CN109975962A - A kind of bilateral telecentric optical system with long reach - Google Patents
A kind of bilateral telecentric optical system with long reach Download PDFInfo
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- CN109975962A CN109975962A CN201910303355.0A CN201910303355A CN109975962A CN 109975962 A CN109975962 A CN 109975962A CN 201910303355 A CN201910303355 A CN 201910303355A CN 109975962 A CN109975962 A CN 109975962A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 83
- 230000002146 bilateral effect Effects 0.000 title claims abstract description 25
- 239000000463 material Substances 0.000 claims description 15
- 239000005308 flint glass Substances 0.000 claims description 7
- 229910052788 barium Inorganic materials 0.000 claims description 3
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052746 lanthanum Inorganic materials 0.000 claims description 3
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 17
- 238000001514 detection method Methods 0.000 abstract description 12
- 238000003384 imaging method Methods 0.000 abstract description 12
- 230000010354 integration Effects 0.000 abstract description 3
- 238000005457 optimization Methods 0.000 description 10
- 230000004075 alteration Effects 0.000 description 6
- 238000005286 illumination Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
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- 241000226585 Antennaria plantaginifolia Species 0.000 description 1
- XCWPUUGSGHNIDZ-UHFFFAOYSA-N Oxypertine Chemical compound C1=2C=C(OC)C(OC)=CC=2NC(C)=C1CCN(CC1)CCN1C1=CC=CC=C1 XCWPUUGSGHNIDZ-UHFFFAOYSA-N 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/22—Telecentric objectives or lens systems
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Abstract
The bilateral telecentric optical system with long reach that the invention discloses a kind of, including the front lens group, diaphragm and rear lens group set gradually from front to back along light incident direction；The front lens group includes the first lens, and the rear lens group includes the second lens set gradually from front to back, the third lens, the 4th lens, the 5th lens and the 6th lens；The image planes of the optical system are located at the rear end of the 6th lens；First lens, the second lens and the 5th lens are the biconvex lens that focal power is positive, and the third lens and the 6th lens are the biconcave lens that focal power is negative, and the 4th lens are the plano-convex lens that focal power is positive；Second lens and the third lens form cemented doublet.The present invention realizes the detection imaging of image bilateral telecentricity Yu extremely low distortion using less optical lens quantity, obtains the Optical System Design of nearly diffraction limit image quality, while the Planar integration where diaphragm may be implemented and arrange lighting source component.
Description
Technical field
The present invention relates to technical field of optical, more specifically to a kind of bilateral telecentricity with long reach
Optical system.
Background technique
Industrial detection technology based on telecentric optical system is applied to the fields such as high-end automation, machine vision, pushes vapour
The industries such as vehicle industry, semiconductor integrated circuit manufacture, advanced material processing, the high-accuracy assembling of aerospace and household electrical appliances manufacture
Technology iteration and industrial upgrading present superiority on realizing properties of product, efficiency, precision and cost control.Image is double
Side telecentric optical system can not only eliminate the collimation error of object space testee, but also can eliminate image space detector and be in not
With magnification error caused by image planes position, constant detection multiplying power is obtained, realizes that the features such as undistorted shape and size detect,
It is had been widely used in field of industry detection.
There are many image bilateral telecentric optical systems to be applied to PCB circuit board, mobile phone products, ceramic element, height at present
In the detection of all types of industries such as precision collet, light transmission class product and Precision Machinery Elements.Image bilateral telecentricity light on current market
The problems such as that there are lens numbers is more for system, higher cost, it is larger etc. there are marginal distortion and telecentricity in terms of image quality
Deficiency, and the volume after integrated lighting light source assembly and size are more huge.
Summary of the invention
The present invention provides a kind of bilateral telecentric optical system with long reach, by less lens numbers, realizes
High-resolution and extremely low distortion are imaged.
The solution that the present invention solves its technical problem is: a kind of bilateral telecentric optics system with long reach
System, including the front lens group, diaphragm and rear lens group set gradually from front to back along light incident direction；
The front lens group include the first lens, the rear lens group include the second lens set gradually from front to back,
The third lens, the 4th lens, the 5th lens and the 6th lens；After the image planes of the optical system are located at the 6th lens
End；
First lens, the second lens and the 5th lens are the biconvex lens that focal power is positive, the third lens
It is the biconcave lens that focal power is negative with the 6th lens, the 4th lens are the plano-convex lens that focal power is positive；
Second lens and the third lens form cemented doublet.
Further, the focal power of the front lens group is positive, and the focal power of the rear lens group is positive；The front lens group
Focal power beThe focal power of the rear lens group isIt is describedRatio meet:
Further, the high ratio of the image height Yu object of the optical system is enlargement ratio X, and the enlargement ratio X meets:
0.12≤|X|≤0.36。
Further, the chief ray of different object point light beams and the angle of optical axis of the optical system are θ1, reach image planes light
The chief ray of beam and the angle of optical axis are θ2, the θ1And θ2Meet:
0°≤|θ1|≤0.15°；
0°≤|θ2|≤0.25°。
Further, second power of lens isThe focal power of the third lens isIt is described
WithRatio meet:
Further, the combination focal power of the 4th lens and the 5th lens is6th power of lens
ForIt is describedWithRatio meet:
Further, total focal power of the optical system isFirst power of lens isDescribed second
The focal power of cemented doublet of lens and the third lens composition is4th power of lens isIt is described
5th power of lens is6th power of lens isThen meet:
Further, the third lens are thick lens.
Further, the material of first lens, the third lens and the 4th lens is dense flint glass, and described second thoroughly
The material of mirror is dense crown, and the material of the 5th lens is attached most importance to lanthanum flint glass, and the material of the 6th lens is attached most importance to barium
Flint glass.
Further, CCD camera or CMOS camera are set at the image planes, and the CCD camera or CMOS camera are for receiving
Object plane signal.
The beneficial effects of the present invention are: the present invention using less optical lens quantity solve realize long reach with
Technical problem between high-resolution detection imaging, and the detection imaging of image bilateral telecentricity Yu extremely low distortion is realized, it obtains
The Optical System Design of nearly diffraction limit image quality, while the Planar integration where diaphragm may be implemented and arrange lighting source component.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described.Obviously, described attached drawing is a part of the embodiments of the present invention, rather than is all implemented
Example, those skilled in the art without creative efforts, can also be obtained according to these attached drawings other designs
Scheme and attached drawing.
Fig. 1 is the composed structure schematic diagram of optical system of the present invention；
Fig. 2 is the schematic diagram that optical system of the present invention realizes lighting source component Integrated design；
Fig. 3 is optical system optical transfer function curve graph of the present invention；
Fig. 4 is the distortion figure of optical system of the present invention；
Fig. 5 is the relative illumination scatter chart of optical system of the present invention.
Specific embodiment
It is carried out below with reference to technical effect of the embodiment and attached drawing to design of the invention, specific structure and generation clear
Chu, complete description, to be completely understood by the purpose of the present invention, feature and effect.Obviously, described embodiment is this hair
Bright a part of the embodiment, rather than whole embodiments, based on the embodiment of the present invention, those skilled in the art are not being paid
Other embodiments obtained, belong to the scope of protection of the invention under the premise of creative work.In addition, be previously mentioned in text
All connection relationships not singly refer to that component directly connects, and referring to can be according to specific implementation situation, by adding or reducing connection
Auxiliary, Lai Zucheng more preferably connection structure.Each technical characteristic in the invention, under the premise of not conflicting conflict
It can be with combination of interactions.
Embodiment 1, referring to Fig.1, a kind of bilateral telecentric optical system with long reach, including along light incidence side
To the front lens group, diaphragm 700 and rear lens group set gradually from front to back；
The front lens group include the first lens 100, the rear lens group include set gradually from front to back second thoroughly
Mirror 200, the third lens 300, the 4th lens 400, the 5th lens 500 and the 6th lens 600；The image planes 800 of the optical system
Positioned at the rear end of the 6th lens 600；
First lens 100, the second lens 200 and the 5th lens 500 are the biconvex lens that focal power is positive, described
The third lens 300 and the 6th lens 600 are the biconcave lens that focal power is negative, and the 4th lens 400 are what focal power was positive
Plano-convex lens；
Second lens 200 and the third lens 300 form cemented doublet.
As optimization, the third lens 300 are thick lens.
The diaphragm 700 is aperture diaphragm.
The object plane of the optical system is located at the front end of first lens 100.
As optimization, the focal power of the front lens group is positive, and the focal power of the rear lens group is positive；
The focal power of the front lens group isThe focal power of the rear lens group isIt is describedRatio
Meet:
As optimization, the image height and the high ratio of object of the optical system are enlargement ratio X, and the enlargement ratio X meets:
0.12≤|X|≤0.36。
Object plane is imaged in image planes 800 after optical system imaging in a manner of diminution.
As optimization, the chief ray of different object point light beams and the angle of optical axis of the optical system are θ1, reach image planes
The chief ray of 800 light beams and the angle of optical axis are θ2, the θ1And θ2Meet:
0°≤|θ1|≤0.15°；
0°≤|θ2|≤0.25°。
As optimization, the focal power of second lens 200 isThe focal power of the third lens 300 is
It is describedWithRatio meet:
Second lens 200 are the first optical surface close to the optical surface of diaphragm 700, and first optical surface is bending
State and the backwards diaphragm 700, generate pincushion distortion aberration compensation optical aberration；The third lens 300 are thick lens, drop
The height of low emergent ray, and generate certain curvature of field aberration and play the role of system flat field.
As optimization, the combination focal power of the 4th lens 400 and the 5th lens 500 is6th lens
600 focal power isIt is describedWithRatio meet:
4th lens 400 of the plano-convex positive light coke in rear lens group, the 5th lens 500 of biconvex positive light coke and double
6th lens 600 of recessed negative power mainly realize the design of telecentric beam path in image space, the 6th lens 600 close to image planes 800,
The residual distortion of compensation optical system and curvature of field aberration.
As optimization, total focal power of the optical system isThe focal power of first lens 100 isInstitute
The focal power for stating the cemented doublet that the second lens 200 and the third lens 300 form isThe light of 4th lens 400
Focal power isThe focal power of 5th lens 500 isThe focal power of 6th lens 600 isIt is then full
Foot:
As optimization, the material of first lens 100, the third lens 300 and the 4th lens 400 is dense flint glass
Glass, the materials of second lens 200 are dense crown, and the material of the 5th lens 500 is attached most importance to lanthanum flint glass, described the
The material of six lens 600 is dense barium flint.
This optical system uses only a piece of bigbore optical lens, remaining lens is small-bore size, and all
Lens material is inexpensive conventional glass material, is conducive to the manufacturing cost that optical lens is greatly reduced, it is easy to accomplish batch
Industrialized manufacture and popularization.
As optimization, CCD camera is set at the image planes 800 or CMOS camera, the CCD camera or CMOS camera are used for
Object plane signal is received, to obtain clear high-resolution object plane information.
The present invention is using symmetrical optical system structure pattern is lost, due to being reduced to the lens of front lens group only
A piece of, aberration correction pressure concentrates on rear lens group, has carried out complicating design and configuration optimization to this.Rear lens group is adopted first
The color difference of system is corrected with cemented doublet, and compensates certain distortion, by suitably increasing the thickness of negative lens in double gluings,
Playing reduces beam projecting height, mitigates aberration correction pressure.Finally using the lens combination of " just, just, bearing " focal power distribution
Light beam is imaged onto image planes 800 by pattern, realization in a manner of telecentricity, and realizes that flat field designs.It is finally obtained nearly diffraction pole
The image quality of limit.
In the present embodiment, object space telecentricity is no more than 0.15 °, and image space telecentricity is no more than 0.25 °, the design of object space telecentricity
It can effectively solve the problems, such as that fluoroscopy images are distorted, fixed multiplying power may be implemented and not by image planes 800 in conjunction with the design of image space telecentricity
The influence of position.The camera lens object space telecentricity design result, illustrate to be imaged object plane chief ray will in parallel and optical axis, no matter object plane
Positioned at where, optical system all will not influence to the imaging multiplying power of object height.That is, the multiplying power of image space and object space
It is constant, low distortion is provided for camera lens and eliminates the picture acquisition power of the collimation error.Full filed distortion is no more than 0.02%,
Measurement error caused by distortion is eliminated, the measurement accuracy of optical system is improved.
In the present embodiment, it is solved first using less optical lens quantity and realizes long reach and high-resolution
Technical problem between detection imaging, and the detection imaging of image bilateral telecentricity Yu extremely low distortion is realized, obtain nearly diffraction pole
Limit the Optical System Design of image quality.
Optical system of the present invention reaches nearly diffraction limit image quality only with 6 lens, has small in size, weight
Gently, the low advantage of manufacturing cost is conducive to be promoted on the market.
Optical system structure of the present invention is compact, realizes image bilateral telecentricity only with 6 conventional spherical lenses elements and sets
Meter, and the image quality and extremely low distortion design of nearly diffraction limit are obtained, meet high-end industrial detection machine vision and high-resolution is examined
Survey the demand of imaging.
Parameter designing requirement of the present embodiment according to above-mentioned optical system, designs and a meets above-mentioned optical system parameter
It is required that a kind of bilateral telecentric optical system with long reach, the technical indicator which reaches are as follows:
Image-side numerical aperture: 0.075；
Object space imaging size: 35mm；
Object space operating distance: 200mm；
Enlargement ratio: 0.2；
Optics relative distortion :≤0.02%；
Spectral coverage: 486nm~656nm is imaged；
Object space telecentricity :≤0.15 °；
Pixel telecentricity :≤0.25 °；
Optics overall length :≤245mm；
Relative illumination: >=99.2%.
In the present embodiment, front lens group is in addition to a piece of and comparable biconvex positive light coke of object plane size the first lens
100, there is no optical lens in other positions, without increasing mounting structure；Therefore, lighting source component can be arranged in diaphragm
700 place planes, the light that lighting source issues will not be blocked by optical lens or structural member, in conjunction with the property of parallel light emergence
Matter will realize the Uniform Illumination to object plane.
Optical system of the invention has the feature that can integrate lighting source component, helps to reduce lighting source coupling
The optical path component for closing object plane reduces the development cost of product.
The present embodiment is characterized in 700 place Planar realization of diaphragm by lighting source component Integrated design with reference to Fig. 2, Fig. 2
Signal.Wherein the Obj in Fig. 2 is object plane, and LED is lighting source, and LEDAssem is the component for installing lighting source,
LensStruc is the lens barrel structure part for installing front lens group and lighting source component, and L is that lighting source is thrown after front lens group
It is mapped to the light of object plane.700 place plane of diaphragm is the position of focal plane of front lens group, places what lighting source issued in the plane
Light will be with directional light uniform after front lens group.
Front lens group only has a piece of bore and the comparable Large Aperture Lenses of object plane, and other different mouths are not provided with before diaphragm 700
The lens of diameter；Since 700 place plane of diaphragm is located at the position of focal plane of front lens group, 700 position of diaphragm clear aperture it
Outer setting lighting source component, lighting source issue light can not be blocked by front lens group and with parallel light emergence
Mode is incident upon on object plane, and lighting source component is integrated in inside optical system by realization, without other optical elements
Coupled illumination light projection realizes highly integrated and miniaturization design on object plane.
The optical transfer function curve distribution of entire optical system in the present embodiment, optical system are characterized with reference to Fig. 3, Fig. 3
The optical transfer function value for all visual fields of uniting reaches 0.34 in 130lp/mm, realizes that nearly diffraction limit image quality, image quality are good
It is good.
The distortion distribution curve of the present embodiment optical system is characterized with reference to Fig. 4, Fig. 4, distortion is no more than 0.02%, approaches
In zero, the caused measurement error that distorts is effectively prevented.
The illuminance of image plane distribution that the present embodiment optical system is characterized with reference to Fig. 5, Fig. 5, in areas imaging, illuminance of image plane
The uniformity reaches 99.2% or more, ensure that image illumination uniformity.
The present invention solved using less optical lens quantity realize long reach and high-resolution detection imaging it
Between technical problem, and realize the detection imaging of image bilateral telecentricity Yu extremely low distortion, obtain the light of nearly diffraction limit image quality
System design, while the Planar integration where diaphragm may be implemented and arrange lighting source component.
Better embodiment of the invention is illustrated above, but the invention is not limited to the implementation
Example, those skilled in the art can also make various equivalent modifications on the premise of without prejudice to spirit of the invention or replace
It changes, these equivalent variation or replacement are all included in the scope defined by the claims of the present application.
Claims (10)
1. a kind of bilateral telecentric optical system with long reach, it is characterised in that: including along light incident direction from before
Front lens group, diaphragm and the rear lens group set gradually backward；
The front lens group includes the first lens, and the rear lens group includes the second lens set gradually from front to back, third
Lens, the 4th lens, the 5th lens and the 6th lens；The image planes of the optical system are located at the rear end of the 6th lens；
First lens, the second lens and the 5th lens are the biconvex lens that focal power is positive, the third lens and
Six lens are the biconcave lens that focal power is negative, and the 4th lens are the plano-convex lens that focal power is positive；
Second lens and the third lens form cemented doublet.
2. a kind of bilateral telecentric optical system with long reach according to claim 1, it is characterised in that:
The focal power of the front lens group is positive, and the focal power of the rear lens group is positive；
The focal power of the front lens group isThe focal power of the rear lens group isIt is describedRatio it is full
Foot:
3. a kind of bilateral telecentric optical system with long reach according to claim 1, it is characterised in that: described
The image height and the high ratio of object of optical system are enlargement ratio X, and the enlargement ratio X meets:
0.12≤|X|≤0.36。
4. a kind of bilateral telecentric optical system with long reach according to claim 1, it is characterised in that: described
The chief ray of different object point light beams and the angle of optical axis of optical system are θ1, reach the chief ray of image planes light beam and the folder of optical axis
Angle is θ2, the θ1And θ2Meet:
0°≤|θ1|≤0.15°；
0°≤|θ2|≤0.25°。
5. a kind of bilateral telecentric optical system with long reach according to claim 1, it is characterised in that: described
Second power of lens isThe focal power of the third lens isIt is describedWithRatio meet:
6. a kind of bilateral telecentric optical system with long reach according to claim 1, it is characterised in that: described
The combination focal power of 4th lens and the 5th lens is6th power of lens isIt is describedWithRatio meet:
7. a kind of bilateral telecentric optical system with long reach according to claim 1, it is characterised in that: described
Total focal power of optical system isFirst power of lens isWhat second lens and the third lens formed
The focal power of cemented doublet is4th power of lens is5th power of lens is6th power of lens isThen meet:
8. a kind of bilateral telecentric optical system with long reach according to claim 1, it is characterised in that: described
The third lens are thick lens.
9. a kind of bilateral telecentric optical system with long reach according to claim 1, it is characterised in that: described
The material of first lens, the third lens and the 4th lens is dense flint glass, and the material of second lens is dense crown,
The material of 5th lens is attached most importance to lanthanum flint glass, and the material of the 6th lens is dense barium flint.
10. a kind of bilateral telecentric optical system with long reach according to claim 1, it is characterised in that: institute
It states and CCD camera or CMOS camera is set at image planes, the CCD camera or CMOS camera are for receiving object plane signal.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110456478A (en) * | 2019-08-02 | 2019-11-15 | 佛山科学技术学院 | 3mm focal length ultra-wide angle FISH EYE LENS OPTICS system |
| CN110471166A (en) * | 2019-08-02 | 2019-11-19 | 佛山科学技术学院 | A kind of low distortion compact high-resolution FISH EYE LENS OPTICS system |
| CN113534101A (en) * | 2021-08-02 | 2021-10-22 | 锐驰智光(北京)科技有限公司 | Optical system and laser radar |
| CN114578516A (en) * | 2022-03-11 | 2022-06-03 | 深圳市视清科技有限公司 | Optical lens with stable imaging quality |
| CN115128782A (en) * | 2022-07-06 | 2022-09-30 | 闽都创新实验室 | High-magnification long-working-distance coaxial illumination telecentric optical system and lens |
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