公开(公告)号：JPS6445689A

公开(公告)日：1989-02-20

申请号：JP20326187

申请日：1987-08-14

Applicant: KAO CORP

Inventor： TANAKA MASAOMI ,  TSUJII KAORU

IPC: B41M5/26 ,  G11B7/24 ,  G11B7/243 ,  G11B7/244

Abstract: PURPOSE:To obtain an optical recording material having excellent environmental stability, by providing a particle layer comprising single dispersed particles arranged in order on a surface of a substrate, and reading the presence or absence of diffracted light from the particle layer or the differences in the magnitude of the diffracted light as signal information. CONSTITUTION:This optical recording material strongly reflects only rays of a specified wavelength as a recording signal, and the wavelength of the rays reflected as the recording signal can be arbitrarily varied by varying the size of single dispersed particles used as the recording medium. For example, when spherical single dispersed particles having a diameter of 0.15-0.4mum constitute a regulated structure, the surface of the particle layer emits monochroic rays with clear metallic luster due to the diffraction of visible rays. As a substrate 1, any of conventionally known substrates may be used. The thickness of the regulated structure layer 2 is preferably 0.5-10.0mum, from the viewpoints of higher intensity of diffracted rays and higher accuracy in writing. A hardened layer 3 is provided for fixing the regulated structure layer 2, and it is necessary to pay attention to the refractive index of a resin being used therefor.