| 摘要 |
PURPOSE:To provide the titled medium excellent in recording sensitivity, reproduction sensitivity and record-preserving property, by a method wherein a thin film in which ultrafine particles of a specified (semi) metal are aggregated is provided as a recording layer, and the film is irradiated with a laser beam to melt a part thereof, thereby forming a depressed recess in the film. CONSTITUTION:A (semi)metal is vapor deposited on a substrate 1 by discontinuously colliding the vapor of the (semi)metal against the substrate 1, for example, from a skew direction to produce a thin film of the (semi)metal as the recording layer in a thickness of at least 1,000Angstrom , which film has a construction wherein ultrafine particles 2 of the (semi)metal are aggregated with a plurality of minute gaps capable of observed under an electron microscope, a packing density of an least 90% and an absorbency of at least 60% for a laser beam having a wavelength of 600-1,000nm. In recording, the depressed recess 4 for recording is produced in the film by a laser beam, and the record is reproduced by detecting by a reading laser device the laser beam flux reflected from a bottom surface of the depressed recess. |
