Patent ID: 6994332

Claim:
A vibration damping actuator comprising: a cup-shaped housing; a guide hole disposed extending through the housing on the center axis thereof; an output member disposed spaced apart from an opening end of the housing; an elastic connecting member elastically connecting the output member to the housing; a guide rod disposed on the output member and positioned inserted into the guide hole; a coil member installed to one of the housing and the output member; an armature including a ferromagnetic body and/or a permanent magnet disposed on an other of the housing and the output member, the armature being adapted to exert actuating force on the output member by means of application of electric current to the coil member, causing the output member to undergo oscillating displacement in a center axial direction of the housing, on the basis of guiding action for the guide rod by the guide hole; the guide hole open onto a bottom face of the housing; an annular shoulder portion formed to an inside of an opening of the guide hole; a lid metal plate fitted into the opening of the guide hole with a size enough to prevent inward displacement thereof into the guide hole by the annular shoulder portion; an engaging groove disposed on an inner circumferential surface of the opening; a snap ring of C-letter shape fitted into the engaging groove to prevent the lid metal plate from becoming dislodged from the opening; a rubber layer boned on and coating substantially entirely an inside face of the lid metal plate; and a sealing rubber layer bonded on and coating the inside face of the lid meal plate, said sealing rubber layer being formed by utilizing an outer peripheral portion of the rubber layer, wherein wherein the lid metal plate is pressed by the snap ring of C-letter shape and the sealing rubber layer is pushed against the annular shoulder portion, thereby sealing the opening of the guide hole, and a rubber buffer layer positioned in opposition to a distal end portion of the guide rod is formed by a center portion of the rubber layer so that the distal end portion of the guide rod comes into cushioned abutment with the lid metal plate via the rubber buffer layer in order to provide a stop mechanism for cushionwise limiting of an amount of displacement of the output member.