Optical recording medium, information recording method and infor

Details Optical recording medium, information recording method and infor Optical recording medium, information recording method and infor

1993-06-17

1995-06-27

Epps, Georgia Y.

Dynamic information storage or retrieval

Storage medium structure

Layered

369284, 3692751, 369286, 430270, 430495, 430945, G11B 700, G03C 172

Patent

active

054285992

ABSTRACT:
An optical recording medium includes in sequence a transparent substrate, a light-reflecting layer, a transparent intermediate layer and a light-absorbing layer. The light-reflecting layer and the light-absorbing layer are respectively formed as a layer of an organic coloring matter. The light-absorbing layer can cause deformation for recording information accompanied with a local charge in thickness of the transparent intermediate layer in response to a recording beam indicated to the light-absorbing layer through the transparent substrate. The transparent substrate, the light-reflecting layer, the transparent intermediate layer and the light-absorbing layer in combination constitutes a multi-layer optical element with respect to a reproducing beam having a prescribed wavelength and incident to the light-absorbing layer through the transparent substrate, the multi-layer optical element showing a minimum reflectance and a maximum reflectance of the reproducing beam at an incident surface of the optical recording medium at different thicknesses of the transparent intermediate layer. The transparent intermediate layer is formed in a thickness providing a mediate reflectance between the maximum and minimum transmittances. At the record pit, the multi-layer optical element is converted into a fresh element providing a successive reflectance change including a higher and a lower reflectance with respect to the reference reflectance at non-record parts, due to the change in thickness of the transparent intermediate layer.

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