发明名称 |
Optimization Spherical Aberration to Determine Current Layer |
摘要 |
A spherical aberration correction mechanism is optimised early in the start-up process by measuring responses for various settings of the spherical aberration correction device that are removed from the initial settings of the spherical aberration correction by small amounts and comparing these responses with those anticipated for various of the multiple layers on the optical media. Signal measurements and calibrations can be performed prior to attempting to read data from the disc or concurrently with reading data from the disc. Comparing the responses with ideal, typical or anticipated curves for the various layers can derive the address of the current layer and the desired layer can be immediately accessed.
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申请公布号 |
US2008205248(A1) |
申请公布日期 |
2008.08.28 |
申请号 |
US20060994052 |
申请日期 |
2006.06.27 |
申请人 |
KONINKLIJKE PHILIPS ELECTRONICS, N.V. |
发明人 |
JANSSEN EDWIN JOHANNES MARIA;LEENKNEGT GEORGE ALOIS LEONIE |
分类号 |
G11B7/135 |
主分类号 |
G11B7/135 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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