CN211206931U - Big low distortion machine vision camera lens of 35mm focus of light that leads to high definition - Google Patents
Big low distortion machine vision camera lens of 35mm focus of light that leads to high definition Download PDFInfo
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- CN211206931U CN211206931U CN201922017881.9U CN201922017881U CN211206931U CN 211206931 U CN211206931 U CN 211206931U CN 201922017881 U CN201922017881 U CN 201922017881U CN 211206931 U CN211206931 U CN 211206931U
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Abstract
The utility model relates to a large-light-transmission 35mm focal length high-definition low-distortion machine vision lens, which comprises a front lens group, a diaphragm and a rear lens group, wherein the front lens group, the diaphragm and the rear lens group are arranged in a lens structure in sequence along the light incidence direction; the front group of lenses sequentially consists of a negative meniscus lens, a first positive meniscus lens, a first biconvex lens and a first biconcave lens which are tightly connected, and the rear group of lenses sequentially comprises from front to back: the lens has the characteristics of large light transmission, low distortion and the like, and a focusing method adopts a half-group translation focusing method, so that high-definition imaging of the lens in close-range shooting is ensured; high resolution imaging of better than 2000 thousand pixels can be provided for machine vision systems. The machine vision lens is used for vision-related detection applications such as liquid crystal display dead pixel detection, FPC assembly detection, circuit board detection and the like.
Description
Technical Field
The utility model relates to a low distortion machine vision camera lens of big light-passing 35mm focus high definition.
Background
With the rapid development of machine vision, the small-light-passing small-target-surface machine vision detection lens cannot completely meet all vision detection industries; with the development of the electronic industry, especially the detection of liquid crystal display panels, mobile phone circuit boards and the like needs a larger target surface and a larger light-transmitting lens to replace the detection.
SUMMERY OF THE UTILITY MODEL
In view of the not enough of prior art, the utility model aims to solve the technical problem that a low distortion machine vision camera lens of 35mm focus of big light that leads to is provided, not only rational in infrastructure, optical property is high moreover, the formation of image target surface is big, lead to the light bore big, resolution ratio is superior to 2000 ten thousand pixels high resolution imaging and distortion and is less than 0.4%.
In order to solve the technical problem, the technical scheme of the utility model is that: a large-light-transmission 35mm focal length high-definition low-distortion machine vision lens comprises a front group of lenses, a diaphragm and a rear group of lenses which are arranged in a lens structure in sequence along the incident direction of light rays; the front group of lenses sequentially consists of a negative meniscus lens, a first positive meniscus lens, a first biconvex lens and a first biconcave lens which are tightly connected, and the rear group of lenses sequentially comprises from front to back: a second bonding group formed by the close connection of the second biconcave lens and the second biconvex lens, a third biconvex lens and a second positive meniscus lens.
Further, the air space between the negative meniscus lens and the first positive meniscus lens is 12.07mm, and the air space between the first positive meniscus lens and the first bonding group is 3.62 mm.
Further, the air space between the front group of lenses and the rear group of lenses is 10.19mm, the air space between the front group of lenses and the diaphragm is 1.34mm, and the air space between the diaphragm and the rear group of lenses is 8.85 mm.
Further, an air space between the second adhesive group and the third biconvex lens is 0.1mm, and an air space between the third biconvex lens and the second positive meniscus lens is: 0.94 mm.
Further, the lens structure comprises a front group barrel for mounting a front group lens, the rear side of the front group barrel is connected with a main barrel, a rear group barrel for mounting a rear group lens is arranged in the main barrel, the rear group barrel is matched with the front group barrel through 3 first countersunk head screws and is fastened in a threaded manner, so that integrated linkage is formed, and a diaphragm adjusting mechanism is arranged on the main barrel; and the main cylinder is also provided with a focusing mechanism.
Further, the negative meniscus lens, the first positive meniscus lens, the first biconvex lens and the first biconcave lens are sequentially arranged in the front group cylinder from front to back; a first space ring is arranged between the negative meniscus lens and the first positive meniscus lens, a second space ring is arranged between the first positive meniscus lens and the first gluing group, and a front pressing ring pressed on the front side of the negative meniscus lens is screwed in the front group cylinder.
Furthermore, the second biconcave lens, the second biconvex lens and the third biconvex lens are sequentially arranged in the rear group cylinder from front to back, a third space ring is arranged between the second gluing group and the third biconvex lens, a middle pressure ring is arranged outside the third biconvex lens and matched with the rear group cylinder, a connecting flange is sleeved outside the rear end of the main cylinder, and the connecting flange is connected with the rear pressure ring through threads and assembled with the second positive meniscus lens.
Further, the diaphragm adjustment mechanism includes that the cover arranges the diaphragm ring at a main section of thick bamboo middle part in, radial spiro union has the diaphragm guide nail that passes a main section of thick bamboo and stretch into the back group section of thick bamboo on the diaphragm ring, the diaphragm guide nail is connected with the diaphragm, still be provided with on the diaphragm adjustable ring and cooperate the diaphragm fastening screw that is used for diaphragm ring locking with a main section of thick bamboo.
Furthermore, the focusing mechanism comprises a focusing cam arranged on the main barrel, the rear end of an inner ring of the focusing cam is in threaded connection with an outer ring of the front end of the main barrel, the rear end of an outer ring of the focusing cam is in threaded connection with an inner ring of the front end of an outer cover of the main barrel, a focusing ring is further fixed on the focusing cam, and a focusing fastening screw for locking the focusing cam is in threaded connection with the main barrel in the radial direction.
Compared with the prior art, the utility model discloses following beneficial effect has:
eight pieces of optical glass materials of six groups of the system are reasonably selected and matched in the light path through elaborate design, and the difference of refractive index and dispersion between the bonding combination lenses is utilized, so that aberration is effectively corrected, the MTF value of the lens is enabled to be more than or equal to 0.75 at the center of 150lp/mm, the MTF value at the edge of 150lp/mm is more than or equal to 0.35, and the resolution of the lens is enabled to be better than 2000 ten thousand pixels.
The lens has the characteristics of large light transmission, low distortion and the like, and the focusing method adopts a half-group translation focusing method, so that high-definition imaging of the lens shot in a short distance is ensured, and the distortion is less than 0.4%.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Drawings
Fig. 1 is a schematic structural diagram of an optical path system according to an embodiment of the present invention;
fig. 2 is an exploded schematic view of a lens structure according to an embodiment of the present invention;
fig. 3 is a MTF graph of an embodiment of the present invention;
fig. 4 is a graph illustrating the distortion change according to the embodiment of the present invention.
In the figure: 1-a focusing ring, 2-a front pressing ring, 3-a first spacer, 4-a second spacer, 5-a front group barrel, 6-a pin, 7-a first cone end screw, 8-a first countersunk screw, 9-a focusing cam, 10-a main barrel, 11-a rear group barrel, 12-a third spacer, 13-a middle pressing ring, 14-a rear pressing ring, 15-a main barrel housing, 16-a diaphragm ring, 17-a connecting flange, 18-a second cone end screw, 19-a negative meniscus lens, 20-a first positive meniscus lens, 21-a first glue group, 22-a diaphragm, 23-a spiral chute, 24-a double U straight guide groove, 25-a limiting groove, 26-a second glue group, 27-a third biconvex lens, 28-a second positive meniscus lens, 29-focusing fastening screw, 30-second countersunk screw, 31-diaphragm guide screw, 32-diaphragm fastening screw, 33-third countersunk screw, 36-first biconvex lens, 37-first biconcave lens, 38-second biconcave lens, 39-second biconvex lens, A-front group lens and B-rear group lens.
Detailed Description
As shown in fig. 1 to 4, a high-pass 35mm focal length high-definition low-distortion machine vision lens comprises a front group lens a, a diaphragm 16 and a rear group lens B which are arranged in a lens structure in sequence along a light incidence direction, wherein the front group lens comprises a negative meniscus lens 19, a first positive meniscus lens 20, a first biconvex lens 36 and a first adhesive group 21 tightly connected with a first biconcave lens 37 in sequence from front to back, the rear group lens comprises a second adhesive group 26, a third biconvex lens 27 and a second positive meniscus lens 28 tightly connected with a second biconcave lens 38 and a second biconvex lens 39 in sequence from front to back, and the overall shape and size of the lens is designed to be phi 42.0mm × 74.7.7 mm.
In an embodiment of the present invention, an air space between the negative meniscus lens and the first positive meniscus lens is 12.07mm, and an air space between the first positive meniscus lens and the first adhesive composition is 3.62 mm.
In the embodiment of the utility model provides an in, the air space between front group lens and the back group lens is 10.19mm, and the air space between front group lens and the diaphragm is 1.34mm, and the air space between diaphragm and the back group lens is 8.85 mm.
In an embodiment of the present invention, an air space between the second glue combination and the third biconvex lens is 0.1mm, and an air space between the third biconvex lens and the second positive meniscus lens is: 0.94 mm.
In the embodiment of the present invention, the refractive index and dispersion difference between the cemented lens assembly is used in the optical path design, so as to effectively correct the aberration; the lens has the characteristics of large light transmission, low distortion and the like, and a half-group translation focusing method is adopted in the focusing method, so that high-definition imaging of the lens in close-range shooting is ensured; high resolution imaging of better than 2000 thousand pixels can be provided for machine vision systems.
In the embodiment of the present invention, the lens structure includes a front barrel 5 for mounting a front lens, the rear side of the front barrel is connected to a main barrel 10, a rear barrel 11 for mounting a rear lens is disposed in the main barrel, the rear barrel is matched with the front barrel by three first countersunk head screws 8 and is fastened by screw threads, so as to form an integral linkage, and a diaphragm adjusting mechanism is disposed on the main barrel; and the main cylinder is also provided with a focusing mechanism.
In an embodiment of the present invention, the negative meniscus lens, the first positive meniscus lens, the first biconvex lens, and the first biconcave lens are sequentially disposed in the front group cylinder from front to back; a first space ring 3 is arranged between the negative meniscus lens and the first positive meniscus lens, a second space ring 4 is arranged between the first positive meniscus lens and the first glue group, and a front pressing ring 2 pressed on the front side of the negative meniscus lens is also screwed in the front group cylinder; this preceding group section of thick bamboo, the space ring, preceding clamping ring is by one shot forming of turnning and milling compounding machine, the uniformity is stronger, the precision is higher, the concentricity of each internal diameter of effectual group section of thick bamboo of assurance, the axiality of lens assembly has been guaranteed, wherein first space ring, second space ring and first positive meniscus lens, the convex surface of first veneer group holds the department of leaning on and has adopted C0.1 chamfer to hold and lean on, make the lens be difficult to the mar, do not produce the split edge, and can effectually guarantee the air distance between its lens, main section of thick bamboo overcoat is equipped with a main section of thick bamboo dustcoat 15, this main section of thick bamboo dustcoat periphery is locked with a main section of thick bamboo through three second countersunk screw 30 and attaches fixedly.
In the embodiment of the present invention, the second biconcave lens, the second biconvex lens and the third biconvex lens are sequentially disposed in the rear group cylinder from front to back, a third space ring 12 is disposed between the second cemented group and the third biconvex lens, a middle pressure ring 13 is disposed outside the third biconvex lens to match with the rear group cylinder, a connecting flange 17 is disposed outside the rear end of the main cylinder, and the connecting flange is assembled with the second positive meniscus lens by screwing the rear pressure ring; the designed third space ring is used for ensuring the air distance between the lenses, and the inner wall of the third space ring is designed into an extinction step line, so that the refraction of invalid light rays is effectively avoided, and the imaging quality of the lens is improved; the middle pressing ring is matched with the rear group cylinder and is used for ensuring the assembly coaxiality and stability of the rear group of three lenses and two groups of lenses; in order to realize half-group movement of the lens, the inner wall of the connecting flange is sleeved on the periphery of the main cylinder, and is matched with the bearing surface and locked and fixed by three third countersunk head screws 33, so that a half-group type translation focusing method is realized.
In the embodiment of the present invention, the diaphragm adjusting mechanism includes a diaphragm ring 16 sleeved in the middle of the main barrel, the diaphragm ring is radially screwed with a diaphragm guide nail 31 penetrating through the main barrel and extending into the rear group barrel, the diaphragm guide nail is connected with the diaphragm, the diaphragm adjusting ring is further provided with a diaphragm fastening screw 32 matched with the main barrel for locking the diaphragm ring, so that the requirement of adjusting the size of the diaphragm under different detection environments can be met to ensure the shooting brightness; in order to improve the stability of the lens, the diaphragm adjusting mechanism adopts an integrated manual diaphragm and is locked and attached in the inner wall of the rear end of the front main barrel through two first conical end screws 7; in order to avoid the limit use of the diaphragm angle, a diaphragm limiting groove 25 is further designed on the main cylinder to limit the diaphragm angle.
In the embodiment of the present invention, the focusing mechanism includes a focusing cam 9 disposed on the main barrel, the rear end of the inner ring of the focusing cam is in threaded connection with the outer ring of the front end of the main barrel, the rear end of the outer ring of the focusing cam is in threaded connection with the inner ring of the front end of the main barrel housing, the focusing cam is further fixed with a focusing ring 1, and the main barrel is radially screwed with a focusing fastening screw 29 for locking the focusing cam; the focusing mechanism adopts a structural design scheme of 'spiral chute + sliding bolt'; meanwhile, in order to ensure that the lens does not axially move along the optical axis in the focusing process, a double-U straight guide groove limiting slide block mechanism is designed; the specific embodiment is as follows: the periphery of the focusing cam adopts three spiral chutes 23 which are uniformly distributed in 360 degrees, and the spiral chutes are designed to be anticlockwise spirally; in order to make the front and rear group cylinders perform linear focusing in a linkage manner, three double-U straight guide grooves 24 matched with the spiral chutes are designed on the periphery of the main cylinder, then the front group cylinder is locked and limited in the three spiral chutes and the three double-U straight guide grooves of the focusing cam through three bolts 6, the focusing ring is sleeved on the periphery of the focusing cam and is locked and fixed through three second cone end screws 18, and finally the focusing cam is driven to perform circular motion by adjusting the focusing ring, so that the front and rear group cylinders are driven to perform linear focusing in a linkage manner.
In the embodiment of the present invention, through careful design, the optical glass material of eight sheets and six groups of the system is reasonably selected and matched, and the refractive index and dispersion difference between the cemented lens are utilized, so as to effectively correct the aberration, so that the MTF value of the lens is greater than or equal to 0.75 at the center 150lp/mm, and greater than or equal to 0.35 at the edge 150lp/mm (as shown in fig. 3), and the resolution of the lens is better than 2000 ten thousand pixels.
The optical path is elaborately designed, has the characteristics of large light transmission, low distortion and the like, and the focusing method adopts a half-group translation focusing method, so that high-definition imaging of the lens shot at a short distance is ensured, and the distortion is less than 0.4% (as shown in figure 4).
In an embodiment of the present invention, the parameters of each lens are as follows:
the utility model discloses the technical indicator who realizes as follows:
① image plane size 1.1 "
② Focus f ″ =35mm
③ relative aperture F2.0-F16
④ distortion is less than or equal to 0.4 percent
⑤ resolution better than 2000 ten thousand pixels
⑥ total length of light path is less than or equal to 74.86 +/-0.1 mm
⑦ applicable spectral line range of 400 nm-700 nm
⑧ external dimension phi 42.0mm × 74.7.7 mm
The utility model discloses not be limited to above-mentioned best mode, anyone is in the utility model discloses an it all can derive the low distortion machine vision camera lens of big logical light 35mm focus high definition of other various forms under the enlightenment. All the equivalent changes and modifications made according to the claims of the present invention shall fall within the scope of the present invention.
Claims (9)
1. The utility model provides a low distortion machine vision camera lens of big light-passing 35mm focus high definition which characterized in that: the lens structure comprises a front group of lenses, a diaphragm and a rear group of lenses which are arranged in the lens structure in sequence along the incident direction of light; the front group of lenses sequentially consists of a negative meniscus lens, a first positive meniscus lens, a first biconvex lens and a first biconcave lens which are tightly connected, and the rear group of lenses sequentially comprises from front to back: a second bonding group formed by the close connection of the second biconcave lens and the second biconvex lens, a third biconvex lens and a second positive meniscus lens.
2. The large-pass 35mm focal length high-definition low-distortion machine vision lens as claimed in claim 1, characterized in that: the air space between the negative meniscus lens and the first positive meniscus lens is 12.07mm, and the air space between the first positive meniscus lens and the first adhesive assembly is 3.62 mm.
3. The large-pass 35mm focal length high-definition low-distortion machine vision lens as claimed in claim 1, characterized in that: the air space between the front group of lenses and the rear group of lenses is 10.19mm, the air space between the front group of lenses and the diaphragm is 1.34mm, and the air space between the diaphragm and the rear group of lenses is 8.85 mm.
4. The large-pass 35mm focal length high-definition low-distortion machine vision lens as claimed in claim 1, characterized in that: the air space between the second gluing group and the third biconvex lens is 0.1mm, and the air space between the third biconvex lens and the second positive meniscus lens is as follows: 0.94 mm.
5. The large-pass 35mm focal length high-definition low-distortion machine vision lens as claimed in claim 1, characterized in that: the lens structure comprises a front group barrel for mounting a front group lens, the rear side of the front group barrel is connected with a main barrel, a rear group barrel for mounting a rear group lens is arranged in the main barrel, the rear group barrel is matched with the front group barrel through 3 first countersunk head screws and is fastened in a threaded manner, and a diaphragm adjusting mechanism is arranged on the main barrel; and the main cylinder is also provided with a focusing mechanism.
6. The large-pass 35mm focal length high-definition low-distortion machine vision lens as claimed in claim 5, wherein: the negative meniscus lens, the first positive meniscus lens, the first biconvex lens and the first biconcave lens are sequentially arranged in the front group cylinder from front to back; a first space ring is arranged between the negative meniscus lens and the first positive meniscus lens, a second space ring is arranged between the first positive meniscus lens and the first gluing group, and a front pressing ring pressed on the front side of the negative meniscus lens is screwed in the front group cylinder.
7. The large-pass 35mm focal length high-definition low-distortion machine vision lens as claimed in claim 6, wherein: the second biconcave lens, the second biconvex lens and the third biconvex lens are sequentially arranged in the rear group cylinder from front to back, a third space ring is arranged between the second gluing group and the third biconvex lens, a middle pressure ring is arranged outside the third biconvex lens and matched with the rear group cylinder, a connecting flange is sleeved outside the rear end of the main cylinder, and the connecting flange is connected with the rear pressure ring through threads and assembled with the second positive meniscus lens.
8. The large-pass 35mm focal length high-definition low-distortion machine vision lens as claimed in claim 5, wherein: the diaphragm adjusting mechanism comprises a diaphragm ring which is sleeved at the middle part of the main barrel, the diaphragm ring is radially screwed with a diaphragm guide nail which penetrates through the main barrel and extends into the rear group barrel, the diaphragm guide nail is connected with the diaphragm, and a diaphragm fastening screw which is matched with the main barrel and used for locking the diaphragm ring is further arranged on the diaphragm adjusting ring.
9. The large-pass 35mm focal length high-definition low-distortion machine vision lens as claimed in claim 5, wherein: the focusing mechanism comprises a focusing cam arranged on a main barrel, the rear end of an inner ring of the focusing cam is in threaded connection with an outer ring of the front end of the main barrel, the rear end of an outer ring of the focusing cam is in threaded connection with an inner ring of the front end of an outer cover of the main barrel, a focusing ring is further fixed on the focusing cam, and a focusing fastening screw for locking the focusing cam is radially screwed on the main barrel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922017881.9U CN211206931U (en) | 2019-11-21 | 2019-11-21 | Big low distortion machine vision camera lens of 35mm focus of light that leads to high definition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922017881.9U CN211206931U (en) | 2019-11-21 | 2019-11-21 | Big low distortion machine vision camera lens of 35mm focus of light that leads to high definition |
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| Publication Number | Publication Date |
|---|---|
| CN211206931U true CN211206931U (en) | 2020-08-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922017881.9U Active CN211206931U (en) | 2019-11-21 | 2019-11-21 | Big low distortion machine vision camera lens of 35mm focus of light that leads to high definition |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211206931U (en) |
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2019
- 2019-11-21 CN CN201922017881.9U patent/CN211206931U/en active Active
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