FOCUS SERVO CIRCUIT

PURPOSE:To decrease a high area noise due to secondary resonance by forming an LPF, which has a cut-off frequency =the cut-off frequency. Then, since the high area noise is decreased and it is not necessary to narrow a servo area, a gain in a servo characteristic or a margin concerning phase rotatio...

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1. Verfasser: KIMURA HIROMASA
Format: Patent
Sprache:eng
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Zusammenfassung:PURPOSE:To decrease a high area noise due to secondary resonance by forming an LPF, which has a cut-off frequency =the cut-off frequency. Then, since the high area noise is decreased and it is not necessary to narrow a servo area, a gain in a servo characteristic or a margin concerning phase rotation can be enough secured.