Extra wide angle lens

Abstract

The invention discloses an extra wide angle lens which comprises an aperture slot, a lens set composed of six spherical glass lenses and a lens cone. The lens set comprises the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are coaxially arranged in sequence from the object side to the image side. The first lens and the second lens are meniscus lenses with negative focal power and protruding to the object side, the third lens and the fourth lens are double convex spherical lenses with positive focal power, and the fifth lens and the sixth lens are glued so that a lens element with positive focal power can be formed; the aperture slot is located between the third lens and the fourth lens. The view angle of the extra wide angle lens can reach the extra wide angle of 170 degrees. Machining of the lens is easy to achieve, cost is low, and the extra wide angle lens can satisfy the requirement for the high definition quality.

Description

[Technical field] [0001] The invention relates to the technical field of optical imaging, in particular to a super wide-angle lens. [Background technique] [0002] In recent years, the use of security monitoring equipment and vehicle-mounted video recording equipment has become more and more popular, such as various security monitoring cameras, car driving recorders, car reversing rearview devices, etc. Wide-angle lenses with large viewing angles are indispensable for such equipment The core component, in the wide-angle lens, the ultra-wide-angle lens with a particularly wide viewing angle can meet the needs of products such as sports DV and vehicle lenses for super-large viewing angles. In the existing technology, there are many lenses with 4G structure, which are small in structure and can achieve a wide angle of 120°~150°, but limited by optical aberration, it is difficult to achieve a super wide angle of 170°; Under the same 4G structure, a wide-angle lens with a larger...

AI Technical Summary

Problems solved by technology

In the existing technology, there are many lenses with 4G structure, which are small in structure and can achieve a wide angle of 120° to 150°, but limited by optical aberration, it is difficult to achieve a super wide angle of 170°; Under the same 4G structure, a wide-angle lens with a larger viewing angle can be produced, but the aspheric surface is difficult to process, and the glass aspheric surface processing and detection technology has not yet been generalized, and the equipment cost is high; the molded plastic aspheric surface can be mass-produced, and the cost is also low. Not high, but the performance is greatly affected by the environment. The working range is -45°C ~ +75°C, which is not ideal. The thermal difference is large, the light is small, the image plane is not clear, and it cannot meet the high-definition quality requirements of the lens.

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