Appeal No. 2000-1569
Application 08/964,686
claims 1, 25, 26, 30 and 31.
The disclosed invention pertains to a method for
manufacturing a magnetic disk drive in which the magnetic disks
have improved surface smoothness. More particularly, the
invention is based on the selection of a chemical attacking agent
for softening a portion of the substrate material and the
selection of colloidal particles for removing the softened
portion of the substrate material.
Representative claim 1 is reproduced as follows:
1. A method for manufacturing a magnetic disk drive,
said disk drive having at least one disk, said at least one disk
being comprised of substrate material and magnetic material, said
method comprising the steps of:
attacking said substrate material through the use of a
chemical attacking agent, said chemical attacking agent reacting
with said substrate material to soften a portion of said
substrate material; and
removing said portion of said substrate material by using
colloidal particles such that said substrate material has a
surface roughness of less than 4A, said surface roughness being
calculated using an atomic force microscope.
The examiner relies on the following references:
Rea 4,475,981 Oct. 9, 1984
Kijima et al. (Kijima) 4,833,001 May 23, 1989
2
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