Method of grinding a substrate and method of manufacturing a glass substrate and a magnetic recording medium by the use of the glass substrate
AssigneeHoya Corporation
InventorsShozo Iwabuchi, Masahiro Katagiri
Life of this patent
Estimating the term…
Abstract
In a method of grinding side end surfaces of substrates, spacers are interposed between the substrates to form a stack of the substrates and the spacers. The spacers are slightly smaller in size than the substrates. The stack of the substrates and the spacers are ground by a rotatable brush or pad on the side end surfaces of the substrates so as to smooth chamfered portions of the substrates together with the side end surfaces.
Claims6
1-18 (canceled).
A glass substrate for magnetic recording medium, having a pair of main surfaces and inner and outer side end surfaces each of which is contiguous to the main surfaces and which have inner and outer side end surface portions, wherein the outer side end portion is ground together with the inner side end portion and has a surface roughness smaller than the inner side end portion.
Dependencies are inferred from the claim text.