Koninklijke Philips Corporation N.v.

Coen Theodorus Hubertus Fran Liedenbaum

Bernardus Hendrikus Wilhelmus Hendriks

Stein Kuiper

Sjoerd Stallinga

Teunis Willem Tukker

Albert Hendrik Jan Immink

Andrei Mijiritskii

In an optical scanning device () capable of scanning an information plane of an optical record carrier () of different types such as BD, DVD and CD, the diameter of the radiation spot on the detector () is dependent on the numerical aperture of the objective system () that is used for scanning the record carrier An optimal design of the optical detection system for scanning a BD, result in a small radiation spot for the other types such as DVD and CD. By implementing an optical element () that increases the diameter of the radiation spot in the situation a DVD or CD is scanned, the influence of stray light is reduced and the tracking signals are improved

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Eindhoven, Netherlands

Coen Theodorus Hubertus Fran Liedenbaum