Method for evaluating optical recording medium, evaluation device, and evaluation system

A method for evaluating an optical recording medium having a recording layer in which a recording mark and a blank are formed by irradiation of recording laser light in the form of a pulse train with the use of at least three levels of power including a recording power, a base power, and a bias power to record information, the method comprising the steps of:

• in another optical recording medium identical to the optical recording medium being targeted for evaluation, setting the level of the base power at a room temperature recording property optimal base level being the level of the base power at which a room temperature recording property being a recording property during reproduction in a room temperature environment becomes optimum, and forming a recording mark and a blank in stages in a targeted high temperature environment with gradually increasing the level of the base power from the room temperature recording property optimal base level in order to obtain a high temperature recording property of the recording mark and the blank in each stage;
• forming a recording mark and a blank in stages in the room temperature environment with gradually increasing the level of the base power from the room temperature recording property optimal base level in order to obtain a room temperature recording property of the recording mark and the blank in each stage;
• and
• obtaining a correlation between the high temperature recording property and a parameter about the room temperature recording property in advance, and estimating a high temperature recording property of the optical recording medium being targeted for evaluation by obtaining a parameter about a room temperature recording property of the optical recording medium being targeted for evaluation to evaluate the high temperature recording property.

A device for evaluating an optical recording medium having a recording layer in which a recording mark and a blank are formed by irradiation of recording laser light in the form of a pulse train with the use of at least three levels of power including a recording power, a base power, and a bias power to record information, the device comprising:

• an input section for inputting a room temperature jitter value or a room temperature error value of the optical recording medium being targeted for evaluation;
• a memory section for storing a correlation between a high temperature jitter value or a high temperature error value and a room temperature jitter value or a room temperature error value of another optical recording medium identical to the optical recording medium being targeted for evaluation in accordance with the level of the base power of the recording laser light;
• an information processing section for estimating a high temperature jitter value or a high temperature error value of the optical recording medium being targeted for evaluation from the input room temperature jitter value or the input room temperature error value and the correlation in accordance with the level of the base power of the recording laser light;
• and
• a display section for displaying the estimated high temperature jitter value or the estimated high temperature error value.

A system for evaluating an optical recording medium having a recording layer in which a recording mark and a blank are formed by irradiation of recording laser light in the form of a pulse train with the use of at least three levels of power including a recording power, a base power, and a bias power to record information, the system comprising:

• an input device including an input section for inputting a room temperature jitter value or a room temperature error value of the optical recording medium being targeted for evaluation;
• a memory device including a memory section for storing a correlation between a high temperature jitter value or a high temperature error value and a room temperature jitter value or a room temperature error value of another optical recording medium identical to the optical recording medium being targeted for evaluation in accordance with the level of the base power of the recording laser light;
• an information processing device including an information processing section for estimating a high temperature jitter value or a high temperature error value of the optical recording medium being targeted for evaluation from the inputted room temperature jitter value or the inputted room temperature error value and the correlation in accordance with the level of the base power of the recording laser light;
• and
• a display including a display section for displaying the estimated high temperature jitter value or the estimated high temperature error value.