| 摘要 |
PROBLEM TO BE SOLVED: To solve the problems that, for a person with weakening eyesight and a visually-impaired person, there is the danger of mistaking a CD-ROM, a CD-R, a CD-RW, a DVD, a DVD-R or a DVD-RW for a CD, erroneously inserting it to equipment utilizing the CD, having ears damaged by a large volume and damaging a speaker and simultaneously it is difficult to identify even the front- and backside of the disk. SOLUTION: In order to identify a disk and to confirm the front surface by vision and touch as well, on the transparent part or outer side of the center part of the disk front surface, Braille or character notation is provided or one or two grooves or color-printed raised range lines are provided. On an outer shell part, notches or a undulating range shape is provided over 360 degrees. On the front surface, the recess of a press part is provided. |
