CN108427184B - Co-coking large target surface depth imaging optical system and camera module applied by same - Google Patents
Co-coking large target surface depth imaging optical system and camera module applied by same Download PDFInfo
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- CN108427184B CN108427184B CN201810422458.4A CN201810422458A CN108427184B CN 108427184 B CN108427184 B CN 108427184B CN 201810422458 A CN201810422458 A CN 201810422458A CN 108427184 B CN108427184 B CN 108427184B
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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
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
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Abstract
The embodiment of the invention discloses a confocal large target surface depth imaging optical system, which sequentially comprises the following components from an object surface to an image surface along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. The object plane sides of the first lens and the second lens are both convex, the image plane sides are both concave, and the focal power of the first lens and the second lens is negative; the object plane side of the third lens is a convex surface, the image plane 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 concave surface, the image plane side is a concave surface, and the focal power of the fourth lens is negative; the object plane side of the fifth lens is a convex surface, the image plane side is a convex surface, and the focal power of the fifth lens is positive; the object plane side of the sixth lens is a convex surface, the image plane side is a convex surface, and the focal power of the sixth lens is positive; wherein the fourth lens and the fifth lens are glued to each other to form a combined lens. On the other hand, the embodiment of the invention also provides a camera module. The optical system and the camera module of the embodiment of the invention mainly comprise 6 lenses, and have simple structure.
Description
Technical field:
the present invention relates to an optical system and a camera module using the same, and more particularly, to an optical system and a camera module used in industrial and 3D cameras.
The background technology is as follows:
the existing optical system or camera module suitable for industrial and 3D cameras has the problem of complex structure.
The invention comprises the following steps:
in order to solve the problem that an optical system or a camera module which is conventionally applied to industrial and 3D cameras is generally complex in structure, the embodiment of the invention provides a confocal large-target-surface depth imaging optical system.
A confocal large target surface depth imaging optical system sequentially comprises, along an optical axis from an object surface to an image surface: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens.
The object plane side of the first lens is a convex surface, the image plane side is a concave surface, and the focal power of the first lens is negative;
the object plane side of the second lens is a convex surface, the image plane side is a concave surface, and the focal power of the second lens is negative;
the object plane side of the third lens is a convex surface, the image plane 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 concave surface, the image plane side is a concave surface, and the focal power of the fourth lens is negative;
the object plane side of the fifth lens is a convex surface, the image plane side is a convex surface, and the focal power of the fifth lens is positive;
the object plane side of the sixth lens is a convex surface, the image plane side is a convex surface, and the focal power of the sixth lens is positive;
wherein the fourth lens and the fifth lens are glued to each other to form a combined lens.
On the other hand, the embodiment of the invention also provides a camera module.
The camera module at least comprises an optical lens, wherein the confocal large-target-surface depth imaging optical system is arranged in the optical lens.
The optical system and the camera module of the embodiment of the invention mainly comprise 6 lenses, and have simple structure; different lenses are combined with each other and optical power is reasonably distributed, so that the lens has good optical properties of day-night confocal, large target surface, large aperture, large-angle depth imaging and the like, and is suitable for industrial and 3D depth imaging cameras.
Description of the drawings:
in order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an optical system or lens according to the present invention;
FIG. 2 is a graph of field curvature and distortion of an optical system or lens of the present invention;
FIG. 3 is a graph of MTF under visible light for an optical system or lens of the present invention;
fig. 4 is a graph of MTF at 850nm for an optical system or lens of the present invention.
The specific embodiment is as follows:
in order to make the technical problems, technical schemes and beneficial effects solved by the invention more clear, the 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 for purposes of illustration only and are not intended to limit the scope of the invention.
When embodiments of the present invention refer to the ordinal terms "first," "second," etc., it is to be understood that they are merely used for distinguishing between them unless the order of their presentation is indeed dependent on the context.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1, an embodiment of the present invention provides a confocal large-target-surface-depth imaging optical system, which sequentially includes, along an optical axis from an object surface to an image surface 8: a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, and a sixth lens 6.
The object plane side of the first lens 1 is a convex surface, the image plane side is a concave surface, and the focal power of the first lens is negative;
the object plane side of the second lens 2 is a convex surface, the image plane side is a concave surface, and the focal power of the second lens is negative;
the object plane side of the third lens 3 is a convex surface, the image plane side is a convex surface, and the focal power of the third lens 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 of the fourth lens is negative;
the object plane side of the fifth lens 5 is a convex surface, the image plane side is a convex surface, and the focal power thereof is positive;
the object plane side of the sixth lens element 6 is convex, the image plane side is convex, and the focal power thereof is positive;
wherein the fourth lens 4 and the fifth lens 5 are cemented with each other to form a combined lens.
The optical system and the camera module of the embodiment of the invention mainly comprise 6 lenses, and have simple structure; different lenses are combined with each other and optical power is reasonably distributed, so that the lens has good optical properties of day-night confocal, large target surface, large aperture, large-angle depth imaging and the like, and is suitable for industrial and 3D depth imaging cameras.
Further, as a preferred embodiment of the present embodiment, not limiting, the focal length f45 of the combined lens and the focal length f of the entire optical system satisfy: 0<f/f45<0.13. Different lenses are combined with each other and optical power is reasonably distributed, so that the lens has good optical properties of day-night confocal, large target surface, large aperture, large angle depth imaging and the like.
Still further, as a specific embodiment of the present embodiment, not limiting, the optical system satisfies the following condition:
(1)-0.31<f/f1<-0.25；
(2)-0.40<f/f2<-0.34；
(3)0.43<f/f3<0.51；
(4)0<f/f45<0.13；
(5)0.29<f/f6<0.36；
wherein 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, f45 is the focal length of the combined lens, f6 is the focal length of the sixth lens 6, and f is the focal length of the entire optical system. Different lenses are combined with each other and optical power is reasonably distributed, so that the lens has good optical properties of day-night confocal, large target surface, large aperture, large angle depth imaging and the like.
Still further, as a preferred embodiment of the present embodiment, not limiting, the material refractive index Nd1, the material abbe constant Vd1 of the first lens 1 satisfy: nd1 is more than 1.80, and Vd1 is less than 50. The structure is simple, and good optical performance can be ensured.
Further, as a preferred embodiment of the present embodiment, not limited thereto, the refractive index Nd2 of the material of the second lens 2, the abbe constant Vd2 of the material satisfy: nd2 is less than 1.56, and Vd2 is more than 55. The structure is simple, and good optical performance can be ensured.
Still further, as a preferred embodiment of the present embodiment, not limiting, the refractive index Nd3 of the material of the third lens 3, the abbe constant Vd3 of the material satisfy: nd3 is more than 1.90, and Vd3 is less than 36. The structure is simple, and good optical performance can be ensured.
Still further, as a preferred embodiment of the present embodiment, not limiting, the material refractive index Nd4, the material abbe constant Vd4 of the fourth lens 4 satisfy: nd4 is more than 1.92, and Vd4 is less than 20. The structure is simple, and good optical performance can be ensured.
Further, as a preferred embodiment of the present embodiment, not limited thereto, the refractive index Nd5 of the material of the fifth lens 5, the abbe constant Vd5 of the material satisfy: nd5 is more than 1.80, and Vd5 is less than 50. The structure is simple, and good optical performance can be ensured.
Still further, as a preferred embodiment of the present embodiment, not limiting, the refractive index Nd6 of the material of the sixth lens 6, the abbe constant Vd6 of the material satisfy: nd6 is less than 1.56, and Vd6 is more than 55. The structure is simple, and good optical performance can be ensured.
Still further, as a specific embodiment of the present embodiment, not limiting, the aperture stop 7 is located between the third lens 3 and the fourth lens 4, near the third lens 3 side. The structure is simple, and the device is used for adjusting the intensity of the light beam.
Further, as a specific embodiment of the present invention, but not limited to, the second lens 2 and the sixth lens 6 are plastic aspherical lenses. The glass-plastic mixed structure is used, so that the cost is reduced and the performance of the lens is optimized.
Specifically, in this embodiment, the present optical system matches a 3D sensor of 1/2.3 inches, focal length f=3.33 mm, f/no=1.3, dfov=130 °, ttl=25.8 mm. The basic parameters of the optical system are shown in the following table:
in the table, S1 and S2 are two surfaces of the first lens 1 along the optical axis from the object plane to the image plane; s3 and S4 correspond to two surfaces of the second lens 2; s5 and S6 correspond to two surfaces of the third lens 3; STO is the diaphragm; s8 and S9 correspond to two surfaces of the fourth lens 4; s9 and S10 correspond to two surfaces of the fifth lens 5; s11 and S12 correspond to two surfaces of the sixth lens 6; s13 is an object-plane-side surface of the bandpass filter located between the sixth lens 6 and the image plane 8.
More specifically, the surfaces of the second lens 2 and the sixth lens 6 are aspherical in shape, which satisfies the following equation:
| K | α 1 | α 2 | α 3 | α 4 | α 5 | α 6 | |
| S3 | -77.7531 | 0 | 0.001293 | -2.154E-03 | 8.645E-05 | -1.737E-06 | 1.151E-08 |
| S4 | -0.5600 | 0 | 0.001480 | -1.044E-03 | -1.053E-04 | 8.593E-08 | -1.995E-07 |
| S11 | -1.5828 | 0 | -4.239E-04 | 2.588E-04 | -8.739E-06 | 3.325E-07 | -7.721E-09 |
| S12 | 1.06770 | 0 | 0.001083 | -1.243E-04 | 2.198E-05 | -7.683E-07 | 4.931E-09 |
as can be seen from fig. 2 to 4, the optical system in the present embodiment has good optical performance such as day-night confocal, large target surface, large aperture, large angle depth imaging, and the like.
The camera module at least comprises an optical lens, wherein the confocal large-target-surface depth imaging optical system is arranged in the optical lens.
The optical system and the camera module of the embodiment of the invention mainly comprise 6 lenses, and have simple structure; different lenses are combined with each other and optical power is reasonably distributed, so that the lens has good optical properties of day-night confocal, large target surface, large aperture, large-angle depth imaging and the like, and is suitable for industrial and 3D depth imaging cameras.
The foregoing description of one or more embodiments provided in connection with the specific disclosure is not intended to limit the practice of the invention to such description. The method, structure, etc. similar to or identical to those of the present invention, or some technical deductions or substitutions are made on the premise of the inventive concept, should be regarded as the protection scope of the present invention.
Claims (8)
1. The confocal large target surface depth imaging optical system sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from an object plane to an image plane along an optical axis; it is characterized in that the method comprises the steps of,
the object plane side of the first lens is a convex surface, the image plane side is a concave surface, and the focal power of the first lens is negative;
the object plane side of the second lens is a convex surface, the image plane side is a concave surface, and the focal power of the second lens is negative;
the object plane side of the third lens is a convex surface, the image plane 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 concave surface, the image plane side is a concave surface, and the focal power of the fourth lens is negative;
the object plane side of the fifth lens is a convex surface, the image plane side is a convex surface, and the focal power of the fifth lens is positive;
the object plane side of the sixth lens is a convex surface, the image plane side is a convex surface, and the focal power of the sixth lens is positive;
wherein the fourth lens and the fifth lens are mutually glued to form a combined lens;
the optical system satisfies the following conditions:
（1）-0.31<f/f1<-0.25；
（2）-0.40<f/f2<-0.34；
（3）0.43<f/f3<0.51；
（4）0<f/f45<0.13；
（5）0.29<f/f6<0.36；
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, f45 is the focal length of the combined lens, f6 is the focal length of the sixth lens, and f is the focal length of the whole optical system;
the diaphragm is positioned between the third lens and the fourth lens;
TTL=25.8mm。
2. the confocal large target depth imaging optical system according to claim 1, wherein a material refractive index Nd1 and a material abbe constant Vd1 of the first lens satisfy: nd1 is more than 1.80, and Vd1 is less than 50.
3. The confocal large target depth imaging optical system according to claim 1, wherein a material refractive index Nd2 and a material abbe constant Vd2 of the second lens satisfy: nd2 is less than 1.56, and Vd2 is more than 55.
4. The confocal large target depth imaging optical system according to claim 1, wherein a material refractive index Nd3 and a material abbe constant Vd3 of the third lens satisfy: nd3 is more than 1.90, and Vd3 is less than 36.
5. The confocal large target depth imaging optical system according to claim 1, wherein a material refractive index Nd4 and a material abbe constant Vd4 of the fourth lens satisfy: nd4 is more than 1.92, and Vd4 is less than 20.
6. The confocal large target depth imaging optical system according to claim 1, wherein a material refractive index Nd5 and a material abbe constant Vd5 of the fifth lens satisfy: nd5 is more than 1.80, and Vd5 is less than 50.
7. The confocal large target depth imaging optical system according to claim 1, wherein a material refractive index Nd6 and a material abbe constant Vd6 of the sixth lens satisfy: nd6 is less than 1.56, and Vd6 is more than 55.
8. An imaging module at least comprising an optical lens, wherein the confocal large-target-surface depth imaging optical system of any one of claims 1 to 7 is installed in the optical lens.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2010009028A (en) * | 2008-05-27 | 2010-01-14 | Fujinon Corp | Imaging lens and image pickup apparatus using this imaging lens |
| CN105068218A (en) * | 2015-09-15 | 2015-11-18 | 中山市弘景光电科技有限公司 | super wide angle lens |
| CN107843977A (en) * | 2017-12-14 | 2018-03-27 | 浙江舜宇光学有限公司 | Optical imaging lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2010009028A (en) * | 2008-05-27 | 2010-01-14 | Fujinon Corp | Imaging lens and image pickup apparatus using this imaging lens |
| CN105068218A (en) * | 2015-09-15 | 2015-11-18 | 中山市弘景光电科技有限公司 | super wide angle lens |
| CN107843977A (en) * | 2017-12-14 | 2018-03-27 | 浙江舜宇光学有限公司 | Optical imaging lens |
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