CN208937794U - A kind of miniaturization image bilateral telecentric optical system - Google Patents
A kind of miniaturization image bilateral telecentric optical system Download PDFInfo
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- CN208937794U CN208937794U CN201821648895.XU CN201821648895U CN208937794U CN 208937794 U CN208937794 U CN 208937794U CN 201821648895 U CN201821648895 U CN 201821648895U CN 208937794 U CN208937794 U CN 208937794U
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Abstract
The utility model describes a kind of miniaturization image bilateral telecentric optical system, including including the first lens, the second lens, the third lens, the 4th lens, the 5th lens, aperture diaphragm, the 6th lens, the 7th lens being arranged successively along object plane on as plane propagation direction in light.First lens use bent moon positive power lens using bent moon positive power lens, the 7th lens using bent moon negative-power lenses, the 6th lens using bent moon positive power lens, the 5th lens using bent moon negative-power lenses, the 4th lens using biconvex positive power lens, the third lens using biconvex positive power lens, the second lens.The utility model has carried out design innovation, has fabulous telecentricity, extremely low distortion and the image quality close to diffraction limit, can obtain the micron order measurement accuracy for eliminating object space parallax and constant multiplying power, improve detection accuracy.
Description
Technical field
The utility model relates to optical field more particularly to a kind of miniaturization image bilateral telecentric optical systems.
Background technique
Bilateral telecentric optical system can not only eliminate the collimation error of object space testee, but also can eliminate image space sky
Between detector be in magnification error caused by different image planes positions, obtain constant detection multiplying power, field of industry detection obtain
It is widely applied.But many bilateral telecentric lens detection imaging effects are not ideal enough, for example marginal distortion is big, and image quality is not
Enough good etc., especially bilateral telecentric lens longer dimension is not easy to realize small light.
Utility model content
For deficiency existing for existing object space telecentric optical system, it is double that the utility model provides a kind of miniaturization image
Side telecentric optical system.
To achieve the above objectives, the utility model adopts the following technical solution:
A kind of miniaturization image bilateral telecentric optical system, including light along object plane to as along plane propagation direction according to
First lens of secondary arrangement, the second lens, the third lens, the 4th lens, the 5th lens, aperture diaphragm, the 6th lens, the 7th are thoroughly
Mirror；
First lens, the second lens, the third lens, the 4th lens, the 5th lens constitute preceding group of positive light coke, institute
It states the 6th lens and the 7th lens constitutes rear group of positive light coke；
If total focal power of the optical system is φ, first lens to the 7th power of lens are followed successively by
φ 1 to φ 7, then 1/ φ=0.035 of φ, 3/ φ of φ 2/ φ=0.036, φ=5/ φ of -0.038, φ 4/ φ=0.041, φ=-
7/ φ=0.076 0.013, φ 6/ φ=0.065, φ.
Further, second lens and the third lens form double agglutination lens group.
Further, first lens use biconvex positive light coke using biconvex positive power lens, second lens
Lens, the third lens are using bent moon negative-power lenses, the 4th lens using bent moon positive power lens, described the
Five lens are used using bent moon negative-power lenses, the 6th lens using bent moon positive power lens, the 7th lens
Bent moon positive power lens.
Further, the first lens front surface radius of curvature be 279.353mm, rear surface radius of curvature be-
92.145mm, center thickness 10.0mm, lens clear aperture are φ 43.1mm；The second lens front surface radius of curvature is
80.439mm, rear surface radius of curvature are -83.128mm, and center thickness 6.62mm, lens clear aperture is φ 40.6mm；Institute
Stating the third lens front surface radius of curvature is -83.128mm, and rear surface radius of curvature is -1621.443mm, and center thickness is
1.5mm, lens clear aperture are φ 40.1mm；The 4th lens front surface radius of curvature is 40.460mm, rear surface curvature
Radius is 115.796mm, and material center thickness is 9.99mm, and lens clear aperture is φ 37.0mm；5th lens front surface
Radius of curvature is 90.034mm, and rear surface radius of curvature is 17.589mm, and center thickness 10.0mm, lens clear aperture is φ
13.3mm；The 6th lens front surface radius of curvature is -67.526mm, and rear surface radius of curvature is -47.459mm, and center is thick
Degree is 9.57mm, and lens clear aperture is φ 42.1mm；The 7th lens front surface radius of curvature is -215.047mm, rear table
Curvature radius is -89.201mm, and center thickness 8.22mm, lens clear aperture is φ 52.2mm.
Further, first lens are made of dense flint glass material, second lens are using fluor crown material
Material is made, the third lens are made of dense flint glass material, the 4th lens are made of dense crown material, institute
State the 5th lens are made of dense flint glass material, the 6th lens are made of dense flint glass material, the described 7th
Lens are made of dense flint glass material.
The utility model has the beneficial effect that:
The utility model is compact-sized, in identical imaging viewing field, imaging multiplying power, numerical aperture and object space operating distance
The overall length of existing optical system generally requires 260mm or more under index, and this system only 195mm is advantageously implemented optical system
Small light and low cost；
The lens numbers of the utility model optical system are few, and structure is simple, and focal power distribution is reasonable, the processing of lens and dress
Lower with tolerance, manufacturability degree is high, is conducive to save manufacturing cost；
The telecentricity of the image bilateral of the utility model is no more than 0.022 °, and full filed distortion is no more than 0.005%, has
Fabulous telecentricity, extremely low distortion and the image quality close to diffraction limit can obtain and eliminate object space parallax and constant times
The micron order measurement accuracy of rate, improves detection accuracy.
Detailed description of the invention
Fig. 1 is the composed structure schematic diagram of the utility model optical system；
Fig. 2 is the utility model optical system optical transfer function curve graph at 30lp/mm；
Fig. 3 is the utility model optical system optical transfer function curve graph at 60lp/mm；
Fig. 4 is the distortion figure of the utility model optical system；
Fig. 5 is the illumination figure of the utility model optical system.
Specific embodiment
The essence that the utility model is more fully understood for convenience of those of ordinary skill in the art, with reference to the accompanying drawing to this reality
It is described in detail with novel specific embodiment.
In conjunction with Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5, a kind of miniaturization image bilateral telecentric optical system is included in light
The first lens 3, the second lens 4, the third lens 5, the 4th lens being arranged successively along object plane 1 on as 2 direction of propagation of plane
6, the 5th lens 7, aperture diaphragm 8, the 6th lens 9, the 7th lens 10；
Before first lens 3, the second lens 4, the third lens 5, the 4th lens 6, the 5th lens 7 constitute positive light coke
Group, the 6th lens 9 and the 7th lens 10 constitute rear group of positive light coke.
Second lens 4 and the third lens 5 form double agglutination lens group.
First lens 3 use biconvex positive power lens, third using biconvex positive power lens, the second lens 4
Lens 5 use the negative light of bent moon using bent moon positive power lens, the 5th lens 7 using bent moon negative-power lenses, the 4th lens 6
Power lenses, the 6th lens 9 use bent moon positive power lens using bent moon positive power lens, the 7th lens 10.
In the present embodiment, each lens sizes are as follows: the first lens front surface radius of curvature is 279.353mm, after
Surface curvature radius is -92.145mm, and center thickness 10.0mm, lens clear aperture is φ 43.1mm；Second lens
Front surface radius of curvature is 80.439mm, and rear surface radius of curvature is -83.128mm, center thickness 6.62mm, lens light passing
Bore is φ 40.6mm；The third lens front surface radius of curvature be -83.128mm, rear surface radius of curvature be -
1621.443mm, center thickness 1.5mm, lens clear aperture are φ 40.1mm；The 4th lens front surface radius of curvature
For 40.460mm, rear surface radius of curvature is 115.796mm, and material center thickness is 9.99mm, and lens clear aperture is φ
37.0mm；The 5th lens front surface radius of curvature is 90.034mm, and rear surface radius of curvature is 17.589mm, center thickness
For 10.0mm, lens clear aperture is φ 13.3mm；The 6th lens front surface radius of curvature is -67.526mm, rear surface
Radius of curvature is -47.459mm, and center thickness 9.57mm, lens clear aperture is φ 42.1mm；Table before 7th lens
Curvature radius is -215.047mm, and rear surface radius of curvature is -89.201mm, center thickness 8.22mm, lens light admission port
Diameter is φ 52.2mm.
In the present embodiment, each lens making material is as follows: the first lens 3 are made using dense flint glass material, are described
Second lens 4 are made of fluor crown material, the third lens 5 are made of dense flint glass material, the described 4th thoroughly
Mirror 6 is made of dense crown material, the 5th lens 7 are made of dense flint glass material, the 6th lens 9 use
Dense flint glass material is made, the 7th lens 10 are made of dense flint glass material.
If total focal power of optical system is φ, the first lens to the 6th power of lens are followed successively by φ 1 to φ 7, then
3/ φ of φ 1/ φ=0.035, φ 2/ φ=0.036, φ=- 0.038, φ 4/ φ=0.041, φ 5/ φ=- 0.013, φ 6/
7/ φ=0.076 φ=0.065, φ.
In the present embodiment, each lens placement position relationship are as follows: the first lens 3 are 0.92mm at a distance from the second lens 4；The
Three lens 5 are 0.2mm at a distance from the 4th lens 6；4th lens 6 are 21.77mm at a distance from the 5th lens 7；5th lens
With 7 with aperture diaphragm 8 at a distance from be 1.41mm；Aperture diaphragm 8 is 57.6mm, the 6th lens 9 and the at a distance from the 6th lens 9
The distance of seven lens 10 is 33.4mm, and the 7th lens 10 are 23.79mm at a distance from as plane.
Optical system described in the utility model belongs to image bilateral telecentric beam path, and the angle of object space chief ray and optical axis does not surpass
Cross 0.022 °, the angle of image space chief ray and optical axis is no more than 0.014 °.
And as shown in Figure 2, the optical transfer function value of all visual fields of this optical system is more than in 30lp/mm
0.65。
From the figure 3, it may be seen that the optical transfer function value of all visual fields of this optical system has been more than 0.43 in 60lp/mm.It connects
Close diffraction limit, image quality are good.
As seen from Figure 4, for the utility model within the scope of image space 50mm, distortion is no more than 0.005%, close to
Zero, effectively prevent the caused measurement error that distorts.
As seen from Figure 5, the utility model is within the scope of image space 55mm, and relative illumination is better than 99.2%, full view
Field luminance is evenly distributed, and avoids the decline of measurement accuracy caused by differences of illumination intensities.
The present embodiment, the optical system technical indicator achieved being made up of said lens are as follows:
Object-side numerical aperture: 0.08；
Object space imaging size: 25mm；
Object space operating distance: 113mm；
Enlargement ratio: 2.0；
Optics relative distortion :≤0.005%；
Image space imaging size: 50mm；
Object space telecentricity :≤0.022 °；
Image space telecentricity :≤0.014 °；
Optics overall length :≤195mm；
Relative illumination: >=99.2%.
In the example of the utility model, object space telecentricity is no more than 0.022 °, and image space telecentricity is no more than 0.014 °, object space
Telecentricity design can effectively solve the problems, such as fluoroscopy images be distorted, in conjunction with image space telecentricity design may be implemented fixed multiplying power and not by
As the influence of plan-position.The fabulous object space telecentricity design result of the camera lens, illustrate be imaged object plane chief ray will in parallel with
Optical axis, no matter object plane is located at where, all will not influence optical system to the imaging multiplying power of object height.That is, image space
It is constant with the multiplying power of object space, low distortion is provided for camera lens and eliminates the picture acquisition power of the collimation error.In addition, this light
The full filed distortion of system is no more than 0.005%, is much better than identical detection viewing field in the market and detects the optical system of multiplying power,
Measurement error caused by distortion is eliminated, the measurement accuracy of optical system is improved.It can be obtained by the optical index of above-mentioned camera lens
Know, the overall length of the utility model optical system only 195mm, and reaches nearly diffraction limit image quality only with 7 lens, with
Compared with the camera lens of index, which substantially reduces existing object space telecentricity, have it is small in size, light-weight, manufacturing cost is low
The advantages of, be conducive to be promoted on the market.
The essence of the utility model is described in detail in the above specific embodiment, but can not be come with this to this reality
It is limited with novel protection scope.It should be evident that under the enlightenment of the utility model in essence, the common skill of the art
Art personnel can also carry out many improvement and modification, it should be noted that these improvement and modification all fall in the power of the utility model
Within the scope of benefit is claimed.
Claims (5)
1. a kind of miniaturization image bilateral telecentric optical system, it is characterised in that: be included in light along object plane to as plane passes
Broadcast the first lens being arranged successively on direction, the second lens, the third lens, the 4th lens, the 5th lens, aperture diaphragm, the 6th
Lens, the 7th lens；
First lens, the second lens, the third lens, the 4th lens, the 5th lens constitute preceding group of positive light coke, and described the
Six lens and the 7th lens constitute rear group of positive light coke；
If total focal power of the optical system is φ, first lens to the 7th power of lens are followed successively by φ 1
To φ 7, then 1/ φ=0.035 of φ, 3/ φ of φ 2/ φ=0.036, φ=5/ φ of -0.038, φ 4/ φ=0.041, φ=-
7/ φ=0.076 0.013, φ 6/ φ=0.065, φ.
2. a kind of miniaturization image bilateral telecentric optical system according to claim 1, it is characterised in that: described second thoroughly
Mirror and the third lens form double agglutination lens group.
3. a kind of miniaturization image bilateral telecentric optical system according to claim 1, it is characterised in that: described first thoroughly
Mirror uses bent moon using biconvex positive power lens, the third lens using biconvex positive power lens, second lens
Negative-power lenses, the 4th lens are saturating using bent moon negative power using bent moon positive power lens, the 5th lens
Mirror, the 6th lens use bent moon positive power lens using bent moon positive power lens, the 7th lens.
4. a kind of miniaturization image bilateral telecentric optical system according to claim 1, it is characterised in that: described first thoroughly
Mirror front surface radius of curvature is 279.353mm, and rear surface radius of curvature is -92.145mm, center thickness 10.0mm, and lens are logical
Optical port diameter is φ 43.1mm；The second lens front surface radius of curvature be 80.439mm, rear surface radius of curvature be-
83.128mm, center thickness 6.62mm, lens clear aperture are φ 40.6mm；The third lens front surface radius of curvature
For -83.128mm, rear surface radius of curvature is -1621.443mm, and center thickness 1.5mm, lens clear aperture is φ
40.1mm；The 4th lens front surface radius of curvature is 40.460mm, and rear surface radius of curvature is 115.796mm, material center
With a thickness of 9.99mm, lens clear aperture is φ 37.0mm；The 5th lens front surface radius of curvature is 90.034mm, rear table
Curvature radius is 17.589mm, and center thickness 10.0mm, lens clear aperture is φ 13.3mm；Table before 6th lens
Curvature radius is -67.526mm, and rear surface radius of curvature is -47.459mm, center thickness 9.57mm, lens clear aperture
For φ 42.1mm；The 7th lens front surface radius of curvature is -215.047mm, and rear surface radius of curvature is -89.201mm,
Center thickness is 8.22mm, and lens clear aperture is φ 52.2mm.
5. a kind of miniaturization image bilateral telecentric optical system according to claim 1, it is characterised in that: described first thoroughly
Mirror is made of dense flint glass material, second lens are made of fluor crown material, the third lens are using weight
Flint glass material is made, the 4th lens are made of dense crown material, the 5th lens are using dense flint glass
Material is made, the 6th lens are made of dense flint glass material, the 7th lens are using dense flint glass material system
At.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821648895.XU CN208937794U (en) | 2018-10-11 | 2018-10-11 | A kind of miniaturization image bilateral telecentric optical system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821648895.XU CN208937794U (en) | 2018-10-11 | 2018-10-11 | A kind of miniaturization image bilateral telecentric optical system |
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| CN208937794U true CN208937794U (en) | 2019-06-04 |
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| CN201821648895.XU Expired - Fee Related CN208937794U (en) | 2018-10-11 | 2018-10-11 | A kind of miniaturization image bilateral telecentric optical system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109164558A (en) * | 2018-10-11 | 2019-01-08 | 佛山科学技术学院 | A kind of miniaturization image bilateral telecentric optical system |
| CN110426816A (en) * | 2019-08-02 | 2019-11-08 | 佛山科学技术学院 | A kind of miniaturization panorama day and night confocal optical system |
| CN113433680A (en) * | 2021-07-14 | 2021-09-24 | 光虎光电科技(天津)有限公司 | Double-telecentric lens |
-
2018
- 2018-10-11 CN CN201821648895.XU patent/CN208937794U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109164558A (en) * | 2018-10-11 | 2019-01-08 | 佛山科学技术学院 | A kind of miniaturization image bilateral telecentric optical system |
| CN109164558B (en) * | 2018-10-11 | 2023-11-28 | 佛山科学技术学院 | Miniaturized object image bilateral telecentric optical system |
| CN110426816A (en) * | 2019-08-02 | 2019-11-08 | 佛山科学技术学院 | A kind of miniaturization panorama day and night confocal optical system |
| CN110426816B (en) * | 2019-08-02 | 2024-04-30 | 佛山科学技术学院 | Miniaturized panorama day night confocal optical system |
| CN113433680A (en) * | 2021-07-14 | 2021-09-24 | 光虎光电科技(天津)有限公司 | Double-telecentric lens |
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Granted publication date: 20190604 Termination date: 20201011 |