CN110895366B - 0.5-Time 110mm object distance high-resolution industrial double telecentric lens - Google Patents
0.5-Time 110mm object distance high-resolution industrial double telecentric lens Download PDFInfo
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- CN110895366B CN110895366B CN201911152822.0A CN201911152822A CN110895366B CN 110895366 B CN110895366 B CN 110895366B CN 201911152822 A CN201911152822 A CN 201911152822A CN 110895366 B CN110895366 B CN 110895366B
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- 238000004026 adhesive bonding Methods 0.000 claims abstract description 5
- 125000005647 linker group Chemical group 0.000 claims abstract description 5
- 230000002093 peripheral effect Effects 0.000 claims description 9
- 230000008033 biological extinction Effects 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 5
- 125000006850 spacer group Chemical group 0.000 claims description 5
- 238000001514 detection method Methods 0.000 description 8
- 230000003287 optical effect Effects 0.000 description 5
- 238000003384 imaging method Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 210000001503 joint Anatomy 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000005304 optical glass Substances 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
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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
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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- 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
- G02B7/022—Mountings, adjusting means, or light-tight connections, for optical elements for lenses lens and mount having complementary engagement means, e.g. screw/thread
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- Optics & Photonics (AREA)
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Abstract
The invention relates to a 0.5-time 110mm object distance high-resolution industrial double telecentric lens, which comprises a main lens barrel, wherein a front group of lenses, a diaphragm and a rear group of lenses are sequentially arranged in the main lens barrel from front to back along the light incidence direction, and the front group of lenses sequentially comprises a first biconvex lens, a first positive crescent lens, a biconcave lens and a first bonding group closely connected with a second positive crescent lens; the rear lens group is a second gluing group which is formed by closely connecting a third positive crescent lens, a fourth positive crescent lens, a second biconvex lens and a negative crescent lens in sequence. The resolution of the lens is higher than 500 ten thousand, the distortion is lower than 0.006%, and 110mm near-distance can be realized.
Description
Technical Field
The invention relates to a 0.5-time 110mm object distance high-resolution industrial double telecentric lens.
Background
With the continuous development of the industrial detection field, the common industrial lens has the advantages of constant magnification, no change along with the change of depth of field, no parallax, light and compact structural appearance and the like because of factors such as variable magnification focusing, parallax, high distortion, large structural appearance and the like, and the telecentric lens has the advantages of constant magnification, no change along with the change of depth of field, light and compact structural appearance, so that more and more industrial detection fields rely on the industrial telecentric lens to replace the common industrial lens for visual detection: such as precision parts measurement, plastic parts measurement, electronic components measurement, glass products and medical parts measurement, etc.
Disclosure of Invention
The invention aims to provide an industrial detection double telecentric lens which has resolution higher than 500 ten thousand and distortion lower than 0.006% and can realize near-distance 110mm for the field of industrial detection.
The technical scheme of the invention is as follows: the industrial double telecentric lens with the object distance of 0.5 times and 110mm comprises a main lens barrel, wherein a front group of lenses, a diaphragm and a rear group of lenses are sequentially arranged in the main lens barrel from front to back along the light incidence direction, and the front group of lenses are sequentially a first bonding group formed by closely connecting a first biconvex lens, a first orthodontics lens, a biconcave lens and a second orthodontics lens; the rear lens group is a second gluing group which is formed by closely connecting a third positive crescent lens, a fourth positive crescent lens, a second biconvex lens and a negative crescent lens in sequence.
Further, the air space between the first biconvex lens and the first orthodontics lens is 10mm; the air space between the first orthodontic tooth lens 5 and the first glue group is 0.64mm.
Further, the air space between the front set of lenses and the rear set of lenses is 28.29mm; the air interval between the front group of lenses and the diaphragm 9 is 28.15mm; the air gap between the diaphragm 9 and the rear lens is 0.14mm.
Further, the air space between the third and fourth orthodontic lenses 10 and 12 is 12.41mm; the air space between the fourth orthodontic tooth lens 12 and the second glue group is 5.16mm.
Further, the main barrel includes a front barrel for mounting the first biconvex lens 2, the first orthodontics lens 5, the first cemented group, the third orthodontics lens 10 and the fourth orthodontics lens 12, a rear end of the front barrel is connected with a rear barrel for mounting the second cemented group, and a rear end of the rear barrel is provided with a screw interface.
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-shaped lens, the middle part of the front cavity is provided with a bearing surface used for abutting against the rear peripheral part of the second crescent-shaped lens, and the rear side wall of the front cavity is provided with extinction threads; the diaphragm is arranged at the front end of the rear cavity and positioned at the front side of the third orthodontics lens, a middle spacer ring positioned between the third orthodontics lens and the fourth orthodontics lens is arranged in the rear cavity, and a middle pressing ring used for locking the fourth orthodontics lens is screwed at the rear end of the rear cavity.
Further, a bearing surface for abutting against the peripheral part of the front side surface of the second biconvex lens is arranged in the rear lens barrel, and a rear pressing ring for pressing the peripheral part of the rear side of the negative crescent lens is screwed at the rear part of the rear lens barrel.
Compared with the prior art, the invention has the following advantages: the double telecentric lens has a simple structure and a small volume, can meet the industrial detection fields of precision parts, plastic parts, electronic components, glass products, medical parts and the like, and provides a visual detection scheme with a more compact structure and a smaller volume for industrial detection.
The mechanical structure of the lens adopts a two-section butt joint forming structure, the optical system reasonably distributes the focal power of the front and rear groups of lenses by carefully selecting the front and rear groups of eight optical glass materials, the focal power of the system is further optimized, and the spherical aberration and chromatic aberration of the system are well corrected. Thus, when the object distance is 110mm, the MTF of the lens is more than or equal to 0.4 (as shown in figure 4) at 80lp/mm, so that the resolution is up to 500 ten thousand pixels and the optical distortion is less than 0.006%.
The mechanical structure of the lens adopts a two-section butt joint forming structure to effectively realize the coaxiality of the axes of the front group and the rear group of lenses; in order to improve the space structure inside the lens, the diaphragm is arranged to be a built-in fixed diaphragm structure, so that the consistency of the diaphragm of the lens is improved, and the optical performance of the lens is further ensured; in order to reduce the influence of stray light and ghost images on the imaging quality of the lens, the two spacer rings are designed to be supported by a step-shaped structure, so that not only are the entering and reflection of invalid light effectively reduced, but also the stability of the lens matched with the lens is improved; in order to further eliminate stray light and ghost images, an extinction thread structure is designed on the inner wall of the lens barrel, so that the reflection of invalid light is further blocked, and the imaging quality of the lens is effectively ensured; in order to ensure the stability of the fit between the inner wall of the lens cone and each lens, besides designing two spacer rings, three pressing rings are also designed, and the function is mainly that: after the lens is matched with the space ring, the space ring finally fixes and locks the lens, so that the stability and reliability of the lens are ensured.
Drawings
FIG. 1 is a block diagram of an optical path 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. a front pressing ring 2, a first biconvex lens 3, a front spacing ring 4, a front lens barrel 5, a first positive crescent lens 6, a biconcave lens 7, a second positive crescent lens 8, a extinction thread 9, a diaphragm 10, a third positive crescent lens 11, a middle spacing ring 12, a fourth positive crescent lens 13, a middle pressing ring 14, a second biconvex lens 15, a negative crescent lens 16, a rear lens barrel 17, a rear pressing ring 18, a threaded interface 19 and an image plane.
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 0.5 times and 110mm comprises a main lens barrel, wherein a front group of lenses A, a diaphragm 9 and a rear group of lenses B are sequentially arranged in the main lens barrel from front to back along the light incidence direction, and the front group of lenses are sequentially a first bonding group formed by closely connecting a first biconvex lens 2, a first orthodontics lens 5, a biconcave lens 6 and a second orthodontics lens 7; the rear group lens is a second bonding group formed by closely connecting a third positive crescent-shaped lens 10, a fourth positive crescent-shaped lens 12, a second biconvex lens 14 and a negative crescent-shaped lens 15 in sequence.
In this embodiment, the air space between the first biconvex lens and the first orthodontics lens is 10mm; the air space between the first orthodontic tooth lens and the first glue group is 0.64mm.
In this embodiment, the air gap between the front set of lenses and the rear set of lenses is 28.29mm; the air interval between the front group of lenses and the diaphragm is 28.15mm; the air gap between the diaphragm and the rear group of lenses is 0.14mm.
In this embodiment, the air space between the third and fourth orthodontic lenses is 12.41mm; the air space between the fourth orthodontic tooth lens and the second glue set is 5.16mm.
In this embodiment, the main lens barrel includes a front lens barrel 4 for mounting the first biconvex lens 2, the first orthodontics lens 5, the first cemented group, the third orthodontics lens 10 and the fourth orthodontics lens 12, a rear end of the front lens barrel is connected with a rear lens barrel 16 for mounting the second cemented group, and a rear end of the rear lens barrel is provided with a screw interface 18, i.e., a C interface.
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, the middle part of the front chamber is provided with a bearing surface for abutting against the rear side peripheral part of the second crescent-shaped lens, and the rear side wall of the front chamber is provided with a extinction thread 8; the diaphragm is arranged at the front end of the rear cavity and positioned at the front side of the third orthodontics lens, a middle diaphragm ring 11 positioned between the third orthodontics lens and the fourth orthodontics lens is arranged in the rear cavity, and a middle diaphragm ring 13 used for locking the fourth orthodontics lens is screwed at the rear end of the rear cavity.
In this embodiment, the front lens barrel is integrally designed and formed by one-step machining by a lathe, so that the coaxiality of the bearing surfaces of the lenses of the front lens barrel is ensured.
In order to reduce the influence of stray light and ghost light on the imaging quality of the lens, the front space ring and the middle space ring are designed to be in a step-shaped structure, and the position where the front space ring and the middle space ring are matched with the lens is designed to be in right-angle bearing, so that the air interval between the first biconvex lens 2 and the first ortholunar lens 5, the air interval between the first ortholunar lens 10 and the air interval between the first ortholunar lens are effectively ensured, and the air interval between the first ortholunar lens and the first ortholunar lens are effectively ensured, and the air interval between the first ortholunar lens and the air interval between the first and the first ortholunar lens 10 and the air interval between the first and the first ortholunar lens 12 and the air space lens 12 are effectively reduced.
In order to further eliminate stray light and ghost images, an extinction thread structure is further designed on the inner wall of the front lens barrel, so that the reflection of invalid light is further blocked, and the imaging quality of the lens is effectively ensured; the front pressing ring and the middle pressing ring are matched with the front lens barrel, so that the final fixing and locking effects of the lens and the spacer ring are mainly achieved, and the stability and reliability of the lens are guaranteed.
In this embodiment, a bearing surface for abutting against the peripheral part of the front side surface of the second biconvex lens is provided in the rear barrel, and a rear pressing ring 17 for pressing against the peripheral part of the rear side of the negative crescent lens is screwed to the rear part of the rear barrel.
In the embodiment, the rear lens barrel is also integrally designed and is formed by one-step machining by a lathe, so that the coaxiality of the front lens barrel, the rear lens barrel and the bearing surfaces of the lenses is ensured. In order to ensure the stability of the second gluing group, the rear pressing ring is designed to be matched with the rear lens barrel, and the lens of the rear pressing ring is fixed, so that the movement of the lens is reduced, and the stability of the lens assembly is improved; and the rear lens cone is in two-section threaded butt joint with the front lens cone through threads, so that coaxiality of the axes of the lenses of the front group and the rear group is effectively realized. Besides, the tail part of the rear lens barrel also adopts a C interface design which is the main stream in the market at present, and can be matched with most industrial cameras in the market at first, so that the practicability is greatly improved.
In this embodiment, the parameters of each lens are shown in the following table:
。
the technical indexes that this lens can realize are as follows:
① Image plane size: 2/3';
② Magnification ratio: 0.5X;
③ Working object distance: 110mm;
④ Effective aperture: f9.6;
⑤ Optical distortion: less than or equal to 0.006%;
⑥ Resolution ratio: more than or equal to 500 ten thousand pixels;
⑦ Depth of field: 3.02mm;
⑧ Operating temperature: -20-60 ℃;
⑨ Lens size specification: phi 34mm x 106mm.
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 a 0.5 x 110mm object distance high resolution industrial double telecentric lens of various forms can be devised without the need for inventive labor, without departing from the spirit and scope of the invention.
Claims (4)
1. The industrial double telecentric lens with the object distance of 0.5 times and 110mm comprises a main lens barrel, and is characterized in that a front group of lenses, a diaphragm and a rear group of lenses are sequentially arranged in the main lens barrel from front to back along the light incidence direction, and the front group of lenses sequentially comprises a first biconvex lens, a first orthodontics lens, a biconcave lens and a first bonding group closely connected with a second orthodontics lens; the rear lens group is a second gluing group which is formed by closely connecting a third positive crescent lens, a fourth positive crescent lens, a second biconvex lens and a negative crescent lens in sequence; the air interval between the first biconvex lens and the first orthodontics lens is 10mm; the air space between the first orthodontic tooth lens and the first gluing group is 0.64mm; the air space between the front group of lenses and the rear group of lenses is 28.29mm; the air interval between the front group of lenses and the diaphragm is 28.15mm; the air interval between the diaphragm and the rear group lens is 0.14mm; the air space between the third and fourth crescent-shaped lenses is 12.41mm; the air space between the fourth orthodontic tooth lens and the second glue group is 5.16mm; the curvature radius of the left side surface of the first biconvex lens is 52.26mm, the curvature radius of the right side surface is-260.02 mm, and the thickness is 6.42mm; the curvature radius of the left side surface of the first orthodontics lens is 38.72mm, the curvature radius of the right side surface is 177.7 mm, and the thickness is 7.0mm; the curvature radius of the left side surface of the biconcave lens is-188.56 mm, the curvature radius of the right side surface of the biconcave lens is 20.21mm, and the thickness of the biconcave lens is 3.85mm; the curvature radius of the left side surface of the second orthodontics lens is 20.21mm, the curvature radius of the right side surface is 255.98mm, and the thickness is 7.0mm; the curvature radius of the left side surface of the third orthodontics lens is 10.17mm, the curvature radius of the right side surface is 6.0mm, and the thickness is 4.0mm; the curvature radius of the left side surface of the fourth orthodontics lens is-18.35 mm, the curvature radius of the right side surface is-10.92 mm, and the thickness is 5.0mm; the curvature radius of the left side surface of the second biconvex lens is 43.25mm, the curvature radius of the right side surface is-16.21 mm, and the thickness is 4.62mm; the curvature radius of the left side surface of the negative crescent lens is-16.21 mm, the curvature radius of the right side surface is-120.0 mm, and the thickness is 1.53mm.
2. The 0.5-fold 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 third orthodontics lens and a fourth orthodontics lens, a rear end of said front lens barrel is connected with a rear lens barrel for mounting a second cemented group, and a rear end of said rear lens barrel is provided with a screw interface.
3. The industrial double telecentric lens with the object distance of 0.5 times 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, a front pressing ring for locking the first biconvex lens is screwed at the front end of the front chamber, a front spacing ring is arranged between the first biconvex lens and the first orthodontics lens, a bearing surface for abutting against the rear peripheral part of the second orthodontics lens is arranged in the middle of the front chamber, and extinction threads are arranged on the rear side wall of the front chamber; the diaphragm is arranged at the front end of the rear cavity and positioned at the front side of the third orthodontics lens, a middle spacer ring positioned between the third orthodontics lens and the fourth orthodontics lens is arranged in the rear cavity, and a middle pressing ring used for locking the fourth orthodontics lens is screwed at the rear end of the rear cavity.
4. A 0.5-time 110mm object distance high-resolution industrial double telecentric lens according to claim 2 or 3, wherein the rear barrel is internally provided with a bearing surface for abutting against the peripheral part of the front side surface of the second biconvex lens, and the rear part of the rear barrel is screwed with a rear pressing ring for pressing against the peripheral part of the rear side of the negative crescent lens.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911152822.0A CN110895366B (en) | 2019-11-22 | 2019-11-22 | 0.5-Time 110mm object distance high-resolution industrial double telecentric lens |
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| CN201911152822.0A CN110895366B (en) | 2019-11-22 | 2019-11-22 | 0.5-Time 110mm object distance high-resolution industrial double telecentric lens |
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| CN110895366A CN110895366A (en) | 2020-03-20 |
| CN110895366B true CN110895366B (en) | 2024-06-07 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111624746A (en) * | 2020-04-27 | 2020-09-04 | 长春理工大学 | Light low-light-level night vision lens |
| CN113433680B (en) * | 2021-07-14 | 2022-05-17 | 光虎光电科技(天津)有限公司 | Double-telecentric lens |
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| CN106291890A (en) * | 2015-05-14 | 2017-01-04 | 桂林电子科技大学 | A kind of-0.1 × doubly telecentric machine vision object lens |
| CN106443975A (en) * | 2016-12-16 | 2017-02-22 | 福建福光天瞳光学有限公司 | Optical industrial lens with high resolution and low distortion |
| 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 |
| CN109254388A (en) * | 2018-11-21 | 2019-01-22 | 福建福光股份有限公司 | Telecentric optics are examined as system and imaging method |
| WO2019062941A1 (en) * | 2017-09-29 | 2019-04-04 | 上海微电子装备（集团）股份有限公司 | Projection objective |
| CN211454084U (en) * | 2019-11-22 | 2020-09-08 | 福建福光天瞳光学有限公司 | High-resolution double-telecentric optical system with 0.5-time 110mm object distance and lens |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3708845B2 (en) * | 2001-06-19 | 2005-10-19 | 株式会社ミツトヨ | Both telecentric objective lenses |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106291890A (en) * | 2015-05-14 | 2017-01-04 | 桂林电子科技大学 | A kind of-0.1 × doubly telecentric machine vision object lens |
| CN106443975A (en) * | 2016-12-16 | 2017-02-22 | 福建福光天瞳光学有限公司 | Optical industrial lens with high resolution and low distortion |
| WO2019062941A1 (en) * | 2017-09-29 | 2019-04-04 | 上海微电子装备（集团）股份有限公司 | Projection objective |
| 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 |
| CN109254388A (en) * | 2018-11-21 | 2019-01-22 | 福建福光股份有限公司 | Telecentric optics are examined as system and imaging method |
| CN211454084U (en) * | 2019-11-22 | 2020-09-08 | 福建福光天瞳光学有限公司 | High-resolution double-telecentric optical system with 0.5-time 110mm object distance and lens |
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