| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical disk for mobiles, having such an external size and a thickness that suppresses the curving of a substrate when a light transmissive layer is formed. <P>SOLUTION: The optical disk 30 for the mobiles is provided with a substrate having ≥28 mm outside diameter and ≥0.29 mm thickness so that a deflection angle is ≤0.7°. The substrate preferably has ≥28 mm outside diameter and ≥0.323 mm thickness so that the deflection angle is ≤0.6°. The curving phenomenon can be prevented by suppressing the deflection angle to be ≤0.7° or ≤0.6°. Thereby, the disk 30 for the mobiles is utilized for an optical recording medium used for a recording and play-back device of a mobile optical recording medium and especially can be loaded on a mobile device using a small-sized recording medium of a digital camera, a mobile type music player, a PDA and the like as the ultra small size lightweight optical recording medium. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
