CN111880292B - Small-volume fisheye camera module with ultra-wide angle, ultra-high pixel and low chromatic aberration - Google Patents
Small-volume fisheye camera module with ultra-wide angle, ultra-high pixel and low chromatic aberration Download PDFInfo
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- CN111880292B CN111880292B CN202010569567.6A CN202010569567A CN111880292B CN 111880292 B CN111880292 B CN 111880292B CN 202010569567 A CN202010569567 A CN 202010569567A CN 111880292 B CN111880292 B CN 111880292B
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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
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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
- G02B13/0055—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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Abstract
The embodiment of the invention discloses a small-volume fisheye camera module with ultra-wide angle, ultra-high pixel and low chromatic aberration, which at least comprises the following components: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens; the object plane sides of the first lens, the second lens and the eighth lens are convex, the image plane side is concave, and the focal power is negative; the object plane side of the third lens is a concave surface, the image plane side is a convex surface, and the focal power is negative; the fifth lens is a biconcave lens, and the focal power of the fifth lens is negative; the fourth lens, the sixth lens and the tenth lens are biconvex lenses, and the focal power is positive; the object plane sides of the seventh lens and the ninth lens are convex, the image plane side is concave, and the focal power is positive; the embodiment of the invention mainly comprises 10 lenses, the number of the lenses is reasonable, the structure is ingenious, and the volume is small; different lenses are combined with each other and optical power is reasonably distributed, and the lens has good performances of 200-degree ultra-wide angle, 4800-ten thousand ultra-high pixels, low chromatic aberration and the like.
Description
Technical field:
the invention relates to a camera shooting module, in particular to a small-volume fisheye camera shooting module which is applicable to the fields of panoramic VR moving cameras, 360-degree dead angle-free monitoring and the like and has ultra-wide angle, ultra-high pixels and low chromatic aberration.
The background technology is as follows:
with the increasing application of high resolution technology, especially the wide application of ultra-wide angle lens, a series of high-pixel lens products appear on the market. However, the optical system has the defects of complex structure and large volume.
The invention comprises the following steps:
in order to solve the problems of complex structure and large volume of an optical system of the existing camera module, the embodiment of the invention provides a small-volume fisheye camera module with ultra-wide angle, ultra-high pixels and low chromatic aberration.
The utility model provides a little volume fisheye camera module of super wide angle super high pixel low colour difference, includes at least optical lens, installs the little volume fisheye optical system of super wide angle super high pixel low colour difference in the optical lens, and this optical system includes from object plane to image plane in proper order along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth 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 concave surface, the image plane side is a convex surface, and the focal power of the third lens is negative;
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 image plane side of the fifth lens is a concave surface, the image plane side is a concave 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;
the object plane side of the seventh lens is a convex surface, the image plane side is a concave surface, and the focal power of the seventh lens is positive;
the object plane side of the eighth lens is a convex surface, the image plane side is a concave surface, and the focal power of the eighth lens is negative;
the object plane side of the ninth lens is a convex surface, the image plane side is a concave surface, and the focal power of the ninth lens is positive;
the object plane side of the tenth lens is a convex surface, the image plane side is a convex surface, and the focal power of the tenth lens is positive.
The camera module of the embodiment of the invention mainly comprises 10 lenses, and has reasonable number of lenses, ingenious structure and small volume; different lenses are combined with each other and optical power is reasonably distributed, and the lens has good performances of 200-degree ultra-wide angle, 4800-ten thousand ultra-high pixels, low chromatic aberration and the like. The method is suitable for the fields of panoramic VR moving cameras, 360-degree dead-angle-free monitoring and the like.
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 embodiment of an image capturing module according to the present invention;
FIG. 2 is a graph of field curvature and distortion for an embodiment of an imaging module of the present invention;
FIG. 3 is a color difference chart of an embodiment of the camera module of the present invention;
FIG. 4 is a graph of the MTF transfer function of an embodiment of the camera module of the present invention;
fig. 5 is a relative illuminance diagram of an embodiment of an imaging module 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.
As shown in fig. 1, this embodiment discloses a small-volume fisheye imaging module with ultra-wide-angle ultra-high pixel and low color difference, which at least includes an optical lens, and a small-volume fisheye optical system with ultra-wide-angle ultra-high pixel and low color difference is installed in the optical lens, and the optical system sequentially includes, along an optical axis, from an object plane to an image plane: a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9, and a tenth lens 10.
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 concave surface, the image plane side is a convex surface, and the focal power of the third lens is negative;
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 image plane side of the fifth lens is a concave surface, the image plane side is a concave 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;
the object plane side of the seventh lens is a convex surface, the image plane side is a concave surface, and the focal power of the seventh lens is positive;
the object plane side of the eighth lens is a convex surface, the image plane side is a concave surface, and the focal power of the eighth lens is negative;
the object plane side of the ninth lens is a convex surface, the image plane side is a concave surface, and the focal power of the ninth lens is positive;
the object plane side of the tenth lens is a convex surface, the image plane side is a convex surface, and the focal power of the tenth lens is positive.
The camera module of the embodiment of the invention mainly comprises 10 lenses, and has reasonable number of lenses, ingenious structure and small volume; different lenses are combined with each other and optical power is reasonably distributed, and the lens has good performances of 200-degree ultra-wide angle, 4800-ten thousand ultra-high pixels, low chromatic aberration and the like. The method is suitable for the fields of panoramic VR moving cameras, 360-degree dead-angle-free monitoring and the like.
Further, as a preferred embodiment of the present invention, not limited thereto, each lens of the optical system satisfies the following condition:
(1)-0.30<f/f1<-0.08；
(2)-0.32<f/f2<-0.10；
(3)-0.39<f/f3<-0.17；
(4)0.07<f/f45<0.35；
(5)0.21<f/f6<0.46；
(6)0<f/f7<0.16；
(7)-0.19<f/f89<-0.02；
(8)0.11<f/f10<0.43；
wherein F is the focal length of the whole 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, F45 is the combined focal length after the fourth lens and the fifth lens are mutually glued, F6 is the focal length of the sixth lens, F7 is the focal length of the seventh lens, F89 is the combined focal length after the eighth lens and the ninth lens are mutually glued, and F10 is the focal length of the tenth lens. Different lenses are combined with each other and optical power is reasonably distributed, and the lens has good performances of 200-degree ultra-wide angle, 4800-ten thousand ultra-high pixels, low chromatic aberration and the like.
Still further, as a preferred embodiment of the present invention, without limitation, the fourth lens and the fifth lens are cemented with each other to form a combined lens, the optical power of the combined lens is positive, and the combined focal length f45 thereof and the focal length f of the entire optical system satisfy: 0.07< f/f45<0.35. The structure is simple and compact, the volume is small, and the good optical performance can be ensured.
Still further, as a preferred embodiment of the present invention, without limitation, the eighth lens and the ninth lens are cemented with each other to form a combined lens, the optical power of which is negative, and the combined focal length f89 thereof and the focal length f of the entire optical system satisfy: -0.19< f/f89< -0.02. The structure is simple and compact, the volume is small, and the good optical performance can be ensured.
Still further, as a preferred embodiment of the present invention, but not limited thereto, an aperture stop is located between the seventh lens and the eighth lens, near the seventh lens side. For adjusting the intensity of the light beam.
Still further, as a preferred embodiment of the present invention, without limitation, the refractive index Nd1 of the material, the abbe constant Vd1 of the material, the focal length f1, and the system focal length f of the first lens satisfy: nd1 is more than 1.70, vd1 is less than 55, -0.30< f/f1< -0.08. The structure is simple, and good optical performance can be ensured.
Further, as a preferred embodiment of the present invention, but not limited to, the refractive index Nd2 of the material, the abbe constant Vd2 of the material, the focal length f2, and the focal length f of the system of the second lens satisfy: nd2 is less than 1.6, vd2 is more than 70, vd2 is less than-0.32 f/f2 is less than-0.10. The structure is simple, and good optical performance can be ensured.
Still further, as a preferred embodiment of the present invention, without limitation, the refractive index Nd3 of the material, the abbe constant Vd3 of the material, the focal length f3, and the system focal length f of the third lens satisfy: nd3 is more than 1.7, vd3 is less than 55, -0.39< f/f3< -0.17. The structure is simple, and good optical performance can be ensured.
Still further, as a preferred embodiment of the present invention, without limitation, the material refractive index Nd4, the material abbe constant Vd4 of the fourth lens satisfy: nd4 is less than 1.85, and Vd4 is more than 23; and/or the refractive index Nd5 of the material of the fifth lens, the abbe constant Vd5 of the material satisfy: nd5 is more than 1.94, and Vd5 is less than 20. The structure is simple, and good optical performance can be ensured.
Further, as a preferred embodiment of the present invention, but not limited to, the refractive index Nd6 of the material, the abbe constant Vd6 of the material, the focal length f6, and the system focal length f of the sixth lens satisfy: nd6 is more than 1.8, vd6 is less than 44,0.21 f/f6 is less than 0.46. The structure is simple, and good optical performance can be ensured.
Still further, as a preferred embodiment of the present invention, without limitation, the material refractive index Nd7, the material abbe constant Vd7, the focal length f7, and the system focal length f of the seventh lens satisfy: nd7 is less than 1.5, vd7 is more than 80,0< f/f7 is less than 0.16. The structure is simple, and good optical performance can be ensured.
Still further, as a preferred embodiment of the present invention, without limitation, the refractive index Nd8 of the material of the eighth lens and the abbe constant Vd8 of the material satisfy: nd8 is more than 1.94, and Vd8 is less than 20. The structure is simple, and good optical performance can be ensured.
Still further, as a preferred embodiment of the present invention, without limitation, the material refractive index Nd9, the material abbe constant Vd9, the focal length f9, and the system focal length f of the ninth lens satisfy the following conditions: nd9 is less than 1.5, and Vd9 is more than 90. The structure is simple, and good optical performance can be ensured.
Still further, as a preferred embodiment of the present invention, without limitation, the tenth lens has a material refractive index Nd10, a material abbe constant Vd10, a focal length f10, and a system focal length f satisfying: nd10 < 1.56, vd10 > 70,0.11< f/f10<0.43. The structure is simple, and good optical performance can be ensured.
Still further, as a preferred embodiment of the present invention, without limitation, the second lens 2, the sixth lens 6, the seventh lens 7, and the tenth lens 10 are glass aspherical lenses. The structure is simple, and good optical performance can be ensured.
Specifically, as a preferred embodiment of the present invention, but not limited to, in this example, the focal length f=1.38 mm, the stop index F/no=1.9, the field angle fov=200°, the total optical length ttl=19 mm, and the basic parameters of the present optical system are as follows:
in the table, S1 and S2 correspond to two surfaces of the first lens 1 from the object plane to the image plane 12 along the optical axis; s3 and S4 correspond to two surfaces of the second lens 2; s5 and S6 correspond to two surfaces of the third lens 3; s7 and S8 correspond to two surfaces of the fourth lens 4; s8 and S9 correspond to two surfaces of the fifth lens 5; s10 and S11 correspond to two surfaces of the sixth lens 6; s12 and S13 correspond to two surfaces of the seventh lens 7; STO is the diaphragm 11; s15 and S16 correspond to two surfaces of the eighth lens 8; s16 and S17 correspond to two surfaces of the ninth lens 9; s18 and S19 correspond to the two surfaces of the tenth lens 10.
Still further, as a preferred embodiment of the present invention, without limitation, the surfaces of the second lens 2, the sixth lens 6, the seventh lens 7, and the tenth lens 10 are aspherical in shape, which satisfies the following equation:
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 8 The coefficients corresponding to the radial coordinates are respectively obtained. The aspherical correlation values of the second lens 2, the sixth lens 6, the seventh lens 7 and the tenth lens 10 are shown in the following table:
as can be seen from fig. 2 to 5, the optical system of the present embodiment has good performances of 200 ° ultra-wide angle, 4800 ten thousand ultra-high pixels, low chromatic aberration, and the like.
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 (10)
1. The small-volume fisheye shooting module comprises at least an optical lens, wherein an ultra-wide-angle ultra-high-pixel low-color-difference small-volume fisheye optical system is arranged in the optical lens, and the optical system is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens in sequence 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 concave surface, the image plane side is a convex surface, and the focal power of the third lens is negative;
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 image plane side of the fifth lens is a concave surface, the image plane side is a concave 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;
the object plane side of the seventh lens is a convex surface, the image plane side is a concave surface, and the focal power of the seventh lens is positive;
the object plane side of the eighth lens is a convex surface, the image plane side is a concave surface, and the focal power of the eighth lens is negative;
the object plane side of the ninth lens is a convex surface, the image plane side is a concave surface, and the focal power of the ninth lens is positive;
the object plane side of the tenth lens is a convex surface, the image plane side is a convex surface, and the focal power of the tenth lens is positive;
the fourth lens and the fifth lens are mutually glued to form a combined lens, and the focal power of the combined lens is positive;
the eighth lens and the ninth lens are mutually glued to form a combined lens, and the focal power of the combined lens is negative.
2. The ultra-wide-angle ultra-high pixel low-chromatic aberration small-volume fisheye camera module of claim 1, wherein each lens of the optical system satisfies the following conditions:
(1)-0.30＜f/f1＜-0.08；
(2)-0.32＜f/f2＜-0.10；
(3)-0.39＜f/f3＜-0.17；
(4)0.07＜f/f45＜0.35；
(5)0.21＜f/f6＜0.46；
(6)0＜f/f7＜0.16；
(7)-0.19＜f/f89＜-0.02；
(8)0.11＜f/f10＜0.43；
wherein F is the focal length of the whole 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, F45 is the combined focal length after the fourth lens and the fifth lens are mutually glued, F6 is the focal length of the sixth lens, F7 is the focal length of the seventh lens, F89 is the combined focal length after the eighth lens and the ninth lens are mutually glued, and F10 is the focal length of the tenth lens.
3. The ultra-wide-angle ultra-high pixel low-chromatic aberration small-volume fisheye camera module according to claim 1, wherein a combined focal length f45 of the fourth lens and the fifth lens glued to each other and a focal length f of the whole optical system satisfy: 0.07< f/f45<0.35.
4. The ultra-wide-angle ultra-high pixel low-chromatic aberration small-volume fisheye imaging module according to claim 1, wherein a combined focal length f89 of the eighth lens and the ninth lens glued to each other and a focal length f of the whole optical system satisfy: -0.19< f/f89< -0.02.
5. The ultra-wide-angle ultra-high pixel low-chromatic aberration small-volume fisheye imaging module of claim 1, wherein the aperture stop is located between the seventh lens and the eighth lens, near the seventh lens side.
6. The ultra-wide-angle ultra-high pixel low-chromatic aberration small-volume fisheye imaging module according to any one of claims 1-5, wherein the refractive index Nd1 of the material of the first lens, the abbe constant Vd1 of the material, the focal length f1 and the focal length f of the system satisfy: nd1 is more than 1.70, vd1 is less than 55, -0.30 is less than f/f1 is less than-0.08.
7. The ultra-wide-angle ultra-high pixel low-chromatic aberration small-volume fisheye imaging module according to any one of claims 1-5, wherein the material refractive index Nd2, the material abbe constant Vd2, the focal length f2 and the system focal length f of the second lens satisfy: nd2 is less than 1.6, vd2 is more than 70, f/f2 is less than-0.32.
8. The ultra-wide-angle ultra-high pixel low-chromatic aberration small-volume fisheye imaging module according to any one of claims 1-5, wherein the refractive index Nd3 of the material, the abbe constant Vd3 of the material, the focal length f3 and the focal length f of the system of the third lens satisfy: nd3 is more than 1.7, vd3 is less than 55, -0.39 is less than f/f3 is less than-0.17.
9. The ultra-wide-angle ultra-high pixel low-chromatic aberration small-volume fisheye imaging module according to any one of claims 1-5, wherein the material refractive index Nd4 and the material abbe constant Vd4 of the fourth lens satisfy: nd4 is less than 1.85, and Vd4 is more than 23; and/or the refractive index Nd5 of the material of the fifth lens, the abbe constant Vd5 of the material satisfy: nd5 is more than 1.94, and Vd5 is less than 20.
10. The ultra-wide-angle ultra-high pixel low-chromatic aberration small-volume fisheye imaging module according to any one of claims 1-5, wherein the refractive index Nd6 of the material of the sixth lens, the abbe constant Vd6 of the material, the focal length f6 and the focal length f of the system satisfy: nd6 is more than 1.8, vd6 is less than 44,0.21, f/f6 is less than 0.46.
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