Optical recording system capable of changing the beam size

摘要: An optical shutter device comprises an electro-optic layer of a material that shows the Kerr effect, array regions defined on for controlling passage beam through layer, plurality electrodes provided in correspondence to applying predetermined electric field upon energization, driver circuit connected each pair energizing same independently from other, biasing d.c. bias voltage thereto, switching inverting polarity voltage, first polarizing above causing rotation plane angular direction, and second below second, opposite direction.