A multi-light source combined detection light source
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG HUAZHOU INTELLIGENT EQUIP CO LTD
- Filing Date
- 2025-09-15
- Publication Date
- 2026-06-26
Smart Images
Figure CN224417150U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of light sources, and in particular to a detection light source that combines multiple light sources. Background Technology
[0002] In the field of machine vision inspection technology, the reflectivity of reflective surfaces such as scratches, damage, and burrs poses a significant challenge to the clarity of camera images during precise detection. Therefore, the performance of the supplementary lighting source directly determines the clarity of the captured images and the accuracy of the detection results, making it a core element in ensuring inspection precision.
[0003] Existing technologies typically optimize light sources by increasing their brightness or adjusting their illumination angle. While increasing the brightness can enhance the contrast between the defect area and the background, it can also further intensify the reflection intensity on the glass surface, leading to a decrease in the image signal-to-noise ratio. Adjusting the illumination angle can only reduce reflection locally and cannot achieve full coverage illumination of the object under test. It is easy to create blind spots in the edges and corners of the object under test, making it difficult to fully capture the defect information on the surface of the object under test.
[0004] Therefore, existing supplementary lighting sources still cannot achieve all-around supplementary lighting and cannot provide adequate supplementary lighting for machine vision. Utility Model Content
[0005] In view of the aforementioned problems, this application is made in order to provide a detection light source with a multi-light source combination that overcomes or at least partially solves the aforementioned problems.
[0006] A multi-light source combination detection light source is used to provide a light source for the detection of a reflective test object, including a housing, a coaxial collimated light-emitting area formed inside the housing, and three direct-emitting collimated backlight areas disposed around the coaxial light-emitting area;
[0007] The upper plate of the housing is provided with an imaging hole, and the lower plate of the housing is provided with a first illumination hole coaxial with the imaging hole and a second illumination hole that corresponds one-to-one with the straight collimated backlight area and is coaxial with it; the coaxial collimated light emission area is coaxial with the imaging hole and the first illumination hole, and an inclined beam splitter is provided in the coaxial collimated light emission area;
[0008] When the light source emits light, the light from the coaxial collimated light-emitting area is refracted by the beam splitter and emitted through the first illumination hole, while the light from the three direct-emitting collimated backlight areas is emitted through their respective second illumination holes.
[0009] Preferably, the housing is provided with a set of coaxial light sources constituting the coaxial collimated light emission area. The coaxial light source includes a first lamp plate and a first collimating element, and the first collimating element is coaxially arranged with the first lamp plate.
[0010] Preferably, the housing is provided with three sets of straight backlights that respectively constitute the three straight backlight zones. The straight backlight includes a second lamp board and a second collimator, and the second collimator is coaxially arranged with the second lamp board.
[0011] Preferably, two sets of the straight backlights are symmetrically arranged on both sides of the coaxial collimated light-emitting area, and the other set of the straight backlights is arranged to the side and rear of the coaxial collimated light-emitting area.
[0012] Preferably, the coaxial light source is located to the side and rear of the coaxial collimated light-emitting area, and is perpendicular to the light-emitting direction of a group of straight backlights located on the same side.
[0013] Preferably, heat sinks are respectively provided between the two sets of straight backlights located on both sides of the coaxial collimated light-emitting area and the upper plate.
[0014] Preferably, both the first collimator and the second collimator are Fresnel lenses.
[0015] Preferably, it also includes a power cord, which is electrically connected to the coaxial light source and the direct-emitting backlight, respectively.
[0016] This application has the following advantages:
[0017] In the embodiments of this application, in contrast to the existing technology which still cannot achieve omnidirectional supplementary lighting and cannot effectively supplement light for machine vision, this application provides a solution for multi-angle light emission and light source enhancement using four sets of light sources. Specifically, it includes a housing and a coaxial collimated light emission area formed inside the housing, and three direct-emission collimated backlight areas disposed around the coaxial light emission area. The upper plate of the housing is provided with an imaging hole, and the lower plate of the housing is provided with a first illumination hole coaxial with the imaging hole and a second illumination hole corresponding to and coaxial with each of the direct-emission collimated backlight areas. The coaxial collimated light emission area is coaxial with the imaging hole and the first illumination hole, and an inclined beam splitter is provided within the coaxial collimated light emission area. When the light source emits light, the light from the coaxial collimated light emission area is refracted through the beam splitter and emitted through the first illumination hole, while the light from the three direct-emission collimated backlight areas is emitted through their respective second illumination holes. By using the coaxial light-emitting area and the direct collimation backlight area, not only can it provide all-round supplementary lighting for the object under test, but it can also provide multi-angle supplementary lighting for the lens and camera, so as to better supplement the lighting for machine vision in the microstructure display supplementary lighting detection and detect a more accurate view; by setting a beam splitter in the coaxial collimation light-emitting area, the supplementary lighting effect of the coaxial light source is guaranteed, while blocking strong reflections from directly entering the camera. Attached Figure Description
[0018] To more clearly illustrate the technical solution of this application, the drawings used in the description of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 This is a schematic diagram of the partitioned structure of a detection light source combining multiple light sources according to an embodiment of this application;
[0020] Figure 2 This is a schematic diagram of the structure of a detection light source combining multiple light sources according to an embodiment of this application;
[0021] Figure 3 This is an internal side view of a detection light source combining multiple light sources provided in an embodiment of this application;
[0022] Figure 4 This is an internal front view of a detection light source combining multiple light sources according to an embodiment of this application;
[0023] Figure 5 This is an internal bottom view of a detection light source with a multi-light source combination provided in an embodiment of this application;
[0024] Figure 6 This is an internal top view of a multi-light source combination detection light source provided in an embodiment of this application;
[0025] Figure 7 This is an exploded view of a multi-light source combination detection light source provided in an embodiment of this application;
[0026] Figure 8 This is a schematic diagram of the first illumination of a detection light source combining multiple light sources according to an embodiment of this application;
[0027] Figure 9 This is a schematic diagram of the second illumination of a detection light source with a multi-light source combination provided in an embodiment of this application.
[0028] The reference numerals in the accompanying drawings are as follows:
[0029] 100. Housing; 200. Coaxial collimated light-emitting area; 300. Direct-emitting collimated backlight area; 110. Imaging aperture; 120. First illumination aperture; 130. Second illumination aperture; 140. Coaxial light source; 141. First lamp board; 142. First collimator; 143. Beam splitter; 150. Direct-emitting backlight; 151. Second lamp board; 152. Second collimator; 160. Heat sink; 170. Power cord; 400. Camera; 500. Object under test. Detailed Implementation
[0030] To make the objectives, features, and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0031] The inventors, through analysis of existing technology, discovered that for reflective objects, when light emitted from conventional supplementary lighting sources illuminates the object's surface, a significant amount of light is reflected back directly to the camera lens, creating strong glare interference. Therefore, the light emitted by the source needs to be optimized for highly reflective materials to prevent further light reflection and maintain camera sharpness. To address this, the collimation of the light source needs to be improved.
[0032] The inventors utilized the characteristics of light emission and light rays to design a light source that emits light from multiple angles and improves the collimation requirements of the light source.
[0033] The first step is to mimic optics: Utilizing the application scenario and the lighting requirements of the object being tested, design a multi-source light source. Then, leveraging the properties of light, design several light sources to illuminate the object, thereby enabling the vision camera to capture clearer images. Because the object being tested has strong reflective properties, the light must be collimated.
[0034] The second step is optical design: In order to improve the collimation of the light source, a collimator is installed on the light source to concentrate the light emission, so that more light is concentrated on the object being measured and less light is diffusely reflected from the object being measured.
[0035] The third step is light source design: Based on the supplementary lighting requirements, several light sources are designed to provide multi-angle light to the object being measured and the machine vision, so as to better measure the overall appearance of the object being measured.
[0036] The fourth step is structural design: Based on the light emission requirements, the four light sources are combined together, including one coaxial light source and three direct-emitting backlights, according to their size and light emission method.
[0037] It should be noted that the reflective test objects mainly refer to objects with smooth surfaces such as glass and metal that are prone to specular reflection.
[0038] Reference Figures 1-7 This application illustrates a multi-light source combination detection light source provided in an embodiment of the present application, including a housing, a coaxial collimated light-emitting area 200 formed inside the housing, and three direct-emitting collimated backlight areas 300 disposed around the coaxial light-emitting area;
[0039] The upper plate of the housing 100 is provided with an imaging hole 110, and the lower plate of the housing 100 is provided with a first illumination hole 120 coaxial with the imaging hole 110 and a second illumination hole 130 corresponding to and coaxial with the direct-emitting collimated backlight area 300 respectively; the coaxial collimated light-emitting area 200 is coaxial with the imaging hole 110 and the first illumination hole 120, and an inclined beam splitter 143 is provided in the coaxial collimated light-emitting area 200;
[0040] When the light source emits light, the light from the coaxial collimated light-emitting area 200 is refracted by the beam splitter 143 and emitted through the first illumination hole 120, while the light from the three direct-emitting collimated backlight areas 300 is emitted through the corresponding second illumination hole 130.
[0041] In the embodiments of this application, in contrast to the existing technology which still cannot achieve omnidirectional supplementary lighting and cannot effectively supplement light for machine vision, this application provides a solution for multi-angle illumination and improved light source quality using four sets of light sources. Through the coaxial light-emitting area and the direct-emitting collimated backlight area, not only can omnidirectional supplementary lighting be provided to the object under test, but also multi-angle supplementary lighting can be provided to the lens and camera, resulting in better supplementary lighting for machine vision in microstructure display supplementary lighting detection and more accurate detection. By setting a beam splitter in the coaxial collimated light-emitting area, the supplementary lighting effect of the coaxial light source is ensured, while strong reflected light is blocked from directly entering the camera.
[0042] The following will further describe a detection light source consisting of multiple light sources in various exemplary embodiments of this application.
[0043] It should be noted that multi-angle supplementary lighting is achieved through a combination of a coaxial collimated light-emitting area 200 and three direct-emitting collimated backlight areas 300, solving the problem of blind spots in single-source lighting. The imaging aperture 110 is used to allow light reflected from the object 500 to enter the vision camera 400; the first illumination aperture 120 ensures that the coaxial light perpendicularly illuminates the object 500; the second illumination aperture 130 ensures accurate projection of light from the direct-emitting backlight area; the tilted beam splitter 143 is used to refract the light from the coaxial light source 140 towards the object 500, while allowing the imaging light (non-strong reflection) reflected from the object 500 to be transmitted to the camera 400, thus ensuring the supplementary lighting effect of the coaxial light source 140 and blocking strong reflections from directly entering the camera 400, improving the clarity of the captured image.
[0044] As an example, the housing 100 is composed of an upper plate, a lower plate, a left plate, a right plate, a front plate, and a rear plate. The housing 100 can be made of metal or plastic.
[0045] In one specific implementation, the housing 100 is made of aluminum alloy to enhance heat dissipation. The beam splitter 143 is tilted at 45° within the coaxial collimated light-emitting area 200, with its reflective surface facing the first collimator 142 and its transmissive surface facing the imaging aperture 110. The light from the coaxial collimated light-emitting area 200 is refracted by the beam splitter 143 and then shines perpendicularly onto the object under test 500 through the first illumination aperture 120 on the lower plate. The light from the three direct-emitting collimated backlight areas 300 shines onto the periphery of the object under test 500 through the three second illumination apertures 130 on the lower plate. After being reflected by the object under test 500, the light enters the camera 400 through the imaging aperture 110 on the upper plate, achieving clear imaging without reflection interference.
[0046] In this embodiment, the housing 100 is provided with a set of coaxial light sources 140 that constitute the coaxial collimated light emission area 200. The coaxial light source 140 includes a first lamp plate 141 and a first collimator 142, and the first collimator 142 is coaxially arranged with the first lamp plate 141.
[0047] As an example, the first light panel 141 is the light emission source and can be a PCB light panel; the first collimator 142 is used to collimate the diverging light emitted by the first light panel 141, and is preferably a Fresnel lens.
[0048] In a specific implementation, please refer to Figure 3 Both the first lamp plate 141 and the first collimator 142 are perpendicular to the upper and lower surfaces of the plate, respectively. The first collimator 142 is positioned between the first lamp plate 141 and the beam splitter 143, and the first collimator 142 is set at a 45° angle to the beam splitter 143. The light emitted from the first lamp plate 141 is collimated by the first collimator 142 and then refracted by the beam splitter 143 to form the outgoing light path of the coaxial collimated light-emitting area 200.
[0049] In this embodiment, the housing 100 is provided with three sets of straight backlights 150 that respectively constitute the three straight backlight areas 300. The straight backlight 150 includes a second lamp board 151 and a second collimator 152, and the second collimator 152 is coaxially arranged with the second lamp board 151.
[0050] As an example, the second lamp panel 151 is the light source and can be a PCB lamp panel; the second collimator 152 is used to collimate the diverging light emitted by the second lamp panel 151, and is preferably a Fresnel lens.
[0051] In a specific implementation, please refer to Figure 3 and Figure 4The second lamp plate 151 and the second collimator 152 are both parallel to the upper and lower surfaces of the plate. The second lamp plate 151 is disposed on the upper plate, and the second collimator 152 is disposed on the lower plate and correspondingly disposed to the second illumination hole 130. The light emitted by the second lamp plate 151 is collimated by the second collimator 152 and then emitted through the corresponding second illumination hole 130 to form the output light path of the straight-emitting collimated backlight area 300.
[0052] In this embodiment, two sets of straight backlights 150 are symmetrically arranged on both sides of the coaxial collimated light-emitting area 200, and another set of straight backlights 150 is arranged on the side and rear of the coaxial collimated light-emitting area 200.
[0053] It should be noted that the two sets of direct backlights 150 located on both sides of the coaxial collimated light emission area 200 can ensure that the test object 500 can obtain uniform supplementary light on both sides, avoiding imaging deviation caused by excessive or insufficient light on one side; another set of direct backlights 150 is located on the side and rear of the coaxial collimated light emission area 200 to supplement the light on the side and rear of the test object 500. The three work together to achieve multi-angle supplementary light coverage of the test object 500.
[0054] In a specific implementation, please refer to Figures 4-7 The lower plate has one first illumination hole 120 and three second illumination holes 130, which are respectively located on both sides and the rear side of the first illumination hole 120. Two sets of straight-emitting backlights 150 (two second lamp panels 151 and two second collimators 152) are symmetrically arranged on the left and right sides of the coaxial collimated light-emitting area 200. The two second lamp panels 151 are both located on the upper plate, and the two second collimators 152 are both located on the lower plate, corresponding to the two second illumination holes 130 located on both sides of the first illumination hole 120. Another set of straight-emitting backlights 150 is located on the rear side of the coaxial collimated light-emitting area 200. The second lamp panels 151 of this set are located on the upper plate, and the second collimators 152 are located on the lower plate, corresponding to the second illumination holes 130 located on the rear side of the first illumination hole 120.
[0055] In this embodiment, the coaxial light source 140 is located to the side and rear of the coaxial collimated light emission area 200, and is perpendicular to the light emission direction of a group of straight backlight sources 150 located on the same side. Specifically, the first lamp plate 141 and the first collimator 142 are both located behind the first illumination hole 120, and are perpendicular to the second lamp plate 151 and the second collimator 152, which are also located behind the coaxial collimated light emission area 200.
[0056] In this embodiment, heat sinks 160 are respectively provided between the two sets of straight backlights 150 located on both sides of the coaxial collimated light-emitting area 200 and the upper plate surface. Specifically, the heat sinks 160 can quickly conduct heat to the outside of the housing 100, preventing the lamp board from experiencing a decrease in luminous efficiency or a shortened lifespan due to high temperature, and ensuring stable light source performance.
[0057] As an example, the heat sink 160 can be an aluminum heat sink 160, a copper heat sink 160, a composite heat sink 160 with heat dissipation fins, etc.; the heat sink 160 and the direct-emitting backlight 150 can be bonded together with thermally conductive silicone to enhance the heat dissipation effect.
[0058] In this embodiment, a power cord 170 is also included, which is electrically connected to the coaxial light source 140 and the straight backlight 150, respectively. Specifically, the power cord 170 is used to provide power to the coaxial light source 140 and the straight backlight 150.
[0059] Please refer to the lighting effect. Figure 8 and Figure 9 After the coaxial light source 140 is collimated by the first collimator 142 at the corresponding position, the light reaches the beam splitter 143. The beam splitter 143 refracts the light into the first illumination hole 120, and the object under test 500 is placed below the first illumination hole 120. At the same time, three sets of direct-emitting backlights 150 emit light from the two sides and the rear of the object under test 500, respectively. The light from each set of direct-emitting backlights 150 passes through the corresponding second collimator 152. The second collimator 152 organizes the divergent direct light into highly collimated direct light, which is then emitted from the second illumination hole 130, thus illuminating the sides and back of the object under test 500. The effective imaging light from the surface of the object under test 500 is reflected and propagates upward, penetrates the beam splitter 143, and finally enters the camera lens to complete the image.
[0060] Although preferred embodiments of the present application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present application.
[0061] Finally, it should be noted that in this document, relational 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 such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.
[0062] The above provides a detailed description of a multi-source combined detection light source provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.
Claims
1. A multi-light source combination detection light source, used to provide a light source for detecting reflective test objects, characterized in that, It includes a housing, a coaxial collimated light-emitting area formed inside the housing, and three straight-emitting collimated backlight areas disposed around the coaxial light-emitting area; The upper plate of the housing is provided with an imaging hole, and the lower plate of the housing is provided with a first illumination hole coaxial with the imaging hole and a second illumination hole that corresponds one-to-one with the straight collimated backlight area and is coaxial with it; the coaxial collimated light emission area is coaxial with the imaging hole and the first illumination hole, and an inclined beam splitter is provided in the coaxial collimated light emission area; When the light source emits light, the light from the coaxial collimated light-emitting area is refracted by the beam splitter and emitted through the first illumination hole, while the light from the three direct-emitting collimated backlight areas is emitted through their respective second illumination holes.
2. The detection light source of the multi-light source combination according to claim 1, characterized in that, The housing contains a set of coaxial light sources that constitute the coaxial collimated light emission area. The coaxial light source includes a first lamp board and a first collimator, and the first collimator is coaxially arranged with the first lamp board.
3. The detection light source of the multi-light source combination according to claim 2, characterized in that, The housing contains three sets of straight backlights that respectively constitute the three straight backlight zones. Each straight backlight includes a second lamp board and a second collimator, with the second collimator and the second lamp board being coaxially arranged.
4. The detection light source of the multi-light source combination according to claim 3, characterized in that, Two sets of the straight backlights are symmetrically arranged on both sides of the coaxial collimated light-emitting area, and the other set of the straight backlights is arranged to the side and rear of the coaxial collimated light-emitting area.
5. The detection light source of the multi-light source combination according to claim 4, characterized in that, The coaxial light source is located to the side and rear of the coaxial collimated light-emitting area, and is perpendicular to the light-emitting direction of a group of straight backlights located on the same side.
6. The detection light source of the multi-light source combination according to claim 4, characterized in that, Heat sinks are respectively provided between the two sets of straight backlights located on both sides of the coaxial collimated light-emitting area and the upper plate.
7. The detection light source of the multi-light source combination according to claim 3, characterized in that, Both the first collimator and the second collimator are Fresnel lenses.
8. The detection light source of the multi-light source combination according to claim 3, characterized in that, It also includes a power cord, which is electrically connected to the coaxial light source and the direct-emitting backlight, respectively.