Combined light source and visual inspection device

Abstract

The utility model discloses a combined light source and a visual inspection device. The combined light source comprises a coaxial light source, an annular light source and a polarizer, a detection window and a light outlet are respectively formed in two axial ends of the coaxial light source and are opposite to each other; the annular light source is connected to the light outlet side of the coaxial light source, and a center hole of the annular light source is opposite to the light outlet so as to allow light emitted by the coaxial light source to pass through; the polarizer is connected to the light emitting side of the annular light source and is coaxial with the coaxial light source and the annular light source. The combined light source provided by the utility model not only can effectively reduce shadows generated in the lighting process of the to-be-detected product, but also is favorable for distinguishing the chamfered surface of the product from other surfaces, and can effectively improve the accuracy of a detection result.

Description

Technical Field

[0001] This utility model relates to the field of optical inspection technology, and in particular to a combined light source and a visual inspection device having the same. Background Technology

[0002] When a vision inspection module inspects the appearance quality of a product, it needs to illuminate the product with a light source. Illumination is a crucial factor affecting the input of the machine vision system, directly impacting the quality of the input data and the application's effectiveness. In related technologies, a combination of coaxial and ring light sources is used to illuminate the product under machine vision inspection. While this combination can provide illumination from different angles to reduce shadows, it still struggles to distinguish the chamfered surfaces from other surfaces, especially for products with highly reflective chamfers, thus affecting the accuracy of the inspection results. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a combined light source, which not only effectively reduces shadows generated during the illumination of the product under inspection, but also facilitates the differentiation of the product's chamfered surface from other surfaces, thereby effectively improving the accuracy of the inspection results.

[0004] This invention also provides a visual inspection device having the above-mentioned combined light source.

[0005] According to a first aspect of the present invention, the combined light source includes a coaxial light source, a ring light source, and a polarizing mirror; the coaxial light source has a detection window and a light emission port formed at both ends of its axial direction, and the detection window and the light emission port are opposite to each other; the ring light source is connected to the light emission side of the coaxial light source, and the central hole of the ring light source is opposite to the light emission port, so as to allow the light emitted by the coaxial light source to pass through; the polarizing mirror is connected to the light emission side of the ring light source and is coaxially arranged with the coaxial light source and the ring light source.

[0006] The combined light source according to the first aspect of the present invention has at least the following beneficial effects:

[0007] The combined light source in this embodiment can illuminate the product under test at different angles using a coaxial light source and a ring light source, thereby effectively reducing illumination shadows. At the same time, the polarizing mirrors located on the light-emitting sides of the coaxial light source and the ring light source can effectively filter the reflected light from the chamfered surface of the product under test. After the filtered reflected light enters the vision inspection module through the polarizing mirror and the inspection window, the vision inspection module can more easily distinguish the chamfered surface of the product under test from other surfaces, thereby improving the accuracy of the inspection results.

[0008] According to some embodiments of the first aspect of this utility model, the combined light source has an angle of 25° or more between the light emission direction of the ring light source and the axis of the ring light source.

[0009] According to some embodiments of the first aspect of this utility model, the combined light source, the coaxial light source and the ring light source are detachably connected.

[0010] According to some embodiments of the first aspect of the present invention, the combined light source has a connecting bracket detachably attached to the side of the annular light source near the coaxial light source. Two connecting brackets are provided and are located on opposite sides of the central hole. The coaxial light source is disposed between the two connecting brackets and is detachably connected to the two connecting brackets.

[0011] According to some embodiments of the first aspect of the present invention, the combined light source includes a connecting bracket comprising an upright plate and a base plate connected to each other. The base plate is connected to and attached to one axial end of the annular light source by fasteners. The upright plate is perpendicular to the base plate and attached to one end of the coaxial light source in the width direction. The coaxial light source is detachably connected to the upright plate by fasteners.

[0012] According to some embodiments of the first aspect of this utility model, the combined light source includes a polarizing mirror and a ring light source that are detachably connected.

[0013] According to some embodiments of the first aspect of the present invention, in the combined light source, a fixed ring is sleeved on the side of the annular light source near the polarizer, and the polarizer is threadedly connected to the inner side of the fixed ring.

[0014] According to some embodiments of the first aspect of the present invention, a fixed ring is connected to the peripheral side of the annular light source by a fastener, and an annular boss is provided on the inner side of the fixed ring near the polarizing mirror. The annular boss abuts against the end of the annular light source near the polarizing mirror and is provided with an internal thread for connecting the polarizing mirror.

[0015] A visual inspection device according to some embodiments of the second aspect of the present invention includes the combined light source described in the first aspect embodiment.

[0016] The visual inspection device according to some embodiments of the second aspect of the present invention has at least the following beneficial effects:

[0017] The visual inspection device of this embodiment, by employing the combined light source of the first aspect embodiment described above, can more easily distinguish the chamfered surface of the product to be inspected from the other surfaces, thereby improving the accuracy of the inspection results.

[0018] According to some embodiments of the second aspect of the present invention, the visual inspection device further includes a visual inspection module, wherein the light receiving end of the visual inspection module is located on the side of the coaxial light source away from the ring light source, and the light receiving end of the visual inspection module is opposite to the inspection window.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0021] Figure 1 This is a schematic diagram of the structure of a combined light source according to an embodiment of the present invention;

[0022] Figure 2 for Figure 1 Top view of the combined light source shown;

[0023] Figure 3 for Figure 1 An exploded view of the combined light source shown;

[0024] Figure 4 for Figure 2 A cross-sectional view of the combined light source shown in the AA direction;

[0025] Figure 5 This is a schematic diagram of the structure of a visual inspection device according to an embodiment of the present invention.

[0026] Figure label:

[0027] Coaxial light source 10; square box 11; detection window 111; light outlet 112; first connection hole 113; rectangular lamp plate 12; diffuser plate 13; semi-transparent mirror 14;

[0028] Ring light source 20; central hole 201; circular housing 21; receiving cavity 211; third connecting hole 212; sixth connecting hole 213; lampshade 22; conical lamp plate 23;

[0029] Polarizing mirror 30;

[0030] Connecting bracket 40; upright plate 41; second connecting hole 411; base plate 42; fourth connecting hole 421;

[0031] 50; 51; 52; fifth connecting hole;

[0032] Combined light source 100; camera 200. Detailed Implementation

[0033] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0034] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, left, right, front, and back, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0035] In the description of this utility model, the use of "first" and "second" is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features or the order of the technical features.

[0036] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0037] The following is for reference only. Figure 1 To be continued Figure 4 This invention describes a combined light source 100 according to a first aspect embodiment of the present invention. The combined light source 100 of the first aspect embodiment is applied to a vision inspection device and is used to illuminate a product during the vision inspection process.

[0038] Reference Figures 1 to 4According to some embodiments of the present invention, the combined light source 100 includes a coaxial light source 10, a ring light source 20, and a polarizing mirror 30. The coaxial light source 10 has a detection window 111 and a light outlet 112 formed at both ends of its axial direction. The detection window 111 and the light outlet 112 are opposite to each other. The light outlet 112 of the coaxial light source 10 is used to emit light generated by the coaxial light source 10, while the detection window 111 is used to transmit light reflected back from the light outlet 112. The light receiving end in the vision detection module is directly facing and toward the detection window 111, so that the reflected light emitted through the detection window 111 can be received by the vision detection module. The ring light source 20 is connected to the light-emitting side of the coaxial light source 10, and the central aperture 201 of the ring light source 20 is opposite to the light-emitting port 112 to allow light emitted from the coaxial light source 10 to pass through. The central aperture 201 also allows reflected light to pass through in the opposite direction. The ring light source 20 is used to provide light at a different illumination angle than the coaxial light source 10 to reduce shadows generated during the illumination of the product to be inspected. The polarizing mirror 30 is connected to the light-emitting side of the ring light source 20 and is coaxially arranged with the coaxial light source 10 and the ring light source 20. The polarizing mirror 30 can convert the light emitted by the coaxial light source 10 and the ring light source 20 into polarized light. After the polarized light is reflected by the highly reflective chamfered surface of the product, the polarization angle will change. As a result, when the light reflected by the highly reflective chamfered surface is reflected back to the polarizing mirror 30, it will not be able to pass through the polarizing mirror 30 and will be filtered out. The reflected light from the other surfaces of the product to be inspected can pass through the polarizing mirror 30 normally, and then sequentially illuminate the light receiving end in the vision inspection module through the central hole 201, the light outlet 112 and the inspection window 111.

[0039] It should be understood that the combined light source 100 of this embodiment can not only provide different illumination angles to the product to be tested through the coaxial light source 10 and the ring light source 20, thereby effectively reducing illumination shadows, but also effectively filter the reflected light reflected from the chamfered surface of the product to be tested through the polarizing mirror 30 located on the light-emitting side of the coaxial light source 10 and the ring light source 20. After the filtered reflected light enters the vision inspection module through the polarizing mirror 30 and the detection window 111, the vision inspection module can more easily distinguish the chamfered surface of the product to be tested from other surfaces, thereby improving the accuracy of the inspection results.

[0040] It is understood that in some embodiments, the angle between the light emission direction of the ring light source 20 and its axial direction is greater than 25°. Since the illumination direction of the coaxial light source 10 is the same as the axial direction of the ring light source 20, by setting the light emission direction of the ring light source 20 to have an angle of greater than 25° with its axial direction, the angle between the illumination direction of the ring light source 20 on the product to be tested and the illumination direction of the coaxial light source 10 on the product can also be greater than 25°, thus further reducing shadows on the product. For example, refer to... Figure 4 In one embodiment, the angle between the light emission direction of the ring light source 20 and the axial direction of the ring light source 20 is 30°, that is, the angle between the illumination direction of the ring light source 20 and the illumination direction of the coaxial light source 10 is 30°.

[0041] It is understood that in some embodiments, the coaxial light source 10 and the ring light source 20 are detachably connected to facilitate targeted replacement in the event of damage to either the coaxial light source 10 or the ring light source 20. For example, in one embodiment, for convenient connection of the coaxial light source 10, refer to... Figure 1 and Figure 3 The annular light source 20 has a detachable connecting bracket 40 on the side near the coaxial light source 10. Two connecting brackets 40 are provided, located on opposite sides of the central hole 201. The coaxial light source 10 is positioned between the two connecting brackets 40 and detachably connected to them. Specifically, the connecting bracket 40 includes an interconnected vertical plate 41 and a bottom plate 42. The bottom plate 42 is connected to and adheres to one axial end of the annular light source 20 via fasteners. The vertical plate 41 is perpendicular to the bottom plate 42 and adheres to one end of the coaxial light source 10 in the width direction. The coaxial light source 10 is detachably connected to the vertical plate 41 via fasteners. Thus, by removing the fasteners on the vertical plate 41, the coaxial light source 10 can be removed from the connecting bracket 40 for replacement. Similarly, by removing the fasteners on the bottom plate 42, the annular light source 20 can be removed from the connecting bracket 40 for replacement.

[0042] Furthermore, referring to Figure 4 The coaxial light source 10 includes a square box 11, a rectangular lamp plate 12, a diffuser plate 13, and a semi-transparent lens 14. The detection window 111 and the light outlet 112 are both located on the square box 11, while the rectangular lamp plate 12, the diffuser plate 13, and the semi-transparent lens 14 are all located inside the square box 11. The semi-transparent lens 14 is installed inside the square box 11 at a 45° angle to the axis of the coaxial light source 10 and is located between the detection window 111 and the light outlet 112. The rectangular lamp plate 12 is installed on the inner wall of the square box 11 and is located on the side of the diffuser plate 13 away from the semi-transparent lens 14, so that the light from the rectangular lamp plate 12 is diffused by the diffuser plate 13 and then illuminates the semi-transparent lens 14. After being reflected by the semi-transparent lens 14, the light is emitted from the light outlet 112 along the axis of the coaxial light source 10. The square box 11 has a first connecting hole 113 on its two side plates in the width direction, and a second connecting hole 411 opposite to the first connecting hole 113 on the upright plate 41. The coaxial light source 10 can be detachably connected to the upright plate 41 by fasteners passing through the second connecting hole 411 and the first connecting hole 113.

[0043] Similarly, refer to Figure 4The ring light source 20 includes a circular housing 21, a conical lamp plate 23, and a lampshade 22. The circular housing 21 forms a receiving cavity 211 with an opening on one side. The lampshade 22 closes the opening of the receiving cavity 211. The conical lamp plate 23 is installed inside the receiving cavity 211. A central hole 201 is provided on the lampshade 22 and the circular housing 21. The light emitted by the conical lamp plate 23 is perpendicular to the conical surface of the conical lamp plate 23 and shines on the polarizing mirror 30 after passing through the lampshade 22. A third connecting hole 212 is provided at the end of the circular housing 21 away from the lampshade 22. A fourth connecting hole 421 is provided on the base plate 42 opposite to the third connecting hole 212. The ring light source 20 can be detachably connected to the upright plate 41 by fasteners passing through the third connecting hole 212 and the fourth connecting hole 421.

[0044] It is understood that, in some embodiments, similarly, the polarizer 30 is detachably connected to the ring light source 20, thereby facilitating the removal of the polarizer 30 from the ring light source 20 in the event of damage; for example, in one embodiment, to facilitate the removal and connection of the polarizer 30, refer to... Figure 1 , Figure 3 and Figure 4 A retaining ring 50 is fitted onto the side of the ring light source 20 near the polarizer 30, and the polarizer 30 is threadedly connected to the inner side of the retaining ring 50. Specifically, the retaining ring 50 is connected to the peripheral surface of the ring light source 20 by fasteners, and an annular boss 51 is provided on the inner side of the end of the retaining ring 50 near the polarizer 30. The annular boss 51 abuts against the end of the ring light source 20 near the polarizer 30 and is provided with an internal thread for connecting the polarizer 30. Therefore, when installing the polarizer 30 onto the ring light source 20, the retaining ring 50 can be first fitted onto the end of the ring light source 20 away from the connecting frame, so that the annular boss 51 abuts against the ring light source 20. The fixing ring 50 is initially positioned on the lampshade 22. Then, the fixing ring 50 is fixed to the circular housing 21 of the ring light source 20 with fasteners. Finally, the polarizing mirror 30 is screwed into the annular boss 51 of the fixing ring 50 to complete the installation of the polarizing mirror 30. When it is necessary to remove the polarizing mirror 30 and the fixing ring 50, the polarizing mirror 30 can be unscrewed from the annular boss 51 first, and then the fasteners on the fixing ring 50 can be removed and the fixing ring 50 can be removed from the ring light source 20.

[0045] Similarly, refer to Figure 3 The fixing ring 50 has multiple fifth connecting holes 52 along the axis, and the circular housing 21 has a sixth connecting hole 213 on the circumferential side corresponding to the position of the fifth connecting hole 52. Thus, the fixing ring 50 can be connected to the ring light source 20 by fasteners passing through the fifth connecting hole 52 and the sixth connecting hole 213.

[0046] The following is for reference only. Figure 5The following describes a visual inspection device according to a second aspect embodiment of the present invention. This visual inspection device includes the combined light source 100 described in the first aspect embodiment. It should be understood that, by employing the combined light source 100 described in the first aspect embodiment, the visual inspection device of this embodiment can more easily distinguish the chamfered surface of the product to be inspected from other surfaces, thereby improving the accuracy of the inspection results.

[0047] It should be understood that the visual inspection device also includes a visual inspection module. The light receiving end of the visual inspection module is located on the side of the coaxial light source 10 away from the ring light source 20, and the light receiving end of the visual inspection module is opposite to the detection window 111 to receive the reflected light that has passed through the polarizing mirror 30, the central hole 201, and the detection window 111 in sequence. For example, in one embodiment, referring to... Figure 5 The light receiving end is a camera 200, and the lens of the camera 200 is facing the detection window 111. The camera 200 can generate an image signal based on the received reflected light. The visual detection module also includes a processor (not shown in the figure) and a display (not shown in the figure). The processor is electrically connected to the camera 200 and the display, and can process the image signal transmitted by the camera 200 and display the detection result on the display.

[0048] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A combined light source, characterized in that, include: A coaxial light source has a detection window and a light outlet formed at both ends of its axial direction, with the detection window and the light outlet facing each other. A ring light source is connected to the light-emitting side of the coaxial light source, and the central hole of the ring light source is opposite to the light-emitting port to allow light emitted by the coaxial light source to pass through; A polarizing filter is connected to the light-emitting side of the ring light source and is coaxially arranged with the coaxial light source and the ring light source.

2. The combined light source according to claim 1, characterized in that, The angle between the light emission direction of the ring light source and the axis of the ring light source is greater than 25°.

3. A combined light source according to claim 1, characterized in that, The coaxial light source and the ring light source are detachably connected.

4. A combined light source according to claim 3, characterized in that, The annular light source has a detachable connecting bracket on the side near the coaxial light source. There are two connecting brackets, which are located on opposite sides of the central hole. The coaxial light source is disposed between the two connecting brackets and is detachably connected to the two connecting brackets.

5. A combined light source according to claim 4, characterized in that, The connecting bracket includes an upright plate and a base plate that are connected to each other. The base plate is connected to and attached to one axial end of the annular light source by fasteners. The upright plate is perpendicular to the base plate and attached to one end of the coaxial light source in the width direction. The coaxial light source is detachably connected to the upright plate by fasteners.

6. A combined light source according to claim 1, characterized in that, The polarizing mirror is detachably connected to the ring light source.

7. A combined light source according to claim 6, characterized in that, A retaining ring is fitted onto the side of the annular light source closest to the polarizing mirror, and the polarizing mirror is threadedly connected to the inner side of the retaining ring.

8. A combined light source according to claim 7, characterized in that, The fixing ring is connected to the peripheral side of the annular light source by fasteners, and an annular boss is provided on the inner side of the fixing ring near the polarizing mirror. The annular boss abuts against the end of the annular light source near the polarizing mirror and is provided with an internal thread for connecting the polarizing mirror.

9. A visual inspection device, characterized in that, It includes the combined light source as described in any one of claims 1 to 8.

10. A visual inspection device according to claim 9, characterized in that, It also includes a visual inspection module, the light receiving end of which is located on the side of the coaxial light source away from the ring light source, and the light receiving end of the visual inspection module is opposite to the inspection window.

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