| 摘要 |
PCT No. PCT/NO91/00006 Sec. 371 Date Sep. 9, 1992 Sec. 102(e) Date Sep. 9, 1992 PCT Filed Jan. 17, 1991 PCT Pub. No. WO91/11804 PCT Pub. Date Aug. 8, 1991.An optical data storage medium with burn-film having changeable optical properties, for example, changeable reflective power as a result of sufficiently intense illumination, due to hole-burning in the film, is provided with optical structures close to the burn-film for focusing and positioning during recording and reading of individually interpretable data bits (spots). The optical structures are preferably monodisperse, transparent spheres with a diameter in the range of 1-100 mu m. Illumination is performed selectively from a number of predetermined angles ( THETA i, phi j) during recording and reading, and the number of individual data spots under each sphere corresponds roughly to the number of angles. |
