阅读说明：本技术 一种激光成像设备 (Laser imaging equipment ) 是由 陈乃奇 陈钢 于 2021-08-24 设计创作，主要内容包括：本发明实施例提供了一种激光成像设备,用于提高激光成像的精度。激光成像设备包括：包括：上位机、可编程逻辑器件、扫描组件以及两组线性位置编码器；其中,扫描组件上设置有沿直线分布的一列激光器,且该列激光器在水平方向和竖直方向可移动；线性位置编码器安装在扫描组件上,用于在激光成像过程中检测一列激光器所在目标直线上的两个标定点的位置；上位机与可编程逻辑器件电连接,上位机用于向可编程逻辑器件传输激光曝光点位置信息；可编程逻辑器件通过数据读取装置周期性获取目标直线上的两个标定点的位置,并根据两个标定点的位置计算每个激光器的实时位置,并根据每个激光器的实时位置生成控制激光器开关的控制信号。(The embodiment of the invention provides laser imaging equipment, which is used for improving the precision of laser imaging. The laser image forming apparatus includes: the method comprises the following steps: the device comprises an upper computer, a programmable logic device, a scanning assembly and two groups of linear position encoders; the scanning assembly is provided with a row of lasers distributed along a straight line, and the row of lasers can move in the horizontal direction and the vertical direction; the linear position encoder is arranged on the scanning assembly and used for detecting the positions of two calibration points on a target straight line where a row of lasers are located in the laser imaging process; the upper computer is electrically connected with the programmable logic device and is used for transmitting the position information of the laser exposure point to the programmable logic device; the programmable logic device periodically acquires the positions of two calibration points on a target straight line through the data reading device, calculates the real-time position of each laser according to the positions of the two calibration points, and generates a control signal for controlling the on-off of each laser according to the real-time position of each laser.)

1. A laser imaging apparatus, comprising: the device comprises an upper computer, a programmable logic device, a scanning assembly and two groups of linear position encoders; wherein the content of the first and second substances,

a row of lasers distributed along a straight line are arranged on the scanning assembly, and the row of lasers can move in the horizontal direction and the vertical direction;

the linear position encoder is arranged on the scanning assembly and used for detecting the positions of two calibration points on a target straight line where the line of lasers are located in the laser imaging process;

the upper computer is electrically connected with the programmable logic device and is used for transmitting the position information of the laser exposure point to the programmable logic device;

the programmable logic device is respectively and electrically connected with a driver of the laser and the data reading devices of the two groups of linear position encoders; the programmable logic device periodically acquires the positions of two calibration points on the target straight line through the data reading device, calculates the real-time position of each laser according to the positions of the two calibration points, and generates a control signal for controlling the switch of each laser according to the real-time position of each laser.

2. The laser imaging apparatus of claim 1, wherein the calculating the real-time position of each laser from the positions of the two index points comprises:

calculating the slope of the target straight line according to the two calibration points on the target straight line;

and respectively calculating the real-time position of each laser according to the slope of the target straight line and the distance between each laser and the calibration point.

3. Laser imaging apparatus according to claim 1,

the scanning assembly is provided with a horizontal guide rail, a horizontal moving platform and a vertical moving platform; the horizontal moving platform is arranged on the horizontal guide rail and can move along the horizontal guide rail, and a vertical guide rail is arranged on the horizontal moving platform; the vertical moving platform is arranged on the vertical guide rail and can move along the vertical guide rail, and a plurality of lasers distributed along a straight line are arranged on the vertical moving platform.

4. The laser imaging apparatus of claim 3, wherein the linear position encoder is: linear grating ruler or magnetic grating sensor.

5. The laser imaging apparatus of claim 3, wherein the scanning assembly is provided with at least two horizontal rails.

6. The laser imaging apparatus of claim 3, wherein the vertical moving platform is provided with at least two vertical guide rails.

7. The laser imaging device as claimed in claim 3, further comprising a horizontal synchronous belt and a synchronous pulley, wherein the synchronous pulleys are respectively installed at two sides of the scanning assembly, and the synchronous belt is used for driving the horizontal moving platform to move on the horizontal guide rail.

8. The laser imaging apparatus of claim 7, further comprising a stepper motor for driving the timing pulley.

9. The laser imaging apparatus of any of claims 1 to 8, further comprising a gantry on which the scanning assembly is fixedly mounted.

Technical Field

The invention relates to the technical field of data processing, in particular to laser imaging equipment.

Background

The principle of the laser imaging technology is as follows: and controlling the laser to irradiate the photosensitive coating on the exposure surface for exposure, and developing the exposed photosensitive coating to generate a preset image. Compared with the traditional process, the laser imaging technology reduces the process complexity, saves the production cost, and is widely applied to the fields of screen printing plate making, PCB pattern transfer and the like.

In the related art, in the laser imaging process, a laser in a line needs to be controlled to scan line by line along the horizontal direction, and when the scanning reaches the preset exposure point position of each line, the laser is controlled to irradiate a photosensitive coating on an exposure surface for exposure. In the related art, a straight line where the laser is located in an initial state is perpendicular to a horizontal direction, and during scanning of the laser in the horizontal direction, position coordinates of a single laser are measured, and then the measured horizontal coordinates of the single laser are taken as horizontal coordinates of all the lasers.

The applicant notices that although the straight line where the laser is located is perpendicular to the horizontal direction in the initial state, in the laser imaging process, due to mechanical motion errors and mechanical vibration, an included angle (which may dynamically change) often exists between the straight line where the laser is located on a line and the horizontal coordinate direction, if the horizontal coordinate of a single laser is taken as the horizontal coordinate of all lasers, the actual position and the measured position of the laser may be deviated, so that the exposure time of the laser is deviated, and laser imaging precision loss is caused.

Disclosure of Invention

The embodiment of the invention provides laser imaging equipment, which is used for solving the problem that the actual position and the measured position have deviation in the laser imaging process.

An embodiment of the present invention provides a laser imaging apparatus, which may include:

the device comprises an upper computer, a programmable logic device, a scanning assembly and two groups of linear position encoders; wherein the content of the first and second substances,

a row of lasers distributed along a straight line are arranged on the scanning assembly, and the lasers can move in the horizontal direction and the vertical direction;

the linear position encoder is arranged on the scanning assembly and used for detecting the positions of two calibration points on a target straight line where the laser is positioned in the laser imaging process;

the upper computer is electrically connected with the programmable logic device and is used for transmitting the position information of the laser exposure point to the programmable logic device;

the programmable logic device is respectively and electrically connected with a driver of the laser and the data reading devices of the two groups of linear position encoders; the programmable logic device periodically acquires the positions of the two calibration points on the target straight line through the data reading device, calculates the real-time position of each laser according to the positions of the two calibration points, and generates a control signal for controlling the on-off of each laser according to the real-time position of each laser.

Optionally, as a possible implementation manner, in an embodiment of the present invention, the calculating the real-time position of each laser according to the positions of the two calibration points includes:

calculating the slope of the target straight line according to the two calibration points on the target straight line;

and respectively calculating the real-time position of each laser according to the slope of the target straight line and the distance between each laser and the calibration point.

Optionally, as a possible implementation manner, in the embodiment of the present invention,

the scanning assembly is provided with a horizontal guide rail, a horizontal moving platform and a vertical moving platform; the horizontal moving platform is arranged on the horizontal guide rail and can move along the horizontal guide rail, and a vertical guide rail is arranged on the horizontal moving platform; the vertical moving platform is arranged on the vertical guide rail and can move along the vertical guide rail, and a plurality of lasers distributed along a straight line are arranged on the vertical moving platform.

Optionally, as a possible implementation manner, in an embodiment of the present invention, the linear position encoder is: linear grating ruler or magnetic grating sensor.

Optionally, as a possible implementation manner, in an embodiment of the present invention, at least two horizontal guide rails are disposed on the scanning assembly.

Optionally, as a possible implementation manner, in an embodiment of the present invention, at least two vertical guide rails are disposed on the vertical moving platform.

Optionally, as a possible implementation manner, the laser imaging apparatus in the embodiment of the present invention may further include: horizontal hold-in range and synchronous pulley, synchronous pulley installs respectively the scanning subassembly both sides, the hold-in range is used for driving horizontal migration platform is in the horizontal guide rail is last to be removed.

Optionally, as a possible implementation manner, the laser imaging apparatus in the embodiment of the present invention may further include: and the stepping motor is used for driving the synchronous belt wheel.

Optionally, as a possible implementation manner, the laser imaging apparatus in the embodiment of the present invention may further include: the scanning assembly is fixedly arranged on the rack.

According to the technical scheme, the embodiment of the invention has the following advantages:

in the embodiment of the invention, the positions of two calibration points on a straight line where lasers are located are periodically obtained based on two groups of linear position encoders, the positions of the two collected calibration points are quickly calculated in real time by adopting a programmable logic device to obtain the real-time position of each laser, and the on-off state of the lasers is controlled based on the real-time positions to carry out laser imaging. Compared with the related art, when the laser carrier is inclined for one time or multiple times, the laser imaging device in the embodiment of the invention can accurately calculate the real-time position of the laser based on the positions of the two calibration points, can avoid the deviation between the actual position and the measurement position caused by a single calibration point, and improves the precision of laser imaging.

Drawings

Fig. 1 is a schematic diagram of an embodiment of a laser imaging apparatus provided in an embodiment of the present invention;

fig. 2 is a schematic view of a laser carrier tilt scene in a laser imaging apparatus according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of an embodiment of a scanning assembly in a laser imaging apparatus according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of another embodiment of a scanning assembly in a laser imaging apparatus according to an embodiment of the present invention;

fig. 5 is a schematic diagram of another specific application example of the scanning assembly in the laser imaging device according to the embodiment of the present invention.

Detailed Description

The embodiment of the invention provides laser imaging equipment, which is used for solving the problem that the actual position and the measured position have deviation in the laser imaging process and improving the precision of laser imaging.

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description and claims of the present invention and in the above-described drawings, the terms "center", "lateral", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing and simplifying the description, but do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.

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 one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The term "comprises" and any variations thereof is intended to cover non-exclusive inclusions. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

For ease of understanding, the following describes a specific process in an embodiment of the present invention, and with reference to fig. 1, an embodiment of a laser imaging apparatus provided in an embodiment of the present invention may include: host computer 10, programmable logic device 20, scanning component 30 and linear position encoder 40. Wherein the content of the first and second substances,

the scanning assembly 30 is provided with a row of lasers 400 movable in the horizontal and vertical directions, and preferably, the rows of lasers 400 are linearly spaced at equal intervals.

Two sets of linear position encoders 40 are mounted on the scanning assembly 30 in spaced relation to detect the position of two index points on a target line on which the laser 400 is positioned during horizontal movement of the laser 400. Alternatively, the linear position encoder may be a linear grating scale or a magnetic grating sensor. Specifically, the linear grating ruler can be composed of a ruler grating and a grating reading head; the magnetic grid sensor may be comprised of a magnetic grid ruler and a magnetic head. Preferably, the two sets of linear position encoders are disposed parallel to the horizontal moving direction of the laser 400, which means that the scale gratings of the two sets of linear grating scales are disposed parallel to the horizontal moving direction of the laser 400, or the two sets of magnetic grating scales are disposed parallel to the horizontal moving direction of the laser 400.

The upper computer 10 is electrically connected with the programmable logic device 20, and the upper computer 10 is used for transmitting the position information of the laser exposure point to the programmable logic device 20. Specifically, the upper computer 10 first performs rasterization processing on the received template image to generate a binary dot matrix image. The pixels in the binary dot matrix image are divided into two types, the first type is the pixels corresponding to the laser exposure points, and the second type is the pixels corresponding to the non-laser exposure points. One pixel point in the first type of pixel may correspond to one or more laser exposure points, which is not limited herein. After obtaining the binary dot matrix image generated by the rasterization process, the programmable logic device 20 may indirectly obtain the laser exposure point position information, or the programmable logic device 20 may directly obtain the laser exposure point position information from an upper computer, which is not limited herein. Optionally, the Programmable logic device 20 may be an fpga (field Programmable Gate array), a cpld (complex Programmable logic device), or other Programmable logic devices, and is not limited herein.

The programmable logic device 20 is electrically connected to the driver of the laser 400 and the data reading devices (the grating reading head or the magnetic head) of the two sets of linear position encoders, respectively. The programmable logic device 20 periodically obtains the positions of two calibration points on the target straight line through the data reading device, calculates the real-time position of each laser 400 according to the positions of the two calibration points, and then generates a control signal for controlling the on/off of the laser 400 according to the real-time position of each laser 400.

For example, if the state of the laser 400 moving horizontally is as shown in fig. 2, the process of calculating the real-time position of each laser 400 is as follows:

a data reading device based on two groups of linear position encoders 40 reads the coordinates of points a and B of two calibration points on a target straight line where the laser 400 is located, and then calculates the slope of the target straight line according to the coordinates of the points a and B (the specific algorithm can refer to the related technology); then, the actual position of each laser 400 is calculated by using geometric theorem according to the slope of the target straight line and the distance between each laser 400 and any calibration point. For example, the coordinate of point A is (x)₀，y₀) When a certain laser 400 is located at the upper right of the point a and the distance d is determined, the included angle between the target line and the horizontal direction can be determined to be an acute angle θ based on the slope, and the abscissa of the laser 400 is (x)₀+ d cos θ) with ordinate (y)₀+ d sin θ). It is understood that the above coordinate calculation formula is only exemplary, and when the angle between the target straight line and the horizontal direction is an obtuse angle, the coordinate calculation formula may be adjusted by referring to the geometric theory, and details are not repeated herein.

The programmable logic device 20 may calculate the real-time position of each laser 400 in each detection period, compare the real-time position with the acquired position of the laser exposure point, and control the corresponding laser to emit laser if the position of the laser exposure point matches the actual position of a current laser 400, and turn off the unmatched laser 400.

For ease of understanding, the operation of the laser image forming apparatus provided in the embodiment of the present invention will now be described. First, the upper computer 10 performs rasterization processing on the received template image to generate a binary dot matrix image, and may convert the binary dot matrix image into corresponding laser exposure point position information and transmit the laser exposure point position information to the programmable logic device 20, or directly transmit the binary dot matrix image to the programmable logic device 20 (convert the binary dot matrix image into the laser exposure point position information by the programmable logic device). The programmable logic device 20 may periodically obtain the positions of two calibration points on the target line through the data reading device, calculate the real-time position of each laser 400 according to the positions of the two calibration points, and then generate a control signal for controlling the on/off of the laser 400 according to the real-time position of each laser 400.

As can be seen from the above disclosure, in the embodiment of the present invention, the positions of two calibration points on the straight line where the laser 400 is located are periodically obtained based on two sets of linear position encoders, and the positions of the two collected calibration points are rapidly calculated by using a programmable logic device, so as to obtain the real-time position of each laser 400. Compared with the related art, when the carrier of the laser 400 is inclined, the laser imaging device in the embodiment of the invention can accurately measure the real-time position of the laser 400, so that the deviation between the actual position and the measured position in the laser imaging process is avoided, and the precision of laser imaging is improved.

On the basis of the above-mentioned embodiments, the following describes an exemplary implementation of the scanning assembly 30 according to an embodiment of the present invention. As shown in fig. 3, the scanning assembly 30 in the above embodiment is implemented as follows: the scanning assembly 30 is provided with a horizontal guide rail 100, a horizontal moving platform 200, a vertical moving platform 300 and a laser 400; the horizontal moving platform 200 is arranged on the horizontal guide rail 100 and can move along the horizontal guide rail 100, and a vertical guide rail 201 is arranged on the horizontal moving platform 200; the vertical moving platform 300 is disposed on the vertical guide rail 201 and can move along the vertical guide rail 201, and a plurality of lasers 400 distributed along a straight line are disposed on the vertical moving platform 300. In addition, the horizontal moving platform 200 and the vertical moving platform 300 may be driven by a servo motor or a magnetic force, and are not limited herein.

It will be appreciated that the implementation of the scanning assembly 30 shown in fig. 3 described above is merely exemplary, and that in practice, the movement of the laser 400 in the horizontal and vertical directions may be achieved by other mechanical structures. For example, a robot, a screw transmission, etc. may be provided to move the laser 400 in the horizontal direction and the vertical direction, and the details are not limited herein.

Optionally, as a possible embodiment, in order to ensure the smoothness of the movement of the laser 400 in the horizontal direction, at least two horizontal guide rails 100 may be disposed on the scanning assembly 30, for example, two parallel horizontal guide rails 100 may be disposed, and the details are not limited herein.

Optionally, as a possible implementation manner, in order to ensure the smoothness of the movement of the laser 400 in the vertical direction, at least two vertical guide rails 201 are arranged on the vertical moving platform 30. For example, 4 vertical guide rails 201 may be provided, and are not limited herein.

Optionally, as shown in fig. 4, as a possible implementation manner, in order to improve the stability of the scanning motion of the laser 400, the laser imaging apparatus in the embodiment of the present invention may further include a transverse timing belt 50 and a timing pulley 60, where the timing pulley 60 is respectively installed at two sides of the scanning assembly 30, and the timing belt 50 cooperates with the timing pulley 60 to drive the horizontal moving platform 30 to move on the horizontal guide rail 100.

Optionally, as a possible implementation manner, the laser imaging apparatus in the embodiment of the present invention may further include a stepping motor for driving the synchronous pulley.

Alternatively, as shown in fig. 5, as a possible implementation manner, in order to provide a working space for a workpiece on which an exposure surface on which a photosensitive coating is disposed is located, and improve the practicability of the apparatus, the laser imaging apparatus in the embodiment of the present invention may further include a frame 70, and the scanning assembly 30 is fixedly mounted on the frame 70. Preferably, the frame structure 70 forms a hollow rectangular parallelepiped space inside, and the specific size can be reasonably set according to the requirement, which is not limited herein.

While the present invention has been described in detail with reference to the foregoing examples, all of the conventional features of the embodiments described herein may not be shown or described for the convenience of understanding. Those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.