CN107450161A - New fish eye lens - Google Patents
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- CN107450161A CN107450161A CN201710835543.9A CN201710835543A CN107450161A CN 107450161 A CN107450161 A CN 107450161A CN 201710835543 A CN201710835543 A CN 201710835543A CN 107450161 A CN107450161 A CN 107450161A
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- 241000251468 Actinopterygii Species 0.000 title abstract 3
- 230000003287 optical effect Effects 0.000 claims abstract description 31
- 238000003384 imaging method Methods 0.000 claims abstract description 29
- 239000011521 glass Substances 0.000 claims abstract description 10
- 230000014509 gene expression Effects 0.000 claims description 13
- 230000005499 meniscus Effects 0.000 claims description 10
- 239000000571 coke Substances 0.000 abstract 6
- 239000003292 glue Substances 0.000 abstract 1
- 230000004075 alteration Effects 0.000 description 16
- 238000010586 diagram Methods 0.000 description 14
- 238000012937 correction Methods 0.000 description 5
- 229920003023 plastic Polymers 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000005357 flat glass Substances 0.000 description 1
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- 238000012544 monitoring process Methods 0.000 description 1
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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
- G02B13/0005—Optical objectives specially designed for the purposes specified below having F-Theta characteristic
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Abstract
The invention discloses a kind of new fish eye lens, include the first lens group with positive light coke successively from thing side to imaging surface along optical axis, diaphragm, and the second lens group with positive light coke, wherein, first lens group includes the lens of curved month type first towards imaging surface with negative power and concave surface, the second lens with negative power, the lens of biconvex the 3rd with positive light coke, and the lens of curved month type the 4th with positive light coke and concave surface towards imaging surface, second lens group includes lens of biconvex the 5th with positive light coke and the lens of curved month type the 6th with negative power and concave surface towards thing side, 5th lens and the 6th lens glue are combined into the lens element with positive light coke, each lens are glass spheric glass, and the optical centre of each lens is located along the same line.New fish eye lens in the present invention can in 40 DEG C~+85 DEG C temperature ranges blur-free imaging, miniaturization can be realized and can realize that multiplying power corrects.
Description
Technical Field
The invention relates to the technical field of cameras, in particular to a novel fisheye lens.
Background
The fisheye lens is a special type of all optical lenses, is a wide-angle lens with a short front lens diameter, is parabolic and protrudes towards the front of the lens, and has an extremely short focal length and an extremely large field angle. Due to the advantage of an overlarge field angle, the method is generally used for shooting and projecting in an environment with a field of view of 120-180 degrees or even larger, the imaging principle is 'non-similar imaging', namely, by introducing quantitative 'distortion', a large inverse far ratio is generated, and the field of view of a lens is increased. The fisheye lens is widely applied to the field of camera shooting such as high-definition motion cameras, unmanned aerial vehicle cameras and panoramic monitoring.
At present, with the development of optical lens technology, although the structural form of the fisheye lens is continuously improved, the basic structure is not changed, and mainly comprises a front group lens and a rear group lens. Moreover, the aberration distortion of the fisheye lens is difficult to correct, so that the imaging quality of the lens is not ideal; and generally speaking, the higher the imaging quality, the higher the resolution, the more lenses are used, which is beneficial for correcting aberration and improving resolution, but the size and cost of the lens are increased. For example, in patent No. CN200810079749, although the field angle of the fisheye lens can reach 240 °, the total optical length L of the entire lens is 60.84mm due to the combination of ten glass spherical lenses, which is not favorable for miniaturization of the entire lens and is relatively high in cost.
In addition, in order to obtain high-pixel imaging, the large wide-angle fish-eye lens must be subjected to magnification chromatic aberration correction, but in the prior art, many fish-eye lens manufacturers adopt many plastic aspheric lenses in the fish-eye lens in order to reduce cost, however, the types of plastics are few, the correction magnification is difficult to achieve, and the plastics are sensitive to temperature, so that the fish-eye lens is difficult to be applied to high-temperature or low-temperature occasions.
Disclosure of Invention
The invention aims to provide a novel fisheye lens which is small and easy to realize magnification correction.
The invention provides a novel fisheye lens, which has the following specific technical scheme:
a novel fisheye lens comprises a first lens group with positive focal power, a diaphragm and a second lens group with positive focal power in sequence from an object side to an imaging surface along an optical axis, wherein,
the first lens group comprises a meniscus-type first lens with negative focal power and a concave surface facing the imaging surface, a second lens with negative focal power, a double-convex third lens with positive focal power and a meniscus-type fourth lens with positive focal power and a concave surface facing the imaging surface in sequence from the object side to the imaging surface;
the second lens group comprises a double-convex fifth lens with positive focal power and a meniscus sixth lens with negative focal power and a concave surface facing to the object side in sequence from the object side to an imaging surface, and the fifth lens and the sixth lens are combined to form a lens element with positive focal power;
the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all glass spherical lenses, and the optical centers of the lenses are positioned on the same straight line;
the novel fisheye lens meets the conditional expression: IH/(f star theta) < 0.2, wherein IH represents the half image height of the novel fisheye lens, f represents the effective focal length of the whole novel fisheye lens, and theta represents the maximum half field angle of the novel fisheye lens.
Compared with the prior art, the novel fisheye lens has the advantages that the structural composition can be miniaturized, and in addition, each lens is a glass spherical lens, so that the magnification correction can be easily realized.
In addition, the novel fisheye lens provided by the invention can also have the following additional technical characteristics:
further, the novel fisheye lens satisfies the conditional expression:wherein,represents the combined power of the second lens group,the focal power of the whole novel fisheye lens is shown.
Further, the novel fisheye lens satisfies the conditional expression:wherein,represents the optical power of the fourth lens,represents the power of the fifth lens.
Further, the novel fisheye lens satisfies the conditional expression:wherein,represents the optical power of the second lens,represents the optical power of the third lens.
Further, the novel fisheye lens satisfies the conditional expression: vd1<41，Vd2＞40，Vd3＜45，Vd4＞50，Vd5>50，Vd6<25, wherein, Vd1、Vd2、Vd3、Vd4、Vd5And Vd6The abbe numbers of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are respectively expressed.
Further, the novel fisheye lens satisfies the conditional expression: d5< D6< D4< D3< D2< D1, wherein D1, D2, D3, D4, D5 and D6 represent the optic diameters of the first, second, third, fourth, fifth and sixth lenses, respectively.
Further, a convex curvature radius of the fourth lens near the object side is smaller than a concave curvature radius near the image plane, and a convex curvature radius of the fifth lens near the object side is larger than a convex curvature radius near the image plane.
Further, the second lens is a meniscus lens with a concave surface facing the imaging surface.
Further, the second lens is a lens with concave surfaces on both sides.
Compared with the prior art, the novel fisheye lens provided by the invention also has the following advantages:
(1) the novel fisheye lens adopts six glass spherical lenses, can clearly image in a temperature range of-40 ℃ to +85 ℃, is suitable for different temperature occasions, and is particularly suitable for the camera shooting fields of extreme sports, unmanned aerial vehicles, vehicles and the like which are harsh to the environment;
(2) the fourth lens adopts a meniscus lens with a concave surface facing an imaging surface, so that a larger chief ray incident angle (CRA) can be realized, and the fourth lens can be matched with a CMOS chip with the CRA being about 30 degrees;
(3) the novel fisheye lens enables imaging to be clear by reasonably configuring the focal power combination among the lenses, and more than 800 ten thousand pixels can be formed;
(4) the field angle of the novel fisheye lens can reach 170 degrees, f-theta distortion can be effectively corrected, the f-theta distortion is controlled to be less than 3 percent, and the requirement of high-definition imaging at an ultra-large field angle can be met.
Drawings
Fig. 1 is a schematic cross-sectional structure view of a novel fisheye lens according to a first embodiment of the invention;
fig. 2 is a schematic view of a field curvature curve of the novel fisheye lens according to the first embodiment of the invention, in which: the x-axis coordinate unit is millimeter and is a curvature of field value, and the y-axis coordinate unit is an angle and corresponds to the field angle of the system;
fig. 3 is a schematic diagram of an on-axis point spherical aberration curve of the novel fisheye lens according to the first embodiment of the invention, in which: the x-axis coordinate unit is millimeter and is a spherical difference value, and the y-axis coordinate unit is an angle and corresponds to the field angle of the system;
fig. 4 is a schematic diagram of a lateral chromatic aberration curve of the novel fisheye lens according to the first embodiment of the invention, in which: the x-axis coordinate unit is micrometer and is the color difference value, and the y-axis coordinate unit is the angle and corresponds to the field angle of the system;
fig. 5 is a field curvature diagram of a novel fisheye lens according to a second embodiment of the invention;
FIG. 6 is a schematic diagram of an on-axis point spherical aberration curve of a novel fisheye lens according to a second embodiment of the invention;
FIG. 7 is a diagram illustrating a lateral chromatic aberration curve of a novel fisheye lens according to a second embodiment of the present invention;
fig. 8 is a schematic cross-sectional view illustrating a novel fisheye lens according to a third embodiment of the invention;
fig. 9 is a field curvature diagram of a novel fisheye lens according to a third embodiment of the invention;
FIG. 10 is a schematic diagram of an on-axis point spherical aberration curve of the novel fisheye lens according to a third embodiment of the invention;
FIG. 11 is a schematic diagram illustrating a lateral chromatic aberration curve of a novel fisheye lens according to a third embodiment of the invention;
fig. 12 is a field curvature diagram of a novel fisheye lens according to a fourth embodiment of the invention;
FIG. 13 is a schematic diagram illustrating an on-axis point spherical aberration curve of the novel fisheye lens according to a fourth embodiment of the invention;
FIG. 14 is a schematic diagram illustrating a lateral chromatic aberration curve of a novel fisheye lens according to a fourth embodiment of the invention;
fig. 15 is a field curvature diagram of a novel fisheye lens according to a fifth embodiment of the invention;
fig. 16 is a schematic diagram of an on-axis point spherical aberration curve of the novel fisheye lens according to the fifth embodiment of the invention;
fig. 17 is a schematic diagram of a lateral chromatic aberration curve of the novel fisheye lens in the fifth embodiment of the invention.
Description of the symbols of the main elements
| First lens group | 10 | Second lens group | 20 |
| Diaphragm | 30 | Optical filter | 40 |
| Sheet glass | 50 | Image plane | 60 |
| First lens | 11 | Second lens | 12 |
| Third lens | 13 | Fourth lens | 14 |
| Fifth lens element | 21 | Sixth lens element | 22 |
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "left," "right," "up," "down," and the like are for illustrative purposes only and do not indicate or imply that the referenced device or element must be in a particular orientation, constructed or operated in a particular manner, and is not to be construed as limiting the present invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, a novel fisheye lens according to an embodiment of the invention includes, in order from an object side to an image plane, a first lens group 10 with positive power, a stop 30, and a second lens group 20 with positive power, wherein,
the first lens group 10 includes, in order from the object side to the image plane, a meniscus type first lens 11 having negative power with a concave surface facing the image plane, a second lens 12 having negative power, a double convex third lens 13 having positive power, and a meniscus type fourth lens 14 having positive power with a concave surface facing the image plane;
the second lens group 20 includes, in order from the object side to the image plane, a double convex fifth lens 21 having positive power and a meniscus sixth lens 22 having negative power with a concave surface facing the object side, the fifth lens 21 and the sixth lens 22 being cemented to constitute a lens element having positive power;
the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 21 and the sixth lens 22 are all glass spherical lenses, and the optical centers of the lenses are located on the same straight line.
The relationship among the diameter D1 of the first lens 11, the diameter D2 of the second lens 12, the diameter D3 of the third lens 13, the diameter D4 of the fourth lens 14, the diameter D5 of the fifth lens 15, and the diameter D6 of the sixth lens 16 is as follows: d5< D6< D4< D3< D2< D1.
Further, in all embodiments of the present invention, F denotes a focal length of the novel fisheye lens, F # denotes an F-number, and r denotes an optical curvatureRadius of curvature of surface vertex, d represents optical surface pitch (distance between two adjacent optical curved surface vertices), ndDenotes a refractive index of each lens, Vd denotes an Abbe number of a material of each lens, TLThe optical total length of the novel fisheye lens is shown.
In the following different embodiments, the relevant parameters of each lens in the novel fisheye lens are referred to the parameter table of each embodiment.
Example 1
Referring to fig. 1, a novel fisheye lens system is provided according to a first embodiment of the invention, wherein in the embodiment of the invention, the second lens element 12 is a meniscus lens element with a concave surface facing an image plane. Referring to fig. 2 to 4, optical characteristic curves of the novel fisheye lens of the present embodiment are respectively shown, wherein relevant parameters of each lens of the novel fisheye lens are shown in table 1.
TABLE 1
Example 2
The schematic cross-sectional structure of the novel fisheye lens provided in the second embodiment of the invention is substantially the same as that of the first embodiment, and is not repeated herein, please refer to fig. 5 to 7, which respectively show the optical characteristic curves of the novel fisheye lens in the present embodiment, wherein the relevant parameters of each lens in the novel fisheye lens are shown in table 2.
TABLE 2
Example 3
Referring to fig. 8, a novel fisheye lens system is provided in accordance with a third embodiment of the present invention, wherein in the present embodiment, the second lens element 12 is a lens element with concave surfaces on both sides.
Referring to fig. 9 to 11, optical characteristic curves of the novel fisheye lens of the present embodiment are respectively shown, wherein relevant parameters of each lens of the novel fisheye lens are shown in table 3.
TABLE 3
Example 4
The schematic cross-sectional structure of the novel fisheye lens provided in the fourth embodiment of the present invention is substantially the same as that of the third embodiment, and reference is made to fig. 12 to 14, which respectively show the optical characteristic curves of the novel fisheye lens in the present embodiment, wherein the relevant parameters of each lens in the novel fisheye lens are shown in table 4.
TABLE 4
Example 5
The schematic cross-sectional structure of the novel fisheye lens provided in the fifth embodiment of the present invention is substantially the same as that of the third embodiment, and reference is made to fig. 15 to 17, which respectively show optical characteristic curves of the novel fisheye lens in the present embodiment, wherein relevant parameters of each lens in the novel fisheye lens are shown in table 5.
TABLE 5
In summary of the above embodiments, the abbe number Vd of the first lens 111<41, abbe number Vd of the second lens 122>40, abbe number Vd of the third lens 133<45, abbe number Vd of the fourth lens 144>50, Abbe number Vd of fifth lens 215>50, abbe number Vd of the sixth lens 226<25。
The convex curvature radius of the fourth lens element 14 is smaller than that of the image plane, and the convex curvature radius of the fifth lens element 21 is larger than that of the image plane.
Since the smaller the data range of the field curvature curve and the on-axis spherical aberration curve is, the better the performance of the lens is, it can be found from the drawings in the embodiments that the range of the field curvature and the on-axis spherical aberration in each embodiment is-0.04 to +0.04, which shows that the field curvature and distortion in each embodiment can be corrected well.
Table 6 shows the 5 embodiments and their corresponding optical characteristics, including the system focal length F, F #, the field angle 2 θ and the total optical length TLAnd a numerical value corresponding to each of the foregoing conditional expressions.
TABLE 6
As can be seen from table 6, the optical total length of the novel fisheye lens is not more than 22.5mm, and the field angle 2 θ is 170 °. The relation among the half-image height IH, the maximum half-field angle theta and the effective focal length f of the system of the novel fisheye lens is as follows: IH/(f tan theta) < 0.2.
Wherein the combined focal power of the second lens group 20Focal power of novel fisheye lensThe ratio range of (A) is:this condition limits the second lens group 20 to have positive focal power, and is mainly used to converge the light passing through the first lens group 10 on the image plane, and balance the distortion aberration of the novel fisheye lens.
Wherein the focal power of the fourth lens 14The focal power of the fifth lens 15The ratio range of (A) is:the fourth lens 14 is a meniscus lens with a concave surface facing the imaging surface, and can realize a larger Chief Ray Angle (CRA), thereby being capable of matching with a CMOS chip with a CRA of about 30 °. Wherein the focal power of the second lens 12And the focal power of the third lens 13The ratio range of the sum is:
in summary, the novel fisheye lens disclosed by the invention adopts a design of six glass spherical lenses, the total optical length of the lens is smaller, the structural composition can realize miniaturization, in addition, because each lens is a glass spherical lens, the magnification correction can be easily realized, the novel fisheye lens is suitable for different temperature and humidity occasions, and clear imaging can be realized within the temperature range of-40 ℃ to +85 ℃, wherein the first lens group can provide a larger field angle, and the second lens group can effectively shorten the total optical length of the lens system, and provide good imaging quality, and is suitable for batch processing production and cost reduction.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. A novel fisheye lens comprises a first lens group with positive focal power, a diaphragm and a second lens group with positive focal power in sequence from an object side to an imaging surface along an optical axis, and is characterized in that:
the first lens group comprises a meniscus-type first lens with negative focal power and a concave surface facing the imaging surface, a second lens with negative focal power, a double-convex third lens with positive focal power and a meniscus-type fourth lens with positive focal power and a concave surface facing the imaging surface in sequence from the object side to the imaging surface;
the second lens group comprises a double-convex fifth lens with positive focal power and a meniscus sixth lens with negative focal power and a concave surface facing to the object side in sequence from the object side to an imaging surface, and the fifth lens and the sixth lens are combined to form a lens element with positive focal power;
the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all glass spherical lenses, and the optical centers of the lenses are positioned on the same straight line;
the novel fisheye lens meets the conditional expression: IH/(f star theta) < 0.2, wherein IH represents the half image height of the novel fisheye lens, f represents the effective focal length of the whole novel fisheye lens, and theta represents the maximum half field angle of the novel fisheye lens.
2. The novel fisheye lens of claim 1, characterized in that: the novel fisheye lens meets the conditional expression:wherein,represents the combined power of the second lens group,the focal power of the whole novel fisheye lens is shown.
3. The novel fisheye lens of claim 1, characterized in that: the novel fisheye lens meets the conditional expression:wherein,represents the optical power of the fourth lens,represents the power of the fifth lens.
4. The novel fisheye lens of claim 1, characterized in that: the novel fisheye lens meets the conditional expression:wherein,represents the optical power of the second lens,represents the optical power of the third lens.
5. The novel fisheye lens of claim 1, characterized in that: the novel fisheye lens meets the conditional expression: vd1<41，Vd2＞40，Vd3＜45，Vd4＞50，Vd5>50，Vd6<25, wherein, Vd1、Vd2、Vd3、Vd4、Vd5And Vd6The abbe numbers of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are respectively expressed.
6. The novel fisheye lens of claim 1, characterized in that: the novel fisheye lens meets the conditional expression: d5< D6< D4< D3< D2< D1, wherein D1, D2, D3, D4, D5 and D6 represent the optic diameters of the first, second, third, fourth, fifth and sixth lenses, respectively.
7. The novel fisheye lens of claim 1, characterized in that: the convex curvature radius of the fourth lens close to the object side is smaller than that of the concave surface close to the imaging surface, and the convex curvature radius of the fifth lens close to the object side is larger than that of the convex surface close to the imaging surface.
8. The novel fisheye lens of any one of claims 1 to 7, characterized in that: the second lens is a meniscus lens with a concave surface facing the imaging surface.
9. The novel fisheye lens of any one of claims 1 to 7, characterized in that: the second lens is a lens with concave surfaces on both sides.
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| CN201710835543.9A CN107450161A (en) | 2017-09-15 | 2017-09-15 | New fish eye lens |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109814239A (en) * | 2019-03-29 | 2019-05-28 | 厦门力鼎光电股份有限公司 | A kind of fish eye lens |
| CN111727396A (en) * | 2017-12-21 | 2020-09-29 | 安特尔耀恩国际有限公司 | Lens system |
| CN113960756A (en) * | 2021-11-01 | 2022-01-21 | 天津津航技术物理研究所 | Fisheye lens |
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