| 摘要 |
PURPOSE: To enable recording in high density on both a groove part and a land part. CONSTITUTION: This optical disk is formed with the land part 3 and the groove part 4, and an information signal is recorded on both an area corresponding to the land part 3 and an area corresponding to the groove part 4. Then, a light quantity IL of reflected light when the land part 3 is irradiated with laser light and a light quantity IG of reflected light when the groove part 4 is irradiated with the laser light are approximately the same as each other. |
