Shadowless light source and visual inspection system

Abstract

The utility model relates to the technical field of light source equipment, and particularly discloses a shadowless light source and a visual inspection system, comprising a light source base, the bottom surface of which is an arc-shaped diffuse reflection surface arched upwards; the annular luminous body is fixedly arranged at the edge position of the arc-shaped diffuse reflection surface; wherein a part of light rays emitted by the annular luminous body directly irradiate a workpiece to be detected, and a part of light rays emitted by the annular luminous body irradiate the workpiece to be detected after being reflected by the arc-shaped diffuse reflection surface. The shadowless light source and the visual inspection system provided by the utility model can effectively solve the problem that the existing light source device cannot uniformly irradiate the workpiece to be detected from multiple angles by using fewer luminous bodies.

Description

Technical Field

[0001] The utility model relates to the technical field of light source devices, in particular to a shadowless light source and a vision inspection system. Background Art

[0002] When using a vision module to perform vision inspection on a workpiece to be measured, it is usually necessary to use a light source device to irradiate the workpiece to be measured to improve the surface brightness of the workpiece to be measured. When the number of light-emitting bodies (such as LED lamp beads, etc.) included in the light source device is small, it is impossible to arrange light-emitting bodies at multiple positions, so the light source device cannot irradiate the workpiece to be measured from multiple angles, and it is easy to generate shadows when irradiating the workpiece to be measured, ultimately affecting the accuracy of vision inspection.

[0003] If the number of light-emitting bodies included in the light source device is large, such as a matrix light source device, although it can irradiate the workpiece to be measured from multiple angles, thereby avoiding the problem of uneven irradiation resulting in shadows. However, too many light-emitting bodies are likely to cause a large amount of heat generation, ultimately burning out the light source device.

[0004] Therefore, it is necessary to improve the existing light source device to solve the problem that it cannot uniformly irradiate the workpiece to be measured from multiple angles with fewer light-emitting bodies.

[0005] The above information disclosed in this background section is only included to enhance the understanding of the background of the present disclosure, and thus may include information that does not form the prior art already known to those of ordinary skill in the art at present. Summary of the Utility Model

[0006] An object of the utility model is to provide a shadowless light source and a vision inspection system, which can effectively solve the problem that the existing light source device cannot uniformly irradiate the workpiece to be measured from multiple angles with fewer light-emitting bodies.

[0007] To achieve the above object, on the one hand, the utility model provides a shadowless light source, including:

[0008] A light source base, the bottom surface of the light source base is an upwardly arched arc-shaped diffuse reflection surface;

[0009] An annular light-emitting body, the annular light-emitting body is fixedly arranged at the edge position of the arc-shaped diffuse reflection surface;

[0010] Wherein, part of the light emitted by the annular light-emitting body directly irradiates the workpiece to be measured, and part of the light emitted by the annular light-emitting body is reflected by the arc-shaped diffuse reflection surface and then irradiates the workpiece to be measured.

[0011] Optionally, the annular light-emitting body includes an annular lamp cover surrounding to form an annular lamp cavity and lamp beads located in the annular lamp cavity and emitting light downward.

[0012] Optionally, the annular lamp cover includes an inner vertical portion, an outer vertical portion located outside the inner vertical portion, and a transition portion connecting the outer vertical portion and the inner vertical portion.

[0013] Optionally, the height dimension of the inner vertical portion is smaller than the height dimension of the outer vertical portion, and the transition portion is an arc structure arched towards the workpiece to be measured.

[0014] Optionally, both the inner vertical portion and the transition portion are diffusion plates.

[0015] Optionally, the surface of the outer vertical portion close to the inner vertical portion is a mirror total reflection surface.

[0016] Optionally, the light source base is a metal part, and the lamp beads are fixed on the light source base.

[0017] Optionally, the light source base is provided with a plurality of heat dissipation fins.

[0018] On the other hand, a vision inspection system is provided, including the shadowless light source as described above and a vision module for acquiring image information of the workpiece to be measured.

[0019] Optionally, a detection hole for detecting the workpiece to be measured is provided at the middle position of the light source base of the shadowless light source, and the vision module is located directly above the detection hole.

[0020] The beneficial effects of the present utility model are as follows: A shadowless light source and a vision inspection system are provided. Part of the light emitted by the annular light-emitting body directly irradiates the workpiece to be measured obliquely downward, thereby illuminating the side surface of the workpiece to be measured; part of the light emitted by the annular light-emitting body first irradiates the arc-shaped diffuse reflection surface obliquely upward, and after being reflected by the arc-shaped diffuse reflection surface, it evenly illuminates the top surface of the workpiece to be measured downward. Thus, the top surface and bottom surface of the workpiece to be measured can be evenly irradiated from multiple angles such as the top surface and side surface of the workpiece to be measured, and only an annular light-emitting body needs to be provided, without the need to provide a light-emitting body directly above the workpiece to be measured, effectively reducing the number of light-emitting bodies, and thus reducing the heat generation.

[0021] Therefore, the shadowless light source and the vision inspection system provided by the present utility model can effectively solve the problem that the existing light source device cannot evenly irradiate the workpiece to be measured from multiple angles with fewer light-emitting bodies. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 Structural schematic diagram of the shadowless light source provided for the embodiment.

[0024] In the figure:

[0025] 100, workpiece to be measured;

[0026] 1, light source base; 101, arc-shaped diffuse reflection surface; 102, detection hole; 103, heat dissipation fins;

[0027] 2, annular light-emitting body; 201, annular lamp shade; 2011, inner vertical part; 2012, outer vertical part; 2013, transition part; 202, lamp beads. Specific embodiments

[0028] In the present invention, the mention of "embodiment" means that the specific features, structures or characteristics described in combination with the embodiment can be included in at least one embodiment of the present invention. The term "embodiment" appearing at various positions in the specification does not necessarily refer to the same embodiment, nor is it particularly limited to the independence or relevance between other embodiments. In principle, in the present invention, as long as there is no technical contradiction or conflict, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0029] Unless otherwise defined, the meanings of the technical terms used herein are the same as those commonly understood by those skilled in the technical field to which the present invention belongs; the use of the relevant terms herein is only for describing specific embodiments and is not intended to limit the present invention.

[0030] In the description of the present invention, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: there is A, there is B, and there is both A and B at the same time. In addition, the character " / " in this article generally represents an "or" logical relationship between the associated objects before and after.

[0031] In the present invention, terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantity, primary-secondary or order relationship between these entities or operations.

[0032] Without further limitations, in the present utility model, the terms "including", "comprising", "having" or other similar expressions used in a statement are intended to cover non-exclusive inclusion. These expressions do not exclude the possibility that there may be additional elements in the process, method or product including the said elements. Thus, in a process, method or product including a series of elements, it may include not only those defined elements, but also other elements not explicitly listed, or elements inherent to such a process, method or product.

[0033] Similar to the understanding in the "Examination Guidelines", in the present utility model, expressions such as "greater than", "less than", "exceeding" are understood as not including the present number; expressions such as "above", "below", "within" are understood as including the present number. In addition, in the description of the embodiments of the present utility model, the meaning of "a plurality of" is two or more (including two). Similar expressions related to "many", such as "multiple groups", "multiple times", etc., are understood in this way, unless otherwise specifically defined.

[0034] In the description of the embodiments of the present utility model, the spatially related expressions used, such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "perpendicular", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiment or the drawing. It is only for the convenience of describing the specific embodiments of the present utility model or for the reader's understanding, rather than indicating or implying that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, it should not be construed as a limitation to the embodiments of the present utility model.

[0035] Unless otherwise clearly specified or limited, in the description of the embodiments of the present utility model, the terms "installed", "connected", "joined", "fixed", "set", etc. should be understood in a broad sense. For example, the said "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the technical field to which the present utility model belongs, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to the specific circumstances.

[0036] The present utility model provides a shadowless light source and a vision detection system, which are applicable to the application scenario of performing shadowless illumination on a workpiece to complete vision detection, and can effectively solve the problem that the existing light source device cannot evenly illuminate the workpiece to be measured from multiple angles with fewer light emitters.

[0037] In this embodiment, the visual inspection system includes a shadowless light source for illuminating the workpiece to be inspected, and a visual module for acquiring image information of the workpiece to be inspected.

[0038] See also Figure 1 The shadowless light source comprises a light source base 1 and an annular light emitter 2. The bottom surface of the light source base 1 is an arc-shaped diffuse reflection surface 101 that arches upward, and the annular light emitter 2 is fixedly arranged at the edge of the arc-shaped diffuse reflection surface 101. Part of the light emitted by the annular light emitter 2 directly illuminates the workpiece 100 to be measured, and part of the light emitted by the annular light emitter 2 is reflected by the arc-shaped diffuse reflection surface 101 and then illuminates the workpiece 100 to be measured.

[0039] In the shadowless light source and visual inspection system provided by the present embodiment, part of the light emitted by the annular light source 2 is directly irradiated obliquely downward onto the workpiece to be measured 100, thereby illuminating the side of the workpiece to be measured 100; part of the light emitted by the annular light source 2 is first irradiated obliquely upward onto the arc-shaped diffuse reflection surface 101, and after being reflected by the arc-shaped diffuse reflection surface 101, it evenly illuminates the top surface of the workpiece to be measured 100 downward, thereby the top surface and bottom surface of the workpiece to be measured 100 can be evenly illuminated from multiple angles such as the top surface and side surface of the workpiece to be measured 100, and only the annular light source 2 needs to be set, and there is no need to set a light source directly above the workpiece to be measured 100, which effectively reduces the number of light sources and thus reduces the heat generation.

[0040] Therefore, the shadowless light source and visual inspection system provided by the present invention can effectively solve the problem that the existing light source device cannot use fewer light sources to uniformly illuminate the workpiece 100 to be inspected from multiple angles.

[0041] In this embodiment, a detection hole 102 for detecting the workpiece 100 is provided in the middle of the light source base 1 of the shadowless light source, and the visual module is located directly above the detection hole 102 so as to perform visual inspection on the workpiece 100 through the detection hole 102 .

[0042] The annular illuminator 2 includes an annular lampshade 201 surrounding an annular lamp cavity and a lamp bead 202 located in the annular lamp cavity and emitting light downward. The light source base 1 is a metal part, and the lamp bead 202 is fixed on the light source base 1 so that the light source base 1 can dissipate heat for the lamp bead 202.

[0043] Optionally, the light source base 1 is provided with a plurality of heat dissipation fins 103 to improve the heat dissipation efficiency and avoid the lamp beads 202 from overheating as much as possible.

[0044] In this embodiment, the annular lamp cover 201 includes an inner vertical portion 2011, an outer vertical portion 2012 located outside the inner vertical portion 2011, and a transition portion 2013 connecting the outer vertical portion 2012 and the inner vertical portion 2011. Further, the height dimension of the inner vertical portion 2011 is smaller than the height dimension of the outer vertical portion 2012, and the transition portion 2013 is an arc structure arched toward the workpiece 100 to be measured.

[0045] Optionally, both the inner vertical portion 2011 and the transition portion 2013 are diffusion plates; the surface of the outer vertical portion 2012 close to the inner vertical portion 2011 is a mirror total reflection surface.

[0046] Part of the light emitted by the lamp beads 202 directly irradiates on the inner vertical portion 2011 and the transition portion 2013, and the other part irradiates on the outer vertical portion 2012. The light irradiating on the outer vertical portion 2012 is reflected by the mirror total reflection surface and is all reflected onto the inner vertical portion 2011 and the transition portion 2013. Therefore, the light in the annular lamp cavity finally emits outwards through the inner vertical portion 2011 and the transition portion 2013.

[0047] Further, part of the light irradiating on the vertical portion can directly irradiate obliquely downwards on the workpiece 100 to be measured, and the other part will irradiate obliquely upwards on the arc-shaped diffuse reflection surface 101. After the diffuse reflection of the arc-shaped diffuse reflection surface 101, the entire arc-shaped diffuse reflection surface 101 is evenly illuminated, and then evenly irradiates the workpiece 100 from top to bottom, so that the top surface of the workpiece 100 to be measured is illuminated;

[0048] Most of the light irradiating on the transition portion 2013 directly irradiates obliquely downwards at the side position of the workpiece 100 to be measured, and then illuminates the side surface of the workpiece 100 to be measured, thereby realizing shadowless illumination.

[0049] In summary, the shadowless light source and the vision detection system provided in this embodiment have the following advantages: Part of the light emitted by the annular light-emitting body 2 directly irradiates obliquely downwards on the workpiece 100 to be measured, and then illuminates the side surface of the workpiece 100 to be measured; Part of the light emitted by the annular light-emitting body 2 first irradiates obliquely upwards on the arc-shaped diffuse reflection surface 101, and after being reflected by the arc-shaped diffuse reflection surface 101, it evenly illuminates the top surface of the workpiece 100 to be measured downwards. Thus, the top surface and the bottom surface of the workpiece 100 to be measured can be evenly irradiated from multiple angles such as the top surface and the side surface of the workpiece 100 to be measured, and only the annular light-emitting body 2 needs to be provided, without arranging a light-emitting body directly above the workpiece 100 to be measured, effectively reducing the number of light-emitting bodies, and further reducing the heat generation.

[0050] Finally, it should be noted that although the above embodiments have been described in the text and drawings of the specification of this application, the patent protection scope of this application cannot be limited thereby. Any technical solutions obtained by equivalent structure or equivalent process substitution or modification based on the essential concept of this application and using the content recorded in the text and drawings of the specification of this application, as well as directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, etc., are all included in the patent protection scope of this application.

Claims

1. A shadowless light source, characterized in that: include: A light source base (1), wherein the bottom surface of the light source base (1) is an upwardly arched arc-shaped diffuse reflection surface (101); An annular light emitting body (2), the annular light emitting body (2) being fixedly arranged at an edge position of the arc-shaped diffuse reflection surface (101); Part of the light emitted by the annular light emitting body (2) directly illuminates the workpiece (100) to be measured, and part of the light emitted by the annular light emitting body (2) is reflected by the arc-shaped diffuse reflection surface (101) and then illuminates the workpiece (100) to be measured.

2. The shadowless light source according to claim 1, characterized in that: The annular light source (2) comprises an annular lamp cover (201) surrounding an annular lamp cavity, and a lamp bead (202) located in the annular lamp cavity and emitting light downwards.

3. The shadowless light source according to claim 2, characterized in that: The annular lampshade (201) comprises an inner vertical portion (2011), an outer vertical portion (2012) located outside the inner vertical portion (2011), and a transition portion (2013) connecting the outer vertical portion (2012) and the inner vertical portion (2011).

4. The shadowless light source according to claim 3, characterized in that: The height dimension of the inner vertical portion (2011) is smaller than the height dimension of the outer vertical portion (2012), and the transition portion (2013) is an arc structure arched toward the workpiece (100) to be measured.

5. The shadowless light source according to claim 4, characterized in that: The inner vertical portion (2011) and the transition portion (2013) are both diffuser plates.

6. The shadowless light source according to claim 4, characterized in that: The surface of the outer vertical portion (2012) close to the inner vertical portion (2011) is a mirror-like total reflection surface.

7. The shadowless light source according to claim 2, characterized in that: The light source base (1) is a metal part, and the lamp bead (202) is fixed on the light source base (1).

8. The shadowless light source according to claim 1, characterized in that: The light source base (1) is provided with a plurality of heat dissipation fins (103).

9. A visual inspection system, characterized in that: It comprises the shadowless light source as described in any one of claims 1 to 8, and a visual module for acquiring image information of a workpiece (100) to be measured.

10. The visual inspection system according to claim 9, characterized in that: A detection hole (102) for detecting a workpiece (100) to be detected is provided in the middle of the light source base (1) of the shadowless light source, and the visual module is located directly above the detection hole (102).

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