Patent ID: 7808877

Claim:
An optical recording device comprising: a light source, generating a signal beam and a reference beam radiating with the same optical axis from the same direction; a light-converging optical system, converging recording light that includes the signal beam and the reference beam to at least one optical recording layer of a transmission optical recording medium; a moving unit, moving a convergence position where the recording light is converged by the light-converging optical system relative to the transmission optical recording medium, such movement being relative movement in an in-plane direction of the transmission optical recording medium as well as relative movement in the optical axis direction; a detection unit, detecting the amount of movement from a convergence position reference position in the optical axis direction; and an acquisition unit, deriving, for each of a plurality of convergence positions in the optical axis direction, a cumulative exposure amount within a plane that includes the convergence position moved by the movement amount, the derivation of the cumulative exposure amount being based on the recording sensitivity of the optical recording layer and on the movement amount of the convergence position detected by the detection unit, and apportioning the cumulative exposure amount across all the pages of in-plane recording to acquire the light exposure amount for each page, wherein interference fringes from the recording light are shift multi-recorded as a plurality of pages of holograms within a plurality of planes corresponding to the plurality of convergence positions, based on the light exposure amount of each page acquired, by the acquisition unit, for each of the convergence positions.