Method of controlling power in optical disc apparatus
A method of controlling power in an optical disc apparatus is provided. A method of controlling power in an optical disc apparatus includes: measuring a temperature of an inside of the optical disc apparatus; calculating, based on the measured temperature, a driving value with which a laser diode (LD) outputs target power; and driving the LD with the calculated driving value. The driving value uses a function in which a temperature acts as a variable and may be calculated for a read channel and a write channel in a divided manner. In the read channel, a driving value of read power in a read mode and a driving value of read power in a record mode may be calculated using different functions, and in the write channel, a driving value of at least one segment of record power divided into two or more segments may be calculated using different functions.
1. A method of controlling power in an optical disc apparatus, the method comprising:
measuring a temperature of an inside of the optical disc apparatus;
calculating, based on the measured temperature, a driving value with which a laser diode (LD) outputs target power using a function in which a temperature acts as a variable; and
driving the LD with the calculated driving value,
wherein the calculating calculates the driving value for a read channel and a write channel in a divided manner, and
wherein the calculating calculates, for the write channel, a driving value of at least one segment of record power which is divided into two or more segments using a function different from a function of another segment.
2. The method of claim 1 , wherein the function in which a temperature acts as a variable is stored at a nonvolatile memory in a production process of the optical disc apparatus.
3. The method of claim 1 , wherein the calculating calculates, for the read channel, a driving value of read power in a read mode and a driving value of read power in a record mode using different functions.
4. The method of claim 1 , wherein the calculating further comprises searching for a segment to which target record power belongs.
5. An optical disc apparatus, comprising:
an optical pickup configured to read data from an optical disc or to record data in an optical disc using output light of a Laser Diode (LD);
an optical driving unit configured to drive the LD;
a thermistor configured to measure a temperature of an inside of the optical disc apparatus;
a memory configured to store at least one function in which a temperature acts as a variable; and
a calculation unit configured to calculate a driving value with which the LD can output target power based on a temperature measured by the thermistor and to output the driving value to the optical driving unit,
wherein the calculation unit calculates driving values for a read channel and a write channel in a divided manner and calculates, for the write channel, a driving value of at least one segment of record power which is divided into two or more segments using a function different from a function of another segment.
6. The optical disc apparatus of claim 5 , wherein the calculation unit calculates, for the read channel, a driving value of read power in a read mode and a driving value of read power in a record mode using different functions.