Foolproof polarity indications of poled electronic parts or devices in printed circuit board

摘要

Disclosed is a foolproof polarity indication of poled electronics parts or devices to be given to a printed circuit board to assure that poled electronics parts and/or devices be correctly mounted in respect of their polarities to meet occasional requirements dependent on different specifications. Each pair of terminal holes (1a,1b) are allotted to a given poled electronics part or device. Two symbols (2a,2b) representative of such electronics part or device are arranged side by side on either side of the line drawn from one to the other terminal hole. The poled electronics part or device symbols are of reversed polarities. This dual symbol arrangement is effective to draw workers' attention in mounting electrode components in terms of their polarities. When extra components (S) or dummy ones are combined with such a poled component, they are encircled by a boundary line (6), thereby showing the correct polarity direction of the poled component in respect of whether it is enclosed or not.