Wide-working-distance large-aperture wide-angle TOF lens

Abstract

The invention discloses a wide-working-distance large-aperture wide-angle TOF lens comprising a first lens L1, a second lens L2, an aperture diaphragm STO, a third lens L3, a fourth lens L4, a fifth lens L5 and a narrow-band optical filter BPF which are sequentially arranged from an object plane to an image plane, wherein the first lens L1 is a meniscus glass spherical lens with negative focal power, the second lens L2 is a meniscus glass spherical lens with negative focal power, the third lens L3 is a biconvex glass aspheric lens with positive focal power, the fourth lens L4 is a meniscus glass aspheric lens with positive focal power, the fifth lens L5 is a meniscus glass spherical lens with positive focal power, and the effective focal lengths of the lenses are reasonably designed. The lens can correct off-axis aberration in a large aperture design, reduce vignetting, improve edge view field illumination, reduce optical total length, improve imaging quality, realize large view field angle, wide working distance and high illumination, and is stable in working performance at high and low temperatures.

Description

technical field [0001] The invention belongs to the technical field of optical lenses, and in particular relates to a wide working distance, large aperture and wide angle TOF lens. Background technique [0002] In recent years, TOF (Time Of Flight) depth sensor technology has become one of the three mainstream solutions in the field of 3D depth vision due to the advantages of small size, low error, direct output of depth data and strong anti-interference. TOF depth sensing technology is also playing a role in industries such as mobile phone lenses, VR / AR gesture interaction, smart security, automotive electronics ADAS, and factory automation. At the same time, the demand for depth cameras used with TOF depth sensors is increasingly prominent. This type of depth camera usually works in the near-infrared band, with a central wavelength of 850nm or 940nm, and requires a large aperture (F / #≤1.2), high illumination, large field of view, and small size. [0003] The small TOF le...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to address the above problems, to propose a wide working distance and large aperture wide-angle TOF lens, which overcomes the problems of the existing TOF lens such as small field of view, low illumination, and small depth of field of large aperture lenses. In the design, the off-axis aberration is corrected, vignetting is reduced, the illumination of the peripheral field of view is improved, the total optical length is reduced, the imaging quality is improved, a wide working distance is realized, and the high and low temperature performance is stable

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