Visual inspection device
By using a backlight light source and annular light source assembly in the visual detection device, it ensures that the light illuminates the outer periphery of the workpiece in parallel, and solves the bright spot problem caused by inclined light irradiation in the prior art, and realizes high-precision detection of the outer edge profile of the workpiece.
Patent Information
- Application Number
- CN202422133038.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-30
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-08-30
AI Technical Summary
When the existing visual detection device detects the contour of the outer edge of the workpiece, the light from the backlight light source is easily tilted, causing bright spots to appear in the peripheral image of the workpiece, affecting the detection accuracy.
The backlight light source is adopted to include a first lamp board and a first Fresnel lens. The light emits parallelly along the central axis of the detection camera lens, and combines the annular light source assembly and the light spectrometer to ensure that the light illuminates the outer circumference of the workpiece in parallel to reduce the appearance of bright spots.
It improves the detection accuracy of the outer edge contour of the workpiece, reduces the highlights in the detection image, and improves the accuracy of visual detection.
Smart Images
Figure CN223166105U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of vision detection, in particular to a vision detection device. Background Art
[0002] In the current vision detection device, when detecting the outer contour of a workpiece, the light of the backlight source is likely to irradiate obliquely on the outer periphery of the workpiece. After the oblique light irradiates on the micro protrusions on the outer periphery of the workpiece and then enters the camera for imaging, there are likely to be bright spots on the outer peripheral edge of the workpiece image obtained by photographing, thus affecting the actual detection effect and being not conducive to improving the accuracy of detecting the contour of the workpiece.
[0003] In view of this, it is necessary to design a vision detection device that is conducive to improving the accuracy of detecting the contour of a workpiece. Summary of the Utility Model
[0004] The utility model provides a vision detection device, which is conducive to improving the accuracy of detecting the contour of a workpiece.
[0005] To achieve the above object, the utility model provides the following technical solutions:
[0006] A vision detection device, comprising:
[0007] A detection camera, arranged on one side of the top of the set detection station;
[0008] A backlight source, arranged on one side of the bottom of the set detection station, for emitting light towards the detection camera along a first direction, and the first direction is parallel to the central axis of the lens of the detection camera;
[0009] The backlight source includes a first lamp board and a first Fresnel lens arranged on the light-emitting side of the first lamp board.
[0010] Optionally, the vision detection device further includes an annular light source assembly surrounding the set detection station;
[0011] The annular light source assembly includes a support plate, as well as a second lamp board and a beam splitter both mounted on the support plate, and the beam splitter is located between the second lamp board and the set detection station; the second lamp board is used for emitting light towards the set detection station along a second direction, the light emitted by the second lamp board passes through the beam splitter and irradiates towards the set detection station, and the second direction is perpendicular to the first direction; the beam splitter is used for reflecting the outer peripheral image of the workpiece in the set detection station to the detection camera.
[0012] Optionally, the support plate is horizontally arranged, the beam splitter is inclined 45° relative to the support plate, and an absorbing plate is arranged on the side surface of the support plate close to the beam splitter;
[0013] The light absorbing plate is located directly below the beam splitter.
[0014] Optionally, the backlight source further includes a first diffusion plate, the first diffusion plate is located between the first lamp board and the first Fresnel lens, and the first diffusion plate is parallel to the first lamp board.
[0015] Optionally, the annular light source assembly further includes a second diffusion plate, the second diffusion plate is located between the second lamp board and the beam splitter, and the second diffusion plate is parallel to the second lamp board.
[0016] Optionally, the annular light source assembly further includes a second Fresnel lens, and the second Fresnel lens is located between the second light board and the beam splitter.
[0017] Optionally, the second light boards are provided in two pieces, and the two second light boards are symmetrically arranged with respect to the set detection station.
[0018] Optionally, at least three second light boards are provided, and all of the second light boards are arranged in a circular array around the set detection station.
[0019] Optionally, the visual inspection device further comprises a support frame for supporting the workpiece at the set inspection station.
[0020] Optionally, the highest point of the annular light source assembly is higher than the top surface of the workpiece in the set inspection station.
[0021] Compared with the prior art, the present invention has the following beneficial effects:
[0022] The utility model provides a visual inspection device for detecting the outer contour of a workpiece. The light emitted by the first light board is corrected by the first Fresnel lens and then emitted in parallel along the first direction. The light is parallel to the central axis of the lens of the detection camera, which reduces the possibility of bright spots appearing on the outer edge of the workpiece in the detection image, thereby facilitating the improvement of the accuracy of visual inspection and better detecting the outer contour of the workpiece.
[0023] The present invention has other features and advantages, which will be apparent from the accompanying drawings and subsequent detailed descriptions incorporated herein, or will be described in detail in the accompanying drawings and subsequent detailed descriptions incorporated herein, which together serve to explain the specific principles of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.
[0025] Figure 1 It is a schematic structural diagram of a visual detection device provided by an embodiment of the present invention.
[0026] Reference numerals: 1, detection camera; 2, backlight source; 21, first lamp board; 22, first Fresnel lens; 23, first diffuser plate; 3, annular light source assembly; 301, light absorbing plate; 31, support plate; 32, second lamp board; 33, beam splitter; 34, second diffuser plate; 35, second Fresnel lens. Detailed implementation manners
[0027] To elaborate in detail on the possible application scenarios, technical principles, feasible specific solutions, achievable objectives and effects, etc. of this application, the following will be described in detail in conjunction with the listed specific embodiments and the accompanying drawings. The embodiments recorded in this article are only used to more clearly illustrate the technical solutions of this application, so they are only examples and cannot be used to limit the protection scope of this application.
[0028] In this article, referring to "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of this application. The term "embodiment" appearing in various positions in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or relevance to other embodiments. In principle, in this application, 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 feasible technical solutions.
[0029] Unless otherwise defined, the meanings of the technical terms used in this article are the same as those generally understood by those skilled in the technical field to which this application belongs; the use of relevant terms in this article is only for describing specific embodiments and is not intended to limit this application.
[0030] In the description of this application, 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 this application, 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 quantitative, primary-secondary, or sequential relationships between these entities or operations.
[0032] Without further limitations, in this application, the expressions such as "comprising", "including", "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 that includes the said elements. Thus, in a process, method, or product that includes a series of elements, it can include not only those defined elements, but also other elements that are not explicitly listed, or elements that are inherent to such a process, method, or product.
[0033] Similar to the understanding in the "Examination Guidelines", in this application, expressions such as "greater than", "less than", "exceeding", etc. are understood not to include the recited number; expressions such as "above", "below", "within", etc. are understood to include the recited number. In addition, in the description of the embodiments of this application, 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 the same way, unless otherwise specifically defined.
[0034] In the description of the embodiments of this application, spatial-related expressions such as "center", "longitudinal", "lateral", "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. This is only for the convenience of describing the specific embodiments of this application or facilitating the understanding of the reader, 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 on the embodiments of this application.
[0035] Unless otherwise clearly specified or limited, in the description of the embodiments of this application, terms such as "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 art to which this application pertains, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.
[0036] In view of the defects existing in the above-mentioned existing vision detection devices, based on the rich practical experience and professional knowledge in the design and manufacture of such products for many years by the applicant, and in combination with the application of theory, the applicant actively conducts research and innovation, hoping to create a technology that can solve the defects in the prior art, making the vision detection device more practical. After continuous research, design, and repeated trial production of samples and improvement, the present utility model with practical value is finally created.
[0037] Please refer to Figure 1 , an embodiment of the present utility model provides a vision detection device, including: a detection camera 1, arranged on one side at the top of a set detection station, for taking pictures and detecting directly above a workpiece 100; a backlight source 2, arranged on one side at the bottom of the set detection station, for emitting light towards the detection camera 1 along a first direction, and the first direction is parallel to the central axis of the lens of the detection camera 1; the set detection station is located between the backlight source 2 and the detection camera 1, so that the detection camera 1 can better detect whether there are serrated protrusions or protrusions of other shapes on the outer edge contour of the workpiece 100, improving the accuracy of detection. Figure 1 In , the first direction is the vertically upward direction.
[0038] As Figure 1 , the backlight source 2 includes a first lamp board 21 and a first Fresnel lens 22 arranged on the light-emitting side of the first lamp board 21. The first Fresnel lens 22 is used to form parallel light from the light emitted by the first lamp board 21 and emit it upward, so as to emit light towards the workpiece 100 along the first direction. As Figure 1 In , the first direction is the vertically upward direction.
[0039] It should be particularly noted that when the backlight is incident obliquely on the outer peripheral surface of the workpiece 100, the protrusions on the outer peripheral surface of the workpiece 100 will reflect light, so that it is easy to reflect the light into the detection camera 1, resulting in local bright spots in the detection image of the detection camera 1. In this embodiment, the backlight source emits light along the central axis of the lens, so that the light is not easily reflected into the lens, effectively reducing the bright spots in the detection image and being beneficial to improving the detection accuracy of the contour of the workpiece 100.
[0040] It should also be particularly noted that the workpiece 100 is generally a columnar workpiece 100, and when the workpiece 100 is placed at the set detection station, the central axis of the workpiece 100 is parallel to the central axis of the lens. Preferably, the central axis of the workpiece 100 coincides with the central axis of the lens.
[0041] Optionally, the visual detection device further includes an annular light source assembly 3 surrounding the set detection station; the annular light source assembly 3 includes a support plate 31, and a second light board 32 and a beam splitter 33 both mounted on the support plate 31, and the beam splitter 33 is located between the second light board 32 and the set detection station; the second light board 32 is used to emit light towards the set detection station along a second direction, the light emitted by the second light board 32 passes through the beam splitter 33 and is projected towards the set detection station, and the second direction is perpendicular to the first direction; the beam splitter 33 is used to reflect the peripheral image of the workpiece 100 in the set detection station to the detection camera 1.
[0042] In this embodiment, using one camera can meet the need of detecting the outer contour and the outer peripheral surface of the workpiece 100. There is no need to set more cameras, which is beneficial to saving the cost of the visual detection device and meeting the need of detecting the outer peripheral surface of the workpiece 100.
[0043] Optionally, the support plate 31 is horizontally arranged, the beam splitter 33 is inclined 45° relative to the support plate 31, and an absorbing plate 301 is arranged on the side surface of the support plate 31 close to the beam splitter 33; the absorbing plate 301 is located directly below the beam splitter 33. The absorbing plate 301 can reduce the stray light image projected towards the detection camera 1, which is beneficial to improving the imaging quality of the detection camera 1.
[0044] Optionally, the backlight source 2 further includes a first diffuser plate 23, the first diffuser plate 23 is located between the first light board 21 and the first Fresnel lens 22, and the first diffuser plate 23 is parallel to the first light board 21. Specifically, the first diffuser plate 23 converts the point and line light sources on the first light board 21 into a soft and uniform surface light source, improving the uniformity of the light emitted by the first light board 21.
[0045] Optionally, the annular light source assembly 3 further includes a second diffuser plate 34, the second diffuser plate 34 is located between the second light board 32 and the beam splitter 33, and the second diffuser plate 34 is parallel to the second light board 32.
[0046] Optionally, the annular light source assembly 3 further includes a second Fresnel lens 35, the second Fresnel lens 35 is located between the second light board 32 and the beam splitter 33. Similarly, the second Fresnel lens 35 is used to improve the uniformity and softness of the light source emitted by the annular light source assembly 3, thereby facilitating the improvement of the accuracy of visual detection.
[0047] Optionally, there are two second light boards 32, and the two second light boards 32 are symmetrically arranged with respect to the set detection station.
[0048] Optionally, there are at least three second light boards 32, and all the second light boards 32 are arranged in a circumferential array around the set detection station.
[0049] Optionally, the vision detection device further includes a support frame for supporting the workpiece 100 at a set detection station. Generally, the support frame is a transparent support frame or a hollowed-out support frame.
[0050] Optionally, the highest point of the annular light source assembly 3 is higher than the top surface of the workpiece 100 at the set detection station. Preferably, the height difference between the highest point of the annular light source assembly 3 and the top surface of the workpiece 100 at the set detection station is not greater than 5 mm. This can effectively prevent light from shining on the top surface of the workpiece 100 and improve the detection accuracy of the outer edge contour of the workpiece 100, especially the columnar workpiece 100.
[0051] Finally, it should be noted that although the above embodiments have been described in the text and drawings of the specification of the present application, the patent protection scope of the present application cannot be limited thereby. Any technical solutions generated by equivalent structure or equivalent process substitution or modification using the content recorded in the text and drawings of the specification of the present application based on the essential concept of the present application, as well as the technical solutions of the above embodiments directly or indirectly implemented in other related technical fields, etc., are all included in the patent protection scope of the present application.
Claims
1. A visual detection device, characterized in that, Including: A detection camera (1), arranged on the top side of a set detection station; A backlight source (2), arranged on the bottom side of the set detection station, for emitting light towards the detection camera (1) along a first direction, and the first direction is parallel to the central axis of the lens of the detection camera (1); The backlight source (2) includes a first lamp board (21) and a first Fresnel lens (22) arranged on the light-emitting side of the first lamp board (21).
2. The visual detection device according to claim 1, wherein It further includes an annular light source assembly (3) surrounding the set detection station; The annular light source assembly (3) includes a support plate (31), and a second lamp board (32) and a beam splitter (33) both installed on the support plate (31), and the beam splitter (33) is located between the second lamp board (32) and the set detection station; the second lamp board (32) is used for emitting light towards the set detection station along a second direction, the light emitted by the second lamp board (32) passes through the beam splitter (33) and shoots towards the set detection station, and the second direction is perpendicular to the first direction; the beam splitter (33) is used for reflecting the peripheral image of the workpiece in the set detection station to the detection camera (1).
3. The visual inspection device according to claim 2, wherein The support plate (31) is horizontally arranged, the beam splitter (33) is inclined 45° relative to the support plate (31), and an absorbent plate (301) is arranged on the side surface of the support plate (31) close to the beam splitter (33); The absorbent plate (301) is located directly below the beam splitter (33).
4. The visual inspection device according to claim 1, wherein The backlight source (2) further includes a first diffuser plate (23), the first diffuser plate (23) is located between the first lamp board (21) and the first Fresnel lens (22), and the first diffuser plate (23) is parallel to the first lamp board (21).
5. The visual inspection device according to claim 2, wherein The annular light source assembly (3) further includes a second diffuser plate (34), the second diffuser plate (34) is located between the second lamp board (32) and the beam splitter (33), and the second diffuser plate (34) is parallel to the second lamp board (32).
6. The visual detection device according to claim 2, wherein, The annular light source assembly (3) further includes a second Fresnel lens (35), the second Fresnel lens (35) is located between the second lamp board (32) and the beam splitter (33).
7. The visual inspection device according to claim 2, characterized in that, There are two second lamp boards (32), and the two second lamp boards (32) are symmetrically arranged with respect to the set detection station.
8. The visual inspection device according to claim 2, characterized in that, There are at least three second lamp boards (32), and all the second lamp boards (32) are arranged in a circumferential array around the set detection station.
9. The visual detection device according to claim 1, characterized in that It further includes a support frame for supporting the workpiece at the set detection station.
10. The visual inspection device according to claim 2, wherein The highest point of the annular light source assembly (3) is higher than the top surface of the workpiece in the set detection station.