| US 7,558,176 B2 | ||
| Method for preventing optical disk from being scraped | ||
| Song-Ruei Chen, Hsin-Chu (Taiwan); Chih-Chang Cheu, Hsin-Chu (Taiwan); Rong-Son Jeng, Hsin-Chu (Taiwan); Chun-Cheng Chang, Hsin-Chu (Taiwan); and Chung-Ming Chen, Hsin-Chu (Taiwan) | ||
| Assigned to Lite-On It Corporation, Taipei (Taiwan) | ||
| Filed on Oct. 13, 2005, as Appl. No. 11/248,577. | ||
| Claims priority of application No. 93131190 A (TW), filed on Oct. 14, 2004. | ||
| Prior Publication US 2006/0083142 A1, Apr. 20, 2006 | ||
| Int. Cl. G11B 7/00 (2006.01) | ||
| U.S. Cl. 369—53.28 [369/44.27] | 14 Claims |
| 1. A method for preventing an optical disk from being scraped, comprising:
moving a pickup head of an optical read/write device to a focal position in which laser light emitted from said optical read/write
device is focused on a read/write surface of an optical disk; and
setting a vertical movement boundary in a vertical direction for said optical read/write device according to said focal position;
wherein said vertical movement boundary has an upper boundary and a bottom boundary, said vertical direction is perpendicular
to said read/write surface of said optical disk, and the process of said setting said vertical movement boundary comprises:
taking said focal position as a detection basis;
shifting a first distance L1 from said focal position upward to an upper bound point in said vertical direction; and
shifting a second distance L2 from said focal position downward to a bottom bound point in said vertical direction; and
wherein a first horizontal plane parallel with said optical disk comprising said upper bound point is said upper boundary
and a second horizontal plane parallel with said optical disk comprising said bottom bound point is said bottom boundary.
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