A detection light source device and a machine vision system

Abstract

The utility model relates to machine vision system technical field discloses a kind of detection light source device and machine vision system, detection light source device, including light source, further include the multilayer optical film piece combination of the light-emitting side of the light source, the optical film piece combination sequentially includes along light path direction: the first light-transmitting film layer for promoting light beam illumination uniformity;Transparent protective film layer for projecting light beam and providing structural support;Light attenuation film layer for reducing light beam illumination value;And, the second light-transmitting film layer for promoting light beam illumination uniformity again. By introducing light attenuation film layer, illumination intensity can be effectively reduced under low-illumination detection scene, the reflection light intensity of the surface of measured object is weakened, and the light spot interference caused by specular reflection is reduced, so that dark area details are retained as far as possible, and the accuracy of image recognition is improved.

Description

Technical Field

[0001] This utility model relates to the field of machine vision system technology, and in particular to a detection light source device and a machine vision system. Background Technology

[0002] Machine vision refers to the technology that uses machines to replace human eyes in making various measurements and judgments, and it has become an important approach to non-destructive testing. A complete machine vision system generally includes a lighting source, optical lenses, cameras, and imaging sensors.

[0003] In existing technologies, under low-light detection scenarios, the light intensity output by the light source may be too high, causing the imaging sensor to overexpose in bright areas and lose details in dark areas, resulting in poor image dynamic range. Furthermore, since the surface of the object being measured has varying degrees of reflectivity, especially metallic or glossy surfaces, it can reflect strong light, creating glare or interfering light spots, further exacerbating the aforementioned adverse effects. Therefore, improvements to existing technologies are needed.

[0004] The above information is provided as background information only to aid in understanding this disclosure and does not constitute an assertion or admission that any of the above content can be used as prior art relative to this disclosure. Utility Model Content

[0005] This invention provides a detection light source device and a machine vision system to solve the problems existing in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A detection light source device includes a light source and a multilayer optical film assembly disposed on the light-emitting side of the light source, the optical film assembly comprising, in sequence along the optical path:

[0008] The first transparent film layer used to improve the uniformity of beam illumination;

[0009] A transparent protective film layer used to project light beams and provide structural support;

[0010] Light attenuation film layer used to reduce the illuminance of light beams;

[0011] And a second light-transmitting film layer for further improving the uniformity of beam illumination.

[0012] Optionally, the first light-transmitting film layer includes a light-enhancing film and / or a diffuser plate.

[0013] Optionally, the first light-transmitting film layer includes a first brightness enhancement film, a second brightness enhancement film, and a first diffuser plate sequentially along the light path direction.

[0014] Optionally, the transparent protective film layer is a polycarbonate film.

[0015] Optionally, the transmittance of the light attenuation film layer is 10% to 80%.

[0016] Optionally, the second light-transmitting film layer includes a second diffuser plate.

[0017] Optionally, the detection light source device further includes a base plate, a support frame surrounding the edge of the base plate, and a pressure plate covering the top of the support frame. The base plate, the support frame, and the pressure plate form a receiving space for accommodating the multilayer optical film assembly.

[0018] Optionally, the support frame is formed by connecting multiple side plates end to end;

[0019] The inner sidewalls of each of the side plates are provided with grooves for positioning the multilayer optical film assembly.

[0020] Optionally, the inner side of the side plate is also provided with a pad for supporting the second light-transmitting film layer.

[0021] This invention also provides a machine vision system, including the detection light source device as described in any of the preceding claims.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] This invention provides a detection light source device and machine vision system. By introducing a light attenuation film layer, it can effectively reduce the light intensity in low-light detection scenarios, weaken the intensity of reflected light from the surface of the object being tested, and reduce light spot interference caused by specular reflection, thereby preserving details in dark areas as much as possible and improving the accuracy of image recognition.

[0024] This invention has other features and advantages that will be apparent from or will be set forth in detail in the accompanying drawings and the following detailed description, which together serve to explain the particular principles of this invention. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is an exploded schematic diagram of a detection light source device provided in an embodiment of this utility model;

[0027] Figure 2 This is a schematic diagram of the structure of a detection light source device provided in an embodiment of the present invention from a predetermined viewing angle;

[0028] Figure 3 yes Figure 2 Cross-sectional view at section line AA.

[0029] Reference numerals: 10. Base plate; 11. Lamp plate; 12. Support frame; 121. Side plate; 13. Pressure plate; 14. Pad; 20. Multilayer optical film assembly; 21. First brightness enhancement film; 22. Second brightness enhancement film; 23. First diffuser plate; 24. Transparent protective film layer; 25. Light attenuation film layer; 26. Second diffuser plate; 30. Object under test; 41. Camera; 42. Lens. Detailed Implementation

[0030] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0031] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0032] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0033] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.

[0034] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.

[0035] Unless otherwise specified, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0036] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments in this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0037] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0038] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. For those skilled in the art to which this application pertains, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0039] Please refer to Figure 1 This utility model provides a detection light source device, including a light source and a multilayer optical film assembly 20 disposed on the light-emitting side of the light source.

[0040] The optical film assembly includes, along the optical path direction, a first light-transmitting film layer for improving the uniformity of beam illumination, a transparent protective film layer 24 for projecting the beam and providing structural support, a light attenuation film layer 25 for reducing the beam illumination value, and a second light-transmitting film layer for further improving the uniformity of beam illumination.

[0041] Specifically, the light source is preferably an LED light panel 11, whose light-emitting surface is arranged opposite to the optical film, so that the light passes through each film layer in sequence.

[0042] In this embodiment, the first light-transmitting film layer diffuses or enhances the light beam, making the illuminance distribution more uniform and reducing the occurrence of hot spots and shadows.

[0043] The transparent protective film layer 24 is used to provide mechanical support and protection for the optical film assembly while ensuring light transmission, and to prevent external forces or dust from damaging the internal film layer.

[0044] The light attenuation film 25 is used to precisely reduce the illuminance in the optical path, prevent overexposure in low-illuminance detection environments, and suppress glare reflection from the surface of the object under test 30.

[0045] The second light-transmitting film layer is used to re-homogenize the light beam after light attenuation, making the light distribution on the surface of the object under test 30 more stable and softer, thereby obtaining higher image quality and dynamic range in imaging detection.

[0046] like Figure 2 , 3 As shown, after the light passes through the multi-layer optical film combination 20 to attenuate the illuminance value of the light, the shape features of the object under test 30 enter the lens 42 through the optical path I.

[0047] In one optional embodiment, the first light-transmitting film layer includes a brightness enhancement film and / or a diffuser plate. The brightness enhancement film can improve the brightness and uniformity of the light beam to a certain extent, while the diffuser plate further eliminates light spots through multi-angle scattering, making the illumination of the irradiated area more uniform and stable. Through the combination of the two, the light source can still provide sufficient and uniform illumination under low-light conditions, meeting the requirements of high-quality imaging.

[0048] Specifically, the first light-transmitting film layer also includes a first brightness enhancement film 21, a second brightness enhancement film 22, and a first diffuser plate 23 arranged sequentially along the optical path. The two brightness enhancement films continuously optimize the brightness and light field distribution of the light beam, increasing light intensity and reducing local dark areas. The first diffuser plate 23 then homogenizes the light beam, eliminating local light intensity peaks and achieving a large-area uniform illumination effect. This multi-stage optical processing significantly improves illuminance uniformity within a short optical path, reducing the optical burden on subsequent film layers.

[0049] Understandably, the first light-transmitting film layer may also include more layers of light-enhancing film and more layers of diffusion plates, which can be flexibly adjusted according to actual needs and actual costs.

[0050] The transparent protective film layer 24 is preferably made of polycarbonate film. Polycarbonate film has high light transmittance and impact resistance, and can withstand mechanical pressure and temperature changes while efficiently transmitting light, thus extending the service life of optical components.

[0051] Furthermore, the surface of the polycarbonate film can be treated with anti-scratch or anti-static agents to improve overall durability and optical stability.

[0052] In this embodiment, the transmittance of the light attenuation film layer 25 is preferably between 10% and 80%. By selecting light attenuation films with different transmittance, the intensity of incident light can be flexibly adjusted according to the brightness of the detection environment and the sensitivity of the imaging sensor, avoiding overexposure, preserving details in dark areas, and reducing glare interference caused by metal reflections or bright objects.

[0053] Specifically, the second light-transmitting film layer includes a second diffuser plate 26, which performs final homogenization processing on the light beam at the end of the optical path to ensure consistent illumination on the surface of the object under test, thereby improving the accuracy and stability of the detection. In high-precision imaging applications such as machine vision, this end homogenization processing can significantly reduce detection errors caused by uneven illumination.

[0054] Understandably, the second light-transmitting film layer can also be provided with multiple diffuser plates, aiming to further achieve beam uniformity at the end.

[0055] In another embodiment, the detection light source device further includes a base plate 10, a support frame 12 surrounding the edge of the base plate 10, and a pressure plate 13 covering the top of the support frame 12. A receiving space for accommodating the multilayer optical film assembly 20 is formed between the base plate 10, the support frame 12, and the pressure plate 13. The enclosing structure of the support frame 12 can stably position the film layers, and the pressure plate 13 reliably presses the film layers together, preventing positional displacement due to vibration or external force during use, while also facilitating assembly and maintenance.

[0056] The support frame 12 is composed of multiple side plates 121 connected end to end. The inner wall of each side plate 121 is provided with a groove for positioning the multi-layer optical film assembly 20, so that each film can be accurately aligned during installation and ensure stable and consistent optical path. The modular side plate 121 structure is easy to disassemble and assemble. When replacing or adjusting a single film, there is no need to disassemble the whole structure, which improves maintenance efficiency.

[0057] Furthermore, the inner side of the side plate 121 is also provided with a pad 14 for supporting the second light-transmitting film layer. The pad 14 is used to provide additional support points for the film layer to prevent deformation or sinking during long-term use, and to maintain the stability of the optical path structure and the consistency of the lighting effect.

[0058] Based on the foregoing embodiments, this embodiment also provides a machine vision system, including the detection light source device in the foregoing embodiments, and further including a camera 41 and a lens 42. Figure 2 , 3 As shown, after the light passes through the multi-layer optical film combination 20 to attenuate the illuminance value of the light, the shape features of the object under test 30 enter the lens 42 through the optical path I.

[0059] The detection light source device is used in machine vision systems to provide uniform, soft and controllable illumination for the imaging system in ultra-low light or complex lighting environments, effectively improving recognition accuracy and stability, and reducing the impact of changes in lighting conditions on image quality.

[0060] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of protection of this utility model. Any technical solutions resulting from equivalent structural or procedural substitutions or modifications made based on the essential concept of this application and utilizing the content described in the text and drawings of this application, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of protection of this utility model.

Claims

1. A device for detecting a light source, characterized in that, The light source includes a multilayer optical film assembly (20) disposed on the light-emitting side of the light source, the optical film assembly comprising, in sequence along the optical path: The first transparent film layer used to improve the uniformity of beam illumination; A transparent protective film layer (24) for projecting light beams and providing structural support. Light attenuation film layer (25) used to reduce the illuminance of the beam; And a second light-transmitting film layer for further improving the uniformity of beam illumination.

2. The detection light source device according to claim 1, characterized in that, The first light-transmitting film layer includes a light-enhancing film and / or a diffuser plate.

3. The detection light source device according to claim 2, characterized in that, The first light-transmitting film layer includes a first brightness enhancement film (21), a second brightness enhancement film (22), and a first diffuser plate (23) sequentially along the light path direction.

4. The detection light source device according to claim 1, characterized in that, The transparent protective film layer (24) is a polycarbonate film.

5. The detection light source device according to claim 1, characterized in that, The transmittance of the light attenuation film layer (25) is 10%~80%.

6. The detection light source device according to claim 1, characterized in that, The second light-transmitting film layer includes a second diffuser plate (26).

7. The detection light source apparatus according to any one of claims 1 to 6, characterized in that, It also includes a base plate (10), a support frame (12) surrounding the edge of the base plate (10), and a pressure plate (13) covering the top of the support frame (12). The base plate (10), the support frame (12) and the pressure plate (13) form a receiving space for accommodating the multilayer optical film assembly (20).

8. The detection light source device according to claim 7, characterized in that, The support frame (12) is formed by connecting multiple side plates (121) end to end; Each of the side plates (121) has a groove on its inner sidewall for positioning the multilayer optical film assembly (20).

9. The detection light source device according to claim 8, characterized in that, The inner side of the side plate (121) is also provided with a pad (14) for supporting the second light-transmitting film layer.

10. A machine vision system, characterized in that, Includes the detection light source device as described in any one of claims 1 to 9.

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