Method of reading optical information and method of recording optical information
View Patent ↗In a method of recording and reading optical information in a recording medium using holography, 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.
1. A method of reading optical information, the method comprising:
performing a first reference beam irradiation operation for irradiating a reference beam at one of first multiplexing angles to a first recording region, wherein optical information is recorded in the first recording region by the reference beam that is angularly multiplexed at the first multiplexing angles, and recorded in the second recording region by the reference beam that is angularly multiplexed to a second multiplexing angles which are between the first multiplexing angles, respectively, and wherein the second recording region is located adjacent to the first recording region or partially overlapped with the first recording region; and
performing a first optical detection operation for detecting a first reproducing beam generated from the first recording region, wherein the first optical detection operation further performs detecting a second reproducing beam overlapping the first reproducing beam generated by irradiating the reference beam at the one of the first multiplexing angles to the second recording region, wherein the first optical detection operation further comprises a first optical determination operation for determining the first reproducing beam from the first and second reproducing beams overlapping each other, wherein the first optical determination operation comprises comparing light intensities of the first and second reproducing beams with each other, and determining the reproducing beam with a higher intensity between the first and second reproducing beams as the first reproducing beam, wherein the first optical detection operation further performs detecting a second reproducing beam overlapping the first reproducing beam generated by irradiating the reference beam at the one of the first multiplexing angles to the second recording region.
2. The method of claim 1 , wherein the first optical detection operation further comprises a first optical determination operation for determining the first reproducing beam from the first and second reproducing beams overlapping each other.
3. The method of claim 2 , wherein the first optical determination operation comprises comparing light intensities of the first and second reproducing beams with each other, and determining the reproducing beam with a higher intensity between the first and second reproducing beams as the first reproducing beam.
4. A method of reading optical information, the method comprising:
performing a first reference beam irradiation operation for irradiating a reference beam at one of first multiplexing angles to a first recording region, wherein optical information is recorded in the first recording region by the reference beam that is angularly multiplexed at the first multiplexing angles, and recorded in the second recording region by the reference beam that is angularly multiplexed to a second multiplexing angles which are between the first multiplexing angles, respectively, and wherein the second recording region is located adjacent to the first recording region or partially overlapped with the first recording region;
performing a first optical detection operation for detecting a first reproducing beam generated from the first recording region, wherein the first optical detection operation further performs detecting a second reproducing beam overlapping the first reproducing beam generated by irradiating the reference beam at the one of the first multiplexing angles to the second recording region, wherein the first optical detection operation further comprises a first optical determination operation for determining the first reproducing beam from the first and second reproducing beams overlapping each other, wherein the first optical determination operation comprises comparing light intensities of the first and second reproducing beams with each other, and determining the reproducing beam with a higher intensity between the first and second reproducing beams as the first reproducing beam; and
performing a second reference beam irradiation operation for irradiating the reference beam at one of the second multiplexing angles to the second recording region; and performing a second optical detection operation for detecting the second reproducing beam generated from the second recording region.
5. The method of claim 4 , wherein the second optical detection operation further performs detecting a first reproducing beam overlapping the second reproducing beam generated by irradiating the reference beam at the one of the first multiplexing angles to the first recording region.
6. The method of claim 5 , wherein the second optical detection operation further comprises a second optical determination operation for determining the second reproducing beam from the first and second reproducing beams overlapping each other.
7. The method of claim 6 , wherein the second optical determination operation comprises comparing light intensities of the first and second reproducing beams with each other, and determining the reproducing beam with a higher intensity between the first and second reproducing beams as the second reproducing beam.