Patent ID: 7706233

Claim:
A method for recording as a hologram, an interference pattern due to interference of an information light and recording reference light emitted from the optical head, on an optical disk recording medium having a holographic recording layer and tracks extended along a circumferential direction at a predetermined interval in a radial direction, the method comprising the step of: recording holographic recording spots in the holographic recording layer such that a holographic recording spot on one track of the holographic recording spot on a track adjacent thereto are recorded in circumferentially different positions and, provided that the holographic recording spot has a diameter D and a present multiplex number of holographic recording spots is m, a pitch P between adjacent holographic recording spots is P=D/m; wherein the multiplex number m is a maximum multiplex number, which is determined by a reproduced light intensity of the recorded hologram; wherein the hologram is recorded in the holographic recording layer such that a spacing between a holographic recording spot recorded on one track and a holographic recording spot recorded on a track adjacent thereto is substantially P and that a holographic recording spot recording on the one track and a holographic recording spot recorded on a track distant by m tracks therefrom are deviated by P/2 in circumferential position.