CN108490590B - Day and night confocal fish eye monitoring optical system and camera module applying same - Google Patents
Day and night confocal fish eye monitoring optical system and camera module applying same Download PDFInfo
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- CN108490590B CN108490590B CN201810408960.XA CN201810408960A CN108490590B CN 108490590 B CN108490590 B CN 108490590B CN 201810408960 A CN201810408960 A CN 201810408960A CN 108490590 B CN108490590 B CN 108490590B
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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
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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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
- 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
- G02B13/008—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras designed for infrared light
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Abstract
The embodiment of the invention discloses a day-night confocal fish eye monitoring optical system, which sequentially comprises the following components: 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 is negative; the object plane side of the second lens is a concave surface or a convex surface, the image plane side is a concave surface, and the focal power is negative; the object plane side of the third lens is a convex surface, the image plane side is a concave surface or a plane, and the focal power is positive; the object plane side of the fourth lens is a convex surface, the image plane side is a convex surface, and the focal power is positive; the object plane side of the fifth lens is a concave surface, the image plane side is a convex surface, and the focal power is negative; the object plane side of the sixth lens is a convex surface, the image plane side is a convex surface, and the focal power 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 the advantages of simple structure, small volume and light weight.
Description
Technical field:
the invention relates to an optical system and a camera module applied to the optical system, in particular to a fish-eye monitoring optical system and a camera module applied to the optical system.
The background technology is as follows:
the high-resolution high-definition fish-eye lens is widely applied to security monitoring, vehicle-mounted looking around and other devices. The traditional high-definition fisheye lens has the problems of complex structure, large volume, heavy weight, high price, poor temperature characteristic and the like.
The invention comprises the following steps:
in order to solve the problems of complex structure and large volume of the traditional fish-eye lens, the embodiment of the invention provides a day-night confocal fish-eye monitoring optical system.
A day and night confocal fish eye monitoring 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, 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 concave surface or 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 concave surface or a plane, and the focal power of the third lens is positive;
the object plane side of the fourth lens is a convex surface, the image plane side is a convex surface, and the focal power of the fourth lens is positive;
the object plane side of the fifth lens is a concave surface, the image plane side is a convex surface, and the focal power of the fifth lens is negative;
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 day-night confocal fish eye monitoring 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 the advantages of simple structure, small volume, light weight and low cost; the optical power is reasonably distributed by mutually combining different lenses, and the lens has the advantages of high resolving power, good relative illumination, excellent temperature characteristic, complete day and night confocal and other good optical performances.
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 the MTF of an optical system or lens of the present invention;
fig. 3 is a graph of relative illuminance of 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 day-night confocal fish-eye monitoring optical system, which sequentially includes, from an object plane to an image plane 8 along an optical axis: 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 concave surface or a convex surface, the image plane side is a concave surface, and the focal power is negative;
the object plane side of the third lens 3 is a convex surface, the image plane side is a concave surface or a plane, and the focal power of the third lens is positive;
the object plane side of the fourth lens 4 is a convex surface, the image plane side is a convex surface, and the focal power is positive;
the object plane side of the fifth lens 5 is a concave surface, the image plane side is a convex surface, and the focal power thereof is negative;
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 the advantages of simple structure, small volume, light weight and low cost; the optical power is reasonably distributed by mutually combining different lenses, and the lens has the advantages of high resolving power, good relative illuminance, excellent temperature characteristic (-40 ℃ to +85 ℃, BFL: shift + -0.005 mm), complete day and night confocal and other good optical performances.
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: 2.12 < |f45/f| < 5.12. The structure is simple, the optical power is reasonably distributed by mutually combining different lenses, and the lens has the good optical performance of high resolving power, good relative illumination, excellent temperature characteristic, complete day and night confocal and the like.
Still further, as a specific embodiment of the present embodiment, not limiting, the focal length f1 of the first lens 1 and the focal length f of the entire optical system satisfy: 5.5 < |f1/f| < 8.5; the refractive index Nd1 and Abbe constant Vd1 of the material satisfy the following conditions: 1.75< Nd1,20< Vd1<50. The structure is simple, and good optical performance can be ensured.
Further, as a specific embodiment of the present embodiment, but not limited to, the focal length f2 of the second lens 2 and the focal length f3 of the third lens 3 satisfy: 1.2 < |f3/f2| < 2.4. The structure is simple, and good optical performance can be ensured.
Still further, as a specific embodiment of the present embodiment, but not limited to, the focal length f3 of the third lens 3 and the focal length f45 of the combined lens satisfy: 0.8 < |f3/f45| < 1.4; the Abbe constant Vd3 of the material meets the following conditions: vd3<40. The structure is simple, and good optical performance can be ensured.
Still further, as a specific embodiment of the present embodiment, but not limited to, the focal length f6 of the sixth lens 6 and the focal length f2 of the second lens 2 satisfy: 0.01 < |f2/f6| < 0.25. The structure is simple, and good optical performance can be ensured.
Further, as a specific embodiment of the present embodiment, not limited thereto, the optical total length TTL of the optical system satisfies: 15mm < TTL <20mm. The structure is simple, and good optical performance can be ensured.
Still further, as a specific embodiment of the present invention, not limited thereto, the diaphragm 7 of the optical system is located between the third lens 3 and the fourth lens 4, near the object plane side of the fourth lens 4. The structure is simple, and the device is used for adjusting the intensity of the light beam.
Still further, as a specific embodiment of the present invention, but not limited to, the first lens 1 and the third lens 3 are glass lenses, and the second lens 2, the fourth lens 4, the fifth lens 5 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 the present embodiment, the focal length f of the present optical system is 1.08mm, f/no=2.0, hfov=192°, ttl=17.0 mm. The basic parameters of the optical system are shown in the following table:
| surface of the body | Radius of curvature R (mm) | Interval D (mm) | Refractive index Nd | Dispersion value Vd |
| S1 | 12.91 | 0.98 | 1.83 | 42.74 |
| S2 | 4.29 | 3.77 | ||
| S3 | -10.28 | 1.20 | 1.54 | 55.78 |
| S4 | 1.22 | 1.44 | ||
| S5 | 3.2 | 3.29 | 1.92 | 18.90 |
| S6 | 38.65 | 0.35 | ||
| STO | INFINITY | 0.05 | ||
| S8 | 3.38 | 1.28 | 1.54 | 55.78 |
| S9 | -0.94 | 1.15 | 1.64 | 23.26 |
| S10 | -2.80 | 0.44 | ||
| S11 | 7.52 | 0.45 | 1.54 | 55.78 |
| S12 | -12.57 | 0.20 | ||
| S13 | INFINITY | 0.70 | 1.52 | 64.21 |
| S14 | INFINITY | 1.70 | ||
| IMA | INFINITY | 0.00 |
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 and S14 correspond to two surfaces of the bandpass filter between the sixth lens 6 and the image plane 8; IMA is the image plane 8.
More specifically, the surfaces of the second lens 2, the fourth lens 4, the fifth lens 5, and the sixth lens 6 are aspherical shapes, which satisfy the following equations:wherein, the parameter c=1/R is the curvature corresponding to the radius, y is the radial coordinate, the unit is the same as the lens length unit, k is the conic coefficient, a 1 To a 5 The coefficients corresponding to the radial coordinates are respectively obtained. The aspherical correlation values of the S3 and S4 surfaces of the second lens 2, the S8 and S9 surfaces of the fourth lens 4, the S9 and S10 surfaces of the fifth lens 5, and the S11 and S12 surfaces of the sixth lens 6 are shown in the following table:
as can be seen from fig. 2 to 3, the optical system in this embodiment has good optical properties such as high resolution, good relative illuminance, excellent temperature characteristics (-40 ℃ -85 ℃, BFL: shift±0.005 mm), and complete confocal day and night.
The camera module at least comprises an optical lens, wherein the day-night confocal fish eye monitoring 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 the advantages of simple structure, small volume, light weight and low cost; the optical power is reasonably distributed by mutually combining different lenses, and the lens has the advantages of high resolving power, good relative illuminance, excellent temperature characteristic (-40 ℃ to +85 ℃, BFL: shift + -0.005 mm), complete day and night confocal and other good optical performances.
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 (3)
1. The day-night confocal fish eye monitoring optical system 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 concave surface or 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 concave surface or a plane, and the focal power of the third lens is positive;
the object plane side of the fourth lens is a convex surface, the image plane side is a convex surface, and the focal power of the fourth lens is positive;
the object plane side of the fifth lens is a concave surface, the image plane side is a convex surface, and the focal power of the fifth lens is negative;
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 number of lenses of the optical system having optical power is 6, and basic parameters of each lens are shown in the following table:
in the table, S1 and S2 are two surfaces of the first lens correspondingly from the object plane to the image plane along the optical axis; s3 and S4 are correspondingly two surfaces of the second lens; s5 and S6 are correspondingly two surfaces of the third lens; STO is the diaphragm; s8 and S9 correspond to two surfaces of the fourth lens; s9 and S10 are correspondingly two surfaces of the fifth lens; s11 and S12 correspond to two surfaces of the sixth lens; s13 and S14 are respectively arranged on two surfaces of the band-pass filter between the sixth lens and the image plane; IMA is the image plane.
2. The day-night confocal fisheye-monitoring optical system of claim 1, wherein the first lens and the third lens are glass lenses and the second lens, the fourth lens, the fifth lens and the sixth lens are plastic aspheric lenses.
3. An imaging module at least comprising an optical lens, wherein the optical lens is internally provided with the day-night confocal fish-eye monitoring optical system as claimed in any one of claims 1-2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810408960.XA CN108490590B (en) | 2018-05-02 | 2018-05-02 | Day and night confocal fish eye monitoring optical system and camera module applying same |
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| CN201810408960.XA CN108490590B (en) | 2018-05-02 | 2018-05-02 | Day and night confocal fish eye monitoring optical system and camera module applying same |
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| CN108490590B true CN108490590B (en) | 2023-07-28 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104849839A (en) * | 2015-06-06 | 2015-08-19 | 中山市弘景光电科技有限公司 | Pin hole monitoring optical system and lens applying same |
| CN206258618U (en) * | 2016-12-14 | 2017-06-16 | 江西联益光学有限公司 | Micro pick-up lens |
| CN107621689A (en) * | 2017-11-08 | 2018-01-23 | 广东弘景光电科技股份有限公司 | Minimize fish eye optical systems |
| CN107765405A (en) * | 2017-11-08 | 2018-03-06 | 广东弘景光电科技股份有限公司 | Minimize flake camera module |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104849839A (en) * | 2015-06-06 | 2015-08-19 | 中山市弘景光电科技有限公司 | Pin hole monitoring optical system and lens applying same |
| CN206258618U (en) * | 2016-12-14 | 2017-06-16 | 江西联益光学有限公司 | Micro pick-up lens |
| CN107621689A (en) * | 2017-11-08 | 2018-01-23 | 广东弘景光电科技股份有限公司 | Minimize fish eye optical systems |
| CN107765405A (en) * | 2017-11-08 | 2018-03-06 | 广东弘景光电科技股份有限公司 | Minimize flake camera module |
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