Information recording medium apparatus for forming the same and information recording and reproducing systems

An apparatus for forming an information recording medium having a light transmitting layer and a recording layer in which at least one of information recording to and an information reproduction from said recording layer is performed by a light irradiated from a light transmitting layer side of said light transmitting layer by one of an information recording system and an information reproducing system, comprising:

• measuring means for measuring optical characteristics of said information recording medium;
• and
• recording means for previously recording measurement information measured by said measuring means into said recording layer.

An information recording system for recording information to an information recording medium which has a light transmitting layer and a recording layer and in which information regarding at least optical characteristics of said light transmitting layer has previously been recorded in said recording layer, comprising:

• reading means for optically reading the information regarding said optical characteristics recorded in said recording layer;
• and
• optical characteristics compensating means for compensating a deviation of the optical characteristics which is caused when the information is recorded to said information recording medium on the basis of the information regarding said optical characteristics read by said reading means and performing the information recording.

An information reproducing system for reproducing information from an information recording medium having a light transmitting layer and a recording layer and in which the information regarding at least optical characteristics of said light transmitting layer has previously been recorded in said recording layer, comprising:

• reading means for optically reading the information regarding said optical characteristics recorded in said recording layer;
• and
• optical characteristics compensating means for compensating a deviation of the optical characteristics which is caused when the information is reproduced from said information recording medium on the basis of the information regarding said optical characteristics read by said reading means and performing the information reproduction.