PURPOSE: To reduce the size of a spatial optical modulator and eliminate the need for a combinational adjustment, and to operate it effectively as an information transmitter by modulating incident light from a remote light source by a material which has electrooptic effect, and reflecting the modulated light to the light source side in parallel to the incident light.
CONSTITUTION: A light beam from a master station when made incident as incident light (a) is reflected by a point P on a reflecting surface 12, passed through liquid crystal 21 and reflected at a point Q on a reflecting surface 11, and passed through the liquid crystal 21 again to obtain reflected light (b). When, however, the light is passed through the liquid crystal 21, a voltage is applied between electrodes 22a and 22b by an information signal to transmit the reflected light (b) after optical modulation. Therefore, no light source is necessary on the side of this spatial optical modulator, and the information signal applied between the electrodes 22a and 22b of the spatial optical modulator is transmitted to the remote light source side. Thus, the efficiency of information transmission is improved. Further, this spatial optical modulator is provided with a reflecting plate and a modulator in one body, so there is no unnecessary space to attain the size reduction and the need for the combinational adjustment is eliminated.
MORIFUJI MOTOYOSHI
TSUMURA TOSHIHIRO
KAMEI SHIGEKI
WARATANI HIROHARU
TSUMURA TOSHIHIRO
HITACHI KIDEN KOGYO KK
| JPS5810402B2 | 1983-02-25 | |||
| JPS51140641A | 1976-12-03 |