The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 04, 1989
Filed:
Dec. 31, 1986
Dietrich E Riemer, Auburn, WA (US);
The Boeing Company, Seattle, WA (US);
Abstract
A screen printing method and apparatus in which the ink pressure is held constant by varying the squeegee speed and/or the squeegee angle during a print stroke. In one method, the squeegee velocity v and/or squeegee angle .alpha. are controlled such that v times the square root of the amount of ink A on the screen before the squeegee, divided by the square of the sine of .alpha., is substantially constant. In another approach, the pressure is directly measured and held constant during the print stroke. The quantity A may be determined as a linear function of the squeegee position during the print stroke. A screen printing apparatus is provided having a squeegee with a planar surface and a contact edge at the lower edge of the planar surface. The squeegee is mounted such that it can be rotated about the contact edge, to thereby vary the squeegee angle without changing the elevation of the contact edge.