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Arc-concave Hemispheric Lens
We are a double concave optic lens spherical telescope mirror supplier in China.We are a Chinese supplier of spherical lenses with biconcave surfaces. We can provide customers with high-quality, high price products. All our customers will enjoy an unforgettable shopping experience.
What is a spherical lens?
A spherical lens is an important optical element, which is mainly made of optical glass and other materials. It is used for the coupling between optical fibers, between laser and optical fibers, and between optical fibers and detectors, or for the collimation of optical fiber beams in thin-film filtered dense wavelength division multiplexers. It plays an important role in optical systems. A spherical lens is also called a glass bead. It is a solid or hollow glass bead with a diameter of several microns to tens of microns. Its production began in the United States before World War II, and later, European countries have also begun industrial production. The varieties and specifications are increasing day by day, and the application fields involve the chemical industry, military industry, aerospace, transportation, petroleum, light industry, medical treatment, and other departments.
The manufacturing method of a spherical lens
There are two kinds of spherical lens manufacturing methods: one is to heat the glass powder to the molten state through high-temperature gas, and use the surface tension to form circular beads, including the powder method and calcination method; Or melt the glass batch and directly blow it with high-speed airflow, and the glass droplets form beads due to surface tension. Glass beads have a good surface finish, good light reflectance, directional reflectance, high impact strength, chemical stability, light bulk weight, and other characteristics.
Use of spherical lens
The spherical lens has a wide range of uses, which can be roughly divided into two categories:
①making use of the nature of the reflected light energy of the spherical lens to reflect the direction of the incident light source, making traffic signs, mixing paint for road marking, making reflective or photographic screens, etc.
②Using its spherical, glass hardness, chemical stability, and light bulk weight, it is used as the grinding medium of the metal workpiece, shot blasting and cleaning treatment, and the filling material of plastic products. Hollow glass beads have the advantages of being lightweight, high strength, and low thermal conductivity. They can be used as light thermal insulation materials in aerospace technology, marine materials, and chemical equipment.
Classification of spherical lenses
Planoconvex spherical lens is used to converge or focus light, and to collimate point light sources. When used with an infinite conjugate ratio, the best cost-effective positive lens substitute, is the collimated light incident on the convex surface. Reduce spherical aberration and near zero comae when used off-axis.
A biconvex spherical lens is used in 1:1 imaging, beam expander, and beam relay applications. Good positive lens. The ratio of virtual imaging and positive conjugate image for real objects ranges from about 0.2 to 5 (depending on wavelength). It can also be used for focusing on applications with low F values. When used in unit conjugate ratio, it behaves like an optimal single lens.
The flat-concave spherical lens is used to expand the light, increase the focal length in the optical system, or balance the aberration of other lenses in the system. A negative focal length causes the collimated incident light to diverge. When collimated light is incident on the concave side with infinite conjugate ratio, spherical aberration and coma will be reduced.
Biconcave spherical lens is used to spread light in laser beam expander, optical character reader, viewer, and projection system. Negative focal length; Form a virtual image that can be seen through the lens.
Aspheric infrared lenses (condensers) are used for light collection applications that require low-cost positive lenses. Reduce the aberration of low F value and high-throughput use. It is not recommended for imaging, precise focusing, or high-power applications.
