| 摘要 |
<p>PURPOSE:To make it possible to trace a production lot number and detail data on a production lot by a method wherein English words and numeric characters are engraved on terminal leads or a lead frame previous to separation with a laser and so on. CONSTITUTION:A molding resin container 4 is provided with a collector lead 1, a base lead 2 and an emitter lead 3. A laser engraving 7, a laser engraving 7' and a laser engraving 7'' are respectively out in English numeric characters of a width of 10mum in a depth of 50mum or thereabouts on the surfaces of the terminal leads with a laser beam in a code of '7' to the lead 1, in a code of '9' to the lead 2 and in a code of 'A' to the lead 3 as a lot number to display a production lot. Such the engravings to cut on the terminal leads using a laser are executed during a manufacturing process to be performed after a semiconductor element is sealed with a molding resin. If the laser engravings 7, 7' and 7'' are arranged in order, the lot number is displayed as '79' and the '79A' can show a 'A' lot manufactured in September, 1987, for example.</p> |
