CN117369097A - Large-aperture large-target-surface miniature fish-eye lens - Google Patents
Large-aperture large-target-surface miniature fish-eye lens Download PDFInfo
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- CN117369097A CN117369097A CN202311677326.3A CN202311677326A CN117369097A CN 117369097 A CN117369097 A CN 117369097A CN 202311677326 A CN202311677326 A CN 202311677326A CN 117369097 A CN117369097 A CN 117369097A
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- 230000003287 optical effect Effects 0.000 claims abstract description 42
- 239000011521 glass Substances 0.000 claims abstract description 18
- 230000001681 protective effect Effects 0.000 claims abstract description 15
- 229920003023 plastic Polymers 0.000 claims abstract description 11
- 239000004033 plastic Substances 0.000 claims abstract description 11
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- 239000006059 cover glass Substances 0.000 description 2
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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
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical 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
- G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
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Abstract
The invention relates to a large aperture large target surface miniature fisheye lens, which comprises eight lenses with refractive power and a piece of protective glass in sequence from an object side to an image side along an optical axis, wherein the lens comprises the following components: a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with negative focal power, a seventh lens with positive focal power, an eighth lens with positive focal power and a protective glass; the third lens is an aspherical lens made of plastic, and the eighth lens is an aspherical lens made of plastic, so that the problem that the height of a target surface and the size of an aperture are difficult to improve simultaneously on the premise of ensuring miniaturization and imaging quality of the existing miniature fisheye lens is solved.
Description
Technical Field
The invention relates to the field of fisheye lenses, in particular to a large-aperture large-target-surface miniature fisheye lens.
Background
The miniature fish-eye lens is also called panoramic lens, and is an ultra-wide angle lens applied to the bionic technology, and the design inspiration of the miniature fish-eye lens is derived from the bionic principle, in particular to the visual system of underwater fish. The miniature fish-eye lens is used for artificially introducing a large amount of barrel-shaped distortion to obtain a large visual angle, so that image information with a large visual field can be obtained, and the image has certain distortion except for the shape of an object in the center of a picture. The exaggerated angle of view and distortion effect of the miniature fish-eye lens are very useful for photographing a wide range of scenes at a short distance, and a picture with strong visual impact can be easily obtained.
With the development of fields such as monitoring and vehicle-mounted fields, the requirements of the miniature fish-eye lens are higher and higher, and the structure of the lens is more and more various. In order to receive more light, the micro fisheye lens is gradually developed to a large aperture and a large target surface. However, the existing miniature fisheye lens has the disadvantages of low target surface size, small aperture or difficulty in both the target surface and the aperture on the premise of ensuring imaging quality. And the prior fish-eye lens has large aperture of the first lens due to large angle of view, which is not beneficial to subsequent assembly.
Therefore, developing a micro fisheye lens with high imaging quality and large aperture and large target surface becomes an urgent problem for optical designers.
Disclosure of Invention
In order to overcome the technical problems, the invention discloses a large-aperture large-target-surface miniature fisheye lens. The aperture of the miniature fisheye lens on the market is usually about 2.4, the half image height is less than 4.5mm or the aperture of the miniature fisheye lens is difficult to improve simultaneously. The invention has the advantages that the maximum aperture is 1.83, the focal length is 4.22-5.01 mm, the field angle is 190 degrees and the half image height is 7mm through the opposite structure of the third aspheric lens and the eighth aspheric lens and the fourth plano-convex lens and the fifth plano-convex lens, the size of the target surface is adapted to 1/1.8, and the invention is suitable for vehicle-mounted radar probes and places needing to be monitored in a concealed mode.
In order to achieve the above object, the present application provides a large aperture large target surface micro fisheye lens, comprising:
the focal length of the large-aperture large-target-surface miniature fish-eye lens is 4.2mm-5.1mm, the full-field angle is 190 degrees, the F-number of the aperture is 1.8-2.1, the total length is less than 30mm, and the half-image height is 7mm;
the large aperture large target surface micro fisheye lens has eight lenses with refractive power and one piece of protective glass, and sequentially comprises from an object side to an image side along an optical axis: a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with negative focal power, a seventh lens with positive focal power, an eighth lens with positive focal power and a protective glass;
a diaphragm is arranged between the fifth lens and the sixth lens;
the sixth lens is glued with the seventh lens;
the third lens and the eighth lens are aspheric lenses made of plastics;
the large aperture large target surface miniature fish-eye lens meets the following relational expression, and the F/y is more than or equal to 0.25 and less than or equal to 0.3; wherein F is the aperture of the lens, and y is the half-image height of the lens;
the large aperture large target surface miniature fish-eye lens meets the following relational expression, and D is more than or equal to 0.88 percent 1 Tan omega is less than or equal to 1.48; wherein D is 1 And tan omega is the tangent value of the half field angle of the lens, which is the caliber of the first lens of the lens.
Further, the sixth lens is glued to the seventh lens;
，
wherein v is 6 、f 6 Abbe number and effective focal length of optical material used for the sixth lens, v 7 、f 7 The abbe number and the effective focal length of the optical material used for the seventh lens.
Further, the third lens is an aspherical lens made of plastic, and the eighth lens is an aspherical lens made of plastic;
let the Z axis be the optical axis, the origin of the rectangular coordinate system (x, y, Z) coincides with the origin of the aspheric surface, and the axis of rotation coincides with the optical axis of the system, the surface shape of the aspheric surface can be expressed as:
，
wherein,the incidence height of light on the aspheric surface is represented by a cone coefficient, A 2 ,A 4 ,A 6 ,. it is a higher order aspheric coefficient, c is the curvature at the apex of the aspheric surface; z is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the direction of the optical axis O; k is a conical surface coefficient; a is that i Is the correction coefficient of the i-th order of the aspherical surface.
Further, the first lens, the second lens, the fourth lens and the seventh lens are all spherical lenses made of glass.
Further, the first lens is a convex-concave lens with the convex surface facing the object space, the second lens is a biconcave lens, the third lens is a convex-concave lens with the convex surface facing the image space, the fourth lens is a plano-convex lens with the convex surface facing the image space, the fifth lens is a convex-plano lens with the convex surface facing the object space, the sixth lens is a convex-concave lens with the convex surface facing the object space, the seventh lens is a biconvex lens, and the eighth lens is a biconvex lens.
Further, the large aperture large target surface miniature fisheye lens meets the following conditions:
46.74≤|f 1 /f|≤202.98；
2.16≤|f 2 /f|≤2.71；
3.87≤|f 3 /f|≤5.05；
2.88≤|f 4 /f|≤3.05；
2.19≤|f 5 /f|≤2.92；
1.22≤|f 6 /f|≤1.72；
1.23≤|f 7 /f|≤1.31；
5.62≤|f 8 /f|≤1644，
wherein f is the effective focal length of the large aperture large target surface miniature fisheye lens, f 1 F is the effective focal length of the first lens 2 F is the effective focal length of the second lens 3 F is the effective focal length of the third lens 4 F is the effective focal length of the fourth lens 5 Is the effective focus of the fifth lensDistance f 6 F is the effective focal length of the sixth lens 7 F is the effective focal length of the seventh lens 8 Is the effective focal length of the eighth lens.
Further, the optical constants of the materials used for the third lens and the eighth lens are satisfied with the following conditional expression:
1.50＜nd 3 ＜1.60，30＜vd 3 ＜40；
1.50＜nd 8 ＜1.60，60＜vd 8 ＜70；
where nd 3 、vd 3 Refractive index and Abbe number, nd, of the material used for the third lens 8 、vd 8 Refractive index and abbe number of the material used for the eighth lens.
Compared with the prior art, the invention has the beneficial effects that:
the invention relates to a large aperture large target surface miniature fisheye lens, which can improve the height of the target surface and the aperture size on the premise of ensuring miniaturization and imaging quality. The focal length of the lens is 4.2mm, the full field angle is 190 degrees, the F-number of the aperture is 1.83-2.17, the total length is less than 30mm, and the half image height is 7mm.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an embodiment 1 of a large aperture large target surface micro fisheye lens according to the invention.
Fig. 2 is a longitudinal spherical aberration diagram of example 1 of a large aperture large target miniature fisheye lens of the invention.
FIG. 3 is a graph of lateral chromatic aberration for example 1 of a large aperture large target miniature fisheye lens of the invention.
Fig. 4 is a graph showing the analysis of the modulation transfer function of example 1 of the large aperture large target surface micro fisheye lens of the present invention.
Fig. 5 is a schematic structural diagram of an embodiment 2 of a large aperture large target surface micro fisheye lens according to the invention.
Fig. 6 is a longitudinal spherical aberration diagram of example 2 of a large aperture large target miniature fisheye lens of the invention.
FIG. 7 is a graph of lateral chromatic aberration for example 2 of a large aperture large target miniature fisheye lens of the invention.
FIG. 8 is a graph showing the modulation transfer function of example 2 of a large aperture large target miniature fisheye lens according to the invention.
Fig. 9 is a schematic structural diagram of an embodiment 3 of a large aperture large target surface micro fisheye lens according to the invention.
FIG. 10 is a longitudinal spherical aberration diagram of example 3 of a large aperture large target miniature fisheye lens of the invention.
FIG. 11 is a graph of lateral chromatic aberration for example 3 of a large aperture large target miniature fisheye lens of the invention.
FIG. 12 is a graph showing the modulation transfer function of example 3 of a large aperture large target miniature fisheye lens according to the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are only used to better describe the present invention and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations.
Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the present invention will be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, the terms "first," "second," and the like, are used primarily to distinguish between different devices, elements, or components (the particular species and configurations may be the same or different), and are not used to indicate or imply the relative importance and number of devices, elements, or components indicated. Unless otherwise indicated, the meaning of "a plurality" is two or more.
The invention discloses an optical lens, which comprises eight lenses with refractive power and a piece of protective glass in sequence from an object side to an image side along an optical axis, wherein the eight lenses with refractive power comprise: a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with negative focal power, a seventh lens with positive focal power, an eighth lens with positive focal power and protective glass.
The third lens is an aspherical lens made of plastic, and the eighth lens is an aspherical lens made of plastic. By making the third lens be an aspherical lens made of plastic, the third lens is beneficial to correcting third order meridian spherical aberration, third order sagittal spherical aberration, third order meridian coma, third order sagittal coma, third order astigmatism, field curvature and the like, and is also beneficial to shortening the diameter of the first lens, so that the total length of the large-aperture large-target-surface miniature fisheye lens is shortened.
The large aperture large target surface miniature fisheye lens satisfies the following relation,
0.25≤|F/y|≤0.3；
wherein F is the aperture of the lens, and y is the half-image height of the lens; the above relation enables the ratio of the aperture to the half image height to be controlled, and the aperture and the half image height become larger together, so that the purpose of large aperture and large target surface is achieved.
The large aperture large target surface miniature fisheye lens satisfies the following relation,
0.88≤|D 1 /tanω|≤1.48；
wherein D is 1 The tan omega is the tan value of the half field angle of the lens; the above relation can control the ratio of the aperture of the first sheet to the half field of view, and when the field of view becomes large, the aperture is not large, or the aperture is restrained from becoming large.
The large aperture large target surface miniature fisheye lens, the sixth lens and the seventh lens are glued, and the following relation is satisfied:
，
wherein v is 6 、f 6 Abbe number and effective focal length of optical material used for the sixth lens, v 7 、f 7 The abbe number and the effective focal length of the optical material used for the seventh lens. The formula value is close to 0, which is favorable for correcting the axial chromatic aberration and the vertical chromatic aberration.
The large aperture large target surface miniature fisheye lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens, wherein the first lens is a convex-concave lens, the convex surface faces towards the object space, the second lens is a biconcave lens, the third lens is a convex-concave lens, the convex surface faces towards the image space, the fourth lens is a planoconvex lens, the convex surface faces towards the image space, the fifth lens is a convex-plano lens, the convex surface faces towards the object space, the sixth lens is a convex-concave lens, the convex surface faces towards the object space, the seventh lens is a biconvex lens, and the eighth lens is a biconvex lens. And a diaphragm is arranged between the fifth lens and the sixth lens.
The large aperture large target surface miniature fisheye lens meets the following relation:
46.74≤|f 1 /f|≤202.98；
2.16≤|f 2 /f|≤2.71；
3.87≤|f 3 /f|≤5.05；
2.88≤|f 4 /f|≤3.05；
2.19≤|f 5 /f|≤2.92；
1.22≤|f 6 /f|≤1.72；
1.23≤|f 7 /f|≤1.31；
5.62≤|f 8 /f|≤1644，
wherein f is the effective focal length of the large aperture large target surface miniature fisheye lens, f 1 F is the effective focal length of the first lens 2 F is the effective focal length of the second lens 3 F is the effective focal length of the third lens 4 F is the effective focal length of the fourth lens 5 F is the effective focal length of the fifth lens 6 F is the effective focal length of the sixth lens 7 F is the effective focal length of the seventh lens 8 Is the effective focal length of the eighth lens. By the design, the large aperture, the large target surface and the miniaturization can be considered, and the optical imaging quality can be realized.
The F number of the large-aperture large-target-surface miniature fisheye lens is 1.8-2.1, and the minimum F number is 1.83. The full-field angle of the large-aperture large-target-surface miniature fisheye lens is equal to 190 degrees.
The refractive index and Abbe number of materials used for the lenses of the first lens to the eighth lens meet the following conditional expression:
1.40＜nd l ＜1.50，75＜vd l ＜85；
1.45＜nd 2 ＜1.55，70＜vd 2 ＜85；
1.50＜nd 3 ＜1.60，30＜vd 3 ＜40；
1.50＜nd 4 ＜1.65，50＜vd 4 ＜65；
1.60＜nd 5 ＜1.90，40＜vd 5 ＜65；
1.90＜nd 6 ＜1.95，20＜vd 6 ＜25；
1.45＜nd 7 ＜1.50，80＜vd 7 ＜85；
1.50＜nd 8 ＜1.60，60＜vd 8 ＜70；
where nd 1 、vd 1 Refractive index and Abbe number, nd, of the material used for the first lens sheet 2 、vd 2 Refractive index and Abbe number, nd, of the material used for the second lens 3 、vd 3 Refractive index and Abbe number, nd, of the material used for the third lens 4 、vd 4 Refractive index and Abbe number, nd, of the material used for the fourth lens 5 、vd 5 Refractive index and Abbe number, nd, of the material used for the fifth lens 6 、vd 6 Refractive index and Abbe number, nd, of the material used for the sixth lens 7 、vd 7 Refractive index and Abbe number, nd of the material used for the seventh lens 8 、vd 8 Refractive index and abbe number of the material used for the eighth lens.
The first lens, the second lens, the fourth lens and the seventh lens are all spherical lenses made of glass.
The expression of the aspheric surface type of the surfaces of the third lens and the eighth lens is as follows:
let the Z axis be the optical axis, the origin of the rectangular coordinate system (x, y, Z) coincides with the origin of the aspheric surface, and the axis of rotation coincides with the optical axis of the system, the surface shape of the aspheric surface can be expressed as:
，
wherein,the height of incidence of a ray on an aspherical surface, k is the conic coefficient, A2, A4, A6. Z is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the direction of the optical axis O; c is the curvature at the optical axis O, c=1/R (i.e., paraxial curvature c is the inverse of the radius of curvature R); k is a conical surface coefficient; ai is the correction coefficient of the i-th order of the aspherical surface.
Example 1
As shown in fig. 1, the large aperture large target surface micro fisheye lens system of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens L1 with negative focal power, a second lens L2 with negative focal power, a third lens L3 with negative focal power, a fourth lens L4 with positive focal power, a fifth lens L5 with positive focal power, a sixth lens L6 with negative focal power, a seventh lens L7 with positive focal power, an eighth lens L8 with positive focal power and a protective glass L9. Wherein S1 is the object side of the first lens, S2 is the image side of the first lens, S3 is the object side of the second lens, S4 is the image side of the second lens, S5 is the object side of the third lens, S6 is the image side of the third lens, S7 is the object side of the fourth lens, S8 is the image side of the fourth lens, S9 is the object side of the fifth lens, S10 is the image side of the fifth lens, S11 is the object side of the sixth lens, S12 is the image side of the sixth lens, S12 is the object side of the seventh lens, S13 is the image side of the seventh lens, S14 is the object side of the eighth lens, S15 is the image side of the ninth lens (protective glass), S17 is the image side of the ninth lens (protective glass), the dotted line between S10 and S11 is a diaphragm, and the dotted line on the right side of S17 is the image plane.
In this example 1, the F-number of the large aperture large target surface micro fisheye lens is 2.17, the focal length is 5.01mm, the angle of view is 190 °, and the total length is 30mm. The detailed optical data of the large aperture large target surface micro fisheye lens in this example 1 are shown in tables 1-1 and 1-2 below:
TABLE 1-1
TABLE 1-2
Wherein, let the Z axis be the optical axis, the origin (x, y, Z) of rectangular coordinate system coincides with the origin of the aspheric surface, and the rotation axis coincides with the optical axis of the system, the surface shape of the aspheric surface can be expressed as:
,
wherein,the height of incidence of a ray on an aspherical surface, k is the conic coefficient, A2, A4, A6. Z is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the direction of the optical axis O; c is the curvature at the optical axis O, c=1/R (i.e., paraxial curvature c is the inverse of the radius of curvature R in table 1-1); k is a conical surface coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. The higher order coefficients A4, A6, A8, A10, A12, A14 that can be used for each of the aspherical mirror surfaces in the examples are given in tables 1-2.
Fig. 1 to 4 are a schematic structural diagram, a longitudinal spherical aberration diagram, a lateral chromatic aberration diagram, and a modulation transfer function analysis diagram in this embodiment 1 in order; wherein the 0.00 meridian MTF line in fig. 4 coincides with the 0.00 sagittal MTF line. It can be seen from the graph that the longitudinal spherical aberration is within 0.01mm, the transverse chromatic aberration is within 0.0011mm, and the full field modulation transfer function is >0.42 when the modulation transfer function is 240 lp/mm.
Example 2
As shown in fig. 5, the large aperture large target surface micro fisheye lens system of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens L10 with negative focal power, a second lens L11 with negative focal power, a third lens L12 with negative focal power, a fourth lens L13 with positive focal power, a fifth lens L14 with positive focal power, a sixth lens L15 with negative focal power, a seventh lens L16 with positive focal power, an eighth lens L17 with positive focal power and a protective glass L18. Wherein S18 is the object side of the first lens, S19 is the image side of the first lens, S20 is the object side of the second lens, S21 is the image side of the second lens, S22 is the object side of the third lens, S23 is the image side of the third lens, S24 is the object side of the fourth lens, S25 is the image side of the fourth lens, S26 is the object side of the fifth lens, S27 is the image side of the fifth lens, S28 is the object side of the sixth lens, S29 is the image side of the sixth lens, S29 is the object side of the seventh lens, S30 is the image side of the seventh lens, S31 is the object side of the eighth lens, S32 is the image side of the eighth lens, S33 is the object side of the ninth lens (cover glass), S34 is the image side of the ninth lens (cover glass), the dotted line between S27 and S28 is a diaphragm, and the dotted line on the right of S34 is the image side.
In this example 2, the F-number of the large aperture large target surface micro fisheye lens is 2.0, the focal length is 4.69mm, the angle of view is 190 °, and the total length is 27mm. The detailed optical data of the large aperture large target surface micro fisheye lens in this example 1 are shown in tables 2-1 and 2-2 below:
TABLE 2-1
TABLE 2-2
Wherein, let the Z axis be the optical axis, the origin (x, y, Z) of rectangular coordinate system coincides with the origin of the aspheric surface, and the rotation axis coincides with the optical axis of the system, the surface shape of the aspheric surface can be expressed as:
,
wherein,the height of incidence of a ray on an aspherical surface, k is the conic coefficient, A2, A4, A6. Z is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the direction of the optical axis O; c is the curvature at the optical axis O, c=1/R (i.e., paraxial curvature c is the inverse of the radius of curvature R in table 2-1); k is a conical surface coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. The higher order coefficients A4, A6, A8, A10, A12, A14 that can be used for each of the aspherical mirror surfaces in the examples are given in Table 2-2.
Fig. 5 to 8 are a schematic structural diagram, a longitudinal spherical aberration diagram, a lateral chromatic aberration diagram, and a modulation transfer function analysis diagram in this embodiment 2 in order; wherein the 0.00 meridian MTF line in fig. 8 coincides with the 0.00 sagittal MTF line. It can be seen from the graph that the longitudinal spherical aberration is within 0.01mm, the transverse chromatic aberration is within 0.0011mm, and the full field modulation transfer function is >0.42 when the modulation transfer function is 240 lp/mm.
Example 3
As shown in fig. 9, the large aperture large target surface micro fisheye lens system of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens L19 with negative focal power, a second lens L20 with negative focal power, a third lens L21 with negative focal power, a fourth lens L22 with positive focal power, a fifth lens L23 with positive focal power, a sixth lens L24 with negative focal power, a seventh lens L25 with positive focal power, an eighth lens L26 with positive focal power and a protective glass L27. Wherein S35 is the object side of the first lens, S36 is the image side of the first lens, S37 is the object side of the second lens, S38 is the image side of the second lens, S39 is the object side of the third lens, S40 is the image side of the third lens, S41 is the object side of the fourth lens, S42 is the image side of the fourth lens, S43 is the object side of the fifth lens, S44 is the image side of the fifth lens, S45 is the object side of the sixth lens, S46 is the image side of the sixth lens, S46 is the object side of the seventh lens, S47 is the image side of the seventh lens, S48 is the object side of the eighth lens, S49 is the image side of the ninth lens (protective glass), S51 is the image side of the ninth lens (protective glass), the dotted line between S44 and S45 is a diaphragm, and the dotted line on the right of S51 is the image plane. In this example 3, the F-number of the large aperture large target surface micro fisheye lens is 1.83, the focal length is 4.22mm, the angle of view is 190 °, and the total length is 25mm. Detailed optical data of the large aperture large target surface micro fisheye lens in this example 1 are shown in tables 3-1 and 3-2 below;
TABLE 3-1
TABLE 3-2
Wherein, let the Z axis be the optical axis, the origin (x, y, Z) of rectangular coordinate system coincides with the origin of the aspheric surface, and the rotation axis coincides with the optical axis of the system, the surface shape of the aspheric surface can be expressed as:
,
wherein,the height of incidence of a ray on an aspherical surface, k is the conic coefficient, A2, A4, A6. Z is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the direction of the optical axis O; c is the curvature at the optical axis O, c=1/R (i.e., paraxial curvature c is the inverse of the radius of curvature R in table 3-1); k is a conical surface coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. The higher order coefficients A4, A6, A8, A10, A12, A14 that can be used for each of the aspherical mirror surfaces in the examples are given in Table 3-2.
Fig. 9 to 12 are a schematic structural diagram, a longitudinal spherical aberration diagram, a lateral chromatic aberration diagram, and a modulation transfer function analysis diagram in this embodiment 3 in order, wherein the 0.00 meridian MTF line in fig. 12 coincides with the 0.00 sagittal MTF line. It can be seen from the graph that the longitudinal spherical aberration is within 0.008mm, the lateral color difference graph is within 0.0012mm, and the full field modulation transfer function is >0.46 at 240 lp/mm.
The invention solves the problem that the height of the target surface and the size of the aperture are difficult to improve simultaneously on the premise of ensuring miniaturization and imaging quality of the traditional miniature fisheye lens, and the invention provides a large aperture large target surface miniature fisheye with the maximum aperture of 1.83, the focal length of 4.22mm-5.01mm, the angle of view of 190 ℃ and the half image height of 7mm and the adaptation of 1/1.8 target surface size.
Claims (7)
1. The large aperture large target surface miniature fish-eye lens is characterized in that the focal length of the lens is 4.2mm-5.1mm, the full view angle is 190 degrees, the F-number of the aperture is 1.8-2.1, the total length is less than 30mm, and the half image height is 7mm;
the large aperture large target surface micro fisheye lens has eight lenses with refractive power and one piece of protective glass, and sequentially comprises from an object side to an image side along an optical axis: a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with negative focal power, a seventh lens with positive focal power, an eighth lens with positive focal power and a protective glass;
a diaphragm is arranged between the fifth lens and the sixth lens;
the third lens and the eighth lens are aspheric lenses made of plastics;
the large aperture large target surface miniature fish-eye lens meets the following relational expression, and the F/y is more than or equal to 0.25 and less than or equal to 0.3; wherein F is the aperture of the lens, and y is the half-image height of the lens;
the large aperture large target surface miniature fish-eye lens meets the following relational expression, and D is more than or equal to 0.88 percent 1 Tan omega is less than or equal to 1.48; wherein D is 1 And tan omega is the tangent value of the half field angle of the lens, which is the caliber of the first lens of the lens.
2. The large aperture large target surface micro fisheye lens of claim 1 wherein the sixth lens is cemented with the seventh lens and satisfies the following relationship:
，
wherein v is 6 、f 6 Abbe number and effective focal length of optical material used for the sixth lens, v 7 、f 7 The abbe number and the effective focal length of the optical material used for the seventh lens.
3. The large aperture large target surface micro fisheye lens according to claim 1, wherein the third lens is an aspherical lens made of plastic, and the eighth lens is an aspherical lens made of plastic;
let the Z axis be the optical axis, the origin of the rectangular coordinate system (x, y, Z) coincides with the origin of the aspheric surface, and the axis of rotation coincides with the optical axis of the system, the surface shape of the aspheric surface can be expressed as:
，
wherein,the incidence height of light on the aspheric surface is represented by a cone coefficient, A 2 ,A 4 ,A 6 ,. it is a higher order aspheric coefficient, c is the curvature at the apex of the aspheric surface; z is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the direction of the optical axis O; k is a conical surface coefficient; a is that i Is the correction coefficient of the i-th order of the aspherical surface.
4. The large aperture large target surface micro fisheye lens of claim 1 wherein the first lens, the second lens, the fourth lens and the seventh lens are all spherical lenses made of glass.
5. The large aperture large target surface micro fisheye lens according to claim 1, wherein the first lens is a convex-concave lens with its convex surface facing the object side, the second lens is a biconcave lens, the third lens is a concave-convex lens with its convex surface facing the image side, the fourth lens is a plano-convex lens with its convex surface facing the image side, the fifth lens is a convex-plano lens with its convex surface facing the object side, the sixth lens is a convex-concave lens with its convex surface facing the object side, the seventh lens is a biconvex lens, and the eighth lens is a biconvex lens.
6. The large aperture large target surface miniature fisheye lens of claim 1, wherein the large aperture large target surface miniature fisheye lens satisfies:
46.74≤|f 1 /f|≤202.98；
2.16≤|f 2 /f|≤2.71；
3.87≤|f 3 /f|≤5.05；
2.88≤|f 4 /f|≤3.05；
2.19≤|f 5 /f|≤2.92；
1.22≤|f 6 /f|≤1.72；
1.23≤|f 7 /f|≤1.31；
5.62≤|f 8 /f|≤1644，
wherein f is the effective focal length of the large aperture large target surface miniature fisheye lens, f 1 F is the effective focal length of the first lens 2 F is the effective focal length of the second lens 3 F is the effective focal length of the third lens 4 F is the effective focal length of the fourth lens 5 F is the effective focal length of the fifth lens 6 F is the effective focal length of the sixth lens 7 F is the effective focal length of the seventh lens 8 Is the effective focal length of the eighth lens.
7. A large aperture large target surface micro fisheye lens according to claim 3 wherein the optical constants of the materials used for the third lens and the eighth lens satisfy the following conditional expression:
1.50＜nd 3 ＜1.60，30＜vd 3 ＜40；
1.50＜nd 8 ＜1.60，60＜vd 8 ＜70；
where nd 3 、vd 3 Refractive index and Abbe number, nd, of the material used for the third lens 8 、vd 8 Refractive index and abbe number of the material used for the eighth lens.
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| CN107167898A (en) * | 2017-06-29 | 2017-09-15 | 江西联创电子有限公司 | Fish eye lens |
| CN112285878A (en) * | 2019-07-23 | 2021-01-29 | 江西凤凰光学科技有限公司 | Low distortion fisheye lens |
| CN213182176U (en) * | 2020-10-20 | 2021-05-11 | 东莞市宇瞳光学科技股份有限公司 | Black light lens |
| WO2021244313A1 (en) * | 2020-06-02 | 2021-12-09 | 华为技术有限公司 | Optical lens and optical system |
| CN116609927A (en) * | 2023-04-27 | 2023-08-18 | 舜宇光学(中山)有限公司 | Fish-eye lens |
| CN116880040A (en) * | 2023-07-27 | 2023-10-13 | 河南翊轩光电科技有限公司 | Infrared confocal optical lens and imaging device |
| CN220121076U (en) * | 2023-04-27 | 2023-12-01 | 舜宇光学(中山)有限公司 | Fish-eye lens |
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107167898A (en) * | 2017-06-29 | 2017-09-15 | 江西联创电子有限公司 | Fish eye lens |
| CN112285878A (en) * | 2019-07-23 | 2021-01-29 | 江西凤凰光学科技有限公司 | Low distortion fisheye lens |
| WO2021244313A1 (en) * | 2020-06-02 | 2021-12-09 | 华为技术有限公司 | Optical lens and optical system |
| CN213182176U (en) * | 2020-10-20 | 2021-05-11 | 东莞市宇瞳光学科技股份有限公司 | Black light lens |
| CN116609927A (en) * | 2023-04-27 | 2023-08-18 | 舜宇光学(中山)有限公司 | Fish-eye lens |
| CN220121076U (en) * | 2023-04-27 | 2023-12-01 | 舜宇光学(中山)有限公司 | Fish-eye lens |
| CN116880040A (en) * | 2023-07-27 | 2023-10-13 | 河南翊轩光电科技有限公司 | Infrared confocal optical lens and imaging device |
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