CN206282021U - A kind of wide-angle lens - Google Patents
A kind of wide-angle lens Download PDFInfo
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- CN206282021U CN206282021U CN201621212742.1U CN201621212742U CN206282021U CN 206282021 U CN206282021 U CN 206282021U CN 201621212742 U CN201621212742 U CN 201621212742U CN 206282021 U CN206282021 U CN 206282021U
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Abstract
The utility model discloses a kind of wide-angle lens, and the camera lens includes：The first lens, the second lens, the 3rd lens, diaphragm, the 4th lens, the 5th lens, the 6th lens and the 7th lens set gradually along light incident direction；First lens are the sphere negative lens that two surfaces are convex to object space；Second lens and the 3rd lens are the sphere positive lens that two surfaces are convex to object space；4th lens are the sphere positive lens that two surfaces are convex to image space；5th lens and the 6th lens are glued positive lens, and the 5th lens are spherical mirror, and the 6th lens are sphere near the surface of the 5th lens；7th lens are aspherical positive lens；The technical solution of the utility model can strictly control CRA while all complexity using aspheric lens structures are avoided, effectively correction off-axis aberration and the curvature of field, and compact conformation, cost are relatively low, imaging clearly, it is adaptable to for being imaged and projecting.
Description
Technical field
The utility model is related to optical lens technical field, and in particular to a kind of wide-angle lens.
Background technology
At present, Miniature wide-angle lens are because its visual angle is wider, and the depth of field is very deep, are widely used in shooting compared with large scene
Photo, such as building, in landscape subject matter.
Existing Miniature wide-angle lens typically all use spheric glass using aspherical lens or all, all using non-
The problem that spheric glass is present is complex structure, with high costs, and the problem for all being existed using spheric glass is system overall outward
Shape is big, it is impossible to which the CRA (ChiefRayAngle, key light angle) to each visual field is strict with, and causes to relax to CRA
Requirement.
Utility model content
The utility model provide a kind of wide-angle lens, with solve all using aspherical lens cause complex structure, into
This high problem, and solution all causes system monnolithic case big using spheric glass, it is impossible to the CRA to each visual field is carried out
The problem of strict demand.
The utility model provides a kind of wide-angle lens, including set gradually along light incident direction the first lens L1,
Second lens L2, the 3rd lens L3, diaphragm L0, the 4th lens L4, the 5th lens L5, the 6th lens L6 and the 7th lens L7；
First lens L1 is the sphere negative lens that two surfaces are convex to object space；
Second lens L2 is the sphere positive lens that two surfaces are convex to object space；
3rd lens L3 is the sphere positive lens that two surfaces are convex to object space；
4th lens L4 is the sphere positive lens that two surfaces are convex to image space；
5th lens L5 and the 6th lens L6 is glued positive lens, and the 5th lens L5 is spherical mirror, and the 6th lens L6 is close to
The surface of the 5th lens L5 is sphere；
7th lens L7 is aspherical positive lens.
The beneficial effects of the utility model are：A kind of wide-angle lens of the present utility model, first, the multiple of system forward part
Lens all use spheric glass, and last lens only is set into aspherical lens, or only simultaneously that penultimate is saturating
Finally simultaneously being set to for mirror is aspherical, i.e., set aspherical before image planes, so as to can either avoid all using aspherical mirror
The complexity of piece, can realize strictly controlling CRA again, additionally it is possible to CRA be optimized according to different requirements, while can correct
The curvature of field so that lateral chromatic aberration is small, can be not only suitable for imaging system in visible light wave range (450nm-610nm) blur-free imaging, and
Suitable for optical projection system.
Secondly, diaphragm is arranged between the 3rd lens and the 4th lens, and the 3rd lens and the 4th lens are disposed as two
Surface concaves towards the sphere positive lens of diaphragm so that the 4th lens have positive role to the difference that compensating stop front lens brings,
The difference such as coma, chromatic longitudiinal aberration and off-axis aberration can effectively be corrected；The glued positive lens of the 5th lens and the 6th lens can
Play a part of good correcting chromatic aberration.
Brief description of the drawings
Fig. 1 is a kind of structure principle chart of wide-angle lens of the utility model one embodiment；
Fig. 2 is a kind of structural representation of wide-angle lens of the utility model one embodiment；
Fig. 3 is a kind of maximum field of view's angle schematic diagram of wide-angle lens of the utility model one embodiment；
Fig. 4 is a kind of curvature of field difference figure of wide-angle lens of the utility model one embodiment；
Fig. 5 is a kind of spherical aberration difference figure of wide-angle lens of the utility model one embodiment；
Fig. 6 is a kind of lateral chromatic aberration difference figure of wide-angle lens of the utility model one embodiment.
Specific embodiment
A kind of prior art of wide-angle lens is：Spheric glass all is used using aspherical lens or all, but entirely
There is complex structure, with high costs in portion, all there is system monnolithic case using spheric glass using aspherical lens
Greatly, it is impossible to the problem for being strict with the CRA of each visual field, cause that the requirement to CRA can only be relaxed.
Design concept of the present utility model is：Or aspherical lens all are used for existing wide-angle lens, or
All use spheric glass, it is caused complex structure, with high costs, or system monnolithic case it is big, cannot be to each visual field
The problem that CRA is strict with, the utility model all uses sphere in multiple lens of wide-angle lens system previous section
Last lens is only set to aspherical lens, or only simultaneously set the last one side of penultimate lens by eyeglass
For aspherical, i.e., set aspherical before image planes, can either so avoid complexity all using aspherical lens, again can
Realize strict control CRA, additionally it is possible to CRA is optimized according to different requirements, while the curvature of field can be corrected so that lateral chromatic aberration
It is small, imaging system can be not only suitable in visible light wave range (450nm-610nm) blur-free imaging, and suitable for optical projection system.Together
When, the diaphragm of system is arranged between the 3rd lens and the 4th lens, and the 3rd lens and the 4th lens are disposed as two surfaces
Concave towards the sphere positive lens of diaphragm so that the 4th lens have positive role to the difference that compensating stop front lens brings, can
Effectively correction coma, chromatic longitudiinal aberration and off-axis aberration etc. are differed.
Embodiment one
Fig. 1 is a kind of structure principle chart of wide-angle lens of the utility model one embodiment, and Fig. 2 is the utility model one
A kind of structural representation of wide-angle lens of individual embodiment, referring to Fig. 1 and Fig. 2, the wide-angle lens includes：Along light incident direction
The first lens L1, the second lens L2, the 3rd lens L3, diaphragm L0, the 4th lens L4, the 5th lens L5, the 6th for setting gradually
Lens L6 and the 7th lens L7；
First lens L1 is the sphere negative lens that two surfaces are convex to object space；
Second lens L2 is the sphere positive lens that two surfaces are convex to object space；
3rd lens L3 is the sphere positive lens that two surfaces are convex to object space；
4th lens L4 is the sphere positive lens that two surfaces are convex to image space；
5th lens L5 and the 6th lens L6 is glued positive lens, and the 5th lens L5 is spherical mirror, and the 6th lens L6 is close to
The surface of the 5th lens L5 is sphere；
7th lens L7 is aspherical positive lens.
Knowable to wide-angle lens as shown in Figure 1, last lens is set to aspherical lens in the present embodiment, i.e., in picture
Set aspherical in front, can either so avoid complexity all using aspherical lens, reduce system bulk, again can be real
It is now strict to control CRA, additionally it is possible to CRA to be optimized according to different requirements, while the curvature of field can be corrected so that lateral chromatic aberration
It is small, can be in visible light wave range (450nm-610nm) blur-free imaging.Meanwhile, the diaphragm of system is arranged on the 3rd lens and the 4th
Between lens, the 3rd lens and the 4th lens are disposed as the sphere positive lens that two surfaces concave towards diaphragm so that the 4th is saturating
Mirror has positive role to the difference that compensating stop front lens brings, and can effectively correct coma, chromatic longitudiinal aberration and off-axis aberration etc.
Difference；Its lens L5 of glued mirror the 5th and the 6th lens L6 can play a part of good correcting chromatic aberration.
Embodiment two
It is pass that emphasis meets respectively to the refractive index Nd and Abbe number Vd of each lens of wide-angle lens in the present embodiment
It is that formula is illustrated, other guide is referring to other embodiment of the present utility model.Wide-angle lens of the present utility model, each lens
Refractive index Nd and Abbe number Vd meet following relational expression respectively.
The refractive index Nd1 and Abbe number Vd1 of the first lens L1 meet relationship below respectively:
1.5<Nd1<1.6,55<Vd1<65；
The refractive index Nd2 and Abbe number Vd2 of the second lens L2 meet relationship below respectively:
1.64<Nd2<1.74,50<Vd2<60；
The refractive index Nd3 and Abbe number Vd3 of the 3rd lens L3 meet relationship below respectively:
1.6<Nd3<1.7,46<Vd3<56；
The refractive index Nd4 and Abbe number Vd4 of the 4th lens L4 meet relationship below respectively:
1.8<Nd4<1.88,41<Vd4<50；
The refractive index Nd5 and Abbe number Vd5 of the 5th lens L5 meet relationship below respectively:
1.72<Nd5<1.81,40<Vd5<55,
The refractive index Nd6 and Abbe number Vd6 of the 6th lens L6 meet relationship below respectively:
1.7<Nd6<1.78,25<Vd6<40；
The refractive index Nd7 and Abbe number Vd7 of the 7th lens L7 meet relationship below respectively:
1.55<Nd7<1.7,50<Vd7<83.
It should be noted that relatively low to the Nd and Vd of the 7th lens L7 requirement, can using glass also with plastic injection into
Type；To other lenses, the i.e. selection of the glass for lenses of the first lens L6 of lens L1 to the 6th, with diversity, can be according to difference
It is required that optimizing proportioning.Wherein the 4th lens L4 is used as first piece lens after diaphragm, the phase brought to compensating stop front lens
Difference has positive role, it is therefore desirable to use high-index material.
Understand above, by this wide-angle lens of the present embodiment, can be in strict control CRA, the correction curvature of field, reduction system
System volume while, effectively program for correcting phase difference, reduces cost, improve image quality.
Embodiment three
It is explanation that emphasis is done to the face type on two surfaces of the 6th lens L6 of wide-angle lens in the present embodiment, other
Content is referring to other embodiment of the present utility model.Wide-angle lens of the present utility model, the 6th lens L6 is near the 7th lens L7
Surface be sphere.
So in wide-angle lens system of the present utility model, only two surfaces of the 7th lens L7, can for aspherical
CRA to any visual field is strictly controlled within the specific limits, and the margin of tolerance is ± 0.2 °, for example, θ is maximum field of view
CRA, when full filed is 29.8 °, aspherical by last one side, i.e., the 7th lens L7 may be such that CRA near the surface of image space
Precise control is carried out in the range of 29.8 ± 3 ° but MTF (modulation transfer function) is not influenceed, and it passes through to control the curvature of field can also
Increase mtf value.So as to relatively low cost and system complexity, realize control CRA, the correction curvature of field, reduce system bulk, effectively
The purposes such as ground program for correcting phase difference, reduces cost, raising image quality.
Example IV
It is explanation that emphasis is done to the face type on two surfaces of the 6th lens L6 of wide-angle lens in the present embodiment, other
Content is referring to other embodiment of the present utility model.Wide-angle lens of the present utility model, the 6th lens L6 is near the 7th lens L7
Surface for aspherical.It is as shown in Figure 3 a kind of maximum field of view's angle signal of wide-angle lens of the utility model one embodiment
Figure, is respectively the curvature of field, spherical aberration and the lateral chromatic aberration of a kind of wide-angle lens of the utility model one embodiment shown in Fig. 4 to Fig. 6
Difference figure.Wherein, the abscissa of Fig. 4 represents distance, and unit is mm, and ordinate represents visual field, and unit is mm, every curve generation
Table its corresponding wavelength, is from zero visual field to the corresponding different wave length of full filed with show that aberration size cases, i.e. Fig. 4 represent
Visual field bends situation；The abscissa of Fig. 5 represents spherical aberration value, and unit is mm, and ordinate represents aperture value, and unit is mm；The horizontal stroke of Fig. 6
Coordinate represents lateral chromatism difference, unit for μm, ordinate represents visual field.
It should be noted that the 6th lens L6 can be sphere, or aspherical near the surface of the 7th lens L7；
When being aspherical, can be higher to CRA tolerances, it is ± 0.1 °.As shown in following table one to table three,
Table one
" 1 " in table one in the 1st row represents the first lens L1 of wide-angle lens near the surface of light incident direction, " 2 "
The first lens L1 is represented near the surface of the second lens L2, " 3 " represent the second lens L2 near the surface of the first lens L1, " 4 "
The first lens L2 is represented near the surface ... of the 3rd lens L3.
Table two
The 1st row in table two represent the 6th lens L6 of wide-angle lens near the surface of the 7th lens L7, and the 7th saturating
Two surfaces of mirror L7 are high order aspheric surface, and the 2-7 row in table two represent high order aspheric surface coefficient, correspondence high order aspheric surface side
Journey formula.
Table three
Understand above, this wide-angle lens of the present embodiment can be required in strict conformity with CRA, 0.1 ° of tolerance+.System is joined
Number is described in detail below：(1) 0.7inch display chips are coordinated to realize 130 ° of angles of visual field, and each visual field has strict to CRA
It is required that, can be gone to optimize according to difference；(2) lateral chromatic aberration is less than 8um；(3) system transter is in 223lp/mm0.3
More than 0.6,0.8 visual field is reached within visual field more than 0.3；(4) visible light wave range (450nm-610nm) blur-free imaging is realized.
Embodiment five
It is aspherical done explanation of the emphasis to wide-angle lens in the present embodiment, other guide is referring to of the present utility model
Other embodiment.Wide-angle lens of the present utility model, it is aspherical below the aspherical satisfaction of the 7th lens L7 or the 6th lens L6
Equation formulations：
Wherein, z is that, along the coordinate of optical axis direction, Y is the radial coordinate in units of length of lens unit, and c=1/R, c are
Curvature, R is radius of curvature, and k is circular cone coefficient, αiIt is the coefficient of each high-order term, 2i is aspherical power high, and i takes natural number.
It should be noted that preferably, i=5 or i=6, i represent most high-order term, if i=6, then it represents that most high-order term
It is 12 times, i=7 or i=8 or higher, then it is 14 times, 16 times or more high order to represent multinomial most high-order term, but is typically come
Say 14 times, 16 times or more high-order term influences smaller to image quality, it is therefore preferred that i=5 or i=6.
Embodiment six
It is explanation that emphasis is done to the focal length of the first lens L7 of lens L1 to the 7th of wide-angle lens in the present embodiment, its
His content is referring to other embodiment of the present utility model.Wide-angle lens of the present utility model, the focal length f1 of the first lens L1 for-
The focal length f2 of 2.17mm ± 0.5mm, the second lens L2 is 7.2mm ± 0.5mm, the focal length f3 of the 3rd lens L3 for 3.86mm ±
The focal length f4 of 0.5mm, the 4th lens L4 is 3.25mm ± 0.5mm, the focal length f56 of the lens L5 of glued mirror the 5th and the 6th lens L6
It is 6.9mm ± 0.5mm, the focal length f7 of the 7th lens L7 is 43mm ± 0.5mm.
It should be noted that the focal length of each lens can be adjusted according to the cooperation between each eyeglass.
Embodiment seven
It is explanation that emphasis is done to the system focal length of wide-angle lens in the present embodiment, other guide is referring to the utility model
Other embodiment.Wide-angle lens of the present utility model, system focal length F meets relationship below：1.7445mm/F#2.4.
It should be noted that # represents number, i.e. F numbers or referred to as F-number.
Embodiment eight
It is explanation that emphasis is done to the system focal length of wide-angle lens in the present embodiment, other guide is referring to the utility model
Other embodiment.Wide-angle lens of the present utility model, the first lens L1 is made of BaK2 materials.So as to the thing with stabilization
Physicochemical property, can play a protective role to whole system.
In sum, wide-angle lens of the present utility model, first, multiple lens of wide-angle lens system forward part are all adopted
With spheric glass, last lens is only set to aspherical lens, or according to system complexity and the imaging matter of requirement
Amount requires, is only simultaneously set to aspherical by the last of penultimate lens simultaneously, i.e., set aspherical before image planes, so that
The complexity all using aspherical lens can either be avoided, can realize strictly controlling CRA again, additionally it is possible to according to different requirements
CRA is optimized, while the curvature of field can be corrected so that lateral chromatic aberration is small, can be clear in visible light wave range (450nm-610nm)
Clear imaging, is not only suitable for imaging system, and suitable for optical projection system.
Secondly, diaphragm is arranged between the 3rd lens and the 4th lens, the 3rd lens and the 4th lens are disposed as two
Individual surface concaves towards the sphere positive lens of diaphragm so that the 4th lens have actively work to the difference that compensating stop front lens brings
With, can effectively correct coma, chromatic longitudiinal aberration and off-axis aberration etc. difference；First lens are made of BaK2 materials, with steady
Fixed physicochemical properties, can play a protective role to whole system；The glued positive lens energy of the 5th lens and the 6th lens
Enough play a part of good correcting chromatic aberration.
In addition, last a piece of aspherical lens can select injection moulding, and glass or plastic material can be used, unless
Outside the lens surface of sphere, the lens surface of remaining sphere is all easily worked, cheap, and the utility model overall structure is anti-
Long distance type wide-angle structure, compact overall structure can be realized being strict with the CRA of each visual field.
Preferred embodiment of the present utility model is the foregoing is only, protection model of the present utility model is not intended to limit
Enclose.All any modification, equivalent substitution and improvements made within spirit of the present utility model and principle etc., are all contained in this reality
With in new protection domain.
Claims (10)
1. a kind of wide-angle lens, it is characterised in that including the first lens (L1), second saturating set gradually along light incident direction
Mirror (L2), the 3rd lens (L3), diaphragm (L0), the 4th lens (L4), the 5th lens (L5), the 6th lens (L6) and the 7th lens
(L7)；
First lens (L1) are the sphere negative lens that two surfaces are convex to object space；
Second lens (L2) are the sphere positive lens that two surfaces are convex to object space；
3rd lens (L3) are the sphere positive lens that two surfaces are convex to object space；
4th lens (L4) are the sphere positive lens that two surfaces are convex to image space；
5th lens (L5) and the 6th lens (L6) are glued positive lens, and the 5th lens (L5) are spherical mirror, the 6th lens (L6)
It is sphere near the surface of the 5th lens (L5)；
7th lens (L7) are aspherical positive lens.
2. wide-angle lens as claimed in claim 1, it is characterised in that the refractive index Nd1 and Abbe number Vd1 of the first lens (L1)
Relationship below is met respectively:
1.5<Nd1<1.6,55<Vd1<65；
The refractive index Nd2 and Abbe number Vd2 of the second lens (L2) meet relationship below respectively:
1.64<Nd2<1.74,50<Vd2<60；
The refractive index Nd3 and Abbe number Vd3 of the 3rd lens (L3) meet relationship below respectively:
1.6<Nd3<1.7,46<Vd3<56；
The refractive index Nd4 and Abbe number Vd4 of the 4th lens (L4) meet relationship below respectively:
1.8<Nd4<1.88,41<Vd4<50；
The refractive index Nd5 and Abbe number Vd5 of the 5th lens (L5) meet relationship below respectively:
1.72<Nd5<1.81,40<Vd5<55,
The refractive index Nd6 and Abbe number Vd6 of the 6th lens (L6) meet relationship below respectively:
1.7<Nd6<1.78,25<Vd6<40；
The refractive index Nd7 and Abbe number Vd7 of the 7th lens (L7) meet relationship below respectively:
1.55<Nd7<1.7,50<Vd7<83.
3. wide-angle lens as claimed in claim 1, it is characterised in that the 6th lens (L6) are near the surface of the 7th lens (L7)
It is sphere.
4. wide-angle lens as claimed in claim 1, it is characterised in that the 6th lens (L6) are near the surface of the 7th lens (L7)
For aspherical.
5. the wide-angle lens as any one of claim 1-4, it is characterised in that the 7th lens (L7) or the 6th lens
(L6) aspherical meets following aspherical equation formula：
Wherein, z is that, along the coordinate of optical axis direction, Y is the radial coordinate in units of length of lens unit, and c=1/R, c are song
Rate, R is radius of curvature, and k is circular cone coefficient, αiIt is the coefficient of each high-order term, 2i is aspherical power high, and i takes natural number.
6. wide-angle lens as claimed in claim 5, it is characterised in that i=5 or i=6.
7. the wide-angle lens as any one of claim 1-4, it is characterised in that the focal length f1 of the first lens (L1) for-
2.17mm ± 0.5mm, the focal length f2 of the second lens (L2) is 7.2mm ± 0.5mm, and the focal length f3 of the 3rd lens (L3) is 3.86mm
± 0.5mm, the focal length f4 of the 4th lens (L4) is 3.25mm ± 0.5mm, the lens (L5) of glued mirror the 5th and the 6th lens (L6)
Focal length f56 be 6.9mm ± 0.5mm, the focal length f7 of the 7th lens (L7) is 43mm ± 0.5mm.
8. wide-angle lens as claimed in claim 7, it is characterised in that the system focal length F of wide-angle lens meets relationship below：
1.7445mm/F#2.4。
9. the wide-angle lens as any one of claim 1-4, it is characterised in that the 7th lens (L7) use glass system
Into, or be made of injection molding.
10. the wide-angle lens as any one of claim 1-4, it is characterised in that the first lens (L1) use BaK2 materials
Material is made.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621212742.1U CN206282021U (en) | 2016-11-10 | 2016-11-10 | A kind of wide-angle lens |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621212742.1U CN206282021U (en) | 2016-11-10 | 2016-11-10 | A kind of wide-angle lens |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106405799A (en) * | 2016-11-10 | 2017-02-15 | 歌尔科技有限公司 | Wide-angle camera lens |
| CN109491049A (en) * | 2018-12-26 | 2019-03-19 | 歌尔股份有限公司 | Projection optical system and augmented reality glasses with it |
-
2016
- 2016-11-10 CN CN201621212742.1U patent/CN206282021U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106405799A (en) * | 2016-11-10 | 2017-02-15 | 歌尔科技有限公司 | Wide-angle camera lens |
| CN109491049A (en) * | 2018-12-26 | 2019-03-19 | 歌尔股份有限公司 | Projection optical system and augmented reality glasses with it |
| CN109491049B (en) * | 2018-12-26 | 2023-08-29 | 歌尔光学科技有限公司 | Projection optical system and augmented reality glasses with same |
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Effective date of registration: 20201014 Address after: 261031 north of Yuqing street, east of Dongming Road, high tech Zone, Weifang City, Shandong Province (Room 502, Geer electronic office building) Patentee after: GoerTek Optical Technology Co.,Ltd. Address before: 266104 Laoshan Qingdao District North House Street investment service center room, Room 308, Shandong Patentee before: GOERTEK TECHNOLOGY Co.,Ltd. |