FOCUSING CONTROLLER

PURPOSE:To prevent the frequency characteristic of a reproduced signal from being deteriorated even if the width of an annular beam spot is narrow, by forming a blind area arranged between the 1st and 2nd detecting parts of a photodetector into a polygonal shape having a prescribed positional relati...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	NODA TOYOKAZU, SHINO KUNINOBU, OOKI YUTAKA
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRIC ELEMENTS ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR ELECTRICITY INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS PHYSICS SEMICONDUCTOR DEVICES
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