CN111045197A - High-definition wide-angle day and night confocal optical system and camera module applying same - Google Patents
High-definition wide-angle day and night confocal optical system and camera module applying same Download PDFInfo
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- CN111045197A CN111045197A CN201911420784.2A CN201911420784A CN111045197A CN 111045197 A CN111045197 A CN 111045197A CN 201911420784 A CN201911420784 A CN 201911420784A CN 111045197 A CN111045197 A CN 111045197A
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Abstract
The embodiment of the invention discloses a high-definition wide-angle day and night confocal optical system, which 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, a fourth lens, a fifth lens, a sixth lens, and a seventh 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 concave surface, the image surface side is a convex surface, and the focal power of the second lens is positive; the third lens is a biconvex lens, and the focal power of the third lens is positive; the fourth lens is a biconcave lens, and the focal power of the fourth lens is negative; the image surface side of the fifth lens is a convex surface, and the focal power of the fifth lens is positive; the sixth lens is a biconvex lens, and the focal power of the sixth lens is positive; the seventh lens element has a concave object surface side and a convex image surface side, and has negative refractive power. On the other hand, the embodiment of the invention also provides a camera module. The embodiment of the invention is composed of 7 lenses, the number of the lenses is reasonable, and the structure is simple; the optical fiber has the good performances of day and night confocal, large visual angle, high pixel, good heat elimination difference and the like.
Description
The technical field is as follows:
the invention relates to an optical system and a camera module applied by the same, in particular to a high-definition wide-angle day and night confocal optical system and a camera module applied by the same.
Background art:
with the development of scientific technology, the high-definition wide-angle day and night confocal optical system or the camera module can observe a wider space range due to a large visual angle, and can ensure that the high-definition wide-angle day and night confocal optical system or the camera module can effectively work under the conditions of day and night, so that the high-definition wide-angle day and night confocal optical system or the camera module is widely applied to the field of automobiles and the field of assistant driving. However, the number of lenses is large, and the structure is complicated.
The invention content is as follows:
in order to overcome the problems of a large number of lenses and a complex structure of the conventional optical system or camera module, the embodiment of the invention provides a high-definition wide-angle day and night confocal optical system on the one hand.
A high-definition wide-angle day and night confocal 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, a fourth lens, a fifth lens, a sixth lens, and a seventh 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 concave surface, the image surface side is a convex surface, and the focal power of the second lens is positive;
the object surface side of the third lens is a convex surface, the image surface side is a convex surface, and the focal power of the third lens is positive;
the object surface side of the fourth lens is a concave surface, the image surface side of the fourth lens is a concave surface, and the focal power of the fourth lens is negative;
the image surface side of the fifth lens is a convex surface, and the focal power of the fifth lens is positive;
the object surface side of the sixth lens is a convex surface, the image surface side is a convex surface, and the focal power of the sixth lens is positive;
the seventh lens element has a concave object surface side and a convex image surface side, and has negative refractive power.
On the other hand, the embodiment of the invention also provides a camera module.
The utility model provides a module of making a video recording, includes optical lens at least, installs the aforesaid in the optical lens high definition wide angle day night confocal optical system.
The optical system and the camera module of the embodiment of the invention mainly comprise 7 lenses, the number of the lenses is reasonable, and the structure is simple; different lenses are combined with each other and the focal power is reasonably distributed, so that the confocal optical lens has good performances of day and night confocal performance, large visual angle, high pixel, good heat difference elimination and the like.
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 some 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 first schematic structural diagram of an optical system or a camera module according to an embodiment of the present invention;
FIG. 2 is a distortion curve at +25 ℃ for an embodiment of an optical system or camera module of the present invention;
FIG. 3 is a graph of MTF at +25 ℃ for an embodiment of an optical system or camera module of the present invention;
FIG. 4 is a diagram of relative illumination at +25 ℃ for an embodiment of an 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 embodiment of the present invention;
FIG. 6 is a graph of MTF at +85 ℃ for an embodiment of 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 an embodiment of the present invention;
fig. 8 is a third schematic structural diagram of an optical system or a camera module according to an embodiment of the present invention.
The specific implementation mode is as follows:
in order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. 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 words are used for distinguishing between them unless the context clearly dictates otherwise.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, an embodiment of the present invention provides a high-definition wide-angle day and night confocal optical system, which sequentially includes, from an object plane to an image plane 9 along an optical axis: a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, and a seventh lens 7.
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 concave surface, the image surface side is a convex surface, and the focal power is positive;
the object surface side of the third lens 3 is a convex surface, the image surface side is a convex surface, and the focal power is positive;
the object plane side of the fourth lens 4 is a concave surface, the image plane side is a concave surface, and the focal power is negative;
the fifth lens element 5 has a convex object surface side and a convex image surface side, and has positive focal power;
the object surface side of the sixth lens element 6 is a convex surface, the image surface side is a convex surface, and the focal power thereof is positive;
the seventh lens element 7 has a concave object surface side and a convex image surface side, and has negative refractive power.
The optical system of the embodiment of the invention mainly comprises 7 lenses, the number of the lenses is reasonable, and the structure is simple; different lenses are combined with each other and the focal power is reasonably distributed, so that the confocal optical lens has good performances of day and night confocal performance, large visual angle, high pixel, good heat difference elimination and the like.
Further, as another preferred embodiment of the present invention, without limitation, as shown in fig. 7,
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 concave surface, the image surface side is a convex surface, and the focal power is positive;
the object surface side of the third lens 3 is a convex surface, the image surface side is a convex surface, and the focal power is positive;
the object plane side of the fourth lens 4 is a concave surface, the image plane side is a concave surface, and the focal power is negative;
the object plane side of the fifth lens 5 is a plane, the image plane side is a convex surface, and the focal power of the fifth lens is positive;
the object surface side of the sixth lens element 6 is a convex surface, the image surface side is a convex surface, and the focal power thereof is positive;
the seventh lens element 7 has a concave object surface side and a convex image surface side, and has negative refractive power.
Still further, as another preferred embodiment of the present invention, without limitation, as shown in figure 8,
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 concave surface, the image surface side is a convex surface, and the focal power is positive;
the object surface side of the third lens 3 is a convex surface, the image surface side is a convex surface, and the focal power is positive;
the object plane side of the fourth lens 4 is a concave surface, the image plane side is a concave surface, and the focal power is negative;
the fifth lens 5 has a concave object surface side and a convex image surface side, and has positive focal power;
the object surface side of the sixth lens element 6 is a convex surface, the image surface side is a convex surface, and the focal power thereof is positive;
the seventh lens element 7 has a concave object surface side and a convex image surface side, and has negative refractive power.
Further, as a preferred embodiment of the present invention, but not limited thereto, the fifth lens 5 is an aspheric lens, the sixth lens 6 and the seventh lens 7 are cemented together to form a combined lens, and the optical system satisfies TTL/EFL ≦ 6.50, where TTL is a distance between an object plane side vertex of the first lens 1 of the optical system and the image plane 9, and EFL is an effective focal length of the optical system. The structure is simple and compact, and good optical performance can be ensured.
Still further, as a preferred embodiment of the present invention, but not limited thereto, the combination lens satisfies the following condition: 3.5< f67<15, where f67 is the focal length of the sixth lens 6 and the seventh lens 7 combined with each other. Simple structure and can ensure good optical performance.
Still further, as a preferred embodiment of the present invention, but not limited thereto, each lens of the present optical system satisfies the following condition:
(1)-15<f1<-2；
(2)100<f2<1000；
(3)5<f3<15；
(4)-15<f4<-2；
(5)2<f5<15；
(6)2<f6<15；
(7)-20<f7<-2；
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, f4 is the focal length of the fourth lens 4, f5 is the focal length of the fifth lens 5, f6 is the focal length of the sixth lens 6, and f7 is the focal length of the seventh lens 7. Through the mutual combination of different lenses and the reasonable distribution of focal power, the optical system has good performances such as large aperture, large visual angle, high pixel and very good athermal difference.
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)-5.0<f1/f<-0.5；
(2)50<f2/f<500；
(3)0.5<f3/f<5.0；
(4)-5.0<f4/f<-0.5；
(5)0.5<f5/f<5.0；
(6)0.5<f6/f<5.0；
(7)-0.5<f7/f<-5.0；
where f is a focal length of the entire optical system, f1 is a focal length of the first lens 1, f2 is a focal length of the second lens 2, f3 is a focal length of the third lens 3, f4 is a focal length of the fourth lens 4, f5 is a focal length of the fifth lens 5, f6 is a focal length of the sixth lens 6, and f7 is a focal length of the seventh lens 7. Through the mutual combination of different lenses and the reasonable distribution of focal power, the optical system has good performances such as large aperture, large visual angle, high pixel and very good athermal difference.
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: 1.60< Nd1<1.85, 35< Vd1< 55. Simple structure and can ensure good optical performance.
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: 1.70< Nd2<1.95, 25< Vd2< 55. Simple structure and can ensure good optical performance.
Further, as a preferred embodiment of the present invention, 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: 1.60< Nd3<1.85, 35< Vd3< 55. Simple structure and can ensure good optical performance.
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: 1.55< Nd4<1.75, 25< Vd4< 50. Simple structure and can ensure good optical performance.
Still further, as a preferred embodiment of the present invention, but not limited thereto, the fifth lens 5 has a refractive index Nd5 of a material and an abbe constant Vd5 of a material satisfying: 1.45< Nd5<1.65, 60< Vd5< 95. Simple structure and can ensure good optical performance.
Further, as a preferred embodiment of the present invention, but not limited thereto, the refractive index Nd6 of the material and the abbe constant Vd6 of the material of the sixth lens 6 satisfy: 1.45< Nd6<1.65, 60< Vd6< 95. Simple structure and can ensure good optical performance.
Still further, as a preferred embodiment of the present invention, but not limited thereto, the seventh lens 7 has a refractive index Nd7 of material and an abbe constant Vd7 of material satisfying: 1.75< Nd7<2.05, 15< Vd7< 40. Simple structure and can ensure good optical performance.
Still further, as a preferred embodiment of the present invention, but not limited thereto, the fifth lens 5 is a glass aspherical lens. Simple structure and can ensure good optical performance.
Further, as a preferred embodiment of the present invention, but not limiting, the diaphragm 8 of the optical system is located between the second lens 2 and the third lens 3. For adjusting the intensity of the light beam.
Still further, as a preferred embodiment of the present invention, but not limited thereto, a dual-pass filter is disposed between the seventh lens 7 and the image plane 9, and allows visible light and specified infrared light waves to pass through.
Specifically, 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 9 along the optical axis; s3, S4 correspond to both surfaces of the second lens 2; s5 is stop STO; s6, S7 correspond to both surfaces of the third lens 3; s8, S9 correspond to both surfaces of the fourth lens 4; s10, S11 correspond to both surfaces of the fifth lens 5; s12, S13 correspond to both surfaces of the sixth lens 6; s13, S14 correspond to both surfaces of the seventh lens 7; s15 and S16 correspond to two surfaces of the double-wave-pass filter; IMA is the image plane 9.
Still further, as a preferred embodiment of the present invention, but not limited thereto, the surface of the fifth lens 5 is an aspherical shape, which satisfies 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 a8The coefficients are respectively corresponding to the radial coordinates. The aspheric correlation values of the fifth lens 5 are shown in the following table:
as can be seen from fig. 2 to 6, the optical system of the present embodiment has good performances of day and night confocal, large viewing angle, high pixel, and very good athermal property.
The utility model provides a module of making a video recording, includes optical lens at least, installs the aforesaid in the optical lens high definition wide angle day night confocal optical system.
The camera module of the embodiment of the invention mainly comprises 7 lenses, the number of the lenses is reasonable, and the structure is simple; different lenses are combined with each other and the focal power is reasonably distributed, so that the confocal optical lens has good performances of day and night confocal performance, large visual angle, high pixel, good heat difference elimination and the like.
The foregoing is illustrative of one or more embodiments provided in connection with the detailed description and is not intended to limit the practice of the invention to the particular forms disclosed. Similar or identical methods, structures and the like as those of the present invention or several technical deductions or substitutions made on the premise of the conception of the present invention should be considered as the protection scope of the present invention.
Claims (9)
1. A high-definition wide-angle day and night confocal 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, a fourth lens, a fifth lens, a sixth lens, and a seventh 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 concave surface, the image surface side is a convex surface, and the focal power of the second lens is positive;
the object surface side of the third lens is a convex surface, the image surface side is a convex surface, and the focal power of the third lens is positive;
the object surface side of the fourth lens is a concave surface, the image surface side of the fourth lens is a concave surface, and the focal power of the fourth lens is negative;
the image surface side of the fifth lens is a convex surface, and the focal power of the fifth lens is positive;
the object surface side of the sixth lens is a convex surface, the image surface side is a convex surface, and the focal power of the sixth lens is positive;
the seventh lens element has a concave object surface side and a convex image surface side, and has negative refractive power.
2. The high-definition wide-angle day and night confocal optical system of claim 1, wherein the sixth lens and the seventh lens are cemented together to form a combined lens, and a focal length f67 of the combined lens satisfies the following condition: 3.5< f67< 15.
3. The high-definition wide-angle day and night confocal optical system of claim 1, wherein the optical system satisfies TTL/EFL ≦ 6.50, where TTL is a distance from an object plane side vertex of the first lens of the optical system to the image plane, and EFL is an effective focal length of the optical system.
4. The high-definition wide-angle day and night confocal optical system of claim 1, wherein each lens of the optical system satisfies the following condition:
(1)-15<f1<-2；
(2)100<f2<1000；
(3)5<f3<15；
(4)-15<f4<-2；
(5)2<f5<15；
(6)2<f6<15；
(7)-20<f7<-2；
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, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, and f7 is the focal length of the seventh lens.
5. The high-definition wide-angle day and night confocal optical system of claim 1, wherein each lens of the optical system satisfies the following condition:
(1)-5.0<f1/f<-0.5；
(2)50<f2/f<500；
(3)0.5<f3/f<5.0；
(4)-5.0<f4/f<-0.5；
(5)0.5<f5/f<5.0；
(6)0.5<f6/f<5.0；
(7)-0.5<f7/f<-5.0；
where f is a focal length of the entire optical system, f1 is a focal length of the first lens, f2 is a focal length of the second lens, f3 is a focal length of the third lens, f4 is a focal length of the fourth lens, f5 is a focal length of the fifth lens, f6 is a focal length of the sixth lens, and f7 is a focal length of the seventh lens.
6. The high-definition wide-angle day-night confocal optical system of claim 1, wherein the fifth lens is a glass aspheric lens.
7. The high-definition wide-angle day-night confocal optical system of claim 1, wherein a stop of the optical system is located between the second lens and the third lens.
8. The high-definition wide-angle day and night confocal optical system as claimed in any one of claims 1 to 7, wherein the refractive index Nd1 of the material and the Abbe constant Vd1 of the material of the first lens satisfy: 1.60< Nd1<1.85, 35< Vd1< 55; and/or
The refractive index Nd2 of the material of the second lens and the Abbe constant Vd2 of the material satisfy that: 1.70< Nd2<1.95, 25< Vd2< 55; and/or
The refractive index Nd3 of the material and the Abbe constant Vd3 of the material of the third lens satisfy that: 1.60< Nd3<1.85, 35< Vd3< 55; and/or
The refractive index Nd4 of the material and the Abbe constant Vd4 of the material of the fourth lens satisfy that: 1.55< Nd4<1.75, 25< Vd4< 50; and/or
The refractive index Nd5 of the material of the fifth lens and the Abbe constant Vd5 of the material satisfy that: 1.45< Nd5<1.65, 60< Vd5< 95; and/or
The refractive index Nd6 of the material and the Abbe constant Vd6 of the material of the sixth lens 6 satisfy that: 1.45< Nd6<1.65, 60< Vd6< 95; and/or
The refractive index Nd7 of the material and the Abbe constant Vd7 of the seventh lens 7 satisfy the following conditions: 1.75< Nd7<2.05, 15< Vd7< 40.
9. A camera module, comprising at least an optical lens, wherein the high-definition wide-angle day and night confocal optical system as claimed in any one of claims 1 to 8 is installed in the optical lens.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109991719A (en) * | 2019-03-18 | 2019-07-09 | 广东弘景光电科技股份有限公司 | High definition wide-angle day and night confocal optical system and its camera module of application |
| CN114035302A (en) * | 2021-10-23 | 2022-02-11 | 广东弘景光电科技股份有限公司 | Small-size ultra-wide-angle day and night dual-purpose optical system |
| CN114609762A (en) * | 2022-03-19 | 2022-06-10 | 广东弘景光电科技股份有限公司 | Small-size large-wide-angle optical system and camera module applying same |
-
2019
- 2019-12-31 CN CN201911420784.2A patent/CN111045197A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109991719A (en) * | 2019-03-18 | 2019-07-09 | 广东弘景光电科技股份有限公司 | High definition wide-angle day and night confocal optical system and its camera module of application |
| CN114035302A (en) * | 2021-10-23 | 2022-02-11 | 广东弘景光电科技股份有限公司 | Small-size ultra-wide-angle day and night dual-purpose optical system |
| CN114035302B (en) * | 2021-10-23 | 2024-05-03 | 广东弘景光电科技股份有限公司 | Small-volume ultra-wide angle day and night dual-purpose optical system |
| CN114609762A (en) * | 2022-03-19 | 2022-06-10 | 广东弘景光电科技股份有限公司 | Small-size large-wide-angle optical system and camera module applying same |
| CN114609762B (en) * | 2022-03-19 | 2024-05-03 | 广东弘景光电科技股份有限公司 | Small-volume large-wide-angle optical system and camera module applying same |
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