Zoom security monitoring camera lens

Abstract

The invention discloses a zoom security monitoring camera lens which comprises a first lens to a twelfth lens. Each of the first to twelfth lenses comprises an object side surface and an image side surface; the first lens has a negative refractive index; the second lens has a negative refractive index; the third lens has a negative refractive index; the fourth lens has a positive refractive index; the first to fourth lenses form a fixed lens group; the fifth lens has a positive refractive index; the sixth lens has a positive refractive index; the seventh lens has a negative refractive index; the eighth lens has a positive refractive index; the ninth lens has a positive refractive index; the tenth lens has a negative refractive index; the eleventh lens has a positive refractive index; the twelfth lens has a negative refractive index; the fifth lens to the twelfth lens form a zoom lens group; the optical imaging camera lens is only provided with the above twelve lenses with refractive indexes. The camera lens has an ultra-high-definition imaging effect, and imaging pictures of different focal segments are clear and uniform; blue and purple edge color difference does not occur in the pictures, and high image color reducibility is achieved; and the imaging picture brightness is uniform.

Description

Technical field [0001] The present invention relates to the field of lens, and more particularly to a zoom security monitoring lens. Background technique [0002] Security surveillance lens generally refers to monitoring camera monitoring lenses, and security monitoring lenses are widely used due to high sensitivity, high resistance, distortion, small size, long life, and resistance to earth. There are still many deficiencies in existing security surveillance lenses, such as: more fixed focus lenses, difficult to apply a variety of mass spacing and different field of view; due to cost and process restrictions, resolution is generally limited to 1080p, can not meet Increasing resolution demand; multi-visible-infrared incompocol design to correct the color difference of the ultraviolet spectrum area, then use non-whilar switches to perform optical path compensation, which causes the lens optical structural design to consider ICR placement, increase The difficulty of the optical opt...

AI Technical Summary

Problems solved by technology

There are still many deficiencies in the existing security monitoring lenses, such as: most of them are fixed-focus lenses, which are difficult to meet the requirements of multiple object distances and different field of view frames at the same time; due to cost and process limitations, the resolution is generally limited to 1080P, which cannot meet Increasing resolution requirements; Visible-infrared non-confocal design is often used to correct the chromatic aberration in the ultraviolet spectral region, and then use unequal thickness switching film to compensate the infrared optical path, which leads to the design of the optical structure of the lens. ICR placement needs to be considered, increasing The difficulty of optical optimization of the lens and the complexity of the structure; pure glass spherical surface design is mostly used, limited by the shortcomings and deficiencies of the spherical surface in aberration correction. Both degree and uniformity have a great influence

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