A hologram recording method for recording information of signal light as holograms in an optical recording medium, which includes illuminating signal light at the optical recording medium; illuminating reference light at the optical recording medium simultaneously with the signal light such that an interference pattern is formed by the signal light and the reference light intersecting in the optical recording medium; and shifting a region in the optical recording medium at which the signal light and the reference light intersect, by shifting an illumination position of the reference light along an optical axis of the signal light, thereby recording a plurality of holograms in the recording medium.

Hologram recording method and hologram recording device

A holographic recording medium includes a recording layer in which data are to be recorded as phase information of light by projecting a signal beam and a reference beam thereonto, a reflective surface disposed on the opposite side of the recording layer as viewed in the direction of signal beam and reference beam incidence on the holographic recording medium and formed with a convex pattern or a concave pattern having a trapezoidal cross-section, a minimum width of a convex surface of the convex pattern or a concave surface of the concave pattern being set equal to or larger than a beam spot diameter of the signal beam or the reference beam at a diffraction limit thereof. According to the thus constituted holographic recording medium, it is possible to easily remove noise light contained in a signal beam and a reference beam.

Method for recording and reproducing holographic data and holographic recording medium

A holographic recording and reproducing method for recording data in a holographic recording medium comprising a recording layer in which data are to be recorded as phase information of light by projecting a signal beam and a reference beam thereonto and a servo layer disposed on the opposite side of the recording layer as viewed in the direction of signal beam incidence on the holographic recording medium and having regions in which servo projections are formed by projecting the signal beam and the reference beam onto the holographic recording medium and reproducing holographic data from the holographic recording medium by projecting the reference beam onto the holographic recording medium, the holographic recording and reproducing method includes steps of setting an optical path of the signal beam so that the signal beam is projected onto other regions of the servo layer than the regions formed with the servo projections, setting an optical path of a servo beam different from that of the signal beam so that the servo beam is projected onto one of the regions of the servo layer in which the servo projections are formed after passing through an objective lens through which the signal beam passes and projecting the servo beam onto the servo layer along the thus set optical path of the servo beam.

Method for recording and reproducing holographic data and an apparatus therefor

A hologram recording method includes generating a signal beam with data formed by superimposing pattern data, the pattern data representing a pattern in which a large number of plural kinds of pixels having different tone values are arranged in a two-dimensional manner, on an image data of respective pixels represented by tone values corresponding to density, and recording a hologram by irradiating a converted beam formed by Fourier transformation of the generated signal beam with a lens and a reference beam to an optical recording medium.

Hologram recording method and hologram recording apparatus

There is provided a hologram reconstruction method including: onto an optical recording medium in which a hologram is recorded by simultaneously irradiating the Fourier transformed signal beam representing a digital data with a bright and dark image and removing a DC component and the Fourier transformed reference beam thereon, irradiating a first reference beam for reading out that is the same as the reference beam to generate a first diffracted light generated by the recorded hologram, and synthesizing a DC component of a predetermined phase with the generated first diffracted light to generate a first synthesized light; detecting an inverse Fourier transformed image of the first synthesized light to obtain first image data; irradiating a second reference beam for reading out that differs from the reference beam onto the hologram recorded on the optical recording medium to generate a second diffracted light from the recorded hologram, and synthesizing a DC component of a predetermined phase with the generated second diffracted light to generate a second synthesized light; detecting an inverse Fourier transformed image of the second synthesized light to obtain second image data; subtracting one of the first image data and the second image data from the other at each pixel of the light and dark image; and decoding the digital data based on the value obtained by subtraction.

Hologram reconstruction method and device

PROBLEM TO BE SOLVED: To make it possible to record image edge portions having data information of signal light at a high density without the occurrence of missing of the data. SOLUTION: This optical recording method consists of executing Fourier transform of the signal light having the data information in the image edge portions by a lens. A light shielding body formed with a light transparent part 21 which shields the zero order component of the Fourier transform image of this signal light and allows the components from the first order to third order in an x-axis plus direction or in the x-axis plus direction and y-axis plus direction to transmit, is arranged in front of the optical recording medium. The signal light and reference after the Fourier transform are transmitted through this light transparent part and the optical recording medium is irradiated with this light, by which the hologram is recorded in the optical recording medium.

Optical recording method, optical recorder, optical reading method, and optical reader

Binary two-dimensional digital data can be recorded in an optical recording medium as holograms in such a way that a recording area is made sufficiently minute correspondingly to the two-dimensional digital data by adequately limiting the spread of signal light and reference light without causing loss of the data and a read error during reconstructing. Signal light of a binary two-dimensional digital data image is subjected to Fourier transform by a lens. There is disposed forwardly of an optical recording medium a shading material having a circular, semicircular, sectorial, or L-shape light transmission part 21 that allows transmission of only components of 0th to n-th (n=1, 2, or 3) orders. The signal light after Fourier transform and reference light are transmitted through the light transmission part 21 for irradiation to the optical recording medium and a Fourier transform hologram is recorded in the optical recording medium.

Optical recording method and optical recording apparatus

PROBLEM TO BE SOLVED: To make it possible to sufficiently limit the spread of signal light and reference light and to sufficiently microminiaturize recording regions without the occurrence of missing of data and a read error at the time of reproduction in correspondence to two-dimensional digital data in the care of recording the binary two-dimensional digital data in an optical recording medium as holograms. SOLUTION: This optical recording method consists of executing Fourier transform of the signal light of the binary two-dimensional digital data image by a lens. A light shielding body having a light transparent part 21 of a circular, semicircular, sectorial or L shape which allows only the components from zero order to n-th (N=1, 2, or 3) order of the Fourier transform image of the signal light to transmit, is arranged in front of the optical recording medium. The signal light and reference light after the Fourier transform are transmitted through this light transparent part 21 and the optical recording medium is irradiated with this light, by which the Fourier transform hologram is recorded in the optical recording medium. COPYRIGHT: (C)2000,JPO

Optical recording method and optical recorded

PROBLEM TO BE SOLVED: To provide an image forming program, a printing server, an information processor, an information forming apparatus and an image forming method by which a user can easily change a printing setup by preventing the user from lossing his or her feeling of tension. SOLUTION: Recommendation setup and a specified value for determining whether to be a large amount of print are received from a user when a large amount of print is performed. When a large amount of print is performed, the recommendation setup received from the user or recommendation setup prepared in accordance with an entry that exceeds the specified value is selectably displayed together with the present printing setup to request the user to confirm the printing setup. COPYRIGHT: (C)2007,JPO&INPIT

Image forming program, printing server, information processor, image forming apparatus and image forming method

PROBLEM TO BE SOLVED: To provide a data storage device, coping with overlapping of data while the management information on the data to be stored is taken into consideration when there are data to be stored whose contents overlap SOLUTION: In this data storage device, a plurality of data to be stored and the management information on the storage of the data to be stored are retained in association with each other, a plurality of data to be stored which have partially common contents are detected among the plurality of data to be stored, the storage continued data is selected from the plurality of detected data to be stored, and the management information on the data to be stored, which are not selected as the storage continued data among the plurality of detected data to be stored is related as the management information for the selected storage continued data COPYRIGHT: (C)2008,JPO&INPIT

Data storage device and program

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