| 摘要 |
1,187,629. Photographic - pipe - composing- COMPAGNIE FRANCAISE THOMSON HOUSTON-HOTCHKISS BRANDT. 18 Oct., 1967 [18 Oct., 1966], No. 47516/67. Heading B6W. [Also in Division G2] An electro-optical recording system for computers comprises a mask M bearing an orthogonal array of windows each containing a hologram of a different character, and a digital electro-optical light deflector by which the windows may be selectively illuminated in coherent light from laser S to project a selected character on to photographic film B through diaphragm G. Film B is moved past the diaphragm intermittently. The optical deflector may comprise four cells each consisting of an electro-optical crystal between transparent electrodes, or a birefringent crystal. The optical axes of the birefringent crystals may each produce a deflection of the extraordinary ray in opposite orthogonal directions, or the axes may be aligned while the crystal thicknesses increase the powers of 2. |
