Optical scanning apparatus for multi-layer record carrier, including focus control circuit

An optical beam in a scanning device is focused on an information layer of a multi-layer optical record carrier. A focus control circuit keeps the focal point of the beam on the information layer. When the focal point jumps to another information layer, the focus control circuit does not monitor the...

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Bibliographische Detailangaben
1. Verfasser: A. H. M. AKKERMANS
Format: Patent
Sprache:eng
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