Title: Recording and reproducing apparatus
Application Number: 200610058094 Application Date: 2006.02.28
Publication Number: 1956072 Publication Date: 2007.05.02
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G11B7/0065;G11B7/125;G03H1/22
Applicant(s) Name: Fujitsu Ltd. Address:
Inventor(s) Name: Yamakage Yuzuru;Kanaoka Toshikazu;Uchida Akiyoshi;
Attorney & Agent: huanglun wei
Abstract:
    A recording and reproducing apparatus includes a light source to emit a laser beam, an information light beam irradiation unit to irradiate a medium with an information light beam, and a reference light beam irradiation unit to irradiate the medium with a reference light beam so as to form a specific speckle pattern on the medium. The reference light beam irradiation unit comprises a diffusion board provided in the way of a light path through which the laser beam is passed and generating the reference light beam, a rotation controller to rotate the diffusion board, and an identification information detector to detect identification information previously formed on a surface of the diffusion board. The diffusion board comprises a plurality of encode storage regions in which different identification information is formed and a plurality of diffusion pattern generation regions specified by the identification information. A position of the diffusion board is controlled based on the detected identification information such that a desired diffusion pattern generation region comes to a position through which the laser beam is passed while the laser beam is outputted.
Time: 5