Optical lens size characteristics and function on optical instruments
The uneven stress distribution of the optical lens leads to uneven refractive index, which deforms the light wave surface after passing through the glass, and the image quality will also deteriorate. When the stress of the optical lens is high, it is easy to cause the glass to burst during the optical processing;
Even when the stress is not high, it is easy to make the aperture worse, the refractive index inside the optical lens is locally uneven, and the shape is like a linear stripe, similar to a cylindrical lens, causing light The variation of the direction is mainly caused by the different components of the optical glass during the melting process.
During the manufacturing and use of optical lens elements, the ability of the polished surface to resist the action of various corrosive media is called the chemical stability of optical glass. Optical lenses have glass and The dual characteristics of ceramics, and like ceramic optical lenses, glass-ceramics are composed of crystals, that is to say, its atomic arrangement is regular. Optical lenses have a large difference in molding temperature and decomposition temperature, low melt viscosity, and stable size. Features: It can be molded by compression molding, and it is also widely used in injection molding, but it is more brittle than other optical plastics, so it is easy to crack. When cutting the gate, you should pay attention to prevent it from cracking. It can also be machined with general metal or wood processing tools. Processing, such as drilling, sawing, cutting, etc.
The optical lens has advanced technology, reliable quality and short production cycle. During the cleaning process, any sticky matter, even nail marks or oil drops, will increase the absorption rate of the lens and reduce the service life. The addition of the optical lens to the laser wavelength absorption will cause uneven heating and cause the reflection of the lens. The design of the refractive index lens changes. When the laser wavelength is transmitted or reflected from the high-absorption lens, the laser power is unevenly diffused and the center temperature of the lens is high. The edge temperature is low, and this kind of change is called the lens effect optically.
In the process of cleaning the optical lens, the only purpose is to remove the contaminants of the lens, and not to cause further pollution and damage to the lens. When holding the optical system of the optical lens by hand, you must wear finger cots or medical gloves regardless of pickling, assembly, and installation. Always follow the application for cleaning the lens and pay attention to accidents. During the cleaning process, you can only use delineation. Regular materials, such as lens cleaning paper for optics, cotton swabs, and reagent grade ethanol.
Pickling, disassembling, and setting shortcuts to any lens will cause the life of the lens to be shortened, and the laser lens may even become loose forever. Therefore, we must use ordinary common sense to prevent the lens from being contaminated by other reasons, such as preventing moisture, smoke, dust and so on. After confirming that a certain lens is polluted, we need to blow the lens with the ear-washing ball until there are no particles on the outside of the optical lens. Do not blow with the mouth.
The optical lens after coating is tested by a sealed light photometer to test its spectral curve to calculate whether its reflectance, transmittance, etc. can meet the technical requirements. Optical glass is used High-purity silicon, boron, sodium, potassium, zinc, lead, magnesium, calcium, barium and other oxides are mixed according to a specific formula, melted in a platinum crucible at high temperature, stirred evenly with ultrasound to remove bubbles, and then slowly cooled down over a long period of time , So as to avoid internal stress in the glass block.
High-power laser lens group optical lens, in general, is made of optical glass. The lens is mainly used in optical instruments. Optical lens is used to make lens glass, which is ordinary window. The lump on the glass or wine bottle, the optical lens plays an important role in the optical instrument, such as telescope, microscope, magnifying glass, etc., the glass block after cooling must be measured by optical instrument to check the purity, transparency, uniformity and refractive index And dispersion rate.
Because of the different usage policies and environments of various optical glass wool wheels, the requirements of the process and the transparency of light are also different. The process of coating is In order to meet these requirements, make corresponding adjustments to the light path, etc. The electrons emitted by the electron gun are affected by the Lentz force of the Luo reflector under the action of the magnetic field and hit the film material to make the film material evaporate and adhere more evenly. On the glass polishing wheel optical lens.
Optical lenses can be used to make spherical lenses and cylindrical lenses. The curved surface of spherical lenses is part of the spherical surface, which can be divided into convex spherical lenses or concave spherical lenses according to the convergence or separation of parallel rays. lens. Convex spherical lenses are used to correct hyperopia, presbyopia or aphakia, and concave spherical lenses are used to correct myopia. The curved surface of the cylindrical lens is a part of the cylinder. The axis of the cylindrical lens is parallel to the cylinder. There is no refractive power in the direction of the axis. The direction perpendicular to the axis has the largest refractive power. It is divided into convex cylindrical lenses or concave cylindrical lenses, which are used to correct hyperopia or myopia astigmatism. . Optical mirrors use lenses, prisms, contact lenses, intraocular lenses, etc. to correct vision, eliminate visual fatigue, and protect or treat eyes.