CN110737074A - High-pixel infrared optical system and camera module applying same - Google Patents

High-pixel infrared optical system and camera module applying same Download PDF

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Publication number
CN110737074A
CN110737074A CN201911044152.0A CN201911044152A CN110737074A CN 110737074 A CN110737074 A CN 110737074A CN 201911044152 A CN201911044152 A CN 201911044152A CN 110737074 A CN110737074 A CN 110737074A
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China
Prior art keywords
lens
optical system
focal length
pixel
infrared optical
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CN201911044152.0A
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Chinese (zh)
Inventor
杜亮
汪鸿飞
刘振庭
刘洪海
刘佳俊
刘易
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Guangdong Hongjing Optoelectronics Technology Co Ltd
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Guangdong Hongjing Optoelectronics Technology Co Ltd
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Priority to CN201911044152.0A priority Critical patent/CN110737074A/en
Priority to PCT/CN2019/126529 priority patent/WO2021082223A1/en
Publication of CN110737074A publication Critical patent/CN110737074A/en
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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
    • G02B13/004—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 four lenses
    • 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
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/025—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using glue

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

The embodiment of the invention discloses high-pixel infrared optical systems, which sequentially comprise a th lens, a second lens, a third lens and a fourth lens from an object surface to an image surface along an optical axis, wherein the object surface side of the th lens is a convex surface, the image surface side of the th lens is a concave surface, the focal power of the th lens is negative, the object surface side of the second lens is a convex surface, the image surface side of the second lens is a concave surface, the focal power of the second lens is positive, the object surface side of the third lens is a concave surface, the focal power of the third lens is positive, the object surface side of the fourth lens is a convex surface, and the image surface side of the fourth lens is a concave surface.

Description

High-pixel infrared optical system and camera module applying same
The technical field is as follows:
the invention relates to optical systems and camera modules applied by the optical systems, in particular to high-pixel infrared optical systems and camera modules applied by the infrared optical systems.
Background art:
with the application of infrared imaging technology and the development of intelligent driving assistance systems, the infrared lens is more and more widely applied to the field of vehicles.
The invention content is as follows:
in order to solve the problems of large number of lenses and high cost of the traditional infrared lens, the embodiment of the invention provides high-pixel infrared optical systems.
high-pixel infrared optical system comprises a lens, a second lens, a third lens and a fourth lens in sequence from an object plane to an image plane along an optical axis;
the object plane side of the th lens is a convex surface, the image plane side is a concave surface, and the focal power is negative;
the object surface side of the second lens is a convex surface, the image surface side of the second lens is a concave surface, and the focal power of the second lens is positive;
the object surface side of the third lens is a concave surface, the image surface side is a convex surface, and the focal power of the third lens is positive;
the object plane side of the fourth lens is a convex surface, and the image plane side of the fourth lens is a concave surface.
In addition, , the embodiment of the invention also provides camera modules.
kinds of camera modules at least comprise an optical lens, and the high-pixel infrared optical system is arranged in the optical lens.
The optical system and the camera module of the embodiment of the invention mainly comprise 4 lenses, the number of the lenses is small, and the structure is simple; different lenses are combined with each other and the focal power is reasonably distributed, so that the lens has good optical properties such as large aperture, small distortion, high pixel and very good athermal property.
Description of the drawings:
in order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an optical system or camera module according to the present invention;
FIG. 2 is a distortion curve at +25 ℃ for an optical system or camera module of the present invention;
FIG. 3 is a graph of MTF at +25 ℃ for an optical system or camera module of the present invention;
FIG. 4 is a diagram of the relative illumination at +25 ℃ of the optical system or camera module of the present invention;
FIG. 5 is a plot of the MTF at-40 ℃ for an optical system or camera module of the present invention;
FIG. 6 is a graph of MTF at +85 ℃ for an optical system or camera module of the present invention;
FIG. 7 is a second schematic structural diagram of an optical system or a camera module according to the present invention;
the specific implementation mode is as follows:
in order to make the technical problems, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail in with reference to the accompanying drawings and embodiments.
When embodiments of the present invention refer to the ordinal numbers "", "second", etc., it should be understood that the terms are used for distinguishing only, unless the context clearly dictates otherwise.
In the description of the present invention, it should be noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "connected" are used to mean, for example, either fixedly or removably connected or physically connected, mechanically or electrically connected, directly or indirectly connected through an intermediary, or communicating between two elements.
The embodiment of the invention provides high-pixel infrared optical systems, which sequentially comprise a lens 1, a second lens 2, a third lens 3 and a fourth lens 4 from an object plane to an image plane along an optical axis.
The object plane side of the th lens 1 is a convex surface, the image plane side is a concave surface, and the focal power thereof is negative;
the object surface side of the second lens 2 is a convex surface, the image surface side is a concave surface, and the focal power is positive;
the object plane side of the third lens 3 is a concave surface, the image plane side is a convex surface, and the focal power is positive;
the object surface side of the fourth lens element 4 is a convex surface, and the image surface side is a concave surface, and the power thereof may be positive or negative.
The optical system of the embodiment of the invention mainly comprises 4 lenses, the number of the lenses is small, and the structure is simple; different lenses are combined with each other and the focal power is reasonably distributed, so that the lens has good performances of large aperture, small distortion, high pixel, good athermal function and the like.
As an exemplary embodiment, but not limiting, in this embodiment, as shown in fig. 1, the object surface side of the th lens 1 is a convex surface, the image surface side is a concave surface, and the focal power thereof is negative, the object surface side of the second lens 2 is a convex surface, the image surface side is a concave surface, and the focal power thereof is positive, the object surface side of the third lens 3 is a concave surface, the image surface side is a convex surface, and the focal power thereof is positive, and the object surface side of the fourth lens 4 is a convex surface, and the image surface side is a concave surface, and the focal power thereof is positive.
As an exemplary embodiment, but not limiting, in this embodiment, as shown in fig. 7, the object surface side of the th lens 1 is a convex surface, the image surface side is a concave surface, and the focal power thereof is negative, the object surface side of the second lens 2 is a convex surface, the image surface side is a concave surface, and the focal power thereof is positive, the object surface side of the third lens 3 is a concave surface, the image surface side is a convex surface, and the focal power thereof is positive, and the object surface side of the fourth lens 4 is a convex surface, the image surface side is a concave surface, and the focal power thereof is negative.
, as a preferred embodiment of the present invention, the optical system satisfies TTL/EFL ≦ 1.79, where TTL is the distance between the object plane side vertex of the th lens 1 of the optical system and the imaging plane 6, and EFL is the effective focal length of the optical system.
As a preferred embodiment of the present invention, the combination lens is formed by gluing the th lens and the second lens together, which has simple and compact structure, and good optical performance can be ensured by combining different lenses and reasonably distributing the optical power.
Further , as a preferred embodiment of the present invention, not limited to the above, each lens of the optical system satisfies the following conditions:
(1)-10<f1<-3；
(2)2<f2<5；
(3)3<f3<10；
(4)-270<f4<100；
wherein f1 is the focal length of the lens 1, f2 is the focal length of the second lens 2, f3 is the focal length of the third lens 3, and f4 is the focal length of the fourth lens 4.
Further , as a preferred embodiment of the present solution, not limited thereto, each lens of the optical system satisfies the following condition:
(1)-3.0<f1/f<-1.0；
(2)0.5<f2/f<3.0；
(3)0.5<f3/f<3.0；
(4)-50.0<f4/f<20.0；
wherein f is the focal length of the whole optical system, f1 is the focal length of the th lens 1, f2 is the focal length of the second lens 2, f3 is the focal length of the third lens 3, and f4 is the focal length of the fourth lens 4.
, the refractive index Nd1 and Abbe constant Vd1 of the th lens 1 satisfy 1.40< Nd1<1.70 and 50< Vd1< 90.
, the refractive index Nd2 and Abbe constant Vd2 of the material of the second lens 2 satisfy 1.85< Nd2<2.05 and 20< Vd2< 40.
Further , as a preferred embodiment of the present solution, but not limited thereto, the refractive index Nd3 of the material and the Abbe's constant Vd3 of the third lens 3 satisfy 1.50< Nd3<1.70, 20< Vd3< 40.
, the refractive index Nd4 and Abbe constant Vd4 of the material of the fourth lens 4 satisfy 1.50< Nd4<1.70 and 20< Vd4< 40.
Further , as a specific implementation way of the present solution and not limitation, the diaphragm 5 of the optical system is located between the second lens 2 and the third lens 3 for adjusting the intensity of the light beam, preferably, the diaphragm 5 is located on the object side of the second lens 2, and in the present embodiment, the positions of the lenses and the diaphragm are fixed.
, the third lens 3 and the fourth lens 4 are plastic aspheric lenses as the preferred embodiment of the present invention, which can effectively eliminate the effect of spherical aberration on the lens performance, improve the resolution of the optical lens, effectively eliminate thermal aberration, and reduce the processing difficulty and production cost of the lens.
As a preferred embodiment of the present solution, but not limited to, a band pass filter is disposed between the fourth lens element 4 and the image plane 6 to filter the visible light in the environment to avoid the visible light interference phenomenon.
Specifically, referring to fig. 1, in the present embodiment, the focal length f1 of the th lens 1 is-7.938 mm, the focal length f2 of the second lens 2 is 3.562mm, the focal length f3 of the third lens 3 is 8.168mm, and the focal length f4 of the fourth lens 4 is 67.417mm in the present embodiment, along the optical axis direction, the thickness value D1 from the object plane side vertex of the th lens 1 to the image plane side vertex thereof, the thickness value D2 from the object plane side vertex of the second lens 2 to the image plane side vertex thereof, and the interval D3 from the image plane side vertex of the second lens 2 to the object plane side vertex of the third lens 3 satisfy D1+ D2< D3, basic parameters of the present optical system are as shown in the following table:
surface of Radius of curvature R (mm) Spacing D (mm) Refractive index Nd Dispersion value Vd
S1 12.0 0.50 1.5 70
S2 2.5 1.00 1.9 35
S3 17.0 0.15
STO INFINITY 1.80
S5 -2.0 1.30 1.6 23
S6 -1.5 0.10
S7 4.5 1.50 1.6 23
S8 4.0 2.00
S9 INFINITY 0.70 1.5 64
S10 INFINITY 0.30
IMA INFINITY 0.00
In the above table, from the object plane to the image plane along the optical axis, S1 and S2 correspond to two surfaces of the th lens 1, S2 and S3 correspond to two surfaces of the second lens 2, STO is the position of the stop, S5 and S6 correspond to two surfaces of the third lens 3, S7 and S8 correspond to two surfaces of the fourth lens 4, S9 and S10 correspond to two surfaces of the bandpass filter, and IMA is the image plane 6.
More specifically, the surfaces of the third lens 3 and the fourth lens 4 are aspheric in shape, and satisfy the following equation:
Figure BDA0002253668160000071
wherein, the parameter c is 1/R, namely the curvature corresponding to the radius, y is a radial coordinate, the unit of which is the same as the unit of the length of the lens, k is a conic coefficient, a1To a6Are respectively in each radial directionAnd the coefficient corresponding to the coordinate. The aspheric correlation values of the S5 surface and the S6 surface of the third lens 3, and the S7 surface and the S8 surface of the fourth lens 4 are shown in the following table:
K a1 a2 a3 a4
S5 -0.40 0 -0.003409507633833000 -0.016038167970829999 0.012480154401390000
S6 -0.70 0 0.000235028520440300 -0.000038830217112540 0.000330841178015300
S7 0.20 0 -0.022305296602539999 0.005448659620065000 -0.000838933906264700
S8 0.80 0 -0.040782844476839997 0.006602358763897000 -0.000803390991681700
as can be seen from fig. 2 to 6, the optical system in the present embodiment has good optical performance such as high resolution and excellent athermal performance.
kinds of camera modules at least comprise an optical lens, and the high-pixel infrared optical system is arranged in the optical lens.
The optical system and the camera module of the embodiment of the invention mainly comprise 4 lenses, the number of the lenses is small, and the structure is simple; different lenses are combined with each other and the focal power is reasonably distributed, so that the lens has good performances of large aperture, small distortion, high pixel, good athermal function and the like.
have been presented in conjunction with the detailed description, and it is not intended that the invention be limited to the precise form set forth, or that certain technical adaptations and modifications of the invention, similar or equivalent methods, structures, and methods of the invention, or additions and substitutions of techniques may be made without departing from the spirit and scope of the invention.

Claims (10)

  1. A high-pixel infrared optical system includes, in order from an object plane to an image plane along an optical axis, a th lens, a second lens, a third lens, and a fourth lens,
    the object plane side of the th lens is a convex surface, the image plane side is a concave surface, and the focal power is negative;
    the object surface side of the second lens is a convex surface, the image surface side of the second lens is a concave surface, and the focal power of the second lens is positive;
    the object surface side of the third lens is a concave surface, the image surface side is a convex surface, and the focal power of the third lens is positive;
    the object plane side of the fourth lens is a convex surface, and the image plane side of the fourth lens is a concave surface.
  2. 2. The high pixel infrared optical system of claim 1, wherein the optical system satisfies TTL/EFL ≦ 1.79, where TTL is a distance from an object plane side vertex of the th lens of the optical system to the image plane, and EFL is an effective focal length of the optical system.
  3. 3. The high pixel infrared optical system of claim 1, wherein the th lens and the second lens are cemented together to form a combined lens.
  4. 4. The high-pixel infrared optical system according to claim 1, wherein a stop of the optical system is located between the second lens and the third lens and near the second lens side.
  5. 5. The high pixel angular infrared optical system of claim 1, 2, 3, or 4, wherein each lens of the optical system satisfies the following condition:
    (1)-10<f1<-3；
    (2)2<f2<5；
    (3)3<f3<10；
    (4)-270<f4<100；
    wherein f1 is the focal length of the th lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, and/or
    Each lens of the optical system satisfies the following condition:
    (1)-3.0<f1/f<-1.0；
    (2)0.5<f2/f<3.0；
    (3)0.5<f3/f<3.0；
    (4)-50.0<f4/f<20；
    where f is the focal length of the entire optical system, f1 is the focal length of the th lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, and f4 is the focal length of the fourth lens.
  6. 6. The high-pixel infrared optical system as defined in claim 1, 2, 3 or 4, wherein the material refractive index Nd1 and the material Abbe constant Vd1 of the -th lens satisfy 1.40< Nd1<1.70 and 50< Vd1< 90.
  7. 7. The high-pixel -angle infrared optical system according to claim 1, 2, 3 or 4, wherein the refractive index Nd2 and Abbe constant Vd2 of the material of the second lens satisfy 1.85< Nd2<2.05 and 20< Vd2< 40.
  8. 8. The high-pixel -angle infrared optical system according to claim 1, 2, 3 or 4, wherein the refractive index Nd3 and the Abbe constant Vd3 of the material of the third lens satisfy 1.50< Nd3<1.70 and 20< Vd3< 40.
  9. 9. The high-pixel -angle infrared optical system according to claim 1, 2, 3 or 4, wherein the refractive index Nd4 and Abbe constant Vd4 of the material of the fourth lens satisfy 1.50< Nd4<1.70 and 20< Vd4< 40.
  10. 10, kinds of camera module, including at least optical lens, characterized in that, the high pixel infrared optical system of any of claim 1-9 is installed in the optical lens.
CN201911044152.0A 2019-10-30 2019-10-30 High-pixel infrared optical system and camera module applying same Pending CN110737074A (en)

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PCT/CN2019/126529 WO2021082223A1 (en) 2019-10-30 2019-12-19 High-pixel infrared optical system and applied camera module thereof

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CN113534419A (en) * 2021-09-15 2021-10-22 宁波永新光学股份有限公司 Clear on-vehicle optical imaging lens of superelevation

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JP4533441B2 (en) * 2008-03-13 2010-09-01 株式会社日立製作所 Aberration correction device for correcting spherical aberration of charged particle device
CN108445608B (en) * 2018-05-25 2023-08-22 广东弘景光电科技股份有限公司 High-pixel wide-angle infrared optical system and camera module applying same
CN208596251U (en) * 2018-07-25 2019-03-12 广东弘景光电科技股份有限公司 Wide-angle optics and its camera module of application
CN108897121A (en) * 2018-08-31 2018-11-27 广东弘景光电科技股份有限公司 Small size wide-angle optics and its camera module of application
CN109975954A (en) * 2019-04-04 2019-07-05 广东弘景光电科技股份有限公司 High pixel road monitoring optical system and its camera module of application
CN110333595B (en) * 2019-06-24 2020-11-27 江西联益光学有限公司 Imaging lens system

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