Hologram information recording medium and hologram...

G - Physics – 03 – H

Patent

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G03H 1/26 (2006.01) G11B 7/0065 (2006.01)

Patent

CA 2599249

[PROBLEMS] To provide a hologram information recording medium and a hologram information recording/reproducing device capable of accurately reproducing data multiplexed on a recording medium regardless of an affect from the external environment. [MEANS FOR SOLVING PROBLEMS] Considering expansion/contraction of a recording medium (3), multiplex parameters are modified in one recording region (31) of the recording medium (3) and a plurality of the same information groups are recorded substantially in the same region. That is, in the one recording region (31) of the recording medium (3), data groups A to D are recorded while varying a laser wavelength .lambda.. More specifically, the data groups A to D are recorded in one recording region as three groups: data group G1 having data A1, data B1, data C1, data D1; data group G2 having data A2, data B2, data C2, data D2; and data group G3 having data A3, data B3, data C3, data D3.

L~objet est de proposer un support d~enregistrement d~informations holographiques et un dispositif d~enregistrement/reproduction d~informations holographiques pouvant reproduire avec précision des données multiplexées sur un support d~enregistrement sans être affecté par les conditions extérieures. Considérant la dilatation/contraction d~un support d~enregistrement (3), les paramètres de multiplexage sont modifiés dans une zone d~enregistrement (31) du support d~enregistrement (3) et une pluralité de groupes semblables d~informations est enregistrée pour l~essentiel dans la même zone. Autrement dit, dans une zone d~enregistrement (31) du support d~enregistrement (3), les groupes de données A à D sont enregistrés en faisant varier la longueur d~onde de laser .lambda.. Plus spécifiquement, les groupes de données A à D sont enregistrés en trois groupes dans une zone d~enregistrement : le groupe de données G1 des données A1, B1, C1 et D1 ; le groupe de données G2 des données A2, B2, C2 et D2 ; et le groupe de données G3 des données A3, B3, C3 et D3.

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