Patent Number: 7,820,917

Title: Circuit board

Abstract: A circuit board includes a plurality of through holes into which a plurality of leads of one electronic devices are inserted and soldered with lead free solder. Among these through holes, the volume of through hole into which the outermost end lead of leads of the electronic device is inserted, is set greater than the volume of through hole, into which the lead at the position nearest to the center of the electronic device is inserted.

Inventors: Kanetaka; Yoshifumi (Tokyo, JP), Ishizuka; Naomi (Tokyo, JP)

Assignee: NEC Corporation

International Classification: H05K 1/16 (20060101)

Expiration Date: 2018-10-26 0:00:00