Optical recording medium and production method therefor

An optical recording medium, comprising a medium substrate having a main surface divided to a signal portion and a character portion wherein a signal portion uneven shape is formed on said signal portion and a character portion uneven shape is formed on said character portion, an optical recording layer formed on a formation surface of said signal portion uneven shape and character portion uneven shape, and a light transmitting protective layer formed on said optical recording layer, wherein said optical recording layer is irradiated with a light through said protective layer, wherein:

• said signal portion uneven shape and said character portion uneven shape have a continuous groove shaped uneven shape;
• wobble is formed at least on said signal portion uneven shape, and a width of a convex portion on said medium substrate is substantially constant;
• and
• characters are recorded to be able to be read as normal characters when looking from said medium substrate side by outlines of regions formed with said character portion uneven shape on said character portion.

A method of producing an optical recording medium, wherein an optical recording layer formed on a medium substrate and a light transmitting protective layer thereon are provided, and said optical recording layer is irradiated with a light through the protective layer, including the steps of:

• forming an optical recording medium producing master disk by dividing a main surface to a signal portion and a character portion, forming a signal portion uneven shape on said signal portion, and forming a character portion uneven shape on said character portion;
• forming a master stamper by transferring said signal portion uneven shape and said character portion uneven shape from said optical recording medium producing master disk;
• forming a mother stamper by transferring said signal portion uneven shape and said character portion uneven shape from said master stamper;
• forming a medium substrate by transferring said signal portion uneven shape and said character portion uneven shape from said mother stamper;
• forming an optical recording layer on a formation surface of said signal portion uneven shape and said character portion uneven shape on said medium substrate;
• and
• forming a light transmitting protective layer on said optical recording layer;
• wherein characters are recorded to be able to be read as normal characters on said optical recording medium producing master disk by outlines of regions formed with said character portion uneven shape on said character portion in said step of forming said optical recording medium producing master disk.