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1.发明公开HOLOGRAM RECORDING DEVICE, HOLOGRAM REPRODUCTION DEVICE, HOLOGRAM RECORDING METHOD, HOLOGRAM REPRODUCTION METHOD, AND HOLOGRAM RECORDING MEDIUM 审中-公开全息记录设备，全息图再现设备，全息记录方法，全息图再生方法及全息记录介质
公开(公告)号：EP1732068A4
公开(公告)日：2007-08-29
申请号：EP05727289
申请日：2005-03-25
申请人： SONY CORP
发明人： TOISHI MITSURU , OKADA HITOSHI , TANAKA TOMIJI
CPC分类号： G11B7/0065 , G03H1/28 , G11B7/00772 , G11B7/128
摘要： There is provided a hologram recording device capable of easily performing multiplex recording and reproduction to/from a hologram recording medium. The hologram recording device includes: an optical system for focusing a signal light modulated by an optical modulation element and a reference light phase-modulated by a phase modulation element substantially to the same place; and a distance control mechanism for controlling the distance between the phase modulation element and the hologram recording medium. By controlling the distance between the phase modulation element and the hologram recording medium, it is possible to perform multiplex recording to the hologram recording medium. In an ordinary phase-correlation multiplex method, multiplex recording is performed by shifting the focusing position in the surface direction of the hologram recording medium. As compared to this, the present invention can perform multiplex recording without requiring shift in the surface direction. By performing shift in the surface direction of the hologram recording medium, it is possible to further increase the recording capacity. In this case, the shift amount can have a margin as compared to the ordinary phase-correlation multiplex.
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