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A technology of working distance and aperture, applied in the field of optical lens, can solve the problems of low illumination, small field of view, small depth of field of large aperture lens, etc.
Active Publication Date: 2021-09-10
JIANGXI PHENIX OPTICS TECH CO LTD
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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 lense
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Embodiment 1
[0054] like figure 1 As shown, five 2GM3G all-glass lenses are used, the first lens L1 is a meniscus glass spherical lens with negative refractive power, the second lens L2 is a meniscus glass spherical lens with negative refractive power, and the third lens L3 is a positive refractive power. The fourth lens L4 is a meniscus molded glass aspheric lens with positive refractive power, and the fifth lens L5 is a meniscus glass spherical lens with positive refractive power.
[0055] In this embodiment, the wide working distance, large aperture, wide-angle TOF lens satisfies Table 1:
[0056] Table 1
[0057] Focal length / mm Material f1 -8.4297 H-LAF50B f2 -7.9033 H-BAK6 f3 8.0729 D-FK61 f4 21.6823 D-ZLAF85A f5 10.0952 H-ZPK5
[0058] The aspheric coefficients satisfy the following equations:
[0059]
[0060] Among them, z is the sagittal height of the aspheric surface, c is the paraxial curvature of the aspheric surface, ...
Embodiment 2
[0070] like figure 1 As shown, five 2GM3G all-glass lenses are used, the first lens L1 is a meniscus glass spherical lens with negative refractive power, the second lens L2 is a meniscus glass spherical lens with negative refractive power, and the third lens L3 is a positive refractive power. The fourth lens L4 is a meniscus molded glass aspheric lens with positive refractive power, and the fifth lens L5 is a meniscus glass spherical lens with positive refractive power.
[0071] In this embodiment, the wide working distance, large aperture, wide-angle TOF lens satisfies Table 4:
[0072] Table 4
[0073] Focal length / mm Material f1 -9.0052 TAF5 f2 -8.0622 H-ZK50 f3 8.1595 M-FCD500 f4 29.4805 M-FDS2 f5 9.9846 H-ZPK5
[0074] The aspheric coefficients satisfy the following equations:
[0075]
[0076] Among them, z is the sagittal height of the aspheric surface, c is the paraxial curvature of the aspheric surface, y is t...
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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...
Claims
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