PURPOSE: To obtain a two-layered type optical memory which is suitable for high- density, high-speed recording and reproducing operation by laminating the 1st transparent conductive film, thin electrochromic film, photoconductive film, the 2nd transparent thin film, and thin film for photomagnetic recording successively.

CONSTITUTION: The two-layered type optical memory 1 consists of the transparent substrate 2, transparent conductive film 3, electrochromic (EC) film 4, photoconductive film 5, transparent conductive film 6, and thin (MO) film 7 for photomagnetic recording. A voltage V modulated corresponding to the 1st digital signal is applied between the transparent conductive films 3 and 6 and a magnetic field H modulated corresponding to the 2nd digital signal is applied to the MO film 7. Laser light 8 with a specific quantity P is converted in discrete time series to focus and illuminate a recording position on the MO film 7 through a polarizer 9. Only the part is magnetized in a direction H by a temperature rise. Its transmitted light make the irradiated part of the photoconductive film 5 conductive and V is applied to the EC film 4 corresponding to the part to color the film 4. Thus, the memory which suits to the high-density, high- speed recording and reproducing operation is obtaind.