CN113977097B - Method for preparing marking pattern on polyimide surface based on femtosecond laser processing - Google Patents
Method for preparing marking pattern on polyimide surface based on femtosecond laser processing Download PDFInfo
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- CN113977097B CN113977097B CN202111425717.7A CN202111425717A CN113977097B CN 113977097 B CN113977097 B CN 113977097B CN 202111425717 A CN202111425717 A CN 202111425717A CN 113977097 B CN113977097 B CN 113977097B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/362—Laser etching
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
- B23K26/0652—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms comprising prisms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/40—Removing material taking account of the properties of the material involved
- B23K26/402—Removing material taking account of the properties of the material involved involving non-metallic material, e.g. isolators
Abstract
A method for preparing a marked pattern on the surface of polyimide based on femtosecond laser processing comprises the steps of firstly adopting a polyimide film with the thickness of 125 mu m as a sample; then, a light path is set up, a femtosecond laser is adjusted by a computer to output laser, the laser wavelength is 800nm, the pulse width is 120fs, the repetition frequency is 1kHz, and the maximum single-pulse energy is 5 mJ; fixing the sample on a processing station of the scissor-type lifting table, and adjusting laser energy and scanning speed to obtain a traditional marking pattern and a color code pattern on the sample; the processed surface of the traditional mark is covered with a micro-nano irregular structure, and the micro-nano structure has an anti-reflection effect, so that the mark pattern recognition rate is improved; the color code pattern is divided into four parts according to colors for processing during preparation, black, yellow and purple parts are respectively extracted during identification, and then the black, yellow and purple parts are synthesized into the color code pattern; the invention can realize information tracing, storage and encryption on parts.
Description
Technical Field
The invention belongs to the technical field of laser pattern manufacturing, and particularly relates to a method for preparing a marked pattern on the surface of polyimide based on femtosecond laser processing.
Background
The traceability of parts is the guarantee of product quality, the key for realizing the real-time tracking of product information is to enable the product to have a unique identifier, and the two-dimension code becomes a product identifier and information tracing method which is widely applied at present. In order to increase the data density of the traditional two-dimensional code, people put forward a color code, namely, the color is added as a new one-dimensional color code, so that the color code can contain more information under the condition of keeping the size of the original two-dimensional code unchanged. Compared with the traditional two-dimensional code, the color code introduces more dimensions to express information, and the information storage density is greatly increased. As a way of transferring image information, a direct part marking technique of directly preparing a permanent mark on the surface of a part, which can be recognized by a machine, or an indirect part marking technique such as a labeling method or a bagging method is most commonly used.
Polyimide has excellent mechanical strength, thermal stability, corrosion resistance, electrical insulation and other properties, is one of polymer materials with the best comprehensive properties, and has wide application in the fields of microelectronic packaging, flexible display, aerospace and the like with excellent properties. In addition, polyimide is used as a substrate of various labels due to its outstanding heat resistance and excellent mechanical properties, and at present, main processing methods for this material are inkjet printing and laser processing; inkjet printing suffers from poor durability, contamination, the need for pre-treatment of the substrate, etc., while laser processing is primarily concerned with the synthesis and performance of materials, with less relevant discussion of the specific application of the pattern, and the predominantly black color achieved, essentially without color research.
In the part marking technology, laser processing is widely applied to various fields at present due to the characteristics of no limitation on material selection, high efficiency and high flexibility; and the femtosecond laser is more suitable for processing special parts due to the advantage of cold processing. At present, no relevant literature publication is found for realizing information storage and encryption by processing the polyimide surface with femtosecond laser to prepare a marking pattern.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method for preparing a marking pattern on the surface of polyimide based on femtosecond laser processing, which can trace, store and encrypt information of parts.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for preparing a marked pattern on the basis of femtosecond laser processing of a polyimide surface comprises the following steps:
1) a polyimide film with the thickness of 125 mu m is taken as a sample;
2) a light path is set up, output light of the femtosecond laser 1 sequentially passes through a first half-wave plate 2, a Glan Taylor prism 3, a second half-wave plate 4 and a small aperture diaphragm 5, and is finally focused on a shear type lifting platform 7 through a two-axis scanning galvanometer system 6, and the femtosecond laser 1 and the two-axis scanning galvanometer system 6 are connected with a computer;
3) adjusting the output laser of the femtosecond laser 1 by using a computer, wherein the laser wavelength is 800nm, the pulse width is 120fs, the repetition frequency is 1kHz, and the maximum single pulse energy is 5 mJ;
4) fix the sample on 7 processing stations on the formula elevating platform of cutting, adjust laser energy and scanning speed, obtain traditional mark pattern and color code pattern on the sample, the parameter of femto second laser preparation mark pattern is:
traditional marking pattern: the laser energy is 100mW, the scanning speed is 25-100mm/s, and the scanning distance is 5 mu m;
color code pattern: the laser energy is 100mW, the scanning speed is 25-100mm/s in black, the scanning speed is 125-200mm/s in yellow or purple, and the scanning interval is 5 μm.
The polyimide is a polyimide film with a full aromatic ring structure and can be used for a long time at the temperature of-269 ℃ to +280 ℃.
The surface of the traditional marking pattern is full of micro-nano irregular structures, and the micro-nano structures have the function of anti-reflection, so that the improvement of the identification rate of the marking pattern is facilitated.
When the color code pattern is processed, the color code is divided into four parts according to colors to be processed, the scanning speed when the black part is prepared is 25-100mm/s, the scanning speed when the yellow part and the purple part are 125-200mm/s, the white part is not processed, and the laser polarization direction when the yellow part is processed is vertical to the laser polarization direction when the purple part is processed.
The identification process of the color code pattern comprises the following steps: firstly, respectively extracting black, yellow and purple parts, and then synthesizing the parts into a color code pattern; the fixed observation angle is 0 ° and the moire direction angle is 90 °, when white light is irradiated on the vertical plane, a pattern having a horizontal direction of moire is displayed; when white light is irradiated on a horizontal plane, a pattern with vertical ripples is displayed; corresponding to the color of the color code, the white light is irradiated by an incident angle of 60 degrees on a vertical plane to obtain a yellow part, and is irradiated by an incident angle of 40 degrees on a horizontal plane to obtain a purple part; finally, the obtained three parts are combined to obtain the complete color code.
The invention has the beneficial effects that:
according to the invention, the femtosecond laser is adopted to process the polyimide surface, so that not only is the black surface of the traditional two-dimensional code obtained, but also the color surface with a corrugated structure is obtained. The traditional marking pattern and color code pattern prepared on the polyimide can be directly placed or adhered on the surface of a part and can resist the high temperature below 300 ℃. Since the polyimide substrate itself has a brownish yellow color and a low recognition speed, the problem of the slow recognition speed is solved by extracting the outline of the marking pattern and refilling the outline. For the preparation and identification of the color code pattern, a pattern decomposition method is adopted, and a good processing effect and a clear display effect are obtained. Therefore, the preparation of the traditional marking pattern and the color code pattern can be realized by processing the surface of the polyimide by adopting the femtosecond laser.
Drawings
FIG. 1 is a schematic diagram of the optical path of the present invention.
Fig. 2 is a schematic diagram illustrating the preparation of a conventional mark pattern on the surface of the polyimide according to the laser induction in example 1.
Fig. 3 is an enlarged view of a conventional marking pattern of example 1.
Fig. 4 is an enlarged view of the corrugated structure of example 2.
FIG. 5 is a schematic diagram of the preparation of color code pattern on the surface of the polyimide of example 2.
Fig. 6 is a schematic view of identifying a color code pattern on the surface of polyimide in embodiment 2.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
1) a polyimide film having a thickness of 125 μm was used as a sample;
2) building a light path, referring to fig. 1, outputting light of a femtosecond laser 1 sequentially passes through a first half-wave plate 2, a Glan Taylor prism 3, a second half-wave plate 4 and an aperture diaphragm 5, and finally is focused on a shear type lifting platform 7 through a two-axis scanning galvanometer system 6, wherein the femtosecond laser 1 and the two-axis scanning galvanometer system 6 are connected with a computer;
3) adjusting the output laser of the femtosecond laser 1 by using a computer, wherein the laser wavelength is 800nm, the pulse width is 120fs, the repetition frequency is 1kHz, and the maximum single pulse energy is 5 mJ;
4) fixing a sample on a processing station of a scissor-type lifting table 7, adjusting laser energy and scanning speed, and obtaining a traditional marking pattern on the sample, wherein the parameters of the traditional marking pattern prepared by femtosecond laser are as follows:
the laser energy is 100mW, the scanning speed is 50mm/s, and the scanning interval is 5 mu m.
Referring to fig. 2, the contrast between the conventional marking pattern obtained in this embodiment and the sample itself is very obvious, so that a marking pattern for information tracing can be obtained on the surface of polyimide; fig. 3 is an enlarged view of the conventional marking pattern in fig. 2, and it can be seen that the processed surface is a micro-nano irregular structure, and the micro-nano structure has an anti-reflection effect, so that the improvement of the identification rate of the marking pattern is facilitated.
Embodiment 2, a method for preparing a marking pattern based on femtosecond laser processing of a polyimide surface, comprising the steps of:
1) a polyimide film with the thickness of 125 mu m is taken as a sample;
2) a light path is built, referring to fig. 1, output light of a femtosecond laser 1 sequentially passes through a first half-wave plate 2, a Glan Taylor prism 3, a second half-wave plate 4 and an aperture diaphragm 5, and finally is focused on a shear type lifting platform 7 through a two-axis scanning galvanometer system 6, and the femtosecond laser 1 and the two-axis scanning galvanometer system 6 are connected with a computer;
3) adjusting the output laser of the femtosecond laser 1 by using a computer, wherein the laser wavelength is 800nm, the pulse width is 120fs, the repetition frequency is 1kHz, and the maximum single pulse energy is 5 mJ;
4) fixing a sample on a processing station of a scissor type lifting table 7, adjusting laser energy and scanning speed, obtaining a color code pattern on the sample, and firstly adjusting femtosecond laser parameters as follows:
the laser energy is 100mW, the scanning speed is 150mm/s, and the scanning distance is 5 mu m;
the obtained corrugated structure is shown in FIG. 4, and the corrugated structure is complete and uniform;
referring to fig. 5, when a color code pattern is processed, the color code is divided into four parts according to colors, the scanning distance is 5 μm by using 100mW of laser energy during processing, the scanning speed during preparing a black part is 50mm/s, the scanning speed during processing yellow and purple parts is 150mm/s, a white part is not processed, and the polarization direction of laser during processing the yellow part is perpendicular to that of laser during processing the purple part.
Referring to fig. 6, the process of identifying the color code pattern of the present embodiment is as follows: firstly, respectively extracting black, yellow and purple parts, and then synthesizing the parts into a color code pattern; because the black part is the darkest compared with other parts, the black part can be easily obtained from the color code real image; the directions of the ripples of the yellow part and the purple part are vertical to each other, so that the ripples can be easily distinguished by irradiating white light; the fixed observation angle is 0 ° and the ripple direction angle is 90 °, when white light is illuminated on a vertical plane, a pattern with ripples in the horizontal direction is displayed; when white light is irradiated on a horizontal plane, a pattern with vertical ripples is displayed; corresponding to the color of the color code, the white light irradiates at an incident angle of 60 degrees on a vertical plane to obtain a yellow part, and irradiates at an incident angle of 40 degrees on a horizontal plane to obtain a purple part; finally, the obtained three parts are combined to obtain the complete color code.
Example 3, the parameters of the conventional marking pattern in step 4) of examples 1 and 2 were changed to 100mW of laser energy, 25mm/s of scanning speed and 5 μm of scanning pitch; the parameters of the color code pattern are changed into: the laser energy was 100mW, the scanning speed was 25mm/s for black, 125mm/s for yellow or violet, and the scanning pitch was 5 μm.
The effect of this example is similar to that of example 1 and example 2.
Example 4, the parameters of the traditional marking pattern in step 4) of examples 1 and 2 are changed into 100mW of laser energy, 75mm/s of scanning speed and 5 μm of scanning interval; the color code pattern parameters are changed into: the laser energy was 100mW, the scanning speed was 75mm/s for black, 175mm/s for yellow or violet, and the scanning pitch was 5 μm.
The effect of this example is similar to that of example 1 and example 2.
Example 5, the parameters of the conventional marking pattern in step 4) of examples 1 and 2 were changed to 100mW of laser energy, 100mm/s of scanning speed and 5 μm of scanning pitch; the color code pattern parameters are changed into: the laser energy is 100mW, the scanning speed is 100mm/s for black, 200mm/s for yellow or purple and the scanning interval is 5 mu m.
The effect of this example is similar to that of example 1 and example 2.
Claims (3)
1. A method for preparing a marking pattern on the basis of femtosecond laser processing of a polyimide surface is characterized by comprising the following steps:
1) a polyimide film having a thickness of 125 μm was used as a sample;
2) a light path is set up, output light of a femtosecond laser (1) sequentially passes through a first half-wave plate (2), a Glan Taylor prism (3), a second half-wave plate (4) and an aperture diaphragm (5), and is finally focused on a shear type lifting platform (7) through a biaxial scanning galvanometer system (6), and the femtosecond laser (1) and the biaxial scanning galvanometer system (6) are connected with a computer;
3) a computer is utilized to adjust the femtosecond laser (1) to output laser, the laser wavelength is 800nm, the pulse width is 120fs, the repetition frequency is 1kHz, and the maximum single pulse energy is 5 mJ;
4) fixing a sample on a processing station of a scissor type lifting table (7), adjusting laser energy and scanning speed, and obtaining a traditional marking pattern and a color code pattern on the sample, wherein the parameters of the marking pattern prepared by femtosecond laser are as follows:
traditional marking pattern: the laser energy is 100mW, the scanning speed is 25-100mm/s, and the scanning distance is 5 mu m;
color code pattern: the laser energy is 100mW, the scanning speed is 25-100mm/s in black, the scanning speed is 125-200mm/s in yellow or purple, and the scanning interval is 5 mu m;
when the color code pattern is processed, the color code is divided into four parts according to colors to be processed, the scanning speed when the black part is prepared is 25-100mm/s, the scanning speed when the yellow part and the purple part are 125-200mm/s, the white part is not processed, and the laser polarization direction when the yellow part is processed is vertical to the laser polarization direction when the purple part is processed;
the identification process of the color code pattern comprises the following steps: firstly, respectively extracting black, yellow and purple parts, and then synthesizing the parts into a color code pattern; the fixed observation angle is 0 ° and the ripple direction angle is 90 °, when white light is illuminated on a vertical plane, a pattern with ripples in the horizontal direction is displayed; when white light is irradiated on a horizontal plane, a pattern with ripples in the vertical direction is displayed; corresponding to the color of the color code, the white light is irradiated by an incident angle of 60 degrees on a vertical plane to obtain a yellow part, and is irradiated by an incident angle of 40 degrees on a horizontal plane to obtain a purple part; finally, the obtained three parts are combined to obtain the complete color code.
2. The method of claim 1, wherein: the polyimide is a polyimide film with a full aromatic ring structure and can be used for a long time within the temperature range of-269 ℃ to +280 ℃.
3. The method of claim 1, wherein: the surface of the traditional marking pattern is fully distributed with the micro-nano irregular structure, and the micro-nano structure has the function of anti-reflection, thereby being beneficial to improving the identification rate of the marking pattern.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108637486A (en) * | 2018-05-30 | 2018-10-12 | 北京工业大学 | Color metal marking system and marking method |
| JP2021181112A (en) * | 2020-05-20 | 2021-11-25 | 伸之 金澤 | Laser color marking device |
| CN112496531B (en) * | 2020-11-24 | 2021-11-16 | 中国科学院西安光学精密机械研究所 | Integrated femtosecond laser marking method based on space shaping |
| CN112828481B (en) * | 2020-12-31 | 2022-05-03 | 武汉华工激光工程有限责任公司 | Method and system for processing and reading two-dimensional code in transparent material |
| CN112846490A (en) * | 2021-01-08 | 2021-05-28 | 西安交通大学 | Method for realizing information storage and encryption by preparing high-capacity color code based on femtosecond laser |
| CN112975142A (en) * | 2021-03-02 | 2021-06-18 | 北京航空航天大学杭州创新研究院 | Film material patterning processing method based on femtosecond laser controllable etching |
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