Small optical lens

Abstract

The invention discloses a small optical lens. The optical lens comprises a lens cone. A first lens, a second lens, a third lens, a fourth lens, a fifth lens and an optical filter are sequentially arranged in a cavity of the lens cone from object space to image space, wherein the first lens is a crescent-shaped spherical glass lens with negative power; the second lens is a crescent-shaped aspherical plastic lens with negative power; the third lens is a crescent-shaped aspherical plastic lens with positive power, and the concave surface of the third lens faces towards the image space; the fourth lens is a drum-shaped aspherical plastic lens with positive power; the fifth lens is a crescent-shaped aspherical plastic plus lens, and the concave surface of the fifth lens faces towards the object space. The small optical lens is ultra-wide in field and small in size.

Description

【Technical field】 [0001] The invention relates to an optical lens, in particular to a small ultra-wide-angle optical lens applied to monitoring and vehicles. 【Background technique】 [0002] The currently used monitoring and vehicle lenses generally have such shortcomings: the field of view angle is not large enough, and the external dimensions are large. The current mainstream monitoring and vehicle-mounted lenses in the market are mainly lenses with a field of view angle lower than 120 degrees. The overall range of the captured image is so small that it takes two or even several more lenses to achieve the effect of large-scale monitoring; and Surveillance and vehicle-mounted lenses are large in shape, with an outer diameter generally greater than 17mm, and lenses used for CCD photosensitive film are generally longer, and the total length of the optical system is greater than 17mm, which makes them appear bulky when used in monitoring and vehicle-mounted lenses. 【Content o...

AI Technical Summary

Problems solved by technology

[0002] The currently used monitoring and vehicle lenses generally have such shortcomings: the field of view angle is not large enough, and the overall size is large

The current mainstream monitoring and vehicle-mounted lenses in the market are mainly lenses with a field of view angle lower than 120 degrees. The overall range of the captured image is so small that it takes two or even several more lenses to achieve the effect of large-scale monitoring; and The appearance of monitoring and vehicle-mounted lenses is too large, and the outer diameter is generally greater than 17mm, and the lens used for CCD photosensitive film is generally relatively long, and the total length of the optical system is greater than 17mm, which is relatively large when used in monitoring and vehicle-mounted lenses

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