Optical disk recording/reproducing device utilizing a constant angular velocity method with a constant linear velocity formatted optical disk

An optical disk recording/reproducing device, which records or reproduces information on or from an optical disk, the optical disk having pre-recorded information cyclically provided along a track so as to permit rotation control by using a constant linear velocity method for an entire region thereof, comprising:

• driving means for rotatively driving the optical disk at a constant angular velocity;
• reproducing means for reproducing information signals and the pre-recorded information from the optical disk;
• reference signal generation means for generating a reference signal for reproduction corresponding to a recording frequency of the reproduced pre-recorded information in the information signals reproduced by the reproducing means;
• and
• a reproduced signal processing circuit for extracting cyclically a reproduced signal from the reproduced information signals according to a position of said reproducing means on the optical disk in a radial direction and in accordance with said reference signal.

An optical disk recording/reproducing device, which records or reproduces information on or from an optical disk, the optical disk having pre-recorded information cyclically provided along a track so as to permit rotation control by a constant linear velocity method for an entire region thereof, comprising:

• a spindle motor for rotatively driving the optical disk at a constant angular velocity;
• an optical head for reproducing information signals and the pre-recorded information from the optical disk;
• a pre-recorded information detection circuit for extracting only the pre-recorded information from the information signals reproduced by said optical head;
• a reproduction clock generating circuit to which the extracted pre-recorded information and a reproduced signal from the optical head are inputted;
• and
• a reproduced signal processing circuit for extracting cyclically the reproduced signal in accordance with a reproduction clock signal generated by said reproduction clock generating circuit.

An optical disk recording/reproducing device, which records or reproduces information on or from an optical disk, the optical disk having pre-recorded information cyclically provided along a track so as to permit rotation control by a constant linear velocity method for an entire region thereof, comprising:

• driving means for rotatively driving the optical disk at a constant angular velocity;
• pre-recorded information reproducing means for reproducing pre-recorded information during a recording operation;
• first reference signal generation means for generating a first reference signal, said first reference signal establishing a recording frequency according to a recording frequency of the pre-recorded information reproduced by said pre-recorded information reproducing means;
• and
• recording means for performing a recording operation by using the frequency of said first reference signal generated by said first reference signal generation means as the recording frequency.

The optical disk recording/reproducing device, which records or reproduces information on or from an optical disk, the optical disk having pre-recorded information cyclically provided along a track so as to permit rotation control by a constant linear velocity method for an entire region thereof, comprising:

• a spindle motor for rotatively driving the optical disk at a constant angular velocity;
• an optical head for directing a laser beam onto the optical disk during a recording operation and for reproducing the pre-recorded information during the recording operation;
• a pre-recorded information detection circuit for extracting the pre-recorded information from information signals reproduced by said optical head;
• a clock generating circuit for generating a recording clock signal, said recording clock signal establishing a recording frequency according to a recording frequency of the pre-recorded information inputted from said pre-recorded information detection circuit;
• and
• a magnetic coil for applying a magnetic field to the optical disk during a recording operation according to said recording clock signal generated by said clock generating circuit.

A method for an optical disk recording/reproducing device which controls accessing an optical disk having pre-recorded information cyclically provided along a track thereon so as to permit rotation control by a constant linear velocity method, while providing rotation control at a constant angular velocity, comprising the steps of:

• (a) reproducing information while rotating the optical disk at a the constant angular velocity;
• (b) switching an output signal from a frequency divider to a first phase comparison circuit where pre-recorded information is inputted after having started an access operation to access a desired piece of pre-recorded information;
• (c) judging whether the access operation has been completed;
• and
• (d) switching a reproduced signal as an input signal to the first phase comparison circuit, which is reproduced by an optical head, when the access operation has been completed.

A method for an optical disk recording/reproducing device which records information at a constant angular velocity on an optical disk having pre-recorded information cyclically provided along tracks thereon so as to permit rotation control by a constant linear velocity, comprising the steps of:

• (a) rotating the optical disk at a the constant angular velocity;
• (b) extracting pre-recorded information from information signals obtained by reproducing information from the optical disk;
• (c) detecting a recording frequency of the pre-recorded information;
• (d) generating a recording clock signal from the detected recording frequency;
• and
• (e) writing information by using the recording clock signal.