| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 369102000 | Multiplex | 7 |
| 20090168627 | METHOD OF READING OPTICAL INFORMATION AND METHOD OF RECORDING OPTICAL INFORMATION - Provided are methods of recording and reading optical information in a recording medium using holography. In the method of recording optical information, a first recording operation is performed for recording optical information in a first recording region in an overlapping manner by allowing a reference beam and a signal beam with data loaded to interfere with each other in the first recording region, the reference beam being angularly multiplexed at predetermined intervals. Furthermore, a second recording operation is performed for recording optical information in a second recording region adjacent to the first recording region in an overlapping manner by allowing the reference beam and the signal beam to interfere with each other in the second recording region, the reference beam being angularly multiplexed between the predetermined intervals. Consequently, optical information can be recorded so as to easily detect and determine a selected reproducing beam, thus increasing the reading efficiency of the optical information. | 07-02-2009 |
| 20100195473 | SIGNAL TRANSMISSION CIRCUIT AND STORAGE DEVICE - According to one embodiment, a signal transmission circuit includes: a first electro optical converter converting a read electric signal to a first optical signal having an optional wavelength λR; a first photo-electric converter configured to reconvert the first optical signal to the read electric signal; a second electro optical converter converting a electric signal to be recorded to a second optical signal having a wavelength λW different from the λR; a second photo-electric converter reconverting the second optical signal to the electric signal to be recorded; a first optical multiplexer/demultiplexer connected to the first electro optical converter and the second photo-electric converter, and multiplexing and demultiplexing the first and second optical signals; a second optical multiplexer/demultiplexer multiplexing and demultiplexing the first and second optical signals; and an optical transmission medium connected to the first and second optical multiplexers/demultiplexers, and transmits the multiplexed first and second optical signals. | 08-05-2010 |
| 20130128711 | Method and Apparatus for Multiplexing Optical Information for Recording and Reproducing Optical Information Over Optical Storage Medium - There is provided an optical multiplexer including: a substrate having a plurality of beam transmitting portions; and diffraction gratings diffracting beams irradiated to the beam transmitting portions at different angles, each diffraction grating being formed in the corresponding beam transmitting portion. | 05-23-2013 |
| 20140043952 | OPTICAL INFORMATION RECORDING/REPRODUCING APPARATUS - An optical information recording/reproducing apparatus, to apply holograms of an angle multiplex recording method therein includes: a light source to emit a light beam; a divider unit to divide the light beam into a signal beam and a reference light; an angle variable unit to change an angle of the reference light incident upon an optical information recording medium; a spatial light modulator unit to add information to the signal beam; an objective lens to irradiate the signal beam on the medium; an image pickup unit to detect a diffracted light generating from a recording region, when the reference light is irradiated on the medium; and an optical element to shape a form of light flux of the reference light, so that a light flux diameter of the reference light in a multiplex direction becomes larger than the light flux diameter of the reference light in a pitch direction. | 02-13-2014 |
| 20140071799 | OPTICAL INFORMATION RECORDING DEVICE AND METHOD - In an optical information recording device and optical information recording method for angularly multiplexing and recording data on pages on the same recording region on a hologram disk, data on each page is sequentially generated by sequentially dividing input data in predetermined units, the pages to be recorded on the same recording region are divided into page groups so that pages to be recorded adjacently by the angular multiplexing may not belong to the same group, each page group is individually subjected to inter-page coding processing for computing an error-correcting code and adding the computed error-correcting code, and data on the pages subjected to the inter-page coding processing is angularly multiplexed and recorded on the hologram disk. | 03-13-2014 |
| 20150318012 | OPTICAL INFORMATION REPRODUCTION APPARATUS AND OPTICAL INFORMATION REPRODUCTION METHOD - An optical information reproduction apparatus using holography can appropriately correct an angle and a wavelength of a reference beam in a direction perpendicular to multiplexing while data is reproduced. In the optical information reproduction apparatus which reproduces information from an optical information recording medium by using holography, an angular error signal in the direction perpendicular to multiplexing of the reference beam is generated by using a signal detected by a light detecting unit. A perpendicular angle adjustment element adjusts an angle of the reference beam in the direction perpendicular to multiplexing, based on the angular error signal. A wavelength error signal is generated from a signal detected by the light detecting unit, and a wavelength is adjusted based on the wavelength error signal. | 11-05-2015 |
| 20150364151 | OPTICAL INFORMATION RECORDING AND REPRODUCING DEVICE, OPTICAL INFORMATION RECORDING AND REPRODUCING METHOD, AND REPRODUCING DEVICE - In recording and reproducing devices that use angular-multiplexing holography, accessing a recorded hologram of interest had taken time because after positioning at the vicinity of the hologram, it had been necessary to carry out fine adjustment of the position while checking the signal quality of the hologram. The optical information recording and reproducing device according to the present invention uses angular-multiplexing to record interference patterns formed from a signal beam and a reference beam onto an optical information recording medium as page data and reproduces information from the optical information recording medium, said optical information recording and reproducing unit being provided with: a light-source unit that outputs light; an optical splitting unit that splits the light into a reference beam and a signal beam; an angle controlling unit that controls the angle for the direction of angle multiplexing at which the reference beam enters the optical information recording medium; an optical detecting unit that detects a reproduced image that is reproduced by using the reference light; and a position control unit that controls the position relationship between the reference beam and the optical information recording medium. The device treats a set of page data as a book, and during recording, at least a portion of the page data in adjacent books is recorded while the entrance angle for the direction of angular-multiplexing for the reference light is shifted by means of the angle controlling unit. During reproduction, at least a portion of the light amount of a reproduced image is detected by using the optical detecting unit, and the position of the book is detected on the basis of information about the detected light amount. | 12-17-2015 |
