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:
Mar. 24, 1992
Filed:
Aug. 31, 1990
Michael A Millerick, San Jose, CA (US);
Michael W Patterson, Pleasanton, CA (US);
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
An automatic laser trimming apparatus (30) for semiconductor integrated chip packages removes dambars (16) and performs deflashing and degating operations. The apparatus combines a laser machining subsystem (32, 36) with a machine vision subsystem (38, 40) to accurately locate and treat the dambars on an integrated circuit package. A defocusing lens (54) is used to attenuate the intensity of the laser beam (34) to permit a single laser to perform both the dambar removal and deflashing operations. In addition, an improved fixture (46) is provided to enhance the removal of smoke and debris from the processing station and to provide improved backlighting thereby enhancing resolution.