Tilt servo apparatus for optical disc recording/playing apparatus

A tilt servo apparatus comprising:

• photodetecting means for detecting a reflected light of a laser beam irradiated to a recording surface of an optical recording medium having a plurality of recording surfaces;
• tilt error correcting means for correcting a tilt error caused by a tilt angle that is defined between a normal at a laser beam irradiating position on said recording surface and an optical axis of said laser beam;
• driving means for driving said tilt error correcting means on the basis of an intensity of a detection signal of said photodetecting means;
• and
• control means for holding a drive value of said tilt error correcting means to a predetermined value in response to an interlayer jump command for changing the irradiating position of said laser beam from a first recording surface on said optical recording medium to a second recording surface,
• wherein said control means starts said drive value holding control in accordance with a start of the execution of said jump command, and includes memory means for storing the drive value of said tilt error correcting means before said jump command is executed, and said predetermined value is said stored drive value.

A tilt servo apparatus comprising:

• photodetecting means for detecting a reflected light of a laser beam irradiated to a recording surface of an optical recording medium;
• tilt error correcting means for correcting a tilt error caused by a tilt angle that is defined between a normal at a laser beam irradiating position on said recording surface and an optical axis of said laser beam;
• driving means for driving said tilt error correcting means on the basis of an intensity of a detection signal of said photodetecting means;
• and
• control means for holding said detection signal intensity to a predetermined intensity in response to a track jump command for changing said irradiating position of said laser beam from a first irradiating position to a second irradiating position,
• wherein said control means starts said signal intensity holding control in accordance with a start of the execution of said jump command, and includes memory means for storing said detection signal intensity before said jump command is executed, and said predetermined intensity is said stored signal intensity.

A tilt servo apparatus comprising:

• photodetecting means for detecting a reflected light of a laser beam irradiated to a recording surface of an optical recording medium having a plurality of recording surfaces;
• tilt error correcting means for correcting a tilt error caused by a tilt angle that is defined between a normal at a laser beam irradiating position on said recording surface and an optical axis of said laser beam;
• driving means for driving said tilt error correcting means on the basis of an intensity of a detection signal of said photodetecting means;
• and
• control means for holding said detection signal intensity to a predetermined intensity in response to an interlayer jump command for changing the irradiating position of said laser beam from a first recording surface on said optical recording medium to a second recording surface,
• wherein said control means includes memory means, in accordance with a start of the execution of said jump command, for storing said detection signal intensity before said jump command is executed, and said predetermined intensity is said stored signal intensity.

A tilt servo apparatus comprising:

• a photodetector which detects a reflected light of a laser beam irradiated to a recording surface of an optical recording medium;
• a tilt error correcting device which corrects a tilt error caused by a tilt angle that is defined between a normal at a laser beam irradiating position on said recording surface and an optical axis of said laser beam;
• a driver which drives said tilt error correcting device on the basis of an intensity of a detection signal of said photodetector;
• and
• a controller which holds a drive value of said tilt error correcting device to a predetermined value in response to a track jump command for changing said irradiating position of said laser beam from a first irradiating position to a second irradiating position,
• wherein said controller includes a memory device, in accordance with a start of the execution of said jump command, which stores the drive value of said tilt error correcting device before said jump command is executed, and said predetermined value is said stored drive value.

A tilt servo apparatus comprising:

• a photodetector which detects a reflected light of a laser beam irradiated to a recording surface of an optical recording medium having a plurality of recording surfaces;
• a tilt error correcting device which corrects a tilt error caused by a tilt angle that is defined between a normal at a laser beam irradiating position on said recording surface and an optical axis of said laser beam;
• a driver which drives said tilt error correcting device on the basis of an intensity of a detection signal of said photodetector;
• and
• a controller which holds a drive value of said tilt error correcting device to a predetermined value in response to an interlayer jump command for changing the irradiating position of said laser beam from a first recording surface on said optical recording medium to a second recording surface,
• wherein said controller starts said drive value holding control in accordance with a start of the execution of said jump command, and includes a memory for storing the drive value of said tilt error correcting device before said jump command is executed, and said predetermined value is said stored drive value.

A tilt servo apparatus comprising:

• a photodetector which detects a reflected light of a laser beam irradiated to a recording surface of an optical recording medium;
• a tilt error correcting device which corrects a tilt error caused by a tilt angle that is defined between a normal at a laser beam irradiating position on said recording surface and an optical axis of said laser beam;
• a driver which drives said tilt error correcting device on the basis of an intensity of a detection signal of said photodetector;
• and
• a controller which holds said detection signal intensity to a predetermined intensity in response to a track jump command for changing said irradiating position of said laser beam from a first irradiating position to a second irradiating position,
• wherein said controller starts said signal intensity holding control in accordance with a start of the execution of said jump command, and includes a memory for storing said detection signal intensity before said jump command is executed, and said predetermined intensity is said stored signal intensity.

A tilt servo apparatus comprising:

• a photodetector which detects a reflected light of a laser beam irradiated to a recording surface of an optical recording medium having a plurality of recording surfaces;
• a tilt error correcting device which corrects a tilt error caused by a tilt angle that is defined between a normal at a laser beam irradiating position on said recording surface and an optical axis of said laser beam;
• a driver which drives said tilt error correcting device on the basis of an intensity of a detection signal of said photodetector;
• and
• a controller which holds said detection signal intensity to a predetermined intensity in response to an interlayer jump command for changing the irradiating position of said laser beam from a first recording surface on said optical recording medium to a second recording surface,
• wherein said controller starts said signal intensity holding control in accordance with a start of the execution of said jump command, and includes a memory for storing said detection signal intensity before said jump command is executed, and said predetermined intensity is said stored signal intensity.