Aspherical lens technology is a very important technology for millions of HD lenses. It is also an important guarantee for high-definition lens. The traditional spherical lens has a congenital defect of spherical aberration, which brings about an insurmountable spot phenomenon and greatly affects the imaging quality. With an aspherical lens, the light can be accurately focused at a point by refraction of the light through a high-order surface. In addition, the aspheric lens can also simplify the optical structure of the lens. Such as FUJINO (Fujineng) million HD lens products to fully use high-definition optical design for broadcast television, an aspherical lens can complete several lens functions.

Because the use of a piece of aspherical lens can replace a group of spherical lenses, so that the optical structure of the camera lens is relatively simplified, so that it is easy to obtain a larger optical aperture in the optical path and mechanical structure. Moreover, the aspherical lens enables the light of the edge portion and the light of the central portion to be focused on the same plane through the lens, so that the entire surface of the lens can be clearly and effectively used, so that the entire lens can be properly focused, and the effective communication is relatively effective. Optical caliber becomes larger. For example, the LMVZ38A-IR (1/3"f/3~8mmF/1.0) series lens produced by KOWA Co., Ltd. The reason why the lens reaches F/1.0 is the use of aspherical lenses.

The effective aperture of an aspherical lens increases, allowing more light to be projected onto the CCD sensor surface, which also increases sensitivity. Also, because an aspherical lens can replace several sets of spherical lenses, the size of the camera lens is reduced, the weight is also reduced, and the light passes through fewer lenses, so that the light transmittance is greatly enhanced, and the image picture becomes finer. Bright. For example, KOWA's LMVZ550A-IR (1/3”f/5～50mmF/1.4) series lens uses only two aspherical lenses, which not only achieves small size, light weight, but also enhances light transmittance. Image quality.

The important feature of aspherical lenses is that they can improve the refractive index of light on the edge of the lens and make the imaging of the lens edge better. The spherical lenses, especially the high-magnification spherical lenses, are more prone to spherical aberration and image distortion, especially the barrel distortion caused by the refraction of the light at the edge of the spherical lens. When the aspheric lens is used in a high-magnification zoom lens, due to the aspheric lens The edge incident light is corrected in the opposite direction of the spherical lens distortion, thereby effectively eliminating the barrel distortion.