Control method for laser processing machine

A control method for a laser processing machine having a laser light generator, a controller and a stage being movable for carrying a workpiece, the laser light generator configured at a fixed position relative to the stage to irradiate a laser beam onto the workpiece, the method comprising steps of:

• dividing the workpiece into multiple task blocks with each task block being equal to a scanning region of the laser beam in area, wherein multiple target points are predefined on the workpiece, and multiple target coordinates (xt, yt) of the multiple target points are stored in the controller;
• the controller driving the stage to continuously move at a constant speed to simultaneously carry the workpiece relative to the laser light generator;
• the controller continuously receiving a first movement amount of the stage along a first axis as well as a second movement amount of the stage along a second axis while the stage is continuously moving, thereby obtaining real-time coordinates T(x1t,y1t) of the workpiece at any time, wherein the first movement amount and the second movement amount are respectively measured by a first optical linear encoder and a second optical linear encoder beside the stage;
• the controller calculating laser beam landing coordinates G(x2t,y2t) according to a relationship equation by using the real-time coordinates T(x1t, y1t) of the workpiece and the multiple target coordinates R(xt, yt),
• where the relationship equation is R(xt,yt)=T(x1t,y1t)+G(x2t,y2t), wherein xt=x1t+x2t and yt=y1t+y2t;
• and
• the controller controlling the laser light generator to irradiate the laser beam onto the workpiece according to the laser beam landing coordinates G(x2t,y2t).