Scribing wheel, method for manufacturing the scribing wheel, and scribing method

摘要

A scribing wheel for scribing a brittle material-made substrate. Disc-shaped scribing-wheel base material in use is so designed that mid-portion of disc periphery has the largest diameter. Diamond film is formed on the periphery by a CVD method. The periphery is ground in the middle so that a plane including a circle defined by ridge line becomes perpendicular to the central axis of the scribing wheel.

主权项

1. A scribing wheel comprising:
a scribing-wheel base material; a diamond film formed on a cutting-edge part of said scribing-wheel base material; and a ground region formed by grinding said diamond film by a mechanical grinding technique, said scribing-wheel base material having a form of a disc with a largest-diameter part having a central axis and inclined surfaces formed at a periphery of said disc, said scribing-wheel base material having formed at a periphery thereof one of the following: a circumferential surface whose axis coincides with said central axis, the circumferential surface being curved inwardly with respect to said central axis of said base material, and a circumferential surface whose axis coincides with said central axis, the circumferential surface having a V-shaped section defined by an inwardly-bent shape with respect to said central axis of said base material.