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:
Sep. 08, 1998
Filed:
Oct. 02, 1996
Christopher P Cullen, Ipswich, MA (US);
Antonie J Engel, Bolton, MA (US);
Cognex Corporation, Natick, MA (US);
Abstract
In a machine vision system capable of capturing an optical image of a semiconductor electronic component part and digitizing the optical image, a method for locating, inspecting and placing parts known as large leaded devices, by estimating a part's location; estimating the approximate location of a group of leads; computing the center and angle of a lead scan search rectangle within which the leads in a group of leads must be located; scanning a lead scan search rectangle to locate lead edges and compile a list of edges; extracting lead positions; updating the part location estimate; and repeating these steps for each lead set to find all leads and lead centerlines; then calculating an optimal part position estimate by matching found lead positions with expected lead centerlines; and finally, inspecting the leads. A statistical lead rejection procedure is included during lead extraction.