CN113030122A - Light beam laser printing detection device and method based on cylindrical lens array - Google Patents
Light beam laser printing detection device and method based on cylindrical lens array Download PDFInfo
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- CN113030122A CN113030122A CN202110379065.1A CN202110379065A CN113030122A CN 113030122 A CN113030122 A CN 113030122A CN 202110379065 A CN202110379065 A CN 202110379065A CN 113030122 A CN113030122 A CN 113030122A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/956—Inspecting patterns on the surface of objects
Abstract
The application discloses a light beam laser printing detection device and method based on a cylindrical lens array, wherein the device comprises the cylindrical lens array, a linear light source and a camera; the cylindrical lens array is arranged right above the detection surface of the light beam laser printing product in parallel, is a transparent base material and is used for shaping diffraction light rays in different directions; the linear light source is arranged right above the cylindrical lens array and used as front light to provide illumination light for detecting a light column laser printing product; the camera is arranged above the linear light source, the CCD direction of the camera is parallel to the long column direction of the column lens array, and the camera is used for generating an image to be detected according to received real-time reflection shaping light from the column lens array and sending the image to be detected to the image processing system; the method comprises the steps of receiving and storing an image to be detected, and judging a final positive waste result according to the image to be detected. The application eliminates the influence of the laser effect on imaging detection in laser printing products.
Description
Technical Field
The application relates to the technical field of laser printing, in particular to a laser printing detection device and method for a light beam based on a cylindrical lens array.
Background
The laser printing process has gorgeous visual effect and unique anti-counterfeiting function, and is a special printing process commonly used in daily use, cigarette packets, wine boxes and other packaging products. The laser printing process adopts computer and dot matrix photoetching technology, 3D true color holographic technology, multiple and dynamic imaging technology and the like, forms a hologram with rainbow dynamic and three-dimensional effects through mould pressing, and prints on the surface of a product in the modes of compounding, transferring, hot stamping and the like to obtain various laser effects.
The laser with light beam is a laser with wide application in various laser effects. The surface of the light beam laser product is provided with molded grating lines which are equivalent to a reflection grating, and the grating constant of the reflection grating is generally 20-30 um. After the incident light emitted by the light source is reflected by the reflection grating, diffraction light is formed on the surface of the product and is observed and received, namely the surface of the product is shown to have strip-shaped bright patterns with different brightness.
Because the characteristics of light beam laser product are that the laser effect on its surface has different colours or luminance in different areas, therefore the formation of image grey scale and formation of image colour variation of product different areas under the current detection scheme lead to laser printing product to obtain good detection effect difficultly. In the existing detection scheme, the imaging effect of a dome light source on various light beam laser products is optimal, the influence of laser on imaging cannot be completely eliminated, the detection of a laser part and a common printing part of the products cannot be compatible, and the detection accuracy is low.
Disclosure of Invention
The application provides a laser printing detection device and method of light beam based on cylindrical lens array to solve the problem that the detection method of the laser product of the light beam in the prior art can not completely eliminate the influence of laser on imaging, can not be compatible with the detection of the laser part and the common printing part of the product, and has low detection precision.
The technical scheme adopted by the application is as follows:
a light beam laser printing detection device based on a cylindrical lens array comprises a cylindrical lens array 2, a linear light source 3 and a camera 4;
the cylindrical lens array 2 is arranged right above the detection surface 1 of the light beam laser printing product in parallel, the cylindrical lens array 2 is a transparent base material, the height from the cylindrical lens array 2 to the detection surface 1 is 2-10mm, and the cylindrical lens array is used for shaping diffraction light rays in different directions;
the linear light source 3 is arranged right above the cylindrical lens array 2, and the included angle between the light emitting angle of the linear light source 3 and the normal vector of the detection surface 1 is 0-50 degrees when the linear light source 3 is used as front light to provide illumination light for detecting a light beam laser printing product;
the camera 4 is arranged above the linear light source 3, the CCD direction of the camera 4 is parallel to the long column direction of the cylindrical lens array 2, and the camera 4 is used for generating an image to be detected according to received real-time reflected and shaped light rays from the cylindrical lens array 2 and sending the image to be detected to the image processing system 5.
Preferably, the cylindrical lens array 2 comprises 2 or more cylindrical lenses distributed in parallel and at equal intervals, and the diameter of the cylindrical lens is 100-700 um.
Preferably, the cylindrical lens transverse cross-sectional shape includes a semicircular shape or a sine cosine shape.
Preferably, the overall width of the cylindrical lens array 2 is not less than 5mm, and the overall thickness is 2-10 mm.
Preferably, the linear light source 3 is an LED light source or a fluorescent tube and a combination light source thereof.
Preferably, the camera 4 is a line camera, and an included angle between the line camera and a normal vector of the detection surface 1 is 5-50 degrees.
Preferably, an image processing system 5 is also included;
the image processing system 5 comprises an image transmission module, an image storage module and an image detection module;
the image transmission module is used for receiving the image to be detected generated by the camera 4;
the image storage module is used for storing the image to be detected;
and the image detection module is used for judging a final positive waste product result according to the image to be detected.
A light beam laser printing detection method based on a cylindrical lens array is applied to the light beam laser printing detection device based on the cylindrical lens array, and the method comprises the following steps:
receiving the image to be detected generated by the camera 4;
storing the image to be detected;
and judging a final positive waste product result according to the image to be detected.
The technical scheme of the application has the following beneficial effects:
1. the device and the method for detecting the laser printing of the light beam based on the cylindrical lens array start from a diffraction light field on the surface of a laser product of the light beam, the cylindrical lens array is placed above a detection surface to shape diffraction light rays in different directions, and the brightness of different areas is homogenized, so that the influence of laser on the imaging of the printed product is eliminated. Meanwhile, because the cylindrical lens array is made of transparent materials, the normally reflected light rays are not scattered for the second time, and the image formation of the printed image-text is not influenced.
2. The light beam laser printing detection device and method based on the cylindrical lens array are compatible with detection of a product laser part and a common printing part, and detection of non-laser pictures and texts is not affected while laser effect is eliminated.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a laser printing and detecting device for light beam based on a cylindrical lens array according to the present application;
FIG. 2 is a schematic structural diagram of an array of non-cylindrical lenses in a reflected light path according to an embodiment of the present disclosure;
FIG. 3 is a schematic structural diagram of a reflective optical path with a cylindrical lens array according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of a cross-sectional shape of a sine-cosine cylindrical lens according to the present application;
FIG. 5 is a schematic diagram of the lateral cross-sectional shape of a semi-circular cylindrical lens according to the present application;
illustration of the drawings:
the system comprises a detection surface 1, a cylindrical lens array 2, a linear light source 3, a camera 4 and an image processing system 5.
Detailed Description
Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following examples do not represent all embodiments consistent with the present application. But merely as exemplifications of systems and methods consistent with certain aspects of the application, as recited in the claims.
Referring to fig. 1, a schematic structural diagram of a laser printing and detecting device for light beam based on a cylindrical lens array according to the present application is shown.
The application provides a light beam laser printing detection device based on a cylindrical lens array, which comprises a cylindrical lens array 2, a linear light source 3 and a camera 4;
the cylindrical lens array 2 is arranged right above the detection surface 1 of the light beam laser printing product in parallel, the cylindrical lens array 2 is a transparent base material, the height from the cylindrical lens array 2 to the detection surface 1 is 2-10mm, and the cylindrical lens array is used for shaping diffraction light rays in different directions;
the linear light source 3 is arranged right above the cylindrical lens array 2, and the included angle between the light emitting angle of the linear light source 3 and the normal vector of the detection surface 1 is 0-50 degrees when the linear light source 3 is used as front light to provide illumination light for detecting a light beam laser printing product;
the camera 4 is arranged above the linear light source 3, the CCD direction of the camera 4 is parallel to the long column direction of the cylindrical lens array 2, and the camera 4 is used for generating an image to be detected according to received real-time reflected and shaped light rays from the cylindrical lens array 2 and sending the image to be detected to the image processing system 5.
In this embodiment, the laser printed product is a silver cardboard with a light beam film covering and transferring, and the surface grating constant is 20um, and the grating period is 360 degrees rotation. The cylindrical lens array 2 is made of transparent PMMA material, so that normally reflected light rays are not scattered for the second time, and the image formation of the printed image and text of the product is not influenced. The base material of the cylindrical lens array 2 is parallel to the detection surface 1, and the long column direction of the cylindrical lens array 2 is parallel to the CCD direction of the camera 4. Incident light rays emitted by the linear light source 3 are reflected on the surface of a laser product, and the reflected light rays are interfered and diffracted due to the influence of the laser grating on the surface of the product to form diffraction light rays with the brightness distributed. When the diffracted light passes through the cylindrical lens array 2 above the laser product, secondary scattering and reshaping are carried out in a small range, a diffraction field is damaged, finally, the reflected light received by the camera 4 is the reshaped light, the laser effect is eliminated, and the detection of a laser printed product is not influenced by laser.
Further, the cylindrical lens array 2 comprises 2 or more cylindrical lenses distributed in parallel and at equal intervals, and the diameter of the cylindrical lenses is 100-700 um.
Further, as shown in fig. 4 and 5, the cylindrical lens has a transverse cross-sectional shape including, but not limited to, a semi-circular shape or a sine-cosine shape, and can shape diffracted light in different directions to homogenize brightness of different areas, thereby eliminating the influence of laser on the imaging of the printed product.
Further, the overall width of the cylindrical lens array 2 is not less than 5mm, and the overall thickness is 2-10 mm.
Further, the linear light source 3 may be an LED light source, a fluorescent tube, or a combination thereof, or may be another light source capable of emitting stable front illumination light.
Further, the camera 4 is a line camera, an included angle between the line camera and a normal vector of the detection surface 1 is 5-50 degrees, and the received real-time reflected and shaped light from the cylindrical lens array 2 can be generated into an image to be detected.
Further, an image processing system 5 is also included;
the image processing system 5 comprises an image transmission module, an image storage module and an image detection module;
the image transmission module is used for receiving the image to be detected generated by the camera 4 and can be a wireless network transmission device or be used for transmitting the image through a data line;
the image storage module is used for storing the image to be detected and can be a memory card;
the image detection module is configured to determine a final positive and negative result according to the image to be detected, and may be a processor or a processing chip having an image recognition detection function, or other devices that can implement the function, which is not described in detail in this embodiment.
A light beam laser printing detection method based on a cylindrical lens array is applied to the light beam laser printing detection device based on the cylindrical lens array, and the method in the embodiment comprises the following steps:
step 1, an image transmission module in the image processing system 5 receives the image to be detected generated by the camera 4;
and 3, judging a final positive waste product result by an image detection module in the image processing system 5 according to the image to be detected.
As shown in fig. 2, when the cylindrical lens array 2 is not placed in the reflection light path, the linear light source 3 directly emits incident light to the laser printed product on the detection surface 1, the incident light is reflected on the laser grating on the surface of the laser printed product, and the reflected light received by the camera 4 is the diffraction light modulated by the laser grating, so that the imaging gray level has obvious cylindrical fluctuation, and the method is not suitable for product quality detection.
As shown in fig. 3, the cylindrical lens array 2 is added to the reflected light path, the cylindrical lens array 2 is placed in parallel right above the detection surface 1 of the light beam laser printing product, the cylindrical lens array 2 is a transparent PMMA substrate and has a height from the detection surface 1 of 2-10mm, the cylindrical lens array 2 comprises 2 or more cylindrical lenses distributed in parallel at equal intervals, the diameter of the cylindrical lens is 100 μm and 700 μm, the transverse cross section of the cylindrical lens is semicircular or sine cosine, the overall width of the cylindrical lens array 2 is not less than 5mm, and the overall thickness is 2-10 mm; the linear light source 3 is an LED light source or a fluorescent tube and a combined light source thereof, and the included angle between the light-emitting angle and the normal vector of the detection surface 1 during illumination is 0-50 degrees; the camera 4 is a linear array camera, an included angle between the linear array camera and the normal vector of the detection surface 1 is 5-50 degrees, reflected light received by the camera 4 is shaped light, the imaging gray scale of the image to be detected is detected by the image processing system 5 to have no visible gray scale fluctuation, and the imaging requirement of product quality detection can be met.
The light beam laser printing detection device and method based on the cylindrical lens array starts from a diffraction light field on the surface of a light beam laser product, the cylindrical lens array is placed above a detection surface to shape diffraction light rays in different directions, and the brightness of different areas is homogenized, so that the influence of laser on the imaging of the printed product is eliminated. Meanwhile, because the cylindrical lens array is made of transparent materials, the normally reflected light rays are not scattered for the second time, and the image formation of the printed image-text is not influenced.
The light beam laser printing detection device and method based on the cylindrical lens array are compatible with detection of a product laser part and a common printing part, and detection of non-laser pictures and texts is not affected while laser effect is eliminated.
The embodiments provided in the present application are only a few examples of the general concept of the present application, and do not limit the scope of the present application. Any other embodiments extended according to the scheme of the present application without inventive efforts will be within the scope of protection of the present application for a person skilled in the art.
Claims (8)
1. A laser printing detection device of a light beam based on a cylindrical lens array is characterized by comprising a cylindrical lens array (2), a linear light source (3) and a camera (4);
the cylindrical lens array (2) is arranged right above the detection surface (1) of the light beam laser printing product in parallel, the cylindrical lens array (2) is a transparent base material, the height from the cylindrical lens array (2) to the detection surface (1) is 2-10mm, and the cylindrical lens array is used for shaping diffraction light rays in different directions;
the linear light source (3) is arranged right above the cylindrical lens array (2), and an included angle between a light-emitting angle of the linear light source (3) and a normal vector of the detection surface (1) is 0-50 degrees when the linear light source is used as front light to provide illumination light for detecting a laser printing product of a light beam;
the camera (4) is arranged above the linear light source (3), the CCD direction of the camera (4) is parallel to the long column direction of the column lens array (2), and the camera is used for generating an image to be detected according to received real-time reflection shaping light from the column lens array (2) and sending the image to be detected to the image processing system (5).
2. The apparatus as claimed in claim 1, wherein the cylindrical lens array (2) comprises at least 2 cylindrical lenses arranged in parallel and at equal intervals, and the diameter of the cylindrical lenses is 100-700 um.
3. The apparatus of claim 2, wherein the cross-sectional shape of the cylindrical lens array includes a semi-circular shape or a sine cosine shape.
4. The cylindrical lens array-based laser printing detection device for light beam as claimed in claim 2, wherein the overall width of the cylindrical lens array (2) is not less than 5mm, and the overall thickness is 2-10 mm.
5. The laser printing detection device of light beam based on cylindrical lens array as claimed in claim 1, wherein said linear light source (3) is LED light source or fluorescent tube and their combination light source.
6. The laser printing inspection device of light beam based on cylindrical lens array as claimed in claim 1, wherein the camera (4) is a line camera, and the included angle between the line camera and the normal vector of the inspection surface (1) is 5-50 °.
7. The apparatus for detecting laser printing of light beam based on cylindrical lens array as claimed in claim 1, further comprising an image processing system (5);
the image processing system (5) comprises an image transmission module, an image storage module and an image detection module;
the image transmission module is used for receiving the image to be detected generated by the camera (4);
the image storage module is used for storing the image to be detected;
and the image detection module is used for judging a final positive waste product result according to the image to be detected.
8. A cylindrical lens array-based laser printing detection method for a light cylinder, which is applied to the cylindrical lens array-based laser printing detection device of any one of claims 1 to 6, and comprises the following steps:
receiving the image to be detected generated by the camera (4);
storing the image to be detected;
and judging a final positive waste product result according to the image to be detected.
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| CN202110379065.1A CN113030122A (en) | 2021-04-08 | 2021-04-08 | Light beam laser printing detection device and method based on cylindrical lens array |
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| CN202110379065.1A CN113030122A (en) | 2021-04-08 | 2021-04-08 | Light beam laser printing detection device and method based on cylindrical lens array |
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