Information writing method for an optical disc memory system utilizing a smectic chiral liquid crystal

DETAILED DESCRIPTION It is therefore an object of the invention to provide an optical disc memory with liquid crystal.
It is another object of the invention to provide an erasable and rewritable optical disc memory.
It is further object of the invention to provide an optical disc memory with which recording system can be simple and economic.
It is further object of the invention to provide an improved information recording system with high speed erasing and writing operations.
In order to accomplish the above and other objects and advantages, the inventor has employed a liquid crystal which exhibit a hysteresis in cooperation with means for giving to the liquid crystal a lagging in optical characteristics when external electric field is removed.
With this hysteresis, a nonvolatile binary cell capable of being rewritten is prepared.