WO2015074222A1 - Laser marking method - Google Patents

Abstract

A laser marking method uses a laser source (1) and a scan mirror (3), comprising: opening the laser source (1) for outputting a laser in constant power; and based on all pixel points of a pre-entered pattern and a scan order, illuminating a physical carrier with the laser point by point according to X and Y coordinates, wherein illumination time Ti of a coordinate point of each position is calculated based on a gray scale value of a corresponding pixel point: the deeper a gray scale is, the longer the illumination time Ti is, and the lighter the gray scale is, the shorter the illumination time Ti is. This makes a scan speed changes with different image gray scales. The scan speed is slow in a place with a deep gray scale, and the scan speed is fast in a place with a light gray level. The laser marking method does not require an expensive laser source, and production efficiency is high.

Description

 Laser marking method Technical field

 The invention relates to marking and laser scanning, in particular to a laser marking method.

Background technique

Traditional marking methods include corrosion, EDM, mechanical scoring, printing, inefficiency and contamination. Laser marking technology has been widely used in all walks of life, opening up broad prospects for high-quality, high-efficiency, pollution-free and low-cost modern processing and production.

Laser marking means that the galvanometer motor drives the mirror to reflect the laser for scanning, which is green and environmentally friendly, but the production equipment is too high. The specific principle of laser marking is: the laser beam is incident on two mirrors (scanning mirror), and the reflection angle of the mirror is controlled by a computer. The two mirrors can be scanned along the X and Y axes respectively to achieve the deflection of the laser beam. The laser focus point with a certain power density is moved on the marking material as required, leaving a permanent mark on the surface of the material.

Scanning control is the core technology of laser marking, and scanning is first used in displays, and is now widely used in various image processing and digital imaging. The current scanning is also based on the scanning in the earliest display: using the principle of visual persistence, the electron beam is periodically moved on the screen of the camera tube or the picture tube. In order to ensure the imaging effect, the period is constant and the scanning rate is constant.

Now, all existing laser marking equipments have lasers on the marked object that are also scanning at a constant rate and constant rate. By changing the point power of the laser over time, the depth of the object is different. The method of imprinting. In this way, the laser source is required to have a variable transmission power, and the laser source is required to respond quickly to the transmission power change command. However, the laser source produced in China is still not available, and the performance index is stable and the continuous use time exceeds 1W hours, the working power reaches 30W, the price is 10W ¥, similar foreign laser source can reach, its performance index is 300W, but its price is 100W$. This has made it impossible for domestic manufacturers to compete, so the price of laser marking equipment is prohibitive. Moreover, this constant velocity method does not make full use of the laser emission power, and the production efficiency is low.

technical problem

The technical problem to be solved by the present invention is how to provide a laser marking method, which can break through the limitations of traditional scanning and reduce the requirements on the laser source, so that the domestic laser source can also meet the laser marking, fill the domestic blank, and greatly reduce the equipment cost. And improve efficiency, so that it can be widely promoted.

Technical solution

The above technical problem of the present invention is solved by constructing a laser marking method using a laser source and a scanning mirror, which are characterized in that the following steps are included:

Turn on the laser source to output the laser at a constant power;

The XY coordinate laser is irradiated point by point on the physical carrier based on the scanning order of all the pixels in advance. The irradiation time Ti of each position coordinate point is calculated according to the gray value of the corresponding pixel: the darker the gray, the irradiation time Ti The longer or the lighter the gradation, the shorter the irradiation time Ti.

According to the laser marking method provided by the present invention, the scanning includes, but is not limited to, the following specific manners:

(1) The scanning sequence is from top to bottom and from left to right;

(2) The scanning sequence is from bottom to top and from right to left;

(3) The scanning sequence is a progressive scan.

According to the laser marking method provided by the present invention, the laser marking method preferably calculates the irradiation time Ti while irradiating, and increases the processing speed.

According to the laser marking method provided by the present invention, the point-by-point illumination is to irradiate all of the pixels of the input pattern in advance only once.

According to the laser marking method provided by the present invention, the laser marking method further comprises setting the sharpness: the higher the sharpness, the more all the pixels to be irradiated are obtained from the prior input pattern.

According to the laser marking method provided by the present invention, the laser marking method further comprises setting the laser output power: the greater the laser output power, the less the marking time; the laser output power is less than or equal to the maximum output of the laser source.

According to the laser marking method provided by the present invention, the laser marking method further comprises setting the material according to the type of the physical carrier, and the material comprises non-metal materials such as linen, paper, cork, etc., and even metal can be processed under sufficient energy.

According to the laser marking method provided by the present invention, the laser marking method further comprises controlling the processing effect according to the set scanning speed and frequency.

According to the laser marking method provided by the present invention, the formula used in the calculation is Ti= k(Gray(x, y)); where: K refers to the gray scale effect scale factor, Gray refers to the gray scale distribution function, and X, Y is the coordinate coefficient.

Beneficial effect

The laser marking method provided by the invention breaks through the traditional scanning technology and has the following outstanding advantages compared with the prior art:

1, The cost of the equipment is reduced, and the light source is used efficiently. Under the condition of ensuring the same effect, the domestic laser of 100W can be used to complete the effect of importing the laser 250W in the same time;

2. Increase production efficiency by ten times;

3. Promote large-scale promotion of new green technologies.

DRAWINGS

The invention will be further described in detail below with reference to the drawings and specific embodiments.

1 is a schematic structural view of a laser marking device according to the present invention;

2 is a schematic diagram of a marking control flow of the apparatus shown in FIG. 1;

FIG. 3 is a schematic flow chart of the scanning subroutine of FIG. 2.

Wherein the reference numerals are: laser source 1, lens 2, scanning mirror 3, scanning platform 4.

BEST MODE FOR CARRYING OUT THE INVENTION

As shown in FIG. 1 , the laser marking device provided by the present invention is mainly composed of a laser source 1, a lens 2, a scanning mirror 3 and a scanning platform 4 on which a physical carrier is placed, and a high-energy laser is mounted on a physical carrier in the scanning platform 4. Irradiation, scanning, forming a marking pattern or character.

As shown in FIG. 2, the marking control program of the laser marking device of the present invention comprises the following steps:

201) start;

202) input a graphic, text or logo to be processed;

203) setting definition, scanning speed, laser power, material and frequency through the man-machine interface;

204) turning on the galvanometer power source and the laser source power source;

205) while calculating Ti, side scan; where Ti = k (Gray (x, y));

 Where Ti = Laser Time

 K = gray scale effect scale factor

 Gray=gray distribution function

 X, Y coordinate coefficient

206) The scanning is completed.

As shown in FIG. 3, the scanning subroutine in the marking control program of the laser marking device of the present invention comprises the following steps:

301) begins;

302) scanning initial position coordinates (i=1);

303) Determine whether the current irradiation time is Ti? Yes, go to the next step, otherwise return to this step;

304) Determine if i=END? Yes, go to the next step, otherwise scan the next position coordinates (i = i + 1), go to step 303);

305) All irradiation points are calculated and processed.

Embodiments of the invention

Industrial applicability

The laser marking method of the invention is suitable for laser marking equipment, which greatly reduces the requirement of the laser source, reduces the cost of the laser marking equipment by ten times according to the current market price, and increases the production speed of the marking by ten times, thereby enabling a large area. Promote laser marking instead of traditional methods to achieve very good green and environmental protection effects.

Sequence table free content

Claims (10)

 A laser marking method using a laser source and a scanning mirror, characterized in that it comprises the following steps: Turn on the laser source to output the laser at a constant power; The XY coordinate laser is irradiated point by point on the physical carrier based on the scanning order of all the pixels in advance. The irradiation time Ti of each position coordinate point is calculated according to the gray value of the corresponding pixel: the darker the gray, the irradiation time Ti The longer it is. The laser marking method according to claim 1, wherein said scanning order is from top to bottom and from left to right. The laser marking method according to claim 1, wherein said scanning order is from bottom to top and from right to left. A laser marking method according to claim 1, wherein said scanning order is a progressive reciprocal scanning. The laser marking method according to any one of claims 1 to 4, characterized in that the laser marking method calculates the irradiation time based on the fixed ratio data. The laser marking method according to claim 5, wherein said point-by-point illumination is performed only once for all pixel points of the input pattern in advance. The laser marking method according to claim 6, wherein the laser marking method further comprises setting the sharpness: the higher the sharpness, the more all the pixels to be irradiated are obtained from the input pattern beforehand. The laser marking method according to claim 6, wherein the laser marking method further comprises setting a laser output power: the larger the laser output power, the less the marking time; the laser output power is less than or equal to the laser source. Maximum output. The laser marking method according to claim 6, wherein the laser marking method further comprises: setting a material according to a physical carrier type, the material comprising a non-metallic material such as burlap, paper, cork, etc., and having sufficient energy at the light source and sufficient scanning head In the case of carrying capacity, it can be adapted to many materials. The laser marking method according to claim 9, wherein the laser marking method further comprises adjusting the peak power of the laser according to the set scanning speed and the frequency, thereby achieving the purpose of controlling the processing effect.

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