Scribing method, a cutter wheel, a scribing apparatus using the cutter wheel, and an apparatus for producing the cutter wheel

Abstract

In a glass cutter wheel where a blade edge is formed on a disk-shaped wheel, grooves having a predetermined shape are formed at a predetermined pitch in a 1/4 or smaller or 3/4 or smaller blade edge line portion of the entire perimeter of the blade edge. The ratio of the groove portion to the entire perimeter, which largely contributes to a scribing characteristic, is changed such that a desired scribing characteristic can be obtained.

1 . A cutter wheel, wherein: groove regions are formed over the entire perimeter of the edge line portion; and a region wherein the depth of the grooves becomes deeper, and a region where the depth of the grooves becomes shallower, are continuously provided, wherein the depth of the plurality of grooves is 2-200 μm in order that when performing scribing along a scribe line on a brittle material substrate using the wheel a vertical crack is formed in the brittle material substrate that varies periodically in depth along the scribe line without extending through the brittle material substrate, wherein the scribe line is formed on the brittle material substrate, and the vertical crack is extended by applying a force to widen horizontally the vertical crack, the vertical crack being formed along the vertical direction of the scribe line on the brittle material substrate, wherein the depth of the vertical crack is periodically varied according to the depth of the plurality of grooves under a constant load. 
   
   
       2 . The cutter wheel according to  claim 1 , wherein the brittle material substrate is a glass substrate.