Dynamic magnetic information storage or retrieval – Head mounting – For adjusting head position
Reexamination Certificate
2008-04-03
2011-12-27
Evans, Jefferson (Department: 2627)
Dynamic magnetic information storage or retrieval
Head mounting
For adjusting head position
C360S234500, C360S125310, C360S123390
Reexamination Certificate
active
08085509
ABSTRACT:
A write circuit and a head for a hard disk drive. The head includes a substrate that has an electrical ground and a write element that has a center tap. The head also has a resistor that is connected to the center tap and the electrical ground. The resistor provides a return path for AC and DC components of any common mode signal in a write circuit. The resistor can also generate heat that thermally expands the head and varies a head flying height. The write element is connected to an write driver circuit that provides in phase currents to a write element during the write operation and out of phase currents during a read operation. The out of phase currents allow for thermal expansion and flying height control even during a read operation.
REFERENCES:
patent: 6671118 (2003-12-01), Putnam et al.
patent: 7119990 (2006-10-01), Bajorek et al.
patent: 7589936 (2009-09-01), McFadyen et al.
patent: 2001/0036028 (2001-11-01), Putnam et al.
patent: 2002/0135943 (2002-09-01), Nishizawa et al.
patent: 2004/0240109 (2004-12-01), Hamann et al.
patent: 2005/0201001 (2005-09-01), Conteras et al.
Evans Jefferson
Samsung Electronics Co,. Ltd.
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