Appeal No. 95-3124
Application No. 08/125,311
Figure 1B of Sidman discloses a servo head 27 and a data
head 26 with a disk 16 located therebetween. Although Sidman
discloses “a head selection and amplifying unit 32 for
supplying a head selection signal to the drive control unit
10,” and “a circuit 34 for providing an automatic gain control
signal for the unit 32,” he “fails to specifically disclose
the claimed first data head which is collaterally paired with
the servo heads, the step of supplying a variable write
current to one of the data write head and thus drives the head
at the aforementioned current value” (paper number 8, page 3).
The examiner relies on Nguyen to show that “the use of a
VGA amplifier is notoriously well known” (paper number 8, page
4).
Weispfenning ‘439 discloses (Figure 1) a data transducer
18 and a servo transducer 14 supported on the same actuator
arm between two disks. According to the examiner, “the
primary source of undesired electromagnetic radiation to the 3
3Appellants’ acknowledged prior art (Figure 1B) discloses
a data head and a servo head collaterally paired and supported
by the same actuator arm between two disks. With such closely
spaced heads, electromagnetic noise leakage from the data head
to the servo head will occur during data writing by the data
head. Appellants have likewise acknowledged this problem
7
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Last modified: November 3, 2007