CN117572609A - Line sweeps camera lens and machine vision equipment - Google Patents
Line sweeps camera lens and machine vision equipment Download PDFInfo
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- CN117572609A CN117572609A CN202311568236.0A CN202311568236A CN117572609A CN 117572609 A CN117572609 A CN 117572609A CN 202311568236 A CN202311568236 A CN 202311568236A CN 117572609 A CN117572609 A CN 117572609A
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- 230000003287 optical effect Effects 0.000 claims abstract description 50
- 230000005499 meniscus Effects 0.000 claims description 18
- 238000001514 detection method Methods 0.000 abstract description 14
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 239000000306 component Substances 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000008358 core component Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/143—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only
- G02B15/1431—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being positive
- G02B15/143107—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being positive arranged +++
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- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The invention discloses a line scanning lens and machine vision equipment, wherein the line scanning lens comprises the following components in sequence: a front set of lenses having positive optical power; a middle group lens having positive optical power; a rear group lens having positive optical power; the front group of lenses and the middle group of lenses are provided with diaphragms; the focal length f of the line scanning lens and the focal length f of the front group lens S1 Focal length f of the middle group lens S2 And focal length f of rear group lens S3 The following relation is satisfied: 1.40<|f S1 /f|<2.10；5.50<|f S2 /f|<8.50；0.60<|f S3 /f|<1.20. The focal lengths of the front group lens, the middle group lens and the rear group lens are reasonably limited, so that the resolution ratio of the line scanning lens is effectively improved, the maximum optical distortion of the full view field is reduced, and the accuracy of a detection result can be ensured when the line scanning lens is used for detection.
Description
Technical Field
The invention relates to the technical field of machine vision lenses, in particular to a line scanning lens and machine vision equipment.
Background
Along with the continuous upgrading of industrial automation, the line scanning industrial lens is widely applied to various industries, particularly to the lithium battery industry, the line scanning lens can acquire and analyze images of a lithium battery at high speed and high precision, and plays an important role in the production and detection of the lithium battery.
The application requirements of the line scanning industrial lens in the lithium battery industry are as follows: appearance defect detection, dimensional accuracy detection, joint welding quality detection, battery cell internal detection, label quality detection and the like, and the optical performance of the linear scanning industrial lens serving as a core component directly influences the accuracy of a measuring system, and in a high-accuracy detection project, the resolution of the lens is required to be high enough, the distortion of the lens is also required to be small enough, and otherwise the accuracy of a detection result is influenced. However, the existing line scanning industrial lens has the defects of different degrees in terms of resolution and distortion, and is difficult to meet the actual requirements.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a line scanning lens and a machine vision device, and solves the problems that the performance of the existing line scanning industrial lens in terms of resolution and distortion has different degrees and is difficult to meet the actual demands.
In order to achieve the above object, the present invention provides the following technical solutions:
a line scanning lens is sequentially provided with:
a front set of lenses having positive optical power;
a middle group lens having positive optical power;
a rear group lens having positive optical power;
the front group of lenses and the middle group of lenses are provided with diaphragms;
the focal length f of the line scanning lens and the focal length f of the front group lens S1 Focal length f of the middle group lens S2 And focal length f of rear group lens S3 The following relation is satisfied:
1.40<|f S1 /f|<2.10；
5.50<|f S2 /f|<8.50；
0.60<|f S3 /f|<1.20。
optionally, the front group of lenses includes:
a first lens having positive optical power, the first lens being of a meniscus configuration;
a second lens with positive and negative focal power, wherein the second lens is in a meniscus structure;
a third lens having positive optical power, the third lens being of a meniscus configuration;
wherein the second lens and the third lens are glued to form a first glued lens group with positive focal power.
Optionally, the middle group lens includes:
a fourth lens with negative focal power, wherein the fourth lens is in a biconcave structure;
a fifth lens having positive optical power, the fifth lens having a biconvex structure;
a sixth lens having negative optical power, the sixth lens being in a meniscus configuration;
a seventh lens having positive optical power, the seventh lens being of a meniscus configuration;
wherein the fourth lens and the fifth lens are glued to form a second glued lens group with positive focal power; the sixth lens and the seventh lens are cemented into a third cemented lens group having negative optical power.
Optionally, the focal length f of the first cemented lens group U1 Focal length f of first lens G1 Focal length f of second cemented lens group U2 Focal length f of third cemented lens group U3 And the focal length f of the line scan lens satisfies the relation:
4.50＜|f U1 /f|＜6.00；
2.50＜|f G1 /f|＜3.50；
0.85＜|f U2 /f|＜1.50；
1.45＜|f U3 /f|＜1.90。
optionally, the rear group lens includes:
an eighth lens having positive optical power, the eighth lens having a meniscus configuration.
Optionally, each lens in the front group of lenses, the middle group of lenses and the rear group of lenses is a spherical lens.
Optionally, a distance L from a front surface vertex of the first lens to a rear surface vertex of the eighth lens, a half image height y' of the line scan lens, and a focal length f of the line scan lens satisfy the relationship:
|L/f|>1.00；
|y'/f|＜0.45。
optionally, the optical back intercept BFL of the line scan lens and the focal length f of the line scan lens satisfy the relationship:
|BFL/f|＜0.85。
optionally, the aperture of the diaphragm is a round hole, and the aperture of the diaphragm is adjustable within the range of F4.0-F16.
The invention also provides a machine vision device comprising a line scan lens as claimed in any one of the preceding claims.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a line scanning lens and machine vision equipment, which comprises a front group of lenses, a middle group of lenses and a rear group of lenses, wherein the focal lengths of the front group of lenses, the middle group of lenses and the rear group of lenses are reasonably limited so as to effectively improve the resolution of the line scanning lens, reduce the maximum optical distortion of a full view field and ensure the accuracy of detection results when the line scanning lens is used for detection.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a line scanning lens according to the present invention;
fig. 2 is a graph of optical distortion of a line scan lens according to the present invention.
In the above figures: s1, a front group of lenses; s2, middle group lenses; s3, a rear group of lenses; g1, a first lens; g2, a second lens; g3, a third lens; g4, fourth lens; g5, fifth lens; g6, sixth lens; g7, seventh lens; g8, eighth lens; u1, a first cemented lens group; u2, a second cemented lens group; and U3, a third cemented lens group.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is apparent that the embodiments described below are only some embodiments of the present invention, not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it will be understood that when one component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present.
Furthermore, the terms "long," "short," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship based on that shown in the drawings, for convenience of description of the present invention, and are not intended to indicate or imply that the apparatus or elements referred to must have this particular orientation, operate in a particular orientation configuration, and thus should not be construed as limiting the invention.
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.
Referring to fig. 1 and fig. 2 in combination, the present invention provides a line scanning lens, which sequentially includes:
a front group lens S1 having positive optical power;
a middle lens S2 having positive optical power;
a rear group lens S3 having positive optical power;
the front group of lenses S1 and the middle group of lenses S2 are provided with diaphragms;
focal length f of the line scanning lens and focal length f of the front group lens S1 S1 Focal length f of the middle group lens S2 S2 ToFocal length f of rear group lens S3 S3 The following relation is satisfied:
1.40<|f S1 /f|<2.10；
5.50<|f S2 /f|<8.50；
0.60<|f S3 /f|<1.20。
in this embodiment, the focal lengths of the front lens group, the middle lens group and the rear lens group are reasonably limited, so that the resolution of the line scanning lens is effectively improved, the maximum optical distortion of the full field of view is reduced, and the accuracy of the detection result can be ensured when the line scanning lens is used for detection.
Further, the front group lens S1 includes:
a first lens G1 having positive optical power, the first lens G1 having a meniscus configuration;
a second lens G2 with positive and negative focal power, wherein the second lens G2 is in a meniscus structure;
a third lens G3 having positive optical power, the third lens G3 having a meniscus configuration;
wherein the second lens G2 and the third lens G3 are cemented into a first cemented lens group U1 having positive optical power.
Further, the middle lens group S2 includes:
a fourth lens G4 with negative focal power, wherein the fourth lens G4 is in a biconcave structure;
a fifth lens G5 having positive optical power, the fifth lens G5 having a biconvex structure;
a sixth lens G6 having negative optical power, the sixth lens G6 having a meniscus configuration;
a seventh lens G7 having positive optical power, the seventh lens G7 having a meniscus configuration;
wherein the fourth lens G4 and the fifth lens G5 are cemented into a second cemented lens group U2 having positive optical power; the sixth lens G6 and the seventh lens G7 are cemented into a third cemented lens group U3 having negative optical power.
In the present embodiment, the focal length f of the first cemented lens group U1 U1 Focal length f of first lens G1 G1 Focal length f of second cemented lens group U2 U2 Focal length f of third cemented lens group U3 U3 And the focal length f of the line scan lens satisfies the relation:
4.50＜|f U1 /f|＜6.00；
2.50＜|f G1 /f|＜3.50；
0.85＜|f U2 /f|＜1.50；
1.45＜|f U3 /f|＜1.90。
in the present embodiment, by controlling the focal length f of the first cemented lens group U1 U1 The focal length f G of the first lens G1, the focal length f U of the second cemented lens group U2 and the focal length f U3 of the third cemented lens group U3 are beneficial to reasonably controlling the overall focal power of the optical system, enabling the deflection angle of light to be in a reasonable range and improving the imaging quality of the lens in an on-axis view field area.
Further, in an embodiment, the rear group lens S3 includes:
an eighth lens G8 having positive optical power, the eighth lens G8 having a meniscus configuration.
In this embodiment, each lens in the front group lens S1, the middle group lens S2 and the rear group lens S3 is a spherical lens.
Further, the distance L from the front surface vertex of the first lens G1 to the rear surface vertex of the eighth lens G8, the half image height y' of the line scan lens, and the focal length f of the line scan lens satisfy the relationship:
|L/f|>1.00；
|y'/f|＜0.45。
the ratio of the half image height y' of the line scanning lens to the focal length f of the line scanning lens is limited from the front surface vertex of the first lens G1 to the rear surface vertex of the eighth lens G8, so that the total length of the lens is shortened, and the miniaturization of the lens is realized.
Further, the optical back intercept BFL of the line scan lens and the focal length f of the line scan lens satisfy the relationship:
|BFL/f|＜0.85。
the ratio of the optical rear intercept BFL of the linear scanning lens to the focal length f of the linear scanning lens is restrained to ensure that the size of the optical rear intercept BFL is unchanged when the lens f is changed, so that the linear scanning lens is suitable for the requirements of a zooming system.
In the present embodiment, when the object distance is changed, the entire group of lenses G1 to G8 is moved back and forth, focusing is performed by changing the back focal length. The aperture of the diaphragm of the line scanning lens is a round hole, and the aperture of the diaphragm is adjustable within the range of F4.0-F16.
In this example, the line scan shot data is as follows:
specifically, the specific values of the foregoing embodiments are as follows:
each relation: |fs1/f|=1.63; |fs2/f|=7.54; |fs3/f|=0.91;
|L/f|＝1.30；|BFL/f|＝0.54；|y'/f|＝0.30；|fU1/f|＝5.24；
|fU2/f|＝1.23；|fU3/f|＝1.69；|fG1/f|＝3.03。
the structure realizes a high-resolution line scanning lens with a focal length of 50mm, wherein the F number of the image side of the lens is 4.0, and the maximum imaging plane isThe resolution can reach 100lp/mm, namely when the corresponding maximum imaging chip is used, the pixel can reach 5.8K pixel, and the maximum optical distortion of the full field is lower than 0.05%; the whole group of focusing modes are adopted, so that the clear aperture can be flexibly adjusted.
Based on the foregoing embodiments, the present invention further provides a machine vision apparatus including the wire sweep lens described in the above embodiments.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The line scanning lens is characterized in that the line scanning lens is provided with:
a front group lens (S1) having positive optical power;
a middle lens (S2) having positive optical power;
a rear group lens (S3) having positive optical power;
the front group lens (S1) and the middle group lens (S2) are provided with diaphragms;
the focal length f of the line scanning lens and the focal length f of the front group lens (S1) S1 Focal length f of the middle group lens (S2) S2 And the focal length f of the rear group lens (S3) S3 The following relation is satisfied:
1.40<|f S1 /f|<2.10；
5.50<|f S2 /f|<8.50；
0.60<|f S3 /f|<1.20。
2. the line scan lens according to claim 1, wherein the front set of lenses (S1) comprises:
a first lens (G1) having positive optical power, the first lens (G1) having a meniscus configuration;
a second lens (G2) having positive and negative power, the second lens (G2) being of a meniscus configuration;
a third lens (G3) having positive optical power, the third lens (G3) having a meniscus configuration;
wherein the second lens (G2) and the third lens (G3) are cemented into a first cemented lens group (U1) having positive optical power.
3. The line scan lens according to claim 2, wherein the middle set of lenses (S2) comprises:
a fourth lens (G4) having negative optical power, the fourth lens (G4) having a biconcave structure;
a fifth lens (G5) having positive optical power, the fifth lens (G5) having a biconvex structure;
a sixth lens (G6) having negative optical power, the sixth lens (G6) having a meniscus configuration;
a seventh lens (G7) having positive optical power, the seventh lens (G7) having a meniscus configuration;
wherein the fourth lens (G4) and the fifth lens (G5) are cemented into a second cemented lens group (U2) having positive optical power; the sixth lens (G6) and the seventh lens (G7) are cemented into a third cemented lens group (U3) having negative optical power.
4. A line scan lens as claimed in claim 3, characterised in that the focal length f of the first cemented lens group (U1) U1 Focal length f of the first lens (G1) G1 Focal length f of second cemented lens group (U2) U2 Focal length f of third cemented lens group (U3) U3 And the focal length f of the line scan lens satisfies the relation:
4.50＜|f U1 /f|＜6.00；
2.50＜|f G1 /f|＜3.50；
0.85＜|f U2 /f|＜1.50；
1.45＜|f U3 /f|＜1.90。
5. a line scan lens as claimed in claim 3, wherein the rear group lens (S3) comprises:
an eighth lens (G8) having positive optical power, the eighth lens (G8) having a meniscus configuration.
6. The line scan lens according to any one of claims 1 to 5, wherein each lens of the front group lens (S1), the middle group lens (S2) and the rear group lens (S3) is a spherical lens.
7. The line scan lens according to claim 5, wherein a distance L from a front surface vertex of the first lens (G1) to a rear surface vertex of the eighth lens (G8), a half image height y' of the line scan lens, and a focal length f of the line scan lens satisfy the relation:
|L/f|>1.00；
|y'/f|＜0.45。
8. the line scan lens of claim 1, wherein the optical back intercept BFL of the line scan lens and the focal length f of the line scan lens satisfy the relationship:
|BFL/f|＜0.85。
9. the line scan lens of claim 1, wherein the aperture of the diaphragm is a circular aperture, and the aperture of the diaphragm is adjustable in the range of F4.0-F16.
10. A machine vision apparatus comprising a line scan lens as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311568236.0A CN117572609A (en) | 2023-11-22 | 2023-11-22 | Line sweeps camera lens and machine vision equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311568236.0A CN117572609A (en) | 2023-11-22 | 2023-11-22 | Line sweeps camera lens and machine vision equipment |
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| CN117572609A true CN117572609A (en) | 2024-02-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119414573A (en) * | 2025-01-08 | 2025-02-11 | 福建浩蓝光电有限公司 | A high-resolution, low-distortion lens and camera device for machine vision |
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2023
- 2023-11-22 CN CN202311568236.0A patent/CN117572609A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119414573A (en) * | 2025-01-08 | 2025-02-11 | 福建浩蓝光电有限公司 | A high-resolution, low-distortion lens and camera device for machine vision |
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