Patent ID: 7719940

Claim:
A tilt correcting apparatus for tilt correction in an information recording apparatus or an information recording/reproducing apparatus capable of recording information onto an information recording medium, on an information recording surface of which a track having a wobble is formed, by emitting laser light thereonto, said tilt correcting apparatus comprising: a correcting device for changing an irradiation angle of the laser light with respect to the information recording medium; a controlling device for controlling said correcting device such that the irradiation angle is set to be each of a plurality of predetermined angles before the information recording apparatus or the information recording/reproducing apparatus records information; a wobble detecting device for detecting a wobble signal corresponding to wobble from a photo-detection signal of light from the track caused by the laser light in such a condition that the irradiation angle is set to be each of the plurality of predetermined angles; an RF detecting device for detecting an RF signal corresponding to recorded information from a photo-detection signal; and a tilt determining device for determining an amount of tilt of the information recording surface with respect to the laser light, on the basis of the detected wobble signal and on an offset obtained as a difference between an amount of tilt for maximum amplitude of the RF signal and an amount of tilt for maximum amplitude of the wobble signal, said controlling device controlling said correcting device to correct the irradiation angle in accordance with the amount of tilt determined by said tilt determining device when the information recording apparatus or the information recording/reproducing apparatus records information, said controlling device controlling said correcting device in accordance with the amount of tilt, in consideration of the offset.