CN113376800B - Wide-working-distance large-aperture wide-angle TOF lens - Google Patents
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- 230000005499 meniscus Effects 0.000 claims abstract description 24
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- 238000005286 illumination Methods 0.000 abstract description 16
- 230000003287 optical effect Effects 0.000 abstract description 8
- 238000003384 imaging method Methods 0.000 abstract description 7
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
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- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
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Abstract
The invention discloses a wide-working-distance large-aperture wide-angle TOF lens, which comprises a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a fifth lens L5 and a narrow-band filter BPF which are arranged in sequence from an object plane to an image plane, wherein: the first lens L1 is a negative power meniscus glass spherical lens, the second lens L2 is a negative power meniscus glass spherical lens, the third lens L3 is a positive power biconvex glass aspherical lens, the fourth lens L4 is a positive power meniscus glass aspherical lens, the fifth lens L5 is a positive power meniscus glass spherical lens, and the effective focal length of each lens is designed reasonably. The lens can correct off-axis aberration in large-aperture design, reduce vignetting, improve the illumination of the edge field, reduce the optical total length, improve the imaging quality, and realize large field angle, wide working distance, high illumination and stable working performance at high and low temperature.
Description
Technical Field
The invention belongs to the technical field of optical lenses, and particularly relates to a wide-working-distance large-aperture wide-angle TOF lens.
Background
In recent years, the tof (time Of flight) depth sensor technology has become one Of three main schemes in the field Of 3D depth vision by virtue Of the advantages Of small volume, low error, direct output Of depth data, strong interference resistance and the like. TOF depth sensing technology also shows the hands of a large amount of things in industries such as mobile phone lens, VR/AR gesture interaction, intelligent security, automotive electronics ADAS, factory automation, and the like. Meanwhile, the demand for depth cameras used in conjunction with TOF depth sensors is increasingly prominent. The depth camera generally works in a near infrared band, has a central wavelength of 850nm or 940nm, and has the characteristics of large aperture (F/# ≦ 1.2), high illumination, large field angle, small size and the like.
The small TOF lens disclosed in patent No. CN112099193A adopts a 4G2P architecture and a 1/4inch sensor, the maximum image height is phi 4.5mm, the relative illumination level can only reach about 45%, and the maximum diagonal field angle calculated according to the imaging formula (y = ftanU) is 80 °; the lens disclosed in patent No. CN209167661U has a 2G3P structure, and the diagonal angle of view can only reach about 90 °, and it is difficult to achieve a smaller lens when a larger angle of view is obtained. Meanwhile, considering that the larger the aperture (the smaller the Fno) and the smaller the depth of field (working distance), the lens needs to be optimized sufficiently to meet the requirement of a larger working distance, so that it is necessary to provide a small TOF lens with a large aperture, high illumination, a large field angle and a wide working distance.
Disclosure of Invention
The invention aims to solve the problems, provides a wide-working-distance large-aperture wide-angle TOF lens, solves the problems of small field angle, low illumination and small depth of field of the large-aperture lens of the conventional TOF lens, can correct off-axis aberration in large-aperture design, reduces vignetting, improves the illumination of an edge field, reduces the optical total length, improves the imaging quality, realizes a wide working distance and has stable high and low temperature performance.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention provides a wide-working-distance large-aperture wide-angle TOF lens which comprises a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a fifth lens L5 and a narrow-band filter BPF, wherein the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are sequentially arranged from an object plane to an image plane, and the narrow-band filter BPF comprises:
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 following conditions are satisfied:
-10mm< f1< -7mm；-9mm< f2 <-7mm；5mm< f3 <9mm；
14mm< f4< 30mm；10mm< f5 <16mm
wherein f1 is the effective focal length of the first lens L1, f2 is the effective focal length of the second lens L2, f3 is the effective focal length of the third lens L3, f4 is the effective focal length of the fourth lens L4, and f5 is the effective focal length of the fifth lens L5.
Preferably, the wide-working-distance large-aperture wide-angle TOF lens further satisfies the following condition:
1.7< n1< 1.95；1.4< n2< 1.6；1.4< n3< 1.6；1.7< n4< 1.95；1.4< n5< 1.6
wherein n1 is the d-light refractive index of the first lens L1, n2 is the d-light refractive index of the second lens L2, n3 is the d-light refractive index of the third lens L3, and n4 is the d-light refractive index of the fourth lens L4; n5 is the d-light refractive index of the fifth lens L5.
Preferably, the third lens L3 and the fourth lens L4 are molded glass lenses.
Preferably, the light-passing surface of each lens is plated with a broadband antireflection film with the transmittance of 99.3-99.7% at the wavelength of 400-1100 nm.
Preferably, the object surface side of the narrow-band filter BPF is plated with a band-pass cut-off film, the image surface side is plated with a broadband antireflection film, the band-pass cut-off film meets the condition that the light incidence angle range is 0-30 degrees, the transmittance T is greater than or equal to 93 percent when the wavelength range is 940 +/-15 nm or 850 +/-15 nm, the transmittance T of the rest wavelengths is less than 1 percent, and the wavelength deviation is less than 25nm when the light is obliquely emitted at 30 degrees.
Preferably, the working waveband of the narrow-band filter BPF is 835 nm-865 nm or 925 nm-955 nm near infrared waveband.
Preferably, the working distance of the wide-working-distance large-aperture wide-angle TOF lens is 0.55-5 m.
Compared with the prior art, the invention has the beneficial effects that:
1) five full-glass lenses are adopted, the parameters of each lens are optimized, the positions of the diaphragms and the air intervals among parts are reasonably set, the good imaging effect of the near infrared band is achieved (when the wavelength is 140lp/mm, the MTF of the full field is greater than 0.3), and the high-low temperature performance of the full-glass lens is more stable (the working temperature is 10-70 ℃);
2) the lens adopts two aspheric lenses, so that off-axis aberration can be corrected in large-aperture design, vignetting is reduced, image quality is improved, edge illumination is improved, the optical total length is reduced, meanwhile, the MTF defocusing performance is good, wide working distance is realized, the working distance is 0.55-5 m, and refocusing is not needed;
3) the lens has a large field angle and relative brightness (the full field is larger than 100 degrees, and the relative illumination is larger than or equal to 80 percent), can realize large-angle detection and obtain more accurate three-dimensional data, and has high reduction degree on the space size and the brightness information of captured information.
Drawings
FIG. 1 is a schematic view of an overall structure of a lens according to the present invention;
FIG. 2 is a lens sequence diagram according to a first embodiment of the present invention;
FIG. 3 is a graph of illuminance according to the first embodiment of the present invention;
FIG. 4 is a lens MTF graph according to a first embodiment of the present invention;
fig. 5 is a MTF curve diagram of a lens of a first embodiment of the present invention at a 0.55m working distance;
fig. 6 is a MTF curve diagram of a lens with a working distance of 5m according to a first embodiment of the present invention;
FIG. 7 is a chart of the through focus MTF at 10 ℃ of the lens according to the first embodiment of the present invention;
FIG. 8 is a chart of the MTF of the lens at 70 ℃ according to the first embodiment of the present invention;
FIG. 9 is a lens dot-sequence diagram according to a second embodiment of the present invention;
FIG. 10 is a graph of illuminance for the second embodiment of the present invention;
FIG. 11 is a lens MTF graph according to a second embodiment of the present invention;
FIG. 12 is a defocus plot of a second embodiment of the present invention at a 0.55m working distance;
fig. 13 is a defocus graph at a working distance of 5m of the lens according to the second embodiment of the present invention;
FIG. 14 is a chart of the through focus MTF at 10 ℃ of the lens according to the second embodiment of the present invention;
fig. 15 is a through focus MTF graph at 70 ℃ for the lens according to the second embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It is to be noted that, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
As shown in fig. 1 to 15, a wide-working-distance large-aperture wide-angle TOF lens is composed of a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a fifth lens L5 and a narrow-band filter BPF, which are sequentially arranged from an object plane to an image plane, wherein:
the first lens L1 is a negative power meniscus glass spherical lens, the second lens L2 is a negative power meniscus glass spherical lens, the third lens L3 is a positive power double convex glass aspherical lens, the fourth lens L4 is a positive power meniscus glass aspherical lens, the fifth lens L5 is a meniscus glass spherical lens with a positive power, and the following conditions are satisfied:
-10mm< f1< -7mm；-9mm< f2 <-7mm；5mm< f3 <9mm；
14mm< f4<30mm；10mm< f5 <16mm
wherein f1 is the effective focal length of the first lens L1, f2 is the effective focal length of the second lens L2, f3 is the effective focal length of the third lens L3, f4 is the effective focal length of the fourth lens L4, and f5 is the effective focal length of the fifth lens L5.
The lens adopts five full-glass lenses, realizes good imaging effect of near infrared band by optimizing the shape, focal length, aperture diaphragm position and air interval among parts, and has more stable high and low temperature performance; the lens adopts two aspheric lenses, so that off-axis aberration can be corrected in large aperture design, vignetting is reduced, image quality is improved, edge illumination is improved, the total optical length is reduced, the MTF defocusing performance is better, refocusing is not needed, and wide working distance is facilitated to realize; the lens has a large field angle and relative brightness, can realize large-angle detection and obtain more accurate three-dimensional data, and has high reduction degree on the space size and the brightness information of captured information.
In one embodiment, each lens in the system has an easily-processed shape by selecting optical glass materials with different refractive indexes, and meanwhile, the focal power is reasonably distributed, so that various aberrations are easily corrected, and good image quality is realized; the selected materials are common materials, and the cost is low.
The wide-working-distance large-aperture wide-angle TOF lens further meets the following conditions:
1.7< n1< 1.95；1.4< n2< 1.6；1.4< n3< 1.6；1.7< n4< 1.95；1.4< n5< 1.6
wherein n1 is the d-light refractive index of the first lens L1, n2 is the d-light refractive index of the second lens L2, n3 is the d-light refractive index of the third lens L3, and n4 is the d-light refractive index of the fourth lens L4; n5 is the d-light refractive index of the fifth lens L5.
In one embodiment, for facilitating compression molding, reducing processing difficulty and reducing production cost, the third lens L3 and the fourth lens L4 are molded glass lenses.
In one embodiment, in order to increase the optical transmittance and make the image received by the sensor have uniformity and higher brightness, the light-passing surface of each lens is coated with a broadband antireflection film with 99.3-99.7% transmittance at wavelengths of 400-1100 nm.
In one embodiment, the wavelength range is precisely controlled to obtain accurate measurement data, considering that the TOF lens, when used with a camera, obtains depth information of an object by calculating the time difference of the round-trip light waves. Therefore, the image surface side of the narrow-band filter BPF is plated with a broadband antireflection film, the object surface side is plated with a band-pass cut-off film, the band-pass cut-off film meets the condition that the light incident angle range is 0-30 degrees, the transmittance T is more than or equal to 93 percent when the wavelength range is 940 +/-15 nm or 850 +/-15 nm, the rest wavelengths T are less than 1 percent, and the wavelength deviation is less than 25nm when the light is obliquely emitted at 30 degrees. The light wave can be realized in each incident angle range, and the transmittance meets the conditions.
In one embodiment, the operating band of the narrow band filter BPF is 835 nm-865 nm or 925 nm-955 nm near infrared band.
In one embodiment, the working distance of the wide-working-distance large-aperture wide-angle TOF lens is 0.55m-5 m.
Example 1:
as shown in fig. 1, five full glass lenses of 2GM3G were used, the first lens L1 was a negative power meniscus glass spherical lens, the second lens L2 was a negative power meniscus glass spherical lens, the third lens L3 was a positive power biconvex molded glass aspheric lens, the fourth lens L4 was a positive power meniscus molded glass aspheric lens, and the fifth lens L5 was a positive power meniscus glass spherical lens.
The wide-working-distance large-aperture wide-angle TOF lens in the embodiment meets the requirements of table 1:
TABLE 1
| 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 |
The aspheric coefficients satisfy the following equation:
wherein z is the aspheric sagittal height, c is the aspheric paraxial curvature, y is the lens caliber, k is the conic coefficient,
is 4-order aspheric surface coefficient,
Is aspheric coefficient of 6 times,
Is an 8-order aspheric surface coefficient,
Is a 10-order aspheric surface coefficient,
Is a 12-degree aspheric coefficient.
Specifically, the values of the radii and the thicknesses of the lens surfaces in this example are shown in table 2, and the aspherical parameters are shown in table 3.
TABLE 2 radius value and thickness of surface of each lens
| Surface number | Surface type | Radius/mm | Thickness/mm |
| Object surface | Infinite number of elements | 1000 | |
| 1 | Spherical surface | 11.3 | 1.876 |
| 2 | Spherical surface | 3.735 | 3.063 |
| 3 | Spherical surface | 27.652 | 0.687 |
| 4 | Spherical surface | 3.813 | 3.53 |
| STO | Aperture diaphragm | Infinite number of elements | 0.04 |
| 6 | Aspherical surface | 7.087 | 2.665 |
| 7 | Aspherical surface | -7.087 | 1.774 |
| 8 | Aspherical surface | -48.88 | 1.173 |
| 9 | Aspherical surface | -10.836 | 0.075 |
| 10 | Spherical surface | -35.979 | 2.210 |
| 11 | Spherical surface | -6.184 | 4.669 |
| 12 | Spherical surface | Infinite number of elements | 0.7 |
| 13 | Spherical surface | Infinite number of elements | 0.674 |
| Image plane | Spherical surface | Infinite number of elements | - |
TABLE 3 aspheric parameters
| |
6 | 7 | 8 | 9 |
| k | 0.133 | -1.765 | 44.951 | 3.807 |
 |
-7.012E-4 | -6.501E-4 | -4.009E-4 | 1.684E-3 |
 |
-1.763E-5 | -4.424E-5 | -5.345E-5 | -2.737E-5 |
 |
-2.105E-6 | -1.291E-6 | -4.325E-7 | 4.230E-6 |
 |
2.725E-7 | 2.297E-7 | 2.634E-7 | -3.458E-8 |
 |
-3.041E-9 | 3.312E-9 | -4.995E-9 | 1.247E-9 |
According to the data in tables 1, 2, and 3, the lens of this embodiment satisfies the following parameters: the total field angle is more than 100 degrees, the diaphragm F #, the aperture F #, the relative illumination RI of the marginal field angle is more than or equal to 80 percent, and the relative illumination RI of the sensor size is as follows: 1/3.6inch, resolution: more than 300 ten thousand pixels, working distance: 0.55m-5m (no need for refocusing). As can be seen from the dot sequence diagram in FIG. 2, the size of the image dots obtained by each visual field of the lens of the embodiment is uniform, and the average image spot RMS RADIUS is less than 2.3 μm; the relative illumination shown in fig. 3 reaches more than 80%, and the full-view resolution is 140lp/mm >0.3 by combining with the MTF curve chart of the optical system shown in fig. 4, so that the imaging quality is high, and the resolution requirement of the TOF sensor in the market at present can be fully met. FIGS. 5 and 6 are graphs of MTF at 0.55m and 5m respectively, and within 0.85 field of view, the MTF >0.3 resolution requirement at 140lp/mm can be satisfied. FIGS. 7 and 8 are graphs of MTF of defocusing at 10 ℃ and 70 ℃ respectively, the defocusing amount is less than 3 μm, and the embodiment works in the temperature range of 10 ℃ to 70 ℃, and the resolution is good.
Example 2:
as shown in fig. 1, five full glass lenses of 2GM3G were used, the first lens L1 was a negative power meniscus glass spherical lens, the second lens L2 was a negative power meniscus glass spherical lens, the third lens L3 was a positive power biconvex molded glass aspheric lens, the fourth lens L4 was a positive power meniscus molded glass aspheric lens, and the fifth lens L5 was a positive power meniscus glass spherical lens.
The wide-working-distance large-aperture wide-angle TOF lens in the embodiment meets the following table 4:
TABLE 4
| 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 |
The aspheric coefficients satisfy the following equation:
wherein z is the aspheric sagittal height, c is the aspheric paraxial curvature, y is the lens caliber, k is the conic coefficient,
is 4-order aspheric surface coefficient,
Is a 6-order aspheric surface coefficient,
Is an 8-order aspheric surface coefficient,
Is a 10-order aspheric surface coefficient,
Is a 12-degree aspheric coefficient.
Specifically, the values of the radii and the thicknesses of the lens surfaces in this example are shown in table 5, and the aspherical parameters are shown in table 6.
TABLE 5 radius value, thickness of surface of each lens
| Surface number | Surface type | Radius/mm | Thickness/mm |
| Article surface | Infinite number of elements | Infinite number of elements | 1000 |
| 1 | Spherical surface | 10.174 | 1.687 |
| 2 | Spherical surface | 3.776 | 2.682 |
| 3 | Spherical surface | 22.346 | 0.718 |
| 4 | Spherical surface | 3.924 | 4.297 |
| STO | Aperture diaphragm | Unlimited in size | 0.125 |
| 6 | Aspherical surface | 6.710 | 2.592 |
| 7 | Aspherical surface | -11.220 | 1.426 |
| 8 | Aspherical surface | -25.566 | 0.942 |
| 9 | Aspherical surface | -13.706 | 0.790 |
| 10 | Spherical surface | 124.610 | 2.032 |
| 11 | Spherical surface | -6.098 | 3.712 |
| 12 | Spherical surface | Infinite number of elements | 0.7 |
| 13 | Spherical surface | Unlimited in size | 1.999 |
| Image plane | Spherical surface | Infinite number of elements | - |
TABLE 6 aspheric parameters
| |
6 | 7 | 8 | 9 |
| k | 0.619 | -1.291 | 48 | 12.059 |
 |
-7.377E-4 | -9.034E-4 | -7.697E-4 | 1.74E-3 |
 |
-1.611E-5 | -7.555E-5 | -6.913E-5 | -9.896E-6 |
 |
-3.012E-6 | 3.108E-6 | -1.399E-6 | 2.728E-6 |
 |
3.281E-7 | -3.306E-7 | 8.074E-6 | 4.014 |
 |
0 | 0 | 0 | 0 |
According to the data in tables 4, 5, and 6, the lens of this embodiment satisfies the following parameters: the total field angle is more than 100 degrees, the diaphragm F #, the aperture F #, the relative illumination RI of the marginal field angle is more than or equal to 80 percent, and the relative illumination RI of the sensor size is as follows: 1/3.6inch, resolution: over 300 ten thousand pixels, working distance: 0.55m-5m (no need for refocusing). As can be seen from the dot sequence diagram of FIG. 9, the image dots obtained from each field of view of the lens in this embodiment are uniform in size, and the average image spot RMS RADIUS is less than 2.2 μm; the relative illumination shown in fig. 10 reaches more than 80%, and in combination with the MTF curve chart of the optical system shown in fig. 11, the full-field resolution is 140lp/mm >0.3, the imaging quality is high, and the resolution requirement of the TOF sensor in the market at present can be fully met. FIGS. 12 and 13 are graphs of MTF at 0.55m and 5m for working distances, respectively, that satisfy the MTF >0.3 resolution requirements at 140 lp/mm. FIGS. 14 and 15 are defocus MTF graphs at 10 ℃ and 70 ℃ respectively, the defocus amount is less than 3 μm, and the embodiment works in the temperature range of 10 ℃ to 70 ℃, and the resolution is good.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express the more specific and detailed embodiments described in the present application, but not should be understood as the limitation of the invention claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. The utility model provides a wide working distance big light ring wide angle TOF lens which characterized in that: the wide-working-distance large-aperture wide-angle TOF lens consists of a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a fifth lens L5 and a narrow-band 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 spherical lens with positive focal power, the fourth lens L4 is a meniscus glass spherical lens with positive focal power, and the fifth lens L5 is a meniscus glass spherical lens with positive focal power, and satisfies the following conditions:
-10mm< f1< -7 mm；-9 mm < f2 <-7 mm；5 mm < f3 <9 mm；
14 mm < f4< 30 mm；10 mm < f5 <16 mm
wherein f1 is an effective focal length of the first lens L1, f2 is an effective focal length of the second lens L2, f3 is an effective focal length of the third lens L3, f4 is an effective focal length of the fourth lens L4, and f5 is an effective focal length of the fifth lens L5.
2. The wide-working-distance large-aperture wide-angle TOF lens of claim 1, wherein: the wide-working-distance large-aperture wide-angle TOF lens further meets the following conditions:
1.7< n1< 1.95；1.4< n2< 1.6；1.4< n3< 1.6；1.7< n4< 1.95；1.4< n5< 1.6
wherein n1 is a d-optical refractive index of the first lens L1, n2 is a d-optical refractive index of the second lens L2, n3 is a d-optical refractive index of the third lens L3, n4 is a d-optical refractive index of the fourth lens L4, and n5 is a d-optical refractive index of the fifth lens L5.
3. The wide-working-distance large-aperture wide-angle TOF lens of claim 2, wherein: the third lens L3 and the fourth lens L4 are molded glass lenses.
4. The wide-working-distance large-aperture wide-angle TOF lens of claim 1, wherein: the light-passing surface of each lens is plated with a broadband antireflection film with the transmittance of 99.3-99.7% at the wavelength of 400-1100 nm.
5. The wide-working-distance large-aperture wide-angle TOF lens of claim 1, wherein: the narrow-band filter BPF is characterized in that a band-pass cut-off film is plated on the object surface side and a broadband antireflection film is plated on the image surface side, the band-pass cut-off film meets the condition that the incident angle range of light is 0-30 degrees, the transmittance T is more than or equal to 93 percent when the wavelength range is 940 +/-15 nm or 850 +/-15 nm, the transmittance T of the rest wavelengths is less than 1 percent, and the wavelength deviation is less than 25nm when the light is obliquely emitted at 30 degrees.
6. The wide-working-distance large-aperture wide-angle TOF lens of claim 5, wherein: the working waveband of the narrow-band filter BPF is 835 nm-865 nm or 925 nm-955 nm near infrared waveband.
7. The wide-working-distance large-aperture wide-angle TOF lens of claim 1, wherein: the working distance of the wide-working-distance large-aperture wide-angle TOF lens is 0.55-5 m.
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