CN209044161U - A kind of double-view field doubly telecentric camera lens of built-in coaxial illumination - Google Patents
A kind of double-view field doubly telecentric camera lens of built-in coaxial illumination Download PDFInfo
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- CN209044161U CN209044161U CN201821885600.0U CN201821885600U CN209044161U CN 209044161 U CN209044161 U CN 209044161U CN 201821885600 U CN201821885600 U CN 201821885600U CN 209044161 U CN209044161 U CN 209044161U
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Abstract
The utility model discloses a kind of double-view field doubly telecentric camera lenses of built-in coaxial illumination, including the first lens set, the first spectroscope, the first diaphragm, the second lens set and the first image planes being sequentially arranged along image path；The second diaphragm, third lens set and the second image planes have been sequentially arranged on first spectroscopical light splitting optical path, the third lens set includes the second spectroscope, it has been sequentially arranged the 4th lens set and third image planes on second spectroscopical light splitting optical path, has been provided with lighting source in the third image planes.The utility model can solve the problems, such as that existing telecentric lens aberration is big and limits measured object height.
Description
Technical field
The utility model relates to telecentric lens technical field, especially a kind of double-view field doubly telecentric mirror of built-in coaxial illumination
Head.
Background technique
Telecentric lens mainly design to correct traditional industry camera lens parallax, it can be in certain object distance range
The image enlargement ratio made will not change, this is very important application to situation of the measured object not on same object plane,
It is widely used on various vision imaging detection devices.
Existing double-view field doubly telecentric camera lens is this to be achieved in that in tested object plane usually using exterior arrangement axis light
The spectroscope that 45 degree of angle is added between camera lens, since the front of camera lens, the error that spectroscope generates is arranged in spectroscope
It can amplify because of camera lens, to generate biggish aberration, reduce the optical resolution of camera lens, cannot get the small illumination of telecentricity
Light.Meanwhile the spectroscope added increases the distance between tested object plane and camera lens, also limits the height of measured object.
Utility model content
The utility model provides a kind of double-view field doubly telecentric camera lens of built-in coaxial illumination, solves existing telecentric lens aberration
The problem of greatly and limiting measured object height.
The utility model provides a kind of double-view field doubly telecentric camera lens of built-in coaxial illumination, including sequentially sets along image path
The first lens set, the first spectroscope, the first diaphragm, the second lens set and the first image planes set；First spectroscopical light splitting
The second diaphragm, third lens set and the second image planes are sequentially arranged in optical path, the third lens set includes the second spectroscope, institute
It states and has been sequentially arranged the 4th lens set and third image planes on second spectroscopical light splitting optical path, be provided with photograph in the third image planes
Mingguang City source.
Preferably, first lens set includes the first lens, the second lens and the third lens being sequentially arranged；Second mirror
Piece group includes the 4th lens, the 5th lens, the 6th lens, the 7th lens and the 8th lens being sequentially arranged；The third eyeglass
Group further includes the 9th lens, the tenth lens, the 11st lens and the 12nd lens being sequentially arranged, the second spectroscope setting
Between the 9th lens and the tenth lens；4th lens set further includes being sequentially arranged including the 13rd lens, the 14th
Lens and the 15th lens.
Preferably, first lens are biconvex spherical surface positive lens, and the second lens are biconvex spherical surface positive lens, the third lens
The cemented doublet closed for concave-convex spherical surface negative lens and concave-convex spherical surface positive lens groups；4th lens are that concave-convex spherical surface is just saturating
Mirror, the 5th lens are concave-convex spherical surface negative lens, and the 6th lens are concave-convex spherical surface positive lens, and the 7th lens are that biconvex spherical surface is just saturating
Mirror, the 8th lens are the cemented doublet that biconvex spherical surface positive lens and concave-concave spherical surface negative lens combine；9th lens are double
Convex spherical positive lens and concave-concave spherical surface negative lens combination cemented doublet, the tenth lens be biconvex spherical surface positive lens, the 11st
Lens are the cemented doublet that convex-concave spherical surface negative lens and convex-concave spherical surface negative lens combine, and the 12nd lens convex-concave spherical surface is just saturating
Mirror, the 13rd lens are biconvex spherical surface positive lens, and the 14th lens are convex-concave spherical surface negative lens, and the 15th lens are convex-concave
Spherical surface positive lens.
Preferably, first lens are successively to the spacing of the second lens and the spacing of the second lens to the third lens:
2.05 ± 5%, 32.63 ± 5%；Distance of first lens set to first spectroscopical airspace on optical axis be 68.78 ±
5%, distance of the air spacing of the first spectroscope to the first diaphragm on optical axis is 4.5 ± 5%, the first diaphragm to the second eyeglass
The air spacing of group is 4.5 ± 5%, and the 4th lens to the 5th lens, the 5th lens to the 6th lens, the 6th lens to the 7th are thoroughly
The spacing of mirror and the 7th lens to the 8th lens is successively: 4.26 ± 5%, 3.07 ± 5%, 2.29 ± 5%, 2 ± 5%, first
Distance of the air spacing on optical axis of spectroscope to the second diaphragm is -4.5 ± 5%, the second diaphragm to third rear lens group
Air spacing is -4.5 ± 5%, the 9th lens to the second spectroscope, the second spectroscope to the tenth lens, the tenth lens to the tenth
One lens, the 11st lens to the 12nd lens spacing be successively: -18.64 ± 5%, -4.37 ± 5%, -3.54 ± 5%, -
3.62 ± 5%, distance of the air spacing of the second spectroscope to the 4th lens set on optical axis is 4.37 ± 5%, and the 13rd thoroughly
The spacing of mirror to the 14th lens, the 14th lens to the 15th lens is successively: 5.5 ± 5%, 2 ± 5%, the list of each distance
Position is millimeter.
Preferably, first spectroscope and the second spectroscope are the Amici prism with 45 degree of light splitting surfaces.
In the utility model, without spectroscope being arranged in front of camera lens to introduce external light source, but in the rear end of optical path
Built-in coaxial illumination light, the aberration of coaxial-illuminating light ensure that the optical resolution of camera lens without going past the amplification of lens, thus
The small illumination light of available telecentricity.Meanwhile illumination light is not between tested object plane and camera lens, is tested object plane to camera lens
Between scope of activities increase, expand measurable altitude range.
Detailed description of the invention
Fig. 1 is the structural representation for the double-view field doubly telecentric camera lens that a kind of built-in coaxial of embodiment of the utility model illuminates
Figure；
Fig. 2 is a kind of structural schematic diagram of the first lens set of embodiment of the utility model；
Fig. 3 is a kind of structural schematic diagram of the second lens set of embodiment of the utility model；
Fig. 4 is a kind of structural schematic diagram of the third lens set of embodiment of the utility model；
Fig. 5 is a kind of structural schematic diagram of the 4th lens set of embodiment of the utility model；
Fig. 6 is a kind of figure of optical lens preferred embodiment of the first view field imaging optical path of embodiment of the utility model；
Fig. 7 is a kind of distortion figure of the first view field imaging optical path of embodiment of the utility model；
Fig. 8 is a kind of relative illumination figure of the first view field imaging optical path of embodiment of the utility model；
Fig. 9 is a kind of modulation transfer function figure of the first view field imaging optical path of embodiment of the utility model；
Figure 10 is a kind of figure of optical lens preferred embodiment of the second view field imaging optical path of embodiment of the utility model；
Figure 11 is a kind of distortion figure of the second view field imaging optical path of embodiment of the utility model；
Figure 12 is a kind of relative illumination figure of the second view field imaging optical path of embodiment of the utility model；
Figure 13 is a kind of modulation transfer function figure of the second view field imaging optical path of embodiment of the utility model；
Figure 14 is a kind of modulation transfer function figure of the coaxial-illuminating optical path of embodiment of the utility model.
Specific embodiment
The utility model is described in further detail below by specific embodiment combination attached drawing.
The utility model embodiment provides a kind of double-view field doubly telecentric camera lens of built-in coaxial illumination, as shown in Figure 1, it is wrapped
Include the first lens set G1 being sequentially arranged along image path, the first spectroscope BS1, the first diaphragm STP1, the second lens set G2 and
First image planes I1, the first lens set G1, the first spectroscope BS1, the first diaphragm STP1, the second lens set G2 and the first image planes I1 are suitable
Secondary coaxial arrangement, the light that tested object plane Obj is generated successively pass through the first lens set G1, the first spectroscope BS1, the first diaphragm
STP1, the second lens set G2 and the first image planes I1 form the first view field imaging optical path, and can be imaged on the first image planes I1.The
One spectroscope BS1 can be Amici prism, the light splitting surface with 45 degree of angles, therefore, the axial direction of the light splitting optical path of formation and first
View field imaging optical path it is axially vertical.
Be sequentially arranged on the light splitting optical path of the first spectroscope BS1 the second diaphragm STP2, third lens set G3 and
Second image planes I2, imaging ray is after light splitting, sequentially through the second diaphragm STP2, third lens set G3 and the second image planes I2,
First lens set G1, the first spectroscope BS1, the second diaphragm STP2, third lens set G3 and the second image planes I2 form the second visual field
Imaging optical path.Include that the second spectroscope BS2, the second spectroscope BS2 is also possible to Amici prism in the third lens set G3, has
There is the light splitting surface at 45 degree of angles, therefore, the axial direction of the light splitting optical path of formation is axially vertical with the second view field imaging optical path.
It has been sequentially arranged the 4th lens set G4 and third image planes I3 on the light splitting optical path of the second spectroscope BS2, described
It is provided with lighting source on three image planes I3, forms built-in illumination light, illumination light is after lighting source sending, sequentially through the 4th
Lens set G4, the second spectroscope BS2, the part in third lens set G3, the second diaphragm STP2, the first spectroscope BS1 and first
Lens set G1 is finally irradiated on object plane Obj.
In one embodiment, as Figure 2-Figure 5, the first lens set G1 includes the first lens being sequentially arranged
L1, the second lens L2 and the third lens L3, the second lens set G2 include the 4th lens L4 being sequentially arranged, the 5th lens L5,
Six lens L6, the 7th lens L7 and the 8th lens L8；The third lens set G3 further includes the 9th lens L9 being sequentially arranged,
Ten lens L10, the 11st lens L11 and the 12nd lens L12, the second spectroscope BS2 setting is in the 9th lens L9 and the
Between ten lens L10；The 4th lens set G4 further includes the 13rd lens L13 being sequentially arranged, the 14th lens L14 and
15 lens L15.
Further, first lens are biconvex spherical surface positive lens, the first face and the second face including being convex surface, the
Two lens are biconvex spherical surface positive lens, and third face and fourth face including being convex surface, the third lens are concave-convex spherical surface negative lens
With concave-convex spherical surface positive lens groups close cemented doublet, including for concave surface the 5th face, be convex-concave cemented surface the 6th face, be convex
7th face in face；4th lens are concave-convex spherical surface positive lens, including the octahedral for concave surface and be convex surface the 9th face, the
Five lens are concave-convex spherical surface negative lens, including the tenth face for concave surface and be convex surface the tenth one side, the 6th lens are concave-convex ball
Face positive lens, including the 12nd face for concave surface and be convex surface the 13rd face, the 7th lens be biconvex spherical surface positive lens, including
It is the tenth four sides and the 15th face on convex surface, the 8th lens are pair that biconvex spherical surface positive lens and concave-concave spherical surface negative lens combine
Balsaming lens, including for convex surface the 16th face, be convex-concave cemented surface the 17th face, be concave surface the tenth octahedral；Described
Nine lens are the cemented doublet that biconvex spherical surface positive lens and concave-concave spherical surface negative lens combine, including for convex surface the 19th face,
For convex-concave cemented surface the 20th face, be concave surface the 20th one side, it including is convex that the tenth lens, which are biconvex spherical surface positive lens,
22nd face in face and the 23rd face, the 11st lens are pair that convex-concave spherical surface negative lens and convex-concave spherical surface negative lens combine
Balsaming lens, including for convex surface the 20th four sides, be convex-concave cemented surface the 25th face, be concave surface the 26th face,
12nd lens convex-concave spherical surface positive lens, including the 27th face for convex surface and be concave surface the 20th octahedral；Described tenth
Three lens are biconvex spherical surface positive lens, and the 29th face and the 30th face including being convex surface, the 14th lens are convex-concave ball
Face negative lens, including for convex surface the 30th one side and be concave surface the 32nd face, the 15th lens be convex-concave spherical surface it is just saturating
Mirror, including the 33rd face for convex surface and be concave surface the 30th four sides.
Fig. 6-Figure 14 shows technical effect acquired by the utility model embodiment by experimental diagrams, and Fig. 6 is to implement
The figure of optical lens preferred embodiment of first view field imaging optical path of the double-view field doubly telecentric camera lens of the built-in coaxial illumination in example, OBJ indicate object space
Visual field, IMA indicate that image space corresponds to visual field, and unit is all millimeter.Airy Radius indicates Airy radius, RMS radius table
Show figure of optical lens preferred embodiment root mean square radii, unit is all micron.From fig. 6, it can be seen that Airy radius is 3.583 μm, central vision
The disc of confusion radius of position is 1.361 μm, and the disc of confusion radius of peripheral field points is 2.469 μm, and entire field range is more
Speckle radius is less than Airy radius, has reached good imaging effect.
Fig. 7 is the distortion of the first view field imaging optical path of the double-view field doubly telecentric camera lens of the built-in coaxial illumination in embodiment
Figure, ordinate are true field, and unit is millimeter, and abscissa is distortion value as a percentage.From figure 7 it can be seen that whole
Distortion value in a field range is both less than 0.05%, and camera lens the first view field imaging optical path has very low distortion.
Fig. 8 is the opposite of the first view field imaging optical path of the double-view field doubly telecentric camera lens of the built-in coaxial illumination in embodiment
Illumination figure, ordinate are to contrast angle value, and abscissa is true field, and unit is millimeter.From figure 8, it is seen that entire visual field
Relative illumination variation of the relative illumination in 92% or more, the entire field range of camera lens the first view field imaging optical path in range
Very little.
Fig. 9 is the modulation of the first view field imaging optical path of the double-view field doubly telecentric camera lens of the built-in coaxial illumination in embodiment
Transmission function MTF figure, ordinate indicate MTF value, abscissa representation space frequency, unit be line it is right/millimeter (lp/mm).
Tangential indicates the mtf value of meridian direction, and Sagittal indicates that arc loses the mtf value in direction, from fig. 9, it can be seen that each
The mtf value that the mtf value and arc of the meridian direction of visual field lose direction is all larger than 0.3 in spatial frequency for the mtf value at 174lp/mm,
The enlargement ratio of first view field imaging optical path is -0.141 times, it is hereby achieved that the optical resolution of the first view field imaging optical path
It can achieve 21 μm.
Second view field imaging optical path of the double-view field doubly telecentric camera lens that Figure 10 illuminates for the built-in coaxial in embodiment is more
Speckle pattern, OBJ indicate that true field, IMA indicate that image space corresponds to visual field, and unit is all millimeter.AiryRadius indicates Airy
Radius, RMSradius indicate figure of optical lens preferred embodiment root mean square radii, and unit is all micron.From fig. 10 it can be seen that Airy radius is
3.574 μm, the disc of confusion radius of central vision position is 1.522 μm, and the disc of confusion radius of peripheral field points is 1.922 μm,
The disc of confusion radius of entire field range is less than Airy radius, has reached good imaging effect.
Figure 11 is the abnormal of the second view field imaging optical path of the double-view field doubly telecentric camera lens of the built-in coaxial illumination in embodiment
Become figure, ordinate is true field, and unit is millimeter, and abscissa is distortion value as a percentage.It can be seen from figure 11 that
Distortion value in entire field range is both less than 0.05%, and camera lens the second view field imaging optical path has very low distortion.
Figure 12 is the phase of the second view field imaging optical path of the double-view field doubly telecentric camera lens of the built-in coaxial illumination in embodiment
To illumination figure, ordinate is to contrast angle value, and abscissa is true field, and unit is millimeter.It can be recognized from fig. 12 that entire view
Relative illumination of the relative illumination in 99% or more, the entire field range of camera lens the second view field imaging optical path in the range of field becomes
Change very little.
Figure 13 is the tune of the second view field imaging optical path of the double-view field doubly telecentric camera lens of the built-in coaxial illumination in embodiment
Modulation trnasfer function MTF figure, ordinate indicate MTF value, abscissa representation space frequency, unit be line it is right/millimeter (lp/mm).
Tangential indicates the mtf value of meridian direction, and Sagittal indicates that arc loses the mtf value in direction, as can be seen from Figure 13, each
The mtf value that the mtf value and arc of the meridian direction of visual field lose direction is all larger than 0.3 in spatial frequency for the mtf value at 180lp/mm,
The enlargement ratio of first view field imaging optical path is -0.43 times, it is hereby achieved that the optical resolution of the second view field imaging optical path
It can achieve 6.5 μm.
Figure 14 is that the modulation of the coaxial-illuminating optical path of the double-view field doubly telecentric camera lens of the built-in coaxial illumination in embodiment passes
Delivery function MTF figure, ordinate indicate MTF value, abscissa representation space frequency, unit be line it is right/millimeter (lp/mm).
Tangential indicates the mtf value of meridian direction, and Sagittal indicates that arc loses the mtf value in direction, it is seen from figure 14 that entirely
MTF curve in field range is compact, and in actual use, light-emitting surface is arranged, in object plane in coaxial-illuminating optical path at image planes I3
Available telecentricity is small at the face Obj, illumination light of high resolution.
Telecentricity coaxial-illuminating may be implemented in the utility model it can be seen from above-mentioned experimental data, and two kinds of models may be implemented
The imaging enclosed, the first view field imaging optical path are suitable for the visual field of 100mm or so, and the second view field imaging optical path is suitable for 25mm or so
Visual field, the two all corrects distortion well, and distortion value can obtain the good telecentricity of object space, object less than 0.05%
21 μm of optical resolutions may be implemented less than 0.03 degree, to 100mm visual field in square telecentricity, may be implemented 6.5 μm to 25mm visual field
Optical resolution.
The above content is combine specific embodiment further detailed description of the utility model, and it cannot be said that
The specific implementation of the utility model is only limited to these instructions.For the utility model person of an ordinary skill in the technical field
For, without departing from the concept of the premise utility, a number of simple deductions or replacements can also be made.
Claims (5)
1. a kind of double-view field doubly telecentric camera lens of built-in coaxial illumination, it is characterised in that:
Including the first lens set, the first spectroscope, the first diaphragm, the second lens set and the first picture being sequentially arranged along image path
Face；The second diaphragm, third lens set and the second image planes, the third have been sequentially arranged on first spectroscopical light splitting optical path
Lens set includes the second spectroscope, has been sequentially arranged the 4th lens set and third picture on second spectroscopical light splitting optical path
Face is provided with lighting source in the third image planes.
2. double-view field doubly telecentric camera lens according to claim 1, it is characterised in that:
First lens set includes the first lens, the second lens and the third lens being sequentially arranged；Second lens set includes suitable
The 4th lens, the 5th lens, the 6th lens, the 7th lens and the 8th lens of secondary setting；The third lens set further includes suitable
The 9th lens, the tenth lens, the 11st lens and the 12nd lens of secondary setting, second spectroscope are arranged in the 9th lens
And the tenth between lens；4th lens set further includes being sequentially arranged including the 13rd lens, the 14th lens and the tenth
Five lens.
3. double-view field doubly telecentric camera lens according to claim 2, it is characterised in that:
First lens are biconvex spherical surface positive lens, and the second lens are biconvex spherical surface positive lens, and the third lens are concave-convex spherical surface
The cemented doublet that negative lens and concave-convex spherical surface positive lens groups are closed；4th lens are concave-convex spherical surface positive lens, the 5th lens
For concave-convex spherical surface negative lens, the 6th lens are concave-convex spherical surface positive lens, and the 7th lens are biconvex spherical surface positive lens, and the 8th lens are
The cemented doublet of biconvex spherical surface positive lens and the combination of concave-concave spherical surface negative lens；9th lens be biconvex spherical surface positive lens and
The cemented doublet of concave-concave spherical surface negative lens combination, the tenth lens are biconvex spherical surface positive lens, and the 11st lens are convex-concave spherical surface
The cemented doublet of negative lens and the combination of convex-concave spherical surface negative lens, the 12nd lens convex-concave spherical surface positive lens, the described 13rd thoroughly
Mirror is biconvex spherical surface positive lens, and the 14th lens are convex-concave spherical surface negative lens, and the 15th lens are convex-concave spherical surface positive lens.
4. double-view field doubly telecentric camera lens according to claim 2, it is characterised in that:
First lens are successively to the spacing of the second lens and the spacing of the second lens to the third lens: 2.05 ± 5%,
32.63 ± 5%；Distance of first lens set to first spectroscopical airspace on optical axis is 68.78 ± 5%, first point
Distance of the air spacing on optical axis of light microscopic to the first diaphragm is 4.5 ± 5%, between the air of the first diaphragm to the second lens set
Away from being 4.5 ± 5%, the 4th lens to the 5th lens, the 5th lens to the 6th lens, the 6th lens to the 7th lens and the 7th are thoroughly
The spacing of mirror to the 8th lens is successively: 4.26 ± 5%, 3.07 ± 5%, 2.29 ± 5%, 2 ± 5%, the first spectroscope to
Distance of the air spacing of two diaphragms on optical axis is -4.5 ± 5%, the air spacing of the second diaphragm to third rear lens group is -
4.5 ± 5%, the 9th lens to the second spectroscope, the second spectroscope to the tenth lens, the tenth lens to the 11st lens, the tenth
The spacing of one lens to the 12nd lens is successively: -18.64 ± 5%, -4.37 ± 5%, -3.54 ± 5%, -3.62 ± 5%,
Distance of the air spacing of second spectroscope to the 4th lens set on optical axis is 4.37 ± 5%, the 13rd lens to the 14th
Lens, the 14th lens to the 15th lens spacing be successively: 5.5 ± 5%, 2 ± 5%, the unit of each distance is millimeter.
5. double-view field doubly telecentric camera lens according to claim 1-4, it is characterised in that:
First spectroscope and the second spectroscope are the Amici prism with 45 degree of light splitting surfaces.
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| CN201821885600.0U CN209044161U (en) | 2018-11-16 | 2018-11-16 | A kind of double-view field doubly telecentric camera lens of built-in coaxial illumination |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109307927A (en) * | 2018-11-16 | 2019-02-05 | 珠海博明软件有限公司 | A kind of double-view field doubly telecentric camera lens of built-in coaxial illumination |
| CN110530291A (en) * | 2019-08-26 | 2019-12-03 | 珠海博明视觉科技有限公司 | A kind of auto-focusing algorithm that grating project height is rebuild |
-
2018
- 2018-11-16 CN CN201821885600.0U patent/CN209044161U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109307927A (en) * | 2018-11-16 | 2019-02-05 | 珠海博明软件有限公司 | A kind of double-view field doubly telecentric camera lens of built-in coaxial illumination |
| CN109307927B (en) * | 2018-11-16 | 2024-02-20 | 珠海博明软件有限公司 | Built-in coaxial illumination's two telecentric lens of two visual fields |
| CN110530291A (en) * | 2019-08-26 | 2019-12-03 | 珠海博明视觉科技有限公司 | A kind of auto-focusing algorithm that grating project height is rebuild |
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