| 摘要 |
<p>In order to produce an optical data carrier (1) with a visible image (7) in its data bearing portion, a proportion of the data pits (8b, 8d) are reduced in depth. Under normal circumstances, the reduction in depth is limited because excessive jitter is introduced in the signal read from such a carrier. To solve this problem, a writing beam is modulated so as to extend the shallower pits or to ensure that the lead-in and lead-out slopes of the shallower pits are the same as those of the deeper pits.</p> |
