| 摘要 |
PURPOSE:To prevent the movement of each component part or deformation of a circuit board from being caused by an injection pressure in injection molding, by covering a bottom part of a radiator with a closing bottom plate, and providing a positioning part at that part to thereby position and support the circuit board and a coil body. CONSTITUTION:A wire dot printer head comprises a radiator 21, a coil body 22, a circuit board 23 and a resin member 24. The coil body 22 comprises an annular core 42 having a plurality of core pins 41 arranged in an annular pattern, and a plurality of coils 43 adhered to the periphery of each of the core pins 41, each of the coils 43 being connected to a circuit provided on the circuit board 23. The circuit board 23 is provided with positioning holes 46 at positions corresponding to positioning pins 36 to form parts 47 to be positioned. The coil body 22 is positioned by positioning parts 37 and the parts 47 to be positioned, and is thereby supported, so that the circuit board 23 is prevented from being deformed by an ejection pressure. |
