| 摘要 |
PROBLEM TO BE SOLVED: To obtain a high density recording medium with stable characteristics by forming a recording film having equal characteristics in and between the grooves. SOLUTION: This optical information recording medium is equipped with two kinds of grooves G, L being alternately adjacent and different in depth. Since both are grooves, difference in a film thickness scarecely arises when the film is formed, making it possible to form a recording film of the same structure. In addition, the shape on both sides of the grooves are identical, thereby making recording characteristics identical between the grooves G, L. There is no need of purposely shifting the width between the grooves in order to relax the difference in the recording characteristics; therefor, the use of this substrate can improve recording density. Moreover, as the recording film can be evenly formed, stable manufacturing is possible for the optical information recording medium. |
