Back to results
US 8,783,174 B2Granted
Screen printing method
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsRyo Mitta, Hiroyuki Otsuka, Ikuo Sakai, Kenji Abe, Naoki Ishikawa
Life of this patent
Estimating the term…
Abstract
The method for screen printing improves accuracy during a plurality of screen printing steps. After a first layer and an alignment mark are printed on a workpiece, the alignment mark is imaged by a camera so that the alignment mark is stored as image data in an image processing device adapted to deliver reference data for subsequent printing, and the image data is used to renew the reference data in the image processing device.
Claims9
A screen printing method which applies a plurality of screen printing steps to a workpiece to form plural layers thereon, comprising:
- printing a first layer and at least one alignment mark on a workpiece in a first screen printing step;
- imaging the at least one alignment mark printed on the workpiece using a camera;
- using an imaging processing device to compare the at least one printed alignment mark with stored alignment mark reference data to register the workpiece position for subsequent printing steps;
- storing the at least one alignment mark as alignment mark image data in the image processing device;
- renewing the stored alignment mark reference data in the image processing device by overwriting the stored alignment mark reference data with the alignment mark image data after a predetermined number of printing steps;
- and
- delivering the renewed alignment mark reference data for use in subsequent printing steps so as to improve accuracy of the printing during the plurality of screen printing steps.
4 more elements
Dependencies are inferred from the claim text.