CN118011712A

CN118011712A - Combined light source and machine vision detection device

Info

Publication number: CN118011712A
Application number: CN202410316492.9A
Authority: CN
Inventors: 陈灵铭
Original assignee: Guangdong OPT Machine Vision Co Ltd
Current assignee: Guangdong OPT Machine Vision Co Ltd
Priority date: 2024-03-19
Filing date: 2024-03-19
Publication date: 2024-05-10

Abstract

The invention discloses a combined light source and a machine vision detection device, wherein the combined light source comprises a light source shell, and the light source shell is internally provided with: the first light-emitting component and the second light-emitting component are arranged in a light-emitting path of a first lamp panel in the first light-emitting component, and a first diffusion device is arranged in a light-emitting path of a second lamp panel in the second light-emitting component; the third light-emitting assembly and the fourth light-emitting assembly are sequentially provided with a second grating and a light-gathering rod on the light-emitting path of the third lamp panel in the third light-emitting assembly; a second diffusion device is arranged on the light-emitting path of the fourth lamp panel in the fourth light-emitting assembly; the overlapped light path section of the third light path and the fourth light path is provided with a light splitting device which can be driven to be switched to a first position to guide the third light path to be shot into the detected area or switched to a second position to guide the fourth light path to be shot into the detected area. The combination and the switching use of a plurality of light sources are adopted to adapt to different application scenes, and the problem of limitation of the current single light source detection scene is solved.

Description

Combined light source and machine vision detection device

Technical Field

The invention relates to the technical field of machine vision detection, in particular to a combined light source and a machine vision detection device.

Background

Machine vision refers to a technology that utilizes a computer and corresponding sensor technology to simulate the human visual system and to implement analysis and processing of image or video data. With the wide application of machine vision in various fields, the requirements for light sources are also increasing.

In the field of machine vision, a light source is one of the important components in acquiring image information. However, different detection scenarios typically require different types, angles, or intensities of light sources to provide appropriate illumination conditions in order to ensure efficient image acquisition and object detection. Conventional machine vision systems often use a single light source to provide illumination. However, in some special scenarios, a single light source may not provide enough light or correct angles, resulting in poor image quality or an inability to accurately detect the target object; second, different objects or surface materials may have different characteristics for reflecting and absorbing light. Therefore, there are some limitations to detecting a scene with a single light source.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a combined light source and a machine vision detection device, which solve the problem that a single light source in the prior art has some limitations in detecting a scene.

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

A combined light source comprises a light source shell, wherein a first window for aligning to a detected area and a second window for aligning to a shooting device are arranged on the light source shell, and the first window and the second window are coaxial; the light source shell is internally provided with:

The first light-emitting assembly comprises a first lamp panel used for emitting a first light path, a first grating is arranged on the light-emitting path of the first lamp panel, and the first light path vertically emits into the region to be detected through the first grating; the second light emitting assembly comprises a second lamp panel used for emitting a second light path, a first diffusion device is arranged on the light emitting path of the second lamp panel, and the second light path is obliquely emitted into the detected area through the first diffusion device;

The light source comprises a third light emitting component and a fourth light emitting component, wherein the third light emitting component comprises a third lamp panel for emitting a third light path, and a second grating and a light condensing rod are sequentially arranged on the light emitting path of the third lamp panel; the fourth light emitting assembly comprises a fourth lamp panel used for emitting a fourth light path, and a second diffusion device is arranged on the light emitting path of the fourth lamp panel; the light splitting device is arranged on the overlapped light path section of the third light path and the fourth light path, and can be driven to be switched to a first position to guide the third light path to be shot into the detected area or switched to a second position to guide the fourth light path to be shot into the detected area.

Optionally, the first lamp panel is an infrared lamp panel; the first grating is a lens grating.

Optionally, the first light emitting components are provided with two groups, and the two groups of the first light emitting components are oppositely arranged.

Optionally, the second lamp panel is an RGB lamp panel, and the first diffusion device has a diffusion plate with a frosted surface.

Optionally, the third lamp panel is an ultraviolet lamp panel, and the third lamp panel is a linear lamp panel.

Optionally, the fourth light panel is an RGB light panel.

Optionally, an adjusting groove is formed in the light source shell, an adjusting rod is slidably arranged in the adjusting groove, an adjusting knob is rotatably arranged on the adjusting rod, and the adjusting knob is rotatably connected with the light splitting device;

The adjusting groove, the adjusting rod and the adjusting knob form a lever mechanism, and the adjusting rod can be driven to slide along the adjusting groove so as to drive the light splitting device to switch between the first position and the second position.

Optionally, the combined light source further includes:

The first heat dissipation component is close to the first light emitting component;

the second heat dissipation component is close to the third light emitting component;

The third heat dissipation assembly is arranged in the middle of the light source shell.

Optionally, the first heat dissipation assembly includes a first heat dissipation fan;

the second heat dissipation assembly comprises a second heat dissipation fan and a first heat dissipation cavity, and two first medium inlets and outlets for medium to be introduced and discharged are arranged on the first heat dissipation cavity;

The third heat dissipation assembly comprises a second heat dissipation cavity, and two second medium inlets and outlets for medium to be introduced and discharged are arranged on the second heat dissipation cavity.

The invention also provides a machine vision detection device comprising the combined light source as described in any one of the above.

Compared with the prior art, the invention has the following beneficial effects:

The invention provides a combined light source and a machine vision detection device, which are suitable for different application scenes by combining and switching multiple light sources and overcome the limitation problem of the existing single light source detection scene.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.

FIG. 1 is a schematic cross-sectional view of a combined light source applied to a machine vision inspection device according to the present invention;

fig. 2 is a schematic diagram of the overall structure of a combined light source according to the present invention.

In the above figures: 10. a light source housing; 101. a first window; 102. a second window; 21. a first light emitting component; 211. a first lamp panel; 212. a first grating; 22. a second light emitting component; 221. a second lamp panel; 222. a first diffusion device; 23. a third light emitting component; 231. a third lamp panel; 232. a light-gathering rod; 233. a second grating; 24. a fourth light emitting component; 241. a fourth lamp panel; 242. a second diffusion device; 31. a first heat dissipation assembly; 311. a first heat radiation fan; 32. a second heat dissipation assembly; 321. a first media access; 322. a second heat radiation fan; 33. a third heat sink assembly; 331. a second medium inlet and outlet; 41. an adjustment tank; 42. an adjusting rod; 43. an adjustment knob; 44. a spectroscopic device; 441. a mounting frame; 51. a photographing device; 52. the workpiece to be tested.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is apparent that the embodiments described below are only some embodiments of the present invention, not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

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

Furthermore, the terms "long," "short," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship based on that shown in the drawings, for convenience of description of the present invention, and are not intended to indicate or imply that the apparatus or elements referred to must have this particular orientation, operate in a particular orientation configuration, and thus should not be construed as limiting the invention.

In the field of machine vision, a light source is one of the important components in acquiring image information. Common light sources include visible light, infrared light and the like, and have different characteristics and advantages in different application scenes. In order to meet the different application requirements, the present patent application proposes a solution comprising a UV light source, an infrared light source and a trichromatic light source, and a specific film layer is provided on the light path of each light source.

The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.

Referring to fig. 1 and 2 in combination, the present invention provides a combined light source, which includes a light source housing 10, a first window 101 formed on the light source housing 10 for aligning with a region to be photographed, and a second window 102 for aligning with the photographing device 51, wherein the first window 101 and the second window 102 are coaxial.

It will be appreciated that the workpiece to be inspected is conveyed to the inspected area by a conveying means such as a belt, the combined light source irradiates the workpiece to be inspected, and then the inspected workpiece 52 is photographed by a photographing device 51 to obtain an inspected image including the surface features of the inspected workpiece 52.

In the present embodiment, the light source housing 10 is provided with:

The first light-emitting component 21 and the second light-emitting component 22, wherein the first light-emitting component 21 comprises a first lamp panel 211 for emitting a first light path, a first grating 212 is arranged on the light-emitting path of the first lamp panel 211, and the first light path vertically emits into the region to be detected through the first grating 212; the second light emitting component 22 includes a second light panel 221 for emitting a second light path, the light emitting path of the second light panel 221 is provided with a first diffusion device 222, and the second light path is obliquely emitted into the region to be detected through the first diffusion device 222;

By arranging the first light-emitting component 21 and the second light-emitting component 22, light paths in two different directions or angles are emitted simultaneously in the detected area, so that detection light rays perpendicular to and inclined to the detected surface can be provided, and further different types of defect detection can be realized.

Further, a third light emitting component 23 and a fourth light emitting component 24 are further arranged in the light source housing 10, the third light emitting component 23 comprises a third lamp panel 231 for emitting a third light path, and a second grating 233 and a light condensing rod 232 are sequentially arranged on the light emitting path of the third lamp panel 231; the fourth light emitting component 24 includes a fourth light panel 241 for emitting a fourth light path, and a second diffusion device 242 is disposed on the light emitting path of the fourth light panel 241; the overlapped light path section of the third light path and the fourth light path is provided with a light splitting device 44, and the light splitting device 44 is movably connected with the light source shell 10 through a mounting frame 441; the beam splitter 44 may be driven to switch to a first position to direct the third path of light into the region to be examined, or to switch to a second position to direct the fourth path of light into the region to be examined.

By providing the third light exit assembly 23 and the fourth light exit assembly 24, it is possible to achieve that at least two different light paths are respectively injected into the area to be measured, so as to be adapted to the optical measurement or illumination task. The light splitting device 44 is disposed in the overlapping light path section between the third light path and the fourth light path, and the light splitting device 44 is switched to a different position, so that the third light path or the fourth light path is selectively guided to be shot into the detected area, and different optical paths can be selected to perform measurement or illumination according to the requirement.

Based on the structure, the combined light source provided by the invention can realize multi-light-path injection into the detected area, and realize different optical effects and functions in a light path adjustment and light path separation mode.

Further, in the present embodiment, the first lamp panel 211 is an infrared lamp panel; the first grating 212 is a lenticular grating.

It can be understood that the lens grating can focus scattered infrared light on a point, so that the irradiation intensity and the distance of the infrared lamp panel are enhanced, meanwhile, the infrared light can be controlled, a specific scattering effect is achieved, and the infrared lamp panel can better adapt to specific lighting requirements. In addition, the lens grating can also filter infrared light in a specific wavelength range, shield or reduce interference light of other wavelengths, so as to increase the accuracy of identification and detection of a target object.

Further, the first light emitting assemblies 21 are provided with two groups, and the two groups of first light emitting assemblies 21 are oppositely arranged. The two groups of light sources are symmetrically arranged, so that uniform illumination can be better provided, and interference of factors such as shadow, reflection and the like on image quality and processing results is reduced; meanwhile, as the stability of the light source is critical to the performance of the machine vision system, the symmetrically arranged light sources can be mutually complemented, and the problem caused by the instability of the light of a single light source is reduced. In addition, the two groups of light sources are symmetrically arranged, so that reflection and shadow can be reduced or eliminated, and the quality and accuracy of an image are improved.

Further, the second light panel 221 and the fourth light panel 241 are both RGB light panels. Specifically, RGB stands for three basic colors of red, green and blue, and the RGB light source can provide light rays with different colors and brightness, so as to help the machine vision system identify and distinguish different objects by analyzing reflected light with different colors on the surface of the object.

In addition, the first diffusion device 222 has a diffusion plate with a frosted surface. In this embodiment, the diffusion plate with the frosted surface can diffuse light from one point to a larger area, so that the light can be more uniformly irradiated onto the observed object. In this way, the partial area is prevented from being too bright or too dark due to the fact that strong light is focused on a certain point, so that the recognition and detection capability of the machine vision system on objects is improved, and the quality of the collected images is ensured to be more stable and reliable.

To improve the assembly efficiency, the first diffusion device 222 is integrally formed with the first grating 212.

Further, the third light plate 231 is an ultraviolet light plate, and the third light plate 231 is a linear light plate. In the field of machine vision, linear ultraviolet lamp panels can highlight defects, foreign objects or stains on the surface of an object; by using a line ultraviolet lamp panel, high accuracy defect detection, such as detection of cracks, scratches, etc., on the surface of a metal product, can be achieved in a machine vision system. In addition, for certain special materials, such as glass or plastic, they may exhibit surface reflection or refraction under conventional light sources, resulting in reduced image quality, while the use of linear uv lamp panels to illuminate can eliminate such reflection or refraction, making the image easier to process and analyze.

In summary, in the invention, by arranging the UV light source, the infrared light source and the three-color light source and arranging the specific film layer on the light path of the light source, the output effect of the light source is enhanced, and the precision and quality of image acquisition and processing are improved.

In this embodiment, an adjusting groove 41 is provided on the light source housing 10, an adjusting rod 42 is slidably provided in the adjusting groove 41, an adjusting knob 43 is rotatably provided on the adjusting rod 42, and the adjusting knob 43 is rotatably connected with a spectroscopic device 44; the adjustment slot 41, the adjustment lever 42 and the adjustment knob 43 form a lever mechanism, the adjustment lever 42 being drivable to slide along the adjustment slot 41 to drive the light-splitting device 44 to switch between the first position and the second position.

The lever mechanism is designed based on the principle that under the action of a fixed fulcrum, the force is amplified or reduced by the action of the force at the other end. In the present embodiment, the adjusting knob 43 provides the driving force, and the lever mechanism converts the rotation force of the adjusting knob 43 into the sliding force of the adjusting lever 42 in the adjusting slot 41, and the light splitting device 44 is switched between different positions by the sliding of the adjusting lever 42 in the adjusting slot 41, so as to realize the switching of the third light emitting assembly 23 and the fourth light emitting assembly 24.

In this embodiment, the combined light source further includes:

the first heat dissipation component 31, the first heat dissipation component 31 is disposed close to the first light emitting component 21;

The second heat dissipation component 32, the second heat dissipation component 32 is disposed close to the third light emitting component 23;

The third heat dissipation assembly 33, the third heat dissipation assembly 33 is disposed in the middle of the light source housing.

Wherein the first heat dissipation assembly 31 includes a first heat dissipation fan 311; the heat dissipation fan is used for exhausting heat from the detection device through wind power. The first heat dissipation component 31 is placed near the first light emitting component 21, so that heat generated by the first light emitting component 21 can be effectively and directly taken away, and the temperature of the detection device is reduced.

The second heat dissipation assembly 32 includes a second heat dissipation fan 322 and a first heat dissipation cavity, where two first medium inlets and outlets 321 are disposed on the first heat dissipation cavity for medium to flow in and out. Based on this, heat may be conducted from the third light emitting assembly 23 to the second heat dissipation chamber and then discharged through the heat dissipation fan. Such a design effectively reduces the influence of the heat generation of the third light extraction assembly 23 on the overall detection device.

The third heat dissipation assembly 33 includes a second heat dissipation cavity, and two second medium inlets 331 for medium to flow in and out are disposed on the second heat dissipation cavity. The third heat dissipation assembly 33 can provide additional heat dissipation support at the center of the light source to ensure the heat dissipation balance of the light source as a whole.

Based on the foregoing embodiments, the present invention further provides a machine vision inspection device, including a combined light source as in any one of the above, and further including a photographing device 51 aligned with the second window 102. The inspection workpiece is transferred to the area to be inspected by a transfer tool such as a belt, the combined light source irradiates the inspection workpiece, and then the inspection workpiece 52 is photographed by a photographing device 51 to obtain an inspection image containing the surface features of the inspection workpiece 52.

The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the 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 scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. The combined light source is characterized by comprising a light source shell (10), wherein a first window (101) for aligning with a detected area and a second window (102) for aligning with a shooting device (51) are formed in the light source shell (10), and the first window (101) and the second window (102) are coaxial; the light source housing (10) is internally provided with:

The first light emitting component (21) comprises a first lamp panel (211) for emitting a first light path, a first grating (212) is arranged on the light emitting path of the first lamp panel (211), and the first light path is vertically emitted into the detected area through the first grating (212); the second light emitting component (22) comprises a second lamp panel (221) for emitting a second light path, a first diffusion device (222) is arranged on the light emitting path of the second lamp panel (221), and the second light path is obliquely emitted into the detected area through the first diffusion device (222);

The light-emitting device comprises a third light-emitting component (23) and a fourth light-emitting component (24), wherein the third light-emitting component (23) comprises a third lamp panel (231) for emitting a third light path, and a second grating (233) and a light-gathering rod (232) are sequentially arranged on the light-emitting path of the third lamp panel (231); the fourth light emitting component (24) comprises a fourth lamp panel (241) for emitting a fourth light path, and a second diffusion device (242) is arranged on the light emitting path of the fourth lamp panel (241); the overlapped light path section of the third light path and the fourth light path is provided with a light splitting device (44), and the light splitting device (44) can be driven to be switched to a first position to guide the third light path to be shot into the detected area or switched to a second position to guide the fourth light path to be shot into the detected area.

2. The combination light source according to claim 1, wherein the first light panel (211) is an infrared light panel; the first grating (212) is a lenticular grating.

3. The combined light source according to claim 1 or 2, wherein two groups of the first light emitting components (21) are provided, and the two groups of the first light emitting components (21) are disposed opposite to each other.

4. The combination light source of claim 1, wherein the second light panel (221) is an RGB light panel and the first diffuser element (222) has a frosted diffuser plate.

5. The combination light source of claim 1, wherein the third light panel (231) is an ultraviolet light panel and the third light panel (231) is a linear light panel.

6. The combination light source according to claim 1, wherein the fourth light panel (241) is an RGB light panel.

7. A combined light source according to claim 1, characterized in that an adjusting groove (41) is arranged on the light source housing (10), an adjusting rod (42) is slidably arranged in the adjusting groove (41), an adjusting knob (43) is rotatably arranged on the adjusting rod (42), and the adjusting knob (43) is rotatably connected with the light splitting device (44);

the adjusting groove (41), the adjusting rod (42) and the adjusting knob (43) form a lever mechanism, and the adjusting rod (42) can be driven to slide along the adjusting groove (41) so as to drive the light splitting device (44) to switch between the first position and the second position.

8. The combination light source of claim 1, further comprising:

A first heat dissipation assembly (31), the first heat dissipation assembly (31) being disposed proximate to the first light extraction assembly (21);

a second heat sink assembly (32), the second heat sink assembly (32) being disposed proximate to the third light exit assembly (23);

And the third heat dissipation assembly (33) is arranged in the middle of the light source shell, and the third heat dissipation assembly (33) is arranged in the middle of the light source shell.

9. The combined light source according to claim 8, wherein the first heat dissipating component (31) comprises a first heat dissipating fan (311);

The second heat dissipation assembly (32) comprises a second heat dissipation fan (322) and a first heat dissipation cavity, wherein two first medium inlets and outlets (321) for medium to be introduced and discharged are arranged on the first heat dissipation cavity;

The third heat dissipation assembly (33) comprises a second heat dissipation cavity, and two second medium inlets and outlets (331) for medium to be introduced and discharged are arranged on the second heat dissipation cavity.

10. A machine vision inspection apparatus comprising a combined light source as claimed in any one of claims 1 to 9.