CN113467049B - 5P small-mounting-hole optical lens - Google Patents
5P small-mounting-hole optical lens Download PDFInfo
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- CN113467049B CN113467049B CN202110736792.9A CN202110736792A CN113467049B CN 113467049 B CN113467049 B CN 113467049B CN 202110736792 A CN202110736792 A CN 202110736792A CN 113467049 B CN113467049 B CN 113467049B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 62
- 238000003384 imaging method Methods 0.000 claims abstract description 11
- 230000005499 meniscus Effects 0.000 claims abstract description 7
- 238000010586 diagram Methods 0.000 description 10
- 230000004075 alteration Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
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- 102220099567 rs878853749 Human genes 0.000 description 3
- 239000006185 dispersion Substances 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
- G02B13/0045—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 five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/041—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
- G02B13/18—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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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles
Abstract
The invention discloses a 5P small mounting hole optical lens, which is sequentially provided with a first lens, a second lens, a third lens, a fourth lens, a fifth lens and an imaging surface from an object side to an image side along an optical axis; the first lens is a positive lens, and at least one surface of the first lens is an aspheric surface; the second lens is a negative lens with a meniscus structure, wherein the convex surface of the negative lens faces the object side and the concave surface of the negative lens faces the image side, and at least one surface of the negative lens is an aspheric surface; the third lens is a positive lens with a meniscus structure, wherein the total concave surface of the positive lens faces the object side, the total convex surface of the positive lens faces the image side, and at least one surface of the positive lens is an aspheric surface; the fourth lens is a positive lens with a concave surface facing the object side and a convex surface facing the image side, and at least one surface of the fourth lens is an aspheric surface; the fifth lens is a negative lens with a concave center on both the object side and the image side, and at least one surface of the fifth lens is an aspheric surface. In order to meet the market development trend, the invention uses 5 plastic lenses, and the diameter of the front part of the lens is small under the conditions of meeting high-definition imaging and larger chip size, so that the diameter of a lens mounting hole on a mobile phone is small.
Description
Technical Field
The invention relates to the technical field of imaging, in particular to an optical lens with a 5P small mounting hole.
Background
With the development of science and technology, many current intelligent electronic products are pursuing three-dimensional, high-multiple and high-resolution images. The lens also needs to have large aperture, high pixel and high cost performance. At present, mobile phones are thinner and thinner, the camera shooting quality is higher and higher, and a front camera lens is required to occupy the space as small as possible on a front panel of the mobile phone.
Disclosure of Invention
In view of the above, the invention provides a 5P small-mounting-hole optical lens, which has a small diameter at the front part of the lens under the conditions of satisfying high-definition imaging and a larger chip size, so that the diameter of a mounting opening of the lens on a mobile phone is small, and the occupied space of a panel of the mobile phone is small; meanwhile, the total length of the lens is short, and the requirement of ultra-thin mobile phone is met.
In order to achieve the purpose, the invention provides the following technical scheme:
a 5P small mount aperture optical lens, comprising: a first lens (L1), a second lens (L2), a third lens (L3), a fourth lens (L4), a fifth lens (L5), and an imaging surface, which are arranged in this order from the object side to the image side along the optical axis; the first lens (L1) is a positive lens, and at least one surface of the first lens is an aspheric surface; the second lens (L2) is a negative lens with a meniscus structure, wherein the convex surface of the negative lens faces the object side and the concave surface of the negative lens faces the image side, and at least one surface of the negative lens is aspheric; the third lens (L3) is a positive lens with a meniscus structure, wherein the concave surface of the positive lens faces the object side and the convex surface of the positive lens faces the image side, and at least one surface of the positive lens is an aspheric surface; the fourth lens (L4) is a positive lens with a concave surface facing the object side and a convex surface facing the image side, and at least one surface of the fourth lens is aspheric; the fifth lens (L5) is a negative lens with concave centers on both the object side and the image side, and at least one surface of the fifth lens is aspheric; the first lens (L1) and second lens (L2) are combined into a front group having a focal length of f 12; the third lens (L3), the fourth lens (L4) and the fifth lens (L5) are combined into a rear group, the rear group focal length is f35, and the following conditions are also met: 0.02< | f12/f35| < 0.35; and 0.20< SD1/EFL < 0.32.
In a preferred embodiment, the 5P small mounting hole optical lens further includes an aperture provided at an object side surface of the first lens (L1) or at an effective diameter edge of the first surface (S2) of the first lens (L1) or in front of the first surface (S2) of the first lens (L1).
In a preferred embodiment, the outer diameter of the first lens (L1), the outer diameter of the second lens (L2), and the outer diameter of the third lens (L3) are all smaller than the outer diameter of the fourth lens (L4).
In a preferred embodiment, the outer diameters of the first lens (L1), the second lens (L2), and the third lens (L3) are all smaller than the outer diameter of the fifth lens (L5).
In a preferred embodiment, the first lens (L1), the second lens (L2), the third lens (L3), the fourth lens (L4) and the fifth lens (L5) are plastic lenses, and the 5P small mounting hole optical lens satisfies:
the first lens (L1): 1.51< Nd <1.58, 51.2< Vd < 57.9;
the second lens (L2): 1.61< Nd <1.69, 19.3< Vd < 27.8;
the third lens (L3): 1.61< Nd <1.69, 19.3< Vd < 27.8;
the fourth lens (L4): 1.49< Nd <1.56, 54.0< Vd < 57.9;
the fifth lens (L5): 1.49< Nd <1.56, 54.0< Vd < 57.9;
where Nd represents the refractive index of the lens and Vd represents the abbe number of the convex mirror.
In a preferred embodiment, a length between an intersection point of the object side surface (S2) of the first lens (L1) and the optical axis and a projection point of the effective diameter edge of the object side surface (S8) of the third lens (L4) on the optical axis is Ts2S8T, and a distance from the object side surface (S2) of the first lens (L1) to the imaging plane is TTL of an optical total length of the 5P small mount-hole optical lens, and the following conditions are also satisfied: 0.54< | Ts2s8T/TTL | < 0.63. The range is used for controlling the ratio range of the length of the front half part of the 5P small mounting hole optical lens to the whole length, and is beneficial to controlling the length of the front part while controlling the small-size mounting hole diameter.
In this preferred embodiment, the 5P small mounting hole optical lens optical total length TTL satisfies: 3.8mm < TTL <4.5 mm.
In the present embodiment, a length Ts2S8TR between an intersection point of the object side surface (S2) of the first lens (L1) and the optical axis and a projection point of the effective diameter edge of the object side surface (S8) of the fourth lens (L4) on the optical axis further satisfies: 2.2mm < Ts2s8T <2.9 mm.
In the present embodiment, the front group focal length f12 satisfies: 0.98< f12/TTL < 1.16. Satisfying this range, the aperture of the third lens (L3) can be controlled.
In a preferred embodiment, the first lens (L1), the second lens (L2), and the third lens (L3) have a combined focal length f13 that satisfies: 0.97< | f13/TTL | < 1.24. Satisfying this range is advantageous in that the light heights on the fourth lens (L4) and the fifth lens (L5) are controlled to be sufficiently large, so that sufficiently large image heights and CRAs can be matched.
Compared with the prior art, the invention has the beneficial effects that:
the invention relates to a 5P small mounting hole optical lens, which uses 5 lenses made of plastic materials, wherein the total focal power of a first lens is positive, and a light beam converges after being emitted, thereby being beneficial to controlling the outer diameter of a second lens; the total focal power of the first lens and the second lens is positive, and the light beam converges after being emitted from the second lens, so that the control of the outer diameter of the surface of the third lens is facilitated; the overall shape of the image space surface of the second lens is a concave surface, after light beams are emitted, the angle of a principal ray is enlarged, so that refraction through a rear lens is facilitated, a larger imaging range is obtained on a chip, meanwhile, the distribution proportion of the refractive power of f12 and f35 is reasonably controlled, the size of the front group of the 5P small-mounting-hole optical lens is facilitated to be controlled, the requirement of an electronic product on the small-size 5P small-mounting-hole optical lens is met, the size of the small mounting hole of the 5P small-mounting-hole optical lens is achieved, and the requirements of the larger size of the chip and the CRA are met.
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 some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a light fan diagram according to a first embodiment of the present invention.
Fig. 3 is a graph of MTF resolution according to the first embodiment of the present invention.
Fig. 4 is a diagram illustrating field curvature and distortion according to a first embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a second embodiment of the present invention.
FIG. 6 is a light fan diagram according to a second embodiment of the present invention.
FIG. 7 is a graph showing MTF resolution of a second embodiment of the present invention.
FIG. 8 is a graph showing curvature of field and distortion according to a second embodiment of the present invention.
FIG. 9 is a schematic diagram of a third structure of the embodiment of the invention.
FIG. 10 is a light fan diagram of a third embodiment of the present invention.
FIG. 11 is a graph showing MTF resolution of a third embodiment of the present invention.
FIG. 12 is a graph showing the field curvature and distortion of a third embodiment 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.
Fig. 1 is a schematic view showing a 5P small mount hole optical lens according to a first embodiment of the present invention. As shown in fig. 1, the 5P small aperture optical lens includes, in order from an object side to an Image side along an optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, an infrared filter IR, and an Image plane Image. The first lens is a positive lens, and at least one surface of the first lens is an aspheric surface; the second lens is a negative lens with a meniscus structure, wherein the convex surface of the negative lens faces the object side and the concave surface of the negative lens faces the image side, and at least one surface of the negative lens is an aspheric surface; the third lens is a meniscus-structured positive lens with a concave surface facing the object side and a convex surface facing the image side at the optical axis, and at least one surface of the third lens is an aspheric surface; the fourth lens is a positive lens with a concave surface facing the object side and a convex surface facing the image side, and at least one surface of the fourth lens is an aspheric surface; the fifth lens is a negative lens with a central concave surface on both the object side and the image side, and at least one surface of the fifth lens is an aspheric surface.
The stop (Sto) is disposed at an effective diameter edge of a first surface (S2) of the first lens (L1), the stop (Sto) having a surface S1; a first lens L1 having a first surface S2 with a convex surface facing the object side and a second surface S3 with a concave surface facing the image side; a second lens L2 having a first surface S4 with a convex surface facing the object side and a second surface S5 with a concave surface facing the image side; a third lens L3 having a first surface S6 generally concave toward the object side and a second surface S7 generally convex toward the image side; a fourth lens L4 having a first surface S8 with a concave surface facing the object side and a second surface S9 with a convex surface facing the image side; a fifth lens L5 having a first surface S10 with a central region concave facing the object side and a second surface S11 with a central region concave facing the image side; the infrared filter IR has a first surface S12 facing the object side and a second surface S13 facing the image side for filtering infrared light; the Image plane Image has a surface S14. Lens data of the above lens are shown in table 1 below.
[ TABLE 1 ]
The conic coefficients k and the aspherical coefficients a4-a20 of the first surface S2 and the second surface S3 of the first lens L1, the first surface S4 and the second surface S5 of the second lens L2, the first surface S6 and the second surface S7 of the third lens L3, the first surface S8 and the second surface S9 of the fourth lens L4, and the first surface S10 and the second surface S11 of the fifth lens L5 are as shown in table 2 below.
[ TABLE 2 ]
| Surface number | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 |
| Surface name | L1S1 | L1S2 | L2S1 | L2S2 | L3S1 | L3S2 | L4S1 | L4S2 | L5S1 | L5S2 |
| R＝ | 1.376E+00 | 1.446E+01 | 7.024E+00 | 2.312E+00 | 1.388E+01 | 1.199E+01 | -1.341E+01 | -1.118E+00 | -8.756E+01 | 1.031E+00 |
| k＝ | -2.854E-02 | -5.092E+00 | 0 | -4.511E+01 | 1.937E+02 | 0 | -3.189E+01 | -5.492E+00 | 4.062E+00 | -6.527E+00 |
| A4＝ | -7.257E-03 | -2.894E-01 | -3.666E-01 | 3.195E-01 | -2.169E-01 | -1.421E-01 | 3.041E-02 | -1.177E-01 | -3.182E-01 | -1.991E-01 |
| A5＝ | ||||||||||
| A6＝ | 8.468E-02 | 1.060E+00 | 1.368E+00 | -7.217E-01 | 1.173E-01 | -5.173E-02 | -1.207E-01 | 1.236E-01 | 1.626E-01 | 1.474E-01 |
| A7＝ | ||||||||||
| A8＝ | -3.196E-01 | -2.353E+00 | -3.073E+00 | 1.733E+00 | -3.289E-01 | 2.271E-01 | 1.164E-01 | -1.742E-01 | -2.708E-02 | -8.167E-02 |
| A9＝ | ||||||||||
| A10＝ | 7.310E-01 | 3.744E+00 | 5.167E+00 | -1.087E+00 | 5.963E-01 | -3.081E-01 | -3.454E-02 | 1.882E-01 | 4.404E-04 | 3.180E-02 |
| A11＝ | ||||||||||
| A12＝ | -1.023E+00 | -4.015E+00 | -5.906E+00 | -3.595E+00 | -4.133E-01 | 2.632E-01 | -6.984E-03 | -9.622E-02 | 6.041E-05 | -8.319E-03 |
| A13＝ | ||||||||||
| A14＝ | 7.935E-01 | 2.528E+00 | 3.870E+00 | 7.825E+00 | 0 | -9.380E-02 | 5.803E-03 | 2.257E-02 | 5.183E-05 | 1.361E-03 |
| A15＝ | ||||||||||
| A16＝ | -2.568E-01 | -7.078E-01 | -1.088E+00 | -4.778E+00 | 0 | 2.140E-03 | -8.508E-04 | -1.987E-03 | -5.875E-06 | -1.229E-04 |
| A17＝ | ||||||||||
| A18＝ | 4.599E-06 | |||||||||
| A19＝ | ||||||||||
| A20＝ | 0 |
In this embodiment, the first lens (L1) and the second lens (L2) are combined into a front group having a focal length of f 12; the third lens (L3), the fourth lens (L4) and the fifth lens (L5) are combined to form a rear group, the focal length of the rear group is f35, the optical effective half aperture of the first lens (L1) is SD1, the effective focal length of the lens is EFL, and the 5P small mounting hole optical lens further meets the following conditions: 0.02< | f12/f35| < 0.35; and 0.20< SD1/EFL < 0.32.
By reasonably controlling the distribution ratio of the refractive power of the f12 and the f35, and making the comprehensive focal length (f12) of the front group be a positive focal length and have a small proportion, the control of the chief ray angle to the third lens (L3) is facilitated. By controlling the ratio of the optical effective half aperture of the first lens (L1) to SD1 to the effective focal length of the 5P small-mounting-hole optical lens to EFL, the effective diameter of the lens in the front of the 5P small-mounting-hole optical lens can be controlled to meet the requirement of the front small mounting hole of the lens.
In the present embodiment, the outer diameters of the first lens (L1), the second lens (L2), and the third lens (L3) are all smaller than the outer diameter of the fourth lens (L4), the outer diameters of the first lens (L1), the second lens (L2), and the third lens (L3) are all smaller than the outer diameter of the fifth lens (L5), and the outer diameters of the first three lenses are smaller than the outer diameters of the fourth lens (L4) and the fifth lens (L5). By controlling the relation among the sizes of the lenses, the rear part of the 5P small mounting hole optical lens meets the requirement of a large chip.
In the present embodiment, the first lens (L1), the second lens (L2), the third lens (L3), the fourth lens (L4), and the fifth lens (L5) are plastic lenses, and the 5P small mount hole optical lens satisfies:
the first lens (L1): 1.51< Nd <1.58, 51.2< Vd < 57.9;
the second lens (L2): 1.61< Nd <1.69, 19.3< Vd < 27.8;
the third lens (L3): 1.61< Nd <1.69, 19.3< Vd < 27.8;
the fourth lens (L4): 1.49< Nd <1.56, 54.0< Vd < 57.9;
the fifth lens (L5): 1.49< Nd <1.56, 54.0< Vd < 57.9;
where Nd represents the refractive index of the lens and Vd represents the abbe number of the convex mirror. And the chromatic dispersion of the lens is favorably controlled in the relational expression range, and the resolution is improved.
In this embodiment, the 5P small mounting hole optical lens optical total length TTL satisfies: 3.8mm < TTL <4.5 mm.
In the present embodiment, a length between an intersection point of the object side surface (S2) of the first lens (L1) and the optical axis and a projection point of the effective diameter edge of the object side surface (S8) of the fourth lens (L4) on the optical axis is Ts2S8T, and Ts2S8T satisfies: 2.2mm < Ts2s8T <2.9 mm.
In the present embodiment, the front group focal length f12 further satisfies: 0.98< f12/TTL < 1.16. Satisfying this range, the aperture of the third lens (L3) can be controlled.
In the present embodiment, the first lens (L1), the second lens (L2), and the third lens (L3) have a total focal length f13, and the total focal length f13 satisfies: 0.97< | f13/TTL | < 1.24. Satisfying this range is advantageous in that the light ray heights on the fourth lens (L4) and the fifth lens (L5) are controlled to be sufficiently large so as to match a sufficiently large image height and principal light angle CRA.
Specifically, in the embodiment, each physical quantity of the 5P small mount hole optical lens satisfies the parameters as in the following table 3:
[ TABLE 3 ]
| Ts2s8T＝2.53 | SD1＝0.951 |
| f12＝4.45 | f13＝4.51 |
| f35＝83.15 | f45＝48.89 |
| TTL＝4.24 | EFL＝3.575 |
| Ts2s8T/TTL＝0.596 | |f12/f35|＝0.053 |
| |f12/TTL|＝1.049 | MaxSD13/EFL＝0.287 |
| |f13/TTL|＝1.063 | TTL/EFL＝1.186 |
| Nd1＝1.545, | Vd1＝55.93 |
| Nd2＝1.64, | Vd2＝23.5 |
| Nd3＝1.64, | Vd3＝23.5 |
| Nd4＝1.535, | Vd4＝55.7 |
| Nd5＝1.535, | Vd5＝55.7 |
In the above embodiment:
as shown in fig. 2 (light sector), it can be seen that the spherical aberration has been corrected.
As shown in fig. 3 (MTF solution graph), the lens has better imaging effect and resolution as shown by the MTF curve.
As shown in fig. 4 (field curvature and distortion diagram), the field curvature is smaller as seen from the field curvature, which effectively improves the image definition.
Second embodiment:
fig. 5 is a schematic view showing a 5P small mount hole optical lens according to a second embodiment of the present invention. The second embodiment is substantially the same as the first embodiment except that: the radius of curvature, thickness, refractive index, abbe number of each lens were varied from those of the first embodiment.
Lens data of the above lenses are shown in table 4 below.
[ TABLE 4 ]
The conic coefficients k and the aspherical coefficients a4-a20 of the first surface S2 and the second surface S3 of the first lens L1, the first surface S4 and the second surface S5 of the second lens L2, the first surface S6 and the second surface S7 of the third lens L3, the first surface S8 and the second surface S9 of the fourth lens L4, and the first surface S10 and the second surface S11 of the fifth lens L5 are as shown in table 5 below.
[ TABLE 5 ]
| Surface number | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 |
| Surface name | L1S1 | L1S2 | L2S1 | L2S2 | L3S1 | L3S2 | L4S1 | L4S2 | L5S1 | L5S2 |
| R＝ | 1.651E+00 | 6.074E+01 | 1.229E+01 | 3.178E+00 | 1.244E+01 | 9.339E+00 | -6.470E+01 | -1.100E+00 | -8.342E+00 | 1.125E+00 |
| k＝ | -2.854E-02 | -5.092E+00 | 0 | -4.511E+01 | 1.937E+02 | 0 | -3.189E+01 | -5.492E+00 | 4.062E+00 | -6.527E+00 |
| A4＝ | -8.588E-03 | -2.615E-01 | -3.696E-01 | -3.563E-02 | -3.032E-01 | -2.146E-01 | 7.875E-03 | -1.511E-01 | -2.172E-01 | -1.616E-01 |
| A5＝ | ||||||||||
| A6＝ | 1.463E-02 | 8.969E-01 | 1.442E+00 | 5.597E-01 | 2.155E-01 | 5.468E-02 | -6.265E-02 | 2.031E-01 | 1.082E-01 | 1.205E-01 |
| A7＝ | ||||||||||
| A8＝ | -1.485E-01 | -2.027E+00 | -3.179E+00 | -1.511E+00 | -5.164E-01 | 2.314E-02 | 8.451E-02 | -2.111E-01 | -1.502E-02 | -7.028E-02 |
| A9＝ | ||||||||||
| A10＝ | 4.928E-01 | 3.326E+00 | 4.967E+00 | 2.382E+00 | 8.192E-01 | -9.149E-02 | -5.352E-02 | 1.830E-01 | -2.838E-04 | 2.906E-02 |
| A11＝ | ||||||||||
| A12＝ | -8.861E-01 | -3.984E+00 | -5.535E+00 | -1.696E+00 | -4.666E-01 | 1.782E-01 | 1.148E-02 | -9.062E-02 | -1.420E-05 | -7.979E-03 |
| A13＝ | ||||||||||
| A14＝ | 7.761E-01 | 2.902E+00 | 3.886E+00 | 1.035E-03 | 0 | -1.036E-01 | 1.578E-03 | 2.193E-02 | 5.144E-05 | 1.352E-03 |
| A15＝ | ||||||||||
| A16＝ | -2.692E-01 | -9.684E-01 | -1.382E+00 | 1.943E-01 | 0 | 2.741E-02 | -6.232E-04 | -2.031E-03 | -4.529E-06 | -1.259E-04 |
| A17＝ | ||||||||||
| A18＝ | 4.876E-06 | |||||||||
| A19＝ | ||||||||||
| A20＝ | 0 |
Specifically, in the embodiment, each physical quantity of the 5P small mount hole optical lens satisfies the parameters as in the following table 6:
[ TABLE 6 ]
| Ts2s8T＝2.655 | SD1＝1.009 |
| f12＝4.85 | f13＝5.1 |
| f35＝24.43 | f45＝16.14 |
| TTL＝4.45 | EFL＝3.575 |
| Ts2s8T/TTL＝0.596 | |f12/f35＝0.198 |
| |f12/TTL|＝1.089 | MaxSD13/EFL＝0.282 |
| |f13/TTL|＝1.146 | TTL/EFL＝1.244 |
| Nd1＝1.545, | Vd1＝55.93 |
| Nd2＝1.651, | Vd2＝21.5 |
| Nd3＝1.651, | Vd3＝23.5 |
| Nd4＝1.535, | Vd4＝55.7 |
| Nd5＝1.535, | Vd5＝55.7 |
In the above embodiment:
as shown in fig. 6 (light sector), it can be seen that the spherical aberration has been corrected.
As shown in fig. 7 (MTF solution graph), the lens has better imaging effect and resolution as shown by the MTF curve.
As shown in fig. 8 (field curvature and distortion diagram), the field curvature is smaller as seen from the field curvature, which effectively improves the image definition.
The third embodiment:
fig. 9 is a schematic view showing a 5P small mount hole optical lens according to a third embodiment of the present invention. The third embodiment is substantially the same as the first embodiment except that: the radius of curvature, thickness, refractive index, abbe number of each lens were varied from those of the first embodiment.
The characteristic data of each lens described above is shown in table 7 below.
[ TABLE 7 ]
The conic coefficients k and the aspherical coefficients a4-a20 of the first surface S2 and the second surface S3 of the first lens L1, the first surface S4 and the second surface S5 of the second lens L2, the first surface S6 and the second surface S7 of the third lens L3, the first surface S8 and the second surface S9 of the fourth lens L4, and the first surface S10 and the second surface S11 of the fifth lens L5 are as shown in table 8 below.
[ TABLE 8 ]
| Surface number | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 |
| Surface name | L1S1 | L1S2 | L2S1 | L2S2 | L3S1 | L3S2 | L4S1 | L4S2 | L5S1 | L5S2 |
| R＝ | 1.534E+00 | 4.068E+01 | 1.246E+01 | 3.143E+00 | 1.323E+01 | 1.017E+01 | -1.424E+01 | -1.102E+00 | -9.737E+00 | 1.120E+00 |
| k＝ | -2.854E-02 | -5.092E+00 | 0 | -4.511E+01 | 1.937E+02 | 0 | -3.189E+01 | -5.492E+00 | 4.062E+00 | -6.527E+00 |
| A4＝ | -7.980E-03 | -2.682E-01 | -3.738E-01 | -2.313E-02 | -3.061E-01 | -2.154E-01 | 6.619E-03 | -1.409E-01 | -2.146E-01 | -1.627E-01 |
| A5＝ | ||||||||||
| A6＝ | 1.304E-02 | 8.985E-01 | 1.446E+00 | 5.245E-01 | 2.087E-01 | 4.672E-02 | -6.786E-02 | 2.011E-01 | 1.107E-01 | 1.204E-01 |
| A7＝ | ||||||||||
| A8＝ | -1.514E-01 | -2.026E+00 | -3.167E+00 | -1.471E+00 | -5.532E-01 | 5.587E-02 | 8.259E-02 | -2.090E-01 | -1.707E-02 | -7.021E-02 |
| A9＝ | ||||||||||
| A10＝ | 4.887E-01 | 3.335E+00 | 4.980E+00 | 2.460E+00 | 9.434E-01 | -1.643E-01 | -5.415E-02 | 1.799E-01 | -1.029E-04 | 2.904E-02 |
| A11＝ | ||||||||||
| A12＝ | -8.881E-01 | -3.983E+00 | -5.517E+00 | -1.820E+00 | -5.155E-01 | 3.027E-01 | 1.444E-02 | -9.020E-02 | 2.649E-05 | -7.989E-03 |
| A13＝ | ||||||||||
| A14＝ | 7.750E-01 | 2.895E+00 | 3.915E+00 | 3.559E-02 | 0 | -1.314E-01 | 9.379E-04 | 2.221E-02 | 5.500E-05 | 1.355E-03 |
| A15＝ | ||||||||||
| A16＝ | -2.715E-01 | -9.551E-01 | -1.397E+00 | 2.508E-01 | 0 | 1.670E-03 | -6.968E-04 | -2.095E-03 | -6.325E-06 | -1.259E-04 |
| A17＝ | ||||||||||
| A18＝ | 4.834E-06 | |||||||||
| A19＝ | ||||||||||
| A20＝ | 0 |
Specifically, in the embodiment, each physical quantity of the 5P small mount hole optical lens satisfies the parameters as in the following table 9:
[ TABLE 9 ]
| Ts2s8T＝2.487 | SD1＝0.986 |
| f12＝4.45 | f13＝4.6 |
| f35＝76.63 | f45＝32.53 |
| TTL＝4.3 | EFL＝3.51 |
| Ts2s8T/TTL＝0.578 | |f12/f35|＝0.058 |
| |f12/TTL|＝1.034 | MaxSD13/EFL＝0.28 |
| |f13/TTL|＝1.069 | TTL/EFL＝1.225 |
| Nd1＝1.545, | Vd1＝55.93 |
| Nd2＝1.651, | Vd2＝21.5 |
| Nd3＝1.651, | Vd3＝21.5 |
| Nd4＝1.535, | Vd4＝55.7 |
| Nd5＝1.535, | Vd5＝55.7 |
In the above embodiment:
as shown in fig. 10 (light sector), it can be seen that the spherical aberration has been corrected.
As shown in fig. 11 (MTF solution graph), the lens has better imaging effect and resolution as shown by the MTF curve.
As shown in fig. 12 (field curvature and distortion diagram), the field curvature is smaller as seen from the field curvature, which effectively improves the image definition.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A 5P small mount aperture optical lens, comprising: a first lens (L1), a second lens (L2), a third lens (L3), a fourth lens (L4), a fifth lens (L5), and an imaging surface, which are arranged in this order from the object side to the image side along the optical axis; the first lens (L1) is a positive lens, and at least one surface of the first lens is an aspheric surface; the second lens (L2) is a negative lens with a meniscus structure, wherein the convex surface of the negative lens faces the object side and the concave surface of the negative lens faces the image side, and at least one surface of the negative lens is aspheric; the third lens (L3) is a positive lens with a meniscus structure, wherein the concave surface of the positive lens faces the object side and the convex surface of the positive lens faces the image side, and at least one surface of the positive lens is an aspheric surface; the fourth lens (L4) is a positive lens with a concave surface facing the object side and a convex surface facing the image side, and at least one surface of the fourth lens is aspheric; the fifth lens (L5) is a negative lens with concave centers on both the object side and the image side, and at least one surface of the fifth lens is aspheric; characterized in that the first lens (L1) and the second lens (L2) are combined into a front group, the front group focal length is f 12; the third lens (L3), the fourth lens (L4) and the fifth lens (L5) are combined to form a rear group, the focal length of the rear group is f35, the optical effective half aperture of the first lens (L1) is SD1, the effective focal length of the lens is EFL, and the 5P small mounting hole optical lens meets the following conditions: 0.02< | f12/f35| < 0.35; and 0.20< SD1/EFL < 0.32;
the length between the intersection point of the object side surface (S2) of the first lens (L1) and the optical axis and the projection point of the effective diameter edge of the object side surface (S8) of the fourth lens (L4) on the optical axis is Ts2S8T, and Ts2S8T satisfies: 2.2mm < Ts2s8T <2.9 mm;
the optical total length TTL of the 5P small mounting hole optical lens meets the following requirements: 3.8mm < TTL <4.5 mm.
2. A 5P small mount aperture optical lens according to claim 1, further comprising an aperture disposed at an object side of the first lens (L1), or at an effective diameter edge of the first surface (S2) of the first lens (L1), or in front of the first surface (S2) of the first lens (L1).
3. A 5P small mount aperture optical lens according to claim 1, wherein the outer diameter of the first lens (L1), the outer diameter of the second lens (L2), and the outer diameter of the third lens (L3) are all smaller than the outer diameter of the fourth lens (L4).
4. A 5P small mount aperture optical lens according to claim 1, wherein the first lens (L1), the second lens (L2), and the third lens (L3) each have an outer diameter smaller than that of the fifth lens (L5).
5. The 5P small mounting hole optical lens of claim 1, wherein the first lens (L1), the second lens (L2), the third lens (L3), the fourth lens (L4) and the fifth lens (L5) are plastic lenses, and the 5P small mounting hole optical lens satisfies the following conditions:
the first lens (L1): 1.51< Nd <1.58, 51.2< Vd < 57.9;
the second lens (L2): 1.61< Nd <1.69, 19.3< Vd < 27.8;
the third lens (L3): 1.61< Nd <1.69, 19.3< Vd < 27.8;
the fourth lens (L4): 1.49< Nd <1.56, 54.0< Vd < 57.9;
the fifth lens (L5): 1.49< Nd <1.56, 54.0< Vd < 57.9;
where Nd represents the refractive index of the lens and Vd represents the abbe number of the convex mirror.
6. A 5P small mount aperture optical lens as claimed in claim 1, wherein the distance from the object side surface (S2) of the first lens (L1) to the image plane is 5P small mount aperture optical lens optical total length TTL, and the 5P small mount aperture optical lens further satisfies the following condition: 0.54< | Ts2s8T/TTL | < 0.63.
7. A 5P small aperture optical lens according to claim 6, wherein the front group focal length f12 further satisfies: 0.98< f12/TTL < 1.16.
8. A5P small mounting hole optical lens according to claim 6, characterized in that the first lens (L1), the second lens (L2) and the third lens (L3) have a combined focal length f13, and the combined focal length f13 satisfies: 0.97< | f13/TTL | < 1.24.
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Denomination of invention: A 5P small mounting hole optical lens Effective date of registration: 20230321 Granted publication date: 20220415 Pledgee: Agricultural Bank of China Limited Zhijiang sub branch Pledgor: HUBEI HUAXIN PHOTOELECTRIC Co.,Ltd. Registration number: Y2023980035533 |
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Denomination of invention: A 5P small mounting hole optical lens Granted publication date: 20220415 Pledgee: Agricultural Bank of China Limited Zhijiang sub branch Pledgor: HUBEI HUAXIN PHOTOELECTRIC Co.,Ltd. Registration number: Y2024980009263 |