CN115390222A - Two-piece type short-focus optical lens - Google Patents
Two-piece type short-focus optical lens Download PDFInfo
- Publication number
- CN115390222A CN115390222A CN202211055045.XA CN202211055045A CN115390222A CN 115390222 A CN115390222 A CN 115390222A CN 202211055045 A CN202211055045 A CN 202211055045A CN 115390222 A CN115390222 A CN 115390222A
- Authority
- CN
- China
- Prior art keywords
- lens
- focus optical
- piece short
- short
- image
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The invention provides a two-piece short-focus optical lens, which sequentially comprises the following components from an object side to an image side: the lens comprises a first protective glass, a first lens, a diaphragm, a second lens, a second protective glass and a third protective glass; the first lens element and the second lens element have refractive power; it satisfies the following conditions: 3.033 woven-over-fiber TTL (transistor-transistor logic) woven fabric layer 3.103; wherein TTL is the total lens length; 0.752mm-woven EFL-woven fabric (0.810 mm); the EFL is an effective focal length of the two-piece short-focus optical lens; 5.741 once Fno-6.217; wherein, fno is the aperture value of the two-piece short-focus optical lens; 31.305 degrees < HFOV <33.203 degrees; the HFOV is a half field angle of the two-piece short-focus optical lens; the ImgH =0.591; wherein ImgH is image height; 1.357< | R3/R2 | 1.422; wherein R2 is the curvature radius of the image side surface of the first lens, and R3 is the curvature radius of the object side surface of the second lens (12); 0.513-woven fabric CT2/CT3<0.591; wherein, CT2 is the optical axis thickness of the first lens, and CT3 is the optical axis thickness of the second lens. On the basis of ensuring the imaging quality, the total lens is short and the lens volume is small.
Description
Technical Field
The invention relates to the technical field of optical lenses, in particular to a two-piece short-focus optical lens.
Background
With the development of science and technology, the scene shooting device is gradually developed, the photosensitive element of the optical system of the scene shooting device is not only a photosensitive coupling element or a complementary metal oxide semiconductor element, and with the refinement of semiconductor processing technology, the pixel size of the photosensitive element is reduced, and the optical system tends to have higher pixels and higher imaging quality. In order to meet this trend, high image quality, miniaturization, and wider angle are also required for an object photographing device mounted on an image pickup device such as a computer, communication and consumer electronics, and a lens of a mobile phone. In order to achieve an ultra-wide angle, the number of lenses is easily increased, and the miniaturization and the light weight of the lens are not facilitated while the imaging quality is ensured.
Disclosure of Invention
Aiming at the problems, the invention provides a two-piece short-focus optical lens, which has the advantages of short total lens length and small lens volume on the basis of ensuring the imaging quality.
In order to achieve the purpose, the invention is solved by the following technical scheme:
a two-piece short-focus optical lens includes, in order from an object side to an image side:
the lens comprises a first protective glass, a first lens, a diaphragm, a second lens, a second protective glass and a third protective glass;
the first lens element with refractive power has a convex object-side surface at a paraxial region thereof and a concave image-side surface at a paraxial region thereof;
the second lens element with refractive power has a concave object-side surface at a paraxial region thereof and a convex image-side surface at a paraxial region thereof;
it satisfies the following conditions:
3.033 woven-over-fiber TTL (transistor-transistor logic) woven fabric layer 3.103; wherein TTL is the total lens length;
0.752mm-woven EFL-woven fabric (0.810 mm); the EFL is an effective focal length of the two-piece short-focus optical lens;
5.741 once Fno-6.217; wherein, fno is the aperture value of the two-piece short-focus optical lens;
31.305 degrees < HFOV <33.203 degrees; the HFOV is a half field angle of the two-piece short-focus optical lens;
the ImgH =0.591; wherein ImgH is image height;
1.357< | R3/R2 | 1.422; wherein R2 is the curvature radius of the image side surface of the first lens, and R3 is the curvature radius of the object side surface of the second lens (12);
0.513-woven fabric CT2/CT3<0.591; wherein, CT2 is the optical axis thickness of the first lens, and CT3 is the optical axis thickness of the second lens.
Further, the first lens (11) is a plastic lens.
Further, the second lens (12) is a plastic lens.
The beneficial effects of the invention are: the two lenses are adopted to cooperate for imaging structurally, the number of the lenses is small, the production cost is reduced, the total lens length is between 3.033 and 3.103, the half field angle is between 31.305 and 33.203 degrees, and the effects of short total lens length, small lens size and light weight are achieved on the basis of ensuring the imaging quality.
Drawings
Fig. 1 is a schematic structural diagram of a three-piece short-focus optical lens according to embodiment 1.
Fig. 2 is a field curvature aberration diagram of the three-piece short-focus optical lens of embodiment 1.
Fig. 3 is a distortion aberration diagram of the three-piece short-focus optical lens of example 1.
Fig. 4 is a longitudinal spherical aberration diagram of the three-piece short-focus optical lens of embodiment 1.
Fig. 5 is a schematic structural diagram of a three-piece short-focus optical lens according to embodiment 2.
Fig. 6 is a field curvature aberration diagram of the three-piece short-focus optical lens of embodiment 2.
Fig. 7 is a distortion aberration diagram of the three-piece type short-focus optical lens of embodiment 2.
Fig. 8 is a longitudinal spherical aberration diagram of the three-piece short-focus optical lens according to embodiment 2.
Fig. 9 is a schematic structural diagram of a three-lens short-focus optical lens according to embodiment 3.
Fig. 10 is a field curvature aberration diagram of the three-piece short-focus optical lens according to embodiment 3.
Fig. 11 is a distortion aberration diagram of the three-piece type short-focus optical lens of embodiment 3.
Fig. 12 is a longitudinal spherical aberration diagram of the three-piece short-focus optical lens according to embodiment 3.
The reference signs are: the lens comprises a first protective glass 10, a first lens 11, a diaphragm 15, a second lens 12, a second protective glass 13 and a third protective glass 14.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the embodiments of the present invention are not limited thereto.
Example 1
As shown in fig. 1 to 4, a two-piece short-focus optical lens includes, in order from an object side to an image side:
a first protective glass 10, a first lens 11, a diaphragm 15, a second lens 12, a second protective glass 13, and a third protective glass 14;
the first lens element 11 with refractive power has a convex object-side surface at the paraxial region of the first lens element 11 and a concave image-side surface at the paraxial region of the first lens element 11; the first lens 11 is a plastic lens.
The second lens element 12 with refractive power has a concave object-side surface at the paraxial region of the second lens element 12 and a convex image-side surface at the paraxial region of the second lens element 12; the second lens 12 is provided as a plastic lens.
It satisfies the following conditions:
3.033 woven-over-fiber TTL (transistor-transistor logic) woven fabric layer 3.103; where TTL is the total lens length, and in the present embodiment, TTL =3.103.
0.752mm-woven EFL-woven fabric (0.810 mm); the EFL is the effective focal length of the two-piece short-focus optical lens; in the present embodiment, EFL =0.799mm.
5.741 once Fno-6.217; wherein, fno is the aperture value of the two-piece short-focus optical lens; in the present embodiment, fno =6.217.
31.305 degrees < HFOV <33.203 degrees; the HFOV is a half field angle of the two-piece short-focus optical lens; in the present embodiment, HFOV =31.305 degrees.
ImgH =0.591; wherein ImgH is image height;
1.357< | R3/R2 | 1.422; wherein, R2 is a curvature radius of the image-side surface of the first lens element 11, and R3 is a curvature radius of the object-side surface of the second lens element 12; in this embodiment, | R3/R2 | =1.357.
0.513-woven fabric CT2/CT3<0.591; where CT2 is the optical axis thickness of the first lens 11, and CT3 is the optical axis thickness of the second lens 12. In the present embodiment, CT2/CT3=0.591.
Please refer to table 1 below, which shows detailed optical data of example 1 of the present invention. The object-side surface of the first lens element 11 is indicated as surface L1a, the image-side surface is indicated as surface L1b, and so on, and the following description is not repeated.
TABLE 1
Please refer to table 2, which shows the aspheric coefficients of the lens surfaces of example 1.
TABLE 2
Example 2
As shown in fig. 5 to 8, a two-lens short-focus optical lens includes, in order from an object side to an image side:
a first protective glass 10, a first lens 11, a diaphragm 15, a second lens 12, a second protective glass 13, and a third protective glass 14;
the first lens element 11 with refractive power has a convex object-side surface at a paraxial region of the first lens element 11, and a concave image-side surface at a paraxial region of the first lens element 11; the first lens 11 is a plastic lens.
The second lens element 12 with refractive power has a concave object-side surface at the paraxial region of the second lens element 12 and a convex image-side surface at the paraxial region of the second lens element 12; the second lens 12 is provided as a plastic lens.
It satisfies the following conditions:
3.033 and ttl are all over 3.103; wherein TTL is the total lens length, and in the present embodiment, TTL =3.073
0.752mm-woven EFL-woven fabric (0.810 mm); wherein, EFL is the effective focal length of the two-piece short-focus optical lens; in the present embodiment, EFL =0.810mm.
5.741 once Fno-6.217; wherein, fno is the aperture value of the two-piece short-focus optical lens; in the present embodiment, fno =6.135.
31.305 degrees < HFOV <33.203 degrees; the HFOV is a half field angle of the two-piece short-focus optical lens; in the present embodiment, HFOV =32.377 degrees.
ImgH =0.591; wherein ImgH is image height;
1.357< | R3/R2 | 1.422; wherein, R2 is a curvature radius of the image-side surface of the first lens element 11, and R3 is a curvature radius of the object-side surface of the second lens element 12; in this embodiment, | R3/R2 | =1.422.
0.513< -CT2/CT 3<0.591; where CT2 is the optical axis thickness of the first lens 11, and CT3 is the optical axis thickness of the second lens 12. In the present embodiment, CT2/CT3=0.513.
Please refer to table 1 below, which shows detailed optical data of example 2 of the present invention. The object-side surface of the first lens element 11 is denoted as surface L1a, the image-side surface is denoted as surface L1b, and so on, and the description thereof will not be repeated below.
TABLE 3
Please refer to table 4, which shows the aspheric coefficients of the lens surfaces of example 2 of the present invention.
TABLE 4
Example 3
As shown in fig. 9 to 12, a two-piece short-focus optical lens includes, in order from an object side to an image side:
a first protective glass 10, a first lens 11, a diaphragm 15, a second lens 12, a second protective glass 13, and a third protective glass 14;
the first lens element 11 with refractive power has a convex object-side surface at the paraxial region of the first lens element 11 and a concave image-side surface at the paraxial region of the first lens element 11; the first lens 11 is a plastic lens.
The second lens element 12 with refractive power has a concave object-side surface at the paraxial region of the second lens element 12 and a convex image-side surface at the paraxial region of the second lens element 12; the second lens 12 is provided as a plastic lens.
It satisfies the following conditions:
3.033 and ttl are all over 3.103; wherein, TTL is the total mirror length, and in the present embodiment, TTL =3.033.
0.752mm-woven EFL-woven fabric (0.810 mm); the EFL is the effective focal length of the two-piece short-focus optical lens; in the present embodiment, EFL =0.752mm.
5.741 yarn-over-fiber (Fno) yarn-over-fiber (6.217); wherein, fno is the aperture value of the two-piece short-focus optical lens; in the present embodiment, fno =5.741.
31.305 degrees < HFOV <33.203 degrees; the HFOV is a half field angle of the two-piece short-focus optical lens; in the present embodiment, HFOV =33.203 degrees.
ImgH =0.591; wherein ImgH is image height;
1.357< | R3/R2 | 1.422; wherein, R2 is a curvature radius of the image-side surface of the first lens element 11, and R3 is a curvature radius of the object-side surface of the second lens element 12; in this embodiment, | R3/R2 | =1.396.
0.513-woven fabric CT2/CT3<0.591; where CT2 is the optical axis thickness of the first lens 11, and CT3 is the optical axis thickness of the second lens 12. In the present embodiment, CT2/CT3=0.522.
Please refer to table 1 below, which shows detailed optical data of the short-focus optical lens of embodiment 3 of the present invention. The object-side surface of the first lens element 11 is denoted as surface L1a, the image-side surface is denoted as surface L1b, and so on, and the description thereof will not be repeated below.
TABLE 5
Please refer to table 6, which shows aspheric coefficients of the lens surfaces of embodiment 3 of the present invention.
TABLE 6
The curve equation of the aspherical surface of each lens described above is expressed as follows:
wherein, X: the distance between a point on the aspheric surface, which is Y away from the optical axis, and a tangent plane of the aspheric surface and the optical axis;
y: the vertical distance between a point on the aspheric surface and the optical axis;
r: a radius of curvature of the lens at the paraxial region;
k: a cone coefficient;
A i : the ith order aspheric coefficients.
By integrating the above embodiments, the invention structurally adopts two lenses for imaging in a matching way, the number of the lenses is small, the production cost is reduced, the total lens length is between 3.033 and 3.103, and the half field angle is between 31.305 and 33.203 degrees, so that the effects of short total lens length, small lens volume and light weight are realized on the basis of ensuring the imaging quality.
The above examples only show 3 embodiments of the present invention, and the description thereof is specific and detailed, but not to be 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 (3)
1. A two-lens short-focus optical lens, comprising, in order from an object side to an image side:
a first protective glass (10), a first lens (11), a diaphragm (15), a second lens (12), a second protective glass (13), and a third protective glass (14);
the first lens element (11) with refractive power has a convex object-side surface at a paraxial region of the first lens element (11), and a concave image-side surface at a paraxial region of the first lens element (11);
the second lens element (12) with refractive power has a concave surface on an object-side paraxial region of the second lens element (12), and a convex surface on an image-side paraxial region of the second lens element (12);
it satisfies the following conditions:
3.033 woven-over-fiber TTL (transistor-transistor logic) woven fabric layer 3.103; wherein TTL is the total lens length;
0.752mm is covered with EFL 0.810mm; the EFL is an effective focal length of the two-piece short-focus optical lens;
5.741 yarn-over-fiber (Fno) yarn-over-fiber (6.217); wherein, fno is the aperture value of the two-piece short-focus optical lens;
31.305 degrees < HFOV <33.203 degrees; the HFOV is a half field angle of the two-piece short-focus optical lens;
the ImgH =0.591; wherein ImgH is image height;
1.357< | R3/R2 | 1.422; wherein R2 is the curvature radius of the image side surface of the first lens (11), and R3 is the curvature radius of the object side surface of the second lens (12);
0.513-woven fabric CT2/CT3<0.591; wherein, CT2 is the optical axis thickness of the first lens (11), and CT3 is the optical axis thickness of the second lens (12).
2. A two-piece short focal length optical lens as claimed in claim 1, characterized in that the first lens (11) is configured as a plastic lens.
3. A two-piece short focal length optical lens as claimed in claim 2, characterized in that the second lens (12) is configured as a plastic lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211055045.XA CN115390222B (en) | 2022-08-31 | 2022-08-31 | Two-piece type short-focus optical lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211055045.XA CN115390222B (en) | 2022-08-31 | 2022-08-31 | Two-piece type short-focus optical lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115390222A true CN115390222A (en) | 2022-11-25 |
| CN115390222B CN115390222B (en) | 2024-06-07 |
Family
ID=84123924
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211055045.XA Active CN115390222B (en) | 2022-08-31 | 2022-08-31 | Two-piece type short-focus optical lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115390222B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020015238A1 (en) * | 2000-07-06 | 2002-02-07 | Fuji Photo Film Co., Ltd. | Taking lens |
| US20040036983A1 (en) * | 2002-05-10 | 2004-02-26 | Noboru Ninomiya | Image pick-up lens |
| JP3150961U (en) * | 2008-10-03 | 2009-06-04 | 一品光学工業股▲ふん▼有限公司 | Compact short back focus 2 lens optical imaging lens system |
| JP2016126120A (en) * | 2014-12-26 | 2016-07-11 | 株式会社ニコン | Ocular lens, optical device, and method for manufacturing ocular lens |
| US20170082831A1 (en) * | 2015-09-18 | 2017-03-23 | AAC Technologies Pte. Ltd. | Lens assembly for biologic characteristic identification |
| US20200005567A1 (en) * | 2018-06-29 | 2020-01-02 | Gingy Technology Inc. | Image capturing apparatus |
| US20200049949A1 (en) * | 2018-08-07 | 2020-02-13 | Newmax Technology Co., Ltd. | Compact optical lens system |
| CN214474191U (en) * | 2021-03-11 | 2021-10-22 | 江西欧迈斯微电子有限公司 | Optical imaging lens, camera module and electronic equipment |
-
2022
- 2022-08-31 CN CN202211055045.XA patent/CN115390222B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020015238A1 (en) * | 2000-07-06 | 2002-02-07 | Fuji Photo Film Co., Ltd. | Taking lens |
| US20040036983A1 (en) * | 2002-05-10 | 2004-02-26 | Noboru Ninomiya | Image pick-up lens |
| JP3150961U (en) * | 2008-10-03 | 2009-06-04 | 一品光学工業股▲ふん▼有限公司 | Compact short back focus 2 lens optical imaging lens system |
| JP2016126120A (en) * | 2014-12-26 | 2016-07-11 | 株式会社ニコン | Ocular lens, optical device, and method for manufacturing ocular lens |
| US20170082831A1 (en) * | 2015-09-18 | 2017-03-23 | AAC Technologies Pte. Ltd. | Lens assembly for biologic characteristic identification |
| US20200005567A1 (en) * | 2018-06-29 | 2020-01-02 | Gingy Technology Inc. | Image capturing apparatus |
| US20200049949A1 (en) * | 2018-08-07 | 2020-02-13 | Newmax Technology Co., Ltd. | Compact optical lens system |
| CN214474191U (en) * | 2021-03-11 | 2021-10-22 | 江西欧迈斯微电子有限公司 | Optical imaging lens, camera module and electronic equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115390222B (en) | 2024-06-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104516093B (en) | Optical imaging lens system, image capturing device and mobile terminal | |
| CN105652412B (en) | Image system lens group | |
| CN103926676A (en) | Optical Image Capturing Lens Assembly | |
| CN210775999U (en) | Optical system, lens module and electronic equipment | |
| CN108957693B (en) | Image pickup optical lens | |
| CN110398819B (en) | Image pickup optical lens | |
| CN110967805B (en) | Optical camera lens assembly, image capturing module and electronic device | |
| WO2021189431A1 (en) | Optical system, camera module, and electronic device | |
| CN111123485A (en) | Camera optics | |
| CN111239988A (en) | Optical systems, lens modules and electronics | |
| CN110221411B (en) | Camera optics | |
| CN107918190B (en) | Image pickup optical lens | |
| CN112034593B (en) | Optical imaging system, imaging module and electronic device | |
| CN211786323U (en) | Optical system, lens module and electronic equipment | |
| CN111239986B (en) | Optical systems, lens modules and electronic equipment | |
| CN113156612A (en) | Optical system, image capturing module and electronic equipment | |
| CN111929872A (en) | Image pickup optical lens | |
| CN114967074B (en) | Short-focus optical lens | |
| CN115268033B (en) | Six-piece type short-focus optical lens | |
| CN114967073B (en) | Short-focus telescopic optical lens | |
| CN114815174B (en) | Optical lens for long-distance shooting | |
| CN114779449B (en) | Wide-angle lens for close-range shooting | |
| CN114779432B (en) | Wide-angle optical lens | |
| CN114488486B (en) | Optical imaging system | |
| CN112444940A (en) | Optical system, lens module and electronic equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant |