CN107643585A - Wide-angle lens - Google Patents
Wide-angle lens Download PDFInfo
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- CN107643585A CN107643585A CN201710561170.0A CN201710561170A CN107643585A CN 107643585 A CN107643585 A CN 107643585A CN 201710561170 A CN201710561170 A CN 201710561170A CN 107643585 A CN107643585 A CN 107643585A
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Abstract
A kind of wide-angle lens that can improve chromatic aberation on axle.Wide-angle lens (100) is made up of the first lens (10), the second lens (20), aperture (40) and the 3rd lens (30) configured successively from object side.At least one side of first lens (10) is aspherical, and first lens (10) are to make the diverging meniscus lens convex surface facing object side, the at least one side of second lens (20) is aspherical, and second lens (20) are to make the positive meniscus lens convex surface facing as side, the at least one side of 3rd lens (30) is aspherical, and the 3rd lens (30) are to make the positive lens convex surface facing as side.The Abbe number of first lens (10) is being set to v1, the Abbe number of the second lens (20) is being set to v2, when the Abbe number of the 3rd lens (30) is set into v3, Abbe number v1, v2, v3 are all higher than 50.
Description
Technical field
The present invention relates to wide-angle lens used in intercommunicating system of main entrance etc..
Background technology
As the lens for being installed in monitoring camera, vehicle-mounted camera, portable set camera etc., it has been proposed that
A kind of three groups of three pieces of lens for being configured with the first lens, the second lens, aperture and the 3rd lens successively from object side.Above-mentioned
In wide-angle lens, in order to realize cost degradation and slimming, using refraction in the first lens, the second lens and the 3rd lens
The of a relatively high plastic lens of rate (with reference to patent document 1).It is in addition, saturating using object side and as side in the second lens
The biconvex lens that mirror surface is protruded.
Prior art literature
Patent document
Patent document 1：Japanese Patent Laid-Open 2014-209190 publications
Because the trend that Abbe number diminishes be present in the higher lens of refractive index, thus ought be as described in Patent Document 1 it is wide
When in the second lens that minus lens protrudes on two sides like that using the higher plastic lens of refractive index, the dispersions of the second lens compared with
Greatly.On the other hand, due to requiring that it is higher that core has in wide-angle lens used in intercommunicating system in main entrance etc.
Resolution ratio, it is desirable to chromatic aberation on axle is smaller.However, in the wide-angle lens described in patent document 1, central part office
Resolution ratio improve requirement boundary be present.
The content of the invention
In view of the above problems, technical problem of the invention is to provide that a kind of to improve the wide-angle of chromatic aberation on axle saturating
Mirror.
In order to solve the above-mentioned technical problem, wide-angle lens of the invention is characterized in, by what is configured successively from object side
First lens, the second lens, aperture and the 3rd lens are formed, at least one sides of above-mentioned first lens be it is aspherical, and above-mentioned the
One lens are to make the diverging meniscus lens convex surface facing object side, and at least one side of above-mentioned second lens is aspherical, and above-mentioned
Second lens are to make the positive meniscus lens convex surface facing as side, and at least one side of above-mentioned 3rd lens is aspherical, and above-mentioned
3rd lens are to make the positive lens convex surface facing as side, the Abbe number of above-mentioned first lens are being set into v1, by above-mentioned second
The Abbe number of lens is set to v2, and when the Abbe number of above-mentioned 3rd lens is set into v3, Abbe number v1, v2, v3 are all higher than 50.
In the present invention, the Abbe number v1 of the first lens, the Abbe number v2 of the second lens, the Abbe number v3 of the 3rd lens are equal
More than 50, therefore, dispersion is smaller.It is meniscus lens to be additionally, since the second lens, therefore chromatic aberation passes through object side on axle
Offset with the surface as side on surface.Thus, chromatic aberation on the axle of wide-angle lens can be improved.Accordingly, it is capable to realize the interior of main entrance
The higher wide-angle lens of the resolution ratio of the central part such as wide-angle lens office used in portion's phone system.
In the present invention, such a way can be used：By the center for being located at the lens face as side of above-mentioned first lens
Radius of curvature be set to R12 (mm), the radius of curvature at the center of the lens face positioned at object side of above-mentioned second lens is set
For R21 (mm), the focal length of entirety is set to f0 (mm), is the convex surface that is protruded towards object side or towards thing in lens face
In the case of the concave surface of body side depression, radius of curvature R 12 and radius of curvature R 21 are set on the occasion of being towards picture in lens face
Side protrude convex surface or towards as side be recessed concave surface in the case of, radius of curvature R 12 and radius of curvature R 21 are set to negative
During value, the focal length f0 of radius of curvature R 12, radius of curvature R 21 and entirety meets following conditional：- 5 ＜ (R12 ×
R21)/f0 ＜ -2.According to aforesaid way, the reduction of astigmatism can be realized.
In the present invention, such a way can be used：By the lens face positioned at object side of above-mentioned first lens
The distance at center and the center for being located at the lens face as side of above-mentioned second lens is set to da (mm), by the focal length of entirety
When being set to f0 (mm), distance da and overall focal length f0 meet following conditional：1 ＜ da/f0 ＜ 6.According to above-mentioned side
Formula, because da/f0 is less than 6, therefore it can easily carry out the correction of astigmatism.Further, since da/f0 is more than 1, therefore light can be reduced
Learn the size of the optical axis direction of lens.
In the present invention, can be in the following way：Above-mentioned second lens and above-mentioned 3rd lens are configured to：Positioned at object
The lens face of side and be aspherical positioned at the lens face as side.According to aforesaid way, because lens shape is suitable, therefore
Aberration can be reduced.
In the present invention, such a way can be used：The focal length of above-mentioned first lens is being set to f1 (mm), will be whole
When the focal length of body is set to f0 (mm), the focal length f1 of above-mentioned first lens and overall focal length f0 meets following
Conditional：- 4 ＜ f1/f0 ＜ -0.5.
In the present invention, can be in the following way：
The synthesis focal length of above-mentioned first lens and above-mentioned second lens is being set to f12 (mm), it is saturating by the above-mentioned 3rd
When the focal length of mirror is set to f3 (mm), above-mentioned first lens and the synthesis focal length f12 of above-mentioned second lens and above-mentioned
The focal length f3 of three lens meets following conditional：3 ＜ f12/f3 ＜ 7.
In the present invention, can be in the following way：By above-mentioned first lens in the lens face of object side
The heart to the distance of image planes is that distance is set to D between image, when the focal length of entirety is set into f0 (mm), distance D and whole between image
The focal length f0 of body meets following conditional：4 ＜ D/f0 ＜ 10.
In the present invention, can be less than using horizontal field of view angle by the way of 100 degree.Used in the intercommunicating system of main entrance
Wide-angle lens in, due to that without the extremely increase angle of visual field, therefore can realize that the higher wide-angle of the resolution ratio of central part office is saturating
Mirror.
Invention effect
In the present invention, the Abbe number v1 of the first lens, the Abbe number v2 of the second lens, the Abbe number v3 of the 3rd lens are equal
More than 50, therefore, dispersion is smaller.It is meniscus lens to be additionally, since the second lens, therefore chromatic aberation passes through object side on axle
Offset with the surface as side on surface.Thus, chromatic aberation on the axle of wide-angle lens can be improved.Accordingly, it is capable to realize the interior of main entrance
The higher wide-angle lens of the resolution ratio of the central part such as wide-angle lens office used in portion's phone system.
Brief description of the drawings
Fig. 1 is the sectional view of the lens unit for the wide-angle lens for including embodiment of the present invention 1.
Fig. 2 is the explanation figure of the wide-angle lens shown in Fig. 1.
Fig. 3 is the explanation figure for the aberration characteristic for representing the wide-angle lens shown in Fig. 1.
Fig. 4 is the explanation figure of the wide-angle lens of embodiment of the present invention 2.
Fig. 5 is the explanation figure for the aberration characteristic for representing the wide-angle lens shown in Fig. 4.
Fig. 6 is the explanation figure of the wide-angle lens of embodiment of the present invention 3.
Fig. 7 is the explanation figure for the aberration characteristic for representing the wide-angle lens shown in Fig. 6.
(symbol description)
10 ... first lens；20 ... second lens；30 ... the 3rd lens；40 ... apertures；100 ... wide-angle lenses.
Embodiment
Hereinafter, the embodiment of the wide-angle lens of the application present invention is illustrated referring to the drawings.
(embodiment 1)
Fig. 1 is the sectional view of the lens unit 200 for the wide-angle lens 100 for representing to include embodiment of the present invention 1.
Fig. 2 is the explanation figure of the wide-angle lens 100 shown in Fig. 1, and Fig. 2 (a), Fig. 2 (b), Fig. 2 (c) are table respectively
Show the explanation figure of lens arrangement, the explanation figure of expression spherical aberration and the explanation figure for representing multiplying power chromatic aberation.Fig. 3 is to represent Fig. 1
The explanation figure of the aberration characteristic of shown wide-angle lens, Fig. 3 (a), Fig. 3 (b), Fig. 3 (c) represent astigmatism etc. respectively
Illustrate the explanation figure for scheming and representing lateral aberration.In addition, when each surface 1~9 is shown in Fig. 2 (a), to aspherical mark
" ﹡ ".Red light R (wavelength 486nm), green light G (wavelength are shown in (b), Fig. 2 (c) and Fig. 3 (a) in Fig. 2
588nm), each aberration in blue light B (wavelength 656nm), pupil radium (Pupil Radius) is shown in Fig. 2 (b)
It is 0.4798mm spherical aberration, maximum field of view (Max Field) multiplying power chromatic aberation is shown in Fig. 2 (c).In Fig. 3
(a) in, S is marked to the characteristic of sagittal direction, T is marked to the characteristic of tangential direction.In addition, the distortion table shown in Fig. 3 (a)
Show the changing ratio of the picture of shooting central portion and periphery, represent that the absolute value of the numerical value of distortion is smaller, then it may be said that lens
Precision is higher.Shown in Fig. 3 (b) angle for 0.00 degree, 12.11 degree, 23.90 degree, 35.18 degree, 46.03 degree, 56.64
The lateral aberration of both direction (y directions and x directions) orthogonal with the optical axis when spending.In addition, in Fig. 4~Fig. 7 described later substantially
It is identical.
As shown in figure 1, the lens unit 200 of present embodiment includes：Wide-angle with three groups three pieces of lens arrangement is saturating
Mirror 100；And the lens holders 210 kept to wide-angle lens 100.Wide-angle lens 100 has from object side successively
The first lens 10, the second lens 20, the lens 30 of aperture 40 and the 3rd of configuration, and be located at relative to the 3rd lens 30 as side
Position be configured with the flat filter 50 such as infrared filter, photographing element 60.Lens holders 210 have to filtering
The base plate 211 for the ring-type that device 50 is kept and the cylinder portion 212 extended from base plate 211 to object side, in cylinder portion 212
Inner side is configured with wide-angle lens 100.Outer peripheral face in cylinder portion 212 is used for lens formed with thread groove 215, the thread groove 215
Unit 200 is fixed on optical device.In the present embodiment, when wide-angle lens 100 to be located to the inner side in cylinder portion 212, the
The packing ring 70 of ring-type is configured between two lens 20 and aperture 40, in this condition, the ring-type for being formed at the inner side in a portion 212 is convex
Portion 213 is riveted in a manner of from object side, the peripheral end of the first lens 10 is covered.
As shown in Fig. 2 in wide-angle lens 100, at least one side of the first lens 10 is aspherical, and first lens 10
It is to make the diverging meniscus lens convex surface facing object side.At least one side of second lens 20 is aspherical, and second lens 20
It is to make the positive meniscus lens convex surface facing as side.At least one side of 3rd lens 30 is aspherical, and the 3rd lens 30 are
Make convex surface facing the positive lens as side.
In the present embodiment, the surface (the first face 1) of the object side of the first lens 10 is the convex surface of sphere, as side
Surface (the second face 2) be aspherical concave surface.The surface (the 3rd face 3) of the object side of second lens 20 is aspherical recessed
Face, as the surface (fourth face 4) of side is aspherical convex surface.The surface (the 6th face 6) of the object side of 3rd lens 30 is
Aspherical convex surface, as the surface (the 7th face 7) of side is aspherical convex surface.In the present embodiment, the first lens 10,
Two lens 20 and the 3rd lens 30 are formed by the plastic lens of the formation such as crylic acid resin, polycarbonate-based, TPO.
Aperture 40 forms the 5th face 5, and the surface of the object side of filter 50 forms octahedral 8, filter 50 as the surface of side
Form the 9th face 9.
The characteristic of wide-angle lens 100 formed in the above described manner, the physical property in each face, asphericity coefficient are shown in table 1.
(table 1)
| The overall focal length (f0) of lens combination | 2.114 millimeter |
| Distance between image | 15.235 millimeters |
| The overall F values of lens combination | 2.2 |
| Maximum field of view angle | 113 degree |
| Horizontal field of view angle | 92 degree |
| Surface | Radius of curvature | Thickness | Nd | vd | f |
| 1 | 16.200 | 0.800 | 1.491 | 58.0 | -4.655 |
| 2* | 1.970 | 2.900 | |||
| 3* | -3.937 | 2.950 | 1.531 | 55.8 | 9.436 |
| 4* | -2.778 | 1.450 | |||
| 5(stop：Aperture) | It is infinitely great | 0.140 | |||
| 6* | 4.260 | 3.090 | 1.531 | 55.8 | 5.366 |
| 7* | -6.445 | 2.000 | |||
| 8 | It is infinitely great | 0.850 | 1.517 | 64.1 | |
| 9 | It is infinitely great | 1.055 |
Asphericity coefficient
| Surface | C (1/ radius of curvature) | K | A4 |
| 2 | 5.07614E-01 | -4.56000E-01 | 1.74000E-03 |
| 3 | -2.54001E-01 | 1.60000E+00 | -2.60000E-03 |
| 4 | -3.59971E-01 | -2.53500E+00 | -4.15000E-03 |
| 6 | 2.34742E-01 | -1.73500E+00 | 1.27000E-02 |
| 7 | -1.55159E-01 | 0.00000E+00 | 1.34000E-02 |
| Surface | A6 | A8 | A10 |
| 2 | -3.85000E-04 | 1.63000E-04 | 0.00000E+00 |
| 3 | 9.80000E-04 | -2.14000E-04 | 5.20000E-05 |
| 4 | -2.76000E-04 | 1.33000E-04 | -1.25000E-05 |
| 6 | 1.09000E-03 | -8.00000E-04 | 1.60000E-04 |
| 7 | 3.75000E-03 | -1.27000E-03 | 3.00000E-04 |
Following project is shown in the first column of table 1.It is in addition, also identical in table 2 described later and table 3.
The overall focal length f0 (Effective Focal Length) of lens combination
Distance (Total Track) between image
The overall F values (Image Space F/#) of lens combination
Maximum field of view angle (Max Field Angle)
Horizontal field of view angle (Horizontal Field Angle)
The following project in each face is shown in the second column of table 1.Radius of curvature, thickness, the unit of focal length are
Millimeter.Herein, will in the case where lens face is the convex surface protruded towards object side or the concave surface being recessed towards object side
Radius of curvature is set on the occasion of in the situation that lens face is the concave surface being recessed towards the convex surface or direction protruded as side as side
Under, radius of curvature is set to negative value.It is in addition, also identical in table 2 described later and table 3.
Radius of curvature (Radius)
Thickness (Thickness)
Refractive index Nd
Abbe number vd
Focal length f
Shown in the third column of table 1 and the 4th column and in each face, aspheric is represented by following formula (mathematical expression 1)
Asphericity coefficient A4, A6, A8, A10 during the shape in face.In following formula, by sag amount (Japanese：サ グ amounts) (optical axis
The axle in direction) z is set to, the height (ray height) in the direction vertical with optical axis is set to r, circular cone coefficient is set to k, by curvature
The inverse of radius is set to c.It is in addition, also identical in table 2 described later and table 3.
[mathematical expression 1]
As shown in table 1, in the wide-angle lens 100 of present embodiment, the overall focal length f0 of lens combination is
2.114mm, distance is 15.235mm between image, and the overall F values of lens combination are 2.2, and maximum field of view angle is 113 degree, and level regards
Rink corner is less than 100 degree (92 degree).
Wide-angle lens 100 meets following full terms (1), (2), (3).First, as condition (1), by the first lens
10 Abbe number is set to v1, and the Abbe number of the second lens 20 is set into v2, when the Abbe number of the 3rd lens 30 is set into v3, Abbe
Number v1, v2, v3 are all higher than 50.More particularly, first, the Abbe number v1 of the first lens 10 is 58.0, and refractive index Nd is
1.491.The Abbe number v2 of second lens 20 is 55.8, and refractive index Nd is 1.531.The Abbe number v3 of 3rd lens 30 is 55.8,
Refractive index Nd is 1.531.Thus, Abbe number and refractive index meet following condition：
Abbe number
The ＞ 50 of first lens, 10 the 3rd lens of ＞ the second lens 20=30
Refractive index Nd
The lens 30 of first lens, 10 the second lens of ＜ 20=the 3rd
In addition, the radius of curvature at the center for being located at the lens face (the second face 2) as side of the first lens 10 is set to R12
(mm) radius of curvature at the center of the lens face (the 3rd face 3) positioned at object side of the second lens 20, is set to R21 (mm),
By entirety focal length be set to f0 (mm) when, radius of curvature R 12, radius of curvature R 21 and entirety focal length f0 meet with
Under condition (2).
Condition (2)：- 5 ＜ (R12 × R21)/f0 ＜ -2
More particularly, the radius of curvature R 12 at the center for being located at the lens face (the second face 2) as side of the first lens 10
It is 1.970mm, the radius of curvature R 21 at the center of the lens face (the 3rd face) positioned at object side of the second lens 20 is-
3.937 (mm), overall focal length f0 is 2.114mm, and therefore, (R12 × R21)/f0 is -3.67, meets above-mentioned condition
(2)。
In addition, by the center of the lens face (the first face 1) positioned at object side of the first lens 10 and the second lens
When distance positioned at the center of the lens face (fourth face 4) as side is set to da (mm), distance da and overall focal length f0
Meet following condition (3).
Condition (3)：1 ＜ da/f0 ＜ 6.
More particularly, distance da is 6.65mm, and overall focal length f0 is 2.114mm, and therefore, da/f0 is
3.146, meet above-mentioned condition (3).
In addition, the focal length of the first lens 10 is being set to f1 (mm), when the focal length of entirety is set into f0 (mm),
The focal length f1 of first lens 10 and overall focal length f0 meet following condition (4).
Condition (4)：- 4 ＜ f1/f0 ＜ -0.5.
More particularly, the focal length f1 of the first lens 10 is -4.655mm, and overall focal length f0 is
2.114mm, therefore, f1/f0 are -2.202, meet above-mentioned condition (4).
In addition, the synthesis focal length of the first lens 10 and the second lens 20 is being set to f12 (mm), by the 3rd lens
When focal length is set to f3 (mm), the synthesis focal length f12 of the first lens 10 and the second lens, the focus of the 3rd lens 30 away from
Meet following condition (5) from f3.
Condition (5)：3 ＜ f12/f3 ＜ 7.
More particularly, the synthesis focal length f12 of the first lens 10 and the second lens is 28.914mm, the 3rd lens 30
Focal length f3 be 5.366, therefore, f12/f3 is 5.388, meets above-mentioned condition (5).
In addition, the center of the lens face (the first face 1) positioned at object side of the first lens 10 to image planes (is being imaged into member
Part 60) distance be that distance is set to D (mm) between image, when the focal length of entirety is set into f0 (mm), distance D and whole between image
The focal length f0 of body meets following condition (6).
Condition (6)：4 ＜ D/f0 ＜ 10.
More particularly, distance D is 15.235 between image, and overall focal length f0 is 2.114mm, and therefore, D/f0 is
7.206, meet above-mentioned condition (6).
In this way, the wide-angle lens 100 of present embodiment is three groups three pieces of lens arrangement, and three pieces of lens are plastics.Cause
And the cost of wide-angle lens 100 can be reduced, and lightweight can be realized.In addition, in the present embodiment, the first lens 10
Abbe number v1, the Abbe number v2 of the second lens 20, the Abbe number v3 of the 3rd lens 30 are all higher than 50, meet condition (1), therefore,
Dispersion is smaller.Moreover, the second lens 20 are meniscus lens, in the second lens 20, chromatic aberation passes through object side on axle table
Face (the 3rd face 3) as the surface (fourth face 4) of side with offsetting.Thus, as shown in Fig. 2 colour on the axle of wide-angle lens 100
Difference is smaller.Therefore, wide-angle lens 100, which is suitable as optical system used in the intercommunicating system of main entrance etc., need not make to regard
Rink corner, which extremely becomes in big optical system, requires central part has the optical system of high-resolution.
In addition, the radius of curvature R 12 (mm) at the center for being located at the lens face (the second face 2) as side of the first lens 10,
The radius of curvature R 21 (mm) at the center of the lens face (the 3rd face 3) positioned at object side of the second lens 20 and the focus of entirety
Distance f0 (mm) meets condition (2).Therefore, as shown in figure 3, astigmatism by the first lens 10 as surface (the second face of side
2) with the surface (the 3rd face 3) of the object sides of the second lens 20 and offset.Thus, the astigmatism of wide-angle lens 100 can be realized
Reduce.
That is, it is that wide-angle lens 100 can not be made by existing below -5 or in the case of more than -2 in (R12 × R21)/f0
The trend that astigmatism is substantially reduced, therefore, in order to reduce astigmatism, it may be desirable to, radius of curvature R 12, R21 meet condition (2).
In addition, the center of lens face (the first face 1) positioned at object side and being located at for the second lens of the first lens 10
As the distance da (mm) at the center of the lens face (fourth face 4) of side meets condition (3).Thus, da/f0 is less than 6, accordingly, it is capable to
Easily carry out the correction of astigmatism.In addition, da/f0 is more than 1, accordingly, it is capable to reduce the size of the optical axis direction of wide-angle lens 100
(distance between image).
In addition, the two sides of the second lens 20 and the 3rd lens 30 is aspherical, accordingly, it is capable to reduce spherical aberration iseikonia
Difference.
In addition, the focal length f1 (mm) of the first lens 10, overall focal length f0 (mm) meet condition (4).Thus,
F1/f0 is more than -4, accordingly, it is capable to prevent the negative refractive power of the first lens 10 from dying down, and can reduce the optical axis side of wide-angle lens 100
To size (distance between image).In addition, f1/f0 is less than -0.5, accordingly, it is capable to easily carry out the correction of coma aberration.
In addition, synthesis focal length f12 (mm), the focal length f3 of the 3rd lens of the first lens 10 and the second lens 20
(mm) condition (5) is met.Thus, f12/f3 is more than 3, accordingly, it is capable to prevent that the refracting power of the first lens and the second lens from becoming strong, and
Easily each aberration can be corrected.In addition, f12/f3 is less than 7, accordingly, it is capable to prevent the refraction of the first lens and the second lens
Power dies down, and can reduce the size (distance between image) of the optical axis direction of wide-angle lens 100.
In addition, distance D (mm), overall focal length f0 (mm) meet condition (6) between image.Thus, D/f0 is more than 4,
Accordingly, it is capable to easily carry out spherical aberration, distort the correction of aberration.In addition, D/f0 is less than 10, accordingly, it is capable to reduce wide-angle lens
The size (distance between image) of 100 optical axis direction.
(embodiment 2)
Fig. 4 is the explanation figure of the wide-angle lens 100 of embodiment of the present invention 2, Fig. 4 (a), Fig. 4 (b), Fig. 4 (c)
It is to represent the explanation figure of lens arrangement, represent the explanation figure of spherical aberration and represent the explanation figure of multiplying power chromatic aberation respectively.Fig. 5 is
The explanation figure of the aberration characteristic of the wide-angle lens shown in Fig. 4 is represented, Fig. 5 (a), Fig. 5 (b), Fig. 5 (c) are represented respectively
The explanation figure of astigmatism etc. and the explanation figure for representing lateral aberration.Shown in Fig. 5 (b) angle for 0.00 degree, 12.09 degree,
The horizontal picture of both direction (y directions and x directions) orthogonal with the optical axis at 23.88 degree, 35.17 degree, 46.00 degree, 56.44 degree
Difference.
As shown in figure 4, the wide-angle lens 100 of present embodiment is also identical with embodiment 1, have from object side successively
The first lens 10, the second lens 20, the lens 30 of aperture 40 and the 3rd of configuration.At least one side of first lens 10 be it is aspherical,
And first lens 10 are to make the diverging meniscus lens convex surface facing object side.At least one side of second lens 20 be it is aspherical,
And second lens 20 are to make the positive meniscus lens convex surface facing as side.At least one side of 3rd lens 30 is aspherical, and
3rd lens 30 are to make the positive lens convex surface facing as side.
In the present embodiment, the first lens 10 are identical with embodiment 1, and the surface (the first face 1) of object side is ball
The convex surface in face, as the surface (the second face 2) of side is aspherical concave surface.The surface the (the 3rd of the object side of second lens 20
Face 3) it is aspherical concave surface, as the surface (fourth face 4) of side is aspherical convex surface.The object side of 3rd lens 30
Surface (the 6th face 6) is aspherical convex surface, as the surface (the 7th face 7) of side is aspherical convex surface.In present embodiment
In, the first lens 10, the second lens 20 and the 3rd lens 30 are made up of plastic lens.Aperture 40 forms the 5th face 5, filter 50
Object side surface form octahedral 8, filter 50 as side surface form the 9th face 9.
The characteristic of wide-angle lens 100 formed in the above described manner, the physical property in each face, asphericity coefficient are shown in table 2.
(table 2)
| The overall focal length (f0) of lens combination | 2.120 millimeter |
| Distance between image | 15.072 millimeters |
| The overall F values of lens combination | 2.2 |
| Maximum field of view angle | 113 degree |
| Horizontal field of view angle | 92 degree |
| Surface | Radius of curvature | Thickness | Nd | vd | f |
| 1 | 14.200 | 0.700 | 1.491 | 58.0 | -5.213 |
| 2* | 2.133 | 3.185 | |||
| 3* | -3.690 | 2.950 | 1.531 | 55.8 | 9.522 |
| 4* | -2.725 | 1.520 | |||
| 5(stop：Aperture） | It is infinitely great | 0.087 | |||
| 6* | 4.126 | 2.730 | 1.531 | 55.8 | 5.416 |
| 7* | -7.320 | 1.995 | |||
| 8 | It is infinitely great | 0.850 | 1.517 | 64.1 | |
| 9 | It is infinitely great | 1.055 |
Asphericity coefficient
| Surface | C (1/ radius of curvature) | K | A4 |
| 2 | 4.68823E-01 | -4.00000E-01 | 1.06000E-03 |
| 3 | -2.71003E-01 | 7.06000E-01 | -1.40000E-03 |
| 4 | -3.66972E-01 | -2.67000E+00 | -3.27000E-03 |
| 6 | 2.42365E-01 | -5.50000E-01 | 1.50000E-02 |
| 7 | -1.36612E-01 | 0.00000E+00 | 1.70000E-02 |
| Surface | A6 | A8 | A10 |
| 2 | -1.71000E-04 | 7.99000E-05 | 0.00000E+00 |
| 3 | 1.67000E-04 | 6.95000E-05 | 7.00000E-06 |
| 4 | -7.46000E-05 | 8.03000E-05 | -4.66000E-06 |
| 6 | 7.80000E-04 | -7.10000E-04 | 1.42000E-04 |
| 7 | 4.56000E-03 | -1.53000E-03 | 4.56000E-04 |
As shown in table 2, in the wide-angle lens 100 of present embodiment, the overall focal length f0 of lens combination is
2.120mm, distance is 15.072mm between image, and the overall F values of lens combination are 2.2, and maximum field of view angle is 113 degree, and level regards
Rink corner is less than 100 degree (92 degree).
In addition, wide-angle lens 100 meets following full terms (1), (2), (3).First, as condition (1), by first
The Abbe number of lens 10 is set to v1, and the Abbe number of the second lens 20 is set into v2, when the Abbe number of the 3rd lens 30 is set into v3,
Abbe number v1, v2, v3 are all higher than 50.More particularly, first, the Abbe number v1 of the first lens 10 is 58.0, and refractive index Nd is
1.491.The Abbe number v2 of second lens 20 is 55.8, and refractive index Nd is 1.531.The Abbe number v3 of 3rd lens 30 is 55.8,
Refractive index Nd is 1.531.Thus, Abbe number and refractive index meet following condition：
Abbe number
The ＞ 50 of first lens, 10 the 3rd lens of ＞ the second lens 20=30
Refractive index Nd
The lens 30 of first lens, 10 the second lens of ＜ 20=the 3rd
In addition, the radius of curvature R 12 (mm) at the center for being located at the lens face (the second face 2) as side of the first lens 10,
The radius of curvature R 21 (mm) and focal length f0 at the center of the lens face (the 3rd face 3) positioned at object side of the second lens 20
Meet following condition (2).
Condition (2)：- 5 ＜ (R12 × R21)/f0 ＜ -2
More particularly, the radius of curvature R 12 at the center for being located at the lens face (the second face 2) as side of the first lens 10
It is 2.133mm, the radius of curvature R 21 at the center of the lens face (the 3rd face 3) positioned at object side of the second lens 20 is-
3.690 (mm), overall focal length f0 is 2.120mm, and therefore, (R12 × R21)/f0 is -3.71, meets above-mentioned condition
(2)。
In addition, by the center of the lens face (the first face 1) positioned at object side of the first lens 10 and the second lens
When distance positioned at the center of the lens face (fourth face 4) as side is set to da (mm), distance da and overall focal length f0
Meet following condition (3).
Condition (3)：1 ＜ da/f0 ＜ 6.
More particularly, distance da is 6.84mm, and overall focal length f0 is 2.120mm, and therefore, da/f0 is
3.226, meet above-mentioned condition (3).
In addition, the focal length of the first lens 10 is being set to f1 (mm), when the focal length of entirety is set into f0 (mm),
The focal length f1 of first lens 10 and overall focal length f0 meet following condition (4).
Condition (4)：- 4 ＜ f1/f0 ＜ -0.5.
More particularly, the focal length f1 of the first lens 10 is -5.213mm, and overall focal length f0 is
2.120mm, therefore, f1/f0 are -2.459, meet above-mentioned condition (4).
In addition, the synthesis focal length of the first lens 10 and the second lens 20 is being set to f12 (mm), by the 3rd lens
When focal length is set to f3 (mm), the synthesis focal length f12 of the first lens 10 and the second lens, the focus of the 3rd lens 30 away from
Meet following condition (5) from f3.
Condition (5)：3 ＜ f12/f3 ＜ 7.
More particularly, the synthesis focal length f12 of the first lens 10 and the second lens is 20.968mm, the 3rd lens 30
Focal length f3 be 5.416, therefore, f12/f3 is 3.871, meets above-mentioned condition (5).
In addition, the center of the lens face (the first face 1) positioned at object side of the first lens 10 to image planes (is being imaged into member
Part 60) distance be that distance is set to D (mm) between image, when the focal length of entirety is set into f0 (mm), distance D and whole between image
The focal length f0 of body meets following condition (6).
Condition (6)：4 ＜ D/f0 ＜ 10.
More particularly, distance D is 15.072 between image, and overall focal length f0 is 2.120mm, and therefore, D/f0 is
7.109, meet above-mentioned condition (6).
In this way, the wide-angle lens 100 of present embodiment is three groups three pieces of lens arrangement, and three pieces of lens are plastics.Cause
And the cost of wide-angle lens 100 can be reduced, and lightweight can be realized.In addition, the Abbe number v1 of the first lens 10, second saturating
Abbe number v2, the Abbe number v3 of the 3rd lens 30 of mirror 20 are all higher than 50, meet condition (1), therefore, dispersion is smaller.Moreover, the
Two lens 20 are meniscus lens, therefore, in the second lens 20, chromatic aberation passes through object side on axle surface (the 3rd face 3)
Offset with the surface (fourth face 4) as side.Thus, the smaller grade of chromatic aberation on the axle of wide-angle lens 100 can be obtained with implementing
The identical effect of mode 1.
(embodiment 3)
Fig. 6 is the explanation figure of the wide-angle lens 100 of embodiment of the present invention 3, Fig. 6 (a), Fig. 6 (b), Fig. 6 (c)
It is to represent the explanation figure of lens arrangement, represent the explanation figure of spherical aberration and represent the explanation figure of multiplying power chromatic aberation respectively.Fig. 7 is
The explanation figure of the aberration characteristic of the wide-angle lens shown in Fig. 6 is represented, Fig. 7 (a), Fig. 7 (b), Fig. 7 (c) are represented respectively
The explanation figure of astigmatism etc. and the explanation figure for representing lateral aberration.Shown in Fig. 7 (b) angle for 0.00 degree, 12.12 degree,
The horizontal picture of both direction (y directions and x directions) orthogonal with the optical axis at 23.91 degree, 35.18 degree, 46.00 degree, 56.55 degree
Difference.
As shown in fig. 6, the wide-angle lens 100 of present embodiment is also identical with embodiment 1, have from object side successively
The first lens 10, the second lens 20, the lens 30 of aperture 40 and the 3rd of configuration.At least one side of first lens 10 be it is aspherical,
And first lens 10 are to make the diverging meniscus lens convex surface facing object side.At least one side of second lens 20 be it is aspherical,
And second lens 20 are to make the positive meniscus lens convex surface facing as side.At least one side of 3rd lens 30 is aspherical, and
3rd lens 30 are to make the positive lens convex surface facing as side.
In the present embodiment, the first lens 10 are identical with embodiment 1, and the surface (the first face 1) of object side is ball
The convex surface in face, as the surface (the second face 2) of side is aspherical concave surface.The surface the (the 3rd of the object side of second lens 20
Face 3) it is aspherical concave surface, as the surface (fourth face 4) of side is aspherical convex surface.The object side of 3rd lens 30
Surface (the 6th face 6) is aspherical convex surface, as the surface (the 7th face 7) of side is aspherical convex surface.In present embodiment
In, the first lens 10, the second lens 20 and the 3rd lens 30 are made up of plastic lens.Aperture 40 forms the 5th face 5, filter 50
Object side surface form octahedral 8, filter 50 as side surface form the 9th face 9.
The characteristic of wide-angle lens 100 formed in the above described manner, the physical property in each face, asphericity coefficient are shown in table 3.
(table 3)
| The overall focal length (f0) of lens combination | 2.112 millimeter |
| Distance between image | 15.185 millimeters |
| The overall F values of lens combination | 2.2 |
| Maximum field of view angle | 113 degree |
| Horizontal field of view angle | 92 degree |
| Surface | Radius of curvature | Thickness | Nd | vd | f |
| 1 | 17.100 | 0.800 | 1.491 | 58.0 | -4.563 |
| 2* | 1.950 | 2.840 | |||
| 3* | -3.957 | 2.950 | 1.531 | 55.8 | 9.359 |
| 4* | -2.773 | 1.450 | |||
| 5(stop：Aperture) | It is infinitely great | 0.125 | |||
| 6* | 4.240 | 3.120 | 1.531 | 55.8 | 5.369 |
| 7* | -6.485 | 1.995 | |||
| 8 | It is infinitely great | 0.850 | 1.517 | 64.1 | |
| 9 | It is infinitely great | 1.055 |
Asphericity coefficient
| Surface | C (1/ radius of curvature) | K | A4 |
| 2 | 5.12821E-01 | -4.70000E-01 | 1.75000E-03 |
| 3 | -2.52717E-01 | 1.61500E+00 | -2.55000E-03 |
| 4 | -3.60620E-01 | -2.55000E+00 | -4.08000E-03 |
| 6 | 2.35849E-01 | -1.60000E+00 | 1.29000E-02 |
| 7 | -1.54202E-01 | 0.00000E+00 | 1.38000E-02 |
| Surface | A6 | A8 | A10 |
| 2 | -3.10000E-04 | 1.62000E-04 | 0.00000E+00 |
| 3 | 9.94000E-04 | -2.15000E-04 | 5.12000E-05 |
| 4 | -2.76000E-04 | 1.33000E-04 | -1.22000E-05 |
| 6 | 1.04000E-03 | -8.00000E-04 | 1.57000E-04 |
| 7 | 3.87000E-03 | -1.28000E-03 | 3.02000E-04 |
As shown in table 3, in the wide-angle lens 100 of present embodiment, the overall focal length f0 of lens combination is
2.112mm, distance is 15.185mm between image, and the overall F values of lens combination are 2.2, and maximum field of view angle is 113 degree, and level regards
Rink corner is less than 100 degree (92 degree).
In addition, wide-angle lens 100 meets following full terms (1), (2), (3).First, as condition (1), by first
The Abbe number of lens 10 is set to v1, and the Abbe number of the second lens 20 is set into v2, when the Abbe number of the 3rd lens 30 is set into v3,
Abbe number v1, v2, v3 are all higher than 50.More particularly, first, the Abbe number v1 of the first lens 10 is 58.0, and refractive index Nd is
1.491.The Abbe number v2 of second lens 20 is 55.8, and refractive index Nd is 1.531.The Abbe number v3 of 3rd lens 30 is 55.8,
Refractive index Nd is 1.531.Thus, Abbe number and refractive index meet following condition：
Abbe number
The ＞ 50 of first lens, 10 the 3rd lens of ＞ the second lens 20=30
Refractive index Nd
The lens 30 of first lens, 10 the second lens of ＜ 20=the 3rd
In addition, the radius of curvature R 12 (mm) at the center for being located at the lens face (the second face 2) as side of the first lens 10,
The radius of curvature R 21 (mm) and focal length f0 at the center of the lens face (the 3rd face 3) positioned at object side of the second lens 20
Meet following condition (2).
Condition (2)：- 5 ＜ (R12 × R21)/f0 ＜ -2
More particularly, the radius of curvature R 12 at the center for being located at the lens face (the second face 2) as side of the first lens 10
It is 1.950mm, the radius of curvature R 21 at the center of the lens face (the 3rd face 3) positioned at object side of the second lens 20 is-
3.957 (mm), overall focal length f0 is 2.112mm, and therefore, (R12 × R21)/f0 is -3.65, meets above-mentioned condition
(2)。
In addition, by the center of the lens face (the first face 1) positioned at object side of the first lens 10 and the second lens
When distance positioned at the center of the lens face (fourth face 4) as side is set to da (mm), distance da and overall focal length f0
Meet following condition (3).
Condition (3)：1 ＜ da/f0 ＜ 6.
More particularly, distance da is 6.59mm, and overall focal length f0 is 2.112mm, and therefore, da/f0 is
3.120, meet above-mentioned condition (3).
In addition, the focal length of the first lens 10 is being set to f1 (mm), when the focal length of entirety is set into f0 (mm),
The focal length f1 of first lens 10 and overall focal length f0 meet following condition (4).
Condition (4)：- 4 ＜ f1/f0 ＜ -0.5.
More particularly, the focal length f1 of the first lens 10 is -4.563mm, and overall focal length f0 is
2.112mm, therefore, f1/f0 are -2.161, meet above-mentioned condition (4).
In addition, the synthesis focal length of the first lens 10 and the second lens 20 is being set to f12 (mm), by the 3rd lens
When focal length is set to f3 (mm), the synthesis focal length f12 of the first lens 10 and the second lens, the focus of the 3rd lens 30 away from
Meet following condition (5) from f3.
Condition (5)：3 ＜ f12/f3 ＜ 7.
More particularly, the synthesis focal length f12 of the first lens 10 and the second lens is 29.926mm, the 3rd lens 30
Focal length f3 be 5.369, therefore, f12/f3 is 5.574, meets above-mentioned condition (5).
In addition, the center of the lens face (the first face 1) positioned at object side of the first lens 10 to image planes (is being imaged into member
Part 60) distance be that distance is set to D (mm) between image, when the focal length of entirety is set into f0 (mm), distance D and whole between image
The focal length f0 of body meets following condition (6).
Condition (6)：4 ＜ D/f0 ＜ 10.
More particularly, distance D is 15.185 between image, and overall focal length f0 is 2.112mm, and therefore, D/f0 is
7.189, meet above-mentioned condition (6).
In this way, the wide-angle lens 100 of present embodiment is three groups three pieces of lens arrangement, and three pieces of lens are plastics.Cause
And the cost of wide-angle lens 100 can be reduced, and lightweight can be realized.In addition, in the present embodiment, the first lens 10
Abbe number v1, the Abbe number v2 of the second lens 20, the Abbe number v3 of the 3rd lens 30 are all higher than 50, meet condition (1), therefore,
Dispersion is smaller.Moreover, the second lens 20 are meniscus lens, therefore, in the second lens 20, chromatic aberation passes through object side on axle
Surface (the 3rd face 3) and offset as the surface (the 4th 0 face 4) of side.Thus, the axle colouring of wide-angle lens 100 can be obtained
The smaller grade of aberration and the identical effect of embodiment 1.
[other embodiment]
In above-mentioned embodiment 1,2,3, the two sides of the second lens 20 and the 3rd lens 30 is aspherical, but can also be
In one or both in second lens 20 and the 3rd lens 30, one side is only set to aspherical.
In the above-described embodiment, the Abbe number v1 of the first lens 10 is 58.0, the second lens 20 and the 3rd lens 30
Abbe number v2, v3 are 55.8, but various researchs as a result, Abbe number v1, v2, v3 are not limited to above-mentioned numerical value, as long as
More than 50, just chromatic aberation on sufficient axle can be obtained as wide-angle lens used in the intercommunicating system of main entrance 100.
Claims (8)
- A kind of 1. wide-angle lens, it is characterised in thatIt is made up of the first lens, the second lens, aperture and the 3rd lens configured successively from object side,At least one side of first lens is aspherical, and first lens are to make the negative bent moon convex surface facing object side Lens,At least one side of second lens be it is aspherical, and second lens be make it is saturating convex surface facing the positive bent moon as side Mirror,At least one side of 3rd lens is aspherical, and the 3rd lens are to make the positive lens convex surface facing as side,The Abbe number of first lens is being set to v1, the Abbe number of second lens is set to v2, it is saturating by the described 3rd When the Abbe number of mirror is set to v3, Abbe number v1, v2, v3 are all higher than 50.
- 2. wide-angle lens as claimed in claim 1, it is characterised in thatThe radius of curvature at the center for being located at the lens face as side of first lens is set to R12 (mm), by described second The radius of curvature at the center of the lens face positioned at object side of lens is set to R21 (mm), and the focal length of entirety is set into f0 (mm), in the case where lens face is the convex surface protruded towards object side or the concave surface being recessed towards object side, by curvature Radius R12 and radius of curvature R 21 are set on the occasion of in lens face for towards the convex surface protruded as side or towards as side depression In the case of concave surface, when radius of curvature R 12 and radius of curvature R 21 are set into negative value, radius of curvature R 12, radius of curvature R 21 and whole The focal length f0 of body meets following conditional：- 5 ＜ (R12 × R21)/f0 ＜ -2.
- 3. wide-angle lens as claimed in claim 1, it is characterised in thatIn being located at the center of the lens face positioned at object side of first lens and second lens as side The distance at the center of lens face is set to da (mm), when the focal length of entirety is set into f0 (mm), distance da and overall focus Distance f0 meets following conditional：1 ＜ da/f0 ＜ 6.
- 4. wide-angle lens as claimed in claim 1, it is characterised in thatSecond lens and the 3rd lens are configured to：Positioned at the lens face of object side and positioned at the lens as side Face is aspherical.
- 5. wide-angle lens as claimed in claim 1, it is characterised in thatThe focal length of first lens is being set to f1 (mm), when the focal length of entirety is set into f0 (mm), described the The focal length f1 of one lens and overall focal length f0 meet following conditional：- 4 ＜ f1/f0 ＜ -0.5.
- 6. wide-angle lens as claimed in claim 1, it is characterised in thatThe synthesis focal length of first lens and second lens is being set to f12 (mm), by the 3rd lens When focal length is set to f3 (mm), the synthesis focal length f12 of first lens and second lens and described 3rd saturating The focal length f3 of mirror meets following conditional：3 ＜ f12/f3 ＜ 7.
- 7. wide-angle lens as claimed in claim 1, it is characterised in thatIt is being that distance is set between image by center to the distance of image planes of the lens face positioned at object side of first lens D, when the focal length of entirety is set into f0 (mm), distance D and overall focal length f0 meet following conditional between image：4 ＜ D/f0 ＜ 10.
- 8. the wide-angle lens as any one of Claims 1-4, it is characterised in thatHorizontal field of view angle is less than 100 degree.
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| JP2016144442A JP6800640B2 (en) | 2016-07-22 | 2016-07-22 | Wide-angle lens |
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Also Published As
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|---|---|
| CN107643585B (en) | 2020-04-14 |
| JP6800640B2 (en) | 2020-12-16 |
| JP2018013704A (en) | 2018-01-25 |
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