Patent ID: 7388461

Claim:
An electromagnetic apparatus comprising: an actuator body; a solenoid having a coil disposed in said actuator body and wound around a coil bobbin, a yoke joined to an end of said coil bobbin, a fixed core, a movable core for being attracted to said fixed core when said coil is energized, and a spring member interposed between said fixed core and said movable core for returning said movable core to an initial position thereof; and a moving member mounted on said movable core for displacement in unison with said movable core; said movable core having a nonmagnetic layer formed on an outer surface thereof and having a predetermined thickness; and said yoke having a tubular member and an annular flange, said tubular member surrounding an outer-circumferential surface of said movable core and extending axially, said annular flange projecting radially outwardly from said tubular member, and said tubular member having an upper tubular segment extending from said annular flange toward said fixed core and a lower tubular segment extending from said annular flange toward said moving member.