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AssigneeSony Corporation
InventorsHideyoshi Horimai, Kimihiro Saito
Estimating the term…
An optical information recording/playback apparatus having a compact construction of a recording/playback optical system. A light beam emitted from a laser coupler is modulated by a spatial modulator according to difference in the polarizing direction. The modulated light enters an S-polarized light hologram which separates an information light and a recording reference light of different polarizing directions and having different focal positions. An optical rotation is effected by a split optical rotation plate such that the polarizing directions of the information light and the recording reference light coincide with each other in a region of a holographic layer of a recording medium where the information light and the recording reference light are superposed on each other. The light beam having undergone the optical rotation is applied to the holographic layer through an objective lens, whereby the information carried by the information light is recorded in the holographic layer in terms of an interference pattern produced as a result of an interference between the information light and the recording reference light.
An optical information recording apparatus for recording information in an optical information recording medium having an information recording layer which is capable of recording information by means of holography, comprising:
An optical information playback apparatus for playing back information from an optical information recording medium having an information recording layer in which said information has been recorded by holography, comprising:
An optical information recording method for recording information in an optical information recording medium having an information recording layer which is capable of recording information by holography, comprising the steps of:
An optical information playback method for playing back information from an optical information recording medium having an information recording layer in which said information has been recorded by holography, comprising the steps of:
An optical information recording medium, comprising an information recording layer which is capable of holographically recording information in terms of an interference pattern caused by an interference between an information light and a recording reference light which are applied thereto, and capable of generating, when irradiated with a playback reference light, a reproduction light corresponding to the recorded information and emitting said reproduction light from the same side thereof as the side from which said playback reference light is applied.
Dependencies are inferred from the claim text.