Patent ID: 9201179
Filing Date: 2015-12-01
Classification: B29D,G02B,Y10T

Abstract:
1. A method of manufacturing a blazed diffractive grating in which a plurality of grooves each extending in a first direction are arrayed at a grating pitch in a second direction perpendicular to the first direction, the method comprising: a first step of forming a first groove having a first surface and a second surface by relatively moving, in the first direction at a first position in the second direction, an object and a cutting tool having a first cutting blade and a second cutting blade to cut the object to respectively form the first surface and the second surface; a second step of forming, after the first step, a second groove having a third surface and a fourth surface by relatively moving, in the first direction at a second position separated from the first position in the second direction by the grating pitch, the object and the cutting tool having the first cutting blade and the second cutting blade to cut the object to respectively form the third surface and the fourth surface; and a third step of forming, after the second step, a blazed surface of the first groove using the first cutting blade by relatively moving, in the first direction at a third position between the first position and the second position in the second direction, the object and the cutting tool with the second cutting blade not in contact with the second surface of the first groove to cut the first surface of the first groove.