CN211603687U - High-magnification wide-working-distance line scanning lens - Google Patents
High-magnification wide-working-distance line scanning lens Download PDFInfo
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- CN211603687U CN211603687U CN202020072716.3U CN202020072716U CN211603687U CN 211603687 U CN211603687 U CN 211603687U CN 202020072716 U CN202020072716 U CN 202020072716U CN 211603687 U CN211603687 U CN 211603687U
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- 230000003287 optical effect Effects 0.000 claims abstract description 43
- 230000005499 meniscus Effects 0.000 claims description 15
- 238000003384 imaging method Methods 0.000 abstract description 7
- 230000000007 visual effect Effects 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 6
- 230000007547 defect Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011179 visual inspection Methods 0.000 description 2
- 206010063385 Intellectualisation Diseases 0.000 description 1
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- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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Abstract
The utility model belongs to the technical field of the camera lens, concretely relates to wide working distance line of high magnification sweeps camera lens, including mechanical system and install in the inside optical system of mechanical system, optical system sets gradually first battery of lens S1, diaphragm (1), second battery of lens S2 by the object space to the image space, and when working distance changed, first battery of lens S1, diaphragm (1) and second battery of lens S2 focused through the mode of back-and-forth movement. The utility model discloses a wide working distance's of high magnification industrial camera lens is swept to line, and the focus is 116mm, and magnification is 0.425X-0.575X, is suitable for working distance to be 286mm ~ 357mm, and image space F number is 4.8, and the biggest imaging surface is phi 82mm, and its resolution ratio can reach 100lp/mm, and the biggest optical distortion of full visual field is less than 0.035%.
Description
Technical Field
The utility model belongs to the technical field of the industrial lens, concretely relates to camera lens is swept to wide working distance line of high magnification.
Background
Under the promotion of industry 4.0, "automation", "intelligence" has become the trend of modern industrial production. Visual inspection systems have been widely used in various industries as important components of "automation" and "intellectualization", and thus, the demands for industrial lens applications as the core of visual inspection systems have been increasing. In the applications of electronic manufacturing, liquid crystal display defect detection, printing detection, non-woven fabric detection, mobile phone touch screen smooth surface scratch and crack detection and the like, the detection precision requirement is higher and higher, the line scanning industrial lens is required to be used for imaging, and particularly in some online real-time detection items, the detection precision is directly influenced by the performance of the line scanning lens.
However, the optical performance of the domestic existing line scanning industrial lens always has the following defects: the optical distortion is large, the working distance range is narrow, and the like, so the research and development of the line scanning industrial lens with higher optical performance are more urgent.
At present, machine vision lenses in the market, such as the patent with the patent number "201710525728. X", have the working distance of 0.2m to infinity, but cannot meet the requirement of closer working distance; as another patent with patent number "201621096764.6", the working distance of the lens is 100mm-600mm for clear imaging, but the working distance range is too narrow; as shown in patent No. 201721433005.9, the working distance of the lens is 50-160 mm, but the optical distortion is 0.05%, and the distortion degree is high.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: aiming at the defects of the prior art, the line scanning industrial lens with 100lp/mm resolution, low distortion, large target surface and good chromatic aberration correction capability is developed.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a high-power wide-working-distance line-scan lens comprises a mechanical system and an optical system arranged in the mechanical system, wherein the optical system is provided with a first lens group S1, a diaphragm and a second lens group S2 in sequence from an object side to an image side, and when the working distance is changed, the first lens group S1, the diaphragm and the second lens group S2 are focused in a front-back movement mode;
the first lens group S1 comprises a first lens G1 with positive focal power and a meniscus structure, a second lens G2 with positive focal power and a meniscus structure, a third lens G3 with positive focal power and a meniscus structure, and a fourth lens G4 with negative focal power and a meniscus structure;
the second lens group S2 includes a fifth lens G5 having negative power and a biconcave structure, a sixth lens G6 having positive power and a biconvex structure, a seventh lens G7 having positive power and a meniscus structure;
the third lens G3 is cemented with the fourth lens G4 to form a first cemented lens group U1 with negative power, and the fifth lens G5 is cemented with the sixth lens G6 to form a second cemented lens group U2 with negative power;
the focal length f of the optical system and the focal length f of the first cemented lens group U1U1Focal length f of the second cemented lens group U2U2，fU1The ratio of f to f satisfies the relation: 0.50 < | fU1/f|＜1.0；fU2The ratio of f to f satisfies the relation: 3.0 < | fU2/f|＜5.0。
As an improvement of the wide working distance line-scan lens of high magnification, first lens G1 is close to the summit of object side surface arrives seventh lens G7 is close to distance L between the summit of image side surface with optical system's focus f satisfies the relational expression: 0.40 < | L/f |.
As an improvement of the wide working distance line-scan lens of high magnification, seventh lens G7 of optical system to the distance of image plane promptly behind the optics intercept BFL with optical system's focus f satisfies the relational expression: i BFL/f I is less than 1.50.
As a wide working distance line of high magnification sweep a kind of improvement of camera lens, optical system's half image height y ' with optical system's focus f, satisfy the relational expression: the | y'/f | is less than 0.50.
As an improvement of the high-magnification wide-working-distance line-scan lens of the present invention, the refractive index of the first lens G1 is n1, 1.40 < n1 < 1.60.
As an improvement of the high-magnification wide-working-distance line-scan lens of the present invention, the refractive index of the second lens G2 is n2, 1.85 < n2 < 1.95.
As an improvement of the high-magnification wide-working-distance line-scanning lens, the focal length of the third lens is fG3The focal length of the fourth lens is fG4，fG3And fU1The ratio of (A) satisfies the relation: 1.0 < | fG3/fU1|＜1.50，fG4And fU1The ratio of (A) satisfies the relation: 0.35 < | fG4/fU1|＜0.60。
As an improvement of the high-magnification wide-working-distance line-scanning lens, the focal length of the fifth lens is fG5A focal length f of the sixth lensG6，fG5And fG6The ratio of (A) satisfies the relation: 0.55 < | fG5/fG6|＜0.90。
As an improvement of the high-magnification wide-working-distance line-scan lens of the present invention, the refractive index of the seventh lens G7 is n7, 1.85 < n7 < 1.95.
As a wide working distance line of high magnification sweep a kind of improvement of camera lens, each lens be the spherical mirror, the diaphragm aperture is the round hole, the light ring of diaphragm is adjustable at F4.8 ~ F32 within range.
The beneficial effects of the utility model reside in that: the line scanning lens with the high magnification and the wide working distance and the focal length of 116mm is realized through the structure, the focal length is 116mm, the magnification is 0.425X-0.575X, the applicable working distance is 286 mm-357 mm, the image F number is 4.8, the maximum imaging surface is phi 82mm, the resolution ratio can reach 100lp/mm, namely when the corresponding maximum imaging chip is used, the pixel can reach 16K pixels, and the maximum optical distortion of the full view field is lower than 0.035%; the whole group of focusing modes is adopted, and the clear aperture can be flexibly adjusted.
Drawings
The accompanying drawings, which are described herein, serve to provide a further understanding of the invention and constitute a part of this specification, and the exemplary embodiments and descriptions thereof are provided to explain the invention and not to constitute an undue limitation on the invention. In the drawings:
FIG. 1 is a diagram of an optical system according to a first embodiment;
FIG. 2 is a graph of optical distortion of the optical system of the lens according to the first embodiment;
in the figure: 1-a diaphragm; 2-an image plane; g1 — first lens; g2 — second lens; g3-third lens; g4-fourth lens; g5-fifth lens; g6-sixth lens; g7-seventh lens; u1-first cemented lens group; u2-second cemented lens group.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, within which a person skilled in the art can solve the technical problem to substantially achieve the technical result.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", horizontal "and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The present invention will be described in further detail with reference to the accompanying drawings, which are not intended to limit the present invention.
The embodiment provides a high-magnification wide-working-distance line-scan lens, which comprises a mechanical system and an optical system arranged in the mechanical system, wherein the optical system is provided with a first lens group S1, a diaphragm 1 and a second lens group S2 in sequence from an object side to an image side, and when the working distance is changed, the first lens group S1, the diaphragm 1 and the second lens group S2 focus in a front-back moving mode;
the first lens group S1 comprises a first lens G1 with positive focal power and a meniscus structure, a second lens G2 with positive focal power and a meniscus structure, a third lens G3 with positive focal power and a meniscus structure, and a fourth lens G4 with negative focal power and a meniscus structure;
the second lens group S2 includes a fifth lens G5 having negative power and a biconcave structure, a sixth lens G6 having positive power and a biconvex structure, a seventh lens G7 having positive power and a meniscus structure;
the third lens G3 is cemented with the fourth lens G4 to form a first cemented lens group U1 with negative power, and the fifth lens G5 is cemented with the sixth lens G6 to form a second cemented lens group U2 with negative power;
focal length f of the optical system, and focal length f of the first cemented lens group U1U1Focal length f of the second cemented lens group U2U2，fU1The ratio of f to f satisfies the relation: 0.50 < | fU1/f|＜1.0；fU2The ratio of f to f satisfies the relation: 3.0 < | fU2/f|＜5.0。
Further, a distance L between a vertex of the first lens G1 close to the object side surface to a vertex of the seventh lens G7 close to the image side surface and a focal length f of the optical system satisfy the relationship: 0.40 < | L/f |.
Further, the distance between the seventh lens G7 of the optical system and the image plane 2, i.e. the optical back focal length BFL, and the focal length f of the optical system satisfy the following relation: i BFL/f I is less than 1.50.
Further, the half-image height y' of the optical system and the focal length f of the optical system satisfy the relation: the | y'/f | is less than 0.50.
Further, the refractive index of the first lens G1 is n1, 1.40 < n1 < 1.60.
Further, the refractive index of the second lens G2 is n2, 1.85 < n2 < 1.95.
Further, the third lens has a focal length fG3The focal length of the fourth lens is fG4，fG3And fU1The ratio of (A) satisfies the relation: 1.0 < | fG3/fU1|＜1.50，fG4And fU1The ratio of (A) satisfies the relation: 0.35 < | fG4/fU1|＜0.60。
Further, the fifth lens has a focal length fG5The focal length of the sixth lens is fG6，fG5And fG6The ratio of (A) satisfies the relation: 0.55 < | fG5/fG6|＜0.90。
Further, the refractive index of the seventh lens G7 is n7, 1.85 < n7 < 1.95.
Furthermore, each lens is a spherical mirror, the aperture of the diaphragm 1 is a circular hole, and the aperture of the diaphragm 1 is adjustable within the range of F4.8-F32.
The first embodiment is as follows: as shown in FIG. 1, the high-magnification wide-working-distance line-scanning industrial lens is realized through the structure, the focal length is 116mm, the magnification is 0.425X-0.575X, the applicable working distance is 286 mm-357 mm, the image F number is 4.8, the maximum imaging surface is phi 82mm, the resolution can reach 100lp/mm, namely when the corresponding maximum imaging chip is used, the pixel can reach 16K pixels, and the maximum optical distortion of the full view field is lower than 0.035%; the whole group of focusing modes is adopted, and the clear aperture can be flexibly adjusted. Specific optical system data are as follows:
in example one, the focal length F of the optical system is 116mm, the maximum aperture is F # -4.8, and the focal length F of the first cemented lens groupU1-101.1mm, focal length f of the second cemented lens groupU2A distance L from a vertex of the front surface of the first lens G1 to a vertex of the rear surface of the seventh lens G7 is 69.9mm, -an optical back intercept BFL is 123.3mm, -a half-image height y' is 41.0mm, and a focal length f of the third lens G3 is-464.6 mmG3125.9mm, focal length f of the fourth lens G4G4Focal length f of-50.3 mm, fifth lens G5G5Focal length f of the sixth lens G6 ═ 32.7mmG6＝42.0mm
Each relation: l fU1/f|＝0.87；|fU2/f|＝4.01；|L/f|＝0.60；
|BFL/f|＝1.06；|y’/f|＝0.35；|fG3/fU1|＝1.25；|fG4/fU1|＝0.50
|fG5/fG6|＝0.78
Satisfy the relation: 0.50<|fU1/f|<1.0；3.0<|fU2/f|<5.0；0.40＜|L/f|
|BFL/f|＜1.50；|y’/f|＜0.50；1.0＜|fG3/fU1|＜1.50；
0.35＜|fG4/fU1|＜0.60；0.55＜|fG5/fG6|＜0.90。
FIG. 2 is a graph showing the optical distortion of the present embodiment, wherein the maximum optical distortion is less than 0.035% over the full field of view;
while the foregoing description shows and describes several preferred embodiments of the invention, it is to be understood, as noted above, that the invention is not limited to the forms disclosed herein, but is not intended to be exhaustive of other embodiments, and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed above, or as otherwise known in the relevant art. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.
Claims (10)
1. The utility model provides a wide working distance line of high magnification sweeps camera lens which characterized in that: the optical system is arranged in the mechanical system, the optical system is provided with a first lens group S1, a diaphragm (1) and a second lens group S2 in sequence from an object side to an image side, and when the working distance is changed, the first lens group S1, the diaphragm (1) and the second lens group S2 are focused in a front-back moving mode;
the first lens group S1 comprises a first lens G1 with positive focal power and a meniscus structure, a second lens G2 with positive focal power and a meniscus structure, a third lens G3 with positive focal power and a meniscus structure, and a fourth lens G4 with negative focal power and a meniscus structure;
the second lens group S2 includes a fifth lens G5 having negative power and a biconcave structure, a sixth lens G6 having positive power and a biconvex structure, a seventh lens G7 having positive power and a meniscus structure;
the third lens G3 is cemented with the fourth lens G4 to form a first cemented lens group U1 with negative power, and the fifth lens G5 is cemented with the sixth lens G6 to form a second cemented lens group U2 with negative power;
the focal length f of the optical system and the focal length f of the first cemented lens group U1U1Focal length f of the second cemented lens group U2U2，fU1The ratio of f to f satisfies the relation: 0.50 < | fU1/f|＜1.0；fU2The ratio of f to f satisfies the relation: 3.0 < | fU2/f|＜5.0。
2. The high-magnification wide-working-distance line-scan lens according to claim 1, wherein: a distance L between a vertex of the first lens G1 near the object side surface to a vertex of the seventh lens G7 near the image side surface and a focal length f of the optical system satisfy the relation: 0.40 < | L/f |.
3. The high-magnification wide-working-distance line-scan lens according to claim 1, wherein: the distance between the seventh lens G7 of the optical system and the image plane (2), namely the optical back intercept BFL, and the focal length f of the optical system satisfy the relation: i BFL/f I is less than 1.50.
4. The high-magnification wide-working-distance line-scan lens according to claim 1, wherein: the half-image height y' of the optical system and the focal length f of the optical system satisfy the relation: the | y'/f | is less than 0.50.
5. The high-magnification wide-working-distance line-scan lens according to claim 1, wherein: the refractive index of the first lens G1 is n1, and 1.40 < n1 < 1.60.
6. The high-magnification wide-working-distance line-scan lens according to claim 1, wherein: the refractive index of the second lens G2 is n2, and 1.85 < n2 < 1.95.
7. The high-magnification wide-working-distance line-scan lens according to claim 1, wherein: the focal length of the third lens is fG3The focal length of the fourth lens is fG4，fG3And fU1The ratio of (A) satisfies the relation: 1.0 < | fG3/fU1|＜1.50，fG4And fU1The ratio of (A) satisfies the relation: 0.35 < | fG4/fU1|＜0.60。
8. The high-magnification wide-working-distance line-scan lens according to claim 1, wherein: the focal length of the fifth lens is fG5A focal length f of the sixth lensG6，fG5And fG6The ratio of (A) satisfies the relation: 0.55 < | fG5/fG6|＜0.90。
9. The high-magnification wide-working-distance line-scan lens according to claim 1, wherein: the refractive index of the seventh lens G7 is n7, and n7 is more than 1.85 and less than 1.95.
10. The high-magnification wide-working-distance line-scan lens according to claim 1, wherein: each lens is a spherical mirror, the aperture of the diaphragm (1) is a round hole, and the aperture of the diaphragm (1) is adjustable within the range of F4.8-F32.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111142233A (en) * | 2020-01-14 | 2020-05-12 | 广东奥普特科技股份有限公司 | A high magnification and wide working distance line scan lens |
| CN111142233B (en) * | 2020-01-14 | 2025-04-11 | 广东奥普特科技股份有限公司 | A high magnification and wide working distance line scan lens |
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2020
- 2020-01-14 CN CN202020072716.3U patent/CN211603687U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111142233A (en) * | 2020-01-14 | 2020-05-12 | 广东奥普特科技股份有限公司 | A high magnification and wide working distance line scan lens |
| CN111142233B (en) * | 2020-01-14 | 2025-04-11 | 广东奥普特科技股份有限公司 | A high magnification and wide working distance line scan lens |
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