CN207992544U - A kind of fixed-focus imaging lens - Google Patents
A kind of fixed-focus imaging lens Download PDFInfo
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- CN207992544U CN207992544U CN201820526237.7U CN201820526237U CN207992544U CN 207992544 U CN207992544 U CN 207992544U CN 201820526237 U CN201820526237 U CN 201820526237U CN 207992544 U CN207992544 U CN 207992544U
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- lens
- focal length
- balsaming
- convex
- object side
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Abstract
The utility model is related to a kind of fixed-focus imaging lens, along optical axis by object side to image side sequentially including the first concavees lens, the first convex lens.The first balsaming lens group and the second balsaming lens group are equipped with by object side to image side successively along optical axis between first concavees lens and the first convex lens；And camera lens meets following expressions：0.64<f123/f<4.0；1<f345/f<4.24；0.15<f/fB<2；In formula：F123 is the combination front focal length of the first concavees lens and the first balsaming lens group；F is the front focal length of entire lens assembly；F345 is the combination front focal length of the second balsaming lens group and the first convex lens；FB is the back focal length of whole system.The utility model is possessed relative to the longer back focal length of existing standard lens on the basis of not changing the performances such as original Lens, focal length, effective aperture, resolving power, is suitable for the use of single-lens multisensor photographic device with this.
Description
Technical field
The utility model is related to a kind of camera lens, especially a kind of fixed-focus imaging lens.
Background technology
In safety monitoring industry, it is to turn to hair with high definition, intelligence that camera is captured in fixed law enforcement especially on road
Exhibition trend.Monitoring camera on the market at present, other than traditional monocular camera, various more mesh cameras, panorama camera
Also it is rising；Application range is also not only limited to safety-security area, such as measurement, industry, handheld device etc., has and largely answers
With.The advantage of wherein more mesh cameras is it will be evident that a plurality of lenses combination can have the visual angle of bigger, better space angular resolution
Etc..Therefore, the application of multi-lens camera is inherently more next wide.
In multi-lens camera, more ocular head imagings can have space bias, this needs rear end to have corresponding algorithm process,
Image mosaic is carried out, the workload and difficulty of algorithm routine exploitation are on the one hand increased, while increasing the calculating of machine terminal
Expense.On the other hand, image will produce change in size by splicing.And it is single-lens, since the camera lens as light well only has one
A, multiple sensors share the imaging of a camera lens, in principle for imaging on each sensor be the same, reduce
The various algorithm expenses of image mosaic, it is easier to it realizes, but with the design standard of existing high definition security protection camera, rear lens focus
Generally 12.5mm ~ 13.00mm is burnt after standardized to design integrated and design and camera lens the versatility for contributing to product.
But with the intelligentized development of camera, more mesh camera schemes start to rise, and current rear lens focus limits single-lens more biographies
The application scheme of sensor, and in fact, increase rear lens focus away from while, inevitably reduce camera lens other performance
Parameter.
Utility model content
The technical problem to be solved by the utility model is to provide one kind do not change original Lens, focal length, effectively
Increase the fixed-focus imaging lens of back focal length on the basis of the performances such as aperture, resolving power.
To solve the above problems, a kind of fixed-focus imaging lens described in the utility model, along optical axis by object side to image side
Include sequentially the first concavees lens, the first convex lens, it is characterised in that：Edge between first concavees lens and first convex lens
It optical axis and the first balsaming lens group and the second balsaming lens group is equipped with by object side to image side successively；And camera lens meets following expression
Formula：
0.64 < f123/f < 4.0；
1 < f345/f < 4.24；
0.15 < f/fB < 2；
In formula：F123 is the combination front focal length of first concavees lens and the first balsaming lens group；F is entire camera lens
The front focal length of device；F345 is the combination front focal length of the second balsaming lens group and first convex lens；FB is entire system
The back focal length of system.
The curvature of the object side I of first concavees lens is -21mm ~ -20mm, the curvature of image side surface I be 36mm ~
37mm；The Refractive Index of Material of first concavees lens is 1.65 ~ 1.67.
The curvature of the object side II of first convex lens is 42mm ~ 43mm, and image side surface II is plane；First convex lens
The Refractive Index of Material of mirror is 1.63 ~ 1.65.
The first balsaming lens group includes the second convex lens and the first meniscus lens；Second convex lens and described the
Cemented surface I is equipped between one meniscus lens.
The Refractive Index of Material of second convex lens is 1.77 ~ 1.79.
The second balsaming lens group includes third convex lens and the second meniscus lens；The third convex lens and described the
Cemented surface II is equipped between two meniscus lens.
The Refractive Index of Material of the third convex lens is 1.8 ~ 1.83.
The utility model has the following advantages compared with prior art：
The utility model is in existing high definition CCTV（Closed Circuit Television）On the basis of camera lens, by excellent
Change design, on the basis of not changing the performances such as original Lens, focal length, effective aperture, resolving power, by suitably reducing
Increase camera lens effective resolution with respect to clear aperature, the curvature by optimizing back end-mirror increases back focal length, to possess phase
For the longer back focal length of existing standard lens, it is suitable for the use of single-lens multisensor photographic device with this.
Description of the drawings
Specific embodiment of the present utility model is described in further detail below in conjunction with the accompanying drawings.
Fig. 1 is the structural schematic diagram of the utility model.
In figure：The first concavees lens of S12-；The second convex lenses of S34-；The first meniscus lens of S45-；S67-third convex lens
Mirror；The second meniscus lens of S78-；The first convex lenses of S91-；1-object side I；2-image side surfaces I；3-object sides III；4-glue
Conjunction face I；5-image side surfaces III；6-object sides IV；7-cemented surfaces II；8-image side surfaces IV；9-object sides II；10-image side surfaces
Ⅱ。
Specific implementation mode
As shown in Figure 1, a kind of fixed-focus imaging lens, by object side to image side include sequentially along optical axis the first concavees lens S12,
First convex lens S91.It is equipped with the successively by object side to image side along optical axis between first concavees lens S12 and the first convex lens S91
One balsaming lens group and the second balsaming lens group；And camera lens meets following expressions：
0.64 < f123/f < 4.0；
1 < f345/f < 4.24；
0.15 < f/fB < 2；
In formula：F123 is the combination front focal length of the first concavees lens S12 and the first balsaming lens group；F is entire lens assembly
Front focal length；F345 is the combination front focal length of the second balsaming lens group and the first convex lens S91；FB is the rear coke of whole system
Away from.
Wherein：The curvature of the object side I 1 of first concavees lens S12 is -21mm ~ -20mm, and the curvature of image side surface I 2 is
36mm~37mm；The Refractive Index of Material of first concavees lens S12 is 1.65 ~ 1.67.
The curvature of the object side II 9 of first convex lens S91 is 42mm ~ 43mm, and image side surface II 10 is plane；This is first convex
The Refractive Index of Material of lens S91 is 1.63 ~ 1.65.
First balsaming lens group includes the second convex lens S34 and the first meniscus lens S45.Second convex lens S34 and first
Cemented surface I 4 is equipped between meniscus lens S45.
The Refractive Index of Material of second convex lens S34 is 1.77 ~ 1.79.
Second balsaming lens group includes third convex lens S67 and the second meniscus lens S78.Third convex lens S67 and second
Cemented surface II 7 is equipped between meniscus lens S78.
The Refractive Index of Material of third convex lens S67 is 1.8 ~ 1.83.
Camera lens front focal length 25mm, back focal length 40mm, effective thang-kng may be implemented in a kind of design scheme in embodiment
Aperture F/# is 1.8, and Imaging Resolution is more than 145lp/mm, can meet 1/1.8 inch of target surface imaging sensor.Wherein, object side
I 1 and image side surface I 2 form the first concavees lens S12, center thickness 1.6mm, the wherein curvature of object side I 1 is -20.14mm
Spherical surface, the curvature of image side surface I 2 are the spherical surface of 36.5mm.Object side III 3 and cemented surface I 4 form the second convex lens S34, and center is thick
Degree is 14.2mm, and wherein object side III 3 is the spherical surface of curvature 98.1mm, and cemented surface I 4 is the spherical surface of curvature -16.2mm.Cemented surface
I 4 and first meniscus lens S45 of the composition of image side surface III 5, center thickness 5mm, image side surface III 5 is the spherical surface of curvature -33.1mm；
Object side III 3, cemented surface I 4 and image side surface III 5 are together to form the first balsaming lens group.II 7 groups of object side IV 6 and cemented surface
At third convex lens S67, center thickness 10.8mm, wherein object side IV 6 is the spherical surface of curvature 66.1mm, and cemented surface II 7 is
The spherical surface of curvature -27.8mm, cemented surface II 7 and image side surface IV 8 form the second meniscus lens S78, center thickness 1.6mm, as
Side IV 8 is the spherical surface of curvature -105.9mm.Object side IV 6, cemented surface II 7 and image side surface IV 8 are together to form the second gluing
Lens group.Object side II 9 and image side surface II 10 form the first convex lens S91, center thickness 5.9mm, and wherein object side II 9 is
Curvature is the spherical surface of 42.2mm, and image side surface II 10 is plane.
Lens in camera lens are not limited to glass or other optical materials, and object side I 1 and image side surface I 2 form first recessed
Lens S12, ranges of indices of refraction are 1.65 ~ 1.67；The second convex lens S34 that object side III 3 and cemented surface I 4 form, refractive index model
Enclose 1.77 ~ 1.79；The third convex lens S67 that object side IV 6 and cemented surface II 7 form, ranges of indices of refraction 1.8 ~ 1.83；Object side
II 9 and image side surface II 10 form the first convex lens S91, ranges of indices of refraction is 1.63 ~ 1.65, lens imaging spectral region
400nm ~ 1100nm, design optimization key light line spectrum are 486.13nm, 587.56nm and 656.27nm.
In specific implementation process, the center thickness between the radius of curvature R of each curved surface of lens system, each curved surface
Tc, pore radius meet the condition listed by table 1：
Table 1
As shown in Table 1, the center thickness of object side I 1 and image side surface I 2 is 1.6mm, image side surface I 2 in object side III 3
Heart thickness is 9.71mm, and the center thickness of object side III 3 and cemented surface I 4 is 14.19mm, cemented surface I 4 in image side surface III 5
Heart thickness is 5mm, and the center thickness of image side surface III 5 and object side IV 6 is 16.05mm, object side IV 6 in cemented surface II 7
Heart thickness is 10.83mm, and the center thickness of cemented surface II 7 and image side surface IV 8 is 1.6mm, image side surface IV 8 and object side II 9
Center thickness is 0.1mm, and the center thickness of object side II 9 and image side surface II 10 is 5.9mm.
The refractive index of wavelength corresponding to the material of each lens of lens system meets the condition listed by table 2：
Table 2
Interface uses standard interface, compatible mainstream camera interface on the market after camera lens.Meanwhile band near camera lens rear joint
The burnt screw thread that adjusts is focused for adjusting back focal length after having machinery.All eyeglasses plate anti-reflection film, increase light passband.
Claims (7)
1. a kind of fixed-focus imaging lens, along optical axis by object side to image side sequentially including the first concavees lens（S12）, the first convex lens
（S91）, it is characterised in that：First concavees lens（S12）With first convex lens（S91）Between along optical axis by object side extremely
Image side is equipped with the first balsaming lens group and the second balsaming lens group successively；And camera lens meets following expressions：
0.64 < f123/f < 4.0；
1 < f345/f < 4.24；
0.15 < f/fB < 2；
In formula：F123 is first concavees lens（S12）With the combination front focal length of the first balsaming lens group；F is entire mirror
The front focal length of head device；F345 is the second balsaming lens group and first convex lens（S91）Combination front focal length；FB is
The back focal length of whole system.
2. a kind of fixed-focus imaging lens as described in claim 1, it is characterised in that：First concavees lens（S12）Object side
Face I（1）Curvature be -21mm ~ -20mm, image side surface I（2）Curvature be 36mm ~ 37mm；First concavees lens（S12）Material
Expect that refractive index is 1.65 ~ 1.67.
3. a kind of fixed-focus imaging lens as described in claim 1, it is characterised in that：First convex lens（S91）Object side
Face II（9）Curvature be 42mm ~ 43mm, image side surface II（10）For plane；First convex lens（S91）Refractive Index of Material be
1.63~1.65。
4. a kind of fixed-focus imaging lens as described in claim 1, it is characterised in that：The first balsaming lens group includes second
Convex lens（S34）With the first meniscus lens（S45）；Second convex lens（S34）With first meniscus lens（S45）Between
Equipped with cemented surface I（4）.
5. a kind of fixed-focus imaging lens as claimed in claim 4, it is characterised in that：Second convex lens（S34）Material
Refractive index is 1.77 ~ 1.79.
6. a kind of fixed-focus imaging lens as described in claim 1, it is characterised in that：The second balsaming lens group includes third
Convex lens（S67）With the second meniscus lens（S78）；The third convex lens（S67）With second meniscus lens（S78）Between
Equipped with cemented surface II（7）.
7. a kind of fixed-focus imaging lens as claimed in claim 6, it is characterised in that：The third convex lens（S67）Material
Refractive index is 1.8 ~ 1.83.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820526237.7U CN207992544U (en) | 2018-04-13 | 2018-04-13 | A kind of fixed-focus imaging lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820526237.7U CN207992544U (en) | 2018-04-13 | 2018-04-13 | A kind of fixed-focus imaging lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207992544U true CN207992544U (en) | 2018-10-19 |
Family
ID=63831683
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820526237.7U Expired - Fee Related CN207992544U (en) | 2018-04-13 | 2018-04-13 | A kind of fixed-focus imaging lens |
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| Country | Link |
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| CN (1) | CN207992544U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110376709A (en) * | 2018-04-13 | 2019-10-25 | 甘肃智呈网络科技有限公司 | A kind of fixed-focus imaging lens |
-
2018
- 2018-04-13 CN CN201820526237.7U patent/CN207992544U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110376709A (en) * | 2018-04-13 | 2019-10-25 | 甘肃智呈网络科技有限公司 | A kind of fixed-focus imaging lens |
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| CF01 | Termination of patent right due to non-payment of annual fee |