阅读说明：本技术 一种玻璃激光内雕微型二维码的方法 (Method for engraving micro two-dimensional code in glass laser ) 是由 王建刚 雷小锋 刘慧� 蒋东升 于 2018-06-25 设计创作，主要内容包括：本发明涉及激光雕刻的技术领域,具体涉及一种玻璃激光内雕微型二维码的方法。包括以下步骤：采用DATAMATRIX二维码制码方式生成圆模式的初始二维码图档；根据圆模式的初始二维码图档生成由多个独立单点构成的单点模式二维码图档；在单点模式二维码图档的每一个单点后设置一个加工延时参数,生成目标二维码图档；通过同轴CCD相机对玻璃样品进行定位,计算出待加工位置；调节光路使激光束的聚焦光斑尺寸小于标定值,将激光束的焦点移动至玻璃样品内部的待加工位置,按照目标二维码图档进行二维码加工。有效防止皮秒激光器作用时间极短情况下振镜造成的拖尾现象,使二维码小尺寸雕刻成为可能。(The invention relates to the technical field of laser engraving, in particular to a method for engraving a micro two-dimensional code in glass laser. The method comprises the following steps: generating an initial two-dimensional code drawing file of a circular mode by adopting a DATAMATRIX two-dimensional code making mode; generating a single-point mode two-dimensional code image file formed by a plurality of independent single points according to the initial two-dimensional code image file of the circular mode; setting a processing delay parameter behind each single point of the two-dimensional code image file in the single-point mode to generate a target two-dimensional code image file; positioning the glass sample through a coaxial CCD camera, and calculating a position to be processed; and adjusting a light path to enable the size of a focused light spot of the laser beam to be smaller than a calibration value, moving the focus of the laser beam to a position to be processed in the glass sample, and processing the two-dimensional code according to the target two-dimensional code image file. Effectively prevent the trailing phenomenon that the mirror that shakes caused under the extremely short condition of picosecond laser action time, make the small-size sculpture of two-dimensional code become possible.)

1. The method for engraving the micro two-dimensional code in the glass laser is characterized by comprising the following steps of:

step 1: generating an initial two-dimensional code drawing file of a circular mode by adopting a DATAMATRIX two-dimensional code making mode;

step 2: generating a single-point mode two-dimensional code image file formed by a plurality of independent single points according to the initial two-dimensional code image file of the circular mode;

and step 3: setting a processing delay parameter behind each single point of the two-dimensional code image file in the single-point mode to generate a target two-dimensional code image file;

and 4, step 4: positioning the glass sample through a coaxial CCD camera, and calculating a position to be processed;

and 5: and adjusting a light path to enable the size of a focused light spot of the laser beam to be smaller than a calibration value, moving the focus of the laser beam to a position to be processed in the glass sample, and processing the two-dimensional code according to the target two-dimensional code image file.

2. The method for engraving a micro two-dimensional code in a glass laser according to claim 1, wherein in the step 2, the method for generating a single-point mode two-dimensional code image file composed of a plurality of independent single points according to the initial two-dimensional code image file of the circular mode comprises the following steps:

filling an independent single point which is discontinuous with each other in the center of each circle of the initial two-dimensional code image file, reserving all the single points and deleting the initial two-dimensional code image file to form a single-point mode two-dimensional code image file formed by a plurality of independent single points.

3. The method for engraving a micro two-dimensional code in glass laser according to claim 1, wherein in the step 3, a processing delay parameter is set after each single point of the two-dimensional code image file in the single-point mode, and the method for generating the target two-dimensional code image file comprises the following steps:

combining the processing delay parameters of each single point and the single points together to generate a plurality of combinations a with the same number as the single points, and arranging the combinations a according to the sequence with the same direction of the galvanometer jumping during processing to generate a target two-dimensional code image file.

4. The method for engraving the micro two-dimensional code in the glass laser according to claim 1, wherein in the step 5: the method for adjusting the light path to make the focused spot size of the laser beam smaller than the calibration value comprises the following steps:

selecting a picosecond laser as a laser, and adjusting the beam diameter, the spot roundness, the pulse stability and the spot divergence angle of an outlet spot of the laser beam to ensure that the parameters meet the conditions that the beam diameter is less than or equal to 2mm, the spot roundness is more than or equal to 90 percent, the pulse stability is less than or equal to 1.5 percent rms and the spot divergence angle is less than or equal to 3 mrad;

according to the calculation formula of the diameter of the focused light spotThe light beam diameter, the light spot roundness, the pulse stability, the light spot divergence angle and the light path length of the outlet light spot are multiplied by the lens and the beam expander, so that the diameter of the light spot acting on the inside of the glass is not more than 10 mu m.

5. The method for engraving the micro two-dimensional code in the glass laser according to claim 1, characterized in that: the size of the target two-dimensional code image file is 0.10 x 0.10mm, and the target two-dimensional code image file contains not less than 20 characters.

6. The method for engraving the micro two-dimensional code in the glass laser according to claim 1, characterized in that: and the processing delay parameter is 200-1000 us.

7. The method for engraving the micro two-dimensional code in the glass laser according to claim 1, characterized in that: the output power of the laser is 0.5-2.5W.

Technical Field

The invention relates to the technical field of laser engraving, in particular to a method for engraving a micro two-dimensional code in glass laser.

Background

With the rapid development of internet technology and intelligent devices, information dissemination and identification have become one of the indispensable technologies of modern devices. Early barcodes were primarily printed on the surface of merchandise and were identified by machine scanning based on the principle of spectroscopy. One-dimensional bar codes have been widely used in the fields of warehousing, industrial production, book management and the like in the 80 s. The one-dimensional bar code has the defects of small data capacity, poor confidentiality, poor readability after defect and contamination and the like, and the demand of an information-based society is difficult to meet. The two-dimensional code is a comprehensive technology which integrates the technologies of information coding, information transmission, image processing, data encryption and the like and is developed on the basis of a one-dimensional bar code.

The two-dimensional code can be divided into a Matrix type and a line type, a Data Matrix code (DM code for short) is one of the Matrix type two-dimensional codes, the length and the width of each module are the same, the modules and the whole symbol generally appear in a square shape, and 256 characters in a standard and expanded ASCII character set can be coded.

Compared with the traditional printing two-dimensional code, the laser marking two-dimensional code has the advantages of small size, non-erasability, permanence, environmental protection and the like, and is widely applied to industrial production so as to achieve the purposes of sample tracing, anti-counterfeiting and the like. However, with the development of electronic information technology and the characteristics of transparent materials, the requirements for two-dimensional code anti-counterfeiting and identification are higher and higher.

The existing laser marking two-dimensional code is large, and the hiding performance is poor, so that the anti-counterfeiting effect is poor. And because receive the restriction of facula size, can lead to the constantly overlapping of facula if reduce two-dimensional code size, cause glass local pile up and the damage of explosion point, lead to its unable discernment. Meanwhile, when the two-dimensional code is small, the picosecond laser has extremely short action time, and the galvanometer on the current market cannot meet the high precision requirement and reaction time. Therefore, when a picosecond laser is adopted for scanning the small-size two-dimensional code, the phenomenon of trailing of the bottom of a point and overlapping of light spots caused by the influence of a galvanometer cannot be caused, and a clear and visible two-dimensional code cannot be obtained.

Disclosure of Invention

The invention aims to provide a method for engraving a micro two-dimensional code in glass laser, which can obtain a clear small-size two-dimensional code with good hiding performance, aiming at the defects of the prior art.

The technical scheme of the invention is as follows: a method for engraving a micro two-dimensional code in glass laser comprises the following steps:

step 1: generating an initial two-dimensional code drawing file of a circular mode by adopting a DATAMATRIX two-dimensional code making mode;

step 2: generating a single-point mode two-dimensional code image file formed by a plurality of independent single points according to the initial two-dimensional code image file of the circular mode;

and step 3: setting a processing delay parameter behind each single point of the two-dimensional code image file in the single-point mode to generate a target two-dimensional code image file;

and 4, step 4: positioning the glass sample through a coaxial CCD camera, and calculating a position to be processed;

and 5: and adjusting a light path to enable the size of a focused light spot of the laser beam to be smaller than a calibration value, moving the focus of the laser beam to a position to be processed in the glass sample, and processing the two-dimensional code according to the target two-dimensional code image file.

Preferably, in the step 2, the method for generating the single-point mode two-dimensional code image file composed of a plurality of independent single points according to the initial two-dimensional code image file of the circular mode includes:

filling an independent single point which is discontinuous with each other in the center of each circle of the initial two-dimensional code image file, reserving all the single points and deleting the initial two-dimensional code image file to form a single-point mode two-dimensional code image file formed by a plurality of independent single points.

Preferably, in step 3, a processing delay parameter is set after each single point of the two-dimensional code image file in the single-point mode, and the method for generating the target two-dimensional code image file includes:

combining the processing delay parameters of each single point and the single points together to generate a plurality of combinations a with the same number as the single points, and arranging the combinations a according to the sequence with the same direction of the galvanometer jumping during processing to generate a target two-dimensional code image file.

Preferably, in step 5: the method for adjusting the light path to make the focused spot size of the laser beam smaller than the calibration value comprises the following steps:

selecting a picosecond laser as a laser, and adjusting the beam diameter, the spot roundness, the pulse stability and the spot divergence angle of an outlet spot of the laser beam to ensure that the parameters meet the conditions that the beam diameter is less than or equal to 2mm, the spot roundness is more than or equal to 90 percent, the pulse stability is less than or equal to 1.5 percent rms and the spot divergence angle is less than or equal to 3 mrad;

according to the calculation formula of the diameter of the focused light spotThe light beam diameter, the light spot roundness, the pulse stability, the light spot divergence angle and the light path length of the outlet light spot are multiplied by the lens and the beam expander, so that the diameter of the light spot acting on the inside of the glass is not more than 10 mu m.

Preferably, the size of the target two-dimensional code image file is 0.10 × 0.10mm, and the target two-dimensional code image file contains not less than 20 characters.

Preferably, the processing delay parameter is 200-1000 us.

Preferably, the output power of the laser is 0.5-2.5W.

The invention has the beneficial effects that:

1. the single-point mode two-dimensional code picture file that the setting comprises a plurality of independent single points, and set up the time delay parameter behind every single point, make the mirror that shakes have sufficient reaction time, effectively prevent the trailing phenomenon that the mirror that shakes caused under the extremely short condition of picosecond laser instrument operating time, make the small-size sculpture of two-dimensional code become possible.

2. Through specific laser parameter combination, make the focus facula can reach less size, prevent the explosion point, both guaranteed that glassware's intensity is not influenced, guarantee again that two-dimensional code contrast is high.

3. The minimum two-dimensional code size contains the information that exceeds 20 bits, and carves clear no explosion point, and no trailing makes the good and scanning of being convenient for of two-dimensional code hiding nature.

Drawings

FIG. 1 is a flow chart of a method for engraving a micro two-dimensional code in a glass laser according to the invention;

FIG. 2 is a diagram of an initial two-dimensional code profile of the present invention;

FIG. 3 is a diagram of a target two-dimensional code file according to the present invention.

Detailed Description

The invention will be further described in detail with reference to the following drawings and specific examples, which are not intended to limit the invention, but are for clear understanding.

As shown in fig. 1, a method for engraving a micro two-dimensional code in a glass laser includes the following steps:

step 1: and generating an initial two-dimensional code drawing file of the circular mode by adopting a DATAMATRIX two-dimensional code making mode. As shown in fig. 2, the initial two-dimensional code image file of the circular pattern is a whole generated by software Ezcad through DATAMATRIX two-dimensional code making, and has a size of 0.10 × 0.10mm and contains not less than 20 characters (e.g. 12345678900123456789) inside.

Step 2: and generating a single-point mode two-dimensional code image file consisting of a plurality of independent single points according to the initial two-dimensional code image file of the circular mode. Filling an independent single point which is discontinuous with each other in the center of each circle of the initial two-dimensional code image file of the circle mode, reserving all the single points and deleting the initial two-dimensional code image file to form the single-point mode two-dimensional code image file formed by a plurality of independent single points.

And step 3: and setting a processing delay parameter behind each single point of the two-dimensional code image file in the single-point mode to generate a target two-dimensional code image file. As shown in fig. 3, the processing delay time parameters after each single point and single point are combined together to generate a plurality of combinations a with the same number as the single points, and the plurality of combinations a are arranged in the order with the same direction as the direction in which the galvanometer jumps during processing to form a target two-dimensional code image file. In the embodiment, the processing delay parameter is 200-1000 us.

And 4, step 4: and positioning the glass sample by a coaxial CCD camera, and calculating the position to be processed. The CCD system is used for positioning a product and performing self-checking and identification on the processed two-dimensional code.

And 5: and adjusting a light path to enable the size of a focused light spot of the laser beam to be smaller than a calibration value, moving the focus of the laser beam to a position to be processed in the glass sample, and processing the two-dimensional code according to the target two-dimensional code image file. The selected laser is a picosecond laser, and the laser beam output by the picosecond laser sequentially passes through the reflector, the beam expander, the scanning galvanometer, the beam focusing lens and the turning mirror to be focused and is vertical to the processing platform. The diameter of the light beam of the selected picosecond laser outlet light spot is less than or equal to 2mm, the roundness of the light spot is greater than or equal to 90%, the pulse stability is less than or equal to 1.5% rms, and the divergence angle of the light spot is less than or equal to 3 mrad. The calculation formula of the diameter of the focusing spot is as follows:

wherein M is²: laser mode parameters, λ: wavelength, f: lens focal length, D: exit spot diameter.

According to the calculation formula of the diameter of the focused light spotThe light beam diameter, the light spot roundness, the pulse stability, the light spot divergence angle and the light path length of the outlet light spot are multiplied by the lens and the beam expander, so that the diameter of the light spot acting on the inside of the glass is not more than 10 mu m. The spot diameter can be adjusted to 3um in this embodiment. And selecting proper parameters and adjusting a Z-axis control system to enable the focusing light spot to be positioned at the position to be processed in the glass material. And in the process of processing according to the target two-dimensional code image file by adopting a control variable method, parameters such as output power, processing times, time delay and the like of the laser are sequentially changed, the influence of the parameters on the generated two-dimensional code image is analyzed, and the optimal parameter combination is obtained so as to obtain the complete and clear two-dimensional code image visible under a microscope. In this embodiment, the output power of the laser is 0.5-2.5W, and the number of machining times is 1.

After the two-dimension code is processed, the obtained two-dimension code is amplified through a coaxial industrial camera on the platform, and the two-dimension code is scanned, identified and read through a vision system, so that the AOI self-checking function is achieved. And then carrying out high-temperature strengthening, placing the blank sample and the high-temperature strengthening on a universal material testing machine for strength testing, and carrying out data analysis to ensure that the blank sample and the high-temperature strengthening have no obvious difference.

Details not described in this specification are within the skill of the art that are well known to those skilled in the art.