| 摘要 |
An optical pick-up for reading information recorded on an optical record carrier as tracks including a light source emitting a light beam, a collimator lens for converting the light beam into a parallel light beam, a swingable tracking mirror for reflecting the parallel light beam, an objective lens for projecting the light beam reflected by the tracking mirror onto the record carrier, and a plano-parallelo plate arranged rotatably between the collimator lens and the tracking mirror. The plano-parallelo plate is rotated in accordance with the rotation angle of the tracking mirror such that the light beam reflected by the record carrier propagates along the same light path as that along which the light beam is made incident upon the record carrier and any off-set in the tracking error signal can be removed.
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