OPTICAL RECORDING AND READING MEDIUM

• Main Authors: TAKEDA YUUICHI, NUMATA SHIYUNICHI, KANESHIRO TOKUYUKI
• Format: Patent
• Language: English
• Published: 13.08.1985
• Subjects: AUXILIARY PROCESSES IN PHOTOGRAPHY; CINEMATOGRAPHY; COLOUR PRINTING; ELECTROGRAPHY; HOLOGRAPHY; INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; LINING MACHINES; PERFORMING OPERATIONS; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR,STEREO-PHOTOGRAPHIC PROCESSES; PHOTOGRAPHY; PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHYSICS; PRINTING; PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; STAMPS; TRANSPORTING; TYPEWRITERS

PURPOSE:To safely write information by low output laser, by recording information by utilizing the crystal change of an org. substance film by the beam energy of high intensity enregy beam. CONSTITUTION:An org. substance film absorbing high density energy beam such as laser beam with good efficiency and showing the change in an absorption spectrum by the change of a crystal is utilized to form a part changing in beam transmissivity. When a metal film is formed to the front or the under surface of the org. substance film, a part changing in beam reflectivity on the basis of the change in the absorption spectrum of the org. substance is formed by laser beam. This thin metal film comprises a material having mechanical and dynamical strength and reflecting laser beam, for example, Al, Au, Cr, Ni, Ag, Pt, Cu or Fe. As the material constituting the thin org. substance film, non- metal phthalocyanine, copper phthalocayanine, cobalt phthalocyanine or aluminum phthalocyanine chcloride, which shown large absorbancy to beam having a wavelength ranging from 550nm to 700nm and scarecely changed in absorbancy of beam with the wavelength in said range by crystal change due to beam energy absorbed thereby, are designated.