CN211600343U - Lighting device for machine vision - Google Patents
Lighting device for machine vision Download PDFInfo
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- CN211600343U CN211600343U CN201921946754.0U CN201921946754U CN211600343U CN 211600343 U CN211600343 U CN 211600343U CN 201921946754 U CN201921946754 U CN 201921946754U CN 211600343 U CN211600343 U CN 211600343U
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Abstract
The utility model belongs to the technical field of visual detection, concretely relates to lighting device for machine vision. The utility model provides a lighting device for machine vision, which comprises a reflection assembly and a light source assembly, wherein the reflection assembly is provided with a shell with an opening at the bottom end, and the inner wall surface of the shell is provided with a diffuse reflection surface; the light source assembly is disposed at the bottom opening and has a first light source facing the diffusive reflective surface and a second light source facing a central region of the bottom opening. The light emitted by the first light source is subjected to diffuse reflection, so that the illumination range is enlarged, the light is uniform and soft, the uneven surface of the object to be detected can be favorably illuminated, and the reflection phenomenon is eliminated; the second light source adopts a direct lighting mode to provide light compensation for the central area of the bottom opening, so that the brightness is improved; the first light source and the shell, and the second light source and the shell are detachably connected, so that light sources with different wavelengths and diffuse reflection combinations with different structures can be realized to obtain different illumination effects, the surface of an object to be detected can be completely displayed, and the detection effect is better.
Description
Technical Field
The utility model belongs to the technical field of visual detection, concretely relates to lighting device for machine vision.
Background
Machine vision is a branch of the rapid development of AI artificial intelligence. In brief, machine vision is to replace human eyes with a machine for measurement and judgment; specifically, machine vision is to convert a captured target into an image signal through a machine vision product (i.e., an image capturing device, which is divided into a CMOS and a CCD), transmit the image signal to a dedicated image processing system, and convert the image signal into a digitized signal according to information such as pixel distribution, brightness, color, and the like; the image system performs various calculations on these signals to extract the features of the target, and then controls the operation of the on-site equipment according to the result of the discrimination. In the modern automated production process, people apply machine vision detection technology to the fields of working condition monitoring, finished product inspection, quality control and the like.
The arc top light source (also called dome light source) is the most commonly used light source in machine vision, the light source is arranged at the inner side of the bottom opening of the hemispherical cavity, and light emitted by the light source is reflected for multiple times by the inner wall surface of the hemispherical cavity, so that the cavity can be uniformly illuminated as much as possible, and the arc top light source can be used for detecting spherical or other curved surface objects. However, the arc top light source with the structure has a limited emergent angle due to the shielding of the bottom opening frame, and the reflected light rays passing through the inner wall surface of the hemispherical cavity are concentrated in the central area of the cavity and the central area of the bottom opening, so that the reflected light rays in the whole space of the cavity are not uniformly distributed, and the brightness of other areas with the bottom opening deviating from the center is insufficient, so that an object to be detected needs to be placed inside the hemispherical cavity when the object to be detected is detected. For example, when the arc top light source with the structure is used for detecting the rivet, the arc top light source can illuminate an area with a small slope but cannot illuminate an area with a large slope because the change range of the slope of the surface of the rivet is very large.
SUMMERY OF THE UTILITY MODEL
Therefore, the to-be-solved technical problem of the utility model lies in overcoming the limited and uneven defect of light distribution of scope of illuminating of current arc top light source to a machine vision that can wait to detect the object to realize comprehensive and clear illumination volume to the curved surface is with lighting device is proposed.
In order to solve the technical problem, the utility model discloses a technical scheme is:
the utility model provides a lighting device for machine vision, include:
the reflection assembly is provided with a shell with an opening at the bottom end, and a diffuse reflection surface is arranged on the inner wall surface of the shell;
the light source assembly comprises a first light source, a second light source, a first base and a second base, wherein the first base is located at the bottom end opening, the second base is arranged on one side surface, away from the reflection assembly, of the first base, the first light source is detachably connected with the shell, the second base is detachably connected with the first base, the first light source is arranged in the shell to reflect light through the diffuse reflection surface, and the second light source is arranged on the second base to emit light to the center of the second base.
Preferably, in the lighting device for machine vision of this configuration, the first base extends from the bottom opening edge toward the bottom opening center to form a first fixing surface on which the first light source is fixed, and the bottom opening edge abuts against the first fixing surface.
Further preferably, in the lighting device for machine vision of this configuration, the second base has a second fixing surface facing the center of the bottom opening and on which the second light source is fixed, the first fixing surface and/or the second fixing surface is an annular surface, and the first light source and/or the second light source is an annular array light emitter.
Further preferably, in the lighting device for machine vision of the structure, the reflecting assembly further has a boss which is arranged at the bottom end opening and protrudes from the outer wall surface of the housing;
the first base and the second base are annular plates, and the outer edges of the first base and the second base protrude out of the outer wall surface of the shell and are connected with the bosses through fasteners.
Further preferably, in the lighting device for machine vision having the above configuration, an accommodating groove for mounting the second light source is provided in an inner wall surface of the second base ring.
Further preferably, in the lighting device for machine vision having the above configuration, a heat sink is provided between the first light source and the first base and/or between the second light source and the second base.
Preferably, the lighting device for machine vision of this structure, the housing is further provided with a top end opening opposite to the bottom end opening.
Preferably, the lighting device for machine vision of this structure, the inner wall surface of the housing is provided with a nano-reflector layer to form the diffuse reflection surface.
Preferably, in the lighting device for machine vision having this configuration, the housing is selected from any one of a hemispherical housing, a semi-elliptical housing, and a rectangular parallelepiped housing.
The utility model discloses technical scheme has following advantage:
1. the utility model provides a lighting device for machine vision, including reflection assembly and light source subassembly. The reflection assembly is provided with a shell with an opening at the bottom end, and the inner wall surface of the shell is provided with a diffuse reflection surface; the light source component comprises a first light source, a second light source, a first base and a second base, wherein the first base is located at the bottom end opening, the second base is arranged on the side surface, away from the reflection component, of the first base, the first base is detachably connected with the shell, the second base is detachably connected with the first base, the first light source is arranged in the shell to reflect light through the diffuse reflection surface, and the second light source is arranged on the second base to emit the light to the center of the second base.
Compared with the mirror reflection of an arc top light source with a conventional structure, the lighting device for machine vision with the structure has the advantages that the light emitted by the first light source can expand the illumination range after the diffuse reflection is carried out on the diffuse reflection surface, the light is uniform and soft, the uneven surface of an object to be detected can be illuminated, and the reflection phenomenon is eliminated; meanwhile, the second light source adopts a direct lighting mode to provide light compensation for the central area of the opening of the shell, so that the brightness of the central area of the opening of the shell is improved; the first light source is detachably connected with the shell, the second base is detachably connected with the first base, the light sources with different wavelengths and the diffuse reflection surfaces with different structures are combined to obtain different lighting effects, the surface of an object to be detected can be completely displayed, and the detection effect is better.
2. The utility model provides a lighting device for machine vision, first light source and (or) the second light source be the annular array luminous body, can provide sufficient and the even light of distribution for this machine vision lighting device, are favorable to improving detection effect.
3. The utility model provides a lighting device for machine vision, second base ring medial surface are provided with the storage tank that supplies the second light source installation, and this storage tank can protect the second light source to avoid receiving in the testing process and wait to detect the object collision and damaged.
4. The utility model provides a lighting device for machine vision, between first light source and the first base and (or) be provided with the fin between second light source and the second base, be favorable to protecting first base and second base and do not receive the high temperature burn, prolong this lighting device for machine vision's life.
5. The utility model provides a lighting device for machine vision, casing internal face are provided with the nanometer reflecting plate as the diffuse reflection face, and the nanometer reflecting plate has high reflection and diffusion capacity, can eliminate the glare facula for reflected light is soft even more.
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 embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic cross-sectional structure view of a lighting device for machine vision according to embodiment 1 of the present invention;
fig. 2 is a schematic view of a local explosion of a lighting device for machine vision according to embodiment 1 of the present invention;
description of reference numerals:
1-a reflective component; 11-a housing; 111-open top; 112-bottom end opening; 12-a diffuse reflective layer; 13-a boss;
2-a light source assembly; 21-a first base; 211-a first fixation surface; 22-a first light source; 23-a second base; 231-a receiving groove; 2311-a second fixation surface; 24-a second light source; 25-heat sink.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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 should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
The present embodiment provides a lighting device for machine vision, as shown in fig. 1, including a reflection assembly 1 and a light source assembly 2.
As shown in fig. 1, the reflection assembly 1 has a case 11, a diffuse reflection layer 12, and a boss 13.
The housing 11 is a hemisphere, and has a top opening 111 and a bottom opening 112 opposite to the top opening 111. The top end opening 111 and the bottom end opening 112 are round holes of the same round axis, the bottom end opening 112 is used for placing an object to be detected, the top end opening 111 is used as a detection camera hole, and the surface condition of the object to be detected is obtained by a camera device through the top end opening 111.
The diffuse reflection layer 12 is arranged on the whole inner wall surface of the shell 11, the diffuse reflection layer 12 is a nano reflection plate, and the nano reflection plate as a diffuse reflection surface of the reflection assembly 1 has high reflection and diffusion capacity, and glare spots are eliminated, so that reflected light rays are softer and more uniform.
An annular boss 13 is arranged at the edge of the bottom end opening 112, the boss 13 protrudes out of the outer wall surface of the shell 11 and is integrally formed with the shell 11, and a mounting hole is formed in the boss 13.
As shown in fig. 1 and 2, the light source assembly 2 has a first base 21, a first light source 22, a second base 23, a second light source 24, and a heat sink 25.
The first base 21 is an annular flat plate abutting against the edge of the bottom opening 112, and the annular flat plate extends from the edge of the bottom opening 112 to the center of the bottom opening 112 and the outside of the bottom opening 112, respectively, so that the inner diameter of the first base 21 is smaller than the caliber of the bottom opening 112, and the outer diameter of the first base is equal to the outer diameter of the boss 13, that is, the inner edge and the outer edge of the first base 21 protrude from the inner wall surface and the outer wall surface of the housing 11, respectively. A portion of the first base 21 extending from the bottom end opening 112 is provided with a mounting hole corresponding to the boss 13,
the first base 21 faces the annular surface to serve as a first fixing surface 211, and after the first base 21 and the boss 13 are fixed by a fastener, the edge of the bottom end opening 112 abuts against the first fixing surface 211.
The first light source 22 is disposed on the first fixing surface 211 located inside the bottom end opening 112. To improve the uniformity of the light emission, the first light source 22 employs a ring array light emitter, which is selected from LEDs in this embodiment. On the first base 21, the included angle of the circle center of the light irradiation range of the first light source 22 is 90 °, each light-emitting body faces the diffuse reflection surface, the emitted light can reach any area of the diffuse reflection surface of the shell 11, and then the light is diffusely reflected by the diffuse reflection surface, so that the light in the cavity of the shell 11 is uniformly distributed.
As shown in fig. 2, a heat sink 25 is disposed between the first light source 22 and the first base 21, and the silicone heat sink is used in this embodiment to prevent the first light source 22 from burning the first base 21 due to high temperature generated by long-time operation.
The second base 23 is a ring-shaped flat plate, the inner diameter of the ring is equal to the inner diameter of the ring of the first base 21, and the outer diameter of the ring is equal to the outer diameter of the ring of the first base 21, that is, the outer edge of the second base 23 protrudes out of the outer wall surface of the housing 11; the second base 23 is provided with mounting holes corresponding to the first base 21 and the bosses 13.
An annular receiving groove 231 is formed on the inner wall surface of the second base 23, the receiving groove 231 has a flared cross section, the opening direction of the receiving groove 231 faces the center of the bottom opening 112, and the bottom surface of the receiving groove serves as a second fixing surface 2311.
As shown in fig. 2, the second light source 24 is fixed on the second fixing surface 2311 in the accommodating groove 231. To improve the light intensity and uniformity in the central region of the bottom opening 112, the second light source 24 is an annular array of light emitters, in this embodiment LEDs.
A heat sink 25 is disposed between the second light source 24 and the second base 23, and a silicone heat sink is employed in this embodiment to prevent the second base 23 from being burned by the high temperature generated by the long-time operation of the second light source 24.
When the reflection assembly 1 and the light source assembly 2 are assembled, the first fixing surface 211 of the first base 21 abuts against the boss 13, the second base 23 abuts against the surface of one side of the first base 21 away from the boss 13, and the first base is fixed by the fastener. Because the diffuse reflection is not only related to the roughness of the diffuse reflection layer, but also related to the wavelength of the light of the illuminant, the first base 21 for fixing the first light source 22 and the shell 11 with the diffuse reflection layer 12 are detachably connected, and the second base 23 for fixing the second light source 24 and the first base 21 are detachably connected, so that the combination of the light sources with different wavelengths and the diffuse reflection layers with different structures can be realized, different lighting effects can be obtained, the surface of an object to be detected can be completely displayed, and the detection effect is better.
Compared with the mirror reflection of an arc top light source with a conventional structure, the lighting device for machine vision with the structure has the advantages that the light rays emitted by the first light source 22 can expand the illumination range after being subjected to diffuse reflection on the diffuse reflection surface, are uniform and soft, are more favorable for illuminating the uneven surface of an object to be detected, and eliminate the reflection phenomenon; meanwhile, the second light source 24 adopts a direct illumination mode to provide light compensation for the central area (the center of the second base 23) of the bottom opening 112, so that the brightness of the central area of the bottom opening 112 is improved; the first light source 22 and the second light source 24 are detachably connected with the housing 11, so that light sources with different wavelengths and diffuse reflection surfaces with different structures can be combined to obtain different illumination effects, the surface of an object to be detected can be completely displayed, the detection effect is better, and the method is more suitable for detecting the condition that the slope of the surface of the object to be detected changes greatly (such as riveting pieces).
Example 2
Unlike embodiment 1, the housing 11 may have a semi-elliptical spherical structure or a rectangular parallelepiped structure, as long as light emitted from the first light source 22 is diffusely reflected by the diffuse reflection layer 12 provided on the inner wall surface of the housing 11.
Example 3
Unlike the embodiment 1, the diffuse reflection layer 12 disposed on the inner wall surface of the housing 11 may be made of other materials, such as MgO and BaSO4Etc., different materials can be selected as the diffuse reflection layer 12 according to actual needs to provide different light rays, so as to be suitable for the surfaces of various detected objects.
Example 4
Unlike embodiment 1, the present embodiment provides a lighting device for machine vision, in which the housing 11 may be provided with only the bottom opening 112 instead of the top opening 111, and the surface condition of the object to be detected can also be obtained by disposing the camera device on the top end of the housing 11.
Example 5
The present embodiment provides a lighting device for machine vision, which is different from embodiment 1 in that heat dissipation fins 25 may be disposed between the first light source 22 and the first base 21, and between the second light source 24 and the second base 23, and may be determined according to the thermal effect generated by the different light sources during operation and the high temperature resistance of the different bases.
As a further variation of the alternative embodiment, the heat sink 25 is not disposed between the first light source 22 and the first base 21, or between the second light source 24 and the second base 23, and the first base 21 and the second base 23 made of high temperature resistant materials are selected.
Example 6
Unlike embodiment 1, the present embodiment provides a lighting device for machine vision, in which the inner wall surface of the second base 23 may not be provided with the accommodating groove 231, but may have a ring-shaped flat wall surface structure, and may also serve as a second fixing surface 2311 for fixing the second light source 24. The second base 23 of this structure, although it does not protect the second light source 24, can still achieve the basic function of the second light source 24 to illuminate the central area of the bottom opening 112.
Example 7
The present embodiment provides a lighting device for machine vision, which is different from embodiment 1 in that the first base 21 can be further provided with a plurality of independent sub-bases in an annular arrangement form, and the first light source 22 can be fixed and detachably connected to the boss 13 and the second base 23 respectively; similarly, the second base 23 can be disposed in a plurality of independent sub-bases arranged in a ring, and the second light source 24 can be fixed and detachably connected to the first base 21.
Example 8
Unlike embodiment 1, the first light source 22 may be in a non-array arrangement form, such as a ring-shaped continuous light emitter; similarly, the second light source 24 may be arranged in a non-array arrangement, such as a ring-shaped continuous light emitter.
As a further variation of the alternative embodiment, the first light source 22 and the second light source 24 may also independently select an array illuminant and a continuous illuminant combination.
Example 9
Unlike embodiment 1, the present embodiment provides a lighting device for machine vision, and the second base 23 may not be separately provided as a fixing structure of the second light source 24, but the second light source 24 is provided on the other side surface of the first base 21 away from the housing 11, so that the function of the second light source 24 for illuminating the central area of the bottom opening 112 can be realized, and the second light source 24 is detachably connected to the housing 11.
Example 10
Unlike embodiment 1, the present embodiment may provide a lighting device for machine vision, in which the first base 21 is not separately provided, but the first light source 22 is directly provided on the inner wall surface of the housing 11 near the bottom opening 112 and faces the diffuse reflection surface, and the second light source 24 is directly provided on the end surface of the bottom opening 112 and faces the central area of the bottom opening 112.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (9)
1. An illumination device for machine vision, comprising:
the reflection assembly is provided with a shell with an opening at the bottom end, and a diffuse reflection surface is arranged on the inner wall surface of the shell;
the light source assembly comprises a first light source, a second light source, a first base and a second base, wherein the first base is located at the bottom end opening, the second base is arranged on one side surface, away from the reflection assembly, of the first base, the first light source is detachably connected with the shell, the second base is detachably connected with the first base, the first light source is arranged in the shell to reflect light through the diffuse reflection surface, and the second light source is arranged on the second base to emit light to the center of the second base.
2. The lighting device for machine vision according to claim 1, wherein the first base extends from the bottom opening edge toward the bottom opening center to form a first fixing surface for fixing the first light source, and the bottom opening edge abuts against the first fixing surface.
3. The lighting device for machine vision according to claim 2, wherein the second base has a second fixing surface facing the center of the bottom opening for fixing the second light source, the first fixing surface and/or the second fixing surface is an annular surface, and the first light source and/or the second light source is an annular array light emitter.
4. The machine vision illumination device of any one of claims 1-3, wherein the reflector assembly further comprises a boss disposed at the bottom end opening and protruding from the outer wall surface of the housing;
the first base and the second base are annular plates, and the outer edges of the first base and the second base protrude out of the outer wall surface of the shell and are connected with the bosses through fasteners.
5. The machine vision illumination device of claim 4, wherein the second susceptor ring has a receiving groove provided on an inner wall surface thereof for receiving the second light source.
6. The lighting device for machine vision according to claim 5, wherein a heat sink is provided between the first light source and the first base and/or between the second light source and the second base.
7. The machine vision illumination device of any one of claims 1-3, wherein the housing further defines a top opening opposite the bottom opening.
8. The illumination device for machine vision according to any one of claims 1 to 3, wherein a nano-reflector layer is provided on an inner wall surface of the housing to form the diffuse reflection surface.
9. The lighting device for machine vision according to any one of claims 1 to 3, wherein the housing is selected from any one of a hemispherical housing, a semi-ellipsoidal housing, and a rectangular parallelepiped housing.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921946754.0U CN211600343U (en) | 2019-11-12 | 2019-11-12 | Lighting device for machine vision |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921946754.0U CN211600343U (en) | 2019-11-12 | 2019-11-12 | Lighting device for machine vision |
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| CN211600343U true CN211600343U (en) | 2020-09-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114047191A (en) * | 2021-11-09 | 2022-02-15 | 常州光电技术研究所 | Illumination light source for machine vision detection of surface flaws of small-diameter sphere |
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2019
- 2019-11-12 CN CN201921946754.0U patent/CN211600343U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114047191A (en) * | 2021-11-09 | 2022-02-15 | 常州光电技术研究所 | Illumination light source for machine vision detection of surface flaws of small-diameter sphere |
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