Optical data reading device

DETAILED DESCRIPTION It is desirable to eliminate this disadvantage of the prior art and therefore it is an object of the present invention to provide an optical data reading device which is capable of keeping almost the same the angle of an optical pick-up head and a warped disk as well as their initial spacing, thereby reducing the necessary range of a focus-compensating control and simplifying the structure and reducing the size of the optical pick-up head.
According to the invention, an optical data reading device comprises means for supporting and rotating a disk; an optical pick-up head which reads data by focusing light, in use, onto a data track of the disk and detecting the light reflected from the data track; a carrier for supporting the head; means for moving the head to and fro along the carrier radially of the disk; and means for tilting the carrier about an axis extending perpendicularly to an axial plane of the disk containing the radial direction of movement of the head; whereby variation in the spacing of the head from the disk owing to warp of the disk may be at least partially compensated.
Preferably, the device further comprises a warp detector for sensing warp of the disk and providing a compensating signal, the tilting means being responsive to the compensating signal.