Diffuse reflection wide-angle three-dimensional light source and lighting device

Abstract

The utility model provides a diffuse reflection wide-angle three-dimensional light source which comprises a spherical-crown-shaped frame body, a scattering light cover and a plurality of forward LED light source channels which are arranged on the inner spherical surface of the frame body and are regularly distributed around the center of the frame body, and the forward LED light source channels are electrically connected with an external controller through electric connection terminals. Light emitted by the forward LED light source channel is scattered by the light scattering cover and then is emitted to the outside. According to the diffuse reflection wide-angle three-dimensional light source provided by the utility model, the uniformity of the light source is greatly improved, the cost is saved, and the lighting uniformity of the light source is higher through the design of the hemispherical spherical crown and the diffuse reflection lighting mode; in addition, independent control is carried out through the controller, multiple lighting modes can be integrated, more application scenes can be adapted, the light source does not need to be replaced frequently, the maintenance and replacement cost of equipment is greatly reduced, and then enterprise time and labor cost are saved.

Description

Technical Field

[0001] The utility model relates to the technical field of LED lighting lamps, and in particular to a diffuse reflection wide-angle stereoscopic light source and a lighting device. Background Art

[0002] As a key component of the machine vision system, visual inspection light sources require uniform and diffuse light sources. Nowadays, visual inspection light sources have made significant progress in design and manufacturing. Light sources of various shapes, materials, and light-emitting methods have been developed to adapt to visual inspection tasks in different scenarios and needs. For example, common light source types such as arc, ring, dome light sources, four-sided light sources and backlighting can better highlight the three-dimensional information of objects and solve the problem of diagonal illumination shadows by providing different illumination angles and color combinations. However, although visual inspection light source technology has made significant progress, it still faces some challenges, such as the uniformity of light sources, cost control and other aspects that still need to be further improved. Utility Model Content

[0003] The main purpose of the utility model is to provide a diffuse reflection wide-angle stereo light source and a lighting device to solve the above technical problems.

[0004] To achieve the above-mentioned purpose, the utility model provides a diffuse reflection wide-angle stereoscopic light source, including a spherical crown-shaped frame, a scattering light cover, and a plurality of forward LED light source channels arranged on the inner spherical surface of the frame and regularly distributed around the center of the frame, the forward LED light source channel being electrically connected to an external controller through an electrical connection terminal; the light emitted by the forward LED light source channel is scattered by the scattering light cover and then emitted to the outside.

[0005] Preferably, a camera hole is provided in the middle of the frame for allowing an image acquisition camera to acquire images.

[0006] Preferably, the plurality of forward LED light source channels form a multi-layer light source ring arranged around the center of the frame.

[0007] Preferably, the number of forward LED light source channels in the light source ring close to the center in the multi-layer light source ring is greater than the number of LEDs in the forward LED light source channels far from the center.

[0008] Preferably, the number of forward LED light source channels of the first light source ring close to the center is 8, the number of forward LED light source channels of the second light source ring far from the center is 4, and the number of forward LED light source channels of the third light source ring located between the first light source ring and the second light source ring is 8.

[0009] Preferably, the number of the first light source rings is 5, the number of the second light source rings is 2, and the number of the third light source ring is 1; wherein the forward LED light source channels in the first light source ring are arranged adjacent to each other; and the forward LED light source channels in the second light source ring and the third light source ring are arranged at intervals.

[0010] Preferably, a mounting groove protrudes inwardly from the outer edge of the frame, and a plurality of reverse LED light source channels are arranged in the mounting groove, and the light emitting directions of the reverse LED light source channels are toward the inner spherical surface of the frame.

[0011] Preferably, the number of the reverse LED light source channels is 8.

[0012] Preferably, the frame is made of aluminum alloy.

[0013] The utility model also provides a lighting device, comprising a controller and a diffusely reflecting wide-angle stereoscopic light source as described in any one of the above items, wherein the controller independently controls the on and off of each LED in the forward LED light source channel and / or the reverse LED light source channel through the electrical connection terminal.

[0014] The diffuse reflection wide-angle stereo light source provided by the utility model greatly improves the uniformity of the light source and saves costs. The design of the hemispherical crown and the diffuse reflection lighting method make the lighting uniformity of the light source higher. In addition, independent control through the controller can integrate multiple lighting methods into one, which can adapt to more application scenarios. There is no need to frequently replace the light source, which greatly reduces the maintenance and replacement costs of the equipment, thereby saving the company time and labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation on the present invention. Obviously, the accompanying drawings described below are only some embodiments. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work. In the accompanying drawings:

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of a diffuse reflection wide-angle three-dimensional light source in one embodiment of the utility model.

[0017] Figure 2 for Figure 1 Left view of a medium diffuse wide-angle stereo light source.

[0018] Figure 3 for Figure 1 Rear view of a medium diffuse wide-angle stereo light source.

[0019] Figure 4It is a schematic diagram of the light source structure of a diffuse reflection wide-angle stereo light source in one embodiment of the utility model.

[0020] Figure 5 It is a schematic diagram of the optical path structure of a diffuse reflection wide-angle stereo light source in one embodiment of the utility model.

[0021] Figure 6 It is a schematic diagram of the light source layout of a diffuse reflection wide-angle stereo light source in one embodiment of the utility model.

[0022] Figure 7 It is a schematic diagram of a usage scenario of a diffuse reflection wide-angle stereo light source in one embodiment of the utility model.

[0023] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0024] The following is a clear and complete description of the technical problems solved by the embodiments of the utility model, the technical solutions adopted, and the technical effects achieved in combination with the accompanying drawings and specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other equivalent or obviously modified embodiments obtained by ordinary technicians in this field without creative work fall within the scope of protection of the utility model. The embodiments of the utility model can be concretized in a variety of different ways as defined and covered in the claims.

[0025] It should be noted that in the following description, many specific details are given for ease of understanding, but it is obvious that the present invention can be implemented without these specific details.

[0026] It should be noted that, in the absence of clear limitation or conflict, the various embodiments of the present invention and the technical features therein can be combined with each other to form a technical solution.

[0027] Please combine Figure 1-4 The utility model proposes a diffuse reflection wide-angle stereo light source, including a spherical crown-shaped frame 3, a plurality of forward LED light source channels 4 arranged on the inner spherical surface of the frame 3 and regularly distributed around the center of the frame, the forward LED light source channels 4 are electrically connected to an external controller through an electrical connection terminal 9 and are controlled by the external controller; a scattering light cover 5 is provided on the light-emitting surface of the forward LED light source channel 4.

[0028] Specifically, the plurality of forward LED light source channels 4 regularly distributed around the center of the frame means that the forward LED light source channels 4 are symmetrical, radially or array-distributed relative to the center, rather than randomly distributed.

[0029] Specifically, the scattering light cover 5 can also be set to a spherical shape to adapt to and fit the inner surface (inner spherical surface) of the frame 3. The scattering light cover 5 can diffuse the light projected from the forward LED light source channel 4. At the same time, since the inner and outer surfaces of the scattering light cover 5 have a scattering effect, the light projected from the forward LED light source channel 4 can be scattered, and the light irradiating the outer surface of the scattering light cover 5 can be diffusely reflected, thereby achieving a uniform diffuse reflection effect.

[0030] The scattering light cover 5 can also be set to be a plane, a bulb shape protruding in the light emitting direction, or other shapes.

[0031] The diffuse reflection wide-angle stereo light source provided by the utility model greatly improves the uniformity of the light source and saves costs. The design of the hemispherical ball crown and the diffuse reflection lighting method make the lighting uniformity of the light source higher.

[0032] In addition, diffuse lighting has the following advantages:

[0033] Reduce reflections and glare: In direct light, reflections on the surface of an object may cause visual illusions or distortions. Diffuse reflection reduces reflections on the surface of an object by scattering light, reducing contrast and thus reducing the impact of glare on the camera. This means that the camera does not need to frequently adjust the focal length when detecting an object, improving detection efficiency.

[0034] Improve photo clarity and detail: In visual inspection, diffuse reflection can reduce light reflection and glare, thereby improving the clarity and detail of photos. This lighting method helps the camera capture the true details and colors of objects, making photos more vivid and realistic.

[0035] Preferably, a camera hole 2 is provided in the middle of the frame 3 for image acquisition by the image acquisition camera 1. When the diffuse reflection wide-angle stereo light source is used as a visual detection light source for a machine vision system, the camera is usually located behind the diffuse reflection wide-angle stereo light source, and the camera hole 2 is provided to cooperate with the use of the corresponding camera 1.

[0036] Furthermore, the camera hole 2 may be provided with a pluggable plug 10, and when the camera hole 2 is not needed, the camera hole 2 may be plugged to prevent light leakage.

[0037] Preferably, the plurality of forward LED light source channels 4 form a multi-layer light source ring disposed around the center of the frame 3. By disposing the multi-layer light source ring, the overall size of the diffuse reflection wide-angle stereoscopic light source can be increased.

[0038] Increasing the size of the light source has the following advantages:

[0039] More uniform lighting: As the overall size of the diffuse wide-angle stereo light source increases, its surface area also increases, and the number of lamp beads arranged inside increases, which helps the light source emit more light and distribute it more evenly in the space. A larger light source surface area means that the light can be scattered more widely, thereby reducing shadows and areas of uneven lighting, providing a softer and more uniform lighting effect.

[0040] Larger illumination range: Larger light source size provides a wider range of lighting angles, reducing the need to use multiple small light sources, thereby simplifying the design and installation of lighting systems.

[0041] Better heat dissipation: Heat dissipation is a key consideration for any light source. As light sources get larger, their surface area increases, which helps to dissipate the generated heat more efficiently. Good heat dissipation can extend the life of the light source and reduce the risk of performance degradation or damage due to overheating.

[0042] The following is an explanation of the optical principle of a spherical crown (also called a hemispherical) light source of a diffusely reflecting wide-angle stereoscopic light source:

[0043] The hemispherical light source can produce uniform and soft light because the light is diffusely reflected on the inner surface of the hemispherical shape, so that the light can be evenly distributed. At the same time, the design of the camera hole enables the camera to receive the light that is illuminated and reflected by the light source. These lights carry information such as the shape, texture and color of the object being inspected. When these lights pass through the camera lens, an image of the object is formed on the camera's photosensitive element. In addition, the size and position of the camera hole also need to be optimized according to the actual application scenario. A camera hole that is too large may allow too much external light to enter and interfere with the image quality; while a camera hole that is too small may limit the camera's field of view or cause image distortion. Therefore, in the design process, it is necessary to comprehensively consider the characteristics of the light source, camera and object being inspected to achieve the best visual inspection effect.

[0044] The design of the hemispherical light source allows the light to be evenly distributed on the surface of the inspected object, thereby improving the quality and contrast of the image. This uniform lighting helps to eliminate shadows and reflections, making the edges and details of the object clearer. By opening a circular camera hole in the middle of the hemispherical light source, it can be ensured that the camera lens only receives light that is illuminated and reflected by the light source, thereby reducing the impact of external light sources or other interference factors on image quality. The design of the camera hole allows the camera to maintain a suitable distance and angle with the inspected object, thereby ensuring the accuracy and clarity of the image.

[0045] The light source adopts a hemispherical diffuse reflection design. The principle lies in its special hemispherical design and surface characteristics. The light emitted by the light source is reflected multiple times on the inner wall of the hemispherical shape, forming a diffuse reflection effect. This diffuse reflection allows the light to be scattered evenly in all directions, thus avoiding the strong contrast and shadows that may be caused by direct light. At the same time, due to the hemispherical design, the light source has a wider illumination range and can provide uniform lighting over a larger area.

[0046] The light source adopts a hemispherical diffuse reflection design and plays an important role in visual inspection. First, it can provide uniform and soft lighting, making the surface details and features of the inspected object clearer. This uniform lighting helps to eliminate shadows and reflections, and improve the contrast and clarity of the image. Secondly, the diffuse hemispherical light source is suitable for inspecting objects with curved, shiny or uneven surfaces. Due to its diffuse reflection characteristics, the light source can fully illuminate these complex surfaces, making defects, flaws or features easier to identify and detect.

[0047] Preferably, the number of forward LED light source channels 4 in the light source ring close to the center among the multi-layer light source rings is greater than the number of forward LED light source channels 4 in the light source ring far from the center.

[0048] Preferably, in a specific example of the present invention, the number of forward LED light source channels 4 of the first light source ring close to the center is 8, and the number of forward LED light source channels 4 of the second light source ring far from the center is 4.

[0049] Preferably, the number of the first light source rings (the light source ring formed by light source channels No. 9-48) is 5, and the number of the second light source rings (the light source ring formed by light source channels No. 1-8) is 2.

[0050] The forward LED light source channels in the first light source ring are arranged adjacently or at intervals; and the forward LED light source channels in the second light source ring are arranged at intervals.

[0051] Preferably, in this embodiment, the forward LED light source channels (17-48) of the light source ring close to the center in the first light source ring are arranged adjacently, and the forward LED light source channels (9-16) of the light source ring relatively far from the center are arranged at intervals.

[0052] Those skilled in the art should know that the number of the forward LED light source channels 4 can be designed according to the overall size and usage scenario of the diffuse reflection wide-angle stereoscopic light source.

[0053] Preferably, the outer edge of the frame 3 protrudes inwardly to form a mounting groove 91, and a plurality of reverse LED light source channels 6 are arranged in the mounting groove 91, and the light emitting direction of the reverse LED light source channels 6 is toward the inner spherical surface of the frame 3. The mounting groove 91 is arranged around the frame 3, and the light emitting direction of the reverse LED light source channels 6 can be toward the center of the frame 3, or other positions of the inner spherical surface, such as the midpoint between the center and the edge.

[0054] Preferably, the reverse LED light source channels 6 form at least one third light source ring. Specifically, in the present embodiment, the reverse LED light source channels 6 form a third light source ring, and the number of the reverse LED light source channels 6 may be 8. The reverse LED light source channels in the third light source ring may be arranged adjacently or at intervals. In the present embodiment, the reverse LED light source channels in the third light source ring are arranged adjacently.

[0055] Preferably, the shape of the third light source ring can be adapted to the shape of the frame 3 and may not necessarily be a circular ring. For example, in this embodiment, the third light source ring is in a four-leaf clover shape according to the shape of the frame 3.

[0056] Please refer to Figure 5 , 5a is a schematic diagram of the effect of only forward LED light source channel 4 emitting light. The forward LED light source channel 4 directly emits light evenly distributed on the inner wall of the frame 3, so that the light emitted by the light-emitting channel is relatively evenly arranged. With the light-homogenizing diffuser 4, the light can be evenly diffused, and the detected object can receive light from all directions without shadows. The light information of the detected object at all angles can be transmitted to the camera. 5b is a schematic diagram of only reverse LED light source channel 6 emitting light. The reverse LED light source channel 6 is evenly distributed on the outer ring of the aluminum alloy frame, so that the light emitted by the light-emitting channel is evenly irradiated on the surface of the light-homogenizing diffuser. The surface of the light-homogenizing diffuser is a fine irregular rough surface, which can diffusely reflect light in all directions. The detected object can receive light from all directions more evenly, and the lighting effect is better. There is no direct light, only uniform diffused light, which helps to eliminate shadows and reflections. The light information of the detected object at all angles is more evenly transmitted to the camera without omission. It can be understood that the forward LED light source channel 4 and the reverse LED light source channel 6 can also emit light at the same time. The above is only an explanation of the light path effect of LED light source channels in different directions.

[0057] Please refer to Figure 6 In this embodiment, 56 light-emitting channels (forward LED light source channel 4) are taken as an example to illustrate the editable light source characteristics of the diffuse reflection wide-angle stereo light source. Among them, light sources 49-56 are reverse LED light source channels 6, and light sources 1-48 are forward LED light source channels 4.

[0058] The utility model adopts the design of light source ring. By setting multiple light source rings (for example, 7 light source rings are set for 56 light channels), each light source ring illuminates the object to be detected at a different longitudinal lighting angle, so that the information in each longitudinal direction can be read more comprehensively; the light source ring is arranged in a ring so that the distance from each light channel on the light source ring to the object to be detected is consistent, making the lighting more uniform. If the actual application scenario only needs to read information in a certain direction, such as Figure 7 In different modes, only one or several light source rings can be lit, such as in visual defect detection. By evenly arranging several light channels on each light source ring, the light channels on each light source ring illuminate the object to be detected at different lateral lighting angles, and information in each lateral direction can be read. The on / off and brightness of each light channel can be controlled by software according to the actual application scenario.

[0059] Those skilled in the art should know that the number and arrangement of the above-mentioned light source rings, forward LED light source channels 4, and reverse LED light source channels 6 can be set as needed, and will not be described in detail here.

[0060] The utility model also provides a lighting device, comprising a controller and a diffuse reflection wide-angle stereoscopic light source as described in any one of the above items, wherein the controller independently controls the on / off and brightness of each LED in the forward LED light source channel and / or the reverse LED light source channel through the electrical connection terminal. Here, the on / off and brightness control of each LED is realized by programming the controller, which can be directly realized by those skilled in the art and will not be repeated here.

[0061] Please combine Figure 7 , the light sources (17, 18, 23, 24, 25, 26, 31, 32) in the black part shown in 7a are lit up and can be used to replace the arc light source; the light source in the black part shown in 7b is lit up and can be used to replace the ring light source; the light source in the black part shown in 7c is lit up and can be used to replace the four-sided light source; the light source in the black part shown in 7d is lit up and can be used to replace the dome light source; the light source in the black part shown in 7e is lit up and can be used to replace the diffuse reflection light source.

[0062] The utility model can integrate a variety of lighting methods into one through independent control of the controller, can adapt to more application scenarios, does not need to frequently replace light sources, greatly reduces the maintenance and replacement costs of equipment, and thus saves enterprise time and labor costs.

[0063] Preferably, the frame is made of aluminum alloy, which serves as a structural support for the light source and has good thermal conductivity and heat dissipation properties, and conducts and diffuses the heat of the light-emitting channel to the outside.

[0064] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. A diffuse reflection wide-angle stereo light source, characterized in that: It includes a spherical crown-shaped frame, a scattering light cover, and a plurality of forward LED light source channels arranged on the inner spherical surface of the frame and regularly distributed around the center of the frame. The forward LED light source channels are electrically connected to an external controller through electrical connection terminals; the light emitted by the forward LED light source channels is scattered by the scattering light cover and then emitted to the outside.

2. The diffuse reflection wide-angle stereo light source according to claim 1, characterized in that: A camera hole is provided in the middle of the frame for allowing an image acquisition camera to acquire images.

3. The diffuse reflection wide-angle stereo light source according to claim 1, characterized in that: The plurality of forward LED light source channels form a multi-layer light source ring disposed around the center of the frame.

4. The diffuse reflection wide-angle stereo light source according to claim 3, characterized in that: The number of forward LED light source channels in the light source ring close to the center of the multi-layer light source ring is greater than the number of LEDs in the forward LED light source channels far from the center.

5. The diffuse reflection wide-angle stereo light source according to claim 4, characterized in that: The number of forward LED light source channels of the first light source ring close to the center is 8, and the number of forward LED light source channels of the second light source ring far from the center is 4.

6. The diffuse reflection wide-angle stereo light source according to claim 5, characterized in that: The number of the first light source rings is 5, and the number of the second light source rings is 2; wherein the forward LED light source channels in the first light source rings are arranged adjacently or at intervals; and the forward LED light source channels in the second light source rings are arranged at intervals.

7. The diffuse reflection wide-angle stereo light source according to claim 1, characterized in that: The outer edge of the frame body protrudes inwardly to form a mounting groove, and a plurality of reverse LED light source channels are arranged in the mounting groove. The light emitting directions of the reverse LED light source channels are toward the inner spherical surface of the frame body; the plurality of reverse LED light source channels form at least one third light source ring.

8. The diffuse reflection wide-angle stereo light source according to claim 7, characterized in that: The number of the third light source ring is 1, and the number of the reverse LED light source channels is 8.

9. The diffuse reflection wide-angle stereo light source according to claim 1, characterized in that: The frame is made of aluminum alloy.

10. A lighting device, characterized in that: It comprises a controller and a diffusely reflecting wide-angle stereoscopic light source as described in any one of claims 1 to 9, wherein the controller independently controls the on / off and brightness of each of the forward LED light source channels and / or the reverse LED light source channels through the electrical connection terminals.

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