Optical information recording reproduction apparatus and optical information recording reproduction method

An optical information recording reproduction apparatus comprising:

• a first light beam source;
• a second light beam source emitting a beam with a wavelength shorter than that of the first light beam source;
• and
• an object lens condensing the beams from the first and second light beam sources to an optical information recording medium,
• wherein when information is recorded in the optical information recording medium, a recording beam is emitted from the first light beam source and a beam used to generate a signal for controlling a position of the object lens is emitted from the second light beam source, and wherein when the information of the optical information recording medium is reproduced, a reproduction beam is emitted from the second light beam source;
• an optical attenuator,
• wherein the optical attenuator adjusts a beam quantity which is supplied from the second light beam source and is incident on the optical detection unit in the recording so as to be the same as a beam quantity which is supplied from the second light beam source and is incident on the optical detection unit in the reproducing.