 1000mm + 1%

Outer circle: 200mm - 5mm + 0.1mm

Central thickness tolerance: + 0.02mm

Center deviation: 3-5

Surface accuracy: /2@

Surface quality: 40/20

Effective diameter: 90%

Coating: our company can according to customer demand for optical lenses are coated, many kinds of specifications, different radius, substrate material of spherical lens, flat convex lens, flat concave lens, a biconvex lens, biconcave lens, meniscus lens, spherical reflector ordinary spherical mirror. Warmly welcome people from all walks of life come to discuss the purchase.