| 摘要 |
PROBLEM TO BE SOLVED: To improve a switch for detecting the innermost circumference by making an light beam outputted from a light-emitting element reflected by a reflection mechanism and making the light beam incident on a light receiving element when an optical pickup is positioned at the innermost circumference of an optical disk. SOLUTION: A reflection-type photo-sensor 21 is arranged on a mechanical chassis 11. An optical pickup 13 is provided with a reflection mechanism 22. The reflection-type photo-sensor 21 is constituted of an light-emitting element and a light-receiving element arranged to be plate-like. When the optical pickup 13 is positioned at the innermost circumference of an optical disk, a light beam outputted from the light-emitting element is reflected by a reflection mechanism 22 and made incident on the light-receiving element, and thus, it is detected that the optical pickup 13 is positioned at the innermost circumference of the optical disk.
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