CN216595891U

CN216595891U - Control system of laser direct imaging equipment

Info

Publication number: CN216595891U
Application number: CN202123385700.1U
Authority: CN
Inventors: 陈乃奇; 胡学艳
Original assignee: Shenzhen Anteland Technology Co Ltd
Current assignee: Shenzhen Anteland Technology Co Ltd
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2022-05-24
Anticipated expiration: 2031-12-29

Abstract

The embodiment of the utility model provides a laser direct imaging equipment control system for improve laser imaging's precision. The laser direct imaging apparatus control system may include: the system comprises an image processing module, a Field Programmable Gate Array (FPGA) and a linear position encoder component; the linear position encoder assembly is arranged on the laser direct imaging equipment and used for detecting the position information of the laser array in the horizontal direction; the image processing module is electrically connected with the FPGA and used for improving the resolution of the original dot matrix image in the horizontal direction to generate a corrected image and rasterizing the corrected image to generate laser exposure point position information; the FPGA is also electrically connected with a driver of the laser and a data reading device of the linear position encoder assembly; the FPGA reads the real-time position of the laser array in real time through the data reading device, and generates a control signal for controlling the laser switch according to the real-time position of the laser array and the position information of the laser exposure point.

Description

Laser direct imaging equipment control system

Technical Field

The utility model relates to a laser direct imaging technical field especially relates to a laser direct imaging equipment control system.

Background

The laser direct imaging means controlling the laser to irradiate the photosensitive coating on the exposure surface to perform image exposure, and generating a preset image after developing. In the related art, a laser direct imaging device (for example, application number: 201310084860.3, a laser direct plate making device and method for a flat screen printing plate) comprises a laser array formed by a plurality of lasers distributed equidistantly along a straight line, and the laser array is controlled to scan an exposure surface along a laser scanning direction (X-axis direction), so that a plurality of lasers can expose a plurality of rows of pixel points on the exposure surface at one time; after one scan is completed, the laser is moved in the direction perpendicular to the scanning direction (Y-axis direction) to sequentially perform scanning exposure on the remaining exposure surfaces.

The existing laser direct imaging equipment adopts a PC upper computer to control the on-off state of a laser in the scanning exposure process in the X-axis direction. The control process is as follows: the PC upper computer receives a detection signal generated by a sensor for detecting the position of the laser, processes the detection signal and then generates a control signal. The applicant has noted that the delay caused by this control procedure can be of the order of milliseconds. Based on the consideration of improving the imaging efficiency, the moving speed of the laser in the X-axis direction can reach several meters per second (the faster the speed in the X-axis direction is, the higher the imaging efficiency is), and taking 3 meters per second (3000 micrometers per millisecond) as an example, millisecond-level delay can cause the laser exposure point to shift 3000 micrometers, which obviously exceeds the tolerance range that can be tolerated by laser imaging. Therefore, on the basis of improving the imaging efficiency, how to improve the precision of laser imaging becomes a problem to be solved urgently.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a laser direct imaging equipment control system for improve laser imaging's precision.

The embodiment of the utility model provides a first aspect provides a laser direct imaging equipment, can include:

the system comprises an image processing module, a Field Programmable Gate Array (FPGA) and a linear position encoder component; wherein the content of the first and second substances,

the linear position encoder assembly is arranged on the laser direct imaging equipment and used for detecting the position information of the laser array in the horizontal direction;

the image processing module is electrically connected with the FPGA and used for improving the resolution of an original dot matrix image in the horizontal direction to generate a corrected image and rasterizing the corrected image to generate laser exposure point position information;

the FPGA is also electrically connected with a driver of the laser and a data reading device of the linear position encoder assembly; and the FPGA reads the real-time position of the laser array in real time through the data reading device and generates a control signal for controlling the laser switch according to the real-time position of the laser array and the position information of the laser exposure point.

Optionally, as a possible implementation manner, the control system of the laser direct imaging apparatus in the embodiment of the present invention may include two sets of the linear position encoder assemblies.

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

Optionally, as a possible embodiment, the embodiment of the utility model provides a laser direct imaging device control system still includes the host computer, host computer and step motor electric connection are used for control step motor drive the laser instrument array removes in vertical direction.

Optionally, as a possible implementation, in the embodiment of the present invention, the upper computer is electrically connected to the servo motor, and is used for controlling the servo motor to drive the laser array to move in the horizontal direction.

According to the technical solution provided by the utility model, the embodiment of the utility model has the following advantage:

the embodiment of the utility model provides an in, adopt the independent FPGA chip to handle the positional information of laser instrument array in real time, the time delay that the positional information was handled to independent FPGA chip can reach the microsecond level, has reduced the time delay that leads to because of reaching the host computer processing on the positional information of laser instrument array greatly, and then has reduced the imaging error that laser imaging in-process exposure time delay leads to, has improved laser imaging's precision. Secondly, the resolution of the original dot matrix image in the horizontal direction is improved through the image processing module in the embodiment of the application, so that the distance between single pixels is reduced, the image offset distance caused by pixel errors is reduced under the condition of the same number of pixel offset errors, and the precision of laser imaging is further improved.

Drawings

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

fig. 2 is a schematic diagram of another embodiment of a control system of a laser direct imaging apparatus in an embodiment of the present invention.

Detailed Description

In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. "electrical connection" is understood to mean the connection between different components in a circuit structure by means of physical lines, such as copper foils or wires of a PCB, which can transmit electrical signals.

For the convenience of understanding, the laser direct imaging apparatus in the embodiments of the present application is briefly described, and the laser direct imaging apparatus includes a laser array movable in a horizontal direction and a vertical direction, and a specific mechanical structure for implementing the movement of the laser array is not limited herein. For example, a mechanical arm, a screw transmission and the like can be arranged to realize the movement of the laser array in the horizontal direction and the vertical direction. For example, in the laser direct imaging device, a horizontal guide rail, a horizontal moving platform and a vertical moving platform may be provided, the horizontal moving platform is disposed on the horizontal guide rail and can move along the horizontal guide rail under the driving of a servo motor, the horizontal moving platform is provided with a vertical guide rail, the vertical moving platform is disposed on the vertical guide rail and can move along the vertical guide rail under the driving of a stepping motor, and the vertical moving platform is provided with a plurality of one-column lasers distributed along a straight line.

For easy understanding, the following describes the specific components of the control system of the laser direct imaging device in the embodiment of the present invention, please refer to fig. 1, the control system of the laser direct imaging device in the embodiment of the present invention may include: an image processing module 10, an FPGA (field programmable gate array) 20, and a linear position encoder assembly 30. Wherein the content of the first and second substances,

the linear position encoder assembly 30 is installed on the laser direct imaging device, and is configured to detect position information of the laser array in the horizontal direction, and a specific installation position of the linear position encoder assembly may be reasonably set according to a moving track of the laser array in the horizontal direction, which is not limited herein.

Optionally, the linear position encoder assembly in the embodiment of the present application may be a linear grating ruler or a magnetic grating sensor. Specifically, the linear grating scale may be composed of a scale grating and a grating reading head (data reading device); the magnetic grid sensor may be composed of a magnetic grid ruler and a magnetic head (data reading device). Preferably, the linear position encoder is arranged parallel to the horizontal direction of movement of the laser array.

Optionally, in consideration of the possibility of inclination of the laser array in the movement process, two sets of linear position encoder assemblies may be provided in the embodiment of the present application, the positions of two points of the laser array are measured simultaneously, and the inclination of the laser array is accurately calculated based on the positions of the two points.

The image processing module 10 is electrically connected with the FPGA 20, and the image processing module 10 is configured to increase a resolution of the original dot matrix image in a horizontal direction to generate a corrected image, and rasterize the corrected image to generate laser exposure point position information. The original dot matrix image is an image which is actually required to be transferred to an exposure surface through laser imaging. It should be noted that the manner of improving the resolution of the original dot matrix image in the horizontal direction may be an image interpolation algorithm in the prior art, and the image rasterization (rasterization) algorithm may also refer to an algorithm in the prior art, which is not described herein any more. Optionally, the image Processing module may be implemented in the form of a Central Processing Unit (CPU) with a computing function, a microprocessor, or other data Processing chips (e.g., FPGA, etc.) running corresponding software.

The FPGA 20 is electrically connected with a driver of the laser and a data reading device of the linear position encoder assembly, so that the real-time position of the laser array is read in real time through the data reading device, and a control signal for controlling the laser switch is generated according to the real-time position of the laser array and the position information of the laser exposure point. Specifically, when the real-time position of the laser array reaches the preset laser exposure point position, the corresponding laser is controlled to be turned on to expose the point on the exposure surface.

According to the above disclosure, in the embodiment of the application, the independent FPGA chip is adopted to process the position information of the laser array in real time, and the time delay of the independent FPGA chip for processing the position information can reach microsecond level, so that the time delay caused by the fact that the position information of the laser array is uploaded to an upper computer for processing is greatly reduced, the imaging error caused by the time delay in the laser imaging process is further reduced, and the precision of laser imaging is improved. Secondly, the resolution of the original dot matrix image in the horizontal direction is improved through the image processing module in the embodiment of the application, so that the distance between single pixels is reduced, the image offset distance caused by pixel errors is reduced under the condition of the same number of pixel errors, and the precision of laser imaging is further improved.

On the basis of the embodiment shown in fig. 1, please refer to fig. 2, the control system of the laser direct imaging apparatus in the embodiment of the present invention may further include an upper computer 40, the upper computer 40 is electrically connected to a stepping motor 501 in the laser direct imaging apparatus 50, and the stepping motor 501 is controlled to drive the laser array to move in the vertical direction. Optionally, the upper computer 40 may further be electrically connected to the servo motor 502, and the laser array is driven to move in the horizontal direction by controlling the servo motor 502. The embodiment of the application separates the motion control and the laser exposure control in the laser direct imaging equipment, the motion control is realized by the upper computer, the laser exposure control is realized by the FPGA chip, the exposure delay caused by unified control can be avoided, and the precision of laser imaging is improved.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. A control system of a laser direct imaging device is characterized by being applied to the laser direct imaging device, wherein the laser direct imaging device comprises a laser array which can move in the horizontal direction and the vertical direction; the laser direct imaging device control system includes: the system comprises an image processing module, a Field Programmable Gate Array (FPGA) and a linear position encoder component; wherein, the first and the second end of the pipe are connected with each other,

2. The laser direct imaging device control system of claim 1, comprising two sets of the linear position encoder assemblies.

3. The laser direct imaging apparatus control system of claim 1 or 2, wherein the linear position encoder assembly is: linear grating ruler or magnetic grating sensor.

4. The control system of claim 3, further comprising an upper computer electrically connected to the stepping motor for controlling the stepping motor to drive the laser array to move in a vertical direction.

5. The control system of claim 4, wherein the upper computer is electrically connected to the servo motor for controlling the servo motor to drive the laser array to move in a horizontal direction.