| 摘要 |
PROBLEM TO BE SOLVED: To obtain an electronic circuit unit which can prevent the occurrence of short circuits among a variety of wiring patterns due to floating solder separated from connection solder. SOLUTION: Since a conductor pattern 11 for sticking floating solder is provided on the lower surface 1a of the circuit board 1 of an electronic circuit unit in a state such that the end face of the pattern 11 is exposed on the side face 1c of the circuit board 1 and, at the same time, the pattern 11 is adjoined or connected to lower surface electrodes 2, floating solder separated from connection solder adheres to the pattern 11 and, even when the electronic circuit unit is used for a portable telephone set, etc., the floating solder does not come off a mother board and no short circuit occurs among wiring patterns due to the floating solder when weak vibrations or shocks are applied to the portable telephone set, etc.
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