| Patent Number |
Title Of Patent |
Date Issued |
| 7206106 |
Holographic ROM reader having servo control |
April 17, 2007 |
| A holographic ROM reader having a servo control is disclosed. The holographic ROM reader includes an objective lens for focusing light reflected from a storage medium, a pinhole plate provided with a pinhole, a diffraction grating, embedded into the pinhole of the pinhole plate, for |
| 7193953 |
Holographic recording and reconstructing apparatus and mask for use therein |
March 20, 2007 |
| In a holographic recording apparatus having a hologram medium for storing an interference pattern between a reference beam and a modulated signal beam, a double-layered mask for modulating a signal beam with data to generate the modulated signal beam has a first and a second opaque film |
| 7190656 |
Apparatus and method for controlling tracking and focusing servo in a holographic digital data s |
March 13, 2007 |
| A holographic storage system includes a beam supplying unit for supplying an incident beam including data read from a plurality of tracks on a holographic medium; a transferring unit for receiving the incident beam and producing a focused beam; a tracking servo unit for receiving a first |
| 7158274 |
Pick-up apparatus for digital storage medium |
January 2, 2007 |
| In order to pick up a digital storage medium including a holographic storage medium and a reflective storage medium, a first and a second beam each of which has a different wavelength are used and a reflected beam and a reconstructed signal beam are propagated through a propagation p |
| 7081977 |
Angular multiplexing apparatus for holographic storage medium |
July 25, 2006 |
| An angular multiplexing apparatus for a holographic storage medium. The angular multiplexing apparatus includes a reconstructing reference beam generator, translated in parallel to a number of positions, for generating a number of reconstructing reference beams which propagate in par |
| 7027196 |
Tilt servo apparatus for use in ROM system |
April 11, 2006 |
| A tilt servo apparatus for use in a ROM system includes means for generating a reconstructing beam to be projected onto a digital storage medium to generate a reflected beam; a holographic plate for storing a first and a second hologram and diffracting the reflected beam with the fir |
| 6958805 |
Apparatus and method for aligning holographic ROM system |
October 25, 2005 |
| Before recording data included in a data mask on a holographic medium, the data mask and the holographic medium are aligned by an aligner, which includes a beam supplying unit for supplying an incident laser beam; a transferring unit for receiving the incident laser beam and producing a |
| 6850346 |
Method and apparatus for storing and retrieving a sequence of digital page data |
February 1, 2005 |
| In a storing mode of an apparatus for storing and retrieving a sequence of digital page data, a first/second complex reference beam and a modulated signal beam converge on a storing location to generate a sequence of first/second interference patterns to be sequentially stored on a h |
| 6844949 |
Method and apparatus for storing and retrieving digital page data |
January 18, 2005 |
| In a storing mode of an apparatus for sequentially storing and retrieving digital page data, a first and second complex reference beams and a modulated and second signal beams converge on a first/second location to generate a sequence of first and second interference patterns to be s |
| 6346897 |
N:N+1 channel coding method and apparatus therefor |
February 12, 2002 |
| A method for mapping 2.sup.N message N-tuples into 2.sup.N+1 codeword (N+1)-tuples is developed. The 2.sup.N+1 codeword (N+1)-tuples are categorized into M subsets of codeword (N+1)-tuples, wherein M is an integer larger than 1, each subset G has N.sub.G codeword (N+1)-tuples and the |
