 Multifocal objective |
| One object of the present invention is to produce a photographic objective, which is of particular ... |
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| Objective lens system |
| A primary object of the present invention is to provide an objective lens system consisting of a ... |
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| Diffractive multifocal optical device |
| The invention relates to a diffractive multifocal optical element comprising a phase zone plate ... |
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| Grating lens and focusing grating coupler |
| An object of the present invention is to provide a grating lens in which the spot diameter of a ... |
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| Powerless field-corrective lens |
| Curvature of an optically imaged field, denoted .rho., arises in an optical imaging system when ... |
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| Error detecting device for optical head |
| An object of this invention is to provide an error detecting device for an optical head which is ... |
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| Optical recording/reproducing apparatus for optical disks with various disk substrate thicknesses |
| In consideration of the above drawbacks, it is an object of the invention to provide an optical ... |
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| High resolution imagery systems and methods |
| Systems and methods in accordance with the invention dispose at least one holographic areally ... |
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| Compound objective lens having two focal points |
| A first object of the present invention is to provide, with due consideration to the drawbacks of ... |
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| Superresolution scanning optical device |
| A first superresolution scanning optical device according to the present invention comprises image ... |
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Optical storage medium, optical storage method, optical reading method, optical reading apparatus, optical retrieving method and optical retrieving apparatus
| Details |
Inventors: Kawano, Katsunori; Nishikata, Yasunari; Ishii, Tsutomu;
Assignee: Fuji Xerox Co., LTD (Tokyo, JP)
Primary Examiner: Hindi; Nabil
Assistant Examiner:
Attorney, Agent or Firm: Oliff & Berridge, PLC
An optical storage medium of the present invention enables storage of data with high precision at high speed, and rewriting of data at high speed without an erasing process. Optical storage, reading and retrieving methods and optical storage, reading, and retrieving apparatuses using the medium are also provided. The optical storage medium has at least a polarization-sensitive member having the photo-induced birefringence property, such as a member made of polyester polymer having cyanoazobenzene as a side chain. The above apparatuses have spatial light modulator capable of modulating polarization. The modulator provides information of bit of two-dimensional data to each corresponding pixel by application or non-application of a voltage, and modulates the polarization of the beam incident on each pixel. Thereby, a signal beam transmitted through the spatial light modulator having a spatial polarization modulation corresponding to the two-dimensional data is obtained. The signal beam illuminates the optical storage medium, and at the same time, a reference beam illuminates the same region in the medium where the signal beam illuminates. Thus a hologram of the polarization modulation of the signal beam corresponding to the two-dimensional data is stored in the optical storage medium. |
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DETAILED DESCRIPTION The present invention has been made in view of the above circumstances and has an object to provide an optical storage apparatus and optical storage method using thereof which can perform high-density storing at high speed and can rewrite data at high speed without an erasing process.
Another object of the present invention is to provide an optical reading apparatus and optical reading method using thereof which can read out data stored in an optical storage medium with very high precision at high speed.
Further object of the present invention is to provide an optical retrieving apparatus and optical retrieving method using thereof which can retrieve a necessary piece of data with high precision at high speed from an optical storage medium in which a large amount of data is stored.
Further object of the present invention is to provide an optical storage medium suitable to high-speed storing, reading, retrieving data with high precision, and high speed rewriting of data without requiring an erasing process.
To achieve the objects and in accordance with the purpose of the invention, as embodied and broadly described herein, an optical storage medium of the present invention is a polarization-sensitive member that have a photo-induced birefringence property.
The optical storage medium of the present invention may also be a sheet-like light-transmitting material which has the polarization-sensitive member with the photo-induced birefringence property at least on one side as a layer.
The optical storage method of the present invention provides a signal beam that retains spatial polarization modulated data modulated by a spatial light modulator capable of modulating polarization of a light beam.
The signal beam and a reference beam simultaneously illuminate an optical storage medium for storing a hologram of the polarization modulated data retained by the signal beam in the optical storage medium.
In the optical reading method of the present invention, a read beam illuminates an optical storage medium storing a hologram generated cooperatively by a reference beam and a signal beam retaining spatial polarization modulated data
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