A housing 12, a resonance drive actuator 20 having a rotor 24 having a first moment of inertia Jr and a stator 22 having a second moment of inertia Js, and a first plurality of leaf spring elements having a first spring constant krh. 60, each leaf spring element of the first plurality of leaf spring elements 60 is connected to the housing 12 and the rotor 24, and each leaf spring element of the first plurality of leaf spring elements 60 is connected to the rotor. Each leaf spring element of the second plurality of leaf spring elements 62 extends radially from 24 to the housing 12, is connected to the housing 12, engages the stator 22, and has a first spring constant krh. And the second spring constant ksh is sufficiently equal to the ratio between the first moment of inertia Jr and the second moment of inertia Js, and as a result the torque transmitted to the housing 12 during operation. A personal care device that is designed to be almost free.筐体１２と、第１の慣性モーメントＪｒを持つロータ２４及び第２の慣性モーメントＪｓを持つステータ２２を持つ共振駆動アクチュエータ２０と、第１のばね定数ｋｒｈを持つ第１の複数の板ばね要素６０と、を有し、第１の複数の板ばね要素６０の各板ばね要素は、筐体１２及びロータ２４に接続され、第１の複数の板ばね要素６０の各板ばね要素が、ロータ２４から筐体１２へと径方向に延在し、第２の複数の板ばね要素６２の各板ばね要素は、筐体１２に接続され、ステータ２２と係合し、第１のばね定数ｋｒｈと第２のばね定数ｋｓｈとの比は、第１の慣性モーメントＪｒと第２の慣性モーメントＪｓとの比と十分に同等であり、その結果として動作の間に筐体１２に伝達されるトルクがほぼ無いようにされた、パーソナルケア装置。
