CN209311774U - A kind of telecentric lens - Google Patents
A kind of telecentric lens Download PDFInfo
- Publication number
- CN209311774U CN209311774U CN201920113721.1U CN201920113721U CN209311774U CN 209311774 U CN209311774 U CN 209311774U CN 201920113721 U CN201920113721 U CN 201920113721U CN 209311774 U CN209311774 U CN 209311774U
- Authority
- CN
- China
- Prior art keywords
- lens
- focal length
- relational expression
- telecentric
- optical system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Lenses (AREA)
Abstract
The utility model belongs to technical field of machine vision, more particularly to a kind of telecentric lens, including mechanical system and the optical system being installed on inside the mechanical system, the first lens G1 with positive light coke and biconvex structure that the optical system is set gradually by object end to image planes, the second lens G2 with negative power and bent moon structure, the third lens G3 with positive light coke and biconvex structure, the 4th lens G4 with negative power and double-concave structure, prism, the 5th lens G5 with positive light coke and the 6th lens G6 with positive light coke and double-concave structure, the second lens G2, the third lens G3 and the 4th lens G4 is successively glued to form balsaming lens group U1.The utility model realizes under high magnification still resolution ratio with higher and lower tolerance sensitivities, while having superior image quality, which is readily produced by above structure.
Description
Technical field
The utility model belongs to technical field of machine vision, and in particular to a kind of telecentric lens.
Background technique
In machine vision precision measurement system, there can be some problems using general industry camera lens, as object distance changes meeting
It causes the difference of enlargement ratio, have parallax, distortion big etc., it is difficult to meet high detection requirement, and telecentric lens can reduce even
Eliminate the above problem, it can in certain object distance range, the image enlargement ratio that makes will not with the variation of object distance and
Variation, principal advantage make it be well suited for machine vision metrology detection field.
However be limited to design difficulty and cost control, at present on the market high-resolution telecentric lens be concentrated mainly on it is low
On enlargement ratio, generally at 0.5 times hereinafter, the resolution ratio of the telecentric lens of high magnification is universal lower, have been unable to meet
Some high magnifications and high-resolution application requirement, still, the resolution ratio for improving enlargement ratio telecentric lens can not only increase
Add design difficulty, tolerance sensitivities can also improve, and be unfavorable for producing.
Therefore, urgently a kind of scheme to solve the above problems in industry.
Utility model content
The purpose of this utility model is that: in view of the deficiencies of the prior art, and a kind of telecentric lens provided, the telecentric mirror
Head has the advantages that high magnification, high-resolution, tolerance sensitivities are low, while having superior image quality, the camera lens
It is readily produced, meets the needs in market.
In order to achieve the above object, the utility model uses following technical scheme:
A kind of telecentric lens, including mechanical system and the optical system being installed on inside the mechanical system, the optics
System includes the first lens G1 with positive light coke and biconvex structure set gradually by object end to image planes, has negative power
With the second lens G2 of bent moon structure, the third lens G3 with positive light coke and biconvex structure, there is negative power and concave-concave
The 4th lens G4, prism, the 5th lens G5 with positive light coke and with positive light coke and double-concave structure of structure
Six lens G6, the second lens G2, the third lens G3 and the 4th lens G4 are successively glued to form balsaming lens group U1, the light
The focal length of system is f '.
As a kind of improvement of telecentric lens described in the utility model, the 5th lens G5 is bent moon structure or plano-convex
Structure.
As a kind of improvement of telecentric lens described in the utility model, the focal length of the first lens G1 is f1, with
The focal length f ' of optical system meets relational expression: 1 < | f1/f ' | < 2.
As a kind of improvement of telecentric lens described in the utility model, the focal length of the second lens G2 is f2, with
The focal length of optical system meets relational expression: 1 < | f2/f ' | the refractive index of < 2, the second lens G2 are n2, Abbe number v2, it
Meet relational expression: 1.65 < n2 < 1.75,50 < v2 < 60 respectively.
As a kind of improvement of telecentric lens described in the utility model, the focal length of the third lens G3 is f3, with
The focal length f ' of optical system meets relational expression: 0.4 < | f3/f ' | the refractive index of < 1.4, the third lens G3 are n3, Abbe number
For v3, they meet relational expression: 1.45 < n3 < 1.55,70 < v3 < 85 respectively.
As a kind of improvement of telecentric lens described in the utility model, the focal length of the 4th lens G4 is f4, with
The focal length f ' of optical system meets relational expression: 0.7 < | f4/f ' | the refractive index of < 1.7, the 4th lens G4 are n4, Abbe number
For v4, they meet relational expression: 1.70 < n4 < 1.80,45 < v4 < 55 respectively.
It further include diaphragm as a kind of improvement of telecentric lens described in the utility model, the diaphragm is set to described
Between prism and the 5th lens G5.
As a kind of improvement of telecentric lens described in the utility model, the focal length of the 5th lens G5 is f5, with
The focal length f ' of optical system meets relational expression: 0.5 < | f5/f ' | < 1.5.
As a kind of improvement of telecentric lens described in the utility model, the focal length of the 6th lens G6 is f6, with
The focal length f ' of optical system meets relational expression: 0.5 < | f6/f ' | < 1.5.
The utility model has the beneficial effects that: compared with prior art, the utility model passes through the first lens G1, gluing
The cooperation of lens group U1, prism, the 5th lens G5 and the 6th lens G6 realize still with higher under high magnification
Resolution ratio and lower tolerance sensitivities, greatly meet the needs in market.
Detailed description of the invention
Attached drawing described herein is used to provide a further understanding of the present invention, and constitutes one of the utility model
Point, the exemplary embodiment and its explanation of the utility model are not constituted for explaining the utility model to the utility model
Improper restriction.In the accompanying drawings:
Fig. 1 is the structural schematic diagram of the utility model；
Fig. 2 is the index path of optical system in the utility model；
Fig. 3 is the curvature of field figure of optical system in the utility model；
Fig. 4 is the optical distortion figure of optical system in the utility model；
Fig. 5 is the MTF figure of optical system in the utility model；
Wherein, 0- optical system；1- prism, 2- diaphragm.
Specific embodiment
As used some vocabulary to censure specific components in the specification and claims.Those skilled in the art answer
It is understood that hardware manufacturer may call the same component with different nouns.This specification and claims are not with name
The difference of title is as the mode for distinguishing component, but with the difference of component functionally as the criterion of differentiation.Such as logical
The "comprising" of piece specification and claim mentioned in is an open language, therefore should be construed to " include but do not limit
In "." substantially " refer within an acceptable error range, those skilled in the art can within a certain error range solve described in
Technical problem basically reaches the technical effect.
In the description of the present invention, it should be understood that term " on ", "lower", "front", "rear", "left", "right",
The orientation or positional relationship of the instructions such as level " is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description originally
Utility model and simplified description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific
Orientation construction and operation, therefore should not be understood as limiting the present invention.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " Gu
It is fixed " etc. terms shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood as the case may be
Concrete meaning in the present invention.
The utility model is described in further detail below in conjunction with attached drawing, but not as the restriction to the utility model.
As shown in Fig. 1~5, a kind of telecentric lens, including mechanical system and the optical system being installed on inside mechanical system
0, optical system 0 includes the first lens G1 with positive light coke and biconvex structure set gradually by object end to image planes, has
Second lens G2 of negative power and bent moon structure, the third lens G3 with positive light coke and biconvex structure, there is negative light focus
Degree and the 4th lens G4 of double-concave structure, prism 1, the 5th lens G5 with positive light coke, bent moon structure or plano-convex structure with
And the 6th lens G6 with positive light coke and double-concave structure, the second lens G2, the third lens G3 and the 4th lens G4 successively glue
Conjunction forms balsaming lens group U1, and the focal length of optical system 0 is f '.
Preferably, the focal length of the first lens G1 is f1, meets relational expression with the focal length f ' of optical system 0: 1 < | f1/f ' |
< 2, in the present invention, the first lens G1 is the crown glass of low dispersion.
Preferably, the focal length of the second lens G2 is f2, meets relational expression with the focal length of optical system 0: 1 < | f2/f ' | <
The refractive index of 2, the second lens G2 are n2, Abbe number v2, they meet relational expression: 1.65 < n2 < 1.75,50 < v2 < 60 respectively.
Preferably, the focal length of the third lens G3 is f3, meets relational expression with the focal length f ' of optical system 0: 0.4 < | f3/
F ' | the refractive index of < 1.4, the third lens G3 are n3, Abbe number v3, they meet relational expression: 1.45 < n3 < 1.55 respectively, 70 <
v3<85。
Preferably, the focal length of the 4th lens G4 is f4, meets relational expression with the focal length f ' of optical system 0: 0.7 < | f4/
F ' | the refractive index of < 1.7, the 4th lens G4 are n4, Abbe number v4, they meet relational expression: 1.70 < n4 < 1.80 respectively, 45 <
v4<55。
It preferably, further include diaphragm 2, diaphragm 2 is set between prism 1 and the 5th lens G5, can be imported by prism 1
Coaxial-illuminating light source or other imaging systems.
Preferably, the focal length of the 5th lens G5 is f5, meets relational expression with the focal length f ' of optical system 0: 0.5 < | f5/
F ' | < 1.5, in the present invention, the 5th lens G5 is lanthanum crown glass.
Preferably, the focal length of the 6th lens G6 is f6, meets relational expression with the focal length f ' of optical system 0: 0.5 < | f6/
f’|<1.5。
In the present invention, the first lens G1, the second lens G2, the third lens G3 and the 4th lens G4 are assumed responsibility for
The task of the main aberration correction of optical system 0, balance, the first lens G1 and the third lens G3 and balsaming lens of low dispersion
Being combined with for U1 is conducive to color difference existing for correction high magnification, high-resolution telecentric lens, while the second lens G2, the third lens G3
Be conducive to the aberration that the reduction single plane of refraction of lens undertakes with the 4th lens G4, the tolerance that optical system 0 can be effectively reduced is quick
Sensitivity.
In this example, the data of optical system 0 are as follows:
In addition, the data of each focal length are as follows: f'=41.81mm, f1=62.34mm, f2=-68.75mm, f3=30.25mm,
F4=-43.20mm, f5=40.03mm, f6=-27.12mm；| f1/f'|=1.49, | f2/f'|=1.64, | f3/f'|=
0.72, | f4/f'|=1.03, | f5/f'|=0.96, | f6/f'|=0.65.
In this example, the operating distance of telecentric lens optical system 0 is 114mm, and object-image conjugate is away from for 255mm, half picture
A height of 5.5mm, effective f-number value are 6.5, and enlargement ratio is 1 times.
Attached drawing 3,4,5 respectively the utility model embodiment curvature of field figure, distortion figure, MTF figure, as can be seen from Figure, this
The telecentricity of utility model less than 0.1 °, distortion less than 0.1%, MTF in 145lp/mm be greater than 0.3, have high-resolution and
The low feature of tolerance sensitivities, meets the requirement of high-resolution telecentric lens.
Several preferred embodiments of the utility model have shown and described in above description, but as previously described, it should be understood that
The utility model is not limited to forms disclosed herein, and is not to be taken as the exclusion to other embodiments, and can be used for
Other combinations, modifications, and environments, and above-mentioned introduction or correlation can be passed through within the scope of the inventive concept described herein
The technology or knowledge in field are modified.And changes and modifications made by those skilled in the art do not depart from the spirit of the utility model
And range, then it all should be in the protection scope of the appended claims for the utility model.
Claims (9)
1. a kind of telecentric lens, it is characterised in that: including mechanical system and the optical system being installed on inside the mechanical system
(0), the optical system (0) includes the first lens with positive light coke and biconvex structure set gradually by object end to image planes
G1, the second lens G2 with negative power and bent moon structure, the third lens G3 with positive light coke and biconvex structure, have
4th lens G4 of negative power and double-concave structure, prism (1), the 5th lens G5 with positive light coke and have positive light focus
6th lens G6 of degree and double-concave structure, the second lens G2, the third lens G3 and the 4th lens G4 are successively glued to form glue
Lens group U1 is closed, the focal length of the optical system (0) is f '.
2. telecentric lens according to claim 1, it is characterised in that: the 5th lens G5 is bent moon structure or plano-convex knot
Structure.
3. telecentric lens according to claim 1, it is characterised in that: the focal length of the first lens G1 is f1, with light
The focal length f ' of system (0) meets relational expression: 1 < | f1/f ' | < 2.
4. telecentric lens according to claim 1, it is characterised in that: the focal length of the second lens G2 is f2, with light
The focal length of system (0) meets relational expression: 1 < | f2/f ' | the refractive index of < 2, the second lens G2 are n2, Abbe number v2,
They meet relational expression: 1.65 < n2 < 1.75,50 < v2 < 60 respectively.
5. telecentric lens according to claim 1, it is characterised in that: the focal length of the third lens G3 is f3, with light
The focal length f ' of system (0) meets relational expression: 0.4 < | f3/f ' | the refractive index of < 1.4, the third lens G3 are n3, Abbe number
For v3, they meet relational expression: 1.45 < n3 < 1.55,70 < v3 < 85 respectively.
6. telecentric lens according to claim 1, it is characterised in that: the focal length of the 4th lens G4 is f4, with light
The focal length f ' of system (0) meets relational expression: 0.7 < | f4/f ' | the refractive index of < 1.7, the 4th lens G4 are n4, Abbe number
For v4, they meet relational expression: 1.70 < n4 < 1.80,45 < v4 < 55 respectively.
7. telecentric lens according to claim 1, it is characterised in that: further include diaphragm (2), the diaphragm (2) is set to
Between the prism (1) and the 5th lens G5.
8. telecentric lens according to claim 1, it is characterised in that: the focal length of the 5th lens G5 is f5, with light
The focal length f ' of system (0) meets relational expression: 0.5 < | f5/f ' | < 1.5.
9. telecentric lens according to claim 1, it is characterised in that: the focal length of the 6th lens G6 is f6, with light
The focal length f ' of system (0) meets relational expression: 0.5 < | f6/f ' | < 1.5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920113721.1U CN209311774U (en) | 2019-01-23 | 2019-01-23 | A kind of telecentric lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920113721.1U CN209311774U (en) | 2019-01-23 | 2019-01-23 | A kind of telecentric lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209311774U true CN209311774U (en) | 2019-08-27 |
Family
ID=67681256
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920113721.1U Active CN209311774U (en) | 2019-01-23 | 2019-01-23 | A kind of telecentric lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209311774U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109633874A (en) * | 2019-01-23 | 2019-04-16 | 广东奥普特科技股份有限公司 | A kind of telecentric lens |
-
2019
- 2019-01-23 CN CN201920113721.1U patent/CN209311774U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109633874A (en) * | 2019-01-23 | 2019-04-16 | 广东奥普特科技股份有限公司 | A kind of telecentric lens |
| CN109633874B (en) * | 2019-01-23 | 2024-02-02 | 广东奥普特科技股份有限公司 | Telecentric lens |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN209690601U (en) | A kind of linear array camera lens | |
| CN104094157B (en) | Bugeye lens and camera head | |
| CN107957622B (en) | Large aperture and large image plane tele zoom lens | |
| CN104730684A (en) | Imaging Lens And Imaging Apparatus | |
| CN209690600U (en) | A kind of low high-resolution linear array camera lens of distortion | |
| GB2568358A (en) | Optical system and image pickup apparatus | |
| CN108594401A (en) | A kind of big target surface focusing machine visual linear array camera lens | |
| CN104350409A (en) | Zoom lens and imaging device | |
| CN208314310U (en) | A kind of big target surface focusing machine visual linear array camera lens | |
| CN109633874A (en) | A kind of telecentric lens | |
| CN209311774U (en) | A kind of telecentric lens | |
| CN105388598B (en) | Zoom lens and camera | |
| CN207502802U (en) | 75mm focusing machine visual lens | |
| CN208969324U (en) | A kind of high-resolution machine visual lens | |
| CN106569318B (en) | Optical imaging lens | |
| CN111399198A (en) | Double-telecentric lens | |
| CN208795914U (en) | A kind of wide operating distance focusing machine visual lens of high-resolution | |
| CN208953765U (en) | A kind of big target surface high-res line of high magnification sweeps machine visual lens | |
| JP2015052781A (en) | Zoom lens and image capturing device having the same | |
| CN109100856A (en) | A kind of big adjustable line of target surface multiplying power of high-resolution sweeps machine visual lens | |
| CN109143553A (en) | A kind of high-resolution machine visual lens | |
| CN113341550B (en) | Zoom lens applied to projection | |
| CN108919466A (en) | A kind of wide operating distance focusing machine visual lens of high-resolution | |
| CN208969320U (en) | A kind of big adjustable line of target surface multiplying power of high-resolution sweeps machine visual lens | |
| CN208872933U (en) | A kind of width operating distance high-resolution machine visual lens |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |