OPTICAL RECORDING AND READING METHOD

摘要

PURPOSE:To miniaturize a device and to carry out high-speed and high- resolution recording and reproduciton by using radiation for writing on an optical recording medium having a recording layer contg. a polydiacetylene derivative compd. and a specified diene compd. salt, and using the light having a shorter wavelength than the radiation for reading. CONSTITUTION:A soln. obtained by adding >=1 kinds of compd. shown by the general formula (1) or (2) to a polydiacetylene derivative compd. is coated on a discoid substrate made of glass and dried to form an optical recording medium. UV rays of 254nm are uniformly and sufficiently irradiated on the optical recording medium to polymerize the DA compd. in the recording medium to convert the recording layer into a blue film. Meanwhile, a semiconductor laser or a light emitting diode 10 radiating visible radiation in the region of wavelength in the range 550-750nm is used as an information reading means. A semiconductor laser 2 radiating IR in the region of wavelength in the range 800-900nm is used as the information writing means.