Optical information recording medium and method for manufacturing the same

A method for manufacturing an optical information recording medium, the method comprising the steps of:

• dropping and spreading a first photosensitive polymer on a first optically transparent substrate in a first spreading step, the first photosensitive polymer containing a first organic coloring matter;
• dropping and spreading a second photosensitive polymer on a second optically transparent substrate in a second spreading step, the second photosensitive polymer containing a second organic coloring matter;
• forming a recording layer by bonding the first optically transparent substrate on which the first photosensitive polymer is spread in the first spreading step and the second optically transparent substrate on which the second photosensitive polymer is spread in the second spreading step such that surfaces on which the photosensitive polymers are spread face each other in a recording layer formation step;
• awaiting concentration diffusion of the first and second organic coloring matters that occurs at an interface between the first photosensitive polymer and the second photosensitive polymer bonded in the recording layer formation step such that an absorptivity of light for information recording increases in proportion to a depth from a side of the recording layer to which the light for information recording is incident to permit information to be recorded at shallow and deep positions in the recording layer at substantially equal conditions in a concentration diffusion awaiting step;
• and
• curing the recording layer in which the concentration diffusion has occurred in the concentration diffusion awaiting step.