CN115453715B - Three-piece type short-focus optical lens - Google Patents
Three-piece type short-focus optical lens Download PDFInfo
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- CN115453715B CN115453715B CN202211055061.9A CN202211055061A CN115453715B CN 115453715 B CN115453715 B CN 115453715B CN 202211055061 A CN202211055061 A CN 202211055061A CN 115453715 B CN115453715 B CN 115453715B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 66
- 239000011521 glass Substances 0.000 claims abstract description 21
- 230000001681 protective effect Effects 0.000 claims abstract description 21
- 238000003384 imaging method Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 12
- 230000004075 alteration Effects 0.000 description 9
- 239000006185 dispersion Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
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
- G02B13/001—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
- G02B13/0035—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 three lenses
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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 provides a three-piece type short-focus optical lens, which sequentially comprises a first protective glass, a first lens, an aperture, a second lens, a third lens, a second protective glass and a third protective glass from an object side to an image side; the first lens, the second lens and the third lens have refractive power; the short-focus optical lens satisfies the following conditions: 4.058mm is less than or equal to TTL is less than or equal to 4.233mm; wherein TTL is total mirror length; EFL is more than or equal to 0.835mm and less than or equal to 0.880mm; wherein EFL is the effective focal length of the three-piece type short-focus optical lens; fno is more than or equal to 3.010 and less than or equal to 3.048; wherein FNO is the aperture value of the three-piece type short-focus optical lens; 21.495 degrees or less HFOV or less 21.721 degrees; wherein, HFOV is half angle of view of a three-piece short focal optical lens; imgh=0.338 mm; wherein ImgH is image height; the |f| max is more than or equal to 1.83 and less than or equal to 1.85; wherein |f|max is the largest absolute value of focal length among the first lens to the third lens; the |f| min is more than or equal to 0.507 and less than or equal to 0.510; wherein |f|min is the smallest absolute value of the focal length of the first lens element to the third lens element. On the basis of ensuring imaging quality, the total lens is short and the size of the lens is small.
Description
Technical Field
The invention relates to the technical field of optical lenses, in particular to a three-piece type short-focus optical lens.
Background
Wide angle lenses are also known as short focal lenses. With the development of technology, the scene shooting device is gradually raised, the optical system photosensitive element of the scene shooting device is not limited to 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 be higher in pixel and higher in imaging quality. In order to meet this trend, a high image quality, a small size, and a wide angle are further demanded for a subject photographing device mounted on an image pickup device such as a computer, a communication, a consumer electronics, a mobile phone, or the like. In order to achieve ultra-wide angle, the number of lens sheets tends to increase, and the miniaturization and weight reduction of the lens are not facilitated while the imaging quality is ensured.
Disclosure of Invention
Aiming at the problems, the invention provides the three-piece type short-focus optical lens, which has the advantages of short total lens and small lens volume on the basis of ensuring imaging quality.
In order to achieve the above purpose, the present invention solves the problems by the following technical scheme:
the three-piece type short-focus optical lens sequentially comprises a first protective glass, a first lens, an aperture, a second lens, a third lens, a second protective glass and a third protective glass from an object side to an image side;
The first lens element with negative refractive power has a concave object-side surface at a paraxial region thereof and a concave image-side surface at a paraxial region thereof;
the second lens element with positive refractive power has a convex object-side surface and a convex image-side surface;
The third lens element with negative refractive power has a concave object-side surface at a paraxial region thereof and a concave image-side surface at a paraxial region thereof;
the short-focus optical lens meets the following conditions:
4.058mm is less than or equal to TTL is less than or equal to 4.233mm; wherein TTL is total mirror length;
EFL is more than or equal to 0.835mm and less than or equal to 0.880mm; wherein EFL is the effective focal length of the three-piece type short-focus optical lens;
Fno is more than or equal to 3.010 and less than or equal to 3.048; wherein FNO is the aperture value of the three-piece type short-focus optical lens;
21.495 degrees or less HFOV or less 21.721 degrees; wherein, HFOV is half angle of view of the three-piece short focal optical lens;
The imgh=0.338 mm; wherein ImgH is image height;
The |f| max is more than or equal to 1.83 and less than or equal to 1.85; wherein |f|max is the largest absolute value of focal length among the first lens to the third lens;
The |f| min is more than or equal to 0.507 and less than or equal to 0.510; wherein |f|min is the minimum absolute value of the focal length of the first lens element to the third lens element;
0.437≤∣f∣max/TTL≤0.454；
1.648≤EFL/∣f∣min≤1.725；
12.006≤TTL/ImgH≤12.524。
Further, the three-sheet type short-focal optical satisfies the following conditions: v2 is greater than or equal to V4, wherein V2 is the dispersion coefficient of the first lens, and V4 is the dispersion coefficient of the third lens.
Further, the three-sheet type short-focal optical satisfies the following conditions: v3 is greater than or equal to V4, wherein V3 is the dispersion coefficient of the second lens.
Further, the first lens, the second lens and the third lens are all plastic lenses.
The beneficial effects of the invention are as follows: three lenses are adopted for matching imaging structurally, the number of the lenses is small, the production cost is reduced, the total lens length is in the range of 4.058-4.233, the half field angle is in the range of 21.495-21.721 degrees, and the effects of short total lens and small lens size are achieved on the basis of ensuring the imaging quality.
Drawings
Fig. 1 is a schematic structural diagram of a three-piece type short-focal optical lens of embodiment 1.
Fig. 2 is a curvature of field aberration diagram of the three-piece type short focal optical lens of embodiment 1.
Fig. 3 is a distortion aberration diagram of the three-piece type short-focal optical lens of embodiment 1.
Fig. 4 is a longitudinal spherical aberration diagram of a three-piece type short focal optical lens of embodiment 1.
Fig. 5 is a schematic structural diagram of a three-piece type short-focal optical lens of embodiment 2.
Fig. 6 is a curvature of field aberration diagram of a three-piece type short focal optical lens of embodiment 2.
Fig. 7 is a distortion aberration diagram of the three-piece type short-focal optical lens of embodiment 2.
Fig. 8 is a longitudinal spherical aberration diagram of a three-piece type short focal optical lens of embodiment 2.
Fig. 9 is a schematic structural diagram of a three-piece type short-focal optical lens of embodiment 3.
Fig. 10 is a curvature of field aberration diagram of a three-piece type short focal optical lens of embodiment 3.
Fig. 11 is a distortion aberration diagram of the three-piece type short-focal optical lens of embodiment 3.
Fig. 12 is a longitudinal spherical aberration diagram of a three-piece type short focal optical lens of embodiment 3.
The reference numerals are: the optical lens comprises a first protective glass 10, a first lens 11, an aperture 16, a second lens 12, a third lens 13, a second protective glass 14 and a third protective glass 15.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but embodiments of the present invention are not limited thereto.
Example 1
As shown in fig. 1 to 4, a three-piece type short-focus optical lens is composed of a first protective glass 10, a first lens 11, an aperture 16, a second lens 12, a third lens 13, a second protective glass 14, and a third protective glass 15 in order from an object side to an image side; the first lens 11, the second lens 12 and the third lens 13 are all plastic lenses.
The first lens element 11 with negative refractive power has a concave object-side surface and a concave image-side surface, and the first lens element 11 has a concave object-side surface;
The second lens element 12 with positive refractive power has a convex object-side surface and a convex image-side surface, and the paraxial region of the second lens element 12 is convex;
The third lens element 13 with negative refractive power has a concave object-side surface and a concave image-side surface, and the third lens element 13 has a concave object-side surface;
the short-focus optical lens meets the following conditions:
4.058mm is less than or equal to TTL is less than or equal to 4.233mm; wherein TTL is total mirror length; in this embodiment, ttl= 4.059mm.
EFL is more than or equal to 0.835mm and less than or equal to 0.880mm; wherein EFL is the effective focal length of the three-piece type short-focus optical lens; in this embodiment, efl=0.835 mm.
Fno is more than or equal to 3.010 and less than or equal to 3.048; wherein FNO is the aperture value of the three-piece type short-focus optical lens; in this embodiment, fno= 3.026.
21.495 Degrees or less HFOV or less 21.721 degrees; wherein, HFOV is half angle of view of a three-piece short focal optical lens; in this embodiment, hfov= 21.495 degrees.
Imgh=0.338 mm; wherein ImgH is image height.
The |f| max is more than or equal to 1.83 and less than or equal to 1.85; wherein |f|max is the largest absolute value of focal length among the first lens 11 to the third lens 13; in this embodiment, |f|max=1.84.
The |f| min is more than or equal to 0.507 and less than or equal to 0.510; wherein |f|min is the minimum absolute value of the focal length of the first lens 11 to the third lens 13; in this embodiment, |f|min=0.507.
The ratio of the |f| max/TTL is more than or equal to 0.437 and less than or equal to 0.454; in this embodiment, |f|max/ttl=0.454.
EFL/|fmin 1.648.ltoreq.EFL/|min 1.725; in this embodiment, EFL/|f|min=1.648.
12.006 Is less than or equal to TTL/ImgH is less than or equal to 12.524; in this embodiment, TTL/imgh= 12.009.
The three-plate type short-focus optics meet the following conditions: v2 is equal to or greater than V4, wherein V2 is the dispersion coefficient of the first lens 11, and V4 is the dispersion coefficient of the third lens 13.
The three-plate type short-focus optics meet the following conditions: v3 is equal to or greater than V4, wherein V3 is the Abbe's number of the second lens 12.
Please refer to table 1 below, which is detailed optical data of the short-focal optical lens of example 1 of the present invention. The object-side surface of the first lens element 11 is denoted by a surface L1a, the image-side surface thereof is denoted by a surface L1b, and the other lens element surfaces will not be described again.
TABLE 1
Please refer to table 2, which shows the aspherical coefficients of each lens surface of example 1 of the present invention.
TABLE 2
Example 2
As shown in fig. 5 to 8, a three-piece type short-focus optical lens is composed of a first protective glass 10, a first lens 11, an aperture 16, a second lens 12, a third lens 13, a second protective glass 14, and a third protective glass 15 in order from an object side to an image side; the first lens 11, the second lens 12 and the third lens 13 are all plastic lenses.
The first lens element 11 with negative refractive power has a concave object-side surface and a concave image-side surface, and the first lens element 11 has a concave object-side surface;
The second lens element 12 with positive refractive power has a convex object-side surface and a convex image-side surface, and the paraxial region of the second lens element 12 is convex;
The third lens element 13 with negative refractive power has a concave object-side surface and a concave image-side surface, and the third lens element 13 has a concave object-side surface;
the short-focus optical lens meets the following conditions:
4.058mm is less than or equal to TTL is less than or equal to 4.233mm; wherein TTL is total mirror length; in this embodiment, ttl= 4.058mm.
EFL is more than or equal to 0.835mm and less than or equal to 0.880mm; wherein EFL is the effective focal length of the three-piece type short-focus optical lens; in this embodiment, efl=0.870 mm.
Fno is more than or equal to 3.010 and less than or equal to 3.048; wherein FNO is the aperture value of the three-piece type short-focus optical lens; in this embodiment, fno=3.048.
21.495 Degrees or less HFOV or less 21.721 degrees; wherein, HFOV is half angle of view of a three-piece short focal optical lens; in this embodiment, hfov= 21.545 degrees.
Imgh=0.338 mm; wherein ImgH is image height.
The |f| max is more than or equal to 1.83 and less than or equal to 1.85; wherein |f|max is the largest absolute value of focal length among the first lens 11 to the third lens 13; in this embodiment, |f|max=1.83.
The |f| min is more than or equal to 0.507 and less than or equal to 0.510; wherein |f|min is the minimum absolute value of the focal length of the first lens 11 to the third lens 13; in this embodiment, |f|min=0.508.
The ratio of the |f| max/TTL is more than or equal to 0.437 and less than or equal to 0.454; in this embodiment, |f|max/ttl=0.451.
EFL/|fmin 1.648.ltoreq.EFL/|min 1.725; in this embodiment, EFL/|f|min=1.714.
12.006 Is less than or equal to TTL/ImgH is less than or equal to 12.524; in this embodiment, TTL/imgh= 12.006.
The three-plate type short-focus optics meet the following conditions: v2 is equal to or greater than V4, wherein V2 is the dispersion coefficient of the first lens 11, and V4 is the dispersion coefficient of the third lens 13.
The three-plate type short-focus optics meet the following conditions: v3 is equal to or greater than V4, wherein V3 is the Abbe's number of the second lens 12.
Please refer to table 3 below, which is detailed optical data of the short-focal optical lens of example 2 of the present invention. The object-side surface of the first lens element 11 is denoted by a surface L1a, the image-side surface thereof is denoted by a surface L1b, and the other lens element surfaces will not be described again.
TABLE 3 Table 3
Please refer to table 4, which shows the aspherical coefficients of each lens surface of example 2 of the present invention.
TABLE 4 Table 4
Example 3
As shown in fig. 9 to 12, a three-piece type short-focus optical lens is composed of, in order from an object side to an image side, a first protective glass 10, a first lens 11, an aperture 16, a second lens 12, a third lens 13, a second protective glass 14, and a third protective glass 15; the first lens 11, the second lens 12 and the third lens 13 are all plastic lenses.
The first lens element 11 with negative refractive power has a concave object-side surface and a concave image-side surface, and the first lens element 11 has a concave object-side surface;
The second lens element 12 with positive refractive power has a convex object-side surface and a convex image-side surface, and the paraxial region of the second lens element 12 is convex;
The third lens element 13 with negative refractive power has a concave object-side surface and a concave image-side surface, and the third lens element 13 has a concave object-side surface;
the short-focus optical lens meets the following conditions:
4.058mm is less than or equal to TTL is less than or equal to 4.233mm; wherein TTL is total mirror length; in this embodiment, ttl= 4.233mm.
EFL is more than or equal to 0.835mm and less than or equal to 0.880mm; wherein EFL is the effective focal length of the three-piece type short-focus optical lens; in this embodiment, efl=0.880 mm.
Fno is more than or equal to 3.010 and less than or equal to 3.048; wherein FNO is the aperture value of the three-piece type short-focus optical lens; in this embodiment, fno=3.010.
21.495 Degrees or less HFOV or less 21.721 degrees; wherein, HFOV is half angle of view of a three-piece short focal optical lens; in this embodiment, hfov= 21.721 degrees.
Imgh=0.338 mm; wherein ImgH is image height.
The |f| max is more than or equal to 1.83 and less than or equal to 1.85; wherein |f|max is the largest absolute value of focal length among the first lens 11 to the third lens 13; in this embodiment, |f|max=1.85.
The |f| min is more than or equal to 0.507 and less than or equal to 0.510; wherein |f|min is the minimum absolute value of the focal length of the first lens 11 to the third lens 13; in this embodiment, |f|min=0.510.
The ratio of the |f| max/TTL is more than or equal to 0.437 and less than or equal to 0.454; in this embodiment, |f|max/ttl=0.437.
EFL/|fmin 1.648.ltoreq.EFL/|min 1.725; in this embodiment, EFL/|f|min=1.725.
12.006 Is less than or equal to TTL/ImgH is less than or equal to 12.524; in this embodiment, TTL/imgh= 12.524.
The three-plate type short-focus optics meet the following conditions: v2 is equal to or greater than V4, wherein V2 is the dispersion coefficient of the first lens 11, and V4 is the dispersion coefficient of the third lens 13.
The three-plate type short-focus optics meet the following conditions: v3 is equal to or greater than V4, wherein V3 is the Abbe's number of the second lens 12.
Please refer to the following table 5, which shows detailed optical data of the short-focal optical lens of the embodiment 3 of the present invention. The object-side surface of the first lens element 11 is denoted by a surface L1a, the image-side surface thereof is denoted by a surface L1b, and the other lens element surfaces will not be described again.
TABLE 5
Please refer to table 6, which shows the aspherical coefficients of each lens surface of example 3 of the present invention.
TABLE 6
The curve equation of the aspherical surface of each lens is expressed as follows:
wherein, X: the distance between the point on the aspheric surface, which is Y from the optical axis, and the tangent plane of the optical axis;
y: a perpendicular distance between a point on the aspherical surface and the optical axis;
R: radius of curvature of the lens at paraxial region;
k: conical surface coefficient;
a i: the i-th order aspheric coefficient.
The invention adopts three lenses to image in a matched way, the number of the lenses is small, the production cost is reduced, the total lens length is in the range of 4.058-4.233, the half field angle is in the range of 21.495-21.721 degrees, and the effects of the total lens length and the small lens volume are realized on the basis of ensuring the imaging quality.
The above examples represent only 3 embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (4)
1. The three-piece type short-focus optical lens is characterized by comprising a first protective glass (10), a first lens (11), an aperture (16), a second lens (12), a third lens (13), a second protective glass (14) and a third protective glass (15) in sequence from an object side to an image side;
The first lens element (11) with negative refractive power has a concave object-side paraxial region of the first lens element (11), and a concave image-side paraxial region of the first lens element (11);
The second lens element (12) with positive refractive power has a convex object-side paraxial region of the second lens element (12), and a convex image-side paraxial region of the second lens element (12);
the third lens element (13) with negative refractive power has a concave object-side paraxial region of the third lens element (13), and a concave image-side paraxial region of the third lens element (13);
the short-focus optical lens meets the following conditions:
4.058mm is less than or equal to TTL is less than or equal to 4.233mm; wherein TTL is total mirror length;
EFL is more than or equal to 0.835mm and less than or equal to 0.880mm; wherein EFL is the effective focal length of the three-piece type short-focus optical lens;
Fno is more than or equal to 3.010 and less than or equal to 3.048; wherein FNO is the aperture value of the three-piece type short-focus optical lens;
21.495 degrees or less HFOV or less 21.721 degrees; wherein, HFOV is half angle of view of the three-piece short focal optical lens;
imgh=0.338 mm; wherein ImgH is image height;
The size of the |f| max is less than or equal to 1.83mm and less than or equal to 1.85mm; wherein |f|max is the largest absolute value of focal length among the first lens (11) to the third lens (13);
The size of the |fmin is more than or equal to 0.507mm and less than or equal to 0.510mm; wherein |f|min is the minimum absolute value of focal length among the first lens (11) to the third lens (13);
0.437≤∣f∣max/TTL ≤0.454；
1.648≤EFL/∣f∣min≤ 1.725；
12.006≤TTL/ImgH≤12.524。
2. The three-piece short-focal optical lens of claim 1, wherein the three-piece short-focal optical lens satisfies the following condition: v2 is equal to or greater than V4, wherein V2 is the Abbe number of the first lens (11) and V4 is the Abbe number of the third lens (13).
3. The three-piece short-focal optical lens of claim 2, wherein the three-piece short-focal optical lens satisfies the following condition: v3 is greater than or equal to V4, wherein V3 is the Abbe's number of the second lens (12).
4. A three-piece short focal optical lens according to claim 3, characterized in that the first lens (11), the second lens (12) and the third lens (13) are all plastic lenses.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080072333A (en) * | 2007-02-02 | 2008-08-06 | 삼성전기주식회사 | Subminiature optical system |
| JP3162296U (en) * | 2009-06-19 | 2010-08-26 | 一品光学工業股▲ふん▼有限公司 | Compact short back focus 3-lens optical imaging lens system |
| CN110018555A (en) * | 2019-04-23 | 2019-07-16 | 广东旭业光电科技股份有限公司 | A kind of optical imaging system and photographic device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10845573B2 (en) * | 2018-11-06 | 2020-11-24 | Newmax Technology Co., Ltd. | Three-piece compact optical lens system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080072333A (en) * | 2007-02-02 | 2008-08-06 | 삼성전기주식회사 | Subminiature optical system |
| JP3162296U (en) * | 2009-06-19 | 2010-08-26 | 一品光学工業股▲ふん▼有限公司 | Compact short back focus 3-lens optical imaging lens system |
| CN110018555A (en) * | 2019-04-23 | 2019-07-16 | 广东旭业光电科技股份有限公司 | A kind of optical imaging system and photographic device |
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