CN111812828A - Infrared collimating lens and infrared lens module - Google Patents

Infrared collimating lens and infrared lens module Download PDF

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Publication number
CN111812828A
CN111812828A CN202010963733.0A CN202010963733A CN111812828A CN 111812828 A CN111812828 A CN 111812828A CN 202010963733 A CN202010963733 A CN 202010963733A CN 111812828 A CN111812828 A CN 111812828A
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lens
focal length
infrared
paraxial region
ttl
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CN111812828B (en
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张劭宇
葛丛
刘杨赞
蔡斐欣
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Shenzhen Goodix Technology Co Ltd
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Shenzhen Goodix Technology Co Ltd
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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
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G02B1/041—Lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation

Abstract

The utility model provides an infrared collimating lens, includes diaphragm, first lens, second lens and the third lens that sets gradually from the formation of image side to light source side. The first and third lenses have positive focal power, and the second lens has negative focal power. The first lens is convex in a paraxial region close to the light source side and is concave in a paraxial region close to the imaging side; the paraxial region of the second lens close to the imaging side is a concave surface; the third lens is convex in a paraxial region on the side close to the light source. At least one of the two faces of each lens is aspherical. The parameters of the lens meet the following conditions: 0.2<|Y/(f*TTL)|<0.8，0.6<f/TTL<1.4，0.1<Y/f<0.2，fIs the focal length of the lens, Y is the maximum object height of the lens, TTLThe distance between one surface of the first lens close to the imaging side and the light source is; the FOV of the lens satisfies: 15 < FOV < 30 °; the F number of the lens meets the following conditions: f number is less than 2.85.

Description

Infrared collimating lens and infrared lens module
Technical Field
The embodiment of the application relates to the field of optics, and more particularly relates to an infrared collimating lens and an infrared lens module.
Background
With the rise of the fields of face recognition, somatosensory games, pattern recognition and the like, three-dimensional depth detection has become a hotspot. A940 nm light source is generally adopted as a signal light source in three-dimensional depth detection, so that interference of visible light wave bands in sunlight on signals is avoided, and absorption of water molecules in air on 940nm light rays is small. The infrared collimating lens is used as an important component of the infrared lens module and is of great importance to the precision and the view field of depth detection. Therefore, how to improve the performance of the infrared collimating lens is a problem to be solved urgently.
Disclosure of Invention
The embodiment of the application provides an infrared collimating lens and an infrared lens module, and the infrared collimating lens has a larger view field and a smaller F number.
In a first aspect, an infrared collimating lens is provided, the lens includes a diaphragm, a first lens, a second lens and a third lens that are sequentially disposed from an imaging side to a light source side, wherein:
the first lens is a lens with positive focal power, a paraxial region close to the light source side of the first lens is a convex surface, a paraxial region close to the imaging side of the first lens is a concave surface, and at least one surface of two surfaces of the first lens is an aspheric surface;
the second lens is a lens with negative focal power, a paraxial region close to an imaging side of the second lens is a concave surface, and at least one of two surfaces of the second lens is an aspheric surface;
the third lens is a lens with positive focal power, a paraxial region of the third lens close to the light source side is a convex surface, and at least one of two surfaces of the third lens is an aspheric surface;
the parameters of the lens meet the following conditions:0.2<|Y/(f*TTL)|<0.8，0.6<f/TTL<1.4, wherein,fthe focal length of the lens is, Y is the maximum object height of the lens, and TTL is the distance from the surface of the first lens element close to the imaging side to the light source.
In one possible implementation, the parameters of the shot further satisfy: 0.1<Y/f<0.2。
In one possible implementation, the field angle FOV of the lens satisfies: 15 < FOV < 30.
In one possible implementation, the F-number of the shot satisfies: f number is less than 2.85.
In one possible implementation, the relative illumination RI of the lens satisfies: RI > 92%.
In one possible implementation, Y @f*TTL=0.49；f/TTL=1.13；Y/f= 0.19; FOV =24 °; f number = 2.8.
In one possible implementation, Y @f*TTL=0.66；f/TTL=0.84；Y/f= 0.18; FOV =24 °; f number = 2.84.
In one possible implementation, Y @f*TTL=0.42；f/TTL=1.10；Y/f= 0.18; FOV =24 °; f number = 2.81.
In one possible implementation, Y @f*TTL=0.35；f/TTL=1.22；Y/f= 0.15; FOV =20 °; f number = 2.8.
In one possible implementation, the focal length of the first lensf 1Focal length of the second lensf 2And satisfies the following conditions: -0.7<f 2/f 1<-0.2。
In one possible implementation, the focal length of the first lensf 1Focal length of the third lensf 3And satisfies the following conditions: 0.6<f 3/f 1<1.2。
In one possible implementation, the central thickness CT1 of the first lens and the central thickness CT2 of the second lens satisfy: 1.2< CT1/CT2< 3.0.
In one possible implementation, the central thickness CT2 of the second lens and the central thickness CT3 of the third lens satisfy: 0< CT2/CT3< 0.6.
In one possible implementation, the refractive index of the material of the first lensn 1＞1.6。
In one possible implementation, the refractive index of the material of the second lensn 2＞1.6。
In one possible implementation, the refractive index of the material of the third lensn 3＞1.6。
In one possible implementation, the focal length of the first lensf 1Focal length of the lensfSatisfies the following conditions: 0.3<f 1/f<0.8。
In one possible implementation, the focal length of the third lensf 3Focal length of the lensfSatisfies the following conditions: 0.2<f 3/f<0.6。
In one possible implementation, the focal length of the first lensf 1And a radius of curvature R1 of a paraxial region of the first lens on the image side satisfies: 2.0<f 1/R1<2.5。
In one possible implementation, the focal length of the first lensf 1And a radius of curvature R2 of the paraxial region of the first lens on the light source side satisfies: 0.5<f 1/R2<1.4。
In one possible implementation, the focal length of the second lensf 2And a radius of curvature R3 of a paraxial region of the second lens on the image side satisfies: 0.8<f 2/R3<1.6。
In one possible implementation, the focal length of the second lensf 2 And a radius of curvature R4 of the paraxial region of the second lens on the light source side satisfies: -0.8<f 2 /R4<0。
In a possible implementation mannerThe focal length of the third lensf 3 And a radius of curvature R6 of a paraxial region of the third lens on the image side satisfies: -2<f 3 /R6<-1。
In one possible implementation, a radius of curvature R1 of the first lens in a paraxial region near the imaging side and a radius of curvature R2 of the first lens in a paraxial region near the light source side satisfy: 0.2< R1/R2< 0.6.
In one possible implementation, a radius of curvature R3 of the second lens in a paraxial region near the imaging side and a radius of curvature R4 of the second lens in a paraxial region near the light source side satisfy: -0.8< R3/R4< 0.
In one possible implementation manner, the infrared collimating lens is applied to depth detection.
In a second aspect, an infrared lens module is provided, which includes:
the infrared collimator lens according to the first aspect or any possible implementation manner of the first aspect;
and an array light source having a plurality of light emitting points.
The light source may be, for example, a Vertical Cavity Surface Emitting Laser (VCSEL) light emitting array.
Based on the technical scheme, the infrared collimating lens comprises three lenses. The focal length of the lens is realized by designing the focal power and the shape of the three lensesfThe maximum object height Y of the lens and the longitudinal distance TTL between one surface of the first lens close to the imaging side and the light source satisfy 0.2<|Y/(f*TTL)|<0.8，0.6<f/TTL<1.4, thereby having a larger field angle FOV, a smaller F-number and a larger relative illumination, thereby improving the field of view and the precision of the infrared collimating lens.
Drawings
Fig. 1 is a schematic structural diagram of an infrared lens module according to an embodiment of the present application.
Fig. 2 is a schematic diagram of a collimated light path of a lens in the infrared lens module shown in fig. 1.
Fig. 3 is a schematic diagram of an infrared collimator lens according to an embodiment of the present application.
Fig. 4 is a schematic diagram of a layout of a lens according to an embodiment of the present application.
Fig. 5 is a schematic view of a astigmatic aberration curve of the lens shown in fig. 4.
Fig. 6 is a schematic diagram of a distorted convergence curve of the lens shown in fig. 4.
Fig. 7 is a diagram of MTF curves of the lens shown in fig. 4.
Fig. 8 is a diagram illustrating a graph of relative illuminance of the lens shown in fig. 4.
Fig. 9 is a schematic diagram of another layout of lenses according to an embodiment of the present application.
Fig. 10 is a schematic view of a astigmatic aberration curve of the lens shown in fig. 9.
Fig. 11 is a schematic diagram of a distorted convergence curve of the lens shown in fig. 9.
Fig. 12 is a diagram of MTF curves of the lens shown in fig. 9.
Fig. 13 is a schematic diagram of a graph of relative illuminance of the lens shown in fig. 10.
Fig. 14 is a schematic diagram of another layout of lenses according to an embodiment of the present application.
Fig. 15 is a schematic view of a astigmatic aberration curve of the lens shown in fig. 14.
Fig. 16 is a schematic diagram of a distorted convergence curve of the lens shown in fig. 14.
Fig. 17 is a diagram of MTF curves of the lens shown in fig. 14.
Fig. 18 is a schematic diagram of a graph of relative illuminance of the lens shown in fig. 14.
Fig. 19 is a schematic diagram of another layout of lenses according to an embodiment of the present application.
Fig. 20 is a schematic diagram of a astigmatic aberration curve of the lens shown in fig. 19.
Fig. 21 is a schematic diagram of a distorted slip curve of the lens shown in fig. 19.
Fig. 22 is a diagram of MTF curves of the lens shown in fig. 19.
Fig. 23 is a schematic diagram of a graph of relative illuminance of the lens shown in fig. 19.
Detailed Description
The technical solution in the present application will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of an infrared lens module according to an embodiment of the present application. As shown in fig. 1, the infrared lens module 100 at least includes an infrared collimating lens (hereinafter, referred to as lens) 110, a lens barrel 120 and a light source 130.
The lens 110 is a signal collecting part, and is a core component of the infrared lens module 100, and may be an optical structure formed by a spherical surface or an aspherical surface, and is used for focusing incident light onto the photosensitive chip. The lens 110 may be formed by combining one or more lenses, and each lens may be formed by injection molding using a material such as resin.
The Barrel 120 (Barrel) is a non-light-absorbing support for fixing the lens 110.
It should be understood that the structure of the infrared lens module 100 shown in fig. 1 is merely an example, and the embodiment of the present application mainly improves the lens 110 therein, and does not limit the position and parameters of other structures and devices.
As shown in fig. 2, the lens 110 includes an imaging surface 116, an optical axis 117, a stop 115, a lens 111, a lens 112, a lens 113, and a light source surface 114. The lens 110 in the embodiment of the present application may be, for example, a semiconductor laser light source or other laser light sources. Taking the light rays of the central field of view as an example, the light rays emitted from the light source surface 114 are converged by the collimating lens group to form parallel light, and finally projected to the imaging surface 116.
The embodiment of the application designs the infrared collimating lens which has a larger field angle and a smaller F number, so that the infrared collimating lens has better performance.
For better understanding, first, parameters for evaluating the performance of the infrared collimating lens designed in the embodiments of the present application will be briefly described.
Field angle (Field Of View, FOV): the field of view range used for representing the lens is that, in the case of equal lens size, the greater the FOV of the lens is, the larger the information that the lens can obtain the larger area is, that is, the larger the amount of information that can be obtained by using the lens is.
Working F-number, or F-number (Fno): the reciprocal of the relative aperture of the lens is used for representing the light quantity which enters the photosensitive chip through the lens. The smaller the F number, the more the amount of light entering the lens.
TV Distortion (TV distorsion): for measuring the degree of visual distortion of the image. It can be appreciated that the smaller the TV distortion, the better the lens effect.
Relative Illuminance (RI): the ratio of the illumination of different coordinate points on an imaging surface to the illumination of a central point is indicated, the smaller the relative illumination is, the more uneven the illumination of the imaging surface is, and the problem of underexposure or central overexposure of certain positions is easily caused, so that the imaging quality is influenced; the greater the relative illuminance, the higher the imaging quality.
As shown in fig. 3, the lens 110 in the infrared lens module 100 shown in fig. 1 includes a first lens 111, a second lens 112 and a third lens 113 which are arranged in sequence from an imaging side (light exit side of the module) to a light source side.
The first lens 111 is a lens of positive power. The first lens element 111 is convex in a paraxial region close to the image side, and is concave in a paraxial region close to the light source side, and at least one of two surfaces of the first lens element 111 is aspheric.
The second lens 112 is a negative power lens. The second lens element 112 is concave in a paraxial region close to the image side, and at least one of two surfaces of the second lens element 112 is aspheric.
The third lens 113 is a lens of positive power. The third lens 113 is convex in a paraxial region on the light source side, and at least one of two surfaces of the third lens 113 is aspheric.
It should be understood that "the paraxial region of the lens near the light source side" described in the embodiments of the present application may also be expressed as "the light source side of the lens in the paraxial region"; the "paraxial region of the lens close to the imaging side" may also be expressed as "the imaging side of the lens in the paraxial region". For example, the first lens 111 is convex in a paraxial region close to the imaging side, that is, the first lens 111 is convex in the paraxial region on the imaging side.
It will also be understood that the "paraxial" or "paraxial region" of a lens may refer to an angle to the optical axisθIn the region of paraxial rays of (1), whereinθSatisfies the following conditions:θ≈sinθ。for example,θmay be less than 5.
The first lens 111, the second lens 112 and the third lens 113 may be formed by injection molding using a resin material or other plastic materials, for example, and are not limited herein.
Wherein the focal length of the lens 110fThe maximum object height Y of the lens 110, and the distance between the surface of the first lens 111 close to the imaging side and the light source, i.e., the Total Track Length (TTL) of the lens 110, satisfy predetermined conditions, such that the lens 110 has a large field angle FOV, a small F-number, a large relative illumination, and the like.
The preset condition is, for example, at least one of the following conditions: 0.2<|Y/(f*TTL)|<0.8、0.6<f/TTL<1.4, and 0.1<Y/f<0.2。
In the embodiment of the present application, a 3-piece lens is adopted as a signal collecting device, and the lens includes three lenses. The focal power and the shape of the three lenses are designed to ensure that the lenses arefAnd Y and TTL meet the preset conditions, so that the infrared collimating lens has a larger field angle FOV and a smaller F number, the longitudinal space occupied by the infrared collimating lens when the infrared collimating lens is assembled in the electronic equipment cannot be increased, and the field of view and the precision of the infrared collimating lens are improved under the condition of meeting the increasingly tense size limitation of the electronic equipment.
The infrared collimating lens can be applied to depth detection, for example, to realize depth detection of a target by using infrared rays.
Further, in depth detection, the infrared collimating lens can realize collimation of light, and the divergence angle of light spots emitted by the light source after passing through the infrared collimating lens can be smaller than 0.1 degrees, so that the collimation effect is ensured. In the embodiment of the application, a Surface light source may be adopted to form an infrared lens module or a near-infrared lens module, which is composed of a Vertical-Cavity Surface-Emitting Laser (VCSEL) light Emitting array, the collimating lens (collimat) and a diffusing sheet (Diffuser), and the like.
Of lens 110fY and TTL affect the FOV and F number of the lens, andfy and TTL also affect each other, thus through controlfAnd Y and TTL, the preset relationship is satisfied, so that the lens 110 has a larger FOV and a smaller F number to satisfy the collimation requirement of the lens, the photosensitive chip 150 can further obtain more light rays carrying target information, the effective photosensitive area of the photosensitive chip 150 is utilized to the maximum extent, and the resolution and the precision are improved.
When the lens 110 is infWhen Y and TTL satisfy the preset conditions, the FOV, F number, relative illuminance, etc. of the lens 110 can satisfy the requirements. For example, the FOV of the lens 110 is made to satisfy: the FOV is more than 15 degrees and less than 30 degrees so as to realize the balance of the precision requirement and the view field requirement of the depth detection; for another example, the F-number of the lens 110 satisfies: f number is less than 2.85, so that weak signals can be detected and exposure time can be shortened; for another example, the relative illuminance of the lens 110 satisfies: RI > 92% to improve uniformity of depth errors over the full field of view, and further, uniformity of the lens 110 may reach 2.5%. In addition, the lens 110 may have a smaller size, such as a TTL smaller than 3.7 mm.
The conditions that the respective parameters of the lens 110 should satisfy are described above as a whole, and the following description is made with respect to the respective parameter designs of the first lens 111, the second lens 112, and the third lens 113 in the lens 110, respectively. When some or all of the following conditions are satisfied between the respective parameters of the respective lenses, the FOV and F-number of the lens 110 may be made to satisfy 15 ° < FOV < 30 °, F-number < 2.85, and RI > 92%, respectively.
For the first lens 111, optionally, the focal length of the first lens 111f 1And the radius of curvature of the first lens 111. E.g. focal lengthf 1Satisfies 2.0 with the curvature radius R1 of the paraxial region of the first lens 111 on the image side<f 1/R1<2.5; as another example of the present invention,focal lengthf 1Satisfies 0.5 with the curvature radius R2 of the paraxial region of the first lens 111 on the light source side<f 1/R2<1.4。
For the second lens 112, optionally, the focal length of the second lens 112f 2And the radius of curvature of the second lens 112. E.g. focal lengthf 2Satisfies 0.8 with the curvature radius R3 of the paraxial region close to the imaging side of the second lens 112<f 2/R3<1.6; also for example, the focal lengthf 2 Satisfies-0.8 with the radius of curvature R4 of the paraxial region of the second lens 112 on the light source side<f 2 /R4<0。
For the third lens 113, optionally, the focal length of the third lens 113f 3And the radius of curvature of the third lens 113. E.g. focal lengthf 3Satisfies-2 with the radius of curvature R6 of the paraxial region of the third lens 113 on the side close to the light source<f 3 /R6<-1。
For each lens, there are two surfaces close to the light source side and the image forming side, respectively, optionally with a relation between their radii of curvature. For example, the first lens 111 satisfies 0.2< R1/R2<0.6 between the radius of curvature R1 of the paraxial region near the image side and the radius of curvature R2 of the paraxial region of the first lens 111 near the light source side; for another example, the radius of curvature R3 of the paraxial region on the image side of the second lens 112 and the radius of curvature R4 of the paraxial region on the light source side of the second lens 112 satisfy-0.8 < R3/R4< 0.
Therefore, by designing the focal lengths and the curvature radii of the three lenses, the FOV of the lens 110 can meet the requirements, the length and the weight of the lens 110 can be effectively reduced so as to be mounted on a light and thin electronic product, and the aberration and the field of view of the lens are reduced and increased, so that the performance of the lens 110 is effectively improved.
In the embodiment of the present application, the first lens 111 and the third lens 113 are lenses with positive focal power (positive refractive power), and the second lens 112 is a lens with negative focal power (negative refractive power)And (3) slicing. Specifically, for power distribution between the lenses, the respective focal lengths of the first lens 111, the second lens 112, and the third lens 113 and the focal length of the lens 110fThe following relationship exists between the two, so that the length of the lens 110 is shortened under the condition of meeting the requirement of the field of view, the sensitivity of the lens 110 is reduced, and the product yield is improved.
For example, the focal length of the first lens 111f 1Focal length of lens 110fSatisfies 0.3<f 1/f<0.8; as another example, the focal length of the third lens 113f 3Focal length of lens 110fSatisfies 0.2<f 3/f<0.6。
In addition, by adjusting the focal length ratio among the first lens 111, the second lens 112 and the third lens 113, the aberration is effectively reduced. For example, the focal length of the first lens 111f 1Focal length of the second lens 112f 2And satisfy-0.7 therebetween<f 2/f 1<-0.2; as another example, the focal length of the first lens 111f 1Focal length of the third lens 112f 3And satisfies 0.6 therebetween<f 3/f 1<1.2。
In order to ensure the formability and uniformity of the lens, make the structure of the lens 110 more robust, and improve the service life of the lens 110, the center thicknesses of the first lens 111, the second lens 112, and the third lens 113, i.e., the thicknesses of the lenses in the optical axis direction, may also be designed.
For example, 1.2< CT1/CT2<3.0 is satisfied between the central thickness CT1 of the first lens 111 and the central thickness CT2 of the second lens; for another example, 0< CT2/CT3<0.6 is satisfied between the central thickness CT2 of the second lens 112 and the central thickness CT3 of the third lens 113.
In addition, the refractive indices of the materials of the first lens 111, the second lens 112, and the third lens 113, and the like may also be designed in order to meet the dispersion requirement and to reduce the production cost, and to provide a suitable phase difference balance.
For example, the refractive index of the material of the first lens 111n1 is more than 1.6; as another example, the material of the second lens 112Refractive index ofn2 is more than 1.6; as another example, the refractive index of the material of the third lens 113n3＞1.6。
Optionally, in some implementations, the lens 110 further includes a diaphragm 115, which may also be referred to as an aperture. The stop 115 may be disposed on the image forming side of the first lens 111, for example.
The diaphragm 115 can be used for adjusting the size of the light range, the light range is adjusted by setting the diaphragm 115, and light carrying target information is reserved to the greatest extent, so that the photosensitive chip can obtain more target information, and the resolving power of the infrared lens module on the depth detection of the target is further improved.
In the embodiment of the present application, the parameters of the lens 110 may satisfy the preset relationship by controlling physical parameters such as the curvature radius, the thickness, the material, and the focal length of each component in the lens 110, for example, the first lens, the second lens, the third lens, the diaphragm, and the like, and/or even terms in the aspheric high-order term coefficients of the aspheric lens in the lens 110, so that the FOV of the lens 110 satisfies 15 ° < FOV < 30 °, the F number is less than 2.85, and the relative illumination RI > 92%. Hereinafter, some possible specific aspects of the lens 110 according to the embodiment of the present application will be specifically described by taking embodiment 1, embodiment 2, embodiment 3, and embodiment 4 as examples. The infrared collimator lens in embodiments 1 to 4 uses a 3-piece plastic aspheric lens, and may form, for example, an infrared single-wavelength collimating lens group, thereby implementing an infrared collimator lens having a high-quality image sensing function and an ultra-low height.
Example 1
The lens 110 includes three lenses, a layout (layout) of the respective lenses shown in fig. 4, in which, in order from the imaging side to the light source side: a diaphragm 115, a first lens 111, a second lens 112, and a third lens 113, and a light source surface 114.
For convenience of distinction and description, in order from the imaging side to the light source side, the imaging plane is denoted as S0, the stop 115 is denoted as S1, both surfaces of the first lens 111 are denoted as S2 and S3, both surfaces of the second lens 112 are denoted as S4 and S5, both surfaces of the third lens 113 are denoted as S6 and S7, and the light source plane 114 is denoted as S8.
Further, at least one of parameters such as focal length, center thickness, curvature radius, material, and the like of each lens in the lens 110, and aspheric high-order coefficient of an aspheric lens in the lens 110 are set so that FOV, F-number, relative illuminance, and the like of the lens 110 satisfy requirements.
In example 1, the relationship among the focal length, the radius of curvature, and the center thickness of each lens was set as shown in table 1. The curvature radius, thickness, material (refractive index, dispersion ratio) and focal length of each of the surfaces S0-S8 are set as shown in Table 2, wherein the thickness of the imaging surface can represent the distance between the imaging surface and the lens 110, i.e. the distance of the object to be projected. The aspheric high-order coefficient A2, A4, A6, A8, A10, A12, A14, A16 and A18 of the aspheric surfaces in S2-S7 are set as shown in Table 3, wherein the coefficients of A2 are all 0, and the parameter K is a conic constant.
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Based on the parameters shown in table 1, table 2, and table 3, the parameters of the lens 110 shown in embodiment 1 may be determined as follows: TTL =2.7 mm and is,f=3.00mm, F number =2.8, FOV =24 °.
Fig. 5 shows a curvature of astigmatism of the lens 110; fig. 6 shows a distorted convergence curve of the lens 110; fig. 7 shows Modulation Transfer Function (MTF) curves of the lens 110; fig. 8 shows the relative illuminance of the lens 110. As can be seen from the simulation diagrams shown in fig. 5 to 8, the parameters TTL, and TTL in the lens 110,fAnd Y satisfies the preset condition, the lens 110 has a larger FOV, a smaller working F-number, a smaller lens size (TTL), a smaller TV distortion and a larger lens sizeThe relative illumination and the performance of the lens are better.
Example 2
The lens barrel 110 includes three lenses, a layout of the respective lenses as shown in fig. 9, in which, in order from the imaging side to the light source side: a diaphragm 115, a first lens 111, a second lens 112, and a third lens 113, and a light source surface 114.
For convenience of distinction and description, in order from the imaging side to the light source side, the imaging plane is denoted as S0, the stop 115 is denoted as S1, both surfaces of the first lens 111 are denoted as S2 and S3, both surfaces of the second lens 112 are denoted as S4 and S5, both surfaces of the third lens 113 are denoted as S6 and S7, and the light source plane 114 is denoted as S8.
Further, at least one of parameters such as focal length, center thickness, curvature radius, material, and the like of each lens in the lens 110, and aspheric high-order coefficient of an aspheric lens in the lens 110 are set so that FOV, F-number, relative illuminance, and the like of the lens 110 satisfy requirements.
In example 2, the relationship among the focal length, the radius of curvature, and the center thickness of each lens was set as shown in table 4. The curvature radius, thickness, material (refractive index, dispersion ratio) and focal length of each of the surfaces S0-S8 are set as shown in Table 5, wherein the thickness of the imaging surface can represent the distance between the imaging surface and the lens 110, i.e. the distance of the object to be projected. The aspheric high-order coefficient A2, A4, A6, A8, A10, A12, A14, A16 and A18 of the aspheric surfaces in S2-S7 are set as shown in Table 6, wherein the coefficients of A2 are all 0, and the parameter K is a conic constant.
Figure 433403DEST_PATH_IMAGE004
Figure 358372DEST_PATH_IMAGE005
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Based on tables 4, 5 and6, the parameters of the lens 110 shown in embodiment 1 can be determined as follows: TTL =3.6 mm and is,f=3.00mm, F number =2.84, FOV =24 °.
Fig. 10 shows a curvature of astigmatism of the lens 110; fig. 11 shows a distorted convergence curve of the lens 110; fig. 12 shows MTF curves of the lens 110; fig. 13 shows the relative illuminance of the lens 110. As can be seen from the simulation diagrams shown in fig. 10 to 13, the parameters of the lens 110fY and TTL satisfy the above preset conditions, the lens 110 has a larger FOV, a smaller number of working F, a smaller lens size, a smaller TV distortion, and a larger relative illuminance, and the performance of the lens is better.
Example 3
The lens barrel 110 includes three lenses, a layout of the respective lenses as shown in fig. 14, in which, in order from the imaging side to the light source side: a diaphragm 115, a first lens 111, a second lens 112, and a third lens 113, and a light source surface 114.
For convenience of distinction and description, in order from the imaging side to the light source side, the imaging plane is denoted as S0, the stop 115 is denoted as S1, both surfaces of the first lens 111 are denoted as S2 and S3, both surfaces of the second lens 112 are denoted as S4 and S5, both surfaces of the third lens 113 are denoted as S6 and S7, and the light source plane 114 is denoted as S8.
Further, at least one of parameters such as focal length, center thickness, curvature radius, material, and the like of each lens in the lens 110, and aspheric high-order coefficient of an aspheric lens in the lens 110 are set so that FOV, F-number, relative illuminance, and the like of the lens 110 satisfy requirements.
In example 3, the relationship among the focal length, the radius of curvature, and the center thickness of each lens was set as shown in table 7. The curvature radius, thickness, material (refractive index, dispersion ratio), and focal length of each of the surfaces S0-S8 are set as shown in Table 8, wherein the thickness of the imaging surface can represent the distance between the imaging surface and the lens 110, i.e. the distance to which the target is projected. The aspheric high-order coefficient A2, A4, A6, A8, A10, A12, A14, A16 and A18 of the aspheric surfaces in S2-S7 are set as shown in Table 9, wherein the coefficients of A2 are all 0, and the parameter K is a conic constant.
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Based on the parameters shown in table 7, table 8, and table 9, the parameters of the lens 110 shown in embodiment 3 can be determined as follows: TTL =2.32 mm and is,f=2.55mm, F number =2.81, FOV =24 °.
Fig. 15 shows a curvature of astigmatism of the lens 110; fig. 16 shows a distorted convergence curve of the lens 110; fig. 17 shows MTF curves of the lens 110; fig. 18 shows the relative illuminance of the lens 110. As can be seen from the simulation diagrams shown in fig. 15 to 18, the parameters at the lens 110fY and TTL satisfy the above preset conditions, the lens 110 has a larger FOV, a smaller number of working F, a smaller lens size, a smaller TV distortion, and a larger relative illuminance, and the performance of the lens is better.
Example 4
The lens barrel 110 includes three lenses, a layout of the respective lenses as shown in fig. 19, in which, in order from the imaging side to the light source side: a diaphragm 115, a first lens 111, a second lens 112, and a third lens 113, and a light source surface 114.
For convenience of distinction and description, in order from the imaging side to the light source side, the imaging plane is denoted as S0, the stop 115 is denoted as S1, both surfaces of the first lens 111 are denoted as S2 and S3, both surfaces of the second lens 112 are denoted as S4 and S5, both surfaces of the third lens 113 are denoted as S6 and S7, and the light source plane 114 is denoted as S8.
Further, at least one of parameters such as focal length, center thickness, curvature radius, material, and the like of each lens in the lens 110, and aspheric high-order coefficient of an aspheric lens in the lens 110 are set so that FOV, F-number, relative illuminance, and the like of the lens 110 satisfy requirements.
In example 4, the relationship among the focal length, the radius of curvature, and the center thickness of each lens was set as shown in table 10. The curvature radius, thickness, material (refractive index, dispersion ratio), and focal length of each of the surfaces S0-S8 are set as shown in Table 11, wherein the thickness of the imaging surface can represent the distance between the imaging surface and the lens 110, i.e. the distance to which the object is projected. The aspheric high-order coefficient A2, A4, A6, A8, A10, A12, A14, A16 and A18 of the aspheric surfaces in S2-S7 are set as shown in Table 12, wherein the coefficients of A2 are all 0, and the parameter K is a conic constant.
Figure 96520DEST_PATH_IMAGE010
Figure 739991DEST_PATH_IMAGE011
Figure 75158DEST_PATH_IMAGE012
Based on the parameters shown in table 10, table 11, and table 12, the parameters of the lens 110 shown in embodiment 4 can be determined as follows: TTL =2.3 mm and is,f=2.80mm, F number =2.8, FOV =20 °.
Fig. 20 shows a curvature of astigmatism of the lens 110; fig. 21 shows a distorted convergence curve of the lens 110; fig. 22 shows MTF curves of the lens 110; fig. 23 shows the relative illuminance of the lens 110. As can be seen from the simulation diagrams shown in fig. 20 to 23, the parameters at the lens 110fY and TTL satisfy the above preset conditions, the lens 110 has a larger FOV, a smaller number of working F, a smaller lens size, a smaller TV distortion, and a larger relative illuminance, and the performance of the lens is better.
In tables 1 to 12, the position corresponding to the parameter is blank, which means that the parameter is absent or the value of the parameter is 0.
Y' of the lens 110,fAnd TTL affects lens size, FOV, F-number sumRelative illuminance, etc. The spatial dimension of the lens 110, i.e. TTL, directly affects the difficulty of designing the lens 110, in the embodiment of the present application, by designing Y'/(TTL)fTTL) andfTTL, the lens 110 can be made to have a smaller TTL, e.g., TTL < 3.7, especially in embodiments 3 and 4, TTL is less than 2.4. And under the condition of ensuring that the lens 110 has better resolving power, the lens avoids occupying larger space size. Further, the angle of view FOV or the like of the lens 110 corresponds to Y @fIs correlated by design YfThe lens 110 can be made to have a larger field angle FOV, thereby improving the field of view and accuracy of the infrared collimating lens while meeting the increasingly tight size constraints of electronic devices.
In the lens 110 of the present application, the lens 110 has a large field of view, and the sizes of the light passing holes corresponding to the collimating lens groups formed by the lenses in the lens 110 are balanced.
By optimizing the relative illumination, the uniformity of depth error of the lens 110 over the full field of view is also improved.
In addition, the lens 110 has better light emitting parallelism, and the accuracy rate and the recognition speed of depth detection are increased.
It should be noted that, without conflict, the embodiments and/or technical features in the embodiments described in the present application may be arbitrarily combined with each other, and the technical solutions obtained after the combination also fall within the protection scope of the present application.
It should be understood that the specific examples in the embodiments of the present application are for the purpose of promoting a better understanding of the embodiments of the present application, and are not intended to limit the scope of the embodiments of the present application, and that various modifications and variations can be made by those skilled in the art based on the above embodiments and fall within the scope of the present application.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (23)

1. The utility model provides an infrared collimating lens which characterized in that, the camera lens includes diaphragm, first lens, second lens and the third lens that sets gradually from the formation of image side to the light source side, wherein:
the first lens is a lens with positive focal power, a paraxial region close to an image forming side of the first lens is a convex surface, a paraxial region close to a light source side of the first lens is a concave surface, and at least one surface of two surfaces of the first lens is an aspheric surface;
the second lens is a lens with negative focal power, a paraxial region close to an imaging side of the second lens is a concave surface, and at least one of two surfaces of the second lens is an aspheric surface;
the third lens is a lens with positive focal power, a paraxial region of the third lens close to the light source side is a convex surface, and at least one of two surfaces of the third lens is an aspheric surface;
wherein the parameters of the lens satisfy: 0.2<|Y/(f*TTL)|<0.8，0.6<f/TTL<1.4，0.1<Y/f<0.2, wherein,fthe focal length of the lens is, Y is the maximum object height of the lens, and TTL is the distance between one surface of the first lens, which is close to the imaging side, and a light source;
the field angle FOV of the lens satisfies: 15 < FOV < 30 °; the F number of the lens meets the following conditions: f number is less than 2.85.
2. The infrared collimating lens of claim 1, wherein Y ∑ is ∑ basedf*TTL=0.49；f/TTL=1.13；Y/f= 0.19; FOV =24 °; f number = 2.8.
3. The infrared collimating lens of claim 1, wherein Y ∑ is ∑ basedf*TTL=0.66；f/TTL=0.84；Y/f= 0.18; FOV =24 °; f number = 2.84.
4. The infrared collimator lens of claim 1, whereinIn, Y-f*TTL=0.42；f/TTL=1.10；Y/f= 0.18; FOV =24 °; f number = 2.81.
5. The infrared collimating lens of claim 1, wherein Y ∑ is ∑ basedf*TTL=0.35；f/TTL=1.22；Y/f= 0.15; FOV =20 °; f number = 2.8.
6. The IR collimating lens of any one of claims 1 to 5, wherein the first lens has a focal lengthf 1Focal length of the second lensf 2And satisfies the following conditions: -0.7<f 2/f 1<-0.2。
7. The IR collimating lens of any one of claims 1 to 5, wherein the first lens has a focal lengthf 1Focal length of the third lensf 3And satisfies the following conditions: 0.6<f 3/f 1<1.2。
8. The infrared collimator lens as claimed in any one of claims 1 to 5, wherein the central thickness CT1 of the first lens and the central thickness CT2 of the second lens satisfy: 1.2< CT1/CT2< 3.0.
9. The infrared collimator lens as claimed in any one of claims 1 to 5, wherein the central thickness CT2 of the second lens and the central thickness CT3 of the third lens satisfy: 0< CT2/CT3< 0.6.
10. The IR collimating lens of any of claims 1 to 5, wherein the refractive index of the material of the first lensn 1＞1.6。
11. The IR collimating lens of any of claims 1 to 5, wherein the material of the second lens has a refractive indexn 2＞1.6。
12. The IR collimating lens of any of claims 1 to 5, wherein the material of the third lens has a refractive indexn 3＞1.6。
13. The IR collimating lens of any one of claims 1 to 5, wherein the first lens has a focal lengthf 1Focal length of the lensfSatisfies the following conditions: 0.3<f 1/f<0.8。
14. The IR collimating lens of any one of claims 1 to 5, wherein the third lens has a focal lengthf 3Focal length of the lensfSatisfies the following conditions: 0.2<f 3/f<0.6。
15. The IR collimating lens of any one of claims 1 to 5, wherein the first lens has a focal lengthf 1And a radius of curvature R1 of a paraxial region of the first lens on the image side satisfies: 2.0<f 1/R1<2.5。
16. The IR collimating lens of any one of claims 1 to 5, wherein the first lens has a focal lengthf 1And a radius of curvature R2 of the paraxial region of the first lens on the light source side satisfies: 0.5<f 1/R2<1.4。
17. The IR collimating lens of any one of claims 1 to 5, wherein the second lens has a focal lengthf 2And a radius of curvature R3 of a paraxial region of the second lens on the image side satisfies: 0.8<f 2/R3<1.6。
18. The method of any one of claims 1 to 5The infrared collimating lens, characterized in that the focal length of the second lensf 2 And a radius of curvature R4 of the paraxial region of the second lens on the light source side satisfies: -0.8<f 2 /R4<0。
19. The IR collimating lens of any one of claims 1 to 5, wherein the third lens has a focal lengthf 3 And a radius of curvature R6 of a paraxial region of the third lens on the image side satisfies: -2<f 3 /R6<-1。
20. The infrared collimator lens as claimed in any one of claims 1 to 5, wherein a radius of curvature R1 of a paraxial region near an image forming side of the first lens and a radius of curvature R2 of a paraxial region near a light source side of the first lens satisfy: 0.2< R1/R2< 0.6.
21. The infrared collimator lens as claimed in any one of claims 1 to 5, wherein a radius of curvature R3 of a paraxial region near an image forming side of the second lens and a radius of curvature R4 of a paraxial region near a light source side of the second lens satisfy: -0.8< R3/R4< 0.
22. The infrared collimator lens as claimed in any one of claims 1 to 5, wherein the infrared collimator lens is used in depth detection.
23. An infrared lens module, comprising:
the infrared collimating lens of any one of claims 1 to 22; and the number of the first and second groups,
an array light source having a plurality of light emitting points.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022052133A1 (en) * 2020-09-14 2022-03-17 深圳市汇顶科技股份有限公司 Infrared collimating lens and infrared lens module
CN114924393A (en) * 2022-05-13 2022-08-19 深圳市汇顶科技股份有限公司 Infrared projection lens

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1306623A (en) * 1998-06-24 2001-08-01 美国精密镜片股份有限公司 Projection television lens systems having improved modulation transfer functions
US20060050408A1 (en) * 2004-09-08 2006-03-09 Manabu Hakko Zoom optical system
US20080285160A1 (en) * 2007-05-04 2008-11-20 Samsung Electro-Mechanics Co., Ltd. Projection lens
CN102411191A (en) * 2010-09-21 2012-04-11 株式会社尼康 Viewing Optical System, Viewfinder Equipped With The Viewing Optical System And Method For Manufacturing The Viewing Optical System
CN208110175U (en) * 2017-09-30 2018-11-16 深圳奥比中光科技有限公司 Lens system, structured light projection mould group and depth camera
CN109557650A (en) * 2018-12-11 2019-04-02 江西联益光学有限公司 Collimate camera lens and projective module group

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101236292A (en) * 2007-02-01 2008-08-06 大立光电股份有限公司 Shooting lens group
JP2009098505A (en) * 2007-10-18 2009-05-07 Sony Corp Imaging lens and imaging device
CN111505809B (en) * 2020-07-01 2020-10-16 深圳市汇顶科技股份有限公司 Infrared imaging lens

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1306623A (en) * 1998-06-24 2001-08-01 美国精密镜片股份有限公司 Projection television lens systems having improved modulation transfer functions
US20060050408A1 (en) * 2004-09-08 2006-03-09 Manabu Hakko Zoom optical system
US20080285160A1 (en) * 2007-05-04 2008-11-20 Samsung Electro-Mechanics Co., Ltd. Projection lens
CN102411191A (en) * 2010-09-21 2012-04-11 株式会社尼康 Viewing Optical System, Viewfinder Equipped With The Viewing Optical System And Method For Manufacturing The Viewing Optical System
CN208110175U (en) * 2017-09-30 2018-11-16 深圳奥比中光科技有限公司 Lens system, structured light projection mould group and depth camera
CN109557650A (en) * 2018-12-11 2019-04-02 江西联益光学有限公司 Collimate camera lens and projective module group
US20200249446A1 (en) * 2018-12-11 2020-08-06 Jiangxi Lianyi Optics Co., Ltd. Collimating lens, projecting module and mobile phone

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022052133A1 (en) * 2020-09-14 2022-03-17 深圳市汇顶科技股份有限公司 Infrared collimating lens and infrared lens module
CN114924393A (en) * 2022-05-13 2022-08-19 深圳市汇顶科技股份有限公司 Infrared projection lens
CN114924393B (en) * 2022-05-13 2024-01-26 深圳市汇顶科技股份有限公司 Infrared projection lens

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