CN110895367B - 1.0 times 110mm object distance high-resolution industrial double telecentric lens - Google Patents
1.0 times 110mm object distance high-resolution industrial double telecentric lens Download PDFInfo
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- CN110895367B CN110895367B CN201911153013.1A CN201911153013A CN110895367B CN 110895367 B CN110895367 B CN 110895367B CN 201911153013 A CN201911153013 A CN 201911153013A CN 110895367 B CN110895367 B CN 110895367B
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- 238000004026 adhesive bonding Methods 0.000 claims abstract description 8
- 125000005647 linker group Chemical group 0.000 claims abstract description 5
- 230000008033 biological extinction Effects 0.000 claims description 20
- 125000006850 spacer group Chemical group 0.000 claims description 8
- 239000003292 glue Substances 0.000 claims description 7
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims 3
- 238000001514 detection method Methods 0.000 abstract description 5
- 230000010354 integration Effects 0.000 abstract description 2
- 230000003287 optical effect Effects 0.000 description 9
- 238000003384 imaging method Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 3
- 210000001503 joint Anatomy 0.000 description 2
- 230000004304 visual acuity Effects 0.000 description 2
- 238000004159 blood analysis Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000001259 photo etching Methods 0.000 description 1
- 210000001747 pupil Anatomy 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/22—Telecentric objectives or lens systems
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0018—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 with means for preventing ghost images
-
- 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
- G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
-
- 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
- G02B7/026—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using retaining rings or springs
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Lenses (AREA)
Abstract
The invention relates to a 1.0-time 110mm object distance high-resolution industrial double telecentric lens, which comprises a main lens barrel, wherein a front group of lenses, a fixed diaphragm and a rear group of lenses are respectively arranged in the main lens barrel from front to back along the incident direction of light rays; the front lens group is a first bonding group formed by closely connecting a first biconvex lens, a first orthodontics lens, a first biconcave lens and a second orthodontics lens in sequence; the rear lens group is a second gluing group which is formed by closely connecting a second biconcave lens, a second biconvex lens, a third orthodontics lens and a fourth orthodontics lens in sequence. The lens has good integration, can be suitable for various detection industries, and has the advantages of ultralow distortion, high depth of field, low parallax and the like.
Description
Technical Field
The invention relates to a 1.0-time 110mm object distance high-resolution industrial double telecentric lens.
Background
Along with the expansion of industrial detection industry, although there are many kinds of telecentric lenses on the market, the testing effect still cannot meet all market demands, and the problems of large imaging edge distortion, insufficient depth of field, parallax, large structural volume and the like exist. For this reason, it is significant to require a compact, ultra-low distortion, high depth of field, low parallax to complement the market demand.
Disclosure of Invention
The invention aims to provide a 1.0-time 110mm object distance high-resolution industrial double telecentric lens, which has good integration, can be suitable for various detection industries, and has the advantages of ultralow distortion, high depth of field, low parallax and the like.
The technical scheme of the invention is as follows: the industrial double telecentric lens with the object distance of 110mm and high resolution ratio is 1.0 time and comprises a main lens barrel, wherein a front group of lenses, a fixed diaphragm and a rear group of lenses are respectively arranged in the main lens barrel from front to back along the incident direction of light rays; the front lens group is a first bonding group formed by closely connecting a first biconvex lens, a first orthodontics lens, a first biconcave lens and a second orthodontics lens in sequence; the rear lens group is a second gluing group which is formed by closely connecting a second biconcave lens, a second biconvex lens, a third orthodontics lens and a fourth orthodontics lens in sequence.
Further, the air space between the first biconvex lens and the first orthodontics lens is 0.99mm; the air space between the first orthodontic tooth lens and the first glue group is 1.13mm.
Further, the air space between the front set of lenses and the rear set of lenses is 27.73mm; the air interval between the front group of lenses and the fixed diaphragm is 24.51mm; the air space between the fixed diaphragm and the rear lens is 3.22mm.
Further, the air space between the second biconcave lens and the second biconvex lens is 11.16mm; the air space between the second biconvex lens and the second glue group is 29.57mm.
Further, the main lens barrel comprises a front lens barrel for mounting the first biconvex lens, the first orthodontics lens, the first gluing group, the second biconcave lens and the second biconvex lens, the rear end of the front lens barrel is connected with a rear lens barrel for mounting the second gluing group, and the rear end of the rear lens barrel is connected with a CCD flange.
Further, the front lens barrel is provided with a front cavity and a rear cavity which are communicated, the front end of the front cavity is in threaded connection with a front pressing ring used for locking the first biconvex lens, a front spacing ring is arranged between the first biconvex lens and the first crescent lens, a bearing surface used for abutting against the rear periphery of the second crescent lens is arranged in the front cavity, a extinction step is arranged at the rear side of the bearing surface in the front cavity, extinction threads are arranged at the rear side of the extinction step in the front cavity, and the fixed diaphragm is arranged at the rear end of the front cavity; and a middle pressing ring used for locking the second biconvex lens is screwed at the rear end of the rear cavity.
Further, the front part of the mounting cavity of the rear lens barrel is provided with a extinction thread, the middle part of the mounting cavity of the rear lens barrel is provided with a bearing surface for abutting against the periphery of the front side surface of the third crescent lens, and the rear end of the mounting cavity of the rear lens barrel is in threaded connection with a rear pressing ring for pressing the periphery of the rear side surface of the fourth crescent lens.
Further, the front lens cone and the rear lens cone are connected through threads, the front part of the CCD flange is sleeved at the rear end of the rear lens cone and is fixedly connected with the rear lens cone through a set screw arranged on the circumferential surface in the radial direction, and the rear end of the CCD flange is provided with C-interface threads.
Further, the inner rings of the front spacing ring and the middle spacing ring are of step-shaped bearing structures.
Compared with the prior art, the invention has the following advantages: the lens has the advantages of small volume, ultra-low distortion, high depth of field, low parallax and the like, can meet the industrial detection industries of particle measurement, color measurement, photoetching mask layer measurement, filter control, blood analysis, cell metering and the like, and provides a structure appearance with small structure and lighter volume for a visual detection system.
The optical system of the lens is designed with eight lenses, and eight spherical lens materials of the front group and the rear group are reasonably matched, so that the control of parallel light is realized; the corresponding pupil is in an infinity state by reasonably controlling the principal rays of the object side and the image side, thereby achieving the parallax elimination function. And when the object distance is 110mm, the MTF of the lens is more than or equal to 0.4 (shown in figure 3) at 80lp/mm, so that the resolution is more than or equal to 500 ten thousand pixels and the optical distortion is less than or equal to 0.001% (shown in figure 4).
The mechanical structure of the lens adopts a three-section butt joint forming structure, wherein the front lens barrel and the rear lens barrel are in threaded connection through threads; the rear lens barrel is in butt joint with the CCD flange through the set screw, so that coaxiality of each lens is effectively realized. In order to ensure the consistency of the aperture values of the lenses, the diaphragm structure is designed to be a fixed diaphragm, so that the stability of the lenses is improved, and the optical performance of the lenses is further ensured. In order to improve the resolving power of the lens, extinction steps, extinction threads and extinction threads are designed in the front lens barrel and the rear lens barrel, so that the influence of stray light and ghost images on the optical performance is effectively reduced, and the imaging quality of the lens is ensured. In order to further reduce stray light and ghosting, the front spacing ring and the middle spacing ring are designed to be of a step-shaped bearing structure, so that incidence and reflection of the stray light are reduced, and the right angle design of the spacing ring and the lens are matched and bear, so that the stability of lens assembly is further enhanced. Meanwhile, in order to ensure the stability of each lens of the front group and the rear group, besides two spacer rings, three pressing rings are designed for final fixing and locking of lens assembly, so that the stability and consistency of the optical performance of the lens are ensured.
Drawings
FIG. 1 is a block diagram of an optical system of the present invention;
FIG. 2 is a schematic view of a lens structure according to the present invention;
FIG. 3 is a graph of MTF for the present invention;
FIG. 4 is a graph of distortion variation of the present invention;
in the figure: 1. front ferrule 2, first biconvex lens 3, front spacer 4, first biconcave lens 6, first biconcave lens 7, extinction step 8, front barrel 9, extinction thread 10, fixed stop 11, second biconcave lens 12, spacer 13, second biconvex lens 14, intermediate ferrule 15, extinction thread 16, rear barrel 17, third biconcave lens 18, fourth biconcave lens 19, rear ferrule 20, set screw 21, CCD flange 22, C interface thread 23, imaging surface.
Detailed Description
In order to make the above features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below, but the present invention is not limited thereto.
Referring to fig. 1 to 4
The industrial double telecentric lens with the object distance of 110mm and high resolution ratio is 1.0 time and comprises a main lens barrel, wherein a front group of lenses, a fixed diaphragm 10 and a rear group of lenses are respectively arranged in the main lens barrel from front to back along the incident direction of light rays; the front lens group is a first bonding group formed by closely connecting a first biconvex lens 2, a first orthodontics lens 4, a first biconcave lens 5 and a second orthodontics lens 6 in sequence; the rear group lens is a second bonding group formed by closely connecting a second biconcave lens 11, a second biconvex lens 13, a third orthodontics lens 17 and a fourth orthodontics lens 18 in sequence.
In this embodiment, the air space between the first biconvex lens and the first orthodontics lens is 0.99mm; the air space between the first orthodontic tooth lens and the first glue group is 1.13mm.
In this embodiment, the air gap between the front set of lenses and the rear set of lenses is 27.73mm; the air interval between the front group of lenses and the fixed diaphragm is 24.51mm; the air space between the fixed diaphragm and the rear lens is 3.22mm.
In this embodiment, the air space between the second biconcave lens and the second biconvex lens is 11.16mm; the air space between the second biconvex lens and the second glue group is 29.57mm.
In this embodiment, the main lens barrel includes a front lens barrel 8 for mounting a first biconvex lens, a first orthodontics lens, a first glue group, a second biconcave lens and a second biconvex lens, a rear end of the front lens barrel is connected with a rear lens barrel 16 for mounting a second glue group, and a rear end of the rear lens barrel is connected with a CCD flange 21.
In this embodiment, the front lens barrel is provided with a front chamber and a rear chamber which are communicated, the front end of the front chamber is in threaded connection with a front pressing ring 1 for locking the first biconvex lens, a front spacing ring 3 is arranged between the first biconvex lens and the first crescent-shaped lens, a bearing surface for abutting against the rear periphery of the second crescent-shaped lens is arranged in the front chamber, an extinction step 7 is arranged in the front chamber and positioned at the rear side of the bearing surface, an extinction thread 9 is arranged in the front chamber and positioned at the rear side of the extinction step, and the fixed diaphragm is fixedly arranged at the rear end of the front chamber; a middle spacer 12 positioned between the second biconcave lens and the second biconvex lens is arranged in the rear chamber, and a middle pressing ring 14 used for locking the second biconvex lens is screwed at the rear end of the rear chamber.
In the embodiment, the front lens barrel is integrally formed, so that the concentricity of the assembly of six lenses in the front lens barrel is ensured. In order to improve the resolving power of the lens, an extinction step 7 and an extinction thread 9 are designed in the front lens barrel, so that the influence of stray light and ghost images on the optical performance is effectively reduced, and the imaging quality of the lens is ensured.
In this embodiment, in order to further reduce stray light and ghosting, the inner rings of the front spacer ring and the middle spacer ring are designed to be in a step-shaped bearing structure, so that incidence and reflection of stray light are reduced, and the right-angle design of the spacer ring and the lens are matched and supported, so that stability of lens assembly is further enhanced. The front pressing ring and the middle pressing ring are matched with the front lens cone and are used for finally fixing and locking six lenses in the front lens cone, so that the stability and consistency of the optical performance of the lens are ensured.
In this embodiment, the front portion of the mounting chamber of the rear barrel is provided with a extinction thread 15, the middle portion of the mounting chamber of the rear barrel is provided with a bearing surface for abutting against the peripheral portion of the front side surface of the third orthodontic tooth-shaped lens, and the rear end of the mounting chamber of the rear barrel is screwed with a rear pressing ring 19 for pressing against the peripheral portion of the rear side surface of the fourth orthodontic tooth-shaped lens.
In this embodiment, the rear barrel is integrally formed, so that the concentricity of the rear barrel and the assembly of the two lenses is ensured. In order to ensure the stability of the second gluing group of the rear group, the rear pressing ring is matched with the rear lens barrel for final fixing of the second gluing group, so that the stability of lens assembly is improved. The rear lens barrel is also provided with internal threads which are threaded with external threads of the front lens barrel, so that the concentricity of the axes of the front lens and the rear lens is ensured.
In this embodiment, coaxiality of the axes of the front lens barrel and the rear lens barrel is achieved, and the front lens barrel and the rear lens barrel are connected through threads. In order to realize the connection between the lens barrel and the camera, a CCD flange is designed. The front part of the CCD flange is sleeved at the rear end of the rear lens barrel and is fixedly connected with the rear lens barrel through three set screws 20 radially arranged on the circumferential surface, so that the lens imaging system is better than 500 ten thousand high-resolution pixels. The rear end of CCD flange is provided with C interface screw thread 22, has satisfied the use of most industrial cameras on the market, has promoted the practicality.
In this embodiment, the parameters of each lens are shown in the following table:
。
the technical indexes achieved by the invention are as follows:
(1) image plane size: 2/3';
(2) magnification ratio: 1.0X;
(3) working object distance: 110mm;
(4) effective aperture: f10.1;
(5) optical distortion: less than or equal to 0.001%;
(6) resolution ratio: more than or equal to 500 ten thousand pixels
(7) Depth of field: 2.2mm;
(8) operating temperature: -20-60 ℃;
(9) lens size specification: phi 30mm x 121mm.
The foregoing is merely illustrative of the principles and spirit of the invention, and it will be apparent to those skilled in the art from this disclosure that the disclosed embodiments of 1.0x 110mm object distance high resolution industrial double telecentric lens can be devised without any inventive effort, without departing from the spirit and principles of the invention.
Claims (6)
1. The industrial double telecentric lens with the object distance of 110mm and high resolution ratio is characterized in that a front group of lenses, a fixed diaphragm and a rear group of lenses are respectively arranged in the main lens barrel from front to back along the incident direction of light; the front lens group is a first bonding group formed by closely connecting a first biconvex lens, a first orthodontics lens, a first biconcave lens and a second orthodontics lens in sequence; the rear group lens is a second gluing group which is formed by closely connecting a second biconcave lens, a second biconvex lens, a third orthodontics lens and a fourth orthodontics lens in sequence; the air interval between the first biconvex lens and the first orthodontics lens is 0.99mm; the air space between the first orthodontic tooth lens and the first gluing group is 1.13mm; the air space between the front group of lenses and the rear group of lenses is 27.73mm; the air interval between the front group of lenses and the fixed diaphragm is 24.51mm; the air interval between the fixed diaphragm and the rear lens is 3.22mm; the air interval between the second biconcave lens and the second biconvex lens is 11.16mm; the air space between the second biconvex lens and the second glue group is 29.57mm.
2. The 1.0x 110mm object distance high resolution industrial double telecentric lens according to claim 1, wherein said main lens barrel comprises a front lens barrel for mounting a first biconvex lens, a first orthodontics lens, a first cemented group, a second biconcave lens and a second biconvex lens, the rear end of said front lens barrel is connected with a rear lens barrel for mounting a second cemented group, and the rear end of said rear lens barrel is connected with a CCD flange.
3. The industrial double telecentric lens with the object distance of 1.0 time and 110mm and high resolution according to claim 2, wherein the front lens barrel is provided with a front chamber and a rear chamber which are communicated, the front end of the front chamber is in threaded connection with a front pressing ring used for locking the first biconvex lens, a front spacing ring is arranged between the first biconvex lens and the first positive crescent lens, a bearing surface used for abutting against the rear peripheral part of the second positive crescent lens is arranged in the front chamber, a extinction step is arranged at the rear side of the bearing surface in the front chamber, an extinction thread is arranged at the rear side of the extinction step in the front chamber, and the diaphragm is fixedly installed at the rear end of the front chamber; and a middle pressing ring used for locking the second biconvex lens is screwed at the rear end of the rear cavity.
4. A 1.0-time 110mm object distance high-resolution industrial double telecentric lens according to claim 2 or 3, wherein the front part of the installation chamber of the rear lens barrel is provided with extinction threads, the middle part of the installation chamber of the rear lens barrel is provided with a bearing surface for abutting against the periphery of the front side surface of the third front crescent lens, and the rear end of the installation chamber of the rear lens barrel is in threaded connection with a rear pressing ring for pressing on the periphery of the rear side surface of the fourth front crescent lens.
5. The industrial double telecentric lens with a high resolution of 110mm object distance, which is 1.0 times as large as the one in claim 4, is characterized in that the front lens barrel and the rear lens barrel are connected through threads, the front part of the CCD flange is sleeved at the rear end of the rear lens barrel and is fixedly connected with the rear lens barrel through a set screw arranged on the circumferential surface in the radial direction, and the rear end of the CCD flange is provided with C-interface threads.
6. A 1.0x 110mm object distance high resolution industrial double telecentric lens according to claim 3, wherein the inner rings of the front and middle spacers are stepped bearing structures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911153013.1A CN110895367B (en) | 2019-11-22 | 2019-11-22 | 1.0 times 110mm object distance high-resolution industrial double telecentric lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911153013.1A CN110895367B (en) | 2019-11-22 | 2019-11-22 | 1.0 times 110mm object distance high-resolution industrial double telecentric lens |
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| Publication Number | Publication Date |
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| CN110895367A CN110895367A (en) | 2020-03-20 |
| CN110895367B true CN110895367B (en) | 2024-03-05 |
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| CN201911153013.1A Active CN110895367B (en) | 2019-11-22 | 2019-11-22 | 1.0 times 110mm object distance high-resolution industrial double telecentric lens |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104777595A (en) * | 2015-04-26 | 2015-07-15 | 西安远心光学系统有限公司 | Bi-telecentric optical lens |
| CN106483642A (en) * | 2016-12-14 | 2017-03-08 | 舜宇光学(中山)有限公司 | A kind of doubly telecentric camera lens based on machine vision |
| CN206378633U (en) * | 2016-12-28 | 2017-08-04 | 陕西维视数字图像技术有限公司 | A kind of doubly telecentric optical lens |
| CN107884912A (en) * | 2017-12-11 | 2018-04-06 | 福建福光股份有限公司 | The fixed times double telecentric optical system of one kind |
| CN211454083U (en) * | 2019-11-22 | 2020-09-08 | 福建福光天瞳光学有限公司 | 1.0-time 110mm object distance high-resolution double telecentric optical system and lens |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102486569B (en) * | 2010-12-01 | 2014-06-18 | 上海微电子装备有限公司 | Projection lens system |
-
2019
- 2019-11-22 CN CN201911153013.1A patent/CN110895367B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104777595A (en) * | 2015-04-26 | 2015-07-15 | 西安远心光学系统有限公司 | Bi-telecentric optical lens |
| CN106483642A (en) * | 2016-12-14 | 2017-03-08 | 舜宇光学(中山)有限公司 | A kind of doubly telecentric camera lens based on machine vision |
| CN206378633U (en) * | 2016-12-28 | 2017-08-04 | 陕西维视数字图像技术有限公司 | A kind of doubly telecentric optical lens |
| CN107884912A (en) * | 2017-12-11 | 2018-04-06 | 福建福光股份有限公司 | The fixed times double telecentric optical system of one kind |
| CN211454083U (en) * | 2019-11-22 | 2020-09-08 | 福建福光天瞳光学有限公司 | 1.0-time 110mm object distance high-resolution double telecentric optical system and lens |
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