SCANNING DEVICE INCLUDING AN OBJECTIVE SYSTEM FORMED OF A SINGLE MATERIAL

An optical scanning device ( 1 ) for scanning an information layer ( 4 ) of an optical record carrier ( 2 ), the device ( 1 ) comprising a radiation source ( 11 ) for generating a radiation beam ( 12, 15, 20 ) and an objective system ( 18 ) for converging the radiation beam on the information layer,...

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Bibliographische Detailangaben
Hauptverfasser:	BLOEMEN, PASCAL, J., H, HENDRIKS, BERNARDUS, H., W
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS PHYSICS
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Beschreibung
Zusammenfassung:	An optical scanning device ( 1 ) for scanning an information layer ( 4 ) of an optical record carrier ( 2 ), the device ( 1 ) comprising a radiation source ( 11 ) for generating a radiation beam ( 12, 15, 20 ) and an objective system ( 18 ) for converging the radiation beam on the information layer, the information layer being covered by a transparent layer ( 3 ) of thickness td and refractive index nd. The objective system comprises a lens formed of a single material. The lens satisfies the condition: Fomula (I), where t is the thickness of the lens, FWD is the free working distance between the lens ( 18 ) and the carrier ( 2 ), where t, td and FWD are expressed in millimeters, and where FWD+td/nd