CN108594403A - Optical lens - Google Patents
Optical lens Download PDFInfo
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- CN108594403A CN108594403A CN201810425265.4A CN201810425265A CN108594403A CN 108594403 A CN108594403 A CN 108594403A CN 201810425265 A CN201810425265 A CN 201810425265A CN 108594403 A CN108594403 A CN 108594403A
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Abstract
The invention discloses a kind of optical lens, include sequentially from object side to image side:One the first lens, second lens with negative diopter with negative diopter, there are the 5th lens of negative diopter, the thickness of the third lens to be more than 3 millimeters for one the third lens with positive diopter, one the 4th lens and one with positive diopter, second lens have an Abbe number vd2, and 10<vd2<50, optical lens meets Y '/FL>1.12 and/or TTL/Y '<6.1, wherein Y ' are the focal length that the image half of optical lens is high, FL is optical lens and TTL is distance from the object side of the first lens to an imaging surface.
Description
The application be the applying date be on 08 29th, 2014, application No. is 201410436387.5, entitled " optics
The divisional application of the application for a patent for invention of camera lens ".
Technical field
The present invention relates to a kind of optical lens, and more particularly to a kind of wide-angle and the good optical lens of image quality.
Background technology
Existing camera system includes mainly optical lens and image sensing module.Wherein, optical lens can be by light beam
It converges on image sensing module, and the light beam of convergence is converted to the electronic signal of image by image sensing module, in order to rear
It is continuous that image is stored again, handled and is transmitted.
The optical lens of camera system is typically to be made of several pieces eyeglasses, in order to increase competitive advantage in the market, wide-angle,
High image quality and to reduce cost be always the target to be pursued of product development.
Therefore, there is an urgent need for proposing a kind of new optical lens, under the premise of reducing manufacturing cost, while optical lens is realized
Wide-angle and the purpose for promoting image quality.
Invention content
The purpose of the present invention is to provide a kind of optical lens.Under the premise of good image quality is provided, while can
Realize the optical lens of wide-angle.
According to an embodiment of the content of present invention, a kind of optical lens is proposed.Optical lens is sequentially wrapped from object side to image side
It includes:One the first lens, second lens with negative diopter with negative diopter, a third with positive diopter are saturating
There are the 5th lens of negative diopter, the thickness of wherein the third lens to be more than for mirror, one the 4th lens and one with positive diopter
3 millimeters (mm), the second lens have Abbe number vd2, and 10<vd2<50.
Below in conjunction with the drawings and specific embodiments, the present invention will be described in detail, but not as a limitation of the invention.
Description of the drawings
Fig. 1 is painted the optical lens of the embodiment according to the content of present invention;
Fig. 2 is painted the curvature of field (field curvature) curve of the optical lens of the embodiment according to the content of present invention
Figure;
Fig. 3 is painted distortion (distortion) curve graph of the optical lens of the embodiment according to the content of present invention;
The lateral chromatic aberration (lateral color) that Fig. 4 is painted the optical lens of the embodiment according to the content of present invention is bent
Line chart;
Fig. 5 is painted the relative luminance (relative of the optical lens of the embodiment according to the content of present invention
Illumination) curve graph;
Fig. 6 is painted modulation transfer function (the modulus of of the optical lens of the embodiment according to the content of present invention
The OTF) curve graph;
Fig. 7 is painted the optical lens of another embodiment according to the content of present invention;
Fig. 8 is painted the curvature of field curve graph of the optical lens of another embodiment according to the content of present invention;
Fig. 9 is painted the distortion curve figure of the optical lens of another embodiment according to the content of present invention;
Figure 10 is painted the lateral chromatic aberration curve graph of the optical lens of another embodiment according to the content of present invention;
Figure 11 is painted the relative luminance curve figure of the optical lens of another embodiment according to the content of present invention;
Figure 12 is painted the modulation transfer function curve graph of the optical lens of another embodiment according to the content of present invention.
Specific implementation mode
It will be described each embodiment of the content of present invention below, and coordinate attached drawing as illustration.In addition to it is described in detail in these
Outside, the present invention can also widely implement in other examples, the replacement easily of any embodiment, modification, equivalent
Variation is included within the scope of the invention, and is subject to right later.In the description of specification, in order to make
Reader has more complete understanding to the present invention, provides many specific details;However, the present invention may be in clipped or whole
Under the premise of these specific details, can still it implement.Moreover, it is well known that the step of or element be not described in details, to keep away
Exempt to cause the unnecessary limitation of the present invention.Same or similar element will be indicated with same or like symbol in attached drawing.Especially
It is used it is noted that attached drawing is only signal, not the actual size of representation element or quantity, unless otherwise specified.
Fig. 1 is painted the optical lens OL1 of the embodiment according to the content of present invention.To show the feature of the present embodiment, only
Display structure related with the present embodiment, remaining structure are omitted.The optical lens OL1 of the present embodiment can be one with wide
Angle level is more than the wide-angle lens of 180 degree, can be applied to handheld communication system, digital camera, digital code camera, steam turbine
On vehicle, monitor or telecontrol equipment.In addition, the optical lens OL1 of the present embodiment can also be a tight shot.
As shown in Figure 1, the optical lens OL1 of the present embodiment is from object side (object side) to image side (image-
Forming side) include mainly sequentially:One the first lens L1, second lens with negative diopter with negative diopter
L2, the third lens L3, the 4th lens L4 and one with positive diopter with positive diopter have the of negative diopter
Five lens L5.
In a specific embodiment, the second lens L2 has Abbe number vd2, and vd2 meets vd2<50 condition, but not with
This is limited.
In another embodiment, the Abbe number vd2 of the second lens L2 can meet 10<vd2<50;And in another embodiment, the
The Abbe number vd2 of two lens L2 then substantially meets 20<vd2<30.
In addition, the second lens L2 also has refractive index nd2.In a specific embodiment, nd2 can meet nd2>1.6 item
Part;In another embodiment, nd2 can also meet 2.2>nd2>1.6.
Furthermore in still another embodiment, the third lens L3 has refractive index nd3, and nd3 can meet nd3>1.8
Condition.In another embodiment, nd3 can also meet 2.2>nd2>1.8.
Further, in an embodiment, the thickness of the third lens L3 can be more than 3 millimeters (millimeter, mm).In another
In one embodiment, the thickness of the third lens L3 can be between 3 millimeters and 6 millimeters.
Furthermore in another embodiment, the 5th lens L5 has refractive index nd5, and nd5 can meet nd5>1.9 condition.
In another embodiment, nd5 can also meet 2.2>nd5>1.9.
On the other hand, in another embodiment, the 5th lens L5 can be used high dispersion (dispersion) material make and
At.Specifically, the 5th lens L5 also has Abbe number vd5, and vd5 can meet 15<vd5<25 condition.
As shown in Figure 1, specifically, optical lens OL1 more may include an a diaphragm St and optical filter F.Diaphragm St can be set
It is placed between the second lens L2 and the third lens L3, contributes to the luminous flux for limiting light beam;Optical filter F may be disposed at the 5th lens
Between L5 and imaging surface I, help to filter out the noise in light beam, wherein optical filter F can be an infrared light optical filter (IR
Filter).In addition, in image acquisition unit of the setting one with photoelectric converting function on imaging surface I, can receive across optical filtering
The light beam of piece F, and convert optical signals to electric signal.And between imaging surface I and optical filter F, still there is plate glass C as shadow
As the protective glass (cover glass) of acquisition unit.
Furthermore optical lens OL1 can also meet TTL<16 millimeters of condition.Wherein, TTL is from the object side of the first lens L1
To the distance of an imaging surface I.Specifically, TTL be from the vertex of the first surface of the first lens L1 to an imaging surface I away from
From.Wherein, first surface is equal to the surface code name S1 of table one and table three.
In addition, optical lens OL1 can also meet TTL/Y '<6.1 condition.Wherein, Y ' is the image half of optical lens OL1
It is high.
Also, optical lens OL1 can also meet Y '/FL>1.12 condition.Wherein, FL is the focal length of optical lens OL1
(focal length)。
On the other hand, optical lens OL1 can also meet the FOV=(conditions of)≤135 ° 2 × ω (degree).Wherein, ω
Corresponding Y ' maximum values, i.e. maxY ', when half-field angle (half field of view).In one specific embodiment, 210 °≤
()≤135 ° 2 × ω FOV=.
Further, optical lens OL1 can also meet Fno<2.4 condition.Wherein, Fno is the aperture of optical lens OL1
Coefficient.In one specific embodiment, the aperture-coefficient of optical lens OL1 can meet 1.8<Fno<2.4.
Furthermore in another embodiment, the aperture system of optical lens OL1 uses the design of constant aperture.
In an embodiment, the first lens L1, the second lens L2, the third lens L3, the 4th lens L4 of optical lens OL1
And the 5th at least one of lens L5 can be a non-spherical lens and/or a free-form surface lens.Wherein, non-spherical lens has
At least a surface is aspherical, and an at least surface for free-form surface lens is free form surface.
In this present embodiment, the first lens L1, the third lens L3, the 4th lens L4 and the 5th lens L5 can be that spherical surface is saturating
Mirror, the second lens L2 can be non-spherical lens and have an at least non-spherical surface.Specifically, the second lens L2's is aspherical
Surface can meet following mathematical expression:
Wherein Z is the coordinate values in the directions optical axis OA, and using optical transmission direction as positive direction, A4, A6, A8 and A10 are aspheric
Face coefficient, K are quadratic surface constant, and C=1/R, R are radius of curvature, and Y is the coordinate values for being orthogonal to the directions optical axis OA, with top
For positive direction.In addition, the parameters of the aspherical mathematical expression of non-spherical lens or the value of coefficient can be set separately, it is non-to determine
The focal length of spherical lens.
In another embodiment, the second lens L2 can be free-form surface lens, and wherein free-form surface lens have at least one
Free form surface surface.Specifically, the second lens L2 can be free-form surface lens or non-spherical lens.Alternatively, the second lens L2
Can have a non-spherical surface and a free form surface surface simultaneously, and be not limited.
In addition, in the present embodiment, glass can be used in the first lens L1, the third lens L3, the 4th lens L4 and the 5th lens L5
Glass lens made by glass material, and the plastic lens made by plastic material can be used in the material of the second lens L2, wherein
Plastic cement material may include, but be not limited to, polycarbonate (polycarbonate), cyclic olefine copolymer (such as APEL), and
Polyester resin (such as OKP4 or OKP4HT) etc., or be the mixing material of at least one for including aforementioned three, but not as
Limit, in another embodiment, the first lens L1, the second lens L2, the third lens L3, the 4th lens L4 and the 5th lens L5 can be equal
Using glass lens.
As shown in Figure 1, the first lens L1 is the meniscus towards object side for convex surface, the second lens L2 is for convex surface towards object side
Meniscus, the third lens L3 is for biconvex lens, and the 4th lens L4 is for biconvex lens, and the 5th lens L5 is for convex surface court
The concave-convex lens of image side.
In embodiment, as shown in Figure 1, the 4th lens L4 and the 5th lens L5 can compose a balsaming lens.
In some embodiments, as shown in Figure 1, the first lens L1, the second lens L2, the third lens L3, the 4th lens L4
And the 5th lens L5 can be respectively along the optical axis OA movement of optical lens OL1.
Table one lists the detailed data of an embodiment of the optical lens OL1 according to the content of present invention such as Fig. 1 comprising each
Radius of curvature, thickness, refractive index, abbe number of lens etc..The surface code name of wherein eyeglass is sequentially compiled from object side to image side
Row, such as:" S1 " represents the first lens L1 towards the surface of object side, and " S2 " represents the first lens L1 and represented towards the surface of image side, " S "
Diaphragm surface, " S12 " and " S13 " respectively represent object side surface and the image side surface of optical filter F, and the object side of plate glass C and
Image side surface is " S14 " and " S15 " etc. respectively.In addition, " thickness " represents the surface at a distance from adjacent to one surface of image side,
For example, " thickness " of surface S1 is surface S1 with the S2 of surface at a distance from, " thickness " of surface S2 be surface S2 and surface S3 away from
From.
Table one
In addition, two surfaces of the second lens L2 in above-described embodiment, that is, surface code name is " S3 " and " S4 " person,
Each term coefficient in aspherical mathematical expression is as shown in Table 2.
Table two
K | A4 | A6 | A8 | A10 | |
S3 | 0 | -2.6192748E-04 | 7.1600248E-05 | -3.1777018E-05 | -4.3788000E-05 |
S4 | 0 | 9.0668609E-03 | 1.2372975E-04 | -1.4888306E-03 | 7.3356400E-04 |
The curvature of field (field curvature) that Fig. 2 is painted the optical lens OL1 of the embodiment according to the content of present invention is bent
Line chart.Wherein, curve T, S shows optical lens OL1 for tangent light beam (Tangential Rays) and sagittal beam respectively
The aberration of (Sagittal Rays).Show that wavelength is the tangent curvature of field value and arc of the light beam of 486nm, 588nm and 656nm in figure
Vector field song value controls in good range.
Fig. 3 is painted distortion (distortion) curve graph of the optical lens OL1 of the embodiment according to the content of present invention.
Show that wavelength is that the aberration rate of the light beam of 486nm, 588nm and 656nm controls in (- 120% ,+0%) range in figure.
Fig. 4 is painted the lateral chromatic aberration (lateral color) of the optical lens OL1 of the embodiment according to the content of present invention
Curve graph, wherein display aberration is can be controlled in (- 1.2 μm, 3.1 μm) range.
Fig. 5 is painted the relative luminance (relative of the optical lens OL1 of the embodiment according to the content of present invention
Illumination) curve graph, Fig. 6 are painted the modulation conversion letter of the optical lens OL1 of the embodiment according to the content of present invention
Number (modulus of the OTF) curve graph.
Can be seen that by Fig. 2~Fig. 6, the curvature of field of the optical lens OL1 of the present embodiment, distortion, lateral chromatic aberration, relative luminance and
Modulation transfer function can obtain well-corrected.
Fig. 7 is painted the optical lens OL2 of another embodiment according to the content of present invention.The optical lens OL2 of the present embodiment
Structure, roughly the same with the optical lens OL1 of embodiment shown in FIG. 1, main difference is in constituting the second lens L2
Material and characteristic be different and the difference of radius of curvature, thickness, refractive index, the abbe number of each lens etc..It is said below with example
Bright not exist together, previous explanation can be continued to use by mutually existing together, and be repeated no more.
In this present embodiment, the first lens L1 of optical lens OL2, the second lens L2, the third lens L3, the 4th lens L4
And the 5th lens L5 can be spherical lens.
On the other hand, the first lens L1 of optical lens OL2, the second lens L2, the third lens L3, the 4th lens L4 and
Five lens L5 can be the glass lens made by glass material.
Table three lists the detailed data according to the content of present invention such as embodiment of the optical lens OL2 of the 7th figure comprising
Radius of curvature, thickness, refractive index, abbe number of each lens etc..Wherein each code name is identical as previous embodiment, no longer in this
It repeats.
Table three
Fig. 8 is painted the curvature of field curve graph of the optical lens OL2 of the embodiment according to the content of present invention.Wherein, curve T, S
Aberrations of the optical lens OL2 for tangent light beam and sagittal beam is shown respectively.Shown in figure wavelength be 486nm, 588nm and
The tangent curvature of field value of the light beam of 656nm is controlled with Sagittal field curvature value in good range.
Fig. 9 is painted the distortion curve figure of the optical lens OL2 of the embodiment according to the content of present invention.Wavelength is shown in figure
It is controlled in (- 120% ,+0%) range for the aberration rate of the light beam of 486nm, 588nm and 656nm.
Figure 10 is painted the lateral chromatic aberration curve graph of the optical lens OL2 of the embodiment according to the content of present invention, wherein aobvious
Show that aberration is can be controlled in (- 0.9 μm, 2.3 μm) range.
Figure 11 is painted the relative luminance curve figure of the optical lens OL2 of the embodiment according to the content of present invention, Tu12Hui
Show the modulation transfer function curve graph of the optical lens OL2 of the embodiment according to the content of present invention.
It can be seen that by Fig. 8~Figure 12, the curvature of field of the optical lens OL2 of the present embodiment, distortion, lateral chromatic aberration, relative luminance
And modulation transfer function can obtain well-corrected.
Certainly, the present invention can also have other various embodiments, without deviating from the spirit and substance of the present invention, ripe
It knows those skilled in the art and makes various corresponding change and deformations, but these corresponding changes and change in accordance with the present invention
Shape should all belong to the protection domain of appended claims of the invention.
Claims (12)
1. a kind of optical lens, which is characterized in that include sequentially from object side to image side:One there is negative diopter the first lens,
One has the second lens of negative diopter, the 4th lens with positive diopter of the third lens with positive diopter, one and
One there are the 5th lens of negative diopter, the wherein thickness of the third lens to be more than 3 millimeters, which has Abbe number
Vd2,10<vd2<50, and the optical lens also meets Y '/FL>1.12 and/or TTL/Y '<6.1, wherein Y ' are the optical lens
Image half is high, focal length that FL is the optical lens and TTL are distances from the object side of first lens to an imaging surface.
2. optical lens according to claim 1, which is characterized in that second lens have refractive index nd2, and nd2>
1.6。
3. optical lens according to claim 1, which is characterized in that second lens are that a spherical lens or one are aspherical
Lens.
4. optical lens according to claim 1, which is characterized in that the third lens are that a biconvex lens or a spherical surface are saturating
Mirror.
5. optical lens according to claim 1, which is characterized in that the third lens have refractive index nd3, and nd3>
1.8。
6. optical lens according to claim 1, which is characterized in that the 5th lens have Abbe number vd5 and refractive index
Nd5, and 15<vd5<25 and/or nd5>1.9.
7. optical lens according to claim 1, which is characterized in that the 4th lens and the 5th lens compose a glue
Close lens.
8. optical lens according to claim 1, which is characterized in that the optical lens also meets the following conditions:TTL<16
Millimeter, distances of the wherein TTL from the object side of first lens to an imaging surface.
9. optical lens according to claim 1, which is characterized in that the optical lens also meets the following conditions:Fno<
2.4, wherein Fno are the aperture-coefficients of the optical lens.
10. optical lens according to claim 1, which is characterized in that the optical lens also meets the following conditions:(2×
ω)≤135 °, wherein ω is Y ' when being maximum value half-field angle, Y ' are that the image half of the optical lens is high.
11. optical lens according to claim 1, which is characterized in that the optical lens further includes a diaphragm, is set to this
Between second lens and the third lens.
12. optical lens according to claim 1, which is characterized in that first lens, the third lens, the 4th are thoroughly
Mirror and the 5th lens are glass lens, which is a plastic lens or a glass lens.
Priority Applications (1)
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CN201810425265.4A CN108594403A (en) | 2014-08-29 | 2014-08-29 | Optical lens |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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CN201410436387.5A CN105445909B (en) | 2014-08-29 | 2014-08-29 | Optical lens |
CN201810425265.4A CN108594403A (en) | 2014-08-29 | 2014-08-29 | Optical lens |
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CN201410436387.5A Division CN105445909B (en) | 2014-08-29 | 2014-08-29 | Optical lens |
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CN201810425265.4A Pending CN108594403A (en) | 2014-08-29 | 2014-08-29 | Optical lens |
CN201410436387.5A Active CN105445909B (en) | 2014-08-29 | 2014-08-29 | Optical lens |
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CN201410436387.5A Active CN105445909B (en) | 2014-08-29 | 2014-08-29 | Optical lens |
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Cited By (1)
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---|---|---|---|---|
CN110297317A (en) * | 2019-07-03 | 2019-10-01 | 江西联益光学有限公司 | A kind of imaging lens |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN107065144B (en) * | 2017-06-21 | 2023-04-14 | 华勤技术股份有限公司 | Wide-angle lens |
CN111239963B (en) * | 2018-11-29 | 2022-02-15 | 宁波舜宇车载光学技术有限公司 | Optical lens and imaging apparatus |
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JP3365835B2 (en) * | 1993-10-22 | 2003-01-14 | オリンパス光学工業株式会社 | Compact 3-group zoom lens |
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US5541773A (en) * | 1993-03-26 | 1996-07-30 | Olympus Optical Co., Ltd. | Two-unit zoom lens system |
US5850312A (en) * | 1993-10-22 | 1998-12-15 | Olympus Optical Co., Ltd. | Three-unit zoom lens |
US5675440A (en) * | 1994-04-12 | 1997-10-07 | Olympus Optical Co., Ltd. | Photographic lens |
US5663838A (en) * | 1994-09-07 | 1997-09-02 | Asahi Kogaku Kogyo Kabushiki Kaisha | Zoom lens system |
JPH1184236A (en) * | 1997-09-11 | 1999-03-26 | Asahi Optical Co Ltd | Zoom lens system |
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Also Published As
Publication number | Publication date |
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CN105445909A (en) | 2016-03-30 |
CN105445909B (en) | 2018-08-31 |
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Application publication date: 20180928 |