Patent ID: 7522498

Claim:
An optical information recording apparatus which records a first information signal on an optical information recording medium by carrying out an on/off modulation of a laser beam source at a period of integer multiples of a predetermined basic period in accordance with a data to be recorded, and which records a change from a predetermined light intensity level to other light intensity level, which is obtained from a micro equal interval step such that an inclination of the light intensity becomes substantially linear with respect to a second information signal and time by changing a light intensity of the laser beam source, on the optical information recording medium, comprising: measuring means for measuring a laser intensity of the modulated laser beam; control means for controlling a driving signal of the modulated laser beam; characteristic measuring means for measuring a characteristic of laser beam intensity with respect to a predetermined pair of amplitudes of the driving signal obtained by the measuring means and the control means; characteristic inverting means for carrying out an invert operation of the characteristic so as to determine a driving amplitude corresponding to a certain light intensity, and storing the result; and timing correcting means for correcting a timing of the modulated signal in accordance with a light intensity level of the laser beam, wherein in the characteristic inverting means storing a driving amplitude for making a desired light intensity output, the light intensity of the laser beam is directly controlled during a change by investigating a necessary driving amplitude, and the resultant regenerative signal of the optical information recording medium being smoothly variable in a recording range where a recording light intensity changes so that the optical information recording medium can be safely reproduced.