Patent application number | Description | Published |
20080219128 | OPTICAL PICKUP, OPTICAL INFORMATION RECORDING AND REPRODUCING APPARATUS AND METHOD FOR OPTICALLY RECORDING AND REPRODUCING INFORMATION - An optical pickup for recording a hologram by using an angle multiplexing method. An optical beam is separated into two beams, a signal beam and a reference beam having different convergence/divergence degrees, by using an optical component such as a diffraction lens. The signal and reference beams are made incident upon the same objective, and the optical component or the objective lens is moved in a direction perpendicular to an optical axis, to thereby realize angle multiplex recording. If an optical information recording medium is inclined, the optical component or the objective lens is moved along the direction along which the optical information recording medium moved to change an angle of the reference beam incident upon the optical information recording medium and compensate for degradation of a reproduction signal. | 09-11-2008 |
20080225670 | OPTICAL PICKUP, OPTICAL INFORMATION RECORDING APPARATUS AND OPTICAL INFORMATION RECORDING AND REPRODUCING APPARATUS USING THE OPTICAL PICKUP - In holographic recording, it is important to form stably an interference fringe between a reference beam and a signal beam in a holographic storage medium. To suppress factors degrading stability of the interference fringe, such as fluctuation of atmospheric air, position displacement of optical components and the like during propagation of the reference and signal beams, an optical pickup and an optical information recording/reproducing apparatus adopt an optical system structure providing a higher proportion of optical components shared by the reference and signal beams optical path than conventional optical system structure. To increase the proportion of shared optical components, the signal beam and the reference beam pass through the PBS prism as parallel beams and a concave lens is placed on a reference beam path just before the objective lens. | 09-18-2008 |
20080225909 | LASER LIGHT SOURCE DEVICE, OPTICAL INFORMATION RECORDING DEVICE, AND OPTICAL INFORMATION REPRODUCING DEVICE - The hologram recording technology expected to realize ultrahigh-density information recording is one of the post Blu-ray Disc technology. When we think about developing a drive based on this technology and suitable for consumer electronics, it is considered most desirable from the viewpoint of upward compatibility to solve the problem of the BD-compatibility. The problem in sharing the laser light source between the hologram recording device and the current optical disc device, however, is that the hologram recording requires a high-coherent, single-mode light beam, while the current optical discs requires a low-coherent, multi-mode light beam. In point of the coherence of the light source, the above two cases require the light beams of the characteristics opposite to each other, and this presents an important task. | 09-18-2008 |
20090073850 | OPTICAL DATA STORAGE DEVICE - The present invention aims to provide an optical data storage device capable of not only recording digital information by using holography, but also recording or reproducing information onto or from conventional optical discs represented by BD. In the optical data storage device of the present invention, a single light source is used for generation of both an optical beam for holographic medium curing and an optical beam for recording or reproducing information onto or from a BD or an HD DVD. Furthermore, the optical beam for holographic medium curing and the optical beam for recording or reproduction of information onto or from a BD or an HD DVD are designed to go through optical paths partly including a common optical path. In this configuration, multiple optical system configurations can be reasonably placed together into a single case. | 03-19-2009 |
20090080042 | MONOCULAR HOLOGRAPHIC DATA STORAGE SYSTEM ARCHITECTURE - A monocular holographic storage device or system to provide for compact recording and/or reading of data pages in a holographic storage medium. Also provided are methods for carrying out such data storage and/or data recovery using a monocular holographic storage device or system. Further provided are articles comprising holographic storage media for recording or for reading recorded data using such devices or systems. | 03-26-2009 |
20090080313 | Optical Information Recording and Reproducing Device - The optical information recording and reproducing device utilizing holography requires the optical system to generate the signal beam and the reference beam to be irradiated to the holographic storage medium as well as another optical system to generate the curing light beam to be irradiated to the holographic storage medium. Furthermore, from the viewpoint of backward compatibility, if the same device is used for recording or reproduction on the conventional optical discs represented by Blu-ray Disc, another optical system adaptable to recording and reproduction on these optical disks is required. This means the optical system configurations become complicated and larger in size. One solution for downsizing is to use the reference beam also as the curing light beam. Another way is sharing of optical path for curing light beam and for the reference beam. Furthermore, it is possible to share the light source for generating the curing light beam and for generating the recording or reproducing light beam. In such way, optical system configurations become simple. | 03-26-2009 |
20090086605 | Hologram Recording and Recovering Device and Holographic Recording and Recovering Method - An object of this invention is to achieve a hologram information recording and recovering device using an angle multiplexing method capable of reducing crosstalk from an adjacent hologram. When a set of incident angles of reference light on a disc in recording a hologram using the angle multiplexing method is expressed by {θ}=[θ | 04-02-2009 |
20100128591 | OPTICAL INFORMATION REPRODUCING APPARATUS, OPTICAL INFORMATION RECORDING AND REPRODUCING APPARATUS - In holographic recording by the angle multiplexing method, in order to allow a signal beam and a reference beam to sufficiently overlap with each other in a storage medium to decrease as much as possible a wastefully exposed region, which does not contribute to a signal recording, an optical pickup apparatus having a function which can control, for example, a size or a position of an aperture of the reference beam is used. An optical information reproducing apparatus or an optical information recording and reproducing apparatus using the optical pickup apparatus is used. | 05-27-2010 |
20100220570 | SIGNAL QUALITY EVALUATING APPARATUS AND METHOD, AND INFORMATION RECORDING MEDIUM - A signal quality evaluating method necessary for a signal quality evaluation index and a margin design is provided for an apparatus utilizing hologram recording techniques. An evaluation index is used being obtained by dividing root sum square of standard deviations of luminance value distribution of on- and off-pixels obtained from reproduced signals, by a difference between average values. | 09-02-2010 |
20100231998 | MONOCULAR HOLOGRAPHIC DATA STORAGE SYSTEM ARCHITECTURE - A monocular holographic storage device or system to provide for compact recording and/or reading of data pages in a holographic storage medium. Also provided are methods for carrying out such data storage and/or data recovery using a monocular holographic storage device or system. Further provided are articles including holographic storage media for recording or for reading recorded data using such devices or systems. | 09-16-2010 |
20100271921 | OPTICAL INFORMATION RECORDING MEDIUM, OPTICAL INFORMATION RECORDING/REPRODUCING DEVICE AND OPTICAL INFORMATION RECORDING/REPRODUCING METHOD - A holographic recording medium in which information can be reproduced by phase conjugate beam without requiring a mirror for obtaining the phase conjugate beam and its driving part and recording density is not reduced. The recording medium includes a recording layer in which an interference pattern is recorded and a light absorption/transmission layer which can be reversibly changed to be in a first state where signal beam and reference beam passed through the recording layer are absorbed at the time of recording of information and a second state where the reference beam is transmitted at the time of reproduction of information, and the reference beam transmitted through the light absorption/transmission layer is reflected by a reflection layer to produce the phase conjugate beam. | 10-28-2010 |
20110261671 | REPRODUCTION APPARATUS AND REPRODUCTION METHOD - In case of reproducing a hologram recorded on an optical information recording medium, adjusting beam with the amplitude distribution and phase distribution at least partially the same as those of a signal beam upon recording is radiated to the optical information recording medium which records information. The diffracting beam diffracted by the hologram is detected by a photodetector. Based on the detected information, an incident angle of the reference beam to the optical information recording medium is appropriately controlled. | 10-27-2011 |
20110273754 | HOLOGRAPHIC MEMORY DEVICE AND REPRODUCTION/RECORDING METHOD - An optical beam with the same amplitude distribution and phase distribution as those of the signal beam used for recording is radiated to the hologram recording medium via an optical system of the signal beam prior to reproduction so that the optical beam with the amplitude and phase of the reference beam upon recording is generated through diffraction. A wavefront sensor detects the wavefront configuration of the diffraction beam and obtains preliminarily the suitable wavefront of the reference beam for reproduction. The wavefront control element preliminarily corrects the wavefront of the reference beam to an optimum wavefront. | 11-10-2011 |
20110280112 | OPTICAL INFORMATION REPRODUCTION APPARATUS AND OPTICAL INFORMATION REPRODUCTION METHOD - In an optical information reproduction method for reproducing information using holography from a medium which records an interference pattern generated when overlapping a signal beam and a reference beam, the reference beam is radiated to the medium at a reference beam angle with a predetermined range for reproducing the information, a reproduction beam is generated by diffracting the reference beam with the interference pattern, the reproduction beam is detected by a photodetector; and the information is reproduced by processing a signal detected by the photodetector. | 11-17-2011 |
20120026856 | OPTICAL INFORMATION RECORD/REPRODUCTION APPARATUS AND REPRODUCTION APPARATUS - A holographic memory apparatus comprises first phase modulation means that adds phase information to each pixel of a signal beam to generate page data at recording time; oscillator light generation means that generates an oscillator light that is superimposed on, and interferes with, a diffracted light from a holographic recording medium at reproduction time; second phase modulation means that adds phase information to the oscillator light; and light detection means that detects an interference light generated by superimposing the oscillator light and the diffracted light from the holographic recording medium. | 02-02-2012 |
20120127548 | MONOCULAR HOLOGRAPHIC DATA STORAGE SYSTEM ARCHITECTURE - A monocular holographic storage device or system to provide for compact recording and/or reading of data pages in a holographic storage medium. Also provided are methods for carrying out such data storage and/or data recovery using a monocular holographic storage device or system. Further provided are articles comprising holographic storage media for recording or for reading recorded data using such devices or systems. | 05-24-2012 |
20120188618 | OPTICAL INFORMATION REPRODUCING METHOD AND OPTICAL INFORMATION REPRODUCING APPARATUS - An optical information reproducing method and apparatus using an angle-multiplex recording type holographic memory. An optical information recording medium is exposed to a reference beam, the intensity of a diffracted beam diffracted in the medium is detected by a photodetector, an error signal is generated based on a value obtained by differentiating the detected intensity of the diffracted beam based on an angle of the reference beam, so that a reference beam angle control element is subjected to a feedback control. | 07-26-2012 |