Optical pickup device, signal processing method for optical pickup device, and optical disk drive unit

An optical pickup device which converges light emitted from a laser upon an optical disk through an objective lens and executes at least one of recording and reproduction of information on the optical disk, comprising:

• a first light detector which receives reflected light from the optical disk;
• a second light detector which receives a part of emitted light from the laser;
• an amplitude correcting means for relating in advance the amplitude of a first output signal outputted from the first light detector and the amplitude of a second output signal outputted from the second light detector at least at two measurement points which differ in the amplitude of the first output signal, and correcting the amplitude of the first output signal, using a variation in the amplitude of the second output signal when the information is reproduced;
• and
• an RF-signal detecting means for detecting an RF signal from the first output signal whose amplitude is corrected by the amplitude correcting means.

A signal processing method for an optical pickup device which converges light emitted from a laser upon an optical disk through an objective lens and executes at least one of recording and reproduction of information on the optical disk, comprising:

• a first light-receiving step of receiving reflected receiving from the optical disk with a first light detector;
• a second light-receiving step of receiving a part of emitted light from the laser with a second light detector;
• a dividing step of dividing a first output signal outputted from the first light detector by a second output signal outputted from the second light detector;
• and
• an RF-signal detecting step of detecting an RF signal from the signal obtained by a division of the dividing step.

A signal processing method for an optical pickup device which converges light emitted from a laser upon an optical disk through an objective lens and executes at least one of recording and reproduction of information on the optical disk, comprising:

• a first light-receiving step of receiving reflected receiving from the optical disk with a first light detector;
• a second light-receiving step of receiving a part of emitted light from the laser with a second light detector;
• an amplitude correcting step of relating in advance the amplitude of a first output signal outputted from the first light detector and the amplitude of a second output signal outputted from the second light detector at least at two measurement points which differ in the amplitude of the first output signal, and correcting the amplitude of the first output signal, using a variation in the amplitude of the second output signal when the information is reproduced;
• and
• an RF-signal detecting step of detecting an RF signal from the first output signal whose amplitude is corrected in the amplitude correcting step.

An optical disk drive unit, which is provided with a rotating means that rotates an optical disk, and an optical pickup device that executes at least one of recording and reproduction of information on the optical disk, wherein the optical pickup device comprises:

• a laser which emits light;
• a first light detector which receives reflected light obtained when emitted light from the laser is reflected by the optical disk;
• a second light detector which receives a part of emitted light from the laser;
• a dividing means for dividing a first output signal outputted from the first light detector by a second output signal outputted from the second light detector;
• and
• an RF-signal detecting means for detecting an RF signal from the signal obtained by a division of the dividing means.

An optical disk drive unit, which is provided with a rotating means that rotates an optical disk, and an optical pickup device that executes at least one of recording and reproduction of information on the optical disk, wherein the optical pickup device comprises:

• a laser which emits light;
• a first light detector which receives reflected light obtained when emitted light from the laser is reflected by the optical disk;
• a second light detector which receives a part of emitted light from the laser;
• an amplitude correcting means for relating in advance the amplitude of a first output signal outputted from the first light detector and the amplitude of a second output signal outputted from the second light detector at least at two measurement points which differ in the amplitude of the first output signal, and correcting the amplitude of the first output signal, using a variation in the amplitude of the second output signal when the information is reproduced;
• and
• an RF-signal detecting means for detecting an RF signal from the first output signal whose amplitude is corrected by the amplitude correcting means.