ELECTROMAGNETIC RESONANT VIBRATOR An apparatus (58) for effecting a vibrating motion comprises a resonant planar armature (2), a housing, an electromagnetic device attached to the housing for effecting an alternating electromagnetic field, a magnetic device coupled to the armature (2) and to the electromagnetic field for alternatively moving the armature (2) in a first and a second direction in response to the electromagnetic field. The resonant planar armature (2) comprises a plurality of planar spring members (50, 52, 52, and 56) arranged regularly about a central planar region within a planar perimeter region of the armature (2), and the spring members provide a restoring force normal to a movement of the central region of the armature (2) caused by the alternating electromagnetic field.