| 摘要 |
Provided is an optical information recording and reproducing apparatus for recording and reproducing information using holography by irradiating a spatial modulator with a light beam from a first laser light source, separately generating information light and reference light sharing an optical axis, and condensing the generated light beam onto the information recording medium by an objective lens including a driving unit for moving the objective lens, in which the driving unit moves the objective lens in parallel to the light beam in accordance with the incident angle of light passing through the center of the spatially modulated light beam with respect to the information recording medium. The apparatus enables a stable recording and reproduction performance operation even in the case where a relative tilt occurs between an information recording medium and an optical pickup without enlarging an apparatus.
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