Patent ID: 7869329
Filing Date: 2011-01-11
Classification: G11B

Abstract:
1. An optical information recording and reproducing apparatus for recording and/or reproducing information on an optical disc comprising a reference layer and a recording layer in which information can be recorded at a plurality of recording positions each of which is located at a different distance from a surface of the optical disc, the optical information recording and reproducing apparatus comprising: a light source for emitting a light flux; and an objective lens which can converge the light flux from the light source onto the reference layer and one of the plurality of recording positions at a predetermined depth in the recording layer for recording information on the optical disc, wherein when information to be recorded is recorded on one of the plurality of recording positions at a predetermined depth in the recording layer, the optical information recording and reproducing apparatus records information about the predetermined depth on one of the plurality of recording positions at the predetermined depth, with the information to be recorded.