Signal transmitting device in hard disk drive

A signal transmitting device of a hard disk drive having a recording medium for storing data, at least one head for reading and writing data on said recording medium, an actuator for positioning said head above a desirable track on said recording medium, a pivot for rotatably supporting said actuator on a base of said hard disk drive, a spindle motor for rotating said recording medium at a constant speed, and a printed circuit substrate for communicating with said head in response to a head signal transmitted therebetween, said signal transmitting device comprising:

• a pivot bearing mounted to said pivot, said pivot bearing comprising:
• an inner rim of cylindrical shape having a hollow core and a plurality of annular grooves formed in an exterior surface thereof, said hollow core being formed to fit over said pivot;
• an outer rim of cylindrical shape having a hollow core, a plurality of annular grooves formed in the surface of said hollow core of said outer rim and a smooth exterior surface;
• said outer rim and said inner rim being joined by placing said inner rim in said hollow core of said outer rim so as to align said plurality of annular grooves of said inner and outer rims;
• electrically conductive oil provided within each of said aligned plurality of annular grooves;
• and
• a plurality of pads disposed along an end portion of said inner rim and an end portion of said outer rim, said pads being connected to the electrically conductive oil for providing a transmission path through which said head signal is transmitted between said head and said printed circuit substrate.

A signal transmitting device of a hard disk drive having a printed circuit substrate, a recording medium for storing data via a magnetic recording system, one or more heads for storing and picking up said data on said recording medium, and a spindle motor for rotating said recording medium at a constant speed, said signal transmitting device comprising:

• an actuator rotatably mounted to a pivot, said actuator positioning at least one of said heads over a desired track on said recording medium;
• and
• a pivot bearing mounted on said pivot for supporting said actuator on a base, said pivot bearing being provided with electrically conductive oil, said electrically conductive oil providing a transmission medium through which a signal from at least one of said heads is transmitted to the printed circuit substrate of said hard disk drive, said pivot bearing comprising:
• an inner rim of cylindrical shape having a hollow core and a plurality of annular grooves formed in an exterior surface thereof, said hollow core being formed to fit over said pivot;
• an outer rim of cylindrical shape having a hollow core, a plurality of annular grooves formed in the surface of said hollow core of said outer rim and an exterior surface of constant diameter;
• said outer rim and said inner rim being joined by placing said inner rim in said hollow core of said outer rim so as to align said plurality of annular grooves of said inner and outer rims;
• said electrically conductive oil being provided within each of said aligned plurality of annular grooves;
• and
• a plurality of pads disposed along an end portion of said inner rim and an end portion of said outer rim, said pads extending from said end portions of said inner and outer rims to corresponding ones of said annular grooves of said inner and outer rims, respectively, said pads being connected to the electrically conductive oil and providing a transmission path for an electrical signal transmitted between said heads and said printed circuit substrate.

A signal transmitting device of a hard disk drive having a printed circuit substrate, a recording medium for storing data via a magnetic recording system, one or more heads for storing and picking up said data on said recording medium, and a spindle motor for rotating said recording medium at a constant speed, said signal transmitting device comprising:

• an actuator rotatably mounted to a pivot, said actuator positioning at least one of said heads over a desired track on said recording medium;
• and
• a pivot bearing mounted on said pivot for supporting said actuator on a base, said pivot bearing being provided with electrically conductive oil, said electrically conductive oil providing a transmission medium through which a signal from at least one of said heads is transmitted to the printed circuit substrate of said hard disk drive, said pivot bearing comprising:
• an inner rim and an outer rim, said inner rim and said outer rim each comprising one or more annular grooves, each of said annular grooves of said inner rim being aligned with each of said annular grooves of said outer rim, each of said aligned annular grooves accommodating said electrically conductive oil for transmitting said signal from at least one of said heads to said printed circuit substrate of said hard disk drive;
• and
• a plurality of pads disposed along an end portion of said inner rim and an end portion of said outer rim, said pads being connected to said electrically conductive oil for providing a transmission path through which said head signal is transmitted between said head and said printed circuit substrate.