CN216350393U

CN216350393U - Coaxial detection light source

Info

Publication number: CN216350393U
Application number: CN202122654249.2U
Authority: CN
Inventors: 钟超
Original assignee: Guangdong OPT Machine Vision Co Ltd
Current assignee: Guangdong OPT Machine Vision Co Ltd
Priority date: 2021-11-01
Filing date: 2021-11-01
Publication date: 2022-04-19
Anticipated expiration: 2031-11-01

Abstract

The utility model discloses a coaxial detection light source which comprises a light source shell, wherein the bottom of the light source shell is provided with a light outlet, the top of the light source shell is provided with a shooting window, and the shooting window is aligned to the light outlet; a lamp panel is arranged on the side face of the light source shell, a spectroscope is arranged along a light emitting path of the lamp panel, and the spectroscope is arranged obliquely to the light emitting path, so that emergent light rays of the lamp panel are reflected by the spectroscope to form first reflected light rays which are emitted into the light outlet; the coaxial detection light source further comprises: the emergent light of the lamp panel is refracted by the spectroscope to form refracted light which enters the first extinction surface. According to the utility model, the first extinction surface is arranged in the coaxial light source, so that the light refracted by the spectroscope is eliminated, interference light is avoided, the uniformity of the light irradiated on the surface to be detected is ensured, and the accuracy of defect detection is improved.

Description

Coaxial detection light source

Technical Field

The utility model relates to the technical field of machine vision, in particular to a coaxial detection light source.

Background

In order to ensure the production quality of products, the defect detection is required in the production process, the machine vision detection is the detection technology which is most widely applied at present, the machine vision detection is a method for realizing detection by using a machine to replace human eyes, and the machine vision detection combines the technologies in multiple fields of optics, machinery, computers and the like and has more accurate detection effect than the human eyes.

When the machine vision detection is carried out, a light source is used for irradiating the surface of a product to be detected, then the camera is used for shooting and imaging, and finally the processing and analysis are carried out in a computer to obtain defect characteristics, wherein the coaxial light source has a more uniform irradiation effect and becomes one of the most commonly used light sources in a vision detection system. The coaxial light source is including the lamp plate that is used for launching parallel light to and set up the beam splitter on lamp plate light-emitting path, utilize the beam splitter reflection to waiting to detect the product surface. Because the spectroscope is a half-transmitting half-reflecting mirror, part of light rays cannot be reflected to a product to be detected, and the part of light rays can cause interference on detection, and the accuracy of a detection result is influenced.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model provides a coaxial light source device, which solves the problems that the coaxial light source in the prior art has interference light rays, so that the interference on detection is caused, and the accuracy of a detection result is influenced.

In order to achieve the above purpose, the present invention provides the following technical solutions:

a coaxial detection light source comprises a light source shell, wherein the bottom of the light source shell is provided with a light outlet, the top of the light source shell is provided with a shooting window, and the shooting window is aligned to the light outlet;

a lamp panel is arranged on the side face of the light source shell, a spectroscope is arranged along a light emitting path of the lamp panel, and the spectroscope is arranged obliquely to the light emitting path, so that emergent light rays of the lamp panel are reflected by the spectroscope to form first reflected light rays which are emitted into the light outlet;

the coaxial detection light source further comprises:

the emergent light of the lamp panel is refracted by the spectroscope to form refracted light which enters the first extinction surface.

Optionally, the coaxial detection light source further includes:

and the refracted light rays are reflected by the first extinction surface to form second reflected light rays which are emitted into the second extinction surface.

Optionally, the surfaces of the first and second matt surfaces are coated with a matting paint.

Optionally, the surfaces of the first and second extinction surfaces are both provided with an extinction structure layer.

Optionally, the matting structure layer is a particle layer.

Optionally, the particle layer has a uniform distribution of carbon black particles.

Optionally, the extinction structure layer is a thread layer, and the thread layer is provided with extinction threads distributed uniformly.

Optionally, the matt thread is a tapered thread.

Optionally, the first extinction surface is disposed parallel to the beam splitter.

Optionally, the included angle between the spectroscope and the first extinction surface and the light exit path of the lamp panel is 45 degrees;

the included angle between the second extinction surface and the first extinction surface is 45 degrees.

Compared with the prior art, the utility model has the following beneficial effects:

the utility model provides a coaxial detection light source, which is characterized in that a first extinction surface is arranged in the coaxial light source, so that light rays refracted by a spectroscope are eliminated, interference light rays are avoided, the uniformity of the light rays irradiated onto a detected surface is ensured, and the accuracy of defect detection is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a cross-sectional view of a coaxial detection light source provided by the present invention.

In the above figures: 10. a light source housing; 101. a light outlet; 102. a shooting window; 11. a lamp panel; 12. a diffusion plate; 13. a beam splitter; 21. a first extinction surface; 22. a second extinction surface.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.

Furthermore, the terms "long", "short", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention, but do not indicate or imply that the referred devices or elements must have the specific orientations, be configured to operate in the specific orientations, and thus are not to be construed as limitations of the present invention.

Compared with the traditional light source, the coaxial light source has higher light-emitting uniformity, can highlight the unevenness of the surface of an object, overcomes the interference caused by surface reflection, reduces the transmittance of a transparent shell or a covering, is mainly used for detecting the bruise, scratch, crack and foreign matter of the flat and smooth surface of the object, and realizes the detection and reference positioning of an electronic element.

However, in the coaxial light source, a large part of light generated by the lamp panel cannot be emitted to the surface to be detected after being refracted by the spectroscope, so that interference light is easily formed, the contrast between the defect characteristics and the light reflecting surface is weakened, and the detection effect is influenced.

In view of the above, the present invention is directed to a coaxial detection light source to overcome the above-mentioned problems in the prior art.

The technical scheme of the utility model is further explained by the specific implementation mode in combination with the attached drawings.

Referring to fig. 1, the present invention provides a coaxial detection light source, including:

the light source comprises a light source shell 10, wherein a light outlet 101 is formed in the bottom of the light source shell 10, a shooting window 102 is formed in the top of the light source shell 10, and the shooting window 102 is arranged in a manner of aligning to the light outlet 101; the side of the light source housing 10 is provided with a lamp panel 11, and a diffusion plate 12 and a spectroscope 13 are sequentially arranged along a light emitting path of the lamp panel 11.

The beam splitter 13 is arranged obliquely to the light exit path, so that the emergent light of the lamp panel 11 is reflected by the beam splitter 13 to form a first reflected light entering the light exit 101; the surface to be detected is aligned with the light outlet 101, the lens is aligned with the shooting window 102, and the surface to be detected can be detected after the lamp panel 11 is lighted.

Further, the coaxial detection light source provided by this embodiment further includes:

the first extinction surface 21, the emergent ray of the lamp panel 11 is refracted by the spectroscope 13, form and inject into the refraction ray of the first extinction surface 21, after the emergent ray of the lamp panel 11 is injected into the first extinction surface 21, absorb a part by the first extinction surface 21, achieve the effect of eliminating stray light preliminarily;

the first extinction surface 21 is parallel to the spectroscope 13, and the included angles between the spectroscope 13 and the first extinction surface 21 and the light exit path of the lamp panel 11 are both 45 °.

A second extinction surface 22, wherein the refracted light is reflected by the first extinction surface 21 to form a second reflected light which enters the second extinction surface 22; the refracted light after being absorbed and weakened by the first extinction surface 21 and then enters the second extinction surface 22 can be basically and completely eliminated, so that stray light is effectively prevented from escaping from the light outlet 101 after being reflected for multiple times to form interference on defect detection;

wherein, the included angle between the second extinction surface 22 and the first extinction surface 21 is 45 °.

In this embodiment, the surfaces of the first and

second extinction surfaces

21 and 22 are coated with a matt black matt varnish, which can be effectively absorbed when light is incident on the surface of the matt black matt varnish.

In addition, in this embodiment, the surfaces of the first and second light-eliminating

surfaces

21 and 22 may be further provided with an extinction structure layer for further enhancing the light absorption effect.

In one embodiment of this embodiment, the matte structure layer is a particle layer.

Specifically, the particle layer has uniformly distributed carbon black particles, the particle size of the carbon black particles can be 0.5-1 μm, and the absorption of light on the first extinction surface 21 and the second extinction surface 22 can be effectively enhanced by the cooperation of the carbon black particles and the matting paint.

In another embodiment of this embodiment, the matt structured layer is a thread layer having a uniform distribution of matt threads.

Specifically, the extinction thread is a tapered thread, so that the surfaces of the first extinction surface 21 and the second extinction surface 22 form uniformly distributed toothed surfaces, and when light enters, the light is gradually weakened through diffuse reflection of the extinction thread to gradually disappear, and the purpose of extinction is achieved.

The utility model provides a coaxial detection light source, which is characterized in that a first extinction surface 21 and a second extinction surface 22 are arranged in the coaxial light source, so that light rays refracted by a spectroscope 13 are eliminated, interference light rays are avoided, the uniformity of the light rays irradiated to a detected surface is ensured, and the accuracy of defect detection is improved.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. The coaxial detection light source is characterized by comprising a light source shell (10), wherein a light outlet (101) is formed in the bottom of the light source shell (10), a shooting window (102) is formed in the top of the light source shell (10), and the shooting window (102) is aligned to the light outlet (101);

a lamp panel (11) is arranged on the side surface of the light source shell (10), a spectroscope (13) is arranged along a light emitting path of the lamp panel (11), and the spectroscope (13) is arranged obliquely to the light emitting path, so that emergent light of the lamp panel (11) is reflected by the spectroscope (13) to form first reflected light which enters the light outlet (101);

the coaxial detection light source further comprises:

the emergent light of the lamp panel (11) is refracted by the spectroscope (13) to form refracted light which enters the first extinction surface (21).

2. The coaxial detection light source of claim 1, further comprising:

and the second light-eliminating surface (22) reflects the refracted light rays through the first light-eliminating surface (21) to form second reflected light rays which are emitted into the second light-eliminating surface (22).

3. The coaxial detection light source of claim 2, characterized in that the surfaces of the first (21) and second (22) matt surface are coated with a matt varnish.

4. The coaxial detection light source of claim 2, characterized in that the surfaces of the first (21) and second (22) extinction surfaces are provided with an extinction structure layer.

5. The coaxial detection light source of claim 4, wherein the extinction structure layer is a granular layer.

6. The coaxial detection light source of claim 5, wherein the particle layer has a uniform distribution of carbon black particles.

7. The coaxial detection light source of claim 4, wherein the extinction structure layer is a thread layer having evenly distributed extinction threads.

8. The coaxial detection light source of claim 7, wherein the matte thread is a tapered thread.

9. The coaxial detection light source according to claim 1, characterized in that the first extinction surface (21) is arranged parallel to the beam splitter (13).

10. The coaxial detection light source of claim 2, wherein the beam splitter (13) and the first extinction surface (21) are both at an angle of 45 ° with respect to the light exit path of the lamp panel (11);

the included angle between the second extinction surface (22) and the first extinction surface (21) is 45 degrees.