CN112327451A - 4-piece wide-angle small-head lens - Google Patents
4-piece wide-angle small-head lens Download PDFInfo
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- CN112327451A CN112327451A CN202011283465.4A CN202011283465A CN112327451A CN 112327451 A CN112327451 A CN 112327451A CN 202011283465 A CN202011283465 A CN 202011283465A CN 112327451 A CN112327451 A CN 112327451A
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- lens
- head
- aspheric
- angle
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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
- G02B13/004—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 four 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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- Physics & Mathematics (AREA)
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- Optics & Photonics (AREA)
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Abstract
The invention relates to a 4-piece wide-angle small-head lens, which is characterized in that a first lens, a second lens, a third lens and a fourth lens are sequentially arranged from the object side to the image side; the first lens has negative refractive power, the object side surface is a concave surface, and the image side surface is a convex surface; the second lens has positive refractive power, and the object side of the second lens is a convex surface and the image side of the second lens is a concave surface; the third lens has positive refractive power, and both the object side and the image side are convex surfaces; the fourth lens element with negative refractive power has a convex object side and a concave image side. The convex surface and the concave surface are both aspheric surfaces. The lens system satisfies: -15< (R1+ R2)/(R1-R2) <0 wherein R1 is the radius of curvature of the object side surface of the first lens; r2 is the radius of curvature of the image-side surface of the first lens; the size of the head of the lens can be reduced, and the requirement of a small head can be met. SD1 is less than or equal to 0.98, and VP is less than or equal to 0.39, wherein SD1 is the aperture of the 1 st lens, and VP is the viewpoint depth of the optical lens. The characteristic of small opening of the small end of the mobile phone is met, and therefore the requirement of a full screen is met.
Description
Technical Field
The invention relates to a 4-piece wide-angle small-head lens which is suitable for the field of smart phones or ultrathin video cameras.
Background
With the continuous innovation of the photographing function and the photographing mode of the smart phone, the requirements of people on the photographing function of the camera of the smart phone are not limited to high resolution and large aperture, but develop towards a more novel direction, namely the wide-angle end; meanwhile, in order to meet the requirement of a comprehensive screen of a mobile phone, a mobile phone lens needs to meet the requirements of smaller head outer diameter size, smaller viewpoint depth and longer head depth.
Disclosure of Invention
The invention provides a 4-piece wide-angle small-head lens.
The technical scheme adopted by the invention is as follows:
a4-piece wide-angle small-head lens is characterized in that a first lens, a second lens, a third lens and a fourth lens are sequentially arranged from an object side to an image side; the first lens has negative refractive power, the object side surface is a concave surface, and the image side surface is a convex surface;
preferably, the second lens has positive refractive power, and has a convex object side and a concave image side;
preferably, the third lens has positive refractive power, and is convex on the object side and the image side;
preferably, the fourth lens element has negative refractive power, and has a convex object side and a concave image side.
Preferably, the convex surface and the concave surface are both aspheric.
Preferably, the lens barrel satisfies the following relation:
-15<(R1+R2)/(R1-R2)<0
wherein R1 is the radius of curvature of the object-side surface of the first lens; r2 is the radius of curvature of the image-side surface of the first lens; the condition is used for limiting the shape of the first lens, and is beneficial to improving the performance and processing and producing the first lens
SD1≤0.98
VP<0.39
Wherein SD1 is the aperture of the 1 st lens, and VP is the viewpoint depth of the optical lens; the condition is used for limiting the size of the head of the mobile phone lens and reducing the size of a window of a mobile phone screen, so that the requirements of small head and full screen are met.
IH/TTL≤0.48
(Ct2+Ct5+Ct7+Ct10)/TTL>0.67
Wherein IH is half image height (1.54); TTL is the total length of the optical lens; CT1, CT4, CT6 and CT8 are the center thicknesses of the lens 1, the lens 2, the lens 3 and the lens 4, respectively. The condition is used for increasing the length of the mobile phone lens, so that the head depth of the lens is increased, and the requirement of an extremely narrow frame structure is met.
Preferably, the lens barrel satisfies the following relation:
CRAY≥33.3°
the CRAY is the maximum chief ray angle in all the fields of view of the optical system. The condition is used for controlling the emergent angle of the principal ray of the lens, so that the lens can be matched with a larger CRA chip.
∣F3/F1∣≤0.055
Wherein F3 is the focal length of the third lens; f1 is the focal length of the first lens. The condition is used for restraining the refractive power of the first lens and the third lens, so that the effects of balancing aberration and improving resolution are achieved.
Angle S8≤54°
Wherein Angle S8 is the face Angle of the R1 face of the fourth lens; this condition is used to constrain the face angle of the face of the fourth lens R1 to make it easier to machine.
Preferably, the lens barrel further satisfies the following relation:
FBL≥0.75
the FBL is the minimum distance from the S9 plane to the image plane S12 in the optical system, and the condition restricts the distance from the lens barrel to the imaging plane, so that the assembly of a module factory is facilitated.
Preferably, the first lens, the second lens, the third lens and the fourth lens all adopt even-order aspheric plastic lenses, and aspheric coefficients satisfy the following equation:
Z＝cy2/[1+{1－(1+k)c2y2}+1/2]+A4y4+A6y6+A8y8+A10y10+A12y12+A14y14+A16y16+A18y18+A20y20
wherein Z is aspheric sagittal height, c is aspheric paraxial curvature, y is lens caliber, k is cone coefficient, A4Is a 4-order aspheric coefficient, A6Is a 6-degree aspheric surface coefficient, A8Is an 8 th order aspheric surface coefficient, A10Is a 10 th order aspheric surface coefficient, A12Is 12-order aspheric surface coefficient,A14Is a 14 th order aspheric coefficient, A16Is a 16-degree aspheric surface coefficient, A18Is an 18 th order aspheric coefficient, A20Is a 20-degree aspheric coefficient.
The invention has the advantages that:
the invention adopts a 4-piece structure to realize that the head has small outer diameter, the head depth is close to the thickness of a mobile phone screen, the TTL length is basically the same as the thicknesses of the mobile phone screen and a glass cover plate, the large wide-angle FOV is 101.5 degrees (1.0F), the aperture Fno2.2 is a bright lens, the maximum image circle is larger than phi 3.28, and the 2M chip can be matched with a larger CRA.
Drawings
FIG. 1 is a two-dimensional view of example 1 of the present invention.
Fig. 2 is a graph of MTF transfer function of embodiment 1 of the present invention.
Fig. 3 is an optical distortion curve of embodiment 1 of the present invention.
FIG. 4 is a CRA curve of example 1 of the present invention.
Fig. 5 is a two-dimensional diagram of embodiment 2 of the present invention.
Fig. 6 is a graph of MTF transfer function for embodiment 2 of the present invention.
Fig. 7 is an optical distortion curve of embodiment 2 of the present invention.
FIG. 8 shows the CRA curve of example 2 of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying figures 1-8 and examples.
A4-piece wide-angle small-head lens is characterized in that a first lens, a second lens, a third lens and a fourth lens are sequentially arranged from an object side to an image side; the first lens has negative refractive power, the object side surface is a concave surface, and the image side surface is a convex surface;
preferably, the second lens has positive refractive power, and has a convex object side and a concave image side;
preferably, the third lens has positive refractive power, and is convex on the object side and the image side;
preferably, the fourth lens element has negative refractive power, and has a convex object side and a concave image side.
Preferably, the convex surface and the concave surface are both aspheric.
Example 1
In this embodiment, the FOV (1.0F) of the lens is 101.5 °, the aperture value is fno2.2, the half image height IH 1.54, the optical TTL3.43, the optical back focus FBL 0.75, and the object-side surface of the first lens having negative refractive power is a concave surface and the image-side surface is a convex surface. The design parameters of the lens are shown in table one (a) and table one (b):
watch 1 (a)
Watch 1 (b)
In this embodiment, the corresponding parameter table in the embodiment:
watch 1 (c)
| DFOV | 101.5° |
| Fno | 2.2 |
| efl | 1.72 |
| IH | 1.54 |
| FBL | 0.75 |
| R2+R3/R2-R3 | -1.34 |
| VP | 0.386 |
| AngleS8 | 53.7° |
| SDS1 | 0.98 |
| F3/F1 | -0.05 |
| CRAY | 33.48 |
| IH/TTL | 0.48 |
| (Ct1+Ct4+Ct6+Ct8)/TTL | 0.695 |
Fig. 1 is a 2D structural view of embodiment 1.
FIG. 2 is a graph of MTF transfer function of example 1, with a higher resolution at 90lp/mm (1/4 sampling frequency) with a field MTF of 0.8.
Fig. 3 is a field curvature & distortion curve of example 1, and at a large wide angle of fov 101.5.5 °, the 1.0F optical distortion is less than 28.0%, and the distortion can be kept small to ensure the imaging quality.
Fig. 4 is the CRA curve of example 1, with illuminance greater than 25% and the maximum CRA of 33.48, meeting the requirements of a larger CRA chip.
Example 2
In this embodiment, the FOV (1.0F) of the lens is 101.5 °, the aperture value is fno2.2, the half-image height IH 1.54, the optical TTL3.43, the optical back focus FBL 0.75, and the object-side surface of the first lens having negative refractive power is a concave surface and the image-side surface is a convex surface. The design parameters of the lens are shown in table two (a) and table two (b):
watch two (a)
| Surface number | Surface type | Radius of curvature | Thickness of | Material Property (Nd: Vd) |
| Article (A) | Spherical surface | Infinite number of elements | 400 | |
| Stop | Spherical surface | Infinite number of elements | 0.037471 | |
| 2 | Aspherical surface | -2.09604 | 0.248293 | 1.5445:55.987 |
| 3 | Aspherical surface | -2.40203 | 0.015085 | |
| 4 | Aspherical surface | 4.511406 | 0.57645 | 1.6612：20.354 |
| 5 | Aspherical surface | -7.17882 | 0.029749 | |
| 6 | Aspherical surface | -8.04396 | 0.697003 | 1.5445:55.987 |
| 7 | Aspherical surface | -0.56436 | 0.057092 | |
| 8 | Aspherical surface | -6.29921 | 0.658639 | 1.6612：20.354 |
| 9 | Aspherical surface | 0.873825 | 0.270856 | |
| Spherical surface | Infinite number of elements | 0.21 | BK7 | |
| Spherical surface | Infinite number of elements | 0.448215 | ||
| IMA | Spherical surface | Infinite number of |
0 |
Watch two (b)
In this embodiment, the corresponding parameter table in the embodiment:
watch two (c)
| DFOV | 101.1° |
| Fno | 2.2 |
| efl | 1.70 |
| IH | 1.54 |
| FBL | 0.75 |
| R2+R3/R2-R3 | -14.7 |
| VP | 0.31 |
| AngleS8 | 53.0° |
| SDS1 | 0.76 |
| F3/F1 | 0.025 |
| CRAY | 36.0 |
| IH/TTL | 0.47 |
| (Ct1+Ct4+Ct6+Ct8)/TTL | 0.67 |
In the optical transfer function (MTF), T represents a modulation transfer function in the meridional direction, and S direction represents a modulation transfer function in the sagittal direction.
The embodiments of the present invention have been described in detail, but the description is only for the purpose of describing the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the invention are also within the scope of the present patent.
Claims (10)
1. A4-piece wide-angle small-head lens is characterized in that a first lens, a second lens, a third lens and a fourth lens are arranged in sequence from an object side surface to an image side;
the first lens has negative refractive power, and the object side surface is a concave surface and the image side surface is a convex surface.
2. A4-piece wide-angle small-head lens according to claim 1,
the second lens has positive refractive power, and has a convex object side and a concave image side.
3. A4-piece wide-angle small-head lens according to claim 1,
the third lens has positive refractive power, and is convex on both the object side and the image side.
4. A4-piece wide-angle small-head lens according to claim 1,
the fourth lens element with negative refractive power has a convex object side and a concave image side.
5. A4-lens wide-angle small-head lens as claimed in claim 2, 3 or 4,
the convex surface and the concave surface are both aspheric surfaces.
6. A4-piece wide-angle small-head lens according to claim 1,
the lens satisfies the following relation:
-15<(R1+R2)/(R1-R2)<0
wherein R1 is the radius of curvature of the object-side surface of the first lens; r2 is the radius of curvature of the image-side surface of the first lens;
SD1≤0.98
VP≤0.39
wherein SD1 is the aperture of the first lens, VP is the viewpoint depth of the lens, and 1.0F is relative to the S1 plane;
IH/TTL≤0.48
(Ct1+Ct4+Ct6+Ct8)/TTL≥0.67
wherein IH is half image height (1.54); TTL is the total length of the optical lens; CT1, CT4, CT6 and CT8 are the center thicknesses of the lens 1, the lens 2, the lens 3 and the lens 4, respectively.
7. A4-piece wide-angle small-head lens according to claim 1,
the lens satisfies the following relation:
CRAY≥33.3°
wherein, CRAY is the maximum chief ray angle in all the visual fields of the optical system;
∣F3/F1∣≤0.055
wherein F3 is the focal length of the third lens; f1 is the focal length of the first lens.
8. A4-piece wide-angle small-head lens according to claim 1,
the lens satisfies the following relation:
Angle S8≤54°
wherein Angle S8 is the face Angle of the R1 face of the fourth lens.
9. A4-piece wide-angle small-head lens according to claim 1,
the lens further satisfies the following relation:
FBL≥0.75
where FBL is the minimum distance from the S9 plane to the image plane S12 in the optical system.
10. A photographic optical lens as claimed in claim 1, characterized in that: the first lens, the second lens, the third lens and the fourth lens all adopt even-order aspheric plastic lenses, and aspheric coefficients meet the following equation:
Z＝cy2/[1+{1－(1+k)c2y2}+1/2]+A4y4+A6y6+A8y8+A10y10+A12y12+A14y14+A16y16+A18y18+A20y20
wherein Z is aspheric sagittal height, c is aspheric paraxial curvature, y is lens caliber, k is cone coefficient, A4Is a 4-order aspheric coefficient, A6Is a 6-degree aspheric surface coefficient, A8Is an 8 th order aspheric surface coefficient, A10Is a 10 th order aspheric surface coefficient, A12Is a 12 th order aspheric surface coefficient, A14Is a 14 th order aspheric coefficient, A16Is a 16-degree aspheric surface coefficient, A18Is an 18 th order aspheric coefficient, A20Is a 20-degree aspheric coefficient.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011283465.4A CN112327451A (en) | 2020-11-17 | 2020-11-17 | 4-piece wide-angle small-head lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011283465.4A CN112327451A (en) | 2020-11-17 | 2020-11-17 | 4-piece wide-angle small-head lens |
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| Publication Number | Publication Date |
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| CN112327451A true CN112327451A (en) | 2021-02-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011283465.4A Withdrawn CN112327451A (en) | 2020-11-17 | 2020-11-17 | 4-piece wide-angle small-head lens |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113093368A (en) * | 2021-04-13 | 2021-07-09 | 浙江舜宇光学有限公司 | Optical imaging lens |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006201674A (en) * | 2005-01-24 | 2006-08-03 | Seiko Epson Corp | Wide angle imaging lens |
| JP2009008867A (en) * | 2007-06-27 | 2009-01-15 | Kyocera Corp | Imaging lens |
| CN110850558A (en) * | 2019-12-20 | 2020-02-28 | 辽宁中蓝光电科技有限公司 | Super wide-angle camera lens |
| CN111273427A (en) * | 2020-03-20 | 2020-06-12 | 辽宁中蓝光电科技有限公司 | High-pixel four-piece type ultra-wide-angle lens |
| CN210864174U (en) * | 2019-12-20 | 2020-06-26 | 辽宁中蓝光电科技有限公司 | Super wide-angle camera lens |
| CN212229310U (en) * | 2020-07-06 | 2020-12-25 | 辽宁中蓝光电科技有限公司 | Small-head mobile phone lens of wide angle |
-
2020
- 2020-11-17 CN CN202011283465.4A patent/CN112327451A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006201674A (en) * | 2005-01-24 | 2006-08-03 | Seiko Epson Corp | Wide angle imaging lens |
| JP2009008867A (en) * | 2007-06-27 | 2009-01-15 | Kyocera Corp | Imaging lens |
| CN110850558A (en) * | 2019-12-20 | 2020-02-28 | 辽宁中蓝光电科技有限公司 | Super wide-angle camera lens |
| CN210864174U (en) * | 2019-12-20 | 2020-06-26 | 辽宁中蓝光电科技有限公司 | Super wide-angle camera lens |
| CN111273427A (en) * | 2020-03-20 | 2020-06-12 | 辽宁中蓝光电科技有限公司 | High-pixel four-piece type ultra-wide-angle lens |
| CN212229310U (en) * | 2020-07-06 | 2020-12-25 | 辽宁中蓝光电科技有限公司 | Small-head mobile phone lens of wide angle |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113093368A (en) * | 2021-04-13 | 2021-07-09 | 浙江舜宇光学有限公司 | Optical imaging lens |
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Application publication date: 20210205 |
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