CN116774411B - External fish-eye lens - Google Patents
External fish-eye lens Download PDFInfo
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- CN116774411B CN116774411B CN202311073588.9A CN202311073588A CN116774411B CN 116774411 B CN116774411 B CN 116774411B CN 202311073588 A CN202311073588 A CN 202311073588A CN 116774411 B CN116774411 B CN 116774411B
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- 230000003287 optical effect Effects 0.000 claims abstract description 53
- 238000000034 method Methods 0.000 claims description 2
- 238000003384 imaging method Methods 0.000 description 16
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 230000035945 sensitivity Effects 0.000 description 5
- 230000004075 alteration Effects 0.000 description 3
- 230000000007 visual effect Effects 0.000 description 3
- 239000011521 glass Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 230000002349 favourable effect Effects 0.000 description 1
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Classifications
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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
- G02B13/005—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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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/24—Optical objectives specially designed for the purposes specified below for reproducing or copying at short object distances
Abstract
The application relates to an external fisheye lens, which comprises six lenses in total and sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from an object side to an image side along an optical axis; the first lens has negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens has negative focal power, the object side surface of the second lens is a plane, and the image side surface of the second lens is a concave surface; the third lens has negative focal power, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a concave surface; the fourth lens has positive focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; the fifth lens has positive focal power or negative focal power, the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a concave surface; the sixth lens element has positive refractive power, wherein an object-side surface of the sixth lens element is convex, and an image-side surface of the sixth lens element is convex. The optical system combined by the external fisheye lens and the mobile phone lens has small focal length and large field angle, creates conditions for shooting a large-scale scene in a short distance, and meets the requirement of higher MTF resolution under short-distance shooting.
Description
Technical Field
The application relates to the technical field of lens imaging, in particular to an external fisheye lens.
Background
The fish-eye lens is an extremely wide-angle lens, and is commonly called as a 'fish-eye lens'. In order to maximize the photographing angle of view of the lens, the front lens of such a photographing lens has a short diameter and is projected toward the front of the lens in a parabolic shape, quite similar to the eyes of fish, and thus, a "fish-eye lens" is named. As is known, the shorter the focal length is, the larger the viewing angle is, the fisheye lens is a lens with the focal length of 16mm or less, the fisheye lens has a wider viewing angle, the largest effect of the fisheye lens is that the viewing angle range is large, and the viewing angle can generally reach 180 degrees, which creates conditions for shooting a large-scale scene in a short distance; the fish-eye lens can cause a very strong perspective effect when approaching to the shot object to shoot, and emphasizes the comparison of the near size and the far size of the shot object, so that the shot picture has an infectious force which is shocking by people; the fish-eye lens has quite long depth of field, and is favorable for representing the long depth of field effect of the photo.
However, the existing camera lens of the intelligent terminal such as a mobile phone and a tablet personal computer generally does not have the ultra-wide view angle shooting function of the fisheye lens, so that in order to enable the image captured by the camera lens of the intelligent terminal to have the ultra-wide view angle, the intelligent terminal may achieve the fisheye shooting effect with the aid of software, but the assistance of the software cannot achieve the real image display.
Therefore, the present application provides an external fisheye lens to solve the above problems.
Disclosure of Invention
In order to solve the technical problems, the application provides an external fisheye lens.
The application provides an external fisheye lens which comprises six lenses, wherein the external fisheye lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object side to an image side along an optical axis;
the first lens has negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens has negative focal power, the object side surface of the second lens is a plane, and the image side surface of the second lens is a concave surface;
the third lens has negative focal power, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a concave surface;
the fourth lens element has positive refractive power, wherein an object-side surface of the fourth lens element is convex, and an image-side surface of the fourth lens element is convex;
the fifth lens has positive focal power or negative focal power, the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a concave surface;
the sixth lens element has positive refractive power, wherein an object-side surface thereof is convex, and an image-side surface thereof is convex.
In one embodiment, the optical power of the first lens is Φ1, the optical power of the second lens is Φ2, the optical power of the third lens is Φ3, the optical power of the fourth lens is Φ4, the optical power of the fifth lens is Φ5, the optical power of the sixth lens is Φ6, and the optical power of the external fisheye lens is Φ, which satisfies the following conditions:
94.242＜|φ1/φ|＜6834.938；
91.516＜|φ2/φ|＜4778.464；
145.079＜|φ3/φ|＜31194.654；
491.312＜|φ4/φ|＜28980.629；
274.770＜|φ5/φ|＜17321.532；
343.995＜|φ6/φ|＜20218.094。
in one embodiment, the focal length of the external fisheye lens is F, and the combined focal length of the first lens, the second lens and the third lens is F 123 The combined focal length of the fourth lens, the fifth lens and the sixth lens is F 456 The method comprises the following steps: 0.00002084 < |F 123 /F|＜0.00126944；0.00003381＜|F 456 /F|＜0.00199211。
In one embodiment, the radius of curvature of the object-side surface of the first lens element is R11, the radius of curvature of the image-side surface of the first lens element is R12, and the radius of curvature of the image-side surface of the second lens element is R22, which satisfies the following conditions: 1.712R 11/R12 is less than 4.414; R12/R22 is more than 0.173 and less than 0.342.
In one embodiment, the radius of curvature of the object-side surface of the third lens element is R31, and the radius of curvature of the image-side surface of the third lens element is R32, which satisfies the following conditions: 5.662 < R31/R32 < -5.115.
In one embodiment, the radius of curvature of the object-side surface of the fourth lens element is R41, and the radius of curvature of the image-side surface of the fourth lens element is R42, which satisfies the following conditions: -0.473 < R41/R42 < -0.372.
In one embodiment, the radius of curvature of the object-side surface of the fifth lens element is R51, and the radius of curvature of the image-side surface of the fifth lens element is R52, which satisfies the following conditions: -0.389 < R51/R52 < -0.272.
In one embodiment, the radius of curvature of the object-side surface of the sixth lens element is R61, and the radius of curvature of the image-side surface of the sixth lens element is R62, which satisfies the following conditions: -0.607 < R61/R62 < -0.138.
In one embodiment, the focal length of the external fisheye lens is F, and the total optical length of the external fisheye lens is TTL, which satisfies the following requirements: 15063.870 < F/TTL < 314.373.
In one embodiment, each lens in the external fisheye lens is a spherical lens, and the external fisheye lens further satisfies the following conditional expression:
1.692114≤n1≤1.693500；53.380441≤v1≤54.570492；
1.755000≤n2≤1.772501；49.613485≤v2≤52.322058；
1.755000≤n3≤1.772501；49.613485≤v3≤52.322058；
1.761820≤n4≤1.784721；25.719658≤v4≤26.607986；
1.805180≤n5≤1.846663；23.784819≤v5≤25.456256；
1.487491≤n6≤1.516800；64.198732≤v6≤70.419640；
wherein n1 represents the refractive index of the first lens, and v1 represents the abbe number of the first lens; n2 represents the refractive index of the second lens, v2 represents the abbe number of the second lens; n3 represents the refractive index of the third lens, v3 represents the abbe number of the third lens; n4 represents the refractive index of the fourth lens, v4 represents the abbe number of the fourth lens; n5 represents the refractive index of the fifth lens, v5 represents the abbe number of the fifth lens; n6 represents the refractive index of the sixth lens, and v6 represents the abbe number of the sixth lens.
As can be seen from the technical scheme, the embodiment of the application has at least the following advantages and positive effects:
the external fisheye lens provided by the embodiment of the application adopts six lenses with specific refractive power, and adopts specific surface shape collocation and reasonable focal power distribution, so that the structure is more compact while the high pixels are satisfied, and the equalization of miniaturized high pixels of the lens is better realized. The external fisheye lens provided by the application has the advantages that on the premise of being matched with the mobile phone lens to improve the imaging quality of the mobile phone, the focal length of the optical system combined by the external fisheye lens and the mobile phone lens is small, the visual angle of the optical system is large, conditions are created for shooting a large-scale scene in a short distance, and a very strong perspective effect can be caused when the external fisheye lens is close to a shot object. The external fisheye lens also meets the requirements of smaller distortion and higher MTF resolution under close-range shooting.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an external fisheye lens according to a first embodiment of the application;
FIG. 2 is a graph showing a field curvature of an external fisheye lens according to a first embodiment of the application;
FIG. 3 is a graph showing distortion curves of an external fisheye lens according to a first embodiment of the application;
FIG. 4 is a graph showing the MTF of an external fisheye lens of the first embodiment of the application;
fig. 5 is a schematic structural diagram of an external fisheye lens according to a second embodiment of the application;
FIG. 6 is a graph showing a field curvature of an external fisheye lens according to a second embodiment of the application;
FIG. 7 is a graph showing distortion curves of an external fisheye lens according to a second embodiment of the application;
FIG. 8 is a graph showing the MTF of an external fisheye lens of a second embodiment of the application;
fig. 9 is a schematic structural diagram of an external fisheye lens according to a third embodiment of the application;
FIG. 10 is a graph showing a field curvature of an external fisheye lens according to a third embodiment of the application;
FIG. 11 is a graph showing distortion curves of an external fisheye lens according to a third embodiment of the application;
fig. 12 is an MTF graph of an external fisheye lens of a third embodiment of the application.
Detailed Description
Exemplary embodiments that embody features and advantages of the present application will be described in detail in the following description. It will be understood that the application is capable of various modifications in various embodiments, all without departing from the scope of the application, and that the description and illustrations herein are intended to be by way of illustration only and not to be construed as limiting the application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Referring to fig. 1, the present application provides an external fisheye lens, the number of lenses of the external fisheye lens is six, the external fisheye lens is composed of a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6, which are sequentially arranged from an object side to an image side along an optical axis, as an alternative way, all lenses in the external fisheye lens may be glass spherical lenses, and by setting six lenses as spherical lenses, axial aberration and vertical chromatic aberration of a system can be effectively reduced. And, the correction of the Wen Xiawen drift of the height is facilitated by adopting glass lenses for all six lenses. The six lenses are spherical lenses, so that the cost of the lens is reduced. Wherein, the schematic T in the figure represents transverse light and S represents longitudinal light.
The first lens element L1 has negative refractive power, and has a convex object-side surface and a concave image-side surface.
The second lens element L2 has negative refractive power, wherein an object-side surface thereof is a plane, and an image-side surface thereof is a concave surface.
The third lens element L3 has negative refractive power, and has a concave object-side surface and a concave image-side surface.
The fourth lens element L4 has positive refractive power, wherein an object-side surface thereof is convex, and an image-side surface thereof is convex;
the fifth lens element L5 has positive or negative refractive power, wherein an object-side surface thereof is a concave surface, and an image-side surface thereof is a concave surface;
the sixth lens element L6 has positive refractive power, and has a convex object-side surface and a convex image-side surface.
Specifically, the optical power is equal to the difference between the convergence of the image side beam and the convergence of the object side beam, which characterizes the ability of the optical system to deflect light. The greater the absolute value of the optical power, the greater the ability to bend the light, the smaller the absolute value of the optical power, and the weaker the ability to bend the light. When the focal power is positive, the refraction of the light rays is convergent; when the optical power is negative, the refraction of the light is divergent. The optical power may be suitable for characterizing a refractive surface of a lens (i.e. a surface of a lens), for characterizing a lens, or for characterizing a system of lenses together (i.e. a lens group).
In some embodiments, the first lens has an optical power of φ 1, the second lens has an optical power of φ 2, the third lens has an optical power of φ 3, the fourth lens has an optical power of φ 4, the fifth lens has an optical power of φ 5, the sixth lens has an optical power of φ 6, and the external fisheye lens has an optical power of φ. The focal power of each lens in the external fisheye lens meets the following conditional expression: 94.242 < |Phi1/Phi < 6834.938;91.516 < |phi 2/phi| < 4778.464;145.079 < |phi 3/phi| < 31194.654;491.312 < |Phi4/Phi < 28980.629;274.770 < |phi 5/phi| < 17321.532;343.995 < |Phi6/Phi < 20218.094. According to the embodiment of the application, through reasonable distribution of the focal power of each lens, light smoothly transits to the imaging surface in the mobile phone lens, so that the aberration is reduced, the imaging quality is improved, the assembly tolerance is reduced, and the generation yield is improved. Taking Iphone14PRO as an example, after the external fisheye lens is combined with the application, the integral focal length of the optical system can reach about 2.5mm, the angle of view is close to 200 degrees, the focal length of the combined optical system is small, the visual angle of the optical system is large, and conditions are created for shooting a large-scale scene in a short distance.
The external fisheye lens provided by the embodiment of the application adopts six lenses with specific refractive power, and adopts specific surface shape collocation and reasonable focal power distribution, so that the structure is more compact while the high pixels are satisfied, and the equalization of miniaturized high pixels of the lens is better realized. The external fisheye lens provided by the application has the advantages that on the premise of being matched with the mobile phone lens to improve the imaging quality of the mobile phone, the focal length of an optical system combined by the external fisheye lens and the mobile phone lens is small (close to 2.5 mm), the visual angle of the optical system is large (close to 200 ℃), conditions are created for shooting a large-scale scene in a short distance, and a very strong perspective effect can be caused when the lens is close to a shot object. The external fisheye lens also meets the requirements of smaller distortion and higher MTF resolution under close-range shooting.
Further, in some embodiments, the focal length of the external fisheye lens is defined as F, and the combined focal length of the first lens, the second lens, and the third lens is defined as F 123 The combined focal length of the fourth lens, the fifth lens and the sixth lens is F 456 The external fisheye lens also meets the following conditional expression: 0.00002084 < |F 123 /F|＜0.00126944；0.00003381＜|F 456 /F|＜0.00199211。
In some embodiments, the radius of curvature of the object-side surface of the first lens is R11, the radius of curvature of the image-side surface of the first lens is R12, and the radius of curvature of the image-side surface of the second lens is R22, satisfying: 1.712R 11/R12 is less than 4.414; R12/R22 is more than 0.173 and less than 0.342. The lens imaging system meets the conditional expression, can reduce the sensitivity of the lens, improves the yield of products and reduces the imaging distortion degree of the lens.
In some embodiments, the radius of curvature of the object-side surface of the third lens element is R31, and the radius of curvature of the image-side surface of the third lens element is R32, which satisfies the following: 5.662 < R31/R32 < -5.115. The lens imaging system meets the conditional expression, can reduce the sensitivity of the lens, improves the yield of products and reduces the imaging distortion degree of the lens.
In some embodiments, the radius of curvature of the object-side surface of the fourth lens element is R41, and the radius of curvature of the image-side surface of the fourth lens element is R42, which satisfies the following conditions: -0.473 < R41/R42 < -0.372. The lens imaging system meets the conditional expression, can reduce the sensitivity of the lens, improves the yield of products and reduces the imaging distortion degree of the lens.
In some embodiments, the radius of curvature of the object-side surface of the fifth lens element is R51, and the radius of curvature of the image-side surface of the fifth lens element is R52, which satisfies the following: -0.389 < R51/R52 < -0.272. The lens imaging system meets the conditional expression, can reduce the sensitivity of the lens, improves the yield of products and reduces the imaging distortion degree of the lens.
In some embodiments, the radius of curvature of the object-side surface of the sixth lens element is R61, and the radius of curvature of the image-side surface of the sixth lens element is R62, which satisfies the following: -0.607 < R61/R62 < -0.138. The lens imaging system meets the conditional expression, can reduce the sensitivity of the lens, improves the yield of products and reduces the imaging distortion degree of the lens.
In some embodiments, the focal length of the external fisheye lens is F, the optical total length of the external fisheye lens is TTL, and the external fisheye lens satisfies: 15063.870 < F/TTL < 314.373. In the embodiment of the application, the overall structure of the lens system can be more compact by controlling the thickness of the lens and the air interval between the lenses on the optical axis, the total optical length can be effectively compressed, and the volume of the tele lens can be reduced. Wherein F represents the effective focal length of the external fisheye lens, and TTL represents the total optical length of the external fisheye lens. The condition that F/TTL is smaller than 15063.870 and smaller than 314.373 is satisfied, so that the effective focal length value of the optical system combined by the external fisheye lens and the mobile phone lens can be controlled within a short focal interval range when the external fisheye lens is matched with the mobile phone lens, the field angle is increased, the optical system can shoot a large-scale scene at a short distance, and a very strong perspective effect can be caused when the optical system is close to a shot object. The distortion degree of the external fisheye lens meeting the condition is smaller, the MTF resolution is higher, and the imaging quality is better.
In some embodiments, the external fisheye lens further satisfies the following conditional expression:
1.692114≤n1≤1.693500；53.380441≤v1≤54.570492；
1.755000≤n2≤1.772501；49.613485≤v2≤52.322058；
1.755000≤n3≤1.772501；49.613485≤v3≤52.322058；
1.761820≤n4≤1.784721；25.719658≤v4≤26.607986；
1.805180≤n5≤1.846663；23.784819≤v5≤25.456256；
1.487491≤n6≤1.516800；64.198732≤v6≤70.419640。
n1 denotes a refractive index of the first lens L1, v1 denotes an abbe number of the first lens L1;
n2 denotes the refractive index of the second lens L2, v2 denotes the abbe number of the second lens L2;
n3 denotes a refractive index of the third lens L3, v3 denotes an abbe number of the third lens L3;
n4 denotes a refractive index of the fourth lens L4, v4 denotes an abbe number of the fourth lens L4;
n5 denotes the refractive index of the fifth lens L5, and v5 denotes the abbe number of the fifth lens L5.
n6 denotes the refractive index of the sixth lens L6, and v6 denotes the abbe number of the sixth lens L6.
First embodiment
Fig. 1 is a schematic structural diagram of an external fisheye lens according to a first embodiment of the present application.
The external fisheye lens sequentially comprises from an object side to an image side along an optical axis: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6.
The first lens element L1 has negative refractive power, and has a convex object-side surface and a concave image-side surface.
The second lens element L2 has negative refractive power, wherein an object-side surface thereof is a plane, and an image-side surface thereof is a concave surface.
The third lens element L3 has negative refractive power, and has a concave object-side surface and a concave image-side surface.
The fourth lens element L4 has positive refractive power, wherein an object-side surface thereof is convex, and an image-side surface thereof is convex;
the fifth lens element L5 has negative refractive power, wherein an object-side surface thereof is concave, and an image-side surface thereof is concave;
the sixth lens element L6 has positive refractive power, and has a convex object-side surface and a convex image-side surface.
The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all spherical lenses.
The parameters of the external fisheye lens provided in this embodiment are shown in table 1, where R represents the radius of curvature, D represents the optical surface spacing, nd represents the refractive index of the material, and Vd represents the abbe number of the material.
Table 1 external fisheye lens parameters of the first embodiment
In this embodiment, the effective focal length F of the whole system of the external fisheye lens is-387500 mm.
The field curve, distortion curve and MTF curve of the external fisheye lens refer to fig. 2 to 4. Fig. 2 illustrates a field curvature graph of an external fisheye lens, the horizontal axis represents the offset (unit: micrometers), and the vertical axis represents the angle of view (unit: degrees), and as can be seen from fig. 2, the field curvature of the meridional image plane and the sagittal image plane is controlled within ±12 micrometers, which indicates that the field curvature of the optical lens is better corrected. Fig. 3 illustrates a distortion graph of an external fisheye lens, and as can be seen from fig. 3, the distortion of the optical lens is well corrected. Fig. 4 illustrates the MTF graph of an external fisheye lens, and as can be seen from fig. 4, the OTF coefficient of the external fisheye lens is greater than 0.88 at a spatial frequency of 40mm, which indicates a higher resolution.
Second embodiment
Fig. 5 is a schematic structural diagram of an external fisheye lens according to a second embodiment of the present application.
The external fisheye lens sequentially comprises from an object side to an image side along an optical axis: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6.
The first lens element L1 has negative refractive power, and has a convex object-side surface and a concave image-side surface.
The second lens element L2 has negative refractive power, wherein an object-side surface thereof is a plane, and an image-side surface thereof is a concave surface.
The third lens element L3 has negative refractive power, and has a concave object-side surface and a concave image-side surface.
The fourth lens element L4 has positive refractive power, wherein an object-side surface thereof is convex, and an image-side surface thereof is convex;
the fifth lens element L5 has negative refractive power, wherein an object-side surface thereof is concave, and an image-side surface thereof is concave;
the sixth lens element L6 has positive refractive power, and has a convex object-side surface and a convex image-side surface.
The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all spherical lenses.
The parameters of the external fisheye lens provided in this embodiment are shown in table 2, where R represents the radius of curvature, D represents the optical surface spacing, nd represents the refractive index of the material, and Vd represents the abbe number of the material.
Table 2 external fisheye lens parameters of the second embodiment
In this embodiment, the effective focal length F of the entire system of the external fisheye lens is 6611.589mm.
The field curve, distortion curve and MTF curve of the external fisheye lens refer to fig. 6 to 8. Fig. 6 illustrates a field curvature graph of an external fisheye lens, the horizontal axis represents the offset (unit: micrometers), and the vertical axis represents the angle of view (unit: degrees), and as can be seen from fig. 6, the field curvature of the meridional image plane and the sagittal image plane is controlled within ±13 micrometers, which indicates that the field curvature of the optical lens is better corrected. Fig. 7 illustrates a distortion graph of an external fisheye lens, and as can be seen from fig. 7, the distortion of the optical lens is well corrected. Fig. 8 illustrates the MTF graph of an external fisheye lens, and as can be seen from fig. 8, the OTF coefficient of the external fisheye lens is greater than 0.88 at a spatial frequency of 40mm, which indicates a higher resolution.
Third embodiment
Fig. 9 is a schematic structural diagram of an external fisheye lens according to a third embodiment of the present application.
The external fisheye lens sequentially comprises from an object side to an image side along an optical axis: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6.
The first lens element L1 has negative refractive power, and has a convex object-side surface and a concave image-side surface.
The second lens element L2 has negative refractive power, wherein an object-side surface thereof is a plane, and an image-side surface thereof is a concave surface.
The third lens element L3 has negative refractive power, and has a concave object-side surface and a concave image-side surface.
The fourth lens element L4 has positive refractive power, wherein an object-side surface thereof is convex, and an image-side surface thereof is convex;
the fifth lens element L5 has positive refractive power, wherein an object-side surface thereof is concave, and an image-side surface thereof is concave;
the sixth lens element L6 has positive refractive power, and has a convex object-side surface and a convex image-side surface.
The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all spherical lenses.
The parameters of the external fisheye lens provided in this embodiment are shown in table 3, where R represents the radius of curvature, D represents the optical surface spacing, nd represents the refractive index of the material, and Vd represents the abbe number of the material.
TABLE 3 external fisheye lens parameters for third embodiment
In this embodiment, the effective focal length F of the entire system of the external fisheye lens is 7826.015mm.
The field curve, distortion curve, MTF curve of the external fisheye lens refer to fig. 10 to 12. Fig. 10 illustrates a field curvature graph of an external fisheye lens, wherein the horizontal axis represents the offset (unit: mm) and the vertical axis represents the angle of view (unit: degree), and as can be seen from fig. 10, the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.2 mm, which indicates that the field curvature of the optical lens is better corrected. Fig. 11 illustrates a distortion graph of an external fisheye lens, and as can be seen from fig. 11, the distortion of the optical lens is well corrected. Fig. 12 illustrates the MTF graph of an external fisheye lens, and as can be seen from fig. 12, the OTF coefficient of the external fisheye lens is greater than 0.88 at a spatial frequency of 40mm, which indicates a higher resolution.
Three examples of integrated external fisheye lenses are summarized in table 4 below.
Table 4 parameter summary and comparison table for various embodiments of external fisheye lens
While the application has been described with reference to several exemplary embodiments, it is to be understood that the terminology used is intended to be in the nature of words of description and of limitation. As the present application may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.
Claims (9)
1. The external fisheye lens is characterized by comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object side to an image side along an optical axis;
the first lens has negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens has negative focal power, the object side surface of the second lens is a plane, and the image side surface of the second lens is a concave surface;
the third lens has negative focal power, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a concave surface;
the fourth lens element has positive refractive power, wherein an object-side surface of the fourth lens element is convex, and an image-side surface of the fourth lens element is convex;
the fifth lens has negative focal power, the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a concave surface;
the sixth lens element with positive refractive power has a convex object-side surface and a convex image-side surface;
the focal power of the first lens is phi 1, the focal power of the second lens is phi 2, the focal power of the third lens is phi 3, the focal power of the fourth lens is phi 4, the focal power of the fifth lens is phi 5, the focal power of the sixth lens is phi 6, the focal power of the external fisheye lens is phi, and the requirements are met:
94.242＜|φ1/φ|＜6834.938；
91.516＜|φ2/φ|＜4778.464；
145.079＜|φ3/φ|＜31194.654；
491.312＜|φ4/φ|＜28980.629；
274.770＜|φ5/φ|＜17321.532；
343.995＜|φ6/φ|＜20218.094。
2. the external fisheye lens of claim 1 wherein the external fisheye lens has a focal length F and the combined focal length of the first lens, the second lens, and the third lens is F 123 The combined focal length of the fourth lens, the fifth lens and the sixth lens is F 456 The method comprises the following steps:
0.00002084＜|F 123 /F|＜0.00126944；
0.00003381＜|F 456 /F|＜0.00199211。
3. the external fisheye lens of claim 1, wherein the radius of curvature of the object side of the first lens is R11, the radius of curvature of the image side of the first lens is R12, and the radius of curvature of the image side of the second lens is R22, satisfying: 1.712R 11/R12 is less than 4.414; R12/R22 is more than 0.173 and less than 0.342.
4. The external fisheye lens of claim 1, wherein the radius of curvature of the object side of the third lens is R31 and the radius of curvature of the image side of the third lens is R32, and the following is satisfied: 5.662 < R31/R32 < -5.115.
5. The external fisheye lens of claim 1, wherein the radius of curvature of the object side of the fourth lens element is R41 and the radius of curvature of the image side of the fourth lens element is R42, and wherein: -0.473 < R41/R42 < -0.372.
6. The external fisheye lens of claim 1, wherein the radius of curvature of the object side of the fifth lens element is R51, and the radius of curvature of the image side of the fifth lens element is R52, and wherein: -0.389 < R51/R52 < -0.272.
7. The external fisheye lens of claim 1, wherein the radius of curvature of the object side of the sixth lens is R61 and the radius of curvature of the image side of the sixth lens is R62, satisfying: -0.607 < R61/R62 < -0.138.
8. The external fisheye lens of claim 1 wherein the focal length of the external fisheye lens is F and the total optical length of the external fisheye lens is TTL, satisfying: 15063.870 < F/TTL < 314.373.
9. The external fisheye lens of claim 1 wherein each lens in the external fisheye lens is a spherical lens, the external fisheye lens further satisfying the following conditional expression:
1.692114≤n1≤1.693500；53.380441≤v1≤54.570492；
1.755000≤n2≤1.772501；49.613485≤v2≤52.322058；
1.755000≤n3≤1.772501；49.613485≤v3≤52.322058；
1.761820≤n4≤1.784721；25.719658≤v4≤26.607986；
1.805180≤n5≤1.846663；23.784819≤v5≤25.456256；
1.487491≤n6≤1.516800；64.198732≤v6≤70.419640；
wherein n1 represents the refractive index of the first lens, and v1 represents the abbe number of the first lens; n2 represents the refractive index of the second lens, v2 represents the abbe number of the second lens; n3 represents the refractive index of the third lens, v3 represents the abbe number of the third lens; n4 represents the refractive index of the fourth lens, v4 represents the abbe number of the fourth lens; n5 represents the refractive index of the fifth lens, v5 represents the abbe number of the fifth lens; n6 represents the refractive index of the sixth lens, and v6 represents the abbe number of the sixth lens.
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| CN103676101A (en) * | 2013-07-10 | 2014-03-26 | 玉晶光电(厦门)有限公司 | Optical imaging lens and electronic device with the application of optical imaging lens |
| CN106802467A (en) * | 2016-12-14 | 2017-06-06 | 瑞声科技(新加坡)有限公司 | Camera optical camera lens |
| CN106974563A (en) * | 2016-01-19 | 2017-07-25 | 扬州市海牛厨房设备有限公司 | A kind of convenient desktop fryer with fuel outlet valve |
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| CN103293637A (en) * | 2013-02-06 | 2013-09-11 | 玉晶光电(厦门)有限公司 | Five-patch type optical imaging lens and electronic device using same |
| CN103676101A (en) * | 2013-07-10 | 2014-03-26 | 玉晶光电(厦门)有限公司 | Optical imaging lens and electronic device with the application of optical imaging lens |
| CN106974563A (en) * | 2016-01-19 | 2017-07-25 | 扬州市海牛厨房设备有限公司 | A kind of convenient desktop fryer with fuel outlet valve |
| CN106802467A (en) * | 2016-12-14 | 2017-06-06 | 瑞声科技(新加坡)有限公司 | Camera optical camera lens |
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