| 摘要 |
<p>An improvement in a thin film magnetic data transducer (10) which prevents capacitive coupling between the transducer (10) and the disk (7) of a disk drive system for preventing possible damage to the transducer (10). The magnetic circuit of the transducer is attached to one end of an electrical connection (28, 30), and the other end of the electrical connection is attached to a ground (104) or a fixed predetermined potential. In the preferred embodiment of the present invention, the electrical connection is the center bond pad (32, 56) connection which is disconnected from the coil bond pad (50) and connected to the magnetic circuit (12, 22). With the disk (7) and the magnetic pole tips (14, 24) of the magnetic circuit at the same potential, capacitive charging and consequent current flow or arcing or discharge noise between the two are prevented. The present invention also prevents noise from current due to the variable capacitive coupling of the coil (18, 20) to the disk (7) during disk (7) rotation. The thin film magnetic transducer (10) is fabricated by depositing successive layers of an electrical insulating material (34), a magnetic material (22), insulating material (34), electrical conducting material for a coil (18, 20), insulating material (34) and magnetic material (12), in the order named on a substrate. The coil (18, 20) is a spiral and the magnetic material layers (12, 22) are joined (56) with each other at the inner end of the coil and encircle the coil (18, 20), providing a magnetic gap (54) between pole tips (14, 24) outside of the outer periphery of the coil (18, 20). One magnetic layer (12) has an integral extension (28) connected to the center bond pad (32), extending from the location where the magnetic layers are joined (56). The center bond pad (32) is connected to the frame (5) of the disk drive as are the disks (7), which is usually ground potential (104). <IMAGE> <IMAGE></p> |
