| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical disk recording medium to and from which holograms can be continuously recorded and reproduced at ultra-high density. SOLUTION: In recording the holograms in hologram recording regions 7, hologram recording spots HSP to be recorded on one track of the regions 7 and hologram recording spots HSP to be recorded on a track adjacent thereto are recorded in positions different in a circumferential direction. At least one hologram recording spot HSP is recorded in the respective tracks and the process is made continuous. When a diameter of the hologram recording spot HSP is defined as D and the multiple number of the adjacent hologram recording spots HSP as (m), these recording spots are so recorded that the pitch P between the recording spots HSP attains P=D/m. The holograms can therefore be efficiently recorded in the recording regions 7 of the optical disk recording medium 1 at the high density and the higher density of the hologram recording capacity can be attained. COPYRIGHT: (C)2003,JPO
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