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Endoscopes have a series of high-resolution optical glass rod lenses. The endoscopes can be forward viewing (0 degrees) or angled (10–120 degrees) to allow visualization out of the axis of the telescope and increase the FOV by rotating the instrument. Under the condition of high refractive index, some optical components can achieve short focal length. Therefore, the micro lens becomes an ideal choice in the field of high precision applications. Because of the ultra-small size of this kind of lens(outer diameter 0.5mm-5mm, length: 0.5mm-30mm), either in spherical/round or rod shape, micro lens or ultra-small lens often requires special processing technology, unique production know-how and special optical fixture, etc.

Lenses are classified by the curvature of the two optical surfaces. A lens is biconvex if both surfaces are convex. If both surfaces have the same radius of curvature, the lens is equiconvex. If one of the surfaces is flat, and the other one of the surface is convex, the lens is plano-convex lens. The plano convex lens is the most common type of lens element. It can be used to focus, collect, and collimate light. A plano convex lens is useful as a simple imaging lens for systems where image quality requirement is not too critical.

Ruby material is grown in the factory by melting ultra-pure Al2O3 at temperatures above 2000 deg. degrees Celsius to create a single crystal. This hard material can be polished to a very good surface finish. We offer sapphire and ruby balls in a variety of sizes down to 0.15 mm in diameter. Typical applications: fiber optic connectors, flow meters, rotameter, barcode readers, gemstone bearings. low friction number, high hardness, corrosion resistance, low coefficient of thermal expansion, high compressive strength, and performance that can meet the requirements of instrumentation bearings. High rotational accuracy, good sensitivity, long service life.

The Fresnel lens reduces the amount of material required compared to a conventional lens by dividing the lens into a set of concentric annular sections. An ideal Fresnel lens would have an infinite number of sections. In each section, the overall thickness is decreased compared to an equivalent simple lens. This effectively divides the continuous surface of a standard lens into a set of surfaces of the same curvature, with stepwise discontinuities between them. In some lenses, the curved surfaces are replaced with flat surfaces, with a different angle in each section. Such a lens can be regarded as an array of prisms arranged in a circular fashion, with steeper prisms on the edges, and a flat or slightly convex center. In the first (and largest) Fresnel lenses, each section was actually a separate prism. 'Single-piece' Fresnel lenses were later produced, being used for automobile headlamps, brake, parking, and turn signal lenses, and so on. In modern times, computer-controlled milling equipment (CNC) or 3-D printers might be used to manufacture more complex lenses. Fresnel lens design allows a substantial reduction in thickness (and thus mass and volume of material), at the expense of reducing the imaging quality of the lens, which is why precise imaging applications such as photography usually still use larger conventional lenses. Fresnel lenses are usually made of glass or plastic; their size varies from large (old historical lighthouses, meter size) to medium (book-reading aids, OHP view graph projectors) to small (TLR/SLR camera screens, micro-optics). In many cases they are very thin and flat, almost flexible, with thicknesses in the 1 to 5 mm (1⁄32 to 3⁄16 in) range. Most modern Fresnel lenses consist only of refractive elements. Lighthouse lenses, however, tend to include both refracting and reflecting elements, the latter being outside the metal rings seen in the photographs. While the inner elements are sections of refractive lenses, the outer elements are reflecting prisms, each of which performs two refractions and one total internal reflection, avoiding the light loss that occurs in reflection from a silvered mirror. Application Imaging A plastic Fresnel lens sold as a TV-screen enlarging device The Fresnel lens used in the Sinclair FTV1 portable CRT TV, which enlarges the vertical aspect of the display only Fresnel lenses are used as simple hand-held magnifiers. They are also used to correct several visual disorders, including ocular-motility disorders such as strabismus.[14] Fresnel lenses have been used to increase the visual size of CRT displays in pocket televisions, notably the Sinclair TV80. They are also used in traffic lights. Fresnel lenses are used in left-hand-drive European lorries entering the UK and Republic of Ireland (and vice versa, right-hand-drive Irish and British trucks entering mainland Europe) to overcome the blind spots caused by the driver operating the lorry while sitting on the wrong side of the cab relative to the side of the road the car is on. They attach to the passenger-side window. Another automobile application of a Fresnel lens is a rear view enhancer, as the wide view angle of a lens attached to the rear window permits examining the scene behind a vehicle, particularly a tall or bluff-tailed one, more effectively than a rear-view mirror alone. Multi-focal Fresnel lenses are also used as a part of retina identification cameras, where they provide multiple in- and out-of-focus images of a fixation target inside the camera. For virtually all users, at least one of the images will be in focus, thus allowing correct eye alignment. Fresnel lenses have also been used in the field of popular entertainment. The British rock artist Peter Gabriel made use of them in his early solo live performances to magnify the size of his head, in contrast to the rest of his body, for dramatic and comic effect. In the Terry Gilliam film Brazil, plastic Fresnel screens appear ostensibly as magnifiers for the small CRT monitors used throughout the offices of the Ministry of Information. However, they occasionally appear between the actors and the camera, distorting the scale and composition of the scene to humorous effect. The Pixar movie Wall-E features a Fresnel lens in the scenes where the protagonist watches the musical Hello, Dolly! magnified on an iPod. Photography Canon and Nikon have used Fresnel lenses to reduce the size of telephoto lenses. Photographic lenses that include Fresnel elements can be much shorter than corresponding conventional lens design. Nikon calls the technology Phase Fresnel. The Polaroid SX-70 camera used a Fresnel reflector as part of its viewing system. View and large format cameras can utilize a Fresnel lens in conjunction with the ground glass, to increase the perceived brightness of the image projected by a lens onto the ground glass, thus aiding in adjusting focus and composition. Illumination Inchkeith lighthouse lens and drive mechanism High-quality glass Fresnel lenses were used in lighthouses, where they were considered state of the art in the late 19th and through the middle of the 20th centuries; most lighthouses have now retired glass Fresnel lenses from service and replaced them with much less expensive and more durable aerobeacons, which themselves often contain plastic Fresnel lenses.[citation needed] Lighthouse Fresnel lens systems typically include extra annular prismatic elements, arrayed in faceted domes above and below the central planar Fresnel, in order to catch all light emitted from the light source. The light path through these elements can include an internal reflection, rather than the simple refraction in the planar Fresnel element. These lenses conferred many practical benefits upon the designers, builders, and users of lighthouses and their illumination. Among other things, smaller lenses could fit into more compact spaces. Greater light transmission over longer distances, and varied patterns, made it possible to triangulate a position.[citation needed] Perhaps the most widespread use of Fresnel lenses, for a time, occurred in automobile headlamps, where they can shape the roughly parallel beam from the parabolic reflector to meet requirements for dipped and main-beam patterns, often both in the same headlamp unit (such as the European H4 design). For reasons of economy, weight, and impact resistance, newer cars have dispensed with glass Fresnel lenses, using multifaceted reflectors with plain polycarbonate lenses. However, Fresnel lenses continue in wide use in automobile tail, marker, and reversing lights. Glass Fresnel lenses also are used in lighting instruments for theatre and motion pictures (see Fresnel lantern); such instruments are often called simply Fresnels. The entire instrument consists of a metal housing, a reflector, a lamp assembly, and a Fresnel lens. Many Fresnel instruments allow the lamp to be moved relative to the lens' focal point, to increase or decrease the size of the light beam. As a result, they are very flexible, and can often produce a beam as narrow as 7° or as wide as 70°. The Fresnel lens produces a very soft-edged beam, so is often used as a wash light. A holder in front of the lens can hold a colored plastic film (gel) to tint the light or wire screens or frosted plastic to diffuse it. The Fresnel lens is useful in the making of motion pictures not only because of its ability to focus the beam brighter than a typical lens, but also because the light is a relatively consistent intensity across the entire width of the beam of light. Optical landing system on US Navy aircraft carrier USS Dwight D. Eisenhower Aircraft carriers and naval air stations typically use Fresnel lenses in their optical landing systems. The "meatball" light aids the pilot in maintaining proper glide slope for the landing. In the center are amber and red lights composed of Fresnel lenses. Although the lights are always on, the angle of the lens from the pilot's point of view determines the color and position of the visible light. If the lights appear above the green horizontal bar, the pilot is too high. If it is below, the pilot is too low, and if the lights are red, the pilot is very low.[citation needed Projection The use of Fresnel lenses for image projection reduces image quality, so they tend to occur only where quality is not critical or where the bulk of a solid lens would be prohibitive. Cheap Fresnel lenses can be stamped or molded of transparent plastic and are used in overhead projectors and projection televisions. Fresnel lenses of different focal lengths (one collimator, and one collector) are used in commercial and DIY projection. The collimator lens has the lower focal length and is placed closer to the light source, and the collector lens, which focuses the light into the triplet lens, is placed after the projection image (an active matrix LCD panel in LCD projectors). Fresnel lenses are also used as collimators in overhead projectors. Solar power Since plastic Fresnel lenses can be made larger than glass lenses, as well as being much cheaper and lighter, they are used to concentrate sunlight for heating in solar cookers, in solar forges, and in solar collectors used to heat water for domestic use. They can also be used to generate steam or to power a Stirling engine. Fresnel lenses can concentrate sunlight onto solar cells with a ratio of almost 500:1.[19] This allows the active solar-cell surface to be reduced, lowering cost and allowing the use of more efficient cells that would otherwise be too expensive. In the early 21st century, Fresnel reflectors began to be used in concentrating solar power (CSP) plants to concentrate solar energy. Fresnel lenses can be used to sinter sand, allowing 3D printing in glass.

Sapphire (molecular formula Al2O3) single crystal is an excellent multifunctional material. It is resistant to high temperature, good thermal conductivity, high hardness, infrared transmission and good chemical stability. It is widely used in many fields of industry, national defense and scientific research (such as high temperature resistant infrared windows, etc.). It is also a widely used single crystal substrate material and is the preferred substrate for the current blue, violet and white light emitting diode (LED) and blue laser (LD) industries (need to first epitaxy GaN film on sapphire substrate), as well as an important superconducting thin film substrate. In addition to Y-series, La-series and other high-temperature superconducting films, it can also be used to grow new practical MgB2 (magnesium diboride) superconducting films (usually single-crystal substrates are subject to chemical corrosion during the production of MgB2 films). For sapphire product, we have sapphire window, sapphire lens, sapphire bearing, sapphire rod, sapphire prism etc.

Fresnel lens used in the projection system, its role is to collimate light and focus light. Fresnel lens will be the light source to retrieve the beam light source mobilization for parallel light, apparently improve the brightness of the panel around, eliminating the sun spot effect. Eliminate the sun spot effect, so as to improve the overall brightness uniformity. General Fresnel lens and the rest of the components (such as column mirrors) together. Fresnel lens used in the advantages of the projection system: after focusing or mobilization of light collimation so as to increase the brightness of the body appears. If the collimator is eliminated, light will be lost through the panel, appearing in the obvious hot spot effect, increase the brightness of the screen around. Similarly, on the other side of the LCD screen, it is necessary to collect the light from the panel to the projection lens. Realpoo Optics can customize different size, shape and focal length of Fresnel lens for projector according to customer's demand. Fresnel lens for projector to improve the resolution, clarity, brightness, etc. of the projector screen. In order to improve the resolution, clarity, brightness, etc. of the projector screen, we rationalize the thread pitch and tooth shape, and use an eccentric lens focusing objective lens to raise the screen and increase the range of keystone correction. The projector can achieve a good viewing effect whether it is suspended or placed on the desktop.

A cylindrical lens is a lens which focuses light into a line instead of a point, as a spherical lens would. The curved face or faces of a cylindrical lens are sections of a cylinder, and focus the image passing through it into a line parallel to the intersection of the surface of the lens and a plane tangent to it. The lens compresses the image in the direction perpendicular to this line, and leaves it unaltered in the direction parallel to it (in the tangent plane). Uses 1. In a light sheet microscope, a cylindrical lens is placed in front of the illumination objective to create the light sheet used for imaging. 2. Cylindrical lenses are used in optical spectrometers. 3. Cylindrical lenses are used in holography. 4. Doublet cylinder lens system is used in optical coherence tomography. 5. Cylinder lenses are used in many laser applications also. Cylindrical lens can be used to create a laser line. Doublet cylinder lens is used to make laser sheets and circularize elliptical beams from laser diodes

What is EORI? EORI is the abbreviation of "Economic Operators Registration and Identification". The EORI number is the "European Union Economic Registration and Identification Number". It is a unique number in the entire European Union and is issued to import and export companies or personnel by the customs of EU member states. What is the EORI number used for? The EORI system was introduced on July 1, 2009. Customs and other authorities use EORI numbers to monitor and track goods entering and leaving the EU. When the company needs to provide the EORI number to the relevant customs before the goods arrive at any port in the EU, or before leaving the port; When companies need to import goods, samples, equipment, office supplies and other items from non-EU countries, they need to provide an EORI number. Which companies need EORI? Any company or individual in the EU must obtain an EORI number from its national customs authority before starting customs business in the EU. Economic operators outside the EU need to submit customs declarations, entry or export summary declarations, and they need to be assigned an EORI number. If the company does business in multiple EU countries, it needs to provide this number for each country. The EORI number can be verified online. Why do we need EORI? In order to improve the efficiency of security checks, the European Commission proposes to introduce a unique identification number for each economy in the EU, the so-called "Economy Business Registration and Identification" (EORI) number. This unique identification number must be used in all electronic communications with customs and/or other government departments and agencies, which will enable EU authorities to identify economic operators and their activities throughout the EU. This distinguishes EORI from VAT numbers.

The optical fused silica glass windows produced by our factory can withstand high temperature and high pressure, and are mainly used in special light sources, optical instruments, optoelectronics, military industry, metallurgy, semiconductors, optical communications and other fields. It can test temperature: 1200 degrees, softening temperature: 1730 degrees, the specific parameters are as follows. 1. JGS1 (Far Ultraviolet Optical Quartz Glass) It is optical quartz glass melted with high-purity hydrogen and oxygen. It has excellent ultraviolet transmission performance, especially in the short-wave ultraviolet region, its transmission performance is far better than all other glasses, the transmission rate at 185mμ can reach 90%, and it is an excellent optical material in the range of 185-2500mμ. . 2. JGS2 (ultraviolet optical quartz glass) It is optical quartz glass melted with hydrogen and oxygen. It is a good material that penetrates the 220-2500mμ band. 3. JGS3: (Infrared Quartz Glass) It is an optical material with high infrared transmittance, a transmittance of over 85%, and its application wavelength range of 260-3500mμ.

Sapphire belongs to the corundum group of minerals. It is a common coordination oxide crystal. It belongs to the trigonal crystal system. The crystal space group is R3c. The main chemical composition is AI2O3. The material has a mode hardness of up to 9, second only to diamond. Sapphire has good chemical stability, low preparation cost and mature technology, so it has become the main substrate material of GaN-based optoelectronic devices. In addition, it has good dielectric and mechanical properties, and is widely used in flat panel displays, high-efficiency solid-state devices, photoelectric lighting and other fields. Silicon substrates are also widely used as substrate materials. The silicon surface is arranged in a hexagonal shape and the vertical temperature gradient is large, which is conducive to the stable growth of single crystals and is widely used. However, the biggest technical difficulty in fabricating GaN-based LEDs on a silicon substrate is lattice mismatch and thermal mismatch. The lattice mismatch between silicon and gallium nitride is several times that of silicon nitride, which can cause cracking problems. The semiconductor field usually uses SiC as a sinking material. The thermal conductivity of silicon nitride is higher than that of sapphire. It is easier to dissipate heat than sapphire and has better antistatic ability. However, the cost of silicon nitride is much higher than that of sapphire, and the cost of commercial production high. Although silicon nitride substrates can also be industrialized, they are expensive and have no universal application. Other sinking materials such as GaN, ZnO, etc. are still in the research and development stage, and there is still a long way to go from industrialization. When selecting a substrate, it is necessary to consider the matching of the substrate material and the epitaxial material. The defect density of the substrate is required to be low, the chemical properties are stable, the temperature is small, it is not easy to corrode, and it cannot chemically react with the epitaxial film, and consider the actual situation. Manufacturing costs in production. The sapphire substrate has good chemical stability, high temperature resistance, high mechanical strength, good heat dissipation under small current conditions, no visible light absorption, moderate price, mature manufacturing technology, and can be commercialized. Application of Sapphire Substrate in SOS Field SOS (Silicon on sapphire) is a SOI (Silicon on Insulator) technology used in the manufacture of integrated circuit CMOS devices. It is a process of heteroepitaxially epitaxial a layer of silicon film on a sapphire substrate. The thickness of the silicon film is generally lower than 0.6μm. The crystal orientation of the sapphire substrate of the general LED is C-plane (0,0,0,1), while the crystal orientation of the sapphire substrate used in the SOS technology is R-plane (1, -1, 0, 2). Since the lattice mismatch between the sapphire lattice and the silicon lattice reaches 12.5%, to form a silicon layer with fewer defects and good performance, R-plane(1,-1,0,2) crystal orientation must be used. sapphire.

Imaging Like TV-screen enlarging device, simple hand-held magnifiers, traffic lights, stage light, rear view enhancer, etc. Projection Used in overhead projectors and projection televisions. Fresnel lenses of different focal lengths (one collimator, and one collector) are used in commercial and DIY projection. The collimator lens has the lower focal length and is placed closer to the light source, and the collector lens, which focuses the light into the triplet lens, is placed after the projection image (an active matrix LCD panel in LCD projectors). Fresnel lenses are also used as collimators in overhead projectors. Photography Canon and Nikon have used Fresnel lenses to reduce the size of telephoto lenses. Photographic lenses that include Fresnel elements can be much shorter than corresponding conventional lens design. Solar Power Since plastic Fresnel lenses can be made larger than glass lenses, as well as being much cheaper and lighter, they are used to concentrate sunlight for heating in solar cookers, in solar forges, and in solar collectors used to heat water for domestic use. They can also be used to generate steam or to power a Stirling engine. Fresnel lenses can concentrate sunlight onto solar cells with a ratio of almost 500:1.This allows the active solar-cell surface to be reduced, lowering cost and allowing the use of more efficient cells that would otherwise be too expensive.

Generally speaking, a concave grating spectrometer is a kind of diffraction grating. It is used in a specific environment, so it also has special parameter performance, including five points as follows: 1. The concave grating spectrometer is operated and analyzed by Ocean Optics' Spectrasuite spectrum operating software, and can be used on Windows, Macintosh, and Linux operating platforms. It is also compatible with Ocean Optics' OmniDriver and SeaBreeze software development platform. 2. The spectrometer has the characteristics of high light transmittance, lower stray light, and good thermal stability, and can be used for absorption and fluorescence measurement of liquids and solids. Torus visible band spectrometer (360nm-825nm), stray light level: at 400nm, about 0.015%, lower than the plane grating and other miniature fiber spectrometers. 3. Flat-field optical design and holographic concave grating for light dispersion: the concave surface of the concave grating spectrometer grating is used for light reflection and convergence; the grating line is used for light dispersion; the ring design of the grating is used for aberration correction to improve Diffraction efficiency. 4. The grating instrument has high optical resolution (<1.6nmFWHM, 25um slit) and excellent thermal stability (within the range of 0-50℃, the wavelength drift is smaller, and the peak shape remains basically the same). 5. And this type of grating spectrometer can be controlled interactively with the computer through the USB interface, and the slits, filters and other accessories can be changed according to customer needs to optimize the configuration; it can also be used in conjunction with the microscope through the C-mount interface. Together with other optical accessories of Ocean Optics, it makes your measurement more convenient and flexible.

The convex lens is made according to the principle of light refraction. It has a unique shape. The thickness of the middle part is much thicker than that of the edge part. Compared with the concave lens, it is not only the opposite in appearance, but also has two focal lengths at one focal length. It can distinguish between the real and the real in the room, the size of the object can be distinguished at the double focal length, and it also has the characteristic of concentrating light. As the most common item in life, convex lens is widely used in various fields of life, and it brings great convenience to our lives. Convex lens in the glasses In the modern life of the economic high-speed Karma station, while people enjoy the convenience brought by high technology, they also bring some harm to our body. Glasses are one of them. We will find that glasses have become life today. A daily necessities that can be seen everywhere in China. In the face of work, entertainment, and age, our eyes are often overwhelmed and have varying degrees of damage, but due to different reasons, the use of glasses will be different. From the perspective of the type of cause, the eyes can be divided into myopia. Unlike hyperopia, myopia needs a concave lens, while hyperopia needs a convex lens; depending on the degree of damage, there will be different degrees, which correspond to lenses of different thicknesses. According to the needs of real life, the convex lens used by the hyperopic eye shrinks into a positively magnified image. It maps the selected objects to the retina of the observer's eyeball through the refraction of the convex lens, so that patients with presbyopia can clearly observe distant objects. Convex lens in microscope In order to be able to observe the appearance of objects beyond the scope of the naked eye, people will use a high-power microscope to observe and record. The function of the microscope is to magnify objects. Microscopes with different magnifications will observe objects of different sizes. From the first microscope developed by Galileo to the current digital microscope, advances in science and technology have overcome the bottleneck of microscope magnification. Observed objects can reach the limit, Chengdu, which provides scientists with a key tool for studying the miniature world, and provides a key to the study of the miniature world. As a key component of the microscope, the convex lens is installed on the side close to the object and the side close to the eye in the microscope. They are named objective lens and eyepiece respectively. The principle is also the magnification characteristic of the convex lens. When the observing object is fixed at the center of the stage, due to the small focal length of the objective lens, the observing object is between one and two times the focal length of the eyepiece, and the object becomes an upside-down magnified virtual image, and the virtual image is just within the focal length of the eyepiece. , The eyepiece continues to upside-down magnification of the virtual image. After two upside-down magnifications, the observation object on the stage has been magnified forward, and the outer contour of the object can be clearly observed. Convex lens in magnifying glass With the development of economy, simple magnifying glass has been gradually replaced by high-tech electronic magnifying glass, and gradually become intelligent, so that magnifying glass can perfectly meet people's needs. But whether it is an electronic magnifying glass or the most common magnifying glass, the key component used is still a convex lens, and the principle of a convex lens is naturally applicable to all magnifying glasses. A magnifying glass is a widely used tool in real life. It can magnify small objects, but due to its short focal length, it can only magnify things within a limited distance. And this distance is generally less than one focal length, and the enlarged image is an upright enlarged virtual image. As the distance between the magnifying glass and the object is closer, the magnification effect is better. The reason is that the distance is smaller than the focal length of the magnifying glass when viewed at close range. On the contrary, the farther the magnifying glass is from the object, the worse the magnification effect will be. In some industries, in order to be able to clearly observe the surface condition of small objects, such as observing small parts of circuit boards, jewelry identification, observing small fonts, and dentists detecting tooth problems. Convex lens in projector Projectors have become necessary items for major companies, corporate governments, education, catering and other industries. In order to be able to magnify the items that everyone pays attention to for many people to watch, people often choose to use a projector. The principle of the projector is to place the object between one and two times the focal length of the convex lens, and the convex lens can be one to two times. The inverted virtual image can be magnified between multiple focal lengths, and then the inverted virtual image is reflected into an upright virtual image and projected on the screen by using the reflection principle of the plane mirror to achieve the purpose of magnification. In order to achieve the most ideal projection effect, because the stage is fixed, the convex lens can only be moved to change the distance between the convex lens and the object, thereby improving the projection effect. Within the distance of one to two times the focal length, the closer the convex lens is to the stage, the more obvious the magnification effect will be. Conversely, the longer the distance, the worse the magnification effect will be. Convex lens has the function of being able to magnify and is used in various industries in real life. In order to show you the wide applicability of convex lenses, this article has different focal length angles based on the thickness of convex lenses, and summarizes the three applications of convex lenses in life, namely the applications in hyperopia glasses, microscopes, and magnifiers.

Realpoo Optics broke through the technical difficulties and manufactured the N-SF11 larg ball lens with a diameter of 100mm.

In the instrumentation industry, sapphire/ruby bearings are widely used due to their simple structure, low manufacturing cost and long service life. In recent years, with its high-speed development, it has gradually been widely used in ultra-high-speed rotating machinery. Main technical specification Products Name : Sapphire bearings ,Rubby bearings Materials Optical sapphire(Al2O3), Rubby Diameter Range (mm) : 2.00~300.00 Diameter Tolerance (mm) : ±0.02 Processing requirements : According to customer requirements Surface Quality : 80/50,60/40,40/20 Parallelism (arcminutes) : ≤3.5 Orientation of Axis : According to customer requirements Production capacity : 10,000~100,000 pcs / Month

Class Description Application example Class I Power is less than 0.4mW, basically no harm to eyes DVD player,Laser curvature measuring instrument for ophthalmology Class II Power is 0.4mW~1mW. Usually, lasers below 1mw can cause dizziness and thinking. If you close your eyes to protect it, you can usually eliminate the symptoms. Do not observe directly in the beam, and do not directly illuminate other people`s eyes with a laser less than 1mw. Avoid using telescope equipment to observe Class II lasers. Laser scanner, Laser pointer Class III A Power is 1mW~5mW, avoid observing the laser with a telescope, which may increase the risk. Like Class II, do not observe directly in the beam, and do not use Class III A laser to directly illuminate the eyes of others. Laser level meter Class III B Power is 5mW~500mW. It is dangerous to observe directly in the beam, and do not use Class III B laser to directly irradiate the eyes of others, as this will be even more dangerous. Laser level meter,laser range finer Class IV Power is more than 500mW. Reflected or radiated light beams may cause eye or skin damage. Laser welding machine,laser marking machine

Lens maintenance 1. Loosen two nuts by hand, then draw the drawer of laser protective lens. 2. Note: seal the drawer outlet with protective film. 3.Put the drawer( including laser protective lens) in a clean place. 4. Tear off the protective film and place the maintained lenses in a drawer and insert them into the laser head. 5. Tighten two nuts by hand. Lens assembling 1.Fixing ring 2.Laser Protective Lens 3.Seal ring 4.Drawer