Appeal No. 96-0311
Application No. 08/155,771
The invention pertains to a magnetic disk and a glass
substrate therefor. More particularly, the problems
associated
with bent portions of the substrate resulting from the
deformation of a polishing pad are eliminated by providing for
certain maximum deflections of the bent portions with respect
to certain reference lengths.
Independent claim 1 is reproduced as follows:
1. A magnetic disk comprising a glass substrate and a
magnetic layer formed on the glass substrate wherein the
maximum deflection of any bent portion in the radial direction
of the magnetic disk with respect to a reference length of 2
mm is not more than 1,500D in the entire region of the surface
of the disk excluding annular areas having a width of 250Fm
which are respectively defined inwardly from annular lines at
which chamfered portions formed at the inner and outer
peripheries of the magnetic disk and the disk surface
intersect.
The examiner relies on the following references:
Uehara et al. 4-353619 2 Dec. 8, 1992
(Uehara) (JP)
Kojima et al. 5-89459 2 Apr. 9, 1993
(Kojima) (JP)
2Our understanding of these references is derived from
English translations thereof, said translations being part of
the record in this application.
2
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