| 摘要 |
PURPOSE:To secure the contents of a memory correctly for a long period and to enable to restore a mirror to that memory position without error, by a method wherein a position of the mirror is stored, compared, judged and displaced through a driving device. CONSTITUTION:A position of a mirror is detected by detectors 10 and 10', whose output is converted into a binary code by decoders 11 and 11', and a binary code output corresponding to the position of the mirror of the decoders 11 and 11' is stored in memory circuits 12 and 12' by a signal from an operation circuit 16. An output signal of the memory circuits 12 and 12' is compared by comparison circuits 13 and 13' with an output signal of the decoders 11 and 11', a signal from a logical circuit 14 is applied to a mirror driving circuit 15 through an output signal of the comparison circuits 13 and 13' and a signal from the operation circuit 16. A motor for driving the right and left and the upper and lower sides of the mirror driving circuit 15 is driven and controlled based on the output signal and the mirror is restored to a plate where it was stored. |
