An information recording method and information recording apparatus is
capable of resolving the trade-off relation between recording density and
transmittance, wherein either the reproduction (playback) signal quality
or the recording sensitivity is lowered. For this purpose, a voltage is
applied by way of ball bearings or slip rings to a specified layer of a
medium having multiple layers. The light transmittance of the recording
layer is changed by application of this voltage. The tradeoff
relationship between recording density and transmittance is eliminated
thereby, and the recording density and transmittance levels are both
improved, so as to enhance the recording reliability.