(EN)
Disclosed herein are a high-density recording medium, such as a high-density optical disc and a recording and/or reproducing device therefor. At a transition area of the high-density optical disc allocated between a clamping area and an information area of the high-density optical disc is formed a step having a prescribed slope so that the high-density optical disc does not collide with an objective lens of an optical pickup provided in an optical disc device although the objective lens of the optical pickup is upwardly moved toward a recording layer of the high-density optical disc until it moves to the maximum working distance when the high-density optical disc, such as a Blu-ray disc, is improperly placed on a turntable provided in the optical disc device, e.g., when the high-density optical disc is placed upside down on the turntable. The thickness of the information area is smaller than that of the clamping area by the provision of the step at the transition area. Consequently, damage to the high-density optical disc or the objective lens due to a collision of the objective lens with the high-density optical disc is prevented, and fatal errors of a servo operation are effectively prevented. Furthermore, the cost of materials required to manufacture the high-density optical disc is reduced while stable clamping force is maintained, and safe insertion of the high-density optical disc into a slot-type optical disc drive is possible.
(ZH) 此处描述的是一种高密度记录媒体(如高密度记录光盘)以及一种用于高密度记录媒体的记录和/或重现装置。在位于高密度光盘的箝位区和信息区之间的过渡层有一具有一规定斜面的台阶，使得当高密度光盘(如BD(蓝光盘))没有正确地放置在光盘装置中时，如高密度光盘被颠倒地放置在光盘装置中时，虽然物镜向着高密度光盘的记录层向上移动直到它移动到最大工作距离，该光盘也不碰撞到光盘装置中提供的光学拾取器的物镜。由于在过渡区提供了台阶，信息区的厚度小于箝位区的厚度。因此，避免了由于物镜于高密度光盘的碰撞引起的高密度光盘或物镜的损坏。另外，降低了制造高密度光盘所需的材料的成本，而保持了稳定的箝制力，且高密度光盘安全插入槽型光盘驱动器是可能的。
