发明名称 |
Optical recording and reproducing apparatus for tracking wobbling guide grooves |
摘要 |
An optical recording and reproducing apparatus uses a laser to form one or more spots on an information recording medium preformatted with wobbling guide grooves, and detects tracking error. If the differential push-pull method of detecting tracking error is used, a center spot is flanked by satellite spots distant by an odd multiple of half the repeating period of the wobble. If the three-beam method is used, the distance is an odd multiple of one-fourth the repeating period of the wobble. If the push-pull method is used, a split photodetector generates a pair of electrical signals. The sum and difference of these signals are filtered, then synchronously detected, and the result is combined with the difference signal to generate a corrected tracking error signal.
|
申请公布号 |
US5303216(A) |
申请公布日期 |
1994.04.12 |
申请号 |
US19920935925 |
申请日期 |
1992.08.27 |
申请人 |
MITSUBISHI DENKI KABUSHIKI KAISHA |
发明人 |
SHINODA, MASAHISA;KIME, KENJIRO;MATOZAKI, TOSHIYA;NAKAMURA, KEIJI;YOSHIHARA, TORU;ITO, TAKESHI |
分类号 |
G11B7/09;(IPC1-7):G11B7/09 |
主分类号 |
G11B7/09 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|