A positioning marking system for highly specular reflective workpieces

Abstract

The utility model relates to the technical field of machine vision detection, and discloses a positioning and marking system for a highly specular reflective workpiece, including a laser and a machine vision device; the machine vision device includes an image acquisition module, a first light source, and a second light source; the image acquisition module, the first light source, the laser, and the second light source are arranged in sequence, and the second light source is provided with an avoidance hole for the laser emitted by the laser to pass through; the first light source is used to illuminate the central area of ​​the highly specular reflective workpiece; the second light source is used to illuminate the surrounding area of ​​the highly specular reflective workpiece, and the surrounding area is located around the above-mentioned central area. The utility model not only avoids mutual interference between the light source and the laser, but also makes full use of the lighting effect of the light source, so that the highly specular reflective workpiece is uniformly and brightly illuminated as a whole, ensuring that a clear and accurate image of the workpiece surface can be captured, providing strong support for subsequent precise positioning and marking operations.

Description

Technical Field

[0001] The utility model relates to the technical field of machine vision detection, in particular to a positioning and marking system for a highly specular reflective workpiece. Background Art

[0002] With the widespread application of laser technology in the industrial field, machine vision plays a vital role in laser marking operations, providing precise positioning coordinates for marking operations.

[0003] When positioning and marking highly specular reflective workpieces with smooth surfaces and excellent reflective properties, such as copper foil, traditional methods often use high-angle lighting to stimulate the reflection of the copper foil and obtain high-contrast images. However, when using a traditional coaxial light source to work synchronously with a laser, the relative position of the coaxial light source and the laser becomes a major challenge. If the laser is placed below the coaxial light source, its beam splitter will block the irradiation of the coaxial light source, reducing the amount of light emitted by the coaxial light source reaching the copper foil, resulting in uneven copper foil lighting imaging; conversely, if the coaxial light source is located below the laser, the laser emitted by the laser will pass through the beam splitter of the coaxial light source and damage it, and will also affect the laser irradiation effect. When using a ring light source with a hole in the middle for lighting, although it will not interfere with the laser, due to the specular reflection characteristics of the copper foil, a dark spot will be formed in the middle of the copper foil, which will interfere with its positioning.

[0004] Therefore, it is particularly important to improve the existing technology of using light sources and lasers in combination, so as to achieve accurate and uniform lighting and imaging of highly specular reflective workpieces, thereby improving the positioning accuracy and operating efficiency of laser marking.

[0005] The above information is presented as background information only to assist with understanding the present disclosure and no determination or admission is made as to whether any of the above may be used as prior art with respect to the present disclosure. Utility Model Content

[0006] The utility model provides a positioning and marking system for a highly specularly reflective workpiece, so as to solve the problems existing in the prior art.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A positioning and marking system for a highly specular reflective workpiece includes a laser and a machine vision device; wherein:

[0009] The machine vision device includes an image acquisition module, a first light source and a second light source;

[0010] The image acquisition module, the first light source, the laser and the second light source are arranged in sequence, and the second light source is provided with an avoidance hole for the laser emitted by the laser to pass through;

[0011] The first light source is used to illuminate the central area of ​​a highly specular reflective workpiece;

[0012] The second light source is used to illuminate a peripheral area of ​​the highly specular reflective workpiece, wherein the peripheral area is located around the central area.

[0013] Furthermore, in the positioning and marking system for the highly specular reflective workpiece, the image acquisition module is located above the observation port of the first light source;

[0014] The laser is located below the light outlet of the first light source.

[0015] Furthermore, in the positioning and marking system for a highly specular reflective workpiece, the first light source is a coaxial light source.

[0016] Furthermore, in the positioning and marking system for the highly specular reflective workpiece, the avoidance hole is provided at the center of the second light source;

[0017] The laser is located above the avoidance hole;

[0018] The highly specular reflective workpiece is located below the light emitting surface of the second light source.

[0019] Furthermore, in the positioning and marking system for a highly specular reflective workpiece, the second light source is an annular light source.

[0020] Furthermore, in the positioning and marking system for the highly specular reflective workpiece, the distance between the second light source and the highly specular reflective workpiece is 220±10 mm.

[0021] Furthermore, in the positioning and marking system for the highly specular reflective workpiece, the distance between the laser and the highly specular reflective workpiece is 250±10 mm.

[0022] Furthermore, in the positioning and marking system for the highly specular reflective workpiece, the distance between the first light source and the highly specular reflective workpiece is 300±10 mm.

[0023] Furthermore, in the positioning and marking system for the highly specular reflective workpiece, the distance between the image acquisition module and the highly specular reflective workpiece is 360±10 mm.

[0024] Further, in the positioning and marking system for the highly specular reflective workpiece, the image acquisition module includes an area array camera and a lens;

[0025] The lens is a 50mm fixed-focus lens, the object distance is 360mm, and the field of view is 40*28mm.

[0026] Compared with the prior art, the utility model has the following beneficial effects:

[0027] The utility model provides a positioning and marking system for a highly specular reflective workpiece. An image acquisition module, a first light source, a laser, and a second light source are sequentially arranged, and the second light source is designed to have an avoidance hole for the laser emitted by the laser to pass through, so that the central area of ​​the highly specular reflective workpiece can be illuminated by the first light source, and the remaining surrounding area can be illuminated by the second light source. This not only avoids mutual interference between the light source and the laser, but also makes full use of the lighting effect of the light source, so that the highly specular reflective workpiece is uniformly and brightly illuminated as a whole, ensuring that a clear and accurate image of the workpiece surface can be captured, providing strong support for subsequent precise positioning and marking operations.

[0028] The present invention has other characteristics and advantages, which will be apparent from the accompanying drawings and subsequent specific embodiments incorporated herein, or will be described in detail in the accompanying drawings and subsequent specific embodiments incorporated herein, which together are used to explain the specific principles of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is a schematic structural side view of a positioning and marking system for a highly specularly reflective workpiece provided by an embodiment of the utility model;

[0031] Figure 2 It is a structural stereoscopic schematic diagram of a machine vision device provided by an embodiment of the utility model;

[0032] Figure 3 It is a schematic side view of the structure of the machine vision device provided by an embodiment of the utility model.

[0033] Reference numerals:

[0034] Laser 1, image acquisition module 2, first light source 3, second light source 4, avoidance hole 5, observation port 6, light outlet 7, light outlet surface 8, high-mirror reflective workpiece 9. DETAILED DESCRIPTION

[0035] In order to explain in detail the possible application scenarios, technical principles, specific schemes that can be implemented, and the purposes and effects that can be achieved, the following is a detailed description of the specific embodiments listed in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0036] Reference to "embodiment" herein means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the various technical features mentioned in the embodiments can be combined in any way to form a corresponding implementable technical solution.

[0037] Unless otherwise defined, the technical terms used in this document have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms in this document is only for describing specific embodiments and is not intended to limit this application.

[0038] In the description of this application, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that three relationships may exist, for example, A and / or B, which means: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this article generally indicates that the objects before and after are in an "or" logical relationship.

[0039] In the present application, terms such as “first” and “second” are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship of quantity, priority or sequence between these entities or operations.

[0040] Without further limitations, in this application, the words "include", "comprises", "has" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those limited elements, but also other elements not explicitly listed, or also include elements inherent to such process, method or product.

[0041] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than", "less than", "exceed" and the like are understood to exclude the number itself; expressions such as "above", "below", "within" and the like are understood to include the number itself. In addition, in the description of the embodiments of this application, "multiple" means more than two (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups", "multiple times", etc., unless otherwise clearly and specifically limited.

[0042] In the description of the embodiments of the present application, space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present application or facilitating the reader's understanding, and do not indicate or imply that the referred device or component must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0043] Unless otherwise expressly specified or limited, in the description of the embodiments of the present application, the terms such as "install", "connect", "connect", "fix", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For technicians in the technical field to which the present application belongs, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0044] In view of the above-mentioned defects in the prior art, the applicant, based on many years of rich practical experience and professional knowledge in design and manufacturing in this field, and in conjunction with the application of theory, actively conducts research and innovation in the hope of creating a technology that can solve the defects in the prior art. After continuous research and design, and after repeated trial production and improvement, the present utility model with real practical value was finally created.

[0045] Please refer to Figure 1-3 The embodiment of the utility model provides a positioning and marking system for a highly specular reflective workpiece, which mainly includes a laser 1 and a machine vision device. The machine vision device is composed of an image acquisition module 2, a first light source 3 and a second light source 4.

[0046] These components are arranged in a specific order in a specific direction: for example, from top to bottom, the image acquisition module 2 is arranged first, followed by the first light source 3, followed by the laser 1, and finally the second light source 4. It is particularly worth mentioning that a avoidance hole 5 is provided in the design of the second light source 4, which cleverly allows the laser beam emitted by the laser 1 to pass through without causing any obstruction to the transmission of the laser.

[0047] The main function of the first light source 3 is to specifically illuminate the central area of ​​the highly specular reflective workpiece 9. This is because the first light source 3 can only illuminate the central area of ​​the highly specular reflective workpiece 9 due to the obstruction of the laser 1. However, in this embodiment, the first light source 3 only needs to ensure that the central area of ​​the highly specular reflective workpiece 9 obtains sufficient brightness, so that the image acquisition module 2 can capture a clear and accurate image of the central area.

[0048] The second light source 4 is responsible for illuminating the surrounding areas of the highly specular reflective workpiece 9, which are located around the central area of ​​the reflective workpiece 9. Through the illumination of the second light source 4, the areas that were originally not illuminated by the first light source 3 are now supplemented by the second light source 4, and the overall brightness of the highly specular reflective workpiece 9 is improved. In addition, due to the existence of the avoidance hole 5, the operation of the laser 1 will not be affected in any way.

[0049] Through such a layout and design, the embodiment of the utility model not only successfully solves the problem of mutual interference between the light source and the laser 1 in the traditional technology, but also, through a reasonable lighting layout, enables the highly specular reflective workpiece 9 to be evenly and brightly illuminated. This design ensures that the image acquisition module 2 can capture a clear and accurate image of the workpiece surface, providing accurate data support for subsequent positioning and marking operations, thereby improving the positioning accuracy and operating efficiency of laser marking, and has broad application prospects and important practical value.

[0050] Please refer again Figure 1-3 In this embodiment, the image acquisition module 2 is located above the observation port 6 of the first light source 3. Such a layout enables the image acquisition module 2 to directly obtain a clear image of the central area of ​​the highly specular reflective workpiece 9 illuminated by the first light source 3. By placing the image acquisition module 2 above the observation port 6, it can be ensured that the light is directly collected after being reflected by the workpiece, reducing the refraction and scattering of the light and improving the image quality.

[0051] Meanwhile, the laser 1 is located below the light outlet 7 of the first light source 3. Such a layout design enables the light emitted by the first light source 3 to pass through the beam splitter of the laser 1 and accurately irradiate the workpiece together with the laser beam, but the beam splitter of the laser 1 will cause the light emitted by the first light source 3 to irradiate only the central area of ​​the workpiece 9 with a high degree of specular reflection.

[0052] Exemplarily, the first light source 3 can be a coaxial light source. The coaxial light source is particularly suitable for illuminating the surface of the workpiece due to its uniform and soft lighting effect. By selecting a coaxial light source as the first light source 3, it can be ensured that the central area of ​​the workpiece is uniformly and brightly illuminated, providing high-quality image data for the image acquisition module 2.

[0053] Please refer again Figure 1-3 In this embodiment, the avoidance hole 5 is opened at the center of the second light source 4;

[0054] The laser 1 is located above the avoidance hole 5;

[0055] The highly specular reflective workpiece 9 is located below the light emitting surface 8 of the second light source 4 .

[0056] In this embodiment, the avoidance hole 5 is opened at the center of the second light source 4. Such a design can ensure that the light emitted by the second light source 4 illuminates the surrounding area of ​​the highly mirror-reflective workpiece 9, and can also ensure that the light emitted by the first light source 3 illuminates the central area of ​​the highly mirror-reflective workpiece 9 after passing through the beam splitter of the laser 1.

[0057] At the same time, the highly specular reflective workpiece 9 is located below the light emitting surface 8 of the second light source 4. Such a layout enables the light emitted by the second light source 4 to directly illuminate the surrounding area of ​​the workpiece, providing a uniform lighting effect. By placing the workpiece below the light emitting surface, the lighting effect of the second light source 4 can be maximized to ensure that the brightness of the surrounding area of ​​the workpiece is sufficient, thereby improving the accuracy of image acquisition and the precision of marking.

[0058] Exemplarily, the second light source 4 may be a ring light source. Due to the ring design, the ring light source can emit light in a ring direction, just corresponding to the surrounding area of ​​the highly specular reflective workpiece 9, so that the surrounding area of ​​the highly specular reflective workpiece 9 can be evenly illuminated.

[0059] Please refer again Figure 1 In this embodiment, the distance between the second light source 4 and the highly specular reflective workpiece 9 is precisely set to 220±10 mm. This distance is set based on the results of multiple experiments and tests to find the best lighting effect.

[0060] By controlling the distance between the second light source 4 and the highly specular reflective workpiece 9 within the range of 220±10 mm, it can be ensured that the light emitted by the second light source 4 can fully cover the surrounding area of ​​the highly specular reflective workpiece 9 and provide sufficient lighting intensity. At the same time, the appropriate distance can also avoid the light being too strong or too weak, thereby ensuring that the image acquisition module can capture clear and accurate images.

[0061] It should be noted that the setting of this distance is not absolute, and in actual applications, it may be necessary to make fine adjustments based on factors such as the size, surface characteristics, and power of the light source of the specific highly specular reflective workpiece 9. But in general, controlling the distance between the second light source 4 and the highly specular reflective workpiece 9 within a certain range is one of the keys to ensuring the system lighting effect and positioning marking accuracy.

[0062] Please refer again Figure 1 In this embodiment, the distance between the laser 1 and the highly specular reflective workpiece 9 is specifically set to 250±10 mm. This distance is set based on the results of multiple experiments and precise calculations to ensure that the laser beam can accurately irradiate the surface of the highly specular reflective workpiece 9 and achieve efficient marking operations.

[0063] Controlling the distance between the laser 1 and the highly specular reflective workpiece 9 within the range of 250±10mm can ensure that the laser beam will not cause excessive energy attenuation during transmission due to the long distance, thereby maintaining sufficient marking force and clarity. At the same time, the appropriate distance can also prevent the laser beam from causing unnecessary heat effects or damage to the highly specular reflective workpiece 9 due to being too close.

[0064] It should be noted that the setting of this distance is not absolute. In actual application, it may be necessary to make fine adjustments based on factors such as the specific power of the laser 1, the size of the highly specular reflective workpiece 9, and the marking requirements. But in general, controlling the distance between the laser 1 and the highly specular reflective workpiece 9 within a certain range is one of the keys to ensure the laser marking effect.

[0065] Please refer again Figure 1 In this embodiment, the distance between the first light source 3 and the highly specular reflective workpiece 9 is precisely controlled and set to 300±10 mm. This distance is set after in-depth research and experimental verification to ensure that the first light source 3 can illuminate the central area of ​​the highly specular reflective workpiece 9 in the best way.

[0066] Controlling the distance between the first light source 3 and the highly specular reflective workpiece 9 within the range of 300±10mm can ensure that the light emitted by the light source can fully cover the central area of ​​the highly specular reflective workpiece 9, while avoiding interference with image acquisition caused by excessive or weak light. This distance setting ensures that the brightness of the central area is moderate, and the image acquisition module can capture clear and accurate images, providing reliable data support for subsequent positioning and marking operations.

[0067] It should be noted that the distance setting is not fixed, and in actual applications, it may be necessary to make fine adjustments based on factors such as the specific size, surface characteristics, and power of the light source of the highly specular reflective workpiece 9. However, in general, controlling the distance between the first light source 3 and the highly specular reflective workpiece 9 within a certain range is one of the keys to ensuring the lighting effect and positioning accuracy of the system.

[0068] Please refer again Figure 1 In this embodiment, the distance between the image acquisition module 2 and the highly specular reflective workpiece 9 is precisely controlled and set to 360±10 mm. The setting of this distance is based on comprehensive considerations of system performance optimization and actual application requirements.

[0069] Controlling the distance between the image acquisition module 2 and the highly specular reflective workpiece 9 within the range of 360±10 mm can ensure that the image acquisition module 2 can capture sufficiently clear and accurate images of the highly specular reflective workpiece 9. The appropriate distance not only helps to reduce the distortion and distortion during the image acquisition process, but also ensures that the image acquisition module 2 can fully cover the surface of the highly specular reflective workpiece 9 and obtain complete image information.

[0070] At the same time, by precisely controlling this distance, the stability and reliability of image acquisition can also be improved. Too far a distance may cause the image to be blurred or lose details, while too close a distance may introduce too many shadows and reflections, affecting the image quality. Therefore, controlling the distance between the image acquisition module 2 and the highly specular reflective workpiece 9 within a certain range helps to maintain the consistency and repeatability of image acquisition.

[0071] In addition, the setting of this distance also takes into account the convenience of operation and space layout requirements in practical applications. Through reasonable distance control, it can be ensured that the operator can easily adjust the position and angle of the image acquisition module 2 to adapt to different heights of mirror reflective workpieces 9 and operating requirements.

[0072] In this embodiment, the design details of the image acquisition module 2 are further clarified and optimized. The module is mainly composed of an array camera and a lens, and this combination ensures both high efficiency of image acquisition and clarity of image quality.

[0073] Specifically, a 50mm fixed-focus lens was selected. Compared with a zoom lens, a fixed-focus lens has higher optical performance and less distortion, especially within a specific working distance and field of view. This choice helps ensure that the image acquisition module can capture clear and accurate images, providing reliable data support for subsequent positioning and marking operations.

[0074] At the same time, the object distance of the lens is set to 360mm. Object distance refers to the distance between the lens and the subject, and the setting of this parameter directly affects the clarity and field of view of the image. By accurately controlling the object distance, it can ensure that the lens can capture enough details while avoiding image distortion or blur.

[0075] In addition, the field of view of the lens is also determined to be 40*28mm. The field of view refers to the maximum range that the lens can capture, and the setting of this parameter is optimized according to the actual application requirements. By reasonably setting the field of view, it can be ensured that the image acquisition module can cover the key areas of the workpiece while avoiding interference from irrelevant information.

[0076] Although the terms such as laser, image acquisition module, first light source, second light source, avoidance hole, etc. are used more frequently in this application, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

[0077] The utility model provides a positioning and marking system for a highly specular reflective workpiece. An image acquisition module, a first light source, a laser, and a second light source are sequentially arranged, and the second light source is designed to have an avoidance hole for the laser emitted by the laser to pass through, so that the central area of ​​the highly specular reflective workpiece can be illuminated by the first light source, and the remaining surrounding area can be illuminated by the second light source. This not only avoids mutual interference between the light source and the laser, but also makes full use of the lighting effect of the light source, so that the highly specular reflective workpiece is uniformly and brightly illuminated as a whole, ensuring that a clear and accurate image of the workpiece surface can be captured, providing strong support for subsequent precise positioning and marking operations.

[0078] Finally, it should be noted that although the above embodiments have been described in the specification and drawings of this application, this does not limit the scope of patent protection of this application. All technical solutions generated by replacing or modifying equivalent structures or equivalent processes based on the essential concept of this application using the contents recorded in the specification and drawings of this application, as well as directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are included in the scope of patent protection of this application.

Claims

1. A positioning and marking system for highly specular reflective workpieces, characterized in that: It comprises a laser (1) and a machine vision device; wherein, The machine vision device comprises an image acquisition module (2), a first light source (3) and a second light source (4); The image acquisition module (2), the first light source (3), the laser (1) and the second light source (4) are arranged in sequence, and the second light source (4) is provided with an avoidance hole (5) for the laser light emitted by the laser (1) to pass through; The first light source (3) is used to illuminate the central area of ​​a highly specular reflective workpiece; The second light source (4) is used to illuminate the surrounding area of ​​the highly specular reflective workpiece, wherein the surrounding area is located around the central area.

2. The positioning and marking system for highly specular reflective workpieces according to claim 1, characterized in that: The image acquisition module (2) is located above the observation port (6) of the first light source (3); The laser (1) is located below the light outlet (7) of the first light source (3).

3. The positioning and marking system for highly specular reflective workpieces according to claim 1 or 2, characterized in that: The first light source (3) is a coaxial light source.

4. The positioning and marking system for highly specular reflective workpieces according to claim 1, characterized in that: The avoidance hole (5) is provided at the center of the second light source (4); The laser (1) is located above the avoidance hole (5); The highly specular reflective workpiece is located below the light emitting surface (8) of the second light source (4).

5. The positioning and marking system for highly specular reflective workpieces according to claim 1 or 4, characterized in that: The second light source (4) is a ring-shaped light source.

6. The positioning and marking system for highly specular reflective workpieces according to claim 1, characterized in that: The distance between the second light source (4) and the highly specular reflective workpiece is 220±10 mm.

7. The positioning and marking system for highly specular reflective workpieces according to claim 6, characterized in that: The distance between the laser (1) and the highly specular reflective workpiece is 250±10 mm.

8. The positioning and marking system for highly specular reflective workpieces according to claim 7, characterized in that: The distance between the first light source (3) and the highly specular reflective workpiece is 300±10 mm.

9. The positioning and marking system for highly specular reflective workpieces according to claim 8, characterized in that: The distance between the image acquisition module (2) and the highly specular reflective workpiece is 360±10 mm.

10. The positioning and marking system for highly specular reflective workpieces according to claim 1, characterized in that: The image acquisition module (2) comprises an area array camera and a lens; The lens is a 50mm fixed-focus lens, the object distance is 360mm, and the field of view is 40*28mm.

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