Recording and reproducing apparatus, method of calculating temperature characteristic compensation operation coefficient, and reproducing apparatus

A method of calculating a temperature characteristic compensation operation coefficient for an adjustment value of an adjustment unit in a recording and reproducing apparatus which includes a rotary drive unit which drives an optical disc recording medium to rotate, an optical pickup unit which is configured to perform laser light radiation and reflected light detection with respect to the optical disc recording medium for data recording/reading, the adjustment unit which compensates for changes in characteristics of laser light caused by changes in temperature;

• a temperature detection unit provided to perform temperature detection of the optical pickup unit, and an evaluation value generation unit which generates an evaluation value that becomes an index of reproducing signal quality based on reflected light information obtained from the optical pickup unit, the method comprising the steps of:
• acquiring a temperature detected by the temperature detection unit as temperature information during a startup operation, corresponding to the startup operation that is performed as a preparation operation for enabling data reproducing after the optical disc recording medium is loaded;
• sequentially changing adjustment values set in the adjustment unit to different values during startup operation, searching for an optimum point of the adjustment values based on the result of acquiring an evaluation value that is generated by the evaluation value generation unit under the condition that the respective adjustment values are set, and controlling the adjustment unit to set the adjustment value as the optimum point;
• acquiring a temperature detected by the temperature detection unit as temperature information during spin down as a specified condition, which is predetermined so as to stop the rotation of the optical disc recording medium that is rotated by the rotary drive unit, which is satisfied after the startup operation is completed;
• sequentially changing the adjustment values to the different values as the specified condition is satisfied during spin down, and searching for the optimum point of the adjustment values based on the result of acquiring the evaluation value that is generated by the evaluation value generation unit under the condition that the respective adjustment values are set;
• and
• calculating a temperature characteristic compensation operation coefficient for performing temperature compensation with respect to the adjustment values based on information on the optimum point during startup operation, which is obtained by the temperature information during startup operation and the optimum point adjustment process during startup operation, and information on the optimum point during spin down, which is obtained by the temperature information during spin down and the optimum point search process during spin down.

A reproducing apparatus comprising:

• a rotary drive unit which drives an optical disc recording medium to rotate;
• an optical pickup unit which is configured to perform laser light radiation and reflected light detection with respect to the optical disc recording medium for data reading;
• an adjustment unit which compensates for changes in characteristics of the laser light caused by changes in temperature;
• a temperature detection unit provided to perform temperature detection of the optical pickup unit;
• an evaluation value generation unit which generates an evaluation value that becomes an index of reproducing signal quality based on reflected light information obtained from the optical pickup unit;
• and
• a control unit which performs
• a temperature acquisition process during a startup operation for acquiring a detected temperature detected by the temperature detection unit as temperature information during a startup operation, corresponding to the startup operation that is performed as a preparation operation for enabling data reproducing after the optical disc recording medium is loaded;
• an optimum point adjustment process during a startup operation for sequentially changing adjustment values set in the adjustment unit to different values, searching for an optimum point of the adjustment values based on the result of acquiring an evaluation value that is generated by the evaluation value generation unit under the condition that the respective adjustment values are set, and controlling the adjustment unit to set the adjustment value as the optimum point;
• a temperature acquisition process during spin down for acquiring a detected temperature detected by the temperature detection unit as temperature information during spin down as a specified condition, which is predetermined so as to stop the rotation of the optical disc recording medium that is rotated by the rotary drive unit, which is satisfied after the startup operation is completed;
• an optimum point search process during spin down for sequentially changing the adjustment values to the different values as the specified condition is satisfied, and searching for the optimum point of the adjustment values based on the result of acquiring the evaluation value that is generated by the evaluation value generation unit under the condition that the respective adjustment values are set;
• and
• a temperature characteristic compensation operation coefficient calculation process for calculating a temperature characteristic compensation operation coefficient for performing temperature compensation with respect to the adjustment values based on information on the optimum point during startup operation, which is obtained by the temperature information during startup operation and the optimum point adjustment process during startup operation, and information on the optimum point during spin down, which is obtained by the temperature information during spin down and the optimum point search process during spin down.

A method of calculating a temperature characteristic compensation operation coefficient for an adjustment value of an adjustment unit in a reproducing apparatus which includes a rotary drive unit which drives an optical disc recording medium to rotate, an optical pickup unit which is configured to perform laser light radiation and reflected light detection with respect to the optical disc recording medium for data reading, the adjustment unit which compensates for changes in characteristics of the laser light caused by changes in temperature, a temperature detection unit provided to perform temperature detection of the optical pickup unit, and an evaluation value generation unit which generates an evaluation value that becomes an index of reproducing signal quality based on reflected light information obtained from the optical pickup unit, the method comprising the steps of:

• acquiring a temperature detected by the temperature detection unit as temperature information during a startup operation, corresponding to the startup operation that is performed as a preparation operation for enabling data reproducing after the optical disc recording medium is loaded;
• sequentially changing adjustment values set in the adjustment unit to different values during startup operation, searching for an optimum point of the adjustment values based on the result of acquiring an evaluation value that is generated by the evaluation value generation unit under the condition that the respective adjustment values are set, and controlling the adjustment unit to set the adjustment value as the optimum point;
• acquiring a detected temperature detected by the temperature detection unit as temperature information during spin down as a specified condition, which is predetermined so as to stop the rotation of the optical disc recording medium that is rotated by the rotary drive unit, which is satisfied after the startup operation is completed;
• sequentially changing the adjustment values to the different values as the specified condition is satisfied during spin down, and searching for the optimum point of the adjustment values based on the result of acquiring the evaluation value that is generated by the evaluation value generation unit under the condition that the respective adjustment values are set;
• and
• calculating a temperature characteristic compensation operation coefficient for performing temperature compensation with respect to the adjustment values based on information on the optimum point during startup operation, which is obtained by the temperature information during startup operation and the optimum point adjustment process during startup operation, and information on the optimum point during spin down, which is obtained by the temperature information during spin down and the optimum point search process during spin down.