Disk drive actuator having a bobbin contacting a closed coil periphery at two locations

An actuator for a disk drive, the actuator comprising:

• an actuator body having an actuator pivot bore and an actuator arm extending away from the actuator pivot bore along an arm longitudinal axis;
• a conductive coil attached to the actuator body, the conductive coil including first and second lateral legs joined by first and second longitudinal legs to form a closed coil periphery, the first longitudinal leg defining a longitudinal leg length measured generally parallel to the arm longitudinal axis, the first and second lateral legs each being disposed in an orientation that is generally transverse to the arm longitudinal axis, the first lateral leg being disposed closer to the actuator pivot bore than the second lateral leg, wherein the first and second longitudinal legs join the second lateral leg at a first interior bend location and at a second interior bend location within the closed coil periphery, respectively;
• and
• a bobbin disposed within the closed coil periphery and contacting the conductive coil at only the first interior bend location and the second interior bend location, the bobbin defining a total bobbin length and an average bobbin with, and wherein the total bobbin length is at least 3 times the average bobbin width.

An actuator for a disk drive, the actuator comprising:

• an actuator body;
• a conductive coil attached to the actuator body, the conductive coil defining a closed coil periphery;
• and
• a W-shaped bobbin disposed within the closed coil periphery and attached to the conductive coil, the W-shaped bobbin including a means for ensuring adequate frequency separation between an actuator system butterfly vibration mode and an actuator arm sway vibration mode.

A disk drive comprising:

• a disk drive base;
• a spindle rotably coupled to the disk drive base, and a disk attached to the spindle;
• and
• an actuator, the actuator including:
• an actuator body having an actuator pivot bore and an actuator arm extending away from the actuator pivot bore along an arm longitudinal axis;
• a conductive coil attached to the actuator body, the conductive coil including first and second lateral legs joined by first and second longitudinal legs to form a closed coil periphery, the first longitudinal leg defining a longitudinal leg length measured generally parallel to the arm longitudinal axis, the first and second lateral legs each being disposed in an orientation that is generally transverse to the arm longitudinal axis, the first lateral leg being disposed closer to the actuator pivot bore than the second lateral leg;
• and
• a W-shaped bobbin disposed within the closed coil periphery and contacting the conductive coil within the closed coil periphery at only a first location on the first longitudinal leg and a second location on the second longitudinal leg.