CN212873034U - High-pixel infrared optical system and camera module applying same - Google Patents
High-pixel infrared optical system and camera module applying same Download PDFInfo
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- CN212873034U CN212873034U CN201921843982.5U CN201921843982U CN212873034U CN 212873034 U CN212873034 U CN 212873034U CN 201921843982 U CN201921843982 U CN 201921843982U CN 212873034 U CN212873034 U CN 212873034U
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Abstract
The embodiment of the utility model discloses high pixel infrared optical system includes from the object plane to image plane along the optical axis in proper order: a first lens, a second lens, a third lens, and a fourth lens; the object surface side of the first lens is a convex surface, the image surface side of the first lens is a concave surface, and the focal power of the first 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, 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. On the other hand, the embodiment of the utility model provides a still provide a camera module. The optical system and the camera module of the embodiment of the utility model 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.
Description
The technical field is as follows:
the utility model relates to an optical system and the module of making a video recording of using thereof, especially a high pixel infrared optical system and the module of making a video recording of using thereof.
Background art:
with the application of infrared imaging technology and the development of intelligent driving assistance systems, infrared lenses are increasingly widely applied to the field of vehicles. However, the traditional infrared lens has the problems of more lenses and complex structure.
The invention content is as follows:
there is lens in large quantity, problem with high costs for overcoming traditional infrared camera lens, the embodiment of the utility model provides a high pixel infrared optical system.
A high-pixel infrared optical system sequentially comprises the following components from an object plane to an image plane along an optical axis: a first lens, a second lens, a third lens, and a fourth lens;
the object surface side of the first lens is a convex surface, the image surface side of the first lens is a concave surface, and the focal power of the first 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, 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.
On the other hand, the embodiment of the utility model provides a still provide a camera module.
A camera module at least comprises an optical lens, and the high-pixel infrared optical system is installed in the optical lens.
The optical system and the camera module of the embodiment of the utility model 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 described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an optical system or a camera module according to the present invention;
fig. 2 is a distortion curve diagram of the optical system or camera module of the present invention at +25 ℃;
fig. 3 is a MTF curve at +25 ℃ of the optical system or camera module of the present invention;
fig. 4 is a diagram of the relative illuminance at +25 ℃ of the optical system or camera module of the present invention;
FIG. 5 is a graph of MTF at-40 ℃ for an optical system or camera module of the present invention;
fig. 6 is a MTF curve at +85 ℃ of the optical system or camera module of the present invention;
fig. 7 is a 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 problem, technical solution and advantageous effects solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to further explain the present invention in detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
When embodiments of the present invention refer to the ordinal numbers "first", "second", etc., it should be understood that the terms are used for distinguishing only when they do express the ordinal order in context.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The embodiment of the utility model provides a high pixel infrared optical system includes from the object plane to image plane along the optical axis in proper order: a first lens 1, a second lens 2, a third lens 3, and a fourth lens 4.
The object surface side of the first lens 1 is a convex surface, the image surface side is a concave surface, and the focal power 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 present 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.
Illustratively, as a specific embodiment of the present solution, but not by way of limitation, as shown in fig. 1, the object surface side of the first lens 1 in the present embodiment is a convex surface, the image surface side is a concave surface, and the optical 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 convex, the image surface side is concave, and the refractive power thereof is positive.
Illustratively, as a specific embodiment of the present solution, but not by way of limitation, as shown in fig. 7, the object surface side of the first lens 1 in the present embodiment is a convex surface, the image surface side is a concave surface, and the optical 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 fourth lens element 4 has a convex object surface side and a concave image surface side, and has negative refractive power.
Further, as a preferred embodiment of the present solution, but not limited thereto, the optical system satisfies TTL/EFL ≦ 1.79, where TTL is the distance between the object plane side vertex of the first lens 1 of the optical system and the imaging plane 6, and EFL is the effective focal length of the optical system. 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.
Still further, as a preferred embodiment of the present invention, but not limited thereto, the first lens and the second lens are cemented to each other to form a combined lens. The structure is simple and compact, different lenses are mutually combined and the focal power is reasonably distributed, so that good optical performance can be ensured.
Still further, as a preferred embodiment of the present invention, but not limited thereto, 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；
where f1 is the focal length of the first 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. Through the mutual combination of different lenses and the reasonable distribution of focal power, the optical system has good performances of large aperture, small distortion, high pixel, good athermal difference elimination and the like.
Further, as a preferred embodiment of the present invention, but not limited thereto, each lens of the optical system satisfies the following conditions:
(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；
where f is the focal length of the entire optical system, f1 is the focal length of the first 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. Through the mutual combination of different lenses and the reasonable distribution of focal power, the optical system has good performances of large aperture, small distortion, high pixel, good athermal difference elimination and the like.
Still further, as a preferred embodiment of the present invention, but not limited thereto, the refractive index Nd1 of the material and the abbe constant Vd1 of the first lens 1 satisfy: 1.40< Nd1<1.70, 50< Vd1< 90. Simple structure, can guarantee good optical property.
Still further, as a preferred embodiment of the present invention, but not limited thereto, the refractive index Nd2 of the material and the abbe constant Vd2 of the second lens 2 satisfy: 1.85< Nd2<2.05, 20< Vd2< 40. Simple structure, can guarantee good optical property.
Further, as a preferred embodiment of the present solution, but not limited thereto, the refractive index Nd3 of the material and the abbe constant Vd3 of the material of the third lens 3 satisfy: 1.50< Nd3<1.70, 20< Vd3< 40. Simple structure, can guarantee good optical property.
Still further, as a preferred embodiment of the present invention, but not limited thereto, the refractive index Nd4 of the material and the abbe constant Vd4 of the material of the fourth lens 4 satisfy: 1.50< Nd4<1.70, 20< Vd4< 40. Simple structure, can guarantee good optical property.
Further, as a specific embodiment of the present solution, but not limiting, 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, a diaphragm 5 is disposed on the object side of the second lens 2, and the positions of the respective lenses and diaphragms are fixed in this embodiment.
Further, as a preferred embodiment of the present invention, but not limited thereto, the third lens 3 and the fourth lens 4 are plastic aspherical lenses. The method can effectively eliminate the influence of the spherical aberration on the performance of the lens, improve the resolving power of the optical lens, effectively realize the heat difference elimination, and simultaneously reduce the processing difficulty and the production cost of the lens.
Still further, as a preferred embodiment of the present invention, but not limited thereto, a band pass filter is provided between the fourth lens 4 and the image plane 6. The visible light in the environment can be filtered to avoid the visible light interference phenomenon.
Specifically, referring to fig. 1, in the present embodiment, the focal length f1 of the first 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 67.417 mm. In the present embodiment, in the optical axis direction, a thickness value D1 from the vertex on the object plane side of the first lens element 1 to the vertex on the image plane side thereof, a thickness value D2 from the vertex on the object plane side of the second lens element 2 to the vertex on the image plane side thereof, and an interval D3 from the vertex on the image plane side of the second lens element 2 to the vertex on the object plane side of the third lens element 3 satisfy: d1+ D2< D3. The basic parameters of the optical system are shown in the following table:
in the above table, S1, S2 correspond to two surfaces of the first lens 1 from the object plane to the image plane along the optical axis; s2, S3 correspond to both surfaces of the second lens 2; STO is where the diaphragm is located; s5, S6 correspond to both surfaces of the third lens 3; s7, S8 correspond to both surfaces of the fourth lens 4; s9, S10 correspond to both surfaces of the bandpass filter; 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:
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 a6The coefficients are respectively corresponding to the radial coordinates. 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.
A camera module at least comprises an optical lens, and the high-pixel infrared optical system is installed in the optical lens.
The optical system and the camera module of the embodiment of the utility model 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.
The foregoing is illustrative of one or more embodiments provided in connection with the detailed description and is not to be construed as limiting the invention to the precise embodiments disclosed herein. All with the utility model discloses a method, structure etc. are similar, the same, or to the utility model discloses make a plurality of technological deductions or replacement under the design prerequisite, all should regard as the utility model discloses a protection scope.
Claims (10)
1. A high-pixel infrared optical system sequentially comprises the following components from an object plane to an image plane along an optical axis: a first lens, a second lens, a third lens, and a fourth lens; it is characterized in that the preparation method is characterized in that,
the object surface side of the first lens is a convex surface, the image surface side of the first lens is a concave surface, and the focal power of the first 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, 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. The high pixel infrared optical system of claim 1, wherein the optical system satisfies TTL/EFL ≦ 1.79, where TTL is a distance between an object plane side vertex of the first lens of the optical system and the image plane, and EFL is an effective focal length of the optical system.
3. The high-pixel infrared optical system of claim 1, wherein the first lens and the second lens are cemented to each other to form a combined lens.
4. The high-pixel infrared optical system of claim 1, wherein the optical stop of the optical system is located between the second lens and the third lens and near a side of the second lens.
5. The high pixel infrared optical system of claims 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 first 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; 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 first 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. The high-pixel infrared optical system as defined in claim 1, 2, 3 or 4, wherein the refractive index Nd1 of the material and the abbe constant Vd1 of the material of the first lens satisfy: 1.40< Nd1<1.70, 50< Vd1< 90.
7. The high-pixel infrared optical system as defined in claim 1, 2, 3 or 4, wherein the refractive index Nd2 of the material and the Abbe constant Vd2 of the material of the second lens satisfy: 1.85< Nd2<2.05, 20< Vd2< 40.
8. The high-pixel infrared optical system as defined in claim 1, 2, 3 or 4, wherein the refractive index Nd3 of the material and the abbe constant Vd3 of the material of the third lens satisfy: 1.50< Nd3<1.70, 20< Vd3< 40.
9. The high-pixel infrared optical system as defined in claim 1, 2, 3 or 4, wherein the refractive index Nd4 of the material and the Abbe constant Vd4 of the material of the fourth lens satisfy: 1.50< Nd4<1.70, 20< Vd4< 40.
10. A camera module comprising at least an optical lens, wherein the high pixel infrared optical system of any one of claims 1 to 9 is mounted in the optical lens.
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