METHOD OF ORIENTATION OF BLANK ON WORKING POSITION AT CUTTING DIFFRACTION GRATING Russian patent published in 1995 - IPC

FIELD: optical industry. SUBSTANCE: blank is positioned on dividing carriage, coordinates of width of grating to be cut are mated with coordinates of length of working surface of correcting templet by means of moire interferometer. Prior to securing the blank, it is fixed relative to bed. Then carriage is moved relative to blank, with templet disconnected, through distance equal to difference of distances between ruled grooves of grating whose pitch is multiple to division value of moire interferometer band and ruled grooves of grating at preset pitch in its center. Amount of motion of carriage is checked by number of moire bands corresponding to this amount. After securing the blank on carriage, carriage is returned to initial position. EFFECT: enhanced reliability. 2 dwg