CN112285881A - Two-lens small-diameter large-field-angle lens - Google Patents
Two-lens small-diameter large-field-angle lens Download PDFInfo
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- CN112285881A CN112285881A CN202010747002.2A CN202010747002A CN112285881A CN 112285881 A CN112285881 A CN 112285881A CN 202010747002 A CN202010747002 A CN 202010747002A CN 112285881 A CN112285881 A CN 112285881A
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- 230000003287 optical effect Effects 0.000 claims abstract description 15
- 238000009434 installation Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 13
- 238000003384 imaging method Methods 0.000 description 9
- 230000004075 alteration Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 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
- G02B13/001—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
- G02B13/003—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 two 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
- G02B13/0015—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
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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Abstract
The invention discloses a two-lens small-diameter large-field-angle lens which is characterized in that from an object space to an image space along an optical axis, the two-lens small-diameter large-field-angle lens is sequentially provided with: a first lens L1, an aperture Stop, and a second lens L2; wherein the first lens L1 is a negative lens having a first surface and a second surface whose central position is concave to the image side; the second lens L2 is a positive lens having a third surface and a fourth surface convex to the image side; the aperture Stop is located between the first lens L1 and the second lens L2, and is used for balancing the outer diameter of the two lenses. The invention adopts two lenses, can shoot in narrow space, meets the size requirement of small outer diameter of the lens and the function of large field angle, and can be used in the field of narrow shooting space or narrow installation space of the lens.
Description
Technical Field
The invention relates to the technical field of lenses, in particular to a two-lens small-diameter large-field-angle lens.
Background
In some application fields (such as medical science, industry, environmental protection, scientific research, search, exploration and other various fields), a small shooting space or a small installation space of the lens not only needs the outer diameter of the lens to be small, but also needs to satisfy the function of a large field angle.
Therefore, how to provide a two-lens small-diameter large-field-angle lens that can satisfy the above requirements is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention provides a two-lens small-diameter large-field-angle lens, which can not only capture images in a narrow space, but also satisfy the requirements of small outer diameter and large field angle.
In order to achieve the purpose, the invention provides the following technical scheme:
the lens with two lenses, small diameter and large field angle is characterized in that the lens is sequentially provided with the following components from an object side to an image side along an optical axis: a first lens (L1), an aperture Stop (Stop), and a second lens (L2); wherein the first lens (L1) is a negative lens having a first surface and a second surface whose central position is concave to the image side; the second lens (L2) is a positive lens having a third surface and a fourth surface convex to the image side; the aperture Stop (Stop) is positioned between the first lens (L1) and the second lens (L2) and is used for balancing the outer diameter of the two lenses.
Preferably, in the above two-lens small-diameter large-field-angle lens, the surfaces of the first lens (L1) and the second lens (L2) are spherical or aspherical.
Preferably, in the two-lens small-diameter large-angle lens described above, an optical filter (IR) is provided on the image side of the second lens (L2).
Preferably, in the above two-lens small-diameter large-field-angle lens, the lens satisfies the following conditions: 0.1< (Tfs/f)/tan (hfov) < 0.5; wherein, Tfs is: the distance from the center of the object space surface of the first lens (L1) to the aperture Stop (Stop); f is the effective focal length of the lens; the HFOV is half of the maximum field angle.
Preferably, in the above two-lens small-diameter large-field-angle lens, the lens satisfies the following conditions: 1< f/f2< 2; wherein f is the effective focal length of the lens; f2 is the focal length of the second lens.
Preferably, in the above two-lens small-diameter large-field-angle lens, the lens satisfies the following conditions: 0.1< [ Ho/tan (HFOV) ]/f < 0.5; the Ho is the height of the light at the edge of the object space surface of the first lens when the maximum field angle is achieved; HFOV is half of the maximum field angle; f is the effective focal length of the lens.
According to the technical scheme, compared with the prior art, the invention has the following characteristics:
a first lens (L1) which is a negative lens and is beneficial to realizing a large field angle;
the aperture diaphragm (Stop) is positioned between the two lenses, and the outer diameters of the two lenses are balanced, so that the requirement of small outer diameter of the lens is favorably met;
the second lens (L2) is a positive lens, and the focal power required by the lens for imaging is mainly provided by the second lens;
the invention adopts two lenses, can shoot in narrow space, meets the size requirement of small outer diameter of the lens and the function of large field angle, and can be used in the field of narrow shooting space or narrow installation space of the lens.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of the present invention.
Fig. 2 is a schematic structural diagram of embodiment 1 of the present invention.
FIG. 3 is a light ray fan diagram of embodiment 1 of the present invention.
FIG. 4 is a graph showing curvature of field and distortion in example 1 of the present invention.
Fig. 5 is a graph showing MTF resolution in embodiment 1 of the present invention.
Fig. 6 is a schematic structural diagram of embodiment 2 of the present invention.
FIG. 7 is a light ray fan diagram according to example 2 of the present invention.
Fig. 8 is a graph showing curvature of field and distortion in example 2 of the present invention.
Fig. 9 is a graph showing MTF resolution in embodiment 2 of the present invention.
Fig. 10 is a schematic structural diagram of embodiment 3 of the present invention.
FIG. 11 is a light ray fan diagram of embodiment 3 of the present invention.
FIG. 12 is a graph showing curvature of field and distortion in example 3 of the present invention.
FIG. 13 is a graph showing MTF resolution in embodiment 3 of the present invention
FIG. 14 is a schematic structural diagram of embodiment 4 of the present invention.
Figure 15 is a ray fan diagram of embodiment 4 of the present invention.
FIG. 16 is a graph showing curvature of field and distortion in example 4 of the present invention.
FIG. 17 is a graph showing MTF resolution in embodiment 4 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1: fig. 2 is a schematic view of an optical lens according to a first embodiment of the invention. As shown in fig. 2 to 5, the first lens L1, the aperture Stop, the second lens L2, the optical filter (IR), and the Image plane Image are disposed in this order from the object side to the Image side along the optical axis according to the first embodiment of the present invention; a first lens L1 having a first surface S1 and a second surface S2 whose central position is concave to the image side; the aperture Stop has a surface S3; a second lens L2 having a third surface S4 and a fourth surface S5 convex to the image side; the filter IR has a first surface S6 facing the object side and a second surface S7 facing the image side; the Image plane Image has a surface S8.
Lens data of the above-described lens are shown in tables 1 and 2 below.
[ TABLE 1 ]
[ TABLE 2 ]
The conditions satisfied by the above-described lens are shown in table 3.
[ TABLE 3 ]
| Marking | Content of the presentation | Numerical value |
| f | Effective focal length of lens | 1.469 |
| HFOV | Half of maximum field angle | 70 |
| f1 | Focal length of the first lens (L1) | -1.638 |
| f2 | Focal point of the second lens (L2)Distance between | 1.17 |
| Ho | The first lens (L1) object side surface edge ray height at maximum field angle. | 0.782 |
| Tfs | The distance from the center of the object space surface of the first lens (L1) to the aperture Stop (Stop) | 0.907 |
| 2、 | 0.1<(Tfs/f)/tan(HFOV)<0.5 | 0.225 |
| 3、 | 1<f/f2<2 | 1.256 |
| 4、 | 0.1<[Ho/tan(HFOV)]/f<0.5 | 0.194 |
In the above embodiment:
as shown in fig. 3 (light sector), it can be seen that the spherical aberration of the lower order has been corrected well and the spherical aberration of the higher order is smaller.
As shown in fig. 4 (field curvature and distortion diagram), the distortion curve is relatively smooth, which effectively improves the definition of the expanded image.
As shown in fig. 5 (MTF resolution graph), it can be seen from the curves that MTF curves of the meridian and the sagittal of each field of view are relatively close, which indicates that the lens has relatively good imaging consistency in both directions of the meridian (T) and the sagittal (S), and the lens has relatively good imaging effect and resolution.
Example 2:
fig. 5 is a schematic view of an optical lens according to a second embodiment of the present invention. As shown in fig. 6 to 9, the first lens L1, the aperture Stop, the second lens L2, the optical filter (IR), and the Image plane Image are disposed in this order from the object side to the Image side along the optical axis according to the second embodiment of the present invention; a first lens L1 having a first surface S1 and a second surface S2 whose central position is concave to the image side; the aperture Stop has a surface S3; a second lens L2 having a third surface S4 and a fourth surface S5 convex to the image side; the filter IR has a first surface S6 facing the object side and a second surface S7 facing the image side; the Image plane Image has a surface S8.
Lens data of the above lenses are shown in table 4 below.
[ TABLE 4 ]
The conditions satisfied by the above-described lens are shown in table 5.
[ TABLE 5 ]
| Marking | Content of the presentation | Numerical value |
| f | Effective focal length of lens | 1.008 |
| HFOV | Half of |
60 |
| f1 | Focal length of the first lens (L1) | -2.27 |
| f2 | Focal length of the second lens (L2) | 0.806 |
| Ho | The first lens (L1) object side surface edge ray height at maximum field angle. | 0.392 |
| Tfs | The distance from the center of the object space surface of the first lens (L1) to the aperture Stop (Stop) | 0.365 |
| 2、 | 0.1<(Tfs/f)/tan(HFOV)<0.5 | 0.209 |
| 3、 | 1<f/f2<2 | 1.251 |
| 4、 | 0.1<[Ho/tan(HFOV)]/f<0.5 | 0.225 |
In the above embodiment:
as shown in fig. 7 (light sector), it can be seen that the spherical aberration of the lower order has been corrected well and the spherical aberration of the higher order is smaller.
As shown in fig. 8 (field curvature and distortion diagram), the distortion curve is relatively smooth, which effectively improves the definition of the expanded image.
As shown in fig. 9 (MTF resolution graph), it can be seen from the curves that MTF curves of the meridian and the sagittal of each field of view are relatively close, which indicates that the lens has relatively good imaging consistency in both directions of the meridian (T) and the sagittal (S), and the lens has relatively good imaging effect and resolution.
Example 3:
fig. 10 is a schematic view of an optical lens according to a third embodiment of the present invention. As shown in fig. 10 to 13, the first lens L1, the aperture Stop, the second lens L2, the filter IR, and the Image plane Image are disposed in this order from the object side to the Image side along the optical axis according to the third embodiment of the present invention; a first lens L1 having a first surface S1 and a second surface S2 whose central position is concave to the image side; the aperture Stop has a surface S3; a second lens L2 having a third surface S4 and a fourth surface S5 convex to the image side; the filter IR has a first surface S6 facing the object side and a second surface S7 facing the image side; the Image plane Image has a surface S8.
Lens data of the above lenses are shown in table 6 below.
[ TABLE 6 ]
The conditions satisfied by the above-described lens are shown in table 7.
[ TABLE 7 ]
| Marking | Content of the presentation | Numerical value |
| f | Effective focal length of lens | 1.037 |
| HFOV | Half of |
60 |
| f1 | Focal length of the first lens (L1) | -2.093 |
| f2 | Focal length of the second lens (L2) | 0.825 |
| Ho | The first lens (L1) object side surface edge ray height at maximum field angle. | 0.365 |
| Tfs | A first lens (L1) object spaceDistance from surface center to aperture Stop (Stop) | 0.359 |
| 2、 | 0.1<(Tfs/f)/tan(HFOV)<0.5 | 0.200 |
| 3、 | 1<f/f2<2 | 1.257 |
| 4、 | 0.1<[Ho/tan(HFOV)]/f<0.5 | 0.203 |
In the above embodiment:
as shown in fig. 11 (light sector), it can be seen that the spherical aberration of the lower order has been corrected well and the spherical aberration of the higher order is smaller.
As shown in fig. 12 (field curvature and distortion diagram), the distortion curve is relatively smooth, and the definition of the expanded image is effectively improved.
As shown in fig. 13 (MTF resolution graph), it can be seen from the curves that MTF curves of the meridian and the sagittal of each field of view are relatively close, which indicates that the lens has relatively good imaging consistency in both directions of the meridian (T) and the sagittal (S), and the lens has relatively good imaging effect and resolution.
Example 4:
fig. 14 is a schematic view of an optical lens according to a fourth embodiment of the invention. As shown in fig. 14 to 17, the first lens L1, the aperture Stop, the second lens L2, the filter IR, and the Image plane Image are disposed in this order from the object side to the Image side along the optical axis according to the fourth embodiment of the present invention; a first lens L1 having a surface S1 and a second surface S2 whose central position is concave to the image side; the aperture Stop has a surface S3; a second lens L2 having a third surface S4 and a fourth surface S5 convex to the image side; the filter IR has a first surface S6 facing the object side and a second surface S7 facing the image side; the Image plane Image has a surface S8.
Lens data of the above lenses are shown in table 8 below.
[ TABLE 8 ]
The conditions satisfied by the above-described lens are shown in table 9.
[ TABLE 9 ]
| Marking | Content of the presentation | Numerical value |
| f | Effective focal length of lens | 1.038 |
| HFOV | Half of |
60 |
| f1 | First pass throughFocal length of mirror (L1) | -1.994 |
| f2 | Focal length of the second lens (L2) | 0.813 |
| Ho | The first lens (L1) object side surface edge ray height at maximum field angle. | 0.365 |
| Tfs | The distance from the center of the object space surface of the first lens (L1) to the aperture Stop (Stop) | 0.356 |
| 2、 | 0.1<(Tfs/f)/tan(HFOV)<0.5 | 0.198 |
| 3、 | 1<f/f2<2 | 1.277 |
| 4、 | 0.1<[Ho/tan(HFOV)]/f<0.5 | 0.203 |
In the above embodiment:
as shown in fig. 15 (light sector), it can be seen that the spherical aberration of the lower order has been corrected well and the spherical aberration of the higher order is smaller.
As shown in fig. 16 (field curvature and distortion diagram), the distortion curve is relatively smooth, and the definition of the expanded image is effectively improved.
As shown in fig. 17 (MTF resolution graph), it can be seen from the curves that MTF curves of the meridian and the sagittal of each field of view are relatively close, which indicates that the lens has relatively good imaging consistency in both directions of the meridian (T) and the sagittal (S), and the lens has relatively good imaging effect and resolution.
As described above, the two-lens small-diameter large-field-angle lens according to the present invention satisfies both the size requirement for a small outer diameter of the lens and the function of a large field angle, and has a simple structure, and can perform photographing in a narrow space.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. The lens with two lenses, small diameter and large field angle is characterized in that the lens is sequentially provided with the following components from an object side to an image side along an optical axis: a first lens (L1), an aperture Stop (Stop), and a second lens (L2); wherein the first lens (L1) is a negative lens having a first surface and a second surface whose central position is concave to the image side; the second lens (L2) is a positive lens having a third surface and a fourth surface convex to the image side; the aperture Stop (Stop) is positioned between the first lens (L1) and the second lens (L2) and is used for balancing the outer diameter of the two lenses.
2. The lens barrel with small diameter and large field angle as claimed in claim 1, wherein the surfaces of the first lens (L1) and the second lens (L2) are spherical or aspherical.
3. The lens barrel with small diameter and large field angle as claimed in claim 1, wherein the second lens (L2) has an image side provided with an optical filter (IR).
4. A two-lens small-diameter large-field-angle lens according to claim 1, wherein the following conditions are satisfied: 0.1< (Tfs/f)/tan (hfov) < 0.5; wherein, Tfs is: the distance from the center of the object space surface of the first lens (L1) to the aperture Stop (Stop); f is the effective focal length of the lens; the HFOV is half of the maximum field angle.
5. A two-lens small-diameter large-field-angle lens according to claim 4, wherein the following conditions are satisfied: 1< f/f2< 2; wherein f is the effective focal length of the lens; f2 is the focal length of the second lens (L2).
6. A two-lens small-diameter large-field-angle lens according to claim 5, wherein the following conditions are satisfied: 0.1< [ Ho/tan (HFOV) ]/f < 0.5; wherein, Ho is the light ray height of the edge of the object space surface of the first lens (L1) at the maximum field angle; HFOV is half of the maximum field angle; f is the effective focal length of the lens.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010747002.2A CN112285881A (en) | 2020-07-29 | 2020-07-29 | Two-lens small-diameter large-field-angle lens |
| PCT/CN2021/099857 WO2022022116A1 (en) | 2020-07-29 | 2021-06-11 | Two-lens piece small-diameter lens having large field of view |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010747002.2A CN112285881A (en) | 2020-07-29 | 2020-07-29 | Two-lens small-diameter large-field-angle lens |
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| CN112285881A true CN112285881A (en) | 2021-01-29 |
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| CN202010747002.2A Pending CN112285881A (en) | 2020-07-29 | 2020-07-29 | Two-lens small-diameter large-field-angle lens |
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| WO (1) | WO2022022116A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022022116A1 (en) * | 2020-07-29 | 2022-02-03 | 湖北华鑫光电有限公司 | Two-lens piece small-diameter lens having large field of view |
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| JP2006330575A (en) * | 2005-05-30 | 2006-12-07 | Konica Minolta Opto Inc | Imaging lens |
| CN102067005A (en) * | 2008-06-16 | 2011-05-18 | 松下电器产业株式会社 | Double image pickup optical system and image pickup apparatus provided therewith |
| JP2014002252A (en) * | 2012-06-18 | 2014-01-09 | Kyocera Corp | Imaging optical system and imaging device |
| US20170068087A1 (en) * | 2015-09-04 | 2017-03-09 | Olympus Corporation | Image forming optical system, image pickup apparatus, optical apparatus, and capsule endoscope |
| CN106842518A (en) * | 2017-03-03 | 2017-06-13 | 东莞市宇光光电科技有限公司 | Inside peep and use imaging lens optical system |
| CN107065148A (en) * | 2017-03-31 | 2017-08-18 | 广东旭业光电科技股份有限公司 | A kind of optical lens and imaging device |
| CN109196519A (en) * | 2018-08-21 | 2019-01-11 | 深圳市汇顶科技股份有限公司 | Lens system, fingerprint identification device and terminal device |
| CN212623307U (en) * | 2020-07-29 | 2021-02-26 | 湖北华鑫光电有限公司 | Two-lens small-diameter large-field-angle lens |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112285881A (en) * | 2020-07-29 | 2021-01-29 | 湖北华鑫光电有限公司 | Two-lens small-diameter large-field-angle lens |
-
2020
- 2020-07-29 CN CN202010747002.2A patent/CN112285881A/en active Pending
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2021
- 2021-06-11 WO PCT/CN2021/099857 patent/WO2022022116A1/en active Application Filing
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006330575A (en) * | 2005-05-30 | 2006-12-07 | Konica Minolta Opto Inc | Imaging lens |
| CN102067005A (en) * | 2008-06-16 | 2011-05-18 | 松下电器产业株式会社 | Double image pickup optical system and image pickup apparatus provided therewith |
| JP2014002252A (en) * | 2012-06-18 | 2014-01-09 | Kyocera Corp | Imaging optical system and imaging device |
| US20170068087A1 (en) * | 2015-09-04 | 2017-03-09 | Olympus Corporation | Image forming optical system, image pickup apparatus, optical apparatus, and capsule endoscope |
| CN106842518A (en) * | 2017-03-03 | 2017-06-13 | 东莞市宇光光电科技有限公司 | Inside peep and use imaging lens optical system |
| CN107065148A (en) * | 2017-03-31 | 2017-08-18 | 广东旭业光电科技股份有限公司 | A kind of optical lens and imaging device |
| CN109196519A (en) * | 2018-08-21 | 2019-01-11 | 深圳市汇顶科技股份有限公司 | Lens system, fingerprint identification device and terminal device |
| CN212623307U (en) * | 2020-07-29 | 2021-02-26 | 湖北华鑫光电有限公司 | Two-lens small-diameter large-field-angle lens |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022022116A1 (en) * | 2020-07-29 | 2022-02-03 | 湖北华鑫光电有限公司 | Two-lens piece small-diameter lens having large field of view |
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| WO2022022116A1 (en) | 2022-02-03 |
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