Ultra-short large-target-surface TOF optical lens

Abstract

The invention relates to an ultra-short large-target-surface TOF optical lens in the technical field of optical lenses, which comprises an optical lens, and an optical system is arranged in a lens barrel of the optical lens. The optical system comprises a first lens with negative focal power, a second lens with positive focal power, a diaphragm element, a third lens with positive focal power, a fourth lens with negative focal power, a fifth lens with positive focal power, a sixth lens with negative focal power, an optical filter and an image plane which are sequentially arranged from the object side to the image side in the optical axis direction. The convex surface of the first lens faces the object side, the convex surface of the second lens faces the object side, the third lens is a biconvex lens, the fourth lens is a biconcave lens surface, the fifth lens is a biconvex lens surface, and the convex surface of the sixth lens faces the image side. According to the invention, the optical lens composed of the lenses with reasonable focal power distribution and specific structural shapes is adopted, so that the large target surface image height can be achieved under a compact framework. The optical lens can correct off-axis aberration in a large aperture design, reduce vignetting, improve edge field illumination, reduce optical total length, improve imaging quality, and realize imaging effects of large target surface image height, high illumination and stable working performance at high and low temperatures.

Description

technical field [0001] The invention relates to the technical field of optical lenses, in particular to an ultra-short and large target surface TOF optical lens. Background technique [0002] TOF (Time Of Flight, distance measurement in flight) is a technical solution for depth information measurement, which consists of an infrared light projector and a receiving module. Simply put, TOF is a technology that calculates the bounce time of light / infrared to calculate the distance between the object and the signal emission source. By obtaining the distance of multiple points, the TOF sensing system can effectively shape a 3D three-dimensional model. It has been widely used in surveying and mapping, logistics, unmanned driving and other fields. The lens is an important part of the TOF depth sensor. The optical performance of the lens directly affects the imaging quality and imaging field of view. The demand for depth cameras used with TOF depth sensors is becoming more and more ...

AI Technical Summary

Problems solved by technology

But the lens image height is small, the maximum image height is φ4.5mm, which cannot match 1 / 2 chip; and the structure adopts 4G2P, the high and low temperature stability is not good; the relative illuminance is relatively low, and the corresponding illuminance of φ4.5 image height can only reach 45 %about

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