Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
October 23, 2007
Patent Application Number
08427866
Date Filed
April 26, 1995
Patent Primary Examiner
Patent abstract
In a three-dimensional recording and reproducing apparatus having a recording medium including a plurality of recording layers stacked on a substrate and an optical system for converging a light irradiated from the substrate side on each of the plurality of recording layers to three-dimensionally record and reproduce information, the following equation is satisfied:λ/4≦(1/8NB)(1/NB2−1)NAF4Δd whereλ: Wavelength of the light;NB: Refractivity of the substrate 3; NAF: Numerical aperture of a focus lens 8 for converging a light;Δd: Positional range in the optical axis direction in which exists a recording layer on which the light is to be converged.
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