Patent ID: 7383557

Claim:
A recording disk apparatus for recording a signal into and/or reading the signal from a recording disk, comprising: a motor for driving rotationally the recording disk, a pickup being made of a semiconductor to generate an optical power to form the signal to be recorded into the recording disk and/or to be read from the recording disk, and movable in a radial direction of the recording disk along a recording surface of the recording disk through which recording surface the signal is capable of being recorded into the recording disk and/or of being read from the recording disk, an electric element made of the semiconductor for at least one of (a) supplying an electric power to at least one of the motor or the pickup or (b) processing the signal to be recorded into the recording disk and/or the signal read from the recording disk, a first cover covering the recording surface of the recording disk and the pickup in such a manner that the pickup is arranged between the recording surface and the first cover in a thickness direction of the recording disk, and a second cover covering a reverse surface of the recording disk opposite to the recording surface of the recording disk in the thickness direction of the recording disk, wherein the pickup and the electric element are prevented from overlapping each other as seen in the thickness direction of the recording disk to restrain a thermal conduction between the pickup and the electric element so that a thermal conduction restraining area extending along an imaginary directional line crossing an imaginary straight line passing the pickup and the electric element as seen in the thickness direction is formed between the pickup and the electric element as seen in the thickness direction, the first cover having at least one oblong hole elongated along the imaginary directional line to facilitate a restraint of thermal conduction through the first cover at the thermal conduction restraining area between the pickup and the electric element.