| 摘要 |
A method and an apparatus correctly detect a reproducing signal of an optical disk with a high margin. An optical spot is emitted to an optical disk, and information recorded on the optical disk is reproduced based on the optical output by detecting a light transmitted or reflected by the optical disk. Information can be reproduced by a sum signal obtained by adding up optical outputs from the first set of two optical detectors A and B positioned opposite each other in the proceeding direction of the optical spot on the optical disk.
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