Long-focus lens

Abstract

The invention discloses a telephoto lens, comprising a lens frame and an end cover; the lens frame is internally provided with a meniscus convex lens, a double concave lens, a first meniscus concave lens, a double convex lens and a second meniscus concave lens in sequence from an object-near side to an object-far side; the contact surfaces of the first meniscus concave lens and the double convex lens are glued; a spacer is arranged between the double concave lens and the first meniscus concave lens; and a spacer is arranged between the double convex lens and the second meniscus concave lens. As the telephoto lens adopts the structure, the ray longitude has the characteristics of small viewing holes, no vignetting in the viewing field, large collecting amount of daylight, no defocusing andgood night viewing effect; and the focus reaches 12 mm, and the resolution is more than million pixels. The lens designed according to the proposal adopts an optical path with an included angle of zero degree between the principal ray and the optical axis, therefore, the optical distortion is small and the utilization rate of energy is high; and the lens is designed to be one third circle, has high resolution and excellent night viewing effect.

Description

technical field [0001] The invention belongs to the technical field of image acquisition equipment, and in particular relates to a telephoto lens. Background technique [0002] In terms of long-distance image acquisition equipment, the combination of lenses inside the lens determines the image acquisition effect, but at present, some video image acquisition equipment adjusts the lens to achieve high pixels, but the amount of light is often insufficient to meet the needs of day and night. Image acquisition requirements; while the amount of lighting meets the requirements and meets the requirements of day and night, the pixels are often too low to achieve clarity. Contents of the invention [0003] The invention provides a telephoto lens, which has high resolution, can meet the requirement of acquiring images at night, and has good night vision effect. [0004] A telephoto lens, comprising a picture frame and an end cap, wherein a meniscus convex lens, a biconcave lens, a f...

AI Technical Summary

Problems solved by technology

[0002] In terms of long-distance image acquisition equipment, the combination of lenses inside the lens determines the image acquisition effect, but at present, some video image acquisition equipment adjusts the lens to achieve high pixels, but the amount of light is often insufficient to meet the needs of day and night. Image acquisition requirements; while the amount of lighting meets the requirements and meets the requirements of day and night, the pixels are often too low to achieve the degree of clarity

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