US 2006/0221787 A1 · Method for evaluating optical recording medium, optical recording medium, and information-recording/reproducing apparatus

Abstract

The reproduction durability of an optical recording medium is evaluated highly accurately in a short period of time by providing a method for evaluating the optical recording medium, the method including determining an operating laser power for heating a recording layer to a recording operating temperature; determining a temperature of the recording layer when a laser beam having a predetermined reproducing laser power is radiated during a data reproduction; determining a relationship between the reproducing laser power during the data reproduction and a reproduction durability times at the reproducing laser power; and determining a relationship between the temperature of the recording layer during the data reproduction and the reproduction durability times from the relationship between the reproducing laser power during the data reproduction and the reproduction durability times.

Claims20

Dependent claims

A method for evaluating reproduction durability of an optical recording medium which has a recording layer and from which information is reproduced by being irradiation of a laser beam, the method comprising:

determining an operating laser power for heating the recording layer to a recording operating temperature;
determining a temperature of the recording layer when a laser beam having a predetermined reproducing laser power is radiated during a data reproduction, on the basis of an ambient temperature and the reproducing laser power during the data reproduction, and the operating laser power;
determining a relationship between the reproducing laser power during the data reproduction and a reproduction durability times at the reproducing laser power;
determining a relationship between the temperature of the recording layer during the data reproduction and the reproduction durability times, from the relationship between the reproducing laser power during the data reproduction and the reproduction durability times;
and
determining a reproduction durability times at least at one of a desired ambient temperature and a desired reproducing laser power, from the relationship between the temperature of the recording layer and the reproduction durability times at the reproducing laser power.

3 more elements

A method for evaluating reproduction durability of an optical recording medium which is provided with a recording layer and in which information is reproduced by being irradiated with a laser beam, the method comprising:

determining an operating laser power for heating the recording layer to an operating point temperature;
determining reproduction durability times at a plurality of reproducing laser powers respectively;
determining a temperature of the recording layer at each of the reproducing laser powers on the basis of each of the reproducing laser powers, an ambient temperature when the laser beam is radiated at each of the reproducing laser powers, and the operating laser power;
executing an Arrhenius plot on the basis of the temperatures of the recording layer and the reproduction durability times at the plurality of reproducing laser powers;
and
determining a reproduction durability times at least at one of a desired ambient temperature and a desired reproducing laser power, on the basis of a result of the Arrhenius plot.

3 more elements

Dependencies are inferred from the claim text.

Method for evaluating optical recording medium, optical recording medium, and information-recording/reproducing apparatus

Life of this patent

Method for evaluating optical recording medium, optical recording medium, and information-recording/reproducing apparatus

Life of this patent

Abstract

Claims20