| 摘要 |
PROBLEM TO BE SOLVED: To avoid interference of a blade at the time of machining plural grooves of a diffraction grating element. SOLUTION: In this method of machining optical diffraction grating element on a surface to be machined, a rotary spindle for supporting a machining blade 32 is provided on an axis of coordinate of each X, Y, Z axis of the surface to be machined, and a blade tip angle of the machining blade 32 fitted to the spindle is formed with an inclined angle so as to avoid the interference of the blade tip with a predetermined position for machining in the periphery of a curved surface of the diffraction optical grating element shape. With this method of machining diffraction optical grating element shape, fine shape machining of the optical diffraction grating element shape is enabled. |
