METHOD FOR ERASING OPTICAL RECORDING

摘要

PURPOSE:To enable local erasing with a photochemical hole burning PHB memory for which a hole burning phenomenon is used by projecting continuous light of a required wavelength on the memory, thereby erasing the recording. CONSTITUTION:Laser light of a narrow beam width is wavelength-swept stepwise at wavelength intervals of about 5 times the beam width in the nonuniform absorption spectra of a material which allows PHB recording, by which holes are formed and the recording is executed. The hole formation is then executed uniformly and continuously over the entire part of the corresponding molecules when the continuous laser light of the wavelength range used for the recording is projected. The nonuniform spectra similar to the nonuniform spectra in the unrecorded state are thereby applied and the local erasing is executed.