Optical disk apparatus, control method, control program and information storage medium

A control method of an optical disc apparatus which is capable of reading out information stored in an optical disc medium of a first type and another optical disc medium of a second type and includes

• an optical pickup radiating light having a first wavelength provided for said optical disc medium of said first type and light having a second wavelength which is smaller than said first wavelength and provided for said optical disc medium of said second type;
• and
• a signal outputting section outputting an output signal according to reflected light obtained as a result of reflection on said optical disc medium of light radiated by said optical pickup,
• said method comprising:
• requesting said optical pickup to radiate light having said first wavelength to an object optical disc medium serving as an object of type determination to acquire an output signal output by said signal outputting section while moving said optical pickup in a direction to said object optical disc medium;
• and
• determining the type of said object optical disc medium based on the number of detected peaks appearing in said acquired output signal;
• wherein said method comprises, while moving said optical pickup in a direction approaching said object optical disc medium, requesting said optical pickup to radiate light having said first wavelength to said object optical disc medium to acquire an output signal output by said signal outputting section and determining the type of optical disc medium based on comparing a peak initially appearing in said acquired output signal to a first predetermined threshold value and a second predetermined threshold value, the second predetermined threshold value being substantially greater than the first predetermined threshold value.

A microprocessor operating under the control of an executable program for controlling an optical disc apparatus which is capable of reading out information stored in an optical disc medium of a first type and another optical disc medium of a second type and includes

• an optical pickup radiating light having a first wavelength provided for said optical disc medium of said first type and light having a second wavelength which is smaller than said first wavelength and provided for said optical disc medium of said second type;
• and
• a signal outputting section outputting an output signal according to reflected light obtained as a result of reflection on said optical disc medium of light radiated by said optical pickup,
• said program for a computer comprising:
• requesting said optical pickup to radiate light having said first wavelength to an object optical disc medium serving as an object of type determination to acquire an output signal output by said signal outputting section while moving said optical pickup in a direction to said object optical disc medium;
• and
• determining the type of said object optical disc medium based on the number of detected peaks appearing in said acquired output signal;
• wherein said program comprises, while moving said optical pickup in a direction approaching said object optical disc medium, requesting said optical pickup to radiate light having said first wavelength to said object optical disc medium to acquire an output signal output by said signal outputting section and determining the type of optical disc medium based on comparing a peak initially appearing in said acquired output signal to a first predetermined threshold value and a second predetermined threshold value, the second predetermined threshold value being substantially greater than the first predetermined threshold value.

A non-transitory information storage medium which can be read by a computer and is used for storing a program for controlling an optical disc apparatus which is capable of reading out information stored in an optical disc medium of a first type and another optical disc medium of a second type and includes

• an optical pickup radiating light having a first wavelength provided for said optical disc medium of said first type and light having a second wavelength which is smaller than said first wavelength and provided for said optical disc medium of said second type;
• and
• a signal outputting section outputting an output signal according to reflected light obtained as a result of reflection on said optical disc medium of light radiated by said optical pickup,
• said program for the computer comprising:
• requesting said optical pickup to radiate light having said first wavelength to an object optical disc medium serving as an object of type determination to acquire an output signal output by said signal outputting section while moving said optical pickup in a direction to said object optical disc medium;
• and
• determining the type of said object optical disc medium based on the number of detected peaks appearing in said acquired output signal;
• wherein said program comprises, while moving said optical pickup in a direction approaching said object optical disc medium, requesting said optical pickup to radiate light having said first wavelength to said object optical disc medium to acquire an output signal output by said signal outputting section and determining the type of optical disc medium based on comparing a peak initially appearing in said acquired output signal to a first predetermined threshold value and a second predetermined threshold value, the second predetermined threshold value being substantially greater than the first predetermined threshold value.