Arc-shaped surface light source system and detection system

Abstract

The utility model relates to the field of detection equipment, in particular to an arc-shaped surface light source system and a detection system.The arc-shaped surface light source system comprises a first light source and a second light source which are arranged at intervals, the first light source and the second light source respectively comprise a plurality of lamp beads arranged in an arc shape, and the arc-shaped surface light source system further comprises a light guide plate which is a transparent arc-shaped plate; the first light source and the second light source are arranged on the two sides of the light guide plate respectively, and the first light source and the second light source enter the light guide plate and exit. According to the utility model, the two rows of lamp beads arranged in the arc shape are arranged, and the arc-shaped light guide plate is arranged between the two rows of lamp beads, so that an arc-shaped surface light source system is formed, the illumination of an arc-shaped surface light source irradiating the arc-shaped outer wall of a detected object is relatively uniform, the contrast ratio is relatively good, and the obtained image characteristics can meet the detection requirements. And the arc-shaped surface light source systems with different bending radiuses can be selected according to the outer walls of different detected objects, and outer wall defect feature information is extracted, so that different detection requirements can be met.

Description

Technical Field

[0001] The utility model relates to the field of detection equipment, and particularly relates to an arc surface light source system and a detection system. Background Art

[0002] In the visual inspection of product appearance defects, the outer walls of various wines, beverages, and convenience foods are usually arc-shaped. When using the existing planar light source for detection, the illuminance of the planar light source on the surface of the object to be measured is uneven, the contrast is not good, and the acquired image features are difficult to meet the detection requirements. Summary of the Utility Model

[0003] The purpose of the utility model is to overcome the deficiencies in the prior art that the illuminance of the planar light source on the surface of the object to be measured is uneven, the contrast is not good, and the acquired image features are difficult to meet the detection requirements, and to provide an arc surface light source system and a detection system.

[0004] In a first aspect, the utility model provides an arc surface light source system, including

[0005] A first light source and a second light source arranged at intervals, the first light source and the second light source respectively include a plurality of lamp beads arranged in an arc,

[0006] A light guide plate, the light guide plate is a transparent arc-shaped plate, the first light source and the second light source are respectively arranged on both sides of the light guide plate, and the first light source and the second light source are incident on the light guide plate and then emitted.

[0007] The utility model forms an arc surface light source system by arranging two rows of lamp beads arranged in an arc and arranging an arc-shaped light guide plate between the two rows of lamp beads. The illuminance of the arc surface light source on the arc-shaped outer wall of the object to be detected is relatively uniform, the contrast is good, and the acquired image features can meet the detection requirements.

[0008] Moreover, an arc surface light source system with different bending radii can be selected according to the outer walls of different objects to be detected, and the defect feature information of the outer wall can be extracted, so as to be able to adapt to different detection requirements.

[0009] Furthermore, by setting the arc-shaped light guide plate as a transparent structure, the image acquisition device can be directly arranged on one side of the light guide plate, which is convenient for the deployment of the image acquisition device and also convenient for perspective capture, so as to be able to meet the detection requirements of the defect features of the arc-shaped outer wall.

[0010] Preferably, the radian of the trajectory line of the lamp beads is consistent with the radian of the arc surface of the light guide plate, so as to facilitate the light emitted by the lamp beads to be incident on the light guide plate and then emitted after being reflected by the light guide plate.

[0011] Preferably, one side of the light guide plate is provided with microstructures, and the other side is a smooth surface. The microstructures can reflect light. By providing the microstructures that can reflect light, part of the light can be directly emitted from the smooth surface, and the other part of the light can be emitted from the smooth surface after being reflected by the microstructures. Therefore, the smooth surface can be arranged close to the object to be detected, so that most of the light can be emitted towards the object to be detected, thereby improving the utilization rate of light and meeting the brightness requirements for visual inspection.

[0012] Preferably, the microstructures are arc-shaped protrusions or arc-shaped depressions, and the microstructures are arranged in an array or randomly.

[0013] Preferably, the arc-shaped surface light source system further includes a protection plate, and the protection plate is a transparent arc-shaped plate. The protection plate is used to protect the microstructures and reduce the damage to the microstructures during use.

[0014] Preferably, the light guide plate is a PMMA plate.

[0015] Preferably, the arc-shaped surface light source system further includes a radiator, and the radiator is used to dissipate heat from the first light source and the second light source to improve the service life of the light source.

[0016] In a second aspect, the present invention provides a detection system, including an image acquisition device, characterized in that it further includes any one of the arc-shaped surface light source systems described above.

[0017] Preferably, the two arc-shaped surface light source systems are symmetrically arranged on both sides of the object to be detected, and the light guide plate is bent towards the object to be detected. In this way, through the two relatively arranged arc-shaped surface light source systems, the defect detection of the entire outer peripheral wall of the object to be detected can be completed at one station, improving the detection efficiency.

[0018] Preferably, a plurality of the image acquisition devices are arranged at intervals along the circumferential direction of the arc-shaped surface light source system, and the axis of the image acquisition device is perpendicular to the arc-shaped surface of the light guide plate. With such an arrangement, it is convenient for the image acquisition device to collect the defect information of the outer wall to be detected, improving the defect detection accuracy.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] The present invention forms an arc-shaped surface light source system by arranging two rows of arc-shaped lamp beads and an arc-shaped light guide plate between the two rows of lamp beads. The illuminance of the arc-shaped surface light source on the arc-shaped outer wall of the object to be detected is relatively uniform, the contrast is good, and the obtained image features can meet the detection requirements.

[0021] Moreover, an arc-shaped surface light source system with different bending radii can be selected according to the outer walls of different objects to be detected to extract the defect feature information of the outer wall, so as to be able to adapt to different detection requirements.

[0022] Further, by setting the arc-shaped light guide plate as a transparent structure, the image acquisition device can be directly arranged on one side of the light guide plate, which facilitates the deployment of the image acquisition device and also facilitates perspective capture, thereby meeting the detection requirements for the defect characteristics of the arc-shaped outer wall. Description of the Drawings

[0023] Figure 1 It is a three-dimensional structural schematic diagram of the arc-shaped surface light source system described in the present utility model.

[0024] Figure 2 It is a three-dimensional structural schematic diagram of the arc-shaped surface light source system described in the present utility model with structures such as the light guide plate and the radiator hidden.

[0025] Figure 3 It is a three-dimensional structural schematic diagram of the light guide plate described in the present utility model.

[0026] Figure 4 It is a three-dimensional structural schematic diagram of the light guide plate and the protection plate described in the present utility model.

[0027] Figure 5 It is a three-dimensional structural schematic diagram of the protection plate described in the present utility model.

[0028] Figure 6 It is a three-dimensional structural schematic diagram of the detection system described in the present utility model.

[0029] Figure 7 It is the simulation effect of the detection system described in the present utility model Figure 1 。

[0030] Figure 8 It is the simulation effect of the detection system described in the present utility model Figure 2 。

[0031] Markings in the figure:

[0032] 1 - First light source, 2 - Second light source, 3 - Light guide plate, 31 - First side, 32 - Second side, 4 - Protection plate, 5 - Radiator, 6 - Image acquisition device, 7 - Object to be detected, 8 - Conveyor belt, 9 - Outer frame. Detailed Embodiments

[0033] The following further describes the present utility model in detail with reference to specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present utility model to the following embodiments. All technologies implemented based on the content of the present utility model belong to the scope of the present utility model.

[0034] Unless otherwise specified, in the description of the specific embodiments of the present utility model, the terms indicating the orientation or positional relationship, such as "upper", "lower", "left", "right", "center", "inner", "outer", etc., are all expressions based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product / device / equipment of this utility model is commonly used. These terms of orientation or positional relationship are only for the convenience of describing the solution of the present utility model or simplifying the description in the specific embodiments, so as to facilitate technicians to quickly understand the solution, rather than indicating or implying that a specific device / component / element must have a specific orientation or be constructed and operated in a specific positional relationship. Therefore, it should not be construed as a limitation to the present utility model.

[0035] In addition, for terms such as "horizontal", "vertical", "hanging", "parallel", etc., it does not mean that the corresponding device / component / element is required to be absolutely horizontal or vertical or hanging or parallel, but it can be slightly inclined or have a deviation. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but it can be slightly inclined. Or, it can be simply understood that the corresponding device / component / element is arranged in the directions of "horizontal", "vertical", "hanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still perform its function in the solution of the present utility model.

[0036] In addition, for the terms such as "first", "second", "third", etc., they are only used to distinguish the description of the same or similar components, and should not be understood as emphasizing or implying the relative importance of specific components.

[0037] In addition, in the description of the embodiments of the present utility model, "several", "multiple", "a number of" represent at least 2. It can be any situation such as 2, 3, 4, 5, 6, 7, 8, 9, etc., and even can be more than 9.

[0038] In addition, in the description of the technical solution of the present utility model, unless otherwise clearly specified / defined / limited, for the terms "set", "installed", "connected", "linked", "provided with", "laid", "arranged", they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be connection means commonly used in the art such as welding, riveting, bolting, threaded connection, etc. This kind of connection can be a mechanical connection, an electrical connection or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements.

[0039] Example 1

[0040] As Figure 1-2 shown, a curved surface light source system includes a first light source 1, a second light source 2, and a light guide plate 3. The first light source 1 and the second light source 2 are arranged at intervals, and the light guide plate 3 is arranged between the first light source 1 and the second light source 2, that is, the first light source 1 and the second light source 2 are respectively arranged on both sides of the light guide plate 3, and the first light source 1 and the second light source 2 emit light into the light guide plate 3 and then emit it out. Preferably, an outer frame 9 can be provided to fix the first light source 1 and the second light source 2, and the light guide plate can be directly clamped between the first light source 1 and the second light source 2. In a specific implementation manner, the first light source 1 can be arranged at the upper end of the light guide plate 3, and the first light source 1 can be arranged at the lower end of the light guide plate 3, and the light guide plate 3 is vertically placed between the first light source 1 and the second light source 2.

[0041] The first light source 1 includes a plurality of lamp beads arranged in an arc, and the second light source 2 also includes a plurality of lamp beads arranged in an arc. The first light source 1 and the second light source 2 are respectively arranged on two sides with a curvature of the light guide plate 3. In a further preferred technical solution, the curvature of the trajectory line of the lamp beads is consistent with the curvature of the arc surface of the light guide plate 3, so as to facilitate the light of the light source to enter the light guide plate 3, improve the utilization rate of light, and also can minimize the thickness and occupied space of the first light source 1 and the second light source 2.

[0042] Preferably, the lamp beads of the first light source 1 and the lamp beads of the second light source 2 are arranged oppositely. For example, the lamp beads of the first light source 1 emit light downward, and the light enters the light guide plate 3 from the upper end of the light guide plate 3; the lamp beads of the second light source 2 emit light upward, and the light enters the light guide plate 3 from the lower end of the light guide plate 3.

[0043] The light guide plate 3 is a transparent arc-shaped plate, such as a PMMA plate. By setting the arc-shaped light guide plate 3 as a transparent structure, the image acquisition device 6 can be directly arranged on one side of the light guide plate 3, which is convenient for the deployment of the image acquisition device 6 and also convenient for perspective capture, so as to meet the detection requirements of the defect characteristics of the arc-shaped outer wall.

[0044] As Figure 3 shown, in an optional implementation manner, a micro-structure can be provided on one arc-shaped side surface (i.e., the first side surface 31) of the light guide plate 3, and the opposite arc-shaped side surface (i.e., the second side surface 32) can be set as a smooth surface, and the micro-structure can reflect light.

[0045] After setting the microstructures capable of reflecting light, when the light emitted by the lamp beads enters the light guide plate 3, part of the light can directly exit from the light-emitting surface, and the other part of the light can be reflected by the microstructures and then exit from the light-emitting surface after hitting the microstructures. Therefore, the light-emitting surface can be arranged close to the object to be detected, so that most of the light can be directed towards the object to be detected, thereby improving the utilization rate of light and meeting the brightness requirements for visual inspection. Further, the microstructures can be arc-shaped protrusions, arc-shaped depressions, etc., and the microstructures are arranged in an array or irregularly, such as randomly arranged.

[0046] In an alternative embodiment, as Figure 4-5 shown, a protection plate 4 can also be arranged near the arc-shaped side surface provided with the microstructures, that is, the protection plate 4 is arranged close to the first side surface 31. The protection plate 4 can be set as a transparent arc-shaped plate, and the protection plate 4 is used to protect the microstructures and reduce the wear of the microstructures.

[0047] In an alternative embodiment, a radiator 5 can also be arranged at the first light source 1 and the second light source 2, and the radiator 5 is used for dissipating heat from the first light source 1 and the second light source 2.

[0048] Embodiment 2

[0049] As Figure 6 shown, a detection system includes an image acquisition device 6 and also includes an arc-shaped surface light source system as described in Embodiment 1.

[0050] In an alternative embodiment, the two arc-shaped surface light source systems are symmetrically arranged on both sides of the object to be detected 7, and the light guide plate 3 is bent towards the object to be detected, that is, the object to be detected 7 can be arranged between the two arc-shaped surface light source systems, and the two arc-shaped surface light source systems are arranged around the object to be detected 7. In this way, after the object to be detected 7 is placed on the conveyor belt 8, through the two relatively arranged arc-shaped surface light source systems, the defect detection of the entire outer peripheral wall of the object to be detected 7 can be completed at one station, improving the detection efficiency.

[0051] In an alternative embodiment, a plurality of the image acquisition devices 6 are arranged at intervals along the circumferential direction of the arc-shaped surface light source system, and the axis of the image acquisition device 6 is perpendicular to the arc-shaped surface of the light guide plate 3. With such an arrangement, it is convenient for the image acquisition device to collect the defect information of the outer wall to be detected, improving the defect detection accuracy.

[0052] In some embodiments, the diameter of the object to be detected 7 (receiving surface): 50 mm, height 80 mm, outer diameter of the light guide plate: 300 mm, height 120 mm, wall thickness of the light guide plate: 5 mm. In the simulation results, the lighting range formed by the light source system is about 100°, the illuminance of the receiving surface: 3000 LUX, and the surface illuminance uniformity: 85%, as Figure 7-8As shown, it can meet the requirements of visual inspection.

[0053] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An arc surface light source system, characterized in that, Comprising First light sources (1) and second light sources (2) arranged at intervals, wherein the first light sources (1) and the second light sources (2) respectively comprise a plurality of lamp beads arranged in an arc shape, A light guide plate (3), the light guide plate (3) being a transparent arc-shaped plate, the first light sources (1) and the second light sources (2) being respectively arranged on both sides of the light guide plate (3), and the first light sources (1) and the second light sources (2) being incident on the light guide plate (3) and then emitted.

2. The arc surface light source system according to claim 1, characterized in that, The radian of the locus line of the lamp beads is consistent with the radian of the arc-shaped surface of the light guide plate (3).

3. The arc surface light source system according to claim 1, characterized in that One side of the light guide plate (3) is provided with microstructures, and the other side is a smooth surface, and the microstructures can reflect light.

4. The arc surface light source system according to claim 3, characterized in that, The microstructures are arc-shaped protrusions or arc-shaped depressions, and the microstructures are arranged in an array or randomly.

5. The arc surface light source system according to claim 3, characterized in that, It further comprises a protection plate (4), the protection plate (4) being a transparent arc-shaped plate, and the protection plate (4) being used to protect the microstructures.

6. A curved surface light source system according to any one of claims 1-5, characterized in that, The light guide plate (3) is a PMMA plate.

7. An arc surface light source system according to any one of claims 1-5, characterized in that It further comprises a radiator (5), and the radiator (5) is used for dissipating heat of the first light sources (1) and the second light sources (2).

8. A detection system, comprising an image acquisition device (6), characterized in that, It further comprises an arc-shaped surface light source system according to any one of claims 1-7.

9. A detection system according to claim 8, characterized in that, Two of the arc-shaped surface light source systems are symmetrically arranged on both sides of the object to be detected (7), and the light guide plate (3) is bent towards the object to be detected.

10. A detection system according to claim 9, characterized in that, A plurality of the image acquisition devices (6) are arranged at intervals along the circumference of the arc-shaped surface light source system, and the axis of the image acquisition device (6) is perpendicular to the arc-shaped surface of the light guide plate (3).

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