Workpiece processing apparatus using workpiece having reference marks, workpiece processing method, and computer storage medium

1. A workpiece processing apparatus comprising:

a workpiece table configured to receive a workpiece thereon;

a plurality of carriage units, each carriage unit including a carriage plate, a carriage, and a droplet ejecting head arranged on a lower side of the carriage, each droplet ejecting head being configured to perform a predetermined processing on the workpiece placed on the workpiece table;

a linear motor configured to move the workpiece table in a scanning direction relative to the droplet ejecting head;

a linear scale configured to measure a position of the workpiece table in the scanning direction by outputting a pulse signal corresponding to a position of the linear motor;

a pair of sub-scanning direction guide rails configured to move the plurality of carriage units in a sub-scanning direction orthogonal to the scanning direction;

a detector including a camera mounted on each carriage plate, each camera being positioned adjacent each droplet ejecting head and positioned in a line with each droplet ejecting head along the scanning direction, the detector configured to detect a position of the workpiece placed on the workpiece table by detecting reference marks formed on the workpiece; and

a controller configured to calculate a positional correction amount of the workpiece table based on the pulse signal and a detection result of the detector using a correction table, convert the pulse signal, and output a converted pulse signal to the linear motor and an inkjet controller configured to control a droplet ejection timing of each droplet ejecting head,

wherein the detector detects the position of the workpiece before a first droplet ejecting head processes the workpiece, and

the controller is further configured to renew the correction table used for the calculation of the positional correction amount of the workpiece table while the workpiece table is moved by the linear motor.

2. The workpiece processing apparatus of claim 1 , wherein the predetermined processing is drawing a pattern by ejecting droplets of a functional liquid onto the workpiece.

3. A workpiece processing method comprising:

providing a workpiece processing apparatus comprising: a plurality of carriage units, each carriage unit including a carriage plate, a carriage, and a droplet ejecting head arranged on a lower side of the carriage, each droplet ejecting head configured to perform a predetermined processing on a workpiece placed on a workpiece table, each carriage unit being mounted on a pair of sub-scanning direction guide rails configured to move the plurality of carriage units in a sub-scanning direction orthogonal to a scanning direction,

a linear motor configured to move the workpiece table in the scanning direction relative to the droplet ejecting head,

a linear scale configured to measure a position of the workpiece table in the scanning direction by outputting a pulse signal corresponding to a position of the linear motor;

a detector including a camera mounted on each carriage plate, each camera being positioned adjacent each droplet ejecting head and positioned in a line with each droplet ejecting head along the scanning direction, the detector configured to detect a position of the workpiece placed on the workpiece table by detecting reference marks formed on the workpiece; and

a controller configured to calculate a positional correction amount of the workpiece table based on the pulse signal and a detection result of the detector using a correction table, convert the pulse signal, and output a converted pulse signal to the linear motor and an inkjet controller configured to control a droplet ejection ejection timing of the each droplet ejecting head,

wherein the detector detects the position of the workpiece before a first droplet ejecting head processes the workpiece, and

the controller is further configured to renew the correction table used for the calculation of the positional correction amount of the workpiece table while the workpiece table is moved by the linear motor;

measuring, with the linear scale, the position of the workpiece table while moving the workpiece table relative to the first droplet ejecting head by the linear motor in the scanning direction orthogonal to the sub-scanning direction by outputting the pulse signal corresponding to the position of the linear motor;

detecting, with the detector including the camera mounted on each carriage plate, each camera being positioned adjacent each droplet ejecting head and positioned in the line with each droplet ejecting head along the scanning direction, the position of the workpiece placed on the workpiece table by detecting the reference marks formed on the workpiece while moving the workpiece table relative to the first droplet ejecting head by the linear motor in the scanning direction;

calculating the positional correction amount of the workpiece table based on the pulse signal and the detection result of the detector using the correction table, converting the pulse signal, and outputting the converted pulse signal to the linear motor and the inkjet controller configured to control the droplet ejection timing of the droplet ejecting head, and

renewing the correction table used for the calculating of the positional correction amount of the workpiece table while the workpiece table is moved by the linear motor, wherein the detecting is performed before the first droplet ejecting head processes the workpiece.

4. The workpiece processing method of claim 3 , wherein the predetermined processing is drawing a pattern by ejecting droplets of a functional liquid onto the workpiece.

5. The workpiece processing apparatus of claim 1 , wherein the position of the workpiece detected by the detector includes a position in a Y-axis direction, a position in an X-axis direction, and a position in a θ direction.