SCANNING DEVICE INCLUDING AN OBJECTIVE LENS FORMED OF TWO MATERIALS

An optical scanning device (1) for scanning an information layer (4) of an optical record carrier (2), the information layer (4) being covered by a transparent layer (3) of thickness td and refractive index nd. The device comprises a radiation source (11) for generating a radiation beam (12, 15, 20)...

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Bibliographische Detailangaben
Hauptverfasser:	BLOEMEN, PASCAL, J., H, HENDRIKS, BERNARDUS, H., W
Format:	Patent
Sprache:	eng ; fre
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 information layer (4) being covered by a transparent layer (3) of thickness td and refractive index nd. The device comprises 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 objective system is characterised in comprising a lens comprising a synthetic resin on a substrate, the total thickness t of the lens satisfying the condition: Formula (I), where FWD + td/nd