| 摘要 |
PROBLEM TO BE SOLVED: To identify a polarity when a part is mounted, by making land configuration of at least one place different from that of other lands on the same part. SOLUTION: A land 1-1 is shaped to a pentagon to be differentiated from a rectangle of other lands 1-2. Thereby, when an electronic part 1-3 with a polarity is mounted on lands 1-1, 1-2, it is possible to tell whether it should be mounted on a position such as a first terminal 1-5, etc. Furthermore, even after mounted, it is possible to tell whether or not it is mounted with a right polarity from the land 1-1 and a polarity mark 1-4 of an electronic part. Therefore, an appearance inspection after mounting can be carried out only by a land configuration of a printed wiring board. Therefore, it is possible to disuse a symbol on a printed wiring board, to reduce a cost and to improve mounting efficiency. |
