Patent ID: 7967663
Filing Date: 2011-06-28
Classification: B24B,G02B,Y10T

Abstract:
1. A process of forming a deflection mirror in a light waveguide with a use of a dicing blade having a cutting end with a flat top cutting face and at least one slanted side cutting face, said process comprising a cutting step of cutting a surface of said light waveguide to a depth not greater than a width of said flat top cutting face, forming therein a groove having a slanted surface which is finished by said slanted side cutting face to define said deflection mirror, wherein said cutting step comprises sub-steps of: lowering said dicing blade relative to said light waveguide to a predetermined first level to form a preliminary groove having a depth less than a final depth intended to be given to said groove; releasing said dicing blade away from said light waveguide, measuring an open-end width of said preliminary groove to calculate a corresponding depth of said preliminary groove based upon said open-end width and a geometrical configuration of the dicing blade, and to calculate a target level in terms of said predetermined first level, said depth of the preliminary groove, and said final depth; and lowering said dicing blade to said target level relative to said light waveguide to form said groove having the final depth.