CN114578528A - Super wide angle big light ring aspheric surface camera lens - Google Patents
Super wide angle big light ring aspheric surface camera lens Download PDFInfo
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- CN114578528A CN114578528A CN202210277992.7A CN202210277992A CN114578528A CN 114578528 A CN114578528 A CN 114578528A CN 202210277992 A CN202210277992 A CN 202210277992A CN 114578528 A CN114578528 A CN 114578528A
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- 230000005499 meniscus Effects 0.000 claims description 17
- 230000003287 optical effect Effects 0.000 claims description 12
- 239000011521 glass Substances 0.000 claims description 8
- 230000004075 alteration Effects 0.000 description 9
- 238000005452 bending Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000003384 imaging method Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000035945 sensitivity 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
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
-
- 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
- G02B13/009—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras having zoom function
-
- 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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/142—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having two groups only
- G02B15/1421—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having two groups only the first group being positive
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/22—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with movable lens means specially adapted for focusing at close distances
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The invention relates to an ultra-wide-angle large-aperture aspheric lens, which comprises a first lens group, an iris diaphragm and a second lens group which are sequentially arranged along the incident direction of light rays; wherein the first lens group has a positive power position that does not move; the second lens group has a moving positive power position; and a focal length value f1 of the first lens group and a focal length value f2 of the second lens group satisfy 1.5 < f1/f2 < 2. Thus, the lens has the advantages of large aperture, small total length, small distortion, high resolution and capability of focusing at a short distance.
Description
Technical Field
The invention belongs to the technical field of lenses, and particularly relates to an ultra-wide-angle large-aperture aspheric lens.
Background
With the development of society, people have more and more demands on video shooting and higher requirements on video lenses; such as: the important indexes of the commonly used short-focus video lens are high definition, large light flux of a large aperture, good chromatic aberration expression and small distortion. However, the applicant found that: the existing short-focus video lens in the current market has the defects of low resolution, large distortion, small aperture, long shooting close-up distance and the like, seriously influences the shooting quality, and cannot meet the high-quality short-focus video shooting requirement at all.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the super-wide-angle large-aperture aspheric lens which has a large aperture, a small total length, small distortion and high resolution and can focus in a short distance.
In order to solve the technical problems, the invention adopts the following technical scheme:
an ultra-wide-angle large-aperture aspheric lens comprises a first lens group, an iris diaphragm and a second lens group which are sequentially arranged along the incident direction of light; wherein,
the first lens group has a positive power position that does not move;
the second lens group has a moving positive power position;
further, the first lens group and the second lens group satisfy the following formula:
1.5＜f1/f2＜2
wherein f1 is the focal length of the first lens group, and f2 is the focal length of the second lens group.
Further, the first lens group and the second lens group are both composed of 7 lenses, wherein the refractive index of at least one lens in the first lens group is greater than 1.4 and less than 1.6, the refractive index of at least five lenses in the first lens group is greater than 1.8 and less than 2, and the refractive index of at least three lenses in the second lens group G2 is greater than 1.8 and less than 1.9.
Furthermore, the abbe number of at least four lenses in the second lens group is more than 30 and less than 50.
Further, the first lens group comprises two large-bending meniscus lenses, and the second lens and the fourteenth lens counted from the incident direction of light in the optical system formed by the first lens group and the second lens group are glass aspheric lenses.
Further, the second lens group includes a piece of cemented triplet.
Further, the total optical length of the lens is more than 89.5 millimeters and less than 91.5 millimeters.
The invention has the beneficial effects that:
1. according to the technical scheme, the large aperture, the small aperture and the total length can be realized, the small distortion and the high resolution can be realized, and the focusing can be performed in a short distance.
2. The invention adopts two meniscus lenses with larger bending in the first lens group, and simultaneously, the second lens and the fourteenth lens counted from the incident direction of light in the optical system are glass aspheric lenses. Therefore, on one hand, the field angle can be optimized and enlarged (L11 and L12 are both meniscus lenses with large bending, the convex surfaces face to the object side, so that the incident angle of the optical system to the object side light is enlarged), and on the other hand, the added aspheric surface can effectively optimize and improve the MTF.
In a possible implementation manner, the second lens group includes a cemented triplet (i.e., a lens composed of three lenses), which can effectively optimize apochromatism, thereby improving the imaging resolution of the lens and making the image quality more vivid.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of an ultra-wide-angle large-aperture aspheric lens according to the present invention;
FIG. 2 is a longitudinal chromatic aberration diagram of an embodiment of an ultra-wide-angle large-aperture aspheric lens according to the invention;
FIG. 3 is a lateral chromatic aberration diagram of an embodiment of an ultra-wide-angle large-aperture aspheric lens according to the invention;
FIG. 4 is a schematic diagram illustrating curvature of field distortion of an embodiment of an ultra-wide-angle large-aperture aspheric lens according to the invention;
FIG. 5 is a speckle pattern of an embodiment of an ultra-wide angle large aperture aspheric lens according to the present invention;
FIG. 6 is an MTF graph of an embodiment of an ultra-wide angle large aperture aspheric lens of the present invention;
fig. 7 is a MTF defocus graph of an embodiment of an ultra-wide-angle large-aperture aspheric lens according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention discloses an ultra-wide-angle large-aperture aspheric lens which comprises a first lens group, an iris diaphragm and a second lens group which are sequentially arranged along the incident direction of light. Wherein,
the first lens group has a positive power position that does not move;
the second lens group has a moving positive power position;
further, the first lens group and the second lens group satisfy the following formula:
1.5＜f1/f2＜2
wherein f1 is the focal length of the first lens group, and f2 is the focal length of the second lens group.
In a possible implementation manner, the refractive index of at least one lens in the first lens group is greater than 1.4 and less than 1.6, the refractive index of at least five lenses in the first lens group is greater than 1.8 and less than 2, and the refractive index of at least three lenses in the second lens group is greater than 1.8 and less than 1.9.
The abbe number of at least four lenses of the second lens group is more than 30 and less than 50.
By adopting the structure, the super-wide-angle large-aperture aspheric lens can realize small total length of a large aperture, can realize small distortion high resolution on the second aspect, and can focus at a short distance on the third aspect, thereby solving the problems of optimizing small distortion and good chromatic aberration and meeting the shooting requirement of a near end under the condition of meeting the shooting requirements of high resolution and a large aperture in the whole working distance of an optical system.
In one possible implementation manner, the first lens group comprises two relatively curved meniscus lenses, and the second lens and the fourteenth lens counted from the incident direction of the light in the optical system formed by the first lens group and the second lens group are both glass aspheric lenses. Therefore, on one hand, the field angle can be optimized and enlarged (L11 and L12 are both meniscus lenses with large bending, the convex surfaces face to the object side, so that the incident angle of the optical system to the object side light is enlarged), and on the other hand, the added aspheric surface can effectively optimize and improve the MTF.
In a possible implementation manner, the second lens group includes a cemented triplet (i.e., a lens composed of three lenses), which can effectively optimize apochromatism, thereby improving the imaging resolution of the lens and making the image quality more vivid.
In one possible implementation, the total optical length of the lens is greater than 89.5 millimeters and less than 91.5 millimeters.
The following description will be made of the super-wide-angle large-aperture aspheric lens according to the present invention by using specific embodiments.
Referring to fig. 1, the super-wide-angle large-aperture aspheric lens of the embodiment of the present invention is a lens with a focal length of 9mm, and includes a first lens group G1 and a second lens group G2 sequentially disposed along a light incident direction, where the first lens group G1 is a lens group with fixed positive focal power and no movement, which is composed of 7 lenses, the second lens group G2 is a lens group with fixed positive focal power and is a movable focusing group, which is composed of 7 lenses, the second lens of the first lens group G1 from the light incident direction is a glass aspheric lens, and the seventh lens of the second lens group G2 from the light incident direction is a glass aspheric lens. The method comprises the following specific steps: the first lens group G1 consists of a lens L11, a lens L12, a lens L13, a lens L14, a lens L15, a lens L16 and a lens L17, and the second lens group G2 consists of a lens L21, a lens L22, a lens L23, a lens L24, a lens L25, a lens L26 and a lens L27; wherein the lens L11 is a meniscus lens with a negative focal power and a convex surface facing the object, the lens L12 is a meniscus lens with a negative focal power and a convex surface facing the object, the lens L13 is a biconcave negative focal power lens, the lens L14 is a biconvex positive focal power lens, the lens L15 is a biconcave negative focal power lens, the lens L16 is a plano-convex lens with a positive focal power and a convex surface facing the object, the lens L17 is a biconvex positive focal power lens, the lens L21 is a meniscus lens with a positive focal power and a convex surface facing the image, the lens L22 is a plano-concave lens with a negative focal power and a concave surface facing the object, the lens L23 is a meniscus lens with a negative focal power and a convex surface facing the object, the lens L24 is a positive focal power lens, the lens L25 is a meniscus lens with a negative focal power and a convex surface facing the image, the lens L3 is a positive focal power lens 73742, and the lens L12 and the lens L27 are glass aspheric lenses, and the lens L23, the lens L24 and the lens L25 form a triple cemented lens. The specific parameters of each lens in this example of the invention are shown in table 1 below.
TABLE 1
The parameters of the two glass aspherical lenses (lens L12 and lens L27) are specifically shown in table 2 below.
TABLE 2
The ultra-wide-angle large-aperture aspheric lens disclosed by the embodiment of the invention is subjected to longitudinal chromatic aberration, transverse chromatic aberration, field curvature distortion, diffuse spot, MTF and MTF defocus tests, the test results are shown in fig. 2-7, and it can be known from fig. 2-7 that the aberration correction of the optical system of the lens of the embodiment is good (wherein the longitudinal chromatic aberration is controlled within 0.055mm from 435mm to 656mm, and the transverse chromatic aberration is controlled within 5 um), the distortion is small (the optical distortion is less than-1.6%) and the resolution is high (the MTF curve can be seen to be capable of matching more than twenty million pixel chips).
Therefore, the lens of the embodiment of the invention can realize short focal length, large aperture, short total length, small distortion and high resolution, and the lenses L22 to L27 of the second lens group G2 all use compact structures (detailed in Table 1) which compress the lens spacing to an extremely short total length, thereby greatly reducing the sensitivity of tolerance for the subsequent process assembly, improving the yield of mass production and reducing the production cost.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (7)
1. An ultra-wide-angle large-aperture aspheric lens is characterized by comprising a first lens group, an iris diaphragm and a second lens group which are sequentially arranged along the incident direction of light; wherein,
the first lens group has a positive power position that does not move;
the second lens group has a moving positive power position;
further, the first lens group and the second lens group satisfy the following formula:
1.5＜f1/f2＜2
wherein f1 is the focal length of the first lens group, and f2 is the focal length of the second lens group.
2. The super wide-angle large aperture aspherical lens as claimed in claim 1, wherein the first lens group and the second lens group are each composed of 7 lenses, wherein at least one lens of the first lens group has a refractive index of more than 1.4 and less than 1.6, and at least five lenses have a refractive index of more than 1.8 and less than 2, and at least three lenses of the second lens group has a refractive index of more than 1.8 and less than 1.9.
3. The super-wide angle large aperture aspheric lens as claimed in claim 2, wherein the abbe number of at least four lenses of the second lens group is greater than 30 and less than 50.
4. The super-wide angle large aperture aspherical lens according to claim 2 or 3, wherein the first lens group comprises two curved meniscus lenses, and the second lens and the fourteenth lens in the optical system constituted by the first lens group and the second lens group are both glass aspherical lenses as counted from the light incidence direction.
5. The super-wide angle large aperture aspherical lens of claim 2 or 3, wherein the second lens group comprises a cemented triplet.
6. The super-wide angle large aperture aspheric lens as claimed in claim 1, 2 or 3, characterized in that the total optical length of the lens is more than 89.5 mm and less than 91.5 mm.
7. The super-wide angle large aperture aspherical lens according to claim 2 or 3, wherein the first lens group is composed of lens L11, lens L12, lens L13, lens L14, lens L15, lens L16 and lens L17, and the second lens group is composed of lens L21, lens L22, lens L23, lens L24, lens L25, lens L26 and lens L27; wherein the lens L11 is a negative power meniscus lens with the convex surface facing the object, the lens L12 is a negative power meniscus lens with the convex surface facing the object, the lens L13 is a biconcave negative power lens, the lens L14 is a biconvex positive power lens, the lens L15 is a biconcave negative power lens, the lens L16 is a plano-convex lens with positive power and convex surface facing the object, the lens L17 is a biconvex positive power lens, the lens L21 is a meniscus lens with positive power with the convex surface facing the image, the lens L22 is a plano-concave lens with a negative power and a concave surface facing the object, the lens L23 is a meniscus lens with a negative power and a convex surface facing the object, the lens L24 is a biconvex positive power lens, the lens L25 is a meniscus lens with negative power having a convex surface facing the image, the lens L26 is a biconvex positive power lens, and the lens L27 is a meniscus lens having a negative power with a convex surface facing the image side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210277992.7A CN114578528A (en) | 2022-03-21 | 2022-03-21 | Super wide angle big light ring aspheric surface camera lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210277992.7A CN114578528A (en) | 2022-03-21 | 2022-03-21 | Super wide angle big light ring aspheric surface camera lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114578528A true CN114578528A (en) | 2022-06-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210277992.7A Pending CN114578528A (en) | 2022-03-21 | 2022-03-21 | Super wide angle big light ring aspheric surface camera lens |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115808771A (en) * | 2022-12-30 | 2023-03-17 | 中国科学院长春光学精密机械与物理研究所 | Large-target-surface ultra-wide-angle transmission visible lens |
-
2022
- 2022-03-21 CN CN202210277992.7A patent/CN114578528A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115808771A (en) * | 2022-12-30 | 2023-03-17 | 中国科学院长春光学精密机械与物理研究所 | Large-target-surface ultra-wide-angle transmission visible lens |
| CN115808771B (en) * | 2022-12-30 | 2024-04-19 | 中国科学院长春光学精密机械与物理研究所 | Large target surface ultra-wide angle transmission visible light lens |
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