| 摘要 |
PROBLEM TO BE SOLVED: To provide a tilt detector capable of detecting, with high precision, the inclination of the recording face of an optical disk. SOLUTION: The tilt detector 2 for detecting the tilt of the recording face of an optical disk 1 is equipped with a light emitting means 3 for emitting a light beam to irradiate the recording face of the optical disk 1, a collimator lens 4 that parallelizes the light beam emitted by this light emitting means 3 and that emits this parallelized light beam to the recording face of the optical disk 1, a condensing lens 5 for converging the reflection light which is created by reflecting the parallelized light beam from the collimator lens 4 by the recording face of the optical disk 1, and a light receiving means 6 that receives the light beam converged by this condensing lens 5 with the light receiving plane divided into a plurality of areas and detects the center of gravity position in the intensity of the light beam received.
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