CN109884773A - A kind of camera lens of the low big target surface of distortion - Google Patents
A kind of camera lens of the low big target surface of distortion Download PDFInfo
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- CN109884773A CN109884773A CN201910259882.6A CN201910259882A CN109884773A CN 109884773 A CN109884773 A CN 109884773A CN 201910259882 A CN201910259882 A CN 201910259882A CN 109884773 A CN109884773 A CN 109884773A
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Abstract
The invention belongs to lens technology fields, more particularly to a kind of camera lens of low big target surface of distortion, including the lens G1~G9 set gradually by object space to picture, wherein, the third lens G3 and the 4th lens G4, 5th lens G5 and the 6th lens G6, 7th lens G7 and the 8th lens G8 is glued respectively to form the first balsaming lens group U1, second balsaming lens group U2, third balsaming lens group U3, first balsaming lens group U1, second balsaming lens group U2 and third balsaming lens group U3 and the focal length of optical system meet: 0.8 < | fU1/f | < 2, 1.5 < | fU2/f |, | fU3/f | < 4, the present invention can make the shooting of optical system realization focal length 117mm, and maximum imaging surface is up to 82mm, full filed optical distortion is lower than 0.02%, Not only the characteristics of having supported the shooting environmental of big target surface but also being provided simultaneously with low distortion effectively meets the demand in market.
Description
Technical field
The invention belongs to lens technology fields, and in particular to a kind of camera lens of the low big target surface of distortion.
Background technique
The effect of NI Vision Builder for Automated Inspection is to measure target part using machine, judgment and detection defect etc., to subtract
Erroneous judgement when small or elimination manual operation, improves measurement accuracy and stability.Critical component of the camera lens as machine vision, to height
Quality image influences very big.Under the overall background of industrial automation, machine vision demand is growing day by day, especially in electronics system
It makes, measure detection, food packaging etc. in numerous industries for needing high-quality to require, the optical distortion to camera lens, the target surface of support
Size etc. requires higher and higher.
Currently, machine visual lens on the market, such as the patent of Patent No. " 203838393 U of CN ", the patent camera lens
Resolution ratio be only 5,000,000 pixels, pixel is too low, is not able to satisfy the demand in market；For another example Patent No. " CN
The patent of 201721862007.X ", the effective focal length of the patent camera lens are only 8mm, and camera lens imaging is smaller, is not able to satisfy length
The needs of focal length.
Summary of the invention
It is an object of the invention to: in view of the deficiencies of the prior art, and the camera lens of the low big target surface of distortion of one kind provided, it should
Camera lens supports the shooting of maximum imaging surface φ 82mm, and full filed optical distortion is lower than 0.02%, greatly meets market
Demand.
In order to achieve the above object, the invention adopts the following technical scheme:
A kind of camera lens of the low big target surface of distortion, including mechanical system and the optical system being installed on inside the mechanical system
System, the optical system include by object space to the first lens G1 with positive light coke, bent moon structure as setting gradually；Have
Second lens G2 of positive light coke, bent moon structure；The third lens G3 with positive light coke, bent moon structure；With negative power,
4th lens G4 of bent moon structure；The 5th lens G5 with negative power, double-concave structure；With positive light coke, biconvex structure
The 6th lens G6；The 7th lens G7 with negative power, bent moon structure；With positive light coke, bent moon structure the 8th thoroughly
Mirror G8 and the 9th lens G9 with positive light coke, bent moon structure,
Wherein, the third lens G3 and the 4th lens G4 gluing form the first balsaming lens group with negative power
U1, the 5th lens G5 and the 6th lens G6 gluing form the second balsaming lens group U2 with positive light coke, and the described 7th
Lens G7 and the 8th lens G8 gluing form the third balsaming lens group U3 with positive light coke,
The focal length of the optical system is f, and the focal length of the first balsaming lens group U1 is fU1, and described second is glued saturating
The focal length of microscope group U2 is fU2, and the focal length of the third balsaming lens group U3 is fU3, they meet relational expression respectively: 0.8 < |
FU1/f | < 2,1.5 < | fU2/f |, | fU3/f | < 4.
As a kind of improvement of the camera lens to the low big target surface of distortion of the present invention, the front surface of the first lens G1
The distance of vertex to the 7th lens G7 are L, and the focal length f with optical system meets relational expression: | L/f | < 0.65.
As a kind of improvement of the camera lens to the low big target surface of distortion of the present invention, cut after the optics of the optical system
Focal length f away from BFL and optical system, meets relational expression: | BFL/f | > 1.1.
As a kind of improvement of the camera lens to the low big target surface of distortion of the present invention, half image height y ' of the optical system
With the focal length f of optical system, meet relational expression: | y '/f | < 0.5.
As a kind of improvement of the camera lens to the low big target surface of distortion of the present invention, the refractive index of the first lens G1
For n1, refractive index meets relational expression: 1.4 < n1 < 1.6.
As a kind of improvement of the camera lens to the low big target surface of distortion of the present invention, the refractive index of the second lens G2
Meet relational expression: 1.75 < n2 < 2.0 for n2, refractive index n2.
As a kind of improvement of the camera lens to the low big target surface of distortion of the present invention, the focal length of the third lens G3 is
The focal length of fG3, the 4th lens G4 are fG4, and the ratio of focal length fG3 and fG4 meet relational expression: 1 < | fG3/fG4 | < 2.
As a kind of improvement of the camera lens to the low big target surface of distortion of the present invention, the focal length of the 5th lens G5 is
The focal length of fG5, the 6th lens G6 are fG6, and the ratio of focal length fG6 and fG5 meet relational expression: 1 < | fG6/fG5 | < 2.
As a kind of improvement of the camera lens to the low big target surface of distortion of the present invention, the refractive index of the 7th lens G7
Refractive index for n7, the 8th lens G8 is n8, and refractive index n7 and n8 meet relational expression: 1.5 < n7 < 1.70 respectively；
1.70 < n8 < 2.0.
As a kind of improvement of the camera lens to the low big target surface of distortion of the present invention, the focal length of the 9th lens is
FG9, focal length fG9 and f meet relational expression: 0.5 < | fG9/f | < 1.0.
The beneficial effects of the present invention are: compared with prior art, the present invention by the cooperation of said lens G1~G9 with
And the third lens G3 and the 4th lens G4, the 5th lens G5 and the 6th lens, the 7th lens G7 and the 8th lens G8 are distinguished into glue
It closes and forms the first balsaming lens group U1, the second balsaming lens group U2, third balsaming lens group U3, the combination of the lens and lens group
Structure can make the shooting of optical system realization focal length 117mm, and maximum imaging surface, up to 82mm, full filed optical distortion is low
In 0.02%, the characteristics of present invention had not only supported the shooting environmental of big target surface but also had been provided simultaneously with low distortion, market is effectively met
Demand.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes a part of the invention, this hair
Bright exemplary embodiment and its explanation is used to explain the present invention, and is not constituted improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is this practical optical distortion curve graph；
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 is to be understood that, term " on ", "lower", "front", "rear", "left", "right", level "
The orientation or positional relationship of equal instructions is to be based on the orientation or positional relationship shown in the drawings, be merely for convenience of the description present invention and
Simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific orientation construction
And operation, therefore be not considered as limiting the invention.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term 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 be machine
Tool connection, is also possible to be electrically connected；It can be directly connected, two members can also be can be indirectly connected through an intermediary
Connection inside part.For the ordinary skill in the art, above-mentioned term can be understood in this hair as the case may be
Concrete meaning in bright.
Below in conjunction with attached drawing, invention is further described in detail, but not as a limitation of the invention.
As shown in Figure 1, a kind of camera lens of the low big target surface of distortion, including mechanical system and the light being installed on inside mechanical system
System, optical system include by object space to the first lens G1 with positive light coke, bent moon structure as setting gradually；Have
Second lens G2 of positive light coke, bent moon structure；The third lens G3 with positive light coke, bent moon structure；With negative power,
4th lens G4 of bent moon structure；The 5th lens G5 with negative power, double-concave structure；With positive light coke, biconvex structure
The 6th lens G6；The 7th lens G7 with negative power, bent moon structure；With positive light coke, bent moon structure the 8th thoroughly
Mirror G8 and the 9th lens G9 with positive light coke, bent moon structure, in actual operation, lens G1~G9 is spherical mirror；
Wherein, the third lens G3 and the 4th lens G4 gluing form the first balsaming lens group U1 with negative power, the
Five lens G5 and the 6th lens G6 gluing, which are formed, has the second balsaming lens group U2, the 7th lens G7 and the 8th of positive light coke saturating
Mirror G8 gluing forms the third balsaming lens group U3 with positive light coke,
The focal length of optical system is f, and the focal length of the first balsaming lens group U1 is fU1, the focal length of the second balsaming lens group U2
For fU2, the focal length of third balsaming lens group U3 is fU3, they meet relational expression respectively: 0.8 < | fU1/f | < 2,1.5 < | fU2/f
|、|fU3/f|<4。
Preferably, the distance of the front surface vertex of the first lens G1 to the 7th lens G7 are L, the focal length with optical system
F meets relational expression: | L/f | < 0.65.
Preferably, the focal length f of the optics rear cut-off distance BFL of optical system and optical system, meets relational expression: | BFL/f | >
1.1。
Preferably, the focal length f of half image height y ' of optical system and optical system, meets relational expression: | y '/f | < 0.5.
Preferably, the refractive index of the first lens G1 is n1, and refractive index meets relational expression: 1.4 < n1 < 1.6.
Preferably, the refractive index of the second lens G2 is n2, and refractive index n2 meets relational expression: 1.75 < n2 < 2.0.
Preferably, the focal length of the third lens G3 is fG3, and the focal length of the 4th lens G4 is fG4, the ratio of focal length fG3 and fG4
Value meets relational expression: 1 < | fG3/fG4 | < 2.
Preferably, the focal length of the 5th lens G5 is fG5, and the focal length of the 6th lens G6 is fG6, the ratio of focal length fG6 and fG5
Value meets relational expression: 1 < | fG6/fG5 | < 2.
Preferably, the refractive index of the 7th lens G7 is n7, and the refractive index of the 8th lens G8 is n8, and refractive index n7 and n8 divide
Do not meet relational expression: 1.5 < n7 < 1.70；1.70 < n8 < 2.0.
Preferably, the focal length of the 9th lens is fG9, and focal length fG9 and f meet relational expression: 0.5 < | fG9/f | < 1.0.
In this example, the data of optical system are as follows:
| Surface | Radius (mm) | Thickness (mm) | Refractive index |
| G1 front surface | 47.2 | 6.6 | 1.4 |
| G1 rear surface | 126.4 | 0.1 | |
| G2 front surface | 70.2 | 3.6 | 1.9 |
| G2 rear surface | 122.1 | 0.2 | |
| U1 front surface | 31.0 | 7.9 | 1.6 |
| U1 cemented surface | 357.5 | 1.4 | 1.6 |
| U1 rear surface | 23.5 | 17.1 | |
| Diaphragm | Infinity | 8.7 | |
| U2 front surface | -32.0 | 4.7 | 1.8 |
| U2 cemented surface | 148.4 | 10.0 | 1.6 |
| U2 rear surface | -33.7 | 2.9 | |
| U3 front surface | -31.1 | 1.5 | 1.5 |
| U3 cemented surface | -145 | 3.4 | 1.9 |
| U3 rear surface | -65.6 | 0.9 | |
| G9 front surface | -1274.7 | 5.2 | 1.6 |
| G9 rear surface | -61.9 | 139.9 | |
| Image planes | Infinity |
In this example, the focal length f of optical system is 117mm, maximum ring F#=3.8, the first balsaming lens group U1
Focal length fU1=-150mm, the focal length fU2=-223mm of the second balsaming lens group U2, the focal length fU3 of third balsaming lens group U3
The focal length fG3=54.5mm, the focal length fG4=-35.4mm of the 4th lens G4, the 5th lens G5 of=- 204mm, the third lens G3
Focal length fG5=-30.7mm, the focal length fG6=43.9mm of the 6th lens G6, the focal length fG9=93.65mm of the 9th lens G9,
Distance L=75mm of the front surface vertex of first lens G1 to the 7th lens G7, optics rear cut-off distance BFL=139.9mm, half image height
Y '=41mm.
Each relational expression: | fU1/f |=1.28；| fU2/f |=1.90；| fU3/f |=1.74；
| fG3/fG4 |=1.54；| fG6/fG5 |=1.43；| fG9/f |=0.80；| L/f |=0.64；
| BFL/f |=1.19；| y '/f |=0.35
Meet relational expression: 0.8 < | fU1/f | < 2；1.5<|fU2/f|,|fU3/f|<4；
| L/f | < 0.65；|BFL/f|>1.1；| y '/f | < 0.5；
1 < | fG3/fG4 | < 2；1 < | fG6/fG5 | < 2；0.5 < | fG9/f | < 1.0.
Fig. 2 show the optical distortion figure of the present embodiment, and the optical distortion < 0.02% of full filed realizes optical system
Low distortion imaging.
The present invention realizes the optical system for the big target surface camera lens of low distortion that focal length is 117mm by above structure, maximum
Imaging surface is φ 82mm, and full filed optical distortion is lower than 0.02%；For the present invention using whole group focusing mode, clear aperature can also spirit
It is living to adjust, it is able to satisfy different application demands.
Several preferred embodiments of the invention have shown and described in above description, but as previously described, it should be understood that this hair
It is bright to be not limited to forms disclosed herein, it is not to be taken as the exclusion to other embodiments, and can be used for various other
Combination, modification and environment, and can within that scope of the inventive concept describe herein, by the technology of above-mentioned introduction or related fields or
Knowledge is modified.And changes and modifications made by those skilled in the art do not depart from the spirit and scope of the present invention, then it all should be
In the protection scope of appended claims of the present invention.
Claims (10)
1. a kind of camera lens of the low big target surface of distortion, it is characterised in that: including mechanical system and be installed on inside the mechanical system
Optical system, the optical system include by object space to as set gradually with positive light coke, bent moon structure first thoroughly
Mirror G1；The second lens G2 with positive light coke, bent moon structure；The third lens G3 with positive light coke, bent moon structure；Have
4th lens G4 of negative power, bent moon structure；The 5th lens G5 with negative power, double-concave structure；With positive light coke,
6th lens G6 of biconvex structure；The 7th lens G7 with negative power, bent moon structure；With positive light coke, bent moon structure
The 8th lens G8 and the 9th lens G9 with positive light coke, bent moon structure,
Wherein, the third lens G3 and the 4th lens G4 gluing form the first balsaming lens group U1 with negative power, institute
It states the 5th lens G5 and the 6th lens G6 gluing forms the second balsaming lens group U2, the 7th lens G7 with positive light coke
The third balsaming lens group U3 with positive light coke is formed with the 8th lens G8 gluing,
The focal length of the optical system is f, and the focal length of the first balsaming lens group U1 is fU1, the second balsaming lens group
The focal length of U2 is fU2, and the focal length of the third balsaming lens group U3 is fU3, they meet relational expression respectively: 0.8 < | fU1/f | <
2,1.5 < | fU2/f |, | fU3/f | < 4.
2. the camera lens of the low big target surface of distortion according to claim 1, it is characterised in that: the front surface of the first lens G1
The distance of vertex to the 7th lens G7 are L, and the focal length f with optical system meets relational expression: | L/f | < 0.65.
3. the camera lens of the low big target surface of distortion according to claim 1, it is characterised in that: cut after the optics of the optical system
Focal length f away from BFL and optical system, meets relational expression: | BFL/f | > 1.1.
4. the camera lens of the low big target surface of distortion according to claim 1, it is characterised in that: half image height y ' of the optical system
With the focal length f of optical system, meet relational expression: | y '/f | < 0.5.
5. the camera lens of the low big target surface of distortion according to claim 1, it is characterised in that: the refractive index of the first lens G1
For n1, refractive index meets relational expression: 1.4 < n1 < 1.6.
6. the camera lens of the low big target surface of distortion according to claim 1, it is characterised in that: the refractive index of the second lens G2
Meet relational expression: 1.75 < n2 < 2.0 for n2, refractive index n2.
7. the camera lens of the big target surface of low distortion according to claim 1, it is characterised in that: the focal length of the third lens G3 is
The focal length of fG3, the 4th lens G4 are fG4, and the ratio of focal length fG3 and fG4 meet relational expression: 1 < | fG3/fG4 | < 2.
8. the camera lens of the big target surface of low distortion according to claim 1, it is characterised in that: the focal length of the 5th lens G5 is
The focal length of fG5, the 6th lens G6 are fG6, and the ratio of focal length fG6 and fG5 meet relational expression: 1 < | fG6/fG5 | < 2.
9. the camera lens of the low big target surface of distortion according to claim 1, it is characterised in that: the refractive index of the 7th lens G7
Refractive index for n7, the 8th lens G8 is n8, and refractive index n7 and n8 meet relational expression: 1.5 < n7 < 1.70 respectively；
1.70 < n8 < 2.0.
10. the camera lens of the big target surface of low distortion according to claim 1, it is characterised in that: the focal length of the 9th lens is
FG9, focal length fG9 and f meet relational expression: 0.5 < | fG9/f | < 1.0.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910259882.6A CN109884773B (en) | 2019-04-02 | 2019-04-02 | Lens with low distortion and large target surface |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910259882.6A CN109884773B (en) | 2019-04-02 | 2019-04-02 | Lens with low distortion and large target surface |
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| CN109884773A true CN109884773A (en) | 2019-06-14 |
| CN109884773B CN109884773B (en) | 2023-12-05 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111142242A (en) * | 2020-03-06 | 2020-05-12 | 广东奥普特科技股份有限公司 | A low-distortion industrial lens with high resolution and wide working distance |
| CN111190272A (en) * | 2020-03-06 | 2020-05-22 | 广东奥普特科技股份有限公司 | High-resolution large-aperture lens |
| CN111190269A (en) * | 2020-03-06 | 2020-05-22 | 广东奥普特科技股份有限公司 | High-resolution industrial lens |
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| CN102967924A (en) * | 2012-11-08 | 2013-03-13 | 中山联合光电科技有限公司 | Optical lens |
| CN103913817A (en) * | 2014-03-27 | 2014-07-09 | 徐中一 | Ultra-large-aperture full-width lens for digital single-lens reflex camera |
| CN105445908A (en) * | 2015-12-24 | 2016-03-30 | 中山联合光电科技股份有限公司 | High-image quality, large-image frame and small-distortion optical imaging system |
| CN209590392U (en) * | 2019-04-02 | 2019-11-05 | 奥普特视觉科技(苏州)有限公司 | A kind of camera lens of the low big target surface of distortion |
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2019
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0789259A2 (en) * | 1996-02-08 | 1997-08-13 | Minolta Co., Ltd. | Optical system with vibration reduction function |
| CN102967924A (en) * | 2012-11-08 | 2013-03-13 | 中山联合光电科技有限公司 | Optical lens |
| CN103913817A (en) * | 2014-03-27 | 2014-07-09 | 徐中一 | Ultra-large-aperture full-width lens for digital single-lens reflex camera |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111142242A (en) * | 2020-03-06 | 2020-05-12 | 广东奥普特科技股份有限公司 | A low-distortion industrial lens with high resolution and wide working distance |
| CN111190272A (en) * | 2020-03-06 | 2020-05-22 | 广东奥普特科技股份有限公司 | High-resolution large-aperture lens |
| CN111190269A (en) * | 2020-03-06 | 2020-05-22 | 广东奥普特科技股份有限公司 | High-resolution industrial lens |
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