CN113399821A

CN113399821A - Laser bitmap marking device and laser bitmap marking method

Info

Publication number: CN113399821A
Application number: CN202110590098.0A
Authority: CN
Inventors: 徐方华; 郭丽; 吕启涛; 王杰; 刘欢; 高云峰
Original assignee: Han s Laser Technology Industry Group Co Ltd
Current assignee: Han s Laser Technology Industry Group Co Ltd
Priority date: 2021-05-28
Filing date: 2021-05-28
Publication date: 2021-09-17
Anticipated expiration: 2041-05-28
Also published as: CN113399821B

Abstract

The invention discloses a laser bitmap marking device and a laser bitmap marking method, wherein the laser bitmap marking device comprises a laser source, a first Q driver, a second Q driver, a first acousto-optic modulator, a second acousto-optic modulator, an output control head and a controller; laser emitted by the laser source is output to the first acousto-optic modulator, the frequency is adjusted by the first Q driver in the first acousto-optic modulator to form stable laser with preset frequency, the stable laser enters the second acousto-optic modulator, the energy is adjusted by the second Q driver in the second acousto-optic modulator, and diffraction light with the preset frequency and the preset energy is obtained and is output from the output control head; the controller is electrically connected with the first Q driver, the second Q driver and the output control head and is used for controlling the action of the corresponding devices. The matching relation between the gray value and the radio frequency output power is established by respectively controlling the frequency and the energy of the laser through the two Q drivers, so that the color difference of a light color area in the bitmap marking process is reduced.

Description

Laser bitmap marking device and laser bitmap marking method

Technical Field

The invention relates to the field of laser marking, in particular to a laser bitmap marking device and a laser bitmap marking method.

Background

The laser marking technology is one of the great application fields of the laser processing technology, is also a modern precision processing technology, and has the advantages of high efficiency, no pollution, high speed and low cost compared with the traditional processing technology, so that the laser marking technology has very wide application prospect. The laser marking technology is a new type of high precision marking technology, and its working principle is that the laser beam with high energy density controlled by computer is used to print various characters, symbols and patterns on the surface of workpiece (mechanical parts, electronic components, instruments, tools, etc.) to make permanent marks, trademarks, etc. Compared with the traditional marking modes such as chemical corrosion, mechanical carving, ink printing and the like, the laser marking technology has incomparable advantages. The laser marking technology utilizes laser as processing equipment, has the characteristics of no contact, no cutting force and small heat influence, and ensures the original characteristics of workpieces. Because of no processing force effect between the laser marking device and the workpiece, the processing material is not easy to deform and small in damage degree, and marks formed by laser marking are clear and durable and even can never be worn out, so that the laser marking device has the obvious advantage that the laser technology is different from other processing means, and the original precision of the workpiece is ensured. The processed workpiece is not substantially deformed during heat treatment, cutting and welding, and the laser marking technique is also successfully used in localized heat treatment and welding of picture tubes. In addition, the laser has relatively good control on space and time, and relatively large control on the quality, shape and size of the processing material and the degree of freedom of the processing environment. Therefore, the method is particularly suitable for the fields of automatic processing and special surface processing, and due to the flexible processing mode, the method can meet the production requirement of small batches of single parts in a laboratory and can also meet the requirement of a user on large-batch processing production.

Meanwhile, the combination of the laser processing technology and the computer control technology can be combined into high-efficiency automatic processing equipment, various characters, patterns and symbols can be identified, various identification patterns can be designed easily by utilizing software, the content of the identification can be changed, and the efficiency of modern processing production is continuously improved. Compared with a chemical corrosion method, the laser processing technology does not cause any pollution to the environment, does not emit noise compared with mechanical marking, and is a high-environment-friendly and pollution-free laser processing technology.

The structure of laser marking machine mainly includes: a control system, a laser, a scanning galvanometer system and the like. The control system is a core part of the control system of the laser marking machine and is used for finishing editing marking contents, converting the marking contents into control signals and transmitting the control signals to the galvanometer system and the laser system, and finally processing marking input contents of external equipment. Laser marking includes vector graphic marking and bitmap marking. The vector diagram marking is to control the laser parameters and the wiring speed on a continuous path. The bitmap marking is to control the power, the dwell time and the like of laser on each pixel point so as to display marks with different chromatic aberration. The general method for bitmap marking is to match the Q switch release time of an acousto-optic Q-switched laser with a gray value, and change the energy of the laser by changing the Q switch release time to realize the change of the gray value. At this time, the Q switch of the acousto-optic Q-switched laser in the laser plays two roles, one is the selection of the working frequency, and the other is the adjustment of the laser energy. The energy storage time of the laser medium can be indirectly changed by adjusting the Q switch release time to control the output energy of the laser, so that the laser energy is forced to be matched with the gray value.

Disclosure of Invention

Therefore, it is necessary to provide a laser bitmap marking device and a laser bitmap marking method capable of reducing chromatic aberration of a light color area in a bitmap marking process.

The invention provides a laser bitmap marking device which comprises a laser source, a first Q driver, a second Q driver, a first acousto-optic modulator, a second acousto-optic modulator, an output control head and a controller, wherein the first acousto-optic modulator is used for generating a first acousto-optic signal;

laser emitted by the laser source is output to the first acousto-optic modulator, the frequency of the laser is adjusted by the first Q driver in the first acousto-optic modulator, stable laser with a preset frequency is formed, the stable laser enters the second acousto-optic modulator, the energy of the stable laser is adjusted by the second Q driver in the second acousto-optic modulator, and diffracted light with the preset frequency and the preset energy is obtained and output from the output control head;

the controller is electrically connected with the first Q driver, the second Q driver and the output control head for controlling the action of the corresponding devices.

In one embodiment, the first acousto-optic modulator is coupled to the laser source to form a laser with the first acousto-optic modulator built in.

In one embodiment, the laser is a nanosecond laser.

In one embodiment, the output control head includes a base and a field lens mounted on the base, and the diffracted light having a predetermined frequency and a predetermined energy is output from the field lens.

In one embodiment, the controller comprises an industrial personal computer and a marking control card electrically connected with the industrial personal computer, a marking control program in the industrial personal computer can send a preset frequency and a preset energy instruction to the marking control card, and the marking control card controls the first Q driver according to the preset frequency and controls the second Q driver according to the preset energy.

In one embodiment, the system further comprises at least one total reflection mirror, and the diffracted light which reaches the preset frequency and the preset energy simultaneously and is output by the second acousto-optic modulator enters the output control head after passing through the total reflection mirror adjusting path.

In one embodiment, the light absorption seat is further included and is used for absorbing the diffracted light which reaches preset energy but not reaches preset frequency and is formed after being diffracted by the second acousto-optic modulator.

In one embodiment, the ultrasonic diagnosis device further comprises a beam expander, and the beam expander expands the diffracted light which is formed by diffraction of the second sound light modulator and reaches a preset frequency and preset energy simultaneously.

Furthermore, the invention also provides a laser bitmap marking method, which uses the laser bitmap marking device to carry out bitmap marking;

the laser emitted by the laser source is output to the first acousto-optic modulator, the first Q driver controls the first acousto-optic modulator to form stable laser with preset frequency by adjusting Q switch release time, then the stable laser enters the second acousto-optic modulator, the second Q driver enables the stable laser with the preset frequency entering the second acousto-optic modulator to form diffraction light with preset energy by controlling radio frequency output power of the second acousto-optic modulator, finally diffraction light reaching the preset frequency and the preset energy at the same time is obtained, and bitmap marking is carried out by using the diffraction light.

In one embodiment, the radio frequency output power of the second acousto-optic modulator is 0% -90%.

The laser bitmap marking device provided by the invention comprises a laser source, a first Q driver, a second Q driver, a first acousto-optic modulator, a second acousto-optic modulator, an output control head and a controller, wherein laser emitted by the laser source is output to the first acousto-optic modulator, the frequency is adjusted by the first Q driver in the first acousto-optic modulator to form stable laser with preset frequency, the stable laser enters the second acousto-optic modulator, the energy is adjusted by the second Q driver in the second acousto-optic modulator, and diffracted light with the preset frequency and the preset energy is obtained and output from the output control head. The frequency and the energy of the laser are respectively controlled by using the two Q drivers, and the matching relation between the gray value and the radio frequency output power is established through the correlation between the radio frequency output power and the gray value of the bitmap marking, so that the color difference of a light color area in the bitmap marking process can be reduced.

Drawings

FIG. 1 is a diagram of a laser bitmap marking device;

the reference numerals are explained below:

100: laser bitmap marking device, 101: laser, 102: second acousto-optic modulator, 103: total reflection mirror, 104: 0 order diffracted light, 105: light absorption seat, 106: beam expander, 107: output control head, 108: first Q driver, 109: marking control card, 110: industrial personal computer, 111: second Q driver, 112: protective window, 113: 1 st order diffracted laser light.

Fig. 2 is an image obtained using the laser bitmap marking apparatus of the present invention.

Fig. 3 is an image obtained using a conventional laser bitmap marking device.

Detailed Description

The present invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise. In the description of the present invention, "a plurality" means at least one, e.g., one, two, etc., unless specifically limited otherwise.

The words "preferably," "more preferably," and the like in this disclosure mean embodiments of the invention that may, in some instances, provide certain benefits. However, other embodiments may be preferred, under the same or other circumstances. Furthermore, the recitation of one or more preferred embodiments does not imply that other embodiments are not useful, nor is it intended to exclude other embodiments from the scope of the invention.

When a range of values is disclosed herein, the range is considered to be continuous and includes both the minimum and maximum values of the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values of the range is included. Further, when multiple range-describing features or characteristics are provided, the ranges may be combined. In other words, unless otherwise indicated, all ranges disclosed herein are to be understood to encompass any and all subranges subsumed therein.

It should be noted that in the description of the present invention, for the terms of orientation, there are terms such as "central", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicating the orientation and positional relationship based on the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific scope of the present invention.

In describing positional relationships, unless otherwise specified, when an element such as a layer, film or substrate is referred to as being "on" another layer, it can be directly on the other layer or intervening layers may also be present. Further, when a layer is referred to as being "under" another layer, it can be directly under, or one or more intervening layers may also be present. It will also be understood that when a layer is referred to as being "between" two layers, it can be the only layer between the two layers, or one or more intervening layers may also be present.

Where the terms "comprising," "having," and "including" are used herein, it is intended to cover a non-exclusive inclusion, as another element may be added, unless an explicit limitation is used, such as "only," "consisting of … …," etc.

Unless mentioned to the contrary, terms in the singular may include the plural and are not to be construed as being one in number.

Further, the drawings are not drawn to a 1:1 scale, and the relative sizes of the elements in the drawings are drawn only by way of example to facilitate understanding of the invention, but are not necessarily drawn to true scale, and the scale in the drawings does not constitute a limitation of the invention. It will be understood that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The invention provides a laser bitmap marking device 100 which comprises a laser source, a first Q driver 108, a second Q driver 111, a first acousto-optic modulator, a second acousto-optic modulator 102, an output control head 107 and a controller.

Laser emitted by the laser source is output to the first acousto-optic modulator, the frequency of the laser is adjusted by the first Q driver 108 in the first acousto-optic modulator, stable laser with preset frequency is formed, the stable laser enters the second acousto-optic modulator 102, the energy of the stable laser is adjusted by the second Q driver 111 in the second acousto-optic modulator 102, and diffracted light with the preset frequency and the preset energy is obtained and output from the output control head 107;

the controller is electrically connected with the first Q driver 108, the second Q driver 111, and the output control head 107 for controlling the actions of the respective devices.

Specifically, the steady-state laser light with the preset frequency enters the second acousto-optic modulator 102, and forms 0-order diffracted light and 1-order diffracted light respectively through diffraction, wherein the diffraction angle of the 1-order diffracted light is not changed, and the energy of the diffracted light is controlled through the second Q driver 111, so that the 1-order diffracted light reaching the preset frequency and the preset energy simultaneously is finally obtained.

In a specific example, the first acousto-optic modulator is coupled to a laser source to form a laser 101 with the first acousto-optic modulator built in.

Preferably, the laser 101 is a nanosecond laser.

It can be understood that the controller in the laser bitmap marking device 100 includes an industrial personal computer 110 and a marking control card 109, a marking control program in the industrial personal computer 110 can send a preset frequency and preset energy command to the marking control card 109 as required, and the marking control card 109 controls the first Q driver 108 and the second Q driver 111 according to the preset frequency and the preset energy.

In one specific example, the output control head 107 includes a base and a field lens mounted on the base, and diffracted light having a preset frequency and a preset energy is output from the field lens.

Further, the laser bitmap marking device 100 further includes a total reflection mirror 103, the number of the total reflection mirrors 103 is at least one, and the diffracted light which reaches the preset frequency and the preset energy while being output by the second acoustic light modulator 102 enters the output control head after passing through the path of the total reflection mirror 103. It can be understood that the number of the total reflection mirror 103 can be set according to actual needs.

Furthermore, the laser bitmap marking device 100 also includes an absorption seat 105, the absorption seat 105 absorbs the diffracted light which reaches the preset energy and does not reach the preset frequency and is formed after being diffracted by the second acousto-optic modulator 102, and specifically, the 0 th order diffracted light 004 is absorbed by the absorption seat 105 after being reflected by the holophote 103.

In a specific example, a beam expander 106 is further included, and the beam expander 106 expands the diffracted light reaching the preset frequency and the preset energy simultaneously and formed after being diffracted by the second acousto-optic modulator 102. Specifically, the 1 st order diffracted light reflected by the half mirror 103 enters the beam expander 106 for beam expansion and finally enters the output control head 107, so as to form the diffracted light 1 st order diffracted laser 113 with the required preset frequency and preset energy.

It can be understood that, in the laser bitmap marking device 100 provided by the present invention, the first acousto-optic modulator is connected to the first Q driver 108 through a radio frequency line, and the second acousto-optic modulator 102 is connected to the second Q driver 111 through a radio frequency line, so that the first Q driver 108 and the second Q driver 111 effectively control the frequency and the power of the first acousto-optic modulator and the second acousto-optic modulator 102, respectively.

The invention also provides a laser bitmap marking method, which comprises the steps of carrying out bitmap marking by using the laser bitmap marking device 100, outputting laser provided by the laser source 101 to the first acousto-optic modulator, controlling the first acousto-optic modulator by the first Q driver 108 to form stable laser with preset frequency by adjusting the release time of the Q switch, then entering the second acousto-optic modulator 102, controlling the radio frequency output power of the second acousto-optic modulator 102 by the second Q driver 111 to enable the stable laser with the preset frequency entering the second acousto-optic modulator 102 to form diffraction light with preset energy, finally obtaining diffraction light reaching the preset frequency and the preset energy simultaneously, and carrying out bitmap marking by using the diffraction light.

In one particular example, the radio frequency output power of the second acousto-optic modulator 102 is 0% -90%.

It is understood that the radio frequency output power of the second acoustic light modulator 102 may be, but is not limited to, 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, or 90%.

According to the laser bitmap marking method, the laser bitmap marking device 100 is used for respectively controlling the frequency and the energy of laser, the matching relation between the gray value and the radio frequency output power is established through the correlation between the radio frequency output power and the gray value of bitmap marking, and the color difference of a light color area in the bitmap marking process can be reduced.

The laser bitmap marking method comprises the following specific steps: marking software in the industrial personal computer 110 sends a preset frequency and preset energy instruction to the marking control card 109 as required, and the marking control card 109 controls the first Q driver 108 according to the preset frequency and controls the second Q driver 111 according to the preset energy;

the laser light provided by the laser source 101 is output to the first acousto-optic modulator, the first Q driver 108 controls the first acousto-optic modulator to form stable laser light with preset frequency by adjusting the release time of the Q switch, then the stable laser light with preset frequency enters the second acousto-optic modulator 102, the second Q driver 111 controls the radio frequency output power of the second acousto-optic modulator 102 to make the stable laser light with preset frequency entering the second acousto-optic modulator 102 form diffraction light with preset energy, the diffraction light forms 0 order diffraction light and 1 order diffraction light respectively, wherein the diffraction angle of the 1 st order diffraction light is not changed, for the 0 th order diffraction light, after being reflected by the holophote 103, the 0 th order diffraction light is absorbed by the light absorption seat 105, the 1 st order diffracted light reflected by the holophote 103 for the 1 st order diffracted light enters the beam expander 106 for beam expansion and finally enters the output control head 107, and the 1 st order diffracted light 113 reaching the preset frequency and the preset energy simultaneously is obtained. Further, the protection window 112 is used for projecting laser, sealing the devices of the second acousto-optic modulator 102, the total reflection mirror 103 and the light absorption seat 105, controlling the humidity level in the cavity, preventing dust from depositing on the surface of the device to cause laser damage, and improving the working stability of the device.

The laser bitmap marking device 100 is used by matching the laser 101 with the second sound optical modulator 102 and the second Q driver 111, so that the frequency control and the energy control of the laser 101 on the laser are separated, the processing speed and the energy control are not influenced mutually, the laser energy is accurately corresponding to the bitmap gray level, the problem of abnormal color difference existing in a light color area during laser marking, particularly bitmap marking, is solved, and the gray level value of the light color area is in smooth transition.

Fig. 2 is an image obtained by using the laser bitmap marking device of the present invention, and it can be seen that the image uniformity of the image obtained by the laser bitmap marking device of the present invention in the light color region is good. Fig. 3 is an image obtained by using a conventional laser bitmap marking device, and the image has obvious chromatic aberration in a selected area, that is, obvious unevenness in a light color area. Further, the laser marking device provided by the invention is applied to the bitmap marking process, the frequency and the energy of laser are respectively controlled by using the two Q drivers, the matching relation of the gray value and the radio frequency output power is successfully established, the color difference of a light color area in the bitmap marking process can be reduced, the problem of abnormal color difference existing in the light color area is solved, and the gray value of the light color area is in smooth transition.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, so as to understand the technical solutions of the present invention specifically and in detail, but not to be understood as the limitation of the protection scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. It should be understood that the technical solutions provided by the present invention and obtained by logical analysis, reasoning or limited experiments by those skilled in the art are all within the scope of the appended claims. Therefore, the protection scope of the patent of the present invention shall be subject to the content of the appended claims, and the description and the attached drawings can be used for explaining the content of the claims.

Claims

1. A laser bitmap marking device is characterized by comprising a laser source, a first Q driver, a second Q driver, a first acousto-optic modulator, a second acousto-optic modulator, an output control head and a controller;

2. The laser bitmap marking device of claim 1, wherein the first acousto-optic modulator is coupled with the laser source to form a laser having the first acousto-optic modulator built into it.

3. The laser bitmap marking device of claim 2, wherein the laser is a nanosecond laser.

4. The laser bitmap marking device according to claim 1, wherein the output control head includes a base body and a field lens mounted on the base body, the diffracted light having a preset frequency and a preset energy being output from the field lens.

5. The laser bitmap marking device as claimed in claim 1, wherein the controller comprises an industrial personal computer and a marking control card electrically connected with the industrial personal computer, a marking control program in the industrial personal computer can send a preset frequency and preset energy instruction to the marking control card, and the marking control card controls the first Q driver according to the preset frequency and controls the second Q driver according to the preset energy.

6. The laser bitmap marking device according to any one of claims 1 to 5, further comprising at least one total reflection mirror, wherein the diffracted light which reaches a preset frequency and a preset energy simultaneously and is output by the second acoustic optical modulator passes through a path adjusted by the total reflection mirror and enters the output control head.

7. The laser bitmap marking device according to any one of claims 1 to 5, further comprising a light absorption seat for absorbing the diffracted light which reaches a preset energy but not a preset frequency and is formed after being diffracted by the second acousto-optic modulator.

8. The laser bitmap marking device according to any one of claims 1 to 5, further comprising a beam expander, wherein the beam expander expands the diffracted light which is formed by diffraction of the second acousto-optic modulator and reaches a preset frequency and a preset energy at the same time.

9. A laser bitmap marking method is characterized in that a laser bitmap marking device according to any one of claims 1 to 8 is used for bitmap marking;

10. The laser bitmap marking method of claim 9, wherein the radio frequency output power of the second acousto-optic modulator is 0% to 90%.