HOLOGRAM RECORDING AND PLAYBACK DEVICE AND PLAYBACK POSITION DEVIATION DETECTION METHOD
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United States of America Patent
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Issued Date -
Oct 20, 2016
app pub date -
Apr 19, 2016
filing date -
Apr 19, 2016
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Abstract
A hologram recording and playback device and a playback position deviation detection method to detect the relative position deviation between the hologram and reference light during playback with high sensitivity. The hologram recording and playback device records as a servo page, signal light added with two-dimensional pattern data having a cycle induced by the spatial modulator in a least a portion of the data. During playback, reference light is emitted onto the servo page, and an optical detector mounted on the periphery of a light transmittance unit of a spatial filter detects the playback light, and detects the position deviation versus the servo page. By utilizing a check pattern for example as the two-dimensional pattern, a diffraction peak can be generated on the periphery of the light transmittance unit and position deviation can be detected with high sensitivity.
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