Patent ID: 7534360
Filing Date: 2009-05-19
Classification: C30B,H01J,Y10T

Abstract:
1. A method of making a diamond product having a projection or a depression on a surface thereof by etching, said method comprising the steps of: forming a diamond substrate with a mask layer including a metal layer in at least one part thereof; etching said diamond substrate formed with said mask layer with a plasma of a mixed gas composed of a gas containing an oxygen atom and a gas containing a fluorine atom; and monitoring intensity ratio A/B of the mixed gas, where A is an intensity of an emission peak caused by atomic oxygen and B is an intensity of an emission peak caused by molecular oxygen, wherein said fluorine atom has a concentration within the range of 0.04% to 6% with respect to the total number of atoms in said mixed gas, said plasma is produced by generating a high-frequency discharge between two plate electrodes, said high-frequency discharge is generated by supplying an electric power of not less than 0.28W/cm wherein said mixed gas contains nitrogen gas in an amount such that the intensity ratio A/B of said mixture is greater than the intensity ratio A/B of the mixed gas with no nitrogen.