Patent ID: 8000205

Claim:
A recording apparatus for performing recording on a hologram recording medium on which data is recorded using a moire generated by interference between reference light and signal light, the hologram recording medium including: (a) a data recording layer on which data is recorded using a moiré; and (b) a position information recording layer having formed thereon tracks in which at least address information for indicating a physical position on the data recording layer is recorded, wherein a plurality of tracks on the position information recording layer are formed in such a manner as to be arranged in one plane direction of the hologram recording medium, the recording apparatus comprising: a processor; a first light source operatively coupled to the processor, the first light source being configured to output first laser light having a first wavelength; a second light source operatively coupled to the processor, the second light source being configured to output second laser light having a second wavelength differing from the first wavelength; a recorder operatively coupled to the processor; and a memory device storing instructions which when executed by the processor, cause the processor, in cooperation with the first light source, the second light source, the recorder and the memory device, to: (a) record units of hologram pages on the data recording layer of the hologram recording medium in such a manner that: (i) a recording data sequence is converted into a data pattern in units of hologram pages; (ii) the signal light is generated by performing space light modulation on the first laser light based on the data pattern; (iii) the reference light is generated based on the first laser light; and (iv) the signal light and the reference light are irradiated to the hologram recording medium; (b) irradiate the hologram recording medium with the second laser light in such a manner that the light axis of the second laser light matches the light axis of the irradiated first laser light; (c) detect reflected light from the position information recording layer; (d) based on a reflected light signal obtained by the detected reflected light perform position control so that a determined data recording position is on the track; (e) for each of a designated number of tracks arranged in the one plane direction, set a different data recording target section such that each length of the different data recording sections are equal, each different data recording target section extending over each of the designated number of tracks; and (f) perform control on the recorder in such a manner that a series of data to be recorded is recorded in a region that: (i) includes the set data recording target sections; (ii) extends over the designated number of tracks arranged in the one plane direction; and (iii) is a portion in the direction in which the designated number of tracks are formed on the hologram recording meduim.