Device for scanning an optically readable record carrier

A device for optically scanning an information layer on a moveable record carrier comprising:

• a radiation source,
• an objective system located between the radiation source and the record carrier for converging radiation emitted by the radiation source onto the information layer,
• a radiation-sensitive detection system arranged in the path of a radiation beam from the information layer and providing detector signals,
• a first electronic circuit for deriving a first focus error signal from high-frequency components of the detector signals, and a second focus error signal from the low-frequency components of said detector signals, and
• a second electronic circuit which receives the first and second focus error signals and comprises means for combining said first and second focus error signals so as to produce a combined focus error signal that gradually changes the relative weights of the first and second focus error signals in the combined focus error signal as a function of the distance between the objective system and the information layer on the record carrier.