| 摘要 |
An optical information processing apparatus is designed to generate a tracking error signal based on reflected light from a storage medium. The apparatus is a 3-beam type, in which the storage medium is irradiated by a main beam and two sub-beams offset from the main beam in the tracking direction of the storage medium. Each of the two sub-beams is, as viewed on the storage medium, smaller in size in the tracking direction than the main beam.
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