US 5,673,249 A · Phase change type optical recording apparatus and optical recording method using an overwrite system

Abstract

An optical recording apparatus which records information by irradiating an optical recording medium with a light beam of a first intensity P1 for an irradiation period .tau.1 so as to form an amorphous state area in the recording medium, with a light beam of a third intensity P3 during an irradiation period .tau.3 and with a light beam of a second intensity P2 so as to form a crystal state area in the recording medium optical recording medium includes an information recording area provided for recording the recording information and a recording condition recording area provided for recording a recording condition. The recording condition recording area is provided on one of an outer circumference side and inner circumference side of the information recording area. The recording condition recording area stores recording condition data representing the intensities P1, P2, P3 (P1>P2>P3) and irradiation periods .tau.1, .tau.3 of the light beam corresponding to the radius position of the optical recording medium and satisfying the condition {(P2-P3).times..tau.3}/{(P1-P2).times..tau.1}=below unity.

Claims13

Dependent claims

An optical recording medium for recording information by irradiating the recording medium with a light beam of a first intensity P1 during a first irradiation period .tau.1, with a light beam of a third intensity P3 during a third irradiation period .tau.3 and with a light beam of a second intensity P2 under a predetermined condition, comprising:

an information recording area provided for recording the information;
and
a recording condition recording area, provided on at least one of an outer circumference side and an inner circumference side of the information recording area, for recording recording condition data, the recording condition data representing the intensities P1, P2, and P3, wherein P1>P2>P3, and irradiation periods .tau.1 and .tau.3 associated with radial positions of the optical recording medium and satisfying a condition {(P2-P3).times..tau.3}/{(P1-P2).times..tau.1}=below 1 for each radial position.

An optical recording apparatus for recording information on an optical recording medium comprising:

an light beam irradiation unit for transmitting a light beam to the recording medium;
and
a control unit that controls the light beam so as to irradiate the optical recording medium with the light beam having a first intensity P1 during a first irradiation period .tau.1 so as to form an amorphous state area at the recording medium, the light beam having a third intensity P3 during a third irradiation period .tau.3 and the light beam having a second intensity P2 so as to form a crystal state area, wherein the optical recording medium comprises:
an information recording area provided for recording the information;
and
a recording condition recording area, provided on at least one of an outer circumference side and an inner circumference side of the information recording area, for recording recording condition data, the recording condition data representing the intensities P1, P2, and P3, wherein P1>P2>P3, and irradiation intervals .tau.1 and .tau.3 associated with radial positions of the optical recording medium and satisfying a condition {(P2-P3).times..tau.3}/{(P1-P2).times..tau.1}=below 1 for each radial position.

3 more elements

Dependencies are inferred from the claim text.

Phase change type optical recording apparatus and optical recording method using an overwrite system

Life of this patent

Phase change type optical recording apparatus and optical recording method using an overwrite system

Life of this patent

Abstract

Claims13