| 摘要 |
PURPOSE:To simplify the positional adjustment of mirrors and to make a titled device compact by changing the position of one of two pieces of mirrors which are respectively inserted between two pieces of parabolic mirrors and a base material thereby changing the intersection angle of the two parallel luminous fluxes on the fixed base material. CONSTITUTION:Respectively two pieces of plane mirrors 51, 52 and 51', 52' are inserted between parabolic mirrors 4, 4' which change diversion luminous fluxes to parallel luminous fluxes F, F' and a fixed base material. The mirrors 52, 52' are so constituted as to be moved on a line Y-Y and a line Y'-Y', whereby the intersection of two luminous fluxes at an optional angle on the material 6 is made possible. Respectively a pair of the mirrors 51, 52 and 51', 52' are used and mirror pairs to be used respectively exclusively for various gratings are beforehand prepared for the number of various gratings so that the mirror pairs can be exchanged according to the request for the number of gratings. Then the need for the fine adjustment of the position of the mirrors is eliminated and the device is made compact. |
