| 摘要 |
PROBLEM TO BE SOLVED: To miniaturize a solenoid driving device and to improve the magnetic efficiency by dispensing with a conventionally necessary stator core and an end plate. SOLUTION: A coil assembly 23 is formed by integrally assembling a coil 29, a bobbin 26 made of a non-magnetic member for winding the coil, and both end parts 28a, 28b composed of ferromagnetic members integrally formed on both ends of the bobbin, and the coil assembly is accommodated being fitted in a yoke 25 integrally molded in the shape of a cup. A plunger 22 is slidably fitted in a cylindrical hollow part 23a formed on the assembly, a magnetic circuit A is formed by the yoke 25, one of the end parts 28a, the plunger 22 and the other end part 28b, and an attraction part S is formed by the other end part 28b and one end face of the plunger. The other end face 22b of the plunger is coated with a spherical projecting part 32 made of the non-magnetic member to keep a predetermined interval h with respect to a bottom part 25c of the yoke.
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