CN217277920U - Visual imaging device - Google Patents
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- CN217277920U CN217277920U CN202123230014.7U CN202123230014U CN217277920U CN 217277920 U CN217277920 U CN 217277920U CN 202123230014 U CN202123230014 U CN 202123230014U CN 217277920 U CN217277920 U CN 217277920U
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Abstract
The utility model discloses a vision imaging device, include: a first light source, a second light source, and a first camera; the first light source is used for providing a first detection light beam to a detection area on a surface to be detected along a first direction, and the second light source is used for providing a second detection light beam to the detection area along a second direction; an included angle between the first direction and the surface to be measured is a first included angle, an included angle between the second direction and the surface to be measured is a second included angle, the first included angle and the second included angle are the same and larger than 0 degree, and the first light source and the second light source are symmetrically arranged along a central axis of the surface to be measured; the optical axis of the first camera coincides with the central axis of the surface to be detected, so that the phenomenon of missing detection in manual detection can be avoided, and various defects of the mobile phone glass rear plate can be automatically detected through the visual imaging device.
Description
Technical Field
The embodiment of the utility model provides a relate to cell-phone casing defect detecting technical field, especially relate to a vision imaging device.
Background
The mobile phone becomes a necessity in people's life, along with the upgrading of the demand, the standard of the surface detection of the whole mobile phone is greatly improved, and the mobile phone glass rear plate (also called BG) is generally made of mirror surface materials, fine abrasive materials and the like, and has various colors. At present, the detection of the mobile phone matching assembly is gradually transformed into automatic machine vision detection, and the detection of a mobile phone glass cover plate is no exception; however, the problems exist in that most of visual imaging schemes are complex and cannot cover various defect types due to various material, color and curved surface (radian) diversity of the mobile phone glass cover plate, and the detection leakage phenomenon also exists in manual detection, wherein the defects of light leakage of edge ink, abnormal color and the like are high defect types of human eye detection leakage.
SUMMERY OF THE UTILITY MODEL
The utility model provides a vision imaging device to realize the detection to the various defect types of cell-phone glass back plate.
In order to achieve the above object, the utility model provides a vision imaging device, include: a first light source, a second light source, and a first camera;
the first light source is used for providing a first detection light beam to a detection area on the surface to be detected along a first direction, and the second light source is used for providing a second detection light beam to the detection area along a second direction; an included angle between the first direction and the surface to be detected is a first included angle, an included angle between the second direction and the surface to be detected is a second included angle, the first included angle and the second included angle are the same and are larger than 0 degree, and the first light source and the second light source are symmetrically arranged along the central axis of the surface to be detected; the optical axis of the first camera coincides with the central axis of the surface to be measured.
Optionally, the first included angle and the second included angle are both 75 ± 5 degrees.
Optionally, the first camera is a color line scan camera.
Optionally, the visual imaging apparatus further comprises: a third light source and a second camera;
the third light source is used for providing a third detection light beam to the detection area along a third direction; an included angle between the third direction and the surface to be measured is a third included angle, and the third included angle is smaller than the first included angle; and the included angle between the optical axis of the second camera and the surface to be detected is the same as the third included angle.
Optionally, the visual imaging apparatus further comprises: and the fourth light source is used for providing a fourth detection light beam to a detection area on the surface to be detected along a fourth direction, the fourth direction and the included angle of the surface to be detected are a fourth included angle, the fourth included angle is smaller than the third included angle, and the fourth light source and the third light source are alternately lightened.
Optionally, the visual imaging apparatus further comprises: a strobe controller for controlling the third light source and the fourth light source to be alternately illuminated.
Optionally, the third included angle is 45 ± 5 degrees, and the fourth included angle is 20 ± 5 degrees.
Optionally, the third light source is a collimated light source.
Optionally, the third included angle is 15 ± 5 degrees.
Optionally, the second camera is a black and white line scan camera.
According to the utility model provides a vision imaging device, include: a first light source, a second light source, and a first camera; the first light source is used for providing a first detection light beam to a detection area on the surface to be detected along a first direction, and the second light source is used for providing a second detection light beam to the detection area along a second direction; an included angle between the first direction and the surface to be measured is a first included angle, an included angle between the second direction and the surface to be measured is a second included angle, the first included angle and the second included angle are the same and larger than 0 degree, and the first light source and the second light source are symmetrically arranged along a central axis of the surface to be measured; the optical axis of the first camera is superposed with the central axis of the surface to be detected, so that the phenomenon of missing detection in manual detection can be avoided, and various defects of the mobile phone glass rear plate can be automatically detected through the visual imaging device.
Drawings
Fig. 1 is a schematic structural diagram of a visual imaging apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a visual imaging apparatus according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a visual imaging apparatus according to a third embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
For the glass surface made of frosted material or the glass surface made of mirror surface material, the defect types such as light different color points, heavy different color points, strip different colors, block different colors and the like can be detected by the visual imaging device provided by the first embodiment.
Fig. 1 is a schematic structural diagram of a visual imaging apparatus according to an embodiment of the present invention. As shown in fig. 1, the visual imaging apparatus 100 includes: a first light source 101, a second light source 102, and a first camera 103;
the first light source 101 is used for providing a first detection light beam 104 to a detection area on a surface to be detected 105 along a first direction, and the second light source 102 is used for providing a second detection light beam 106 to the detection area along a second direction; an included angle between the first direction and the surface to be measured 105 is a first included angle α 1, an included angle between the second direction and the surface to be measured 105 is a second included angle α 2, the first included angle α 1 and the second included angle α 2 are the same and greater than 0 degree, and the first light source 101 and the second light source 102 are symmetrically arranged along a central axis 107 of the surface to be measured 105; the optical axis of the first camera 103 coincides with the central axis 107 of the surface to be measured 105.
Optionally, the first included angle α 1 and the second included angle α 2 are both 75 ± 5 degrees (preferably 75 degrees, which may cover 90% of the defect types).
Optionally, the first camera 103 is a color line scan camera (which is advantageous for detecting metameric defects).
It should be noted that, the first camera 103 is located right above the detection area, after the first light source 101 and the second light source 103 are simultaneously turned on, the first detection light beam 104 and the second detection light beam 106 both reach the surface 105 to be detected, a defect on the surface 105 to be detected reflects the first detection light beam 104 or the second detection light beam 106 to be reflected into the first camera 103, the first camera 103 images the detection area, the first light source 101, the second light source 103 and the first camera 103 form a dark field imaging device, and defect types such as a light different color point, a heavy different color point, a stripe different color, a block different color and the like can be detected in a dark field (the glass surface is a frosted material and the glass surface is a mirror surface material). It is understood that the surface to be measured 105 and the visual imaging apparatus 100 have relative movement, and after the long-side scanning of the surface to be measured 105 is finished, the surface to be measured 105 may be rotated by 90 degrees and scanned again. After scanning in this way, the imaging contrast of partial defects can be improved.
The first light source 101 and the second light source 102 are symmetrically arranged relative to the central axis 107 to increase the surface brightness of the detection area of the surface 105 to be detected, so that the exposure time of the first camera 103 is reduced, and the detection speed of the visual detection device is increased. The first light source 101 and the second light source 102 may be LED light sources, or collimated light sources.
Example two
For the glass surface made of frosted material, the types of defects such as foreign matters, white spots, pressure scars, indentations, scratches and the like can be detected by the visual imaging device provided by the second embodiment.
Fig. 2 is a schematic structural diagram of a visual imaging apparatus according to an embodiment of the present invention. As shown in fig. 2, the visual imaging apparatus 100 further includes: a third light source 109, a fourth light source 108, and a second camera 110;
the third light source 109 is configured to provide a third detection light beam 112 to a detection area on the surface 105 to be detected along a third direction, and the fourth light source 108 is configured to provide a fourth detection light beam 111 to the detection area along a fourth direction; an included angle between the third direction and the surface to be measured is a third included angle alpha 3, an included angle between the fourth direction and the surface to be measured is a fourth included angle alpha 4, the fourth included angle alpha 4 is smaller than the third included angle alpha 3, and the third included angle alpha 3 is smaller than the first included angle alpha 1; an included angle between the optical axis of the second camera 110 and the surface to be measured is the same as the third included angle α 3, and the third light source 109 and the fourth light source 108 are alternately turned on.
Optionally, the visual imaging apparatus 100 further comprises: a strobe controller 113 for controlling the third light source 109 and the fourth light source 108 to be alternately turned on.
Optionally, the third included angle α 3 is 45 ± 5 degrees (preferably 45 degrees), and the fourth included angle α 4 is 20 ± 5 degrees (preferably 20 degrees).
Optionally, the second camera 110 is a black and white line scan camera.
It should be noted that, on the basis of the first embodiment, the second embodiment adds the third light source 109, the fourth light source 108 and the second camera 110, wherein an included angle between the third detection light beam 112 provided by the third light source 109 and the surface to be measured 105, that is, an included angle between the third included angle α 3 and the optical axis of the second camera 110 and the surface to be measured 105 is the same, so that the third light source 109 forms a bright field light source of the second camera 110, and an included angle between the fourth detection light beam 111 provided by the fourth light source 108 and the surface to be measured 105, that is, the third wire included angle α 4 is smaller than the third included angle α 3, so that the fourth light source 108 forms a dark field light source of the second camera 110. The third light source 109 and the fourth light source 108 may be LED light sources, or collimated light sources.
In the actual detection process, the third light source 109 and the fourth light source 108 are alternately turned on in a time-sharing stroboscopic mode, and after the second camera 110 scans the surface to be detected along the long edge, the surface to be detected can be rotated by 90 degrees, and scanning detection is performed again. After the detection is finished, the product can be illuminated by light sources at two angles once when scanned, the second camera 110 can image the collision and scratch defects to generate a bright field image and a dark field image, the contrast of the defects is enhanced through the comprehensive contrast of the two images through an algorithm, and in addition, the line frequency of the black and white camera is very high, so that the time-sharing stroboscopic technology is tried out. The second camera 110 is used for detecting defect types such as foreign matters, white spots, pressure scars, indentations, scratches and the like (the glass surface of the rear plate of the mobile phone glass is made of frosted materials).
Based on this, by one-time scanning, the types of defects such as light different color points, heavy different color points, strip different colors, block different colors and the like can be detected by the first camera 103, the first light source 101 and the second light source 102 (the glass surface is made of frosted materials and the glass surface is made of mirror surfaces), and the types of defects such as foreign matters, white points, pressure scars, indentation, scratches and the like can be detected by the second camera 110, the third light source 109 and the fourth light source 108 (the glass surface of the rear plate of the mobile phone glass is made of frosted materials). And the third light source 109 and the fourth light source 108 are strobed in a time-sharing manner, so that the defect types are increased. Furthermore, by the arrangement of the visual imaging device 100, a plurality of defect types can be detected simultaneously, and the imaging system composed of the first camera 103, the first light source 101 and the second light source 102, and the imaging system composed of the second camera 110, the third light source 109 and the fourth light source 108 are independent and do not interfere with each other. The repeated complication of detecting and scanning the surface to be measured 105 once for each defect in the prior art is avoided.
EXAMPLE III
The light-colored product glass has high reflection rate of ink (white and pink) below the glass, and can submerge the defects of scratch, pressure damage and the like on the surface of the glass, so that the contrast of the defects is extremely low, and relevant detection cannot be carried out. For the glass surface made of a mirror surface material, the types of defects such as scratches, crush damage, concave-convex points and the like can be detected by the visual imaging device provided by the third embodiment.
Optionally, the third light source is a collimated light source.
Optionally, the third included angle is 15 ± 5 degrees.
Optionally, the second camera is a black and white line scan camera.
To distinguish from the naming in embodiment two, the third light source is renamed as a fifth light source, the third angle is renamed as a fifth angle, and the second camera is renamed as a third camera in fig. 3.
Fig. 3 is a schematic structural diagram of a visual imaging apparatus according to a third embodiment of the present invention. As shown in fig. 3, the visual imaging apparatus 200 includes:
a fifth light source 201 and a third camera 202, where the fifth light source 201 is configured to provide a fifth detection light beam 203 to a detection area on the surface to be detected 105 along a fifth direction, an included angle between the fifth direction and the surface to be detected 105 is a fifth included angle α 5, an included angle between an optical axis of the third camera 202 and the surface to be detected 105 is a sixth included angle α 6, and the fifth included angle α 5 is the same as the sixth included angle α 6;
wherein the fifth light source 201 is a collimated light source.
Optionally, the fifth included angle α 5 and the sixth included angle α 6 are both 15 ± 5 degrees (preferably 15 degrees).
Optionally, the third camera 202 is a black and white line scan camera.
Note that the fifth angle α 5 and the sixth angle α 6 are the same, and further, the fifth light source 201 forms a bright field light source of the third camera 202. The fifth light source 201 may include a beam splitter, a reflector, a fresnel prism, or a light-gathering rod to collimate the LED light source, and the collimated light source may enhance the directivity of the light source, so that the directivity of the fifth detection light beam 203 is stronger, and the divergence angle is smaller.
In the detection process, after the detection of the long edge of the surface to be detected 105 is finished, the product needs to be rotated by 90 degrees, and then the surface to be detected 105 is detected. Because many defects have directionality, the partial defect imaging contrast ratio can be improved after the product is scanned twice in the transverse and longitudinal directions.
This vision image device 200 just corresponds mirror surface glass back cover and is the formation of image of light colour (white, pink) product defect, because the product glass below printing ink (white, pink) reflection rate of light colour is high, can submerge defects such as glass surface fish tail, crushing to defect contrast is extremely low, can't carry out relevant detection, and the defect type that corresponds the detection is: (the glass surface is a mirror surface) scratch, crush damage, concave-convex points and other defect types.
In the foregoing three embodiments, the resolutions of the first camera 101, the second camera 110, and the third camera 202 are all 8 k. After the third light source 109 and the fourth light source 108 in the second embodiment are turned on, or after the fifth light source 201 in the third embodiment is turned on, when the first camera 103 acquires an image of the surface 105 to be measured, the brightness is higher, the exposure time is reduced, and the detection speed of the visual detection device is improved.
In summary, according to the utility model provides a visual imaging device, include: a first light source, a second light source, and a first camera; the first light source is used for providing a first detection light beam to a detection area on the surface to be detected along a first direction, and the second light source is used for providing a second detection light beam to the detection area along a second direction; an included angle between the first direction and the surface to be detected is a first included angle, an included angle between the second direction and the surface to be detected is a second included angle, the first included angle and the second included angle are the same and are larger than 0 degree, and the first light source and the second light source are symmetrically arranged along the central axis of the surface to be detected; the optical axis of the first camera coincides with the central axis of the surface to be detected, so that the phenomenon of missing detection in manual detection can be avoided, and various defects of the mobile phone glass rear plate can be automatically detected through the visual imaging device.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (10)
1. A visual imaging apparatus, comprising: a first light source, a second light source, and a first camera;
the first light source is used for providing a first detection light beam to a detection area on the surface to be detected along a first direction, and the second light source is used for providing a second detection light beam to the detection area along a second direction; an included angle between the first direction and the surface to be detected is a first included angle, an included angle between the second direction and the surface to be detected is a second included angle, the first included angle and the second included angle are the same and are larger than 0 degree, and the first light source and the second light source are symmetrically arranged along the central axis of the surface to be detected; the optical axis of the first camera coincides with the central axis of the surface to be measured.
2. A visual imaging apparatus as claimed in claim 1, wherein said first angle and said second angle are both 75 ± 5 degrees.
3. A visual imaging apparatus as claimed in claim 1, wherein said first camera is a colour line scan camera.
4. The visual imaging apparatus of claim 2, further comprising: a third light source and a second camera;
the third light source is used for providing a third detection light beam to the detection area along a third direction; an included angle between the third direction and the surface to be measured is a third included angle, and the third included angle is smaller than the first included angle; and the included angle between the optical axis of the second camera and the surface to be detected is the same as the third included angle.
5. The visual imaging apparatus of claim 4, further comprising: and the fourth light source is used for providing a fourth detection light beam to a detection area on the surface to be detected along a fourth direction, the fourth direction and the included angle of the surface to be detected are a fourth included angle, the fourth included angle is smaller than the third included angle, and the fourth light source and the third light source are alternately lightened.
6. The visual imaging apparatus of claim 5, further comprising: a strobe controller for controlling the third light source and the fourth light source to be alternately lit.
7. A visual imaging apparatus according to claim 5, wherein said third included angle is 45 ± 5 degrees and said fourth included angle is 20 ± 5 degrees.
8. The visual imaging apparatus of claim 4, wherein the third light source is a collimated light source.
9. A visual imaging apparatus as claimed in claim 8, wherein said third included angle is 15 ± 5 degrees.
10. A visual imaging apparatus according to any one of claims 4-9, wherein said second camera is a black and white line scan camera.
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| CN202123230014.7U CN217277920U (en) | 2021-12-21 | 2021-12-21 | Visual imaging device |
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| CN202123230014.7U CN217277920U (en) | 2021-12-21 | 2021-12-21 | Visual imaging device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115901776A (en) * | 2022-11-02 | 2023-04-04 | 富翔精密工业(昆山)有限公司 | Detection device and detection method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115901776A (en) * | 2022-11-02 | 2023-04-04 | 富翔精密工业(昆山)有限公司 | Detection device and detection method |
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