| 摘要 |
<p>PURPOSE:To reduce the manufacturing cost by thinning the thickness of a transformer, and reducing the manhours for its mounting work of an electronic circuit board. CONSTITUTION:A plurality of electronic components 2 and a transformer 3 are mounted on an insulating board 1, and the electronic components 2 and the transformer 3 are connected by printed wiring 4. A through hole 5 is provided between both the surface and the rear of the insulating board 1 at a part being out of the locations of the electronic components 2. The transformer 3 is composed of a magnetic core 6 having an inner part 6a to be inserted into the through hole 5, a spiral pattern coil 7 formed outside the through hole 5 on, at least, one of the sides 1a and 1b, and a wound coil 8 inserted into the circular space between the inner part 6a of the magnetic core 6 and the through hole 5.</p> |
