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:
Aug. 09, 1994
Filed:
Jul. 28, 1992
Gregory R Baxter, Orange, CA (US);
Jeffrey Tesone, Rialto, CA (US);
Glenn Rivard, Pasadena, CA (US);
Optical Radiation Corporation, Azusa, CA (US);
Abstract
A double-sided exposure apparatus with an optical registration system accurately aligns and prints a circuit pattern on both sides of a workpiece, such as a circuit board. The apparatus has a computer system in which setup parameters are entered to set the desired size of the board and accuracy of alignment. A control program of the computer directs a machine vision system to inspect the workpiece and pattern, and computes precision movements of the workpiece which compensate for any sag or other variations in the glass or board that change between off-contact and soft contact. The computer system uses fiducials on the two artworks and target holes on each board to align an artwork and the board prior to exposure. At least one inspection of the fiducials, and realignment of the workpiece, is performed after the pattern is in contact with the workpiece, to thereby compensate for workpiece warpage, variations, and sag or variations of the artwork holders. Alignment uses video cameras to detect the centers of the fiducials and target using a 'best-fit' data processing method, which method includes compensation for any sag in the glass artwork holders.