Recording/reproducing apparatus for optical information recording medium and optical head

摘要

A recording/reproducing apparatus for an optical information recording medium comprising an even number of recording layers provided with guide grooves for tracking formed spirally and address information, half of the recording layers having guide grooves formed in a reverse spiral direction to that of the other half, wherein the apparatus comprises an even number of optical heads provided on the same side with respect to the recording medium, positions of a pair of optical heads are set so that a total of linear velocities at their respective positions on the recording medium is almost constant when a spindle motor is rotated at a constant rotation speed, and a reference clock for a recording signal is varied according to linear velocity so that almost constant recording density can be obtained. <IMAGE>