CN109407256A - Lens system for inner hole detection - Google Patents
Lens system for inner hole detection Download PDFInfo
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- CN109407256A CN109407256A CN201811607003.6A CN201811607003A CN109407256A CN 109407256 A CN109407256 A CN 109407256A CN 201811607003 A CN201811607003 A CN 201811607003A CN 109407256 A CN109407256 A CN 109407256A
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- lens
- spherical lens
- positive spherical
- single positive
- negative
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- 238000001514 detection method Methods 0.000 title claims abstract description 11
- 239000011521 glass Substances 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 14
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 6
- 229910052708 sodium Inorganic materials 0.000 claims description 6
- 239000011734 sodium Substances 0.000 claims description 6
- 238000009738 saturating Methods 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 claims description 3
- 239000003814 drug Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003292 glue Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/025—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using glue
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/08—Measuring arrangements characterised by the use of optical techniques for measuring diameters
- G01B11/12—Measuring arrangements characterised by the use of optical techniques for measuring diameters internal diameters
-
- 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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
A kind of technical field of machine vision is used for the lens system of inner hole detection, including diaphragm, first single positive spherical lens, second single positive spherical lens, the positive spherical lens of third list, the 4th single positive spherical lens, the 5th single negative spherical lens, the 6th single positive spherical lens, the 7th single negative spherical lens and the 8th single positive spherical lens being sequentially arranged from the object side to the image side, wherein, 4th single positive spherical lens and the 5th single negative spherical lens group are combined into balsaming lens, and the 6th single positive spherical lens and the 7th single negative spherical lens group are combined into balsaming lens.The present invention is suitable for detecting the inside of the objects such as cylinder, cone, bottle, nut.
Description
Technical field
The present invention relates to a kind of technology of field of machine vision, specifically a kind of camera lens system for inner hole detection
System.
Background technique
China has become machine vision and develops one of most active region at present, and application range contains industry, agriculture
The every field such as industry, military affairs, medicine, traffic, scientific research.Relatively common one of the demand of machine vision industry is exactly using as far as possible
Few camera comprehensively observes object, such as observes top and side or the inside cavity of object in one image
Information, this demand gradually become universal in medicine, drink, automobile and other industries.The method that the prior art is realized mainly passes through
Refraction-reflection type designs camera lens and realizes, although refraction-reflection type design camera lens can satisfy demand, but because it needs additional refracting telescope
Or reflecting mirror, cause structure more complicated.
Summary of the invention
The present invention In view of the above shortcomings of the prior art, proposes a kind of lens system for inner hole detection, fits
For detecting the inside of the objects such as cylinder, cone, bottle, nut.
The present invention is achieved by the following technical solutions:
The present invention includes that the diaphragm being sequentially arranged from the object side to the image side, the first list just spherical lens, second single positive spherical surface are saturating
Mirror, the positive spherical lens of third list, the positive spherical lens of the 4th list, the 5th single negative spherical lens, the 6th single positive spherical lens, the 7th list
Negative spherical lens and the 8th single positive spherical lens, wherein the 4th single positive spherical lens and the 5th single negative spherical lens group are combined into glue
Lens are closed, the 6th single positive spherical lens and the 7th single negative spherical lens group are combined into balsaming lens.
First single positive spherical lens is cancavo-convex positive lens, and convex surface is towards image space；Second single positive spherical lens is
The positive lens of convexo-plane, convex surface is towards image space；The positive spherical lens of third list is the positive lens of convex flat shape, and plane is towards image space；The
Four single positive spherical lenses are lenticular positive lens, and the small convex surface of curvature is towards image space；5th single negative spherical lens is double concave
Negative lens, the big concave surface of curvature is towards image space；6th single positive spherical lens is lenticular positive lens, the small convex surface court of curvature
To image space；7th single negative spherical lens is cancavo-convex negative lens, and convex surface is towards image space；8th single positive spherical lens is lenticular
Positive lens, the big convex surface of curvature is towards image space.
Preferably, F.No=4.5, f=4.5mm, TTL=110mm in the present invention, wherein F.No is the F number of camera lens, and f is
The effective focal length of camera lens, TTL are the optics total length (i.e. the length at diaphragm center to imaging surface) of camera lens.
It is further preferred that the present invention has following optical characteristics:
F/f1=-0.88, f1=-5.11mm；
F/f2=0.56, f2=8.06mm；
F/f3=0.42, f3=10.64mm；
F/f4=0.49, f4=9.25mm；
F/f5=-0.38, f5=-11.82mm；
F/f6=0.41, f6=11.01mm；
F/f7=-0.18, f7=-25.47mm；
F/f8=0.12, f8=37.83mm；
Wherein, f1 is first single positive spherical lens focal length, and f2 is second single positive spherical lens focal length, and f3 is third Dan Zhengqiu
The face focal length of lens, f4 are the 4th single positive spherical lens focal length, and f5 is the 5th single negative spherical lens focal length, and f6 is the 6th single positive spherical surface
The focal length of lens, f7 are the 7th single negative spherical lens focal length, and f8 is the 8th single positive spherical lens focal length.
Preferably, first single positive spherical lens, second single positive spherical lens and the 8th single positive spherical lens are adopted in the present invention
It is made, is met: 1.75 < Nd < 1.85,30 < Vd < 50 of same glass material；
The positive spherical lens of third list, the 5th single negative spherical lens and the 6th single positive spherical lens use same glass material
It is made, meets: 1.55 < Nd < 1.65,45 < Vd < 65；
4th single positive spherical lens and the 7th single negative spherical lens are made of same glass material, are met: 1.75 < Nd
< 1.85,15 < Vd < 35, wherein Nd is refractive index of the glass material to sodium yellow light, and Vd is Abbe of the glass material under sodium yellow light
Number, the wavelength of sodium yellow light are 589.3nm.
Technical effect
Compared with prior art, the present invention has the following technical effect that
1) without by camera lens be put into interior of articles can to the inside of the objects such as cylinder or cone, bottle, nut carry out at
Picture, so that industrial camera can obtain high-definition picture；It is compared with refraction-reflection type camera lens, without additional installation refracting telescope or reflection
Mirror, structure are simpler；
2) visual field >=90 ° can detect the inner diameter range of object from 10mm to 150mm；The depth of field is big, can detect object
Depth is up to 300mm；
3) 8 pieces of different eyeglasses are made using 3 kinds of glass materials, it is at low cost with the lens system that this is constructed.
Detailed description of the invention
Fig. 1 is 1 lens system schematic cross-section of embodiment；
Fig. 2 is the optical cross section figure of embodiment 1；
Fig. 3 is first single positive spherical lens enlarged section in Fig. 1；
Fig. 4 is second single positive spherical lens enlarged section in Fig. 1；
Fig. 5 is the positive spherical lens enlarged section of third list in Fig. 1；
Fig. 6 is the 4th single positive spherical lens enlarged section in Fig. 1；
Fig. 7 is the 5th single negative spherical lens enlarged section in Fig. 1；
Fig. 8 is the 6th single positive spherical lens enlarged section in Fig. 1；
Fig. 9 is the 7th single negative spherical lens enlarged section in Fig. 1；
Figure 10 is the 8th single positive spherical lens enlarged section in Fig. 1；
In figure: the first single positive spherical lens 1, second single positive spherical lens 2, the positive spherical lens 3 of third list, the 4th Dan Zhengqiu
The single negative single positive single negative single positive spherical surface of spherical lens the 7, the 8th of spherical lens the 6, the 7th of spherical lens the 5, the 6th of face lens the 4, the 5th is saturating
Mirror 8, diaphragm 9.
Specific embodiment
With reference to the accompanying drawing and specific embodiment the present invention will be described in detail.
Embodiment 1
As shown in Figure 1, the present embodiment is related to a kind of lens system for inner hole detection, including from the object side to the image side successively
The diaphragm 9, first of arrangement single positive spherical lens 1, second single positive spherical lens 2, the positive spherical lens 3 of third list, the 4th Dan Zhengqiu
The single negative spherical lens 7 of single negative the 5, the 6th list of spherical lens of face lens the 4, the 5th just spherical lens the 6, the 7th and the 8th single positive spherical surface are saturating
Mirror 8, wherein the 4th single positive spherical lens 4 and negative 5 groups of spherical lens of the 5th list are combined into balsaming lens, the 6th single positive spherical lens 6
Balsaming lens is combined into the 7th negative 7 groups of spherical lens of list.
As shown in Fig. 2, OBJ is the inner wall of measured object inner hole in the present embodiment and bottom, IMA are imaging surface；D1 is diaphragm 9
It is the first Dan Zhengqiu with the airspace of first single positive spherical lens 1, center thickness, the d3 that d2 is first single just spherical lens 1
The airspace of face lens 1 and second single positive spherical lens 2, center thickness, the d5 second that d4 is second single positive spherical lens 2
The airspace of single positive spherical lens 2 and the positive spherical lens 3 of third list, center thickness, the d7 that d6 is the positive spherical lens 3 of third list
It is the center of the 4th single positive spherical lens 4 for the positive spherical lens 3 of third list and the airspace of the 4th single positive spherical lens 4, d8
Thickness, d9 are that center thickness, the d10 of the 5th single negative spherical lens 5 are the 5th single negative spherical lens 5 and the 6th single positive spherical lens
6 airspace, the center that center thickness, the d12 that d11 is the 6th single positive spherical lens 6 are the 7th single negative spherical lens 7 are thick
Degree, d13 are the 7th single negative spherical lens 7 and the airspace of the 8th single positive spherical lens 8, d14 are the 8th single positive spherical lens 8
Center thickness.
First single positive the 1, second list of spherical lens just spherical lens 2 and the 8th single positive spherical lens 8 uses in the present embodiment
Same glass material is made, and meets: 1.75 < Nd < 1.85,30 < Vd < 50；Preferably, 1.81 Nd, Vd 41；
The single negative spherical lens 5 of the positive spherical lens the 3, the 5th of third list and the 6th single positive spherical lens 6 use same glass
Material is made, and meets: 1.55 < Nd < 1.65,45 < Vd < 65；Preferably, 1.62 Nd, Vd 56；
4th single positive spherical lens 4 and the 7th single negative spherical lens 7 are made of same glass material, are met: 1.75 <
Nd < 1.85,15 < Vd < 35；Preferably, 1.79 Nd, Vd 25.
As shown in Figures 2 and 3, first single positive spherical lens 1 is cancavo-convex positive lens, front surface range of curvature radius
For -3mm < R11 < -1mm, rear surface range of curvature radius is -6.5mm < R12 < -4.5mm, center thickness range be 1mm < d2 <
3mm；Preferably, front surface radius of curvature R 11 is -2mm, and rear surface radius of curvature R 12 is -5.5mm, and center thickness d2 is
1.86mm；The airspace d1 of diaphragm 9 and first single positive spherical lens 1 is 1.5mm.
As shown in Figure 2 and Figure 4, second single positive spherical lens 2 is the positive lens of convexo-plane, and front surface radius of curvature R 21 is
∞, rear surface range of curvature radius are -7.5mm < R22 < -5.5mm, and center thickness range is 2mm < d4 < 4mm；Preferably, rear table
Curvature radius R22 is -6.5mm, and center thickness d4 is 3.11mm；First single positive spherical lens 1 and second single positive spherical lens 2
Airspace d3 be 0.5mm.
As shown in Figure 2 and Figure 5, the positive spherical lens 3 of third list is the positive lens of convex flat shape, and front surface range of curvature radius is
5.5mm < R31 < 7.5mm, center thickness range are 2mm < d6 < 4mm, and rear surface radius of curvature R 32 is ∞；Preferably, front surface
Radius of curvature R 31 is 6.5mm, and center thickness d6 is 3.11mm；Second single positive spherical lens 2 and the positive spherical lens 3 of third list
Airspace d5 is 0.2mm.
As shown in Figure 2 and Figure 6, the 4th single positive spherical lens 4 is lenticular positive lens, and front surface range of curvature radius is
13.5mm < R41 < 17.5mm, rear surface range of curvature radius be -14mm < R42 < -10mm, center thickness range be 4.5mm < d8 <
6.5mm；Preferably, front surface radius of curvature R 41 is 15.4mm, and rear surface radius of curvature R 42 is -12mm, and center thickness d8 is
5.78mm；The airspace d7 of the positive spherical lens 3 of third list and the 4th single positive spherical lens 4 is 5mm.
As shown in Figure 2 and Figure 7, the 5th single negative spherical lens 5 is concave concave negative lens, front surface range of curvature radius
For -14mm < R51 < -10mm, rear surface range of curvature radius is 18mm < R52 < 22mm, center thickness range be 2.5mm < d9 <
4.5mm；Preferably, front surface radius of curvature R 51 is -12mm, and rear surface radius of curvature R 52 is 20mm, and center thickness d9 is
3.25mm。
As shown in Figure 2 and Figure 8, the 6th single positive spherical lens 6 is lenticular positive lens, and front surface range of curvature radius is
25mm < R61 < 35mm, rear surface range of curvature radius are -9mm < R62 < -7mm, and center thickness range is 5mm < d11 < 7mm；It is excellent
Selection of land, front surface radius of curvature R 61 are 30mm, and rear surface radius of curvature R 62 is -8mm, and center thickness d11 is 6.13mm；5th
The airspace d10 of single negative spherical lens 5 and the 6th single positive spherical lens 6 is 30.7mm.
As shown in Figure 2 and Figure 9, the 7th single negative spherical lens 7 is cancavo-convex negative lens, front surface range of curvature radius
For -9mm < R71 < -7mm, rear surface range of curvature radius is -17.5mm < R72 < -13.5mm, center thickness range be 2.5mm <
d12<4.5mm；Preferably, front surface radius of curvature R 71 is -8mm, and rear surface radius of curvature R 72 is -15.5mm, center thickness
D12 is 3.26mm.
As shown in figs. 2 and 10, the 8th single positive spherical lens 8 is lenticular positive lens, front surface range of curvature radius
For 30mm < R81 < 40mm, rear surface range of curvature radius is -250mm < R82 < -200mm, center thickness range be 3mm < d14 <
5mm；Preferably, front surface radius of curvature R 81 is 35mm, and rear surface radius of curvature R 82 is -225mm, and center thickness d14 is
3.98mm；The airspace d13 of 7th single negative spherical lens 7 and the 8th single positive spherical lens 8 is 20.5mm.
The lens system of the present embodiment can simultaneously detect object inner wall with unification platform camera, and it is straight to can detect inner wall
Diameter range is from 10mm to 150mm, and depth bounds are no more than 300mm, and matched industrial camera target surface is having a size of 1/2 inch.
It is emphasized that: the above is only presently preferred embodiments of the present invention, not make in any form to the present invention
Limitation, any simple modification, equivalent change and modification to the above embodiments according to the technical essence of the invention,
All of which are still within the scope of the technical scheme of the invention.
Claims (5)
1. a kind of lens system for inner hole detection, which is characterized in that including be sequentially arranged from the object side to the image side diaphragm, the
One single positive spherical lens, second single positive spherical lens, the positive spherical lens of third list, the 4th single positive spherical lens, the 5th single negative ball
Face lens, the 6th single positive spherical lens, the 7th single negative spherical lens and the 8th single positive spherical lens, wherein the 4th single positive spherical surface
Lens and the 5th single negative spherical lens group are combined into balsaming lens, and the 6th single positive spherical lens is combined into the 7th single negative spherical lens group
Balsaming lens.
2. the lens system for inner hole detection according to claim 1, characterized in that first single positive spherical lens is
Cancavo-convex positive lens, convex surface is towards image space；Second single positive spherical lens is the positive lens of convexo-plane, and convex surface is towards image space；The
Three single positive spherical lenses are the positive lens of convex flat shape, and plane is towards image space；4th single positive spherical lens is lenticular positive lens,
The small convex surface of curvature is towards image space；5th single negative spherical lens is concave concave negative lens, and the big concave surface of curvature is towards image space；The
Six single positive spherical lenses are lenticular positive lens, and the small convex surface of curvature is towards image space；7th single negative spherical lens is concave-convex
Negative lens, convex surface is towards image space；8th single positive spherical lens is lenticular positive lens, and the big convex surface of curvature is towards image space.
3. the lens system according to claim 1 or claim 2 for inner hole detection, characterized in that the lens system meets:
F.No=4.5, f=4.5mm, TTL=110mm, wherein F.No is the F number of camera lens, and f is the effective focal length of camera lens, and TTL is mirror
The optics total length of head.
4. the lens system for inner hole detection according to claim 3, characterized in that the optical characteristics of the lens system
Are as follows:
F/f1=-0.88, f1=-5.11mm；
F/f2=0.56, f2=8.06mm；
F/f3=0.42, f3=10.64mm；
F/f4=0.49, f4=9.25mm；
F/f5=-0.38, f5=-11.82mm；
F/f6=0.41, f6=11.01mm；
F/f7=-0.18, f7=-25.47mm；
F/f8=0.12, f8=37.83mm；
Wherein, f1 is first single positive spherical lens focal length, and f2 is second single positive spherical lens focal length, and f3 is that the positive spherical surface of third list is saturating
Mirror focal length, f4 are the 4th single positive spherical lens focal length, and f5 is the 5th single negative spherical lens focal length, and f6 is the 6th single positive spherical lens
Focal length, f7 are the 7th single negative spherical lens focal length, and f8 is the 8th single positive spherical lens focal length.
5. the lens system according to claim 1 or claim 2 for inner hole detection, characterized in that described first single positive spherical surface is saturating
Mirror, second single positive spherical lens and the 8th single positive spherical lens are made of same glass material, are met: 1.75 < Nd <
1.85,30 < Vd < 50；
The positive spherical lens of third list, the 5th single negative spherical lens and the 6th single positive spherical lens use same glass material system
At satisfaction: 1.55 < Nd < 1.65,45 < Vd < 65；
4th single positive spherical lens and the 7th single negative spherical lens are made of same glass material, are met: 1.75 < Nd <
1.85,15 < Vd < 35, wherein Nd is refractive index of the glass material to sodium yellow light, and Vd is Abbe of the glass material under sodium yellow light
Number, the wavelength of sodium yellow light are 589.3nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811607003.6A CN109407256B (en) | 2018-12-27 | 2018-12-27 | Lens system for inner hole detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811607003.6A CN109407256B (en) | 2018-12-27 | 2018-12-27 | Lens system for inner hole detection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109407256A true CN109407256A (en) | 2019-03-01 |
| CN109407256B CN109407256B (en) | 2024-01-23 |
Family
ID=65462075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811607003.6A Active CN109407256B (en) | 2018-12-27 | 2018-12-27 | Lens system for inner hole detection |
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| Country | Link |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11326756A (en) * | 1998-05-20 | 1999-11-26 | Cosina Co Ltd | Wide-angle lens |
| US20170248775A1 (en) * | 2016-02-26 | 2017-08-31 | AO Ether Optronics (Shenzhen) Limited | Wide-Angle Lens |
| CN108646394A (en) * | 2018-07-26 | 2018-10-12 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN108761730A (en) * | 2018-06-26 | 2018-11-06 | 浙江舜宇光学有限公司 | Pick-up lens |
| CN209070177U (en) * | 2018-12-27 | 2019-07-05 | 博众精工科技股份有限公司 | Lens system for inner hole detection |
-
2018
- 2018-12-27 CN CN201811607003.6A patent/CN109407256B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11326756A (en) * | 1998-05-20 | 1999-11-26 | Cosina Co Ltd | Wide-angle lens |
| US20170248775A1 (en) * | 2016-02-26 | 2017-08-31 | AO Ether Optronics (Shenzhen) Limited | Wide-Angle Lens |
| CN108761730A (en) * | 2018-06-26 | 2018-11-06 | 浙江舜宇光学有限公司 | Pick-up lens |
| CN108646394A (en) * | 2018-07-26 | 2018-10-12 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN209070177U (en) * | 2018-12-27 | 2019-07-05 | 博众精工科技股份有限公司 | Lens system for inner hole detection |
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| Publication number | Publication date |
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| CN109407256B (en) | 2024-01-23 |
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