CN206757169U - A kind of wide-angle lens - Google Patents
A kind of wide-angle lens Download PDFInfo
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- CN206757169U CN206757169U CN201720548716.4U CN201720548716U CN206757169U CN 206757169 U CN206757169 U CN 206757169U CN 201720548716 U CN201720548716 U CN 201720548716U CN 206757169 U CN206757169 U CN 206757169U
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Abstract
This application discloses wide-angle lens, including the first lens group, aperture member and the second lens group being arranged in order by thing side to image side；First lens group has negative power, including the first spherical lens, and thing side is convex surface, image side surface is concave surface；Second spherical lens, thing side is convex surface, image side surface is concave surface；3rd spherical lens, thing side and image side surface are concave surface；4th spherical lens, thing side and image side surface are convex surface；5th spherical lens, thing side and image side surface are convex surface；6th balsaming lens, formed by the 6th spherical lens and the 7th spherical lens gluing, the thing side of the 6th spherical lens is convex surface, image side surface is concave surface, and the thing side of the 7th spherical lens is convex surface；Second lens group has positive light coke, including：8th spherical lens, thing side and image side surface are convex surface；9th spherical lens, thing side is concave surface, image side surface is convex surface.The wide-angle lens can reduce difficulty of processing, reduce manufacturing cost.
Description
Technical field
The application is related to optical field, and in particular to optical imaging system technical field, more particularly to a kind of wide-angle lens.
Background technology
With the continuous development of optical design techniques and the continuous expansion of pick-up lens application field, wide-angle, high-resolution,
The pick-up lens of miniaturization is becoming increasingly popular.Such as some safety monitoring equipment, vehicle-mounted camera-shooting and recording device, motion DV equipment, void
The pick-up lens intended in real world devices needs higher resolution ratio, the less volume of the larger angle of visual field.
In existing some wide-angle lens design, in order to reduce the volume of camera lens, generally designed in optical system
Non-spherical lens reduces aberration, lifts image quality.But the difficulty of processing of non-spherical lens is larger, cost of manufacture is high, and
And some are affected by environment larger for material (such as the molded plastic material) performance for making non-spherical lens so that wide-angle lens
The stability of the performance of head is affected.
Utility model content
In order to solve one or more technical problems that above-mentioned background section is mentioned, the embodiment of the present application provides one
Kind wide-angle lens.
The wide-angle lens that the embodiment of the present application provides includes the first lens group, the diaphragm member being arranged in order by thing side to image side
Part and the second lens group；First lens group has negative power, including be arranged in order along thing side to image side direction：With negative
First spherical lens of focal power, the thing side of the first spherical lens is convex surface, the image side surface of the first spherical lens is concave surface；Tool
There is the second spherical lens of negative power, the thing side of the second spherical lens is convex surface, the image side surface of the second spherical lens is recessed
Face；The 3rd spherical lens with negative power, the thing side of the 3rd spherical lens and image side surface are concave surface；With positive light focus
4th spherical lens of degree, the thing side of the 4th spherical lens and image side surface are convex surface；The 5th sphere with positive light coke
Lens, the thing side of the 5th spherical lens and image side surface are convex surface；The 6th balsaming lens with positive light coke, by the 6th ball
Face lens and the 7th spherical lens gluing form, and the thing side of the 6th spherical lens is convex surface, the image side surface of the 6th spherical lens
For concave surface, the thing side of the 7th spherical lens is convex surface；Second lens group has a positive light coke, including along thing side to image side direction
It is arranged in order：The 8th spherical lens with positive light coke, the thing side of the 8th spherical lens and image side surface are convex surface；Tool
There is the 9th spherical lens of negative power, the thing side of the 9th spherical lens is concave surface, and the image side surface of the 9th spherical lens is convex
Face.
In certain embodiments, above-mentioned wide-angle lens meets：10≤TTL/F0≤12；5.5≤TTL/F10≤8.5；0.8
≤TTL/F20≤3.5；Wherein, TTL be wide-angle lens optics overall length, F0 be wide-angle lens effective focal length, F10 first
The effective focal length of lens group, F20 are the effective focal length of the second lens group.
In a further embodiment, TTL=23mm, F0=2.036mm.
In a further embodiment, 1/F10+1/F20=0.396.
In certain embodiments, above-mentioned wide-angle lens meets：3.5 ＜ F1/F0 ＜ 5.5；- 1.5 ＜ F123/F0 ＜ -0.5；
0.9 ＜ F10/F0 ＜ 2.5；4 ＜ F20/F0 ＜ 9；Wherein, F0 is the effective focal length of wide-angle lens, and F1 is the first spherical lens
Effective focal length, F10 are the effective focal length of the first lens group, and F20 is the effective focal length of the second lens group, and F123 is that the first sphere is saturating
Mirror, the second spherical lens, the 3rd spherical lens combination effective focal length.
In certain embodiments, refractive index n1, second sphere of first spherical lens to wavelength for 587.56nm light
The refraction for the light that refractive index n2, the 3rd spherical lens for the light that lens are 587.56nm to wavelength are 587.56nm to wavelength
Rate n3 meets：The ＜ n3 ＜ 1.86 of 1.8 ＜ n1 ＜, 1.86,1.8 ＜ n2 ＜ 1.86,1.8；First spherical lens is to wavelength
Abbe number v2, threeth balls of the Abbe number v1, the second spherical lens of 587.56nm light to wavelength for 587.56nm light
Face lens meet to the Abbe number v3 for the light that wavelength is 587.56nm：The ＜ v3 ＜ 50 of 35 ＜ v1 ＜, 50,35 ＜ v2 ＜ 50,35.
In certain embodiments, refractive index n4, fiveth sphere of the 4th spherical lens to wavelength for 587.56nm light
The refraction for the light that refractive index n5, the 6th spherical lens for the light that lens are 587.56nm to wavelength are 587.56nm to wavelength
Rate n6 meets：N4 ＞ 1.78, n5 ＞ 1.78, n6 ＞ 1.78；Abbe of 4th spherical lens to wavelength for 587.56nm light
Count v4, Abbe number v5, the 6th spherical lens of the light that the 5th spherical lens is 587.56nm to wavelength are to wavelength
The Abbe number v6 of 587.56nm light meets：V4 ＜ 35v5 ＜ 35, v6 ＜ 35.
In certain embodiments, the diopter of the 8th spherical lens is 1/F21,1/F21=0.184.
In certain embodiments, the refractive index n9 and Abbe number v9 of the 9th spherical lens meet：N9 ＞ 1.9, v9 ＜ 20.
In certain embodiments, above-mentioned wide-angle lens also includes optical filter, and optical filter is located at the image side of the second lens group.
The wide-angle lens that the embodiment of the present application provides, the optical system formed using the first to the 9th spherical lens are realized
The big angle of visual field, the lens design of high imaging quality, the difficulty of processing of wide-angle lens can be reduced, reduce manufacturing cost.
Brief description of the drawings
Non-limiting example is described in detail with reference to what the following drawings was made by reading, other features,
Objects and advantages will become more apparent upon：
Fig. 1 is a structural representation according to the wide-angle lens of the embodiment of the present application；
Fig. 2 is the modulation transfer function curve synoptic diagram of the wide-angle lens of the embodiment of the present application.
Embodiment
The application is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining relevant utility model, rather than the restriction to the utility model.Further need exist for illustrating
, for the ease of description, illustrate only in accompanying drawing to about the related part of utility model.
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can phase
Mutually combination.Describe the application in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
Fig. 1 is refer to, it illustrates the wide-angle lens according to the embodiment of the present application a structural representation.
As shown in figure 1, wide-angle lens 100 includes first be arranged in order as thing side to image side (direction of arrow shown in Fig. 1)
Lens group 10, the lens group 20 of aperture member 30 and second.Wherein, the first lens group 10 has a negative power, including along thing side
The first spherical lens 1, the second spherical lens 2, the 3rd spherical lens being arranged in order to image side direction (direction of arrow shown in Fig. 1)
3rd, the 4th spherical lens 4, the 5th spherical lens 5 and the 6th balsaming lens 60；Second lens group 20 has positive light coke, including edge
The 8th spherical lens 8 and the 9th spherical lens 9 that thing side to image side direction (direction of arrow shown in Fig. 1) is arranged in order.
First spherical lens 1 has negative power, can be the meniscus shaped lens for being convex to thing side, i.e. the first spherical lens
Thing side is convex surface, and image side surface is concave surface.Second spherical lens 2 also has negative power, can be the falcate for being convex to thing side
Lens, i.e. the thing side of the second spherical lens 2 and image side surface are concave surface.3rd spherical lens 3 has negative power, its thing side
It is concave surface with image side surface.4th spherical lens 4 has positive light coke, and the thing side of the 4th spherical lens 4 and image side surface are
Convex surface.5th spherical lens 5 has positive light coke, and the thing side of the 5th spherical lens 5 and image side surface are convex surface.6th glue
Closing lens 60 has positive light coke, is formed by the 6th spherical lens 6 and the gluing of the 7th spherical lens 7, wherein, the 6th spherical lens
6 thing side is convex surface, and the image side surface of the 6th spherical lens 6 is concave surface, and the thing side of the 7th spherical lens 7 is convex surface, the 7th
The image side surface of spherical lens 7 can be plane, convex surface or concave surface, the image side surface of the 6th spherical lens 6 and the 7th spherical lens 7
Thing side is mutually glued.8th spherical lens 8 has positive light coke, and its thing side and image side surface are convex surface.9th spherical lens 9
With negative power, its thing side is concave surface, and image side surface is convex surface.Above-mentioned first to the 9th spherical lens coaxial design.
In the present embodiment, the optical system being made up of above-mentioned first lens group 10, the second lens group 20 and aperture member 30
System has the larger angle of visual field, and the angle of visual field can reach more than 160 °, and all lens in the optical system are spherical lens,
The process technology of spherical lens is ripe, technique popularization, and cost is relatively low；Meanwhile the glass material for making spherical lens has
Good thang-kng performance, its operating temperature range is wide, and small, stable work in work is influenceed by environment.It is in addition, saturating by the 6th sphere
The 6th balsaming lens 60 that mirror 6 and the gluing of the 7th spherical lens 7 form can effective aberration correction, the above-mentioned first to the 9th sphere
The combination of lens can optimize all kinds of aberrations while the big angle of visual field is realized, obtain good image quality.
In certain embodiments, above-mentioned fish eye lens also includes optical filter 40, and it is saturating that the optical filter 40 can be arranged at second
The image side of microscope group 20, can be cutoff filter or smalt.
In certain embodiments, above-mentioned wide-angle lens meets：10≤TTL/F0≤12；5.5≤TTL/F10≤8.5；0.8
≤TTL/F20≤3.5；Wherein, TTL be wide-angle lens optics overall length, F0 be wide-angle lens effective focal length, F10 first
The effective focal length of lens group, F20 are the effective focal length of the second lens group.The wide-angle lens can not only have the larger angle of visual field,
Its appearance and size will not be excessive simultaneously, can be with all kinds of aberrations of active balance, so as to improve the image quality of wide-angle lens.
Alternatively, TTL=23mm, F0=2.036mm.Meet that the wide-angle lens optics overall length of the condition is smaller, profile chi
It is very little smaller, and effective focal length is that 2.036mm can ensure that wide-angle lens has the sufficiently large angle of visual field.
In certain embodiments, 1/F10+1/F20=0.396.Wherein, 1/F10 can represent the dioptric of the first lens group
Degree, 1/F20 can represent the diopter of the second lens group.Meet the lens group of wide-angle camera first and the second lens of the condition
The diopter of group is smaller so that the manufacture susceptibility of each lens is relatively low, is advantageous to further reduce production and processing cost.
In certain embodiments, above-mentioned wide-angle lens meets：3.5 ＜ F1/F0 ＜ 5.5；- 1.5 ＜ F123/F0 ＜ -0.5；
0.9 ＜ F10/F0 ＜ 2.5；4 ＜ F20/F0 ＜ 9；Wherein, F0 is the effective focal length of wide-angle lens, and F1 is the first spherical lens
Effective focal length, F10 are the effective focal length of the first lens group, and F20 is the effective focal length of the second lens group, and F123 is that the first sphere is saturating
Mirror, the second spherical lens, the 3rd spherical lens combination effective focal length.Alternatively, F123=-1.667mm.So, wide-angle
Focal power can be distributed reasonably between each lens group in camera lens, so as to preferably balance all kinds of aberrations of wide-angle lens.
Specifically, the effective focal length of the first spherical lens, the first lens group and the effective focal length of whole wide-angle lens differ greatly, can
So that the first spherical lens and the first lens group have sufficiently large imaging surface, the first spherical lens, the second spherical lens, the 3rd
Difference between the effective focal length of the combination of spherical lens and the effective focal length of whole wide-angle lens is smaller, and the second spherical lens
Effective focal length and whole wide-angle lens effective focal length between difference it is smaller, can have whole wide-angle lens sufficiently large
Visual field, while aberration can be reduced.
In certain embodiments, refractive index n1, second sphere of first spherical lens to wavelength for 587.56nm light
The refraction for the light that refractive index n2, the 3rd spherical lens for the light that lens are 587.56nm to wavelength are 587.56nm to wavelength
Rate n3 meets：The ＜ n3 ＜ 1.86 of 1.8 ＜ n1 ＜, 1.86,1.8 ＜ n2 ＜ 1.86,1.8；First spherical lens is to wavelength
Abbe number v2, threeth balls of the Abbe number v1, the second spherical lens of 587.56nm light to wavelength for 587.56nm light
Face lens meet to the Abbe number v3 for the light that wavelength is 587.56nm：The ＜ v3 ＜ 50 of 35 ＜ v1 ＜, 50,35 ＜ v2 ＜ 50,35.
Alternatively, the first spherical lens, the second spherical lens, the material of the 3rd spherical lens are identical, such as are small bare glass.Meet
The first spherical lens, the second spherical lens and the 3rd spherical lens of the condition can ensure that light is effectively assembled, and the
One spherical lens, the second spherical lens, the Abbe number of the 3rd spherical lens are larger, can effectively reduce dispersion, improve " purple boundary "
Phenomenon.
In certain embodiments, refractive index n4, fiveth sphere of the 4th spherical lens to wavelength for 587.56nm light
The refraction for the light that refractive index n5, the 6th spherical lens for the light that lens are 587.56nm to wavelength are 587.56nm to wavelength
Rate n6 meets：N4 ＞ 1.78, n5 ＞ 1.78, n6 ＞ 1.78；Abbe of 4th spherical lens to wavelength for 587.56nm light
Count v4, Abbe number v5, the 6th spherical lens of the light that the 5th spherical lens is 587.56nm to wavelength are to wavelength
The Abbe number v6 of 587.56nm light meets：V4 ＜ 35v5 ＜ 35, v6 ＜ 35.
In certain embodiments, the diopter of above-mentioned 8th spherical lens is 1/F21,1/F21=0.184.Above-mentioned 9th
The refractive index n9 and Abbe number v9 of spherical lens can meet：N9 ＞ 1.9, v9 ＜ 20.The diopter of 8th spherical lens compared with
It is small, the first lens group can be coordinated to be corrected aberration.9th spherical lens can be with high index of refraction, low Abbe number
Dense flint material, large angle incidence light can be made effectively to assemble, and coordinate the first lens group to be corrected aberration.
Above as can be seen that each lens are spherical lens in the wide-angle lens that the embodiment of the present application provides, by each
Microscope group, which is closed, to be come to aberration correction, realizes the big angle of visual field, high imaging quality, low cost and the strong lens design of stability.
Also, in certain embodiments, the optics overall length of wide-angle lens can be about 23mm, make the whole optical system of wide-angle lens
Excessive space will not be taken, and its imaging surface is larger, can be used cooperatively with large-sized imaging detector.
Fig. 2 shows modulation transfer function (the Modulation Transfer of the wide-angle lens of the embodiment of the present application
Function, MTF) curve synoptic diagram.Wherein the longitudinal axis represents mtf value, and value is between 0-1；Transverse axis is resolution ratio, and unit is
Lp/mm (line right/millimeter).The curve of 0.7 visual field (T) and 0.7 visual field (S) represents that the maximum angle of incident ray is maximum respectively
The MTF curve of meridian direction and the MTF curve in the sagitta of arc direction at 0.7 times of the angle of visual field, 1.0 visual fields (T) and 1.0 visual fields (S)
Curve represent MTF curve and the sagitta of arc direction of meridian direction when the maximum angle of incident ray is maximum field of view angle respectively
MTF curve.MTF value represents that the imaging of camera lens is closer with actual object, image quality is better closer to 1.
Figure it is seen that the rate of decay that mtf value rises with resolution ratio is smaller, when resolution ratio reaches 270lp/mm,
The mtf value of each visual field is all higher than 0.3, it was demonstrated that the wide-angle lens that the embodiment of the present application provides has good imaging performance.
Above description is only the preferred embodiment of the application and the explanation to institute's application technology principle.People in the art
Member should be appreciated that utility model scope involved in the application, however it is not limited to what the particular combination of above-mentioned technical characteristic formed
Technical scheme, while should also cover in the case where not departing from the design of above-mentioned utility model, by above-mentioned technical characteristic or its be equal
Other technical schemes that feature is combined and formed.Such as features described above has with (but not limited to) disclosed herein
The technical scheme that the technical characteristic for having similar functions is replaced mutually and formed.
Claims (10)
- A kind of 1. wide-angle lens, it is characterised in that including be arranged in order by thing side to image side the first lens group, aperture member with And second lens group；First lens group has negative power, including be arranged in order along thing side to image side direction：The first spherical lens with negative power, the thing side of first spherical lens is convex surface, first sphere is saturating The image side surface of mirror is concave surface；The second spherical lens with negative power, the thing side of second spherical lens is convex surface, second sphere is saturating The image side surface of mirror is concave surface；The 3rd spherical lens with negative power, the thing side of the 3rd spherical lens and image side surface are concave surface；The 4th spherical lens with positive light coke, the thing side of the 4th spherical lens and image side surface are convex surface；The 5th spherical lens with positive light coke, the thing side of the 5th spherical lens and image side surface are convex surface；The 6th balsaming lens with positive light coke, is formed by the 6th spherical lens and the 7th spherical lens gluing, and the described 6th The thing side of spherical lens is convex surface, and the image side surface of the 6th spherical lens is concave surface, the thing side of the 7th spherical lens Face is convex surface；Second lens group has positive light coke, including be arranged in order along thing side to image side direction：The 8th spherical lens with positive light coke, the thing side of the 8th spherical lens and image side surface are convex surface；The 9th spherical lens with negative power, the thing side of the 9th spherical lens is concave surface, and the 9th sphere is saturating The image side surface of mirror is convex surface.
- 2. wide-angle lens according to claim 1, it is characterised in that the wide-angle lens meets：10≤TTL/F0≤12；5.5≤TTL/F10≤8.5；0.8≤TTL/F20≤3.5；Wherein, TTL is the optics overall length of the wide-angle lens, and F0 is the effective focal length of the wide-angle lens, and F10 is described first The effective focal length of lens group, F20 are the effective focal length of second lens group.
- 3. wide-angle lens according to claim 2, it is characterised in that TTL=23mm, F0=2.036mm.
- 4. wide-angle lens according to claim 2, it is characterised in that 1/F10+1/F20=0.396.
- 5. wide-angle lens according to claim 1, it is characterised in that the wide-angle lens meets：3.5 ＜ F1/F0 ＜ 5.5；- 1.5 ＜ F123/F0 ＜ -0.5；0.9 ＜ F10/F0 ＜ 2.5；4 ＜ F20/F0 ＜ 9；Wherein, F0 is the effective focal length of the wide-angle lens, and F1 is the effective focal length of first spherical lens, and F10 is described The effective focal length of first lens group, F20 are the effective focal length of second lens group, and F123 is first spherical lens, institute State the second spherical lens, the 3rd spherical lens combination effective focal length.
- 6. wide-angle lens according to claim 1, it is characterised in that first spherical lens is 587.56nm to wavelength The refractive index n1 of light, second spherical lens is to refractive index n2, the 3rd ball of light that wavelength is 587.56nm Face lens meet to the refractive index n3 for the light that wavelength is 587.56nm：The ＜ of 1.8 ＜ n1 ＜, 1.86,1.8 ＜ n2 ＜ 1.86,1.8 N3 ＜ 1.86；The Abbe number v1 for the light that first spherical lens is 587.56nm to wavelength, second spherical lens are to wavelength The Abbe number v2 of 587.56nm light, the 3rd spherical lens are expired to the Abbe number v3 for the light that wavelength is 587.56nm Foot：The ＜ v3 ＜ 50 of 35 ＜ v1 ＜, 50,35 ＜ v2 ＜ 50,35.
- 7. wide-angle lens according to claim 1, it is characterised in that the 4th spherical lens is 587.56nm to wavelength The refractive index n4 of light, the 5th spherical lens is to refractive index n5, the 6th ball of light that wavelength is 587.56nm Face lens meet to the refractive index n6 for the light that wavelength is 587.56nm：N4 ＞ 1.78, n5 ＞ 1.78, n6 ＞ 1.78；Abbe number v4, the 5th spherical lens for the light that 4th spherical lens is 587.56nm to wavelength be to wavelength The Abbe number v5 of 587.56nm light, the 6th spherical lens are expired to the Abbe number v6 for the light that wavelength is 587.56nm Foot：V4 ＜ 35v5 ＜ 35, v6 ＜ 35.
- 8. wide-angle lens according to claim 1, it is characterised in that the diopter of the 8th spherical lens is 1/F21, 1/F21=0.184.
- 9. wide-angle lens according to claim 1, it is characterised in that the refractive index n9 and Abbe of the 9th spherical lens Number v9 meets：N9 ＞ 1.9, v9 ＜ 20.
- 10. according to the wide-angle lens described in claim any one of 1-9, it is characterised in that the wide-angle lens also includes filtering Piece, the optical filter are located at the image side of second lens group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201720548716.4U CN206757169U (en) | 2017-05-17 | 2017-05-17 | A kind of wide-angle lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720548716.4U CN206757169U (en) | 2017-05-17 | 2017-05-17 | A kind of wide-angle lens |
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| CN206757169U true CN206757169U (en) | 2017-12-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109975950A (en) * | 2017-12-27 | 2019-07-05 | 宁波舜宇车载光学技术有限公司 | Optical lens |
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2017
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109975950A (en) * | 2017-12-27 | 2019-07-05 | 宁波舜宇车载光学技术有限公司 | Optical lens |
| CN109975950B (en) * | 2017-12-27 | 2021-06-04 | 宁波舜宇车载光学技术有限公司 | Optical lens |
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