| 摘要 |
PROBLEM TO BE SOLVED: To provide a cutting tool for forming scribe lines on a brittle material substrate having high hardness, and a scribing method and a scribing device using the tool.SOLUTION: A cutting tool 10A has a columnar support section 11a and a cutting point 12a provided for the tip on one side thereof. Then, the cutting point 12a is in a conical shape and is formed at the tip portion on one side of the columnar support section 11a so as to match the central axis of the support section 11a whose tips are in a columnar shape. The cutting tool 10A forms a scribe line while maintaining an angle formed by the central axis and a brittle material substrate 17 at an acute angle of a first prescribed angle &thetas;, and after forming a scribe line of a predetermined length or forming a predetermined number of scribe lines, rotates the cutting tool 10A around the central axis of cutting tool by a predetermined second prescribed angle to perform scribing. |
