Method and apparatus for indelibly marking articles during a manufacturing process

摘要

An indelible mark (26) is produced on an article of manufacture (17) for indicating a defective article. In the preferred embodiment a bonded lead frame assembly (17) which has a lead frame site (14, 15) with a semiconductor die (18) and cracked ceramic substrate (20) bonded thereto is indelibly marked by causing a spark to occur from an electrode (25) to the bonded lead frame assembly (17) in the vicinity of the lead frame site (14, 15) having a cracked substrate (20).