Light source device for detecting smooth glass workpiece

Abstract

The utility model discloses a light source device for detecting a smooth glass workpiece. The light source device comprises a parallel coaxial light module, a diffused light module, a low-angle light module and a reflection box, a first light-transmitting lens is arranged at the bottom of the reflection box, a first reflection lens and a second reflection lens are arranged on the two opposite inner side walls respectively, and the first reflection lens and the second reflection lens are oppositely and symmetrically arranged on the two sides of the first light-transmitting lens. A third reflecting lens and a second light-transmitting lens are arranged on the two sides of the top of the reflecting box respectively; the third reflecting lens is positioned above the second reflecting lens and is positioned at the light emitting end of the parallel coaxial light module; the second light-transmitting lens is positioned above the first reflecting lens; the diffused light module is located above the first light-transmitting lens, and the low-angle light module is located below the first light-transmitting lens. According to the utility model, three kinds of light modules are integrated and are matched with the reflection / light-transmitting lens in the reflection box, so that total reflection bright field illumination and low dark field illumination on the surface of a glass workpiece can be realized, and different visual inspection shooting requirements are met.

Description

Technical Field

[0001] The utility model belongs to the technical field of industrial vision detection equipment, and particularly relates to a light source device for detecting smooth glass workpieces. Background Technique

[0002] As a core component of machine vision, LED light sources have been widely used in the defect detection of various industrial products. For the defect detection of smooth glass workpieces, two methods, namely bright-field illumination and dark-field illumination, are commonly used. In bright-field illumination, the camera and the light source are placed on the left and right sides of the workpiece to be detected, facing each other. The camera and the light source form a certain angle with the upper surface of the workpiece, and the fine defects on the surface of the workpiece are observed through the total reflection on the glass surface. In dark-field illumination, the angle of total reflection is avoided, and the light source and the camera are arranged on the same side, or installed on the opposite side but the angles between the light source and the workpiece surface and between the camera and the workpiece surface are different. Since the installation positions of the light sources in the two methods are not exactly the same, in order to meet the requirements of both illumination methods at the same time, the constructed illumination system often requires a large installation space, which is difficult to achieve when the space is limited or the installation angle of the camera is fixed. Content of the Utility Model

[0003] In order to overcome the deficiencies of the prior art, the purpose of the utility model is to provide a combined light source device with a compact structure and integrated bright-field and dark-field illumination.

[0004] The purpose of the utility model is achieved by the following technical solutions:

[0005] A light source device for detecting smooth glass workpieces includes: a parallel coaxial light module, a diffused light module, a low-angle light module, and a reflection box; the parallel coaxial light module is arranged on the top of the reflection box, the diffused light module is arranged inside the reflection box, and the low-angle light module is arranged at the bottom of the reflection box; a horizontally arranged first light-transmitting lens is arranged at the bottom of the reflection box; first and second reflecting lenses are respectively arranged on two opposite inner side walls of the reflection box, the first reflecting lens and the second reflecting lens are opposite to each other and symmetrically arranged on both sides of the first light-transmitting lens, and the first reflecting lens and the second reflecting lens are inclined; third reflecting lenses and second light-transmitting lenses are respectively arranged on both sides of the top of the reflection box; the third reflecting lens is located above the second reflecting lens and at the light-emitting end of the parallel coaxial light module, and the third reflecting lens is inclined; the second light-transmitting lens is horizontally arranged and located above the first reflecting lens; the diffused light module is located above the first light-transmitting lens, and the low-angle light module is located below the first light-transmitting lens.

[0006] Further, the parallel coaxial light module, the diffused light module, and the low-angle light module are respectively electrically connected to an external power supply through their respective power lines and can be independently controlled.

[0007] Further, the parallel coaxial light module includes a coaxial light source body and a cylindrical emitter. The light generated by the coaxial light source body is irradiated onto the third reflecting lens through the cylindrical emitter.

[0008] Further, a horizontal light-transmitting lens is disposed between the third reflecting lens and the second reflecting lens.

[0009] Further, the diffused light module is fixed to the top plate of the reflection box. The diffused light module includes a light source body and a diffusely reflecting plate disposed obliquely. The diffusely reflecting plate is perpendicular to the direction of the light generated by the light source body.

[0010] Further, the low-angle light module includes an annular light source body, and the lamp beads of the light source body emit light at an inclined angle.

[0011] Further, the reflection box is provided with a mounting portion. The mounting portion has a mounting surface in the vertical direction, and the mounting portion is provided with a horizontally extending threaded hole; the mounting portion is disposed on the same side as the first reflecting lens, and / or the mounting portion is disposed on the same side as the second reflecting lens.

[0012] Further, the camera lens is vertically disposed above the second light-transmitting lens, and the workpiece to be detected is located below the first light-transmitting lens.

[0013] Further, the first reflecting lens is used to vertically reflect the reflected light to the second light-transmitting lens. The third reflecting lens is used to vertically reflect the light generated by the parallel coaxial light module into the reflection box. The second reflecting lens is used to obliquely reflect the light generated by the parallel coaxial light module entering the reflection box to the workpiece to be detected; the light generated by the diffused light module and the low-angle light module is obliquely irradiated onto the workpiece to be detected; the light passes through the second light-transmitting lens, leaves the reflection box, and enters the camera lens.

[0014] Further, the included angle between the light reflected by the second reflecting lens onto the surface of the workpiece to be detected and the surface of the workpiece to be detected is 15° to 75°; the included angle between the third reflecting lens and the horizontal direction is 30° to 60°.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0016] The utility model designs a reflection box with multiple reflection lenses and light-transmitting lenses, and at the same time integrates different light modules. When different light modules are started, light is reflected and transmitted in the reflection box, which can meet various shooting lighting requirements, realizes the integrated design of bright and dark fields, can not only meet the total reflection bright field lighting requirements of the surface of the smooth glass workpiece, but also meet the low-degree dark field lighting requirements. Moreover, through a reasonable optical path design, the overall structure is compact, occupies little space, and can support the vertical installation condition of the camera. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of an embodiment of the utility model;

[0018] Figure 2 is a schematic structural diagram of the embodiment of the utility model after removing the side plate;

[0019] Figure 3 is a schematic diagram of another angle of the embodiment of the utility model after removing the side plate;

[0020] Figure 4 is an optical path diagram of the embodiment of the utility model when using a parallel coaxial light module;

[0021] Figure 5 is an optical path diagram of the embodiment of the utility model when using a diffused light module;

[0022] Figure 6 is an optical path diagram of the embodiment of the utility model when using a low-angle light module. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] Next, in combination with the specific embodiments, the present utility model will be further described.

[0024] As Figure 1 , Figure 2 and Figure 3 shown, the light source device for detecting smooth glass workpieces in this embodiment includes a parallel coaxial light module 1, a diffused light module 2, a low-angle light module 3, and a reflection box 4. The parallel coaxial light module 1 is arranged on the top of the reflection box 4, the diffused light module 2 is arranged inside the reflection box 4, and the low-angle light module 3 is arranged at the bottom of the reflection box 4. Each light module is electrically connected to an external power supply (not shown) through its respective power lines a, b, and c, and each light module can be independently controlled, and it is possible to select to turn on a single light module or a combination of multiple light modules.

[0025] The reflection box 4 is used to reflect the light emitted from the optical module to the workpiece to be detected and then reflect it to the camera lens 100. The reflection box 4 in this embodiment is a box body roughly in the shape of a trapezoid. A first light-transmitting lens 4-1 is provided at the bottom of the reflection box 4, and the first light-transmitting lens 4-1 can achieve light transmission in any direction of the light source. The workpiece to be detected is placed below the reflection box 4, and the placement plane (horizontal plane) of the workpiece to be detected is parallel to the first light-transmitting lens 4-1.

[0026] A first reflection lens 4-2 and a second reflection lens 4-3 are respectively provided on two opposite inner side walls of the reflection box 4. The first reflection lens 4-2 and the second reflection lens 4-3 are arranged opposite to each other and symmetrically arranged on both sides of the first light-transmitting lens 4-1. There is an angle between the first reflection lens 4-2, the second reflection lens 4-3 and the vertical direction, that is, the first reflection lens 4-2 and the second reflection lens 4-3 are inclined. The second reflection lens 4-3 is used to obliquely reflect the light to the surface of the workpiece to be detected. Usually, it is necessary to obliquely irradiate the workpiece to be detected with light to achieve the effect of workpiece detection. The angle between the light obliquely reflected to the surface of the workpiece to be detected and the surface of the workpiece to be detected can be 15° to 75°. The first reflection lens 4-2 and the second reflection lens 4-3 are symmetrically arranged, and a reflection optical path symmetric to the second reflection lens 4-3 can be formed. Specifically, the angle between the first reflection lens 4-2 and the horizontal direction and the angle between the second reflection lens 4-3 and the horizontal direction in this embodiment are 67.5 degrees. Thus, in this embodiment, the angle between the light reflected by the second reflection lens 4-3 to the surface of the workpiece to be detected and the surface of the workpiece to be detected is 45 degrees (as Figure 4 ), realizing total internal reflection of light near 45 degrees. The total internal reflection at 45 degrees can make the concave and convex textures of the detected workpiece more obvious in the image. In other embodiments, the angle between the first reflection lens 4-2 and the horizontal direction and the angle between the second reflection lens 4-3 and the horizontal direction can also be set to other angles, as long as the angle between the light obliquely reflected to the surface of the workpiece to be detected and the surface of the workpiece to be detected can be 15° to 75°.

[0027] At the top of the reflection box 4, a third reflection lens 4-4 and a second light-transmitting lens 4-5 are respectively arranged. The third reflection lens 4-4 and the second light-transmitting lens 4-5 are respectively located on both sides of the parallel coaxial light module 1. The third reflection lens 4-4 is located above the second reflection lens 4-3 and at the light-emitting end of the parallel coaxial light module 1, and is used to vertically reflect the light emitted by the parallel coaxial light module 1 onto the second reflection lens 4-3. The third reflection lens 4-4 is also inclined. The included angle between the third reflection lens 4-4 and the horizontal direction is 30° to 60°. In this embodiment, the included angle between the third reflection lens 4-4 and the horizontal direction is 45°, so that the light emitted by the parallel coaxial light module 1 can be vertically reflected onto the second reflection lens 4-3, and cooperate with the second reflection lens 4-3 to achieve total internal reflection of light near 45 degrees.

[0028] The second light-transmitting lens 4-5 is located above the first reflection lens 4-2. The second light-transmitting lens 4-5 is horizontally arranged, and the light exits the reflection box 4 through the second light-transmitting lens 4-5. The camera lens 100 is located above the second light-transmitting lens 4-5. The light can enter the camera lens 100 through the second light-transmitting lens 4-5. Specifically, the camera lens 100 is vertically installed above the second light-transmitting lens 4-5 and forms an up-and-down structured vision detection module with the light source device. Through the action of the lenses in the reflection box 4, the reflection box 4 can realize the light path from top to bottom and the mirror reflection on the left and right sides.

[0029] The parallel coaxial light module 1 is a coaxial light source. The parallel coaxial light module 1 emits light in the horizontal direction. The light is reflected at the third reflection lens 4-4 and vertically enters the reflection box 4. The parallel coaxial light module 1 in this embodiment includes a coaxial light source body and a cylindrical emitter. The light generated by the coaxial light source body is irradiated onto the third reflection lens 4-4 through the cylindrical emitter for reflection. In some embodiments, a horizontal light-transmitting lens can be arranged between the third reflection lens 4-4 and the second reflection lens 4-3. After the light is reflected by the third reflection lens 4-4, it passes through the light-transmitting lens and vertically enters the reflection box 4.

[0030] The diffused light module 2 is arranged in the reflection box 4. The diffused light module 2 in this embodiment is fixed to the top plate of the reflection box 4. The diffused light module 2 includes a light source body and a diffusing reflection plate as the light source light cover. The diffusing reflection plate is perpendicular to the light direction generated by the light source body. The light generated by the light source body forms diffused light after passing through the diffusing reflection plate, and irradiates the surface of the workpiece to be detected through the first light-transmitting lens 4-1. The included angle between the diffusing reflection plate of the diffused light module 2 in this embodiment and the horizontal direction is 20 degrees (such as Figure 4 ).

[0031] A low-angle light module refers to a light module in which the angle between the light generated by the light module and the surface of the workpiece to be detected is less than 45 degrees. A light module that can achieve this condition is a low-angle light module. Since the angle between the light generated by the low-angle light module and the surface of the workpiece to be detected is less than 45 degrees, most of the light irradiated on the workpiece to be detected cannot be reflected back to the camera lens through the workpiece. The low-angle light module 3 of this embodiment is arranged at the bottom of the reflection box 4 and is located below the first light-transmitting lens 4-1. The low-angle light module 3 of this embodiment uses an annular light source body, and the lamp beads of the light source body emit light at an angle of 30 degrees with the horizontal plane, and the angle between the emitted light and the surface of the workpiece to be detected is 30 degrees, realizing a low-angle illumination method. The inner diameter of the annular light source body of this embodiment is larger than the outer contour of the first light-transmitting lens 4-1, that is, the projection of the first light-transmitting lens 4-1 on the horizontal plane is within the projection of the annular light source body on the horizontal plane, so as to ensure that the low-angle light module does not block the light generated by other light modules. In other embodiments, the low-angle light module can also use strip light.

[0032] To facilitate the fixing of the light source device, optionally, one side of the reflection box 4 of this embodiment is provided with an installation part 4a. The installation part 4a has a vertical installation surface, and a horizontally extending threaded hole is machined at the installation part 4a. The light source device can be fixed to the vision detection device through a threaded fastener. The installation part 4a can be on the same side as the first reflection lens, or on the same side as the second reflection lens, or both sides are provided.

[0033] The following combines Figures 4 to 6 to illustrate the optical path when each light module of this embodiment is independently turned on.

[0034] As Figure 4 shown, when only the parallel coaxial light module 1 is turned on, the light generated by the parallel coaxial light module 1 is reflected by the third reflection lens 4-4 and then vertically enters the reflection box 4; then it is reflected at the second reflection lens 4-3, passes through the first light-transmitting lens 4-1, and is obliquely irradiated on the workpiece to be detected, the light surface glass workpiece, at an angle of 45 degrees, forming specularly reflected light on the horizontal smooth area of the light surface glass workpiece. Part of the reflected light is reflected by the first reflection lens 4-2 and passes through the second light-transmitting lens 4-5 to enter the camera lens 100, so as to obtain the corresponding light reflection of the workpiece to be detected, the light surface glass workpiece. The light generated by the parallel coaxial light module 1, after multiple specular reflections and transmissions in the reflection box 4, the light with an angle of about 45 degrees with the surface of the workpiece to be detected finally enters the camera lens.

[0035] As Figure 5As shown, when only the diffused light module 2 is turned on, the diffused light generated by the diffused light module 2 passes through the first light-transmitting lens 4-1 and irradiates the workpiece. When the light irradiates the smooth horizontal area of the workpiece, part of the light cannot be directly reflected onto the first reflecting lens 4-2. After part of the light is reflected by the first reflecting lens 4-2, it passes through the second light-transmitting lens 4-5 and enters the camera lens 100, meeting the general shooting light source requirements. In the diffuse reflection light mode, when there are concave and convex areas on the surface of the workpiece, the concave and convex areas can reflect stronger light, thus achieving better differential imaging for the inconsistent concave and convex surfaces.

[0036] As Figure 6 shown, when only the low-angle light module 3 is turned on, the light generated by the low-angle light module 3 directly irradiates the workpiece. Most of the light undergoes total reflection on the smooth plane of the workpiece and is reflected to the external area away from the camera lens 100. Only part of the light is reflected back to the first reflecting lens 4-2 when it encounters the concave and convex positions, and after being reflected by the first reflecting lens 4-2, it passes through the second light-transmitting lens 4-5 and enters the camera lens 100. The more obvious the concavity and convexity on the surface of the workpiece, the stronger the reflected light, achieving the effect of dark-field shooting.

[0037] The present utility model designs a reflection box with multiple reflecting lenses and light-transmitting lenses. When different light modules are activated, the light irradiates the surface of the workpiece at an inclined angle or passes through the reflecting lenses and light-transmitting lenses at an inclined angle. Part of the light is reflected on the surface of the workpiece, and the reflected light then enters the camera lens through the reflecting lenses and light-transmitting lenses, which can meet various shooting lighting requirements, achieving an integrated design of bright and dark fields, with a compact structure, and supporting the vertical installation condition of the camera, enabling total reflection bright-field illumination within a small installation space range.

[0038] The foregoing embodiments illustrate the optical path by taking the case of only turning on one light module as an example. In actual applications, one of the light modules can be turned on alone according to the detection requirements, or two or more light modules can be turned on simultaneously. When the light modules are used in combination, the optical path generated by each light module is the same as that when it is used alone. Refer to the previous description and details will not be repeated here.

[0039] For those skilled in the art, various corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all these changes and deformations should fall within the protection scope of the claims of the present utility model.

Claims

1. A light source device for detecting a smooth glass workpiece, characterized in that: include: Parallel coaxial optical modules, diffuse optical modules, low-angle optical modules and reflective boxes; The parallel coaxial optical module is arranged at the top of the reflective box, the diffuse optical module is arranged inside the reflective box, and the low-angle optical module is arranged at the bottom of the reflective box; The bottom of the reflective box is provided with a first light-transmitting lens arranged horizontally; the two opposite inner side walls of the reflective box are respectively provided with a first reflective lens and a second reflective lens, the first reflective lens and the second reflective lens are opposite to each other and symmetrically arranged on both sides of the first light-transmitting lens, and the first reflective lens and the second reflective lens are arranged obliquely; the top two sides of the reflective box are respectively provided with a third reflective lens and a second light-transmitting lens; the third reflective lens is located above the second reflective lens and at the light emitting end of the parallel coaxial optical module, and the third reflective lens is arranged obliquely; the second light-transmitting lens is arranged horizontally and located above the first reflective lens; The diffuse light module is located above the first light-transmitting lens, and the low-angle light module is located below the first light-transmitting lens.

2. The light source device for detecting a smooth glass workpiece according to claim 1, characterized in that: The parallel coaxial optical module, the diffuse optical module and the low-angle optical module are electrically connected to an external power source through respective power lines and can be independently controlled.

3. The light source device for detecting a polished glass workpiece according to claim 1, characterized in that: The parallel coaxial optical module includes a coaxial light source and a cylindrical emitter. The light generated by the coaxial light source is irradiated to the third reflective lens through the cylindrical emitter.

4. The light source device for detecting a polished glass workpiece according to claim 1, characterized in that: A horizontal light-transmitting lens is arranged between the third reflecting lens and the second reflecting lens.

5. The light source device for detecting a polished glass workpiece according to claim 1, characterized in that: The diffuse light module is fixed to the top plate of the reflective box. The diffuse light module comprises a light source and an inclined diffuse reflection plate. The directions of the light generated by the diffuse reflection plate and the light source are perpendicular.

6. The light source device for detecting a polished glass workpiece according to claim 1, characterized in that: The low-angle light module comprises a ring-shaped light source body, and the lamp beads of the light source body emit light at an inclined angle.

7. The light source device for detecting a polished glass workpiece according to claim 1, characterized in that: The reflective box is provided with a mounting portion, the mounting portion has a mounting surface along the vertical direction, and the mounting portion is provided with a horizontally extending threaded hole; the mounting portion and the first reflective lens are arranged on the same side, and / or the mounting portion and the second reflective lens are arranged on the same side.

8. The light source device for detecting a polished glass workpiece according to claim 1, characterized in that: The camera lens is vertically arranged above the second light-transmitting lens, and the workpiece to be inspected is located below the first light-transmitting lens.

9. The light source device for detecting a polished glass workpiece according to claim 1, characterized in that: The first reflecting lens is used to reflect the reflected light vertically to the second light-transmitting lens, the third reflecting lens is used to reflect the light generated by the parallel coaxial light module vertically into the reflecting box, and the second reflecting lens is used to obliquely reflect the light generated by the parallel coaxial light module entering the reflecting box to the workpiece to be inspected; the light generated by the diffuse light module and the low-angle light module is obliquely irradiated onto the workpiece to be inspected; the light passes through the second light-transmitting lens, leaves the reflecting box, and enters the camera lens.

10. The light source device for detecting a polished glass workpiece according to claim 1, characterized in that: The angle between the light reflected by the second reflective lens to the surface of the workpiece to be detected and the surface of the workpiece to be detected is 15° to 75°; the angle between the third reflective lens and the horizontal direction is 30° to 60°.

Images