Koninklijke Philips Corporation N.V.

Thomas A J Haus

Bernardus Johannes Stinesen

Hendrik W J De Groot

Pierre Van Eijndhoven

A power supply arrangement is provided for supplying power to a plurality of back and/or edge illumination devices () in a liquid crystal display unit (), comprising a mains connection (), a power converter () and at least one inverter (). The power converter () is arranged to convert an AC voltage input to a DC voltage output, and the inverter () is connected to said DC voltage output, and arranged to convert said output to a DC voltage level adequate for driving said illumination devices (). Furthermore, the inverter () is provided with mains isolation. By virtue of this arrangement, no conventional adapter is required, and the LCD can be connected directly to the mains. The conversion down to a low DC voltage is eliminated, without violating the current-limitation safety requirements. This leads to a more effective power supply.

Inverter for liquid crystal display, and power supply arrangement comprising such an inverter

An optical scanning device scans an information track which is present on an information carrier. The scanning device includes a radiation source, a lens system with an optical axis for focusing a radiation beam supplied by the radiation source into a scanning spot on the information carrier, and a focusing actuator for displacing the lens system relatively to a basic part of the scanning device in a direction parallel to the optical axis. The actuator includes an electric coil which is arranged around the lens system and provided with a passage for a radiation beam path which extends in a direction perpendicular to the optical axis. The electric coil is provided around the lens system by means of a winding process, the passage being provided in the coil by bending the parts of the coil wires which are present near the radiation beam path, in a direction substantially parallel to the optical axis. In a preferred embodiment, said parts of the coil wires are bent during the winding process by means of a mandrel which is present in the passage during the winding process. In this manner, the optical scanning device according to the invention can be manufactured in a simple manner by means of a reduced number of process steps. The optical scanning device can be used in an optical disc player.

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Eindhoven, Netherlands

Thomas A J Haus