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Title:
HOLOGRAM RECORDING MEDIUM
Document Type and Number:
Japanese Patent JP2007333766
Kind Code:
A
Abstract:

To provide a hologram recording medium provided with wavelength selection films preferable for separating recording/reproduction light and servo signal light while facilitating manufacture and its management.

The hologram recording medium comprises a recording layer 60 for recording information by interference stripe of light; a servo signal layer (a reflection layer 20 reflecting irregular shape of a substrate 10 on the surface) having positioning information of recording/reproduction in the recording layer 60; and a wavelength selection layer 40 for transmitting light (servo signal light) concerning servo signals by being provided between the recording layer 60 and the servo signal layer, and reflecting light (recording/reproduction light) concerning the recording/reproduction of the recording layer 60. The wavelength selection layer 40 comprises a high refractive index layer A in which a refractive index is larger than 2.1 in a wavelength range corresponding to the recording/reproduction light and an extinction coefficient is smaller than 1.1 in a wavelength range corresponding to the servo signal light; and a laminated film for alternately laminating a low refractive index layer and the high refractive index layer B.

COPYRIGHT: (C)2008,JPO&INPIT


Inventors:
UCHIYAMA HIROSHI
Application Number:
JP2006161877A
Publication Date:
December 27, 2007
Filing Date:
June 12, 2006
Export Citation:
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Assignee:
SONY CORP
International Classes:
G03H1/02; G03H1/26; G11B7/0065; G11B7/09; G11B7/135; G11B7/24; G11B7/244
Domestic Patent References:
JP2005338340A2005-12-08
JP2006053200A2006-02-23
JP2006023602A2006-01-26
Attorney, Agent or Firm:
Chieko Tateno



 
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