CN211478737U - Three-piece small-head wide-angle lens - Google Patents
Three-piece small-head wide-angle lens Download PDFInfo
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- CN211478737U CN211478737U CN201922391340.2U CN201922391340U CN211478737U CN 211478737 U CN211478737 U CN 211478737U CN 201922391340 U CN201922391340 U CN 201922391340U CN 211478737 U CN211478737 U CN 211478737U
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Abstract
The utility model relates to a little first wide-angle lens of three formula, its technical essential is, contains according to the preface by thing side to image side along the optical axis: a first lens element L1 having positive refractive power and having a convex object-side surface at the optical axis; a second lens L2 having a convex image-side surface at the optical axis; a third lens element L3 having a convex object-side surface and a concave image-side surface; the diaphragm is positioned on the side of the first lens object or between the first lens and the second lens. The wide-angle lens can realize a bright lens with a large wide-angle FOV larger than 104 degrees (1.0F FOV) and an aperture value of Fno2.0, and has good performance in shooting in a dark environment.
Description
Technical Field
The utility model relates to a high pixel camera lens of super wide angle specifically is a three-piece formula microcephaly wide-angle lens, is applicable to smart mobile phone or ultra-thin video camera device.
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.
With the increasingly changing development trend of the electronic market, besides the high requirements for the characteristics of high resolution, large aperture, ultra-thin type and the like, the large field angle is a development direction which is worth paying attention to. The field angle of the mainstream lens in the current market is generally between 70 degrees and 80 degrees, and in order to meet the practical requirements of the electronic market, the lens with a large field angle is urgently needed to be designed on the basis of meeting high-quality imaging and the like.
Disclosure of Invention
Under above-mentioned background demand, the utility model provides a little first wide-angle lens of three-piece formula can realize that big wide-angle FOV >104 (1.0F FOV), and the aperture value is the bright camera lens of Fno2.0, makes a video recording also has fine performance under darker environment.
The technical scheme of the utility model is that:
a three-piece small-head wide-angle lens is provided, which comprises, in order from an object side to an image side along an optical axis: a first lens element L1 having positive refractive power and having a convex object-side surface at the optical axis; a second lens L2 having a convex image-side surface at the optical axis; a third lens element L3 having a convex object-side surface and a concave image-side surface; the diaphragm is arranged on the side of the first lens object or between the first lens and the second lens, and the following conditional expressions are satisfied:
0.54<(ct1+ct2+ct3)/TTL<0.8
SD S1/IH<0.36
wherein ct1, ct2 and ct3 are the central thicknesses of the first lens, the second lens and the third lens respectively; TTL is the total optical length of the lens; SD S1 is half of the first lens effective diameter; IH is half image high.
The three-piece small-head wide-angle lens further meets the following conditional expression:
IH/TTL<0.54
wherein, TTL is the optical total length of the lens; IH is half image high. The conditional expression is used for reducing the total thickness of the lens, thereby reducing the thickness of the mobile phone.
The three-piece small-head wide-angle lens further meets the following conditional expression:
0.8<f1/f<4.2
wherein f1 is the focal length of the first lens; f is the focal length of the lens. The conditional expression is used for adjusting the refractive power of the first lens element to improve the imaging quality, and exceeding the upper limit or the lower limit will be unfavorable for the system to correct the aberration and is difficult to improve the resolution of the system.
The three-piece small-head wide-angle lens further meets the following conditional expression:
-1.0<f2/f3<0.8
wherein f2 is the focal length of the second lens; f3 is the focal length of the third lens. The conditional expression is used for restricting the focal power of the second lens and the third lens, the reasonable distribution is beneficial to improving the optical performance, the sensitivity in production can be better reduced, and the yield is improved.
The three-piece small-head wide-angle lens further meets the following conditional expression:
-1.35<(R7+R8)/(R7-R8)<1.25
wherein R7 is the radius of curvature of the object-side surface of the third lens; r8 is the radius of curvature of the image-side surface of the third lens. The conditional expression is used for limiting the shape of the third lens, and is beneficial to the improvement of the performance and the processing and production of the third lens.
The three-piece small-head wide-angle lens further meets the following conditional expression:
20.0<CRA Y<32.3
CRA Y is the maximum chief ray angle in all the fields of view of the lens. The conditional expression is used for controlling the chief ray angle of the lens so as to realize the compatibility of two or more chips at the same time, thereby being beneficial to realizing high resolution.
In the three-piece small-head wide-angle lens, the first lens L1, the second lens L2 and the third lens L3 are all 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 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.
The utility model has the advantages that:
the lens is composed of a lens with a concave-convex mirror surface and a positive refractive power reasonably, Fno2.0 can be realized, FOV is more than 104 degrees, the large aperture and the wide angle can meet the shooting requirement of the front camera lens of the mobile phone at present, and the cost is reduced by the three-piece type. The conditional SD S1/IH is less than 0.36, is used for restricting the effective diameter of the first lens, is beneficial to reducing the head size of the lens, enables the external diameter of the lens to be small, is suitable for a mobile phone with a very narrow frame and realizes a full screen; the conditional expression 0.54< ct1+ ct2+ ct3/TTL <0.8 is used to control the proportion of the total thickness of the lens to the total length, so as to adjust the length of the lens according to the requirements of different mobile phone structures, thereby satisfying the structural requirements, being beneficial to the improvement of optical performance and being helpful to the lens molding.
Drawings
Fig. 1 is a 2D structure diagram of a lens barrel according to embodiment 1 of the present invention;
fig. 2 is an MTF transfer function curve of the lens shown in embodiment 1;
fig. 3 is a 2D structure diagram of the lens barrel according to embodiment 2 of the present invention;
fig. 4 is an MTF transfer function curve of the lens shown in embodiment 2.
In the figure: a first lens L1, a second lens L2, a third lens L3;
2. the lens comprises a first lens object side surface, a first lens image side surface, a first lens stop, a second lens object side surface, a second lens image side surface, a second lens object side surface, a third lens object side surface and a third lens image side surface, wherein the first lens object side surface is 3, the first lens image side surface is 4, the second lens stop is 5, the second lens object side surface is 6, the second lens image side surface is 7.
Detailed Description
Example 1
As shown in fig. 1, the three-piece small-head wide-angle lens, in order from an object side to an image side along an optical axis, comprises: a first lens element L1 having positive refractive power, the object-side surface being convex at the optical axis and the image-side surface being concave at the optical axis; a second lens L2 having positive refractive power, the object-side surface and the image-side surface being convex at the optical axis; and a third lens element L3 with negative refractive power having a convex object-side surface at the optical axis and a concave image-side surface at the optical axis. The diaphragm is located between the first lens and the second lens. Simultaneously satisfies the following conditional expressions:
0.54<(ct1+ct2+ct3)/TTL<0.8
SD S1/IH<0.36
IH/TTL<0.54
0.8<f1/f<4.2
-1.0<f2/f3<0.8
-1.35<(R7+R8)/(R7-R8)<1.25
20.0<CRA Y<32.3
wherein ct1, ct2 and ct3 are the central thicknesses of the first lens, the second lens and the third lens respectively; TTL is the total optical length of the lens; SD S1 is half of the first lens effective diameter; IH is half image height; f is the focal length of the lens; f1 is the focal length of the first lens; f2 is the focal length of the second lens; f3 is the focal length of the third lens; r7 is the radius of curvature of the object-side surface of the third lens; r8 is the radius of curvature of the image-side surface of the third lens; CRA Y is the largest chief ray angle among all the fields of view of the lens.
The first lens L1, the second lens L2 and the third lens L3 are all 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, and y is mirrorHead diameter, k is the 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.
In this embodiment, the field angle FOV (1.0F) of the lens is 104.4 °, the aperture value fno2.0, the half-image height ih1.54mm, the optical ttl2.97mm, and the optical back focus FBL 0.77 mm. The specific design parameters of the lens are shown in table one (a) and table one (b).
Watch 1 (a)
Watch 1 (b)
| Flour mark | 2 | 3 | 5 | 6 | 7 | 8 |
| k | 7.5328E+00 | 1.3321E+01 | 3.5339E+00 | -6.8544E+00 | 3.9823E+01 | -4.5780E+00 |
| A4 | -1.5870E-01 | -6.9293E-01 | -5.0682E-01 | -2.6581E+00 | -8.5384E-01 | -9.1296E-01 |
| A6 | -9.8551E+00 | -1.0328E+01 | -8.6450E+00 | 1.3850E+01 | -1.9353E+00 | 2.7323E+00 |
| A8 | 1.4573E+02 | 2.2417E+02 | 1.3277E+02 | -5.2763E+01 | 2.6308E+01 | -6.2436E+00 |
| A10 | -1.2288E+03 | -2.8435E+03 | -1.3628E+03 | 1.2765E+02 | -1.2102E+02 | 9.7074E+00 |
| A12 | 5.5758E+03 | 1.9232E+04 | 7.5308E+03 | -1.8738E+02 | 3.1600E+02 | -1.0113E+01 |
| A14 | -1.2931E+04 | -6.6080E+04 | -2.1527E+04 | 1.5054E+02 | -5.0492E+02 | 6.8643E+00 |
| A16 | 1.1900E+04 | 9.0756E+04 | 2.5248E+04 | -5.0136E+01 | 4.8891E+02 | -2.8879E+00 |
| A18 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | -2.6370E+02 | 6.7717E-01 |
| A20 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 6.0772E+01 | -6.6923E-02 |
The corresponding parameters in this embodiment are shown in table one (c):
watch 1 (c)
Referring to fig. 2, for the MTF transfer function curve of embodiment 1, the MTF of the central field is greater than 0.76 at 1/4 frequency, and the lens has higher resolving power.
Example 2
As shown in fig. 3, the three-piece small-head wide-angle lens, in order from an object side to an image side along an optical axis, comprises: a first lens element L1 having positive refractive power, the object-side surface being convex at the optical axis and the image-side surface being convex at the optical axis; a second lens element L2 having negative refractive power, the object-side surface being concave at the optical axis and the image-side surface being convex at the optical axis; and a third lens element L3 having positive refractive power, the object-side surface being convex at the optical axis and the image-side surface being concave at the optical axis. The stop is located on an object side of the first lens.
In this embodiment, the field angle FOV (1.0F) of the lens is 104.4 °, the aperture value is fno2.0, the half-image height ih1.54mm, the optical ttl2.97mm, and the optical back focus FBL is 0.77 mm. The design parameters of the lens are shown in table two (a) and table two (b).
Watch two (a)
Watch two (b)
The corresponding parameters in this embodiment are shown in table two (c):
watch two (c)
| ct1+ct2+ct3/TTL | 0.5471 |
| IH/TTL | 0.5385 |
| SD S1/IH | 0.2092 |
| f1/f | 0.84 |
| f2/f3 | -0.8198 |
| (R7+R8)/(R7-R8) | -1.3194 |
| CRA | 20.57 |
Referring to fig. 4, the MTF transfer function curve of example 2, with a central field of view MTF greater than 0.78 at 1/4, has higher resolution.
The embodiments of the present invention have been described in detail, but the description is only for 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 present invention should be covered by the present patent.
Claims (7)
1. A three-lens small-head wide-angle lens, in order from an object side to an image side along an optical axis, comprising: a first lens element L1 having positive refractive power and having a convex object-side surface at the optical axis; a second lens L2 having a convex image-side surface at the optical axis; a third lens element L3 having a convex object-side surface and a concave image-side surface; the diaphragm is arranged on the side of the first lens object or between the first lens and the second lens, and the following conditional expressions are satisfied:
0.54<(ct1+ct2+ct3)/TTL<0.8
SD S1/IH<0.36
wherein ct1, ct2 and ct3 are the central thicknesses of the first lens, the second lens and the third lens respectively; TTL is the total optical length of the lens; SD S1 is half of the first lens effective diameter; IH is half image high.
2. The three-piece small-head wide-angle lens according to claim 1, further satisfying the following conditional expression:
IH/TTL<0.54
wherein, TTL is the optical total length of the lens; IH is half image high.
3. The three-piece small-head wide-angle lens according to claim 1, further satisfying the following conditional expression:
0.8<f1/f<4.2
wherein f1 is the focal length of the first lens; f is the focal length of the lens.
4. The three-piece small-head wide-angle lens according to claim 1, further satisfying the following conditional expression:
-1.0<f2/f3<0.8
wherein f2 is the focal length of the second lens; f3 is the focal length of the third lens.
5. The three-piece small-head wide-angle lens according to claim 1, further satisfying the following conditional expression:
-1.35<(R7+R8)/(R7-R8)<1.25
wherein R7 is the radius of curvature of the object-side surface of the third lens; r8 is the radius of curvature of the image-side surface of the third lens.
6. The three-piece small-head wide-angle lens according to claim 1, further satisfying the following conditional expression:
20.0<CRA Y<32.3
CRA Y is the maximum chief ray angle in all the fields of view of the lens.
7. The three-piece small-head wide-angle lens according to claim 1, wherein the first lens L1, the second lens L2 and the third lens L3 are all even 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 a 12 th order aspheric surface coefficient, A14Is an aspherical coefficient of degree 14、A16Is a 16-degree aspheric surface coefficient, A18Is an 18 th order aspheric coefficient, A20Is a 20-degree aspheric coefficient.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922391340.2U CN211478737U (en) | 2019-12-27 | 2019-12-27 | Three-piece small-head wide-angle lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922391340.2U CN211478737U (en) | 2019-12-27 | 2019-12-27 | Three-piece small-head wide-angle lens |
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| CN211478737U true CN211478737U (en) | 2020-09-11 |
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Denomination of utility model: Three piece small head wide angle lens Effective date of registration: 20210726 Granted publication date: 20200911 Pledgee: China Construction Bank Corporation Panjin branch Pledgor: Liaoning Zhonglan Photoelectric Technology Co.,Ltd. Registration number: Y2021210000049 |