Bi-Concave Lenses

Introduction of Bi-Concave Lenses

A biconcave lens is a lens with a concave surface on both sides, with the same curvature radius on both sides. Bi-concave lenses disperse collimated light and converge the input light. In the optical system, they can be used to expand the beams, project the light and increase the focal length of the optical system to minimize spherical aberration, coma and distortion under unit conjugate ratio. They are used in laser beam expanders, optical character readers, viewers and projection systems.

The line connecting the centers of curvature of the two sides is called the main axis, and the point O in the center is called the optical center. Light rays passing through the optical center are not refracted no matter where they come from. The light beam parallel to the main axis is refracted on the concave lens and then diverges in all directions. The extension line against its divergent direction will all be at a point F on the same side as the light source, and the refracted light will be emitted from point F, which is called the virtual focus. . There is one on each side of the lens. A biconcave lens is also called a diverging lens. The focal length of a concave lens is the distance from the focal point to the center of the lens. The larger the radius of the lens, the longer the focal length. If it is a thin lens, the focal lengths on both sides are equal. When used in an optically sparse medium, it can diverge the incident beam, so it is also called a diverging lens. It is also called a negative lens because of its negative focal length. For thin concave lenses, the imaging formula, lateral magnification formula, and sign laws are the same as for convex lenses.

Spherical lens features

Spherical lens processing types:

Plano-convex lenses, double-convex lenses, plano-concave lenses, double-concave lenses, positive meniscus lenses, negative meniscus lenses, flat lenses, single-cap lenses, double-convex double-step lenses

A biconcave lens is similar to a plano-concave lens. The focal length is negative, but the parallel incident light diverges outward. The two sides of the biconcave lens have equal radii of curvature. The geometric mapping of biconcave lenses is the same as that of convex lenses. There are also two straight lines from the top of the object: one is parallel to the main optical axis, which is deflected into divergent rays after passing through the biconcave lens, and the refracted rays return to the main focus in the opposite direction; the other passes through the optical center point of the lens, these two The lines intersect at a point, which is the image of the object.

Production Capacity Sheet

Application

Glass lenses have a wide distribution of refractive index and dispersion, and have good adaptability to temperature and environment. They are widely used in high-end optical lenses, such as digital cameras, security, automotive, optical communications, laser projection, medical, unmanned machine, AR, etc.

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