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:
Jan. 12, 1993
Filed:
Sep. 10, 1990
James W Rose, Delmar, NY (US);
Bradley R Karas, Amsterdam, NY (US);
Lubomry S Onyshkevych, Lawrenceville, NJ (US);
General Electric Company, Schenectady, NY (US);
Abstract
A method for the preparation a photo-mask used for photo-imaging selected areas on the surfaces of a three-dimensional printed circuit board substrate. The photo-mask comprises an opaque layer, opaque and degradation resistant to UV light, having at least one side with a contoured shape conforming to the surface irregularities on the surfaces of the three-dimensional substrate being photo-imaged. A membrane transparent and degradation resistant to UV light, having at least one side cemented to the side of the opaque layer not in contact with the surfaces of the three-dimensional substrate being photo-imaged. A pattern of grooves positioned on the opaque layer allow transmission of UV light during the photo-imaging of the surfaces of the three-dimensiional substrate. The pattern of grooves is in accordance with a conductive metal trace pattern desired on the surfaces of the three-dimensional printed circuit board substrate. The photo-mask is prepared by first forming an opaque material layer on the surfaces of the three-dimensional substrate, followed by a membrane material to form the membrane. The pattern of grooves is created by ablating the opaque layer in selected areas by means of a laser beam from a laser moved in a boustrophedonous manner.