| 摘要 |
<p>The system has a disk (20) e.g. CD and a digital versatile disk. A pick-up head (10) reproduces information from the disk. The pickup head includes an objective lens (11), and a lens protecting device (120). The protecting device prevents foreign materials e.g. dust, from adhering to the lens. The protecting device exposes the lens when the pick-up head reproduces the information from the disk.</p> |
