Browse Prior Art Database

Magnetic Spring Return / J-Block / Flex Cable Bias Tuner in Rotational Actuator with Fewer Suspensions for Load/Unload Technology

IP.com Disclosure Number: IPCOM000013649D
Original Publication Date: 2000-Dec-01
Included in the Prior Art Database: 2003-Jun-18
Document File: 1 page(s) / 54K

Publishing Venue

IBM

Abstract

Magnetic Spring Return J-Block Flex Cable Bias Tuner in Rotational Actuator with Fewer Suspensions for Load/Unload Technology Disclosed is a system that helps tune fewer armed suspensions in a rotary actuator against flex cable bias within ramp load/unload disk drive designs. Due to the large variation from flex cable to flex cable, it is difficult to maintain actuators with fewer suspensions on the load unload ramp during rotational shocks.

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  Magnetic Spring Return / J-Block / Flex Cable Bias Tuner in Rotational Actuator with Fewer Suspensions for Load/Unload Technology

   Disclosed is a system that helps tune fewer armed suspensions in a rotary actuator against flex cable bias within ramp load/unload disk drive designs. Due to the large variation from flex cable to flex cable, it is difficult to maintain actuators with fewer suspensions on the load unload ramp during rotational shocks.

   The system typically consists of the following parts: 1) Actuator 2) VCM (Voice Coil Motor) and 3) Magnetically Attractive Material

Metal Material

Actuator

     The system is designed to use VCM (Voice Coil Motor) stray magnetic field to cause in the above figure, a clockwise rotation. The metal material position shown uses these stray fields to be drawn closer to the VCM edge. Typically, the closer the metal material is near a VCM edge, the higher the net force. As the actuator rotates counterclockwise, the metal material becomes more and more distant from the VCM edge. Typically, as magnetic metal material becomes more distant from a magnetic field, the force that is produced also becomes more and more diminished.

     During rotational shocks to disk drives, the actuator would be thrown into the data zone. In the above case, the data zone (not shown) is in a counterclockwise direction. Since the metal material causes a clockwise force, the rotational forces on the actuator are countered and minimize the net force in the directio...