| 摘要 |
PURPOSE:To improve producibility during copying by forming a recording layer of a material which reduces ability in light absorption in a visible or near- infrared-ray wavelength range by irradiation with ultraviolet rays, electron beams, or X rays, and thus eliminating unevenness of a pit pattern. CONSTITUTION:Ultraviolet-ray sensitive organic pigment, such as an aromatic diamine metallic complex, an aromatic dithiol metallic complex, an aliphatic dithiol metallic complex, a mercaptophenol metallic complex, and allyl aluminum salt of the kind, has maximum ability in absorption in a 600-1,200nm visible- near infrared rays range, but irradiation with a recording beam reduces or eliminates the ability in light absorption in said wavelength range. The recording beam is passed through a photomask with a desired pattern to illuminate a disk which has a layer containing said recording material, thus forming a pattern of irregular light absorption in the 600-1,200nm wavelength range. |
