Optical recording medium and its use
AssigneeFujitsu Limited
InventorToshikazu Kanaoka
Life of this patent
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Abstract
An optical recording medium which comprises a holographic recording layer on which information is recorded by means of holography, a light shield member fixed to at least one of main surfaces of the holographic recording layer, a control electrode for controlling a light transmission state of the light shield member, wherein, the light shield member has a plurality of pixels obtained by dividing the light shield member on a recording unit region basis, and the light transmission state can be controlled pixel by pixel.
Claims16
An optical recording medium comprising:
- a holographic recording layer on which information is recorded by means of holography;
- a light shield member fixed to at least one of main surfaces of the holographic recording layer;
- and
- a control electrode for controlling a light transmission state of the light shield member, wherein
- the light shield member has a plurality of pixels obtained by dividing the light shield member on a recording unit region basis, and the light transmission state can be controlled pixel by pixel.
A method for recording information on an optical recording medium which comprises a holographic recording layer on which information is recorded by means of holography, a light shield member fixed to at least one of main surfaces of the holographic recording layer, and a control electrode for controlling a light transmission state of the light shield member, in which the light shield member has a plurality of pixels obtained by dividing the light shield member on a recording unit region basis, and the light transmission state can be controlled pixel by pixel, the method comprising the steps of:
- applying a predetermined voltage to the control electrode to make at least one of the pixels of the light shield member light-transmittable;
- irradiating the holographic recording layer with an object beam via the light-transmittable pixel in this state;
- and
- simultaneously irradiating the position irradiated with the object beam with a reference beam to record information on a region corresponding to the pixel.
A method for reproducing information from an optical recording medium which comprises a holographic recording layer on which information is recorded by means of holography, a light shield member fixed to at least one of main surfaces of the holographic recording layer, and a control electrode for controlling a light transmission state of the light shield member, in which the light shield member has a plurality of pixels obtained by dividing the light shield member on a recording unit region basis, and the light transmission state can be controlled pixel by pixel, the method comprising the steps of:
- applying a predetermined voltage to the control electrode to make at least one of the pixels of the light shield member light-transmittable;
- irradiating the holographic recording layer with a reference beam in this state;
- and
- detecting the reference beam via the light-transmittable pixel to reproduce information recorded on the region corresponding to the pixel.
A device for recording/reproducing information to/from an optical recording medium which comprises a holographic recording layer on which information is recorded by means of holography, a light shield member fixed to at least one of main surfaces of the holographic recording layer, and a control electrode for controlling a light transmission state of the light shield member, in which the light shield member has a plurality of pixels obtained by dividing the light shield member on a recording unit region basis, and the light transmission state can be controlled pixel by pixel, the device comprising:
- a mounting part on which the optical recording medium is mounted;
- a connection part to be electrically connected to the control electrode;
- a controller for electrically controlling the light shield member via the connection part;
- and
- a light emitter for emitting an object beam and a reference beam to the holographic recording layer.
Dependencies are inferred from the claim text.