Information recording disc and information recording/reproducing apparatus
AssigneeSony Corporation
InventorsKoichiro Kishima, Isao Ichimura, Yuji Kuroda, Kiyoshi Osato
Life of this patent
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Abstract
An anti-reflection coating layer is formed on the surface portion of a recording medium. This enables to obtain a margin for the air gap thickness change when recording/reproducing an information signal using the “near-field technique” as well as minimize a data loss caused by a collision. Furthermore, the present invention provides a film configuration which can easily be produced.
Claims15
An information recording disc including a signal recording layer for use in an information recording/reproducing apparatus having a light source for emitting a light flux and a focusing element for focusing the light flux to be applied to the signal recording layer,
- wherein the signal recording layer is positioned approximately on a surface portion facing to the focusing element and the surface portion is coated with an anti-reflection coating film.
An information recording disc including a signal recording layer for use in an information recording/reproducing apparatus having a light source for emitting a light flux and a focusing element for focusing the light flux to be applied to the signal recording layer,
- wherein the distance between the focusing element and a surface portion facing to the focusing element is not greater than a wavelength of the light flux, and
- wherein the surface portion facing to the focusing element is coated with an anti-reflection coating film.
An information recording/reproducing apparatus comprising:
- a rotation mechanism for holding and rotating an information recording disc;
- a light source;
- and
- a focusing element for focusing a light flux emitted from the light source so as to be applied to a signal recording layer of the information recording disc;
- wherein the information recording disc is used in such a manner that a distance between the focusing element and the surface portion facing to this focusing element is not greater than a wavelength of the light flux, and the information recording disc includes an anti-reflection coating film formed on the surface portion facing to the focusing element.
Dependencies are inferred from the claim text.