OPTICAL MODULATOR

PROBLEM TO BE SOLVED: To obtain a quick response optical modulating device for high-density recording of an optical pickup for recording and reproduction. SOLUTION: This device includes a light source (1), an optical modulator (4), and two lenses (2 and 3) between them, and the distance between thos...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	NARIHIRA ISAO, RIYUU CHIYOUKUN
Format:	Patent
Sprache:	eng
Schlagworte:	DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING FREQUENCY-CHANGING INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To obtain a quick response optical modulating device for high-density recording of an optical pickup for recording and reproduction. SOLUTION: This device includes a light source (1), an optical modulator (4), and two lenses (2 and 3) between them, and the distance between those lenses (2 and 3) is shorter than the sum of their focal lengths. The device which is optimized under those conditions can adjust the size of a light spot in the center of the optical modulator (4) by shifting only the positions of the lenses without varying the overall length from the light source (1) to the optical modulator (4). Therefore, the response time in optical modulation for high-density recording is shortened according to desired specifications to enable optimization for obtaining high light efficiency.