Dynamic magnetic information storage or retrieval – Head mounting – Disk record
Reexamination Certificate
2008-01-15
2008-01-15
Evans, Jefferson (Department: 2627)
Dynamic magnetic information storage or retrieval
Head mounting
Disk record
C360S245800, C360S246000
Reexamination Certificate
active
07319573
ABSTRACT:
Embodiments of the invention provide a magnetic disk drive which has improved electrical properties owing to a reduction in the loss of transmission line, improved vibration properties owing to a reduction in the stiffness of wiring around the head, and a flat impedance in the transmission line. In one embodiment, a magnetic disk drive comprises a suspension; a magnetic head coupled with the suspension and configured to write and read information to and from a magnetic recording medium; and a transmission line disposed on the suspension to transmit writing and reading information to and from the magnetic head. The transmission line includes a writing line and a reading line, a lower conductor disposed underneath the writing line and the reading line, and an insulating layer interposed between the lower conductor and the writing and reading lines. The lower conductor comprises copper or copper-based alloy and has a thickness of substantially less than 25 μm, desirably about 2-12 μm, and more desirably about 5 μm.
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Evans Jefferson
Hitachi Global Storage Technologies Japan Ltd.
Townsend and Townsend / and Crew LLP
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