TWM599908U - Metal surface inspection system and lighting device thereof - Google Patents

Abstract

The lighting device of the metal surface inspection system created by this invention includes a light-emitting module, a diffuser and a light source polarizer. The light emitting module is used for generating light. The diffuser plate is connected to the light-emitting module to allow light to pass through to form a surface light source. The light source polarizer is connected to the light-emitting module, and the surface light source passes through to form polarized light, which is used to illuminate the metal surface.

Description

Metal surface inspection system and lighting device thereof

This creation is related to the optical inspection system, especially a metal surface inspection system and its lighting device.

There are lines on the metal surface. At present, the process of photographing the metal surface through an optical inspection system for inspection requires complex image processing to eliminate the metal lines before it can be known whether there are defects on the metal surface, such as dust, dirt, damage or dents. Etc., but the complicated image processing process requires a long calculation time, which is not conducive to quick inspection. Although the calculation time can be shortened by high-speed computing equipment, the high-speed computing equipment is expensive to build.

In addition, in order to improve the illuminance of the metal surface, high-brightness or high-power light-emitting elements are usually selected. The light generated by the light-emitting elements is a point light source. The point light source directly illuminates the metal surface. The brightness of the illuminated area of the metal surface is uneven. Therefore, the image of the irradiated area contains not only metal surface textures, but also images caused by light, which will not help to eliminate metal textures.

In view of the above-mentioned deficiencies, the metal surface inspection system and its lighting device created by this invention illuminate the metal surface through the polarized light of the surface light source generated by the lighting equipment. The image capture device is shooting the inspection pattern on the metal surface, passing the polarized light in a specific direction. Provide lighting to simplify the process of eliminating metal lines on metal surfaces.

In order to achieve the above purpose, the metal surface inspection system created by this invention includes a lighting device and an image capturing device. The lighting device is used to generate polarized light to illuminate the metal surface, and the polarized light is a surface light source. The image capturing device receives the reflected light reflected by the polarized light on the metal surface. The polarization direction of the reflected light received by the imaging device is orthogonal to the polarization direction of the reflected light. The imaging device converts the reflected light into an inspection image.

In order to achieve the above purpose, the lighting device of the metal surface inspection system created by this invention includes a light-emitting module, a diffuser and a light source polarizer. The light emitting module is used for generating light. The diffuser plate is connected to the light-emitting module to allow light to pass through to form a surface light source. The light source polarizer is connected to the light-emitting module, and the surface light source passes through to form polarized light, which is used to illuminate the metal surface.

In this way, the lighting device of the metal surface inspection system created by this invention can provide the polarized light of a uniform surface light source through the diffuser and the light source polarizer. The polarization direction of the polarized light is the same as the polarization direction of the reflected light on the metal surface, so as to eliminate the metal pattern. .

The structure, composition, characteristics, assembly or use of the metal surface inspection system provided by this creation will be described in the detailed description of the subsequent implementation. However, those with ordinary knowledge in the field of creation should be able to understand that these detailed descriptions and specific embodiments listed in the implementation of this creation are only used to illustrate the creation and are not intended to limit the scope of patent applications for this creation.

Hereinafter, the corresponding preferred embodiments are listed in conjunction with the various drawings to illustrate the structure, composition, application, and effects of the metal surface inspection system of the present invention. However, the components, dimensions and appearance of the metal surface inspection system in the various drawings are only used to illustrate the technical features of this creation, but not to limit this creation.

As shown in FIG. 1, the metal surface inspection system 100 of the present invention is used to illuminate the metal surface 300 through a surface light source, and obtain an inspection image of the metal surface 300 by shooting the metal surface 300.

The metal surface inspection system 100 includes a lighting device 11 and an image capturing device 13. The illuminating device 11 is used to illuminate the inspection area of the metal surface 300 with polarized light 15 transmitted through the surface light source. The image capturing device 13 is used for receiving the reflected light 31 of the inspection area of the metal surface 300. The reflected light 31 is the reflected light generated by the polarized light 15 of the lighting device 11 irradiating the inspection area of the metal surface 300.

The metal surface 300 may be a surface of a metal plate, a metal block, a metal frame, or a metal wire, and the metal material may be copper, gold, aluminum, iron, stainless steel or other metal materials.

The image capturing device 13 includes a camera body 131 and a lens 133. The lens 133 is connected to the camera body 131. The lens 133 includes a lens 135 and a lens polarizer 137. The lens 135 is located between the lens polarizer 137 and the camera body 131. The reflected light 31 sequentially passes through the lens polarizer 137 and the lens 135, is received by the camera body 13, and is converted into an inspection image. In other embodiments, the polarizer 137 may be located at other positions of the lens 133. For example, the polarizer is located between the lens and the camera body, and the lens 133 may have more lenses.

As shown in FIG. 2, the lighting device 11 includes a light emitting module 111, a diffuser plate 113 and a light source polarizer 115. The light emitting module 111 is used for generating light 117. In this embodiment, the light-emitting module 111 includes a housing 119, a heat sink 121, and a light-emitting element 123. The radiator 121 is connected to the housing 119. The light-emitting element 123 is connected to the heat sink 121 to generate light 117, and the light-emitting element 123 is a light emitting diode (LED). The diffusion plate 113 is connected to the housing 119 of the light-emitting module 111. The light source polarizer 115 is connected to the housing 119 of the light-emitting module 111. The diffuser plate 113 is located between the light-emitting element 119 and the light source polarizer 115 of the light-emitting module 111. The light 117 of the light-emitting element 123 sequentially passes through the diffuser plate 113 and the light source polarizer 115 to generate polarized light 15 to provide the surface of the metal. Required lighting.

Because the lighting device 11 has a diffuser 113, the light 117 (ie point light source) generated by the light-emitting element 123 can be converted into a uniform ground light source through the diffuser 113 to provide uniform illumination, and then the uniform illumination is polarized by the light source. The sheet 115 generates polarized light 15, and therefore, the lighting device 11 can provide uniform polarized light 15.

1 again, the metal surface inspection system 100 of the present invention generates uniform or soft polarized light 15 through the illuminating device 11 to provide the illumination required for the inspection area of the metal surface 300. The uniform (soft) polarized light 15 can provide A surface light source with uniform illuminance on the metal surface 300. In addition, the polarization direction of the polarized light 15 and the reflected light 31 of the metal surface 300 is horizontally polarized light.

The image capturing device 13 receives the reflected light 31 of the metal surface 300. In this embodiment, the polarization direction of the reflected light 31 received by the sensor 132 of the image capturing device 13 is orthogonal to the reflected light 31, that is, the sensor 132 receives the vertical direction In this way, the image sensor 132 of the camera body 131 receives the reflected light 31 and converts the optical signal of the reflected light 31 through the lens polarizer 137 into an analog signal. The analog signal is converted into an inspection image through the image processing flow of the camera body 131. The sensor 132 may be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS), and the inspection image may be a static image or a dynamic image.

In this way, since the polarization directions of the polarized light 15 and the reflected light 31 are the same, the reflected light 31 of the metal surface 300 is consistent, and the metal pattern can be effectively eliminated. In addition, when there are foreign objects on the metal surface, such as dirt, dust or dust, the surface of the foreign objects will change the reflection angle of the reflected light 31, that is, the polarization direction. Therefore, the imaging device 13 can also easily distinguish the foreign objects. Location and size.

As shown in Figure 3, Figure 3 is the lighting device of the metal surface inspection system created by this invention omitting the light source polarizer. In short, the lighting device provides uniform (soft) illumination to the metal surface through the diffuser plate. In the inspection image of the image, it can be seen that the metal pattern on the metal surface still exists, and the position of the foreign object (the white dot in the image) is not obvious.

As shown in Figure 4, Figure 4 is the inspection image taken by the metal surface inspection system created by this invention. Compared with Figure 3, it can be clearly found that the metal pattern has been eliminated (the black part), leaving only the metal The foreign matter on the surface is like the white dots in Figure 4.

Through Figures 3 and 4, it can be found that the polarized light transmitted through the surface light source provides illumination of a specific polarization direction on the metal surface to form uniform (soft) illuminance and reflected light with a specific polarization direction on the metal surface to effectively eliminate metal lines.

The illumination of the polarized light of the illuminating device on the metal surface not only makes the inspection image taken by the imaging device easier to show the position, size and shape of the foreign object, but also simplifies the image processing process of the inspection image, so it can improve the inspection efficiency and quality.

Finally, it is emphasized again that the constituent elements disclosed in the previously disclosed embodiments of this creation are only examples and are not used to limit the scope of this case. The substitution or change of other equivalent elements should also be the scope of the patent application for this creation. Covered.

100: Metal surface inspection system 11: Lighting device 111: Light-emitting module 113: diffuser 115: light source polarizer 117: Light 119: Shell 121: radiator 123: Light-emitting element 13: Capture device 131: Camera body 132: Image sensor 133: lens 135: lens 137: lens polarizer 15: Polarized light 300: metal surface 31: reflected light

Figure 1 is a schematic diagram of the metal surface inspection system of this creation to inspect the metal surface. Fig. 2 is a schematic diagram of the lighting device in Fig. 1. Fig. 3 shows the illuminating device in Fig. 2 omitting the light source polarizer, and the imaging device takes an inspection image of the metal surface. FIG. 4 is an inspection image of a metal surface taken by the image capturing device of the metal surface inspection system of FIG. 1.

100: Metal surface inspection system

11: Lighting device

13: Capture device

131: Camera body

132: Image sensor

133: lens

135: lens

137: lens polarizer

15: Polarized light

300: metal surface

31: reflected light

Claims (4)

A metal surface inspection system, including: An illumination device for generating a polarized light to illuminate a metal surface, the polarized light being a surface light source; and An image capturing device receives a reflected light reflected by the polarized light on the metal surface, the polarization direction of the reflected light received by the image capturing device is orthogonal to the polarization direction of the reflected light, and the image capturing device receives the reflected light Convert to an inspection image. The metal surface inspection system according to claim 1, wherein the lighting device includes a light emitting module, a diffuser plate and a light source polarizer, the light emitting module is used to generate a light, the diffuser plate and the light source polarizer The light-emitting module is connected, and the light sequentially passes through the diffuser plate and the light source polarizer to form the polarized light. The metal surface inspection system of claim 1, wherein the image capturing device includes a camera body and a lens, the lens is connected to the camera body, and includes a lens and a lens polarizer, and the reflected light sequentially passes through the lens The polarizer and the lens are received by the camera body and converted into the inspection image. A lighting device of a metal surface inspection system, including: A light-emitting module for generating a light; A diffusion plate connected to the light emitting module and used for the light to pass through to form a surface light source; and A light source polarizer is connected to the light-emitting module and allows the surface light source to pass through to form a polarized light for illuminating a metal surface.

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