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AssigneeKoninklijke Philips Electronics N.V.
InventorsBernardus Hendrikus Wilhelmus Hendriks, Johannes Joseph Hubertina Barbara Schleipen
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An optical scanning device is suitable for scanning a first information layer (23) of a first optical record carrier (21) with a first radiation beam (27) and a second information layer (47) of a second optical record carrier (45) with a second radiation beam (49). The device includes a radiation source (26) and a lens system (24). The radiation source (26) supplies the first and second radiation beams. The lens system has one optical axis (33) and operates: as a catadioptric system for the first radiation beam in order to transform this beam to a first focused radiation beam (35) having a first numerical aperture (NA1) so as to form a first scanning spot (36) in the position of the first information layer, and as a refractive system for the second radiation beam in order to transform this beam to a second focused radiation beam (52) having a second numerical aperture (NA2), different from the first numerical aperture, so as to form a second scanning spot (53) in the position of the second information layer.
An optical scanning device for scanning a first information layer (23) of a first optical record carrier (21) with a first radiation beam (27) and a second information layer (47) of a second optical record carrier (45) with a second radiation beam (49), the device including:
A lens system (24) for transforming a first radiation beam (27) to a first converging radiation beam (34) having a first numerical aperture (NA1) and a second radiation beam (49) to a second converging radiation beam (51) having a second numerical aperture (NA2) different from said first numerical aperture, the system having one optical axis (33) and including:
Dependencies are inferred from the claim text.