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发明公开
CN102084419A 光盘装置、光学头及信息处理装置 有权

光盘装置、光学头及信息处理装置
摘要：
本发明提供一种能够对具有透光层厚度各不相同的三层以上的信息记录面的信息记录媒体良好地记录或再生信息的光盘装置、光学头及信息处理装置。当将激光会聚在透光层厚度最大的信息记录面上时，设多层光盘(60)倾斜单位角度时所产生的三次彗形像差量为CMD0(mλ/deg)，物镜(8)倾斜单位角度时所产生的三次彗形像差量为CML0(mλ/deg)，多层光盘(60)的倾斜角为θ，系数为k0，基于物镜致动器(9)的物镜(8)的倾斜角为α0时，物镜致动器(9)倾斜物镜(8)使物镜(8)的倾斜角α0满足下式：α0＝θ×k0×CMD0/CML0，其中0.5＜k0＜0.9。
摘要（英）：

An object of the invention is to provide an optical disc device, an optical head, and an information processing device that enable to advantageously record or reproduce information with respect to an information recording medium having three or more information recording surfaces with light transmissive layers of different thicknesses from each other. Assuming that an aberration amount of third-order coma aberration resulting from tilting a multilayer optical disc (60) by a unit angle is CMD0 (unit: m[lambda]/deg), an aberration amount of third-order coma aberration resulting from tilting an objective lens (8) by a unit angle is CML0 (unit: m[lambda]/deg), a tilt angle of the multilayer optical disc (60) is [theta], a coefficient is k0, and a tilt angle of the objective lens (8) by an objective lens actuator (9) is [alpha]0 in converging laser light on an information recording surface having a largest light transmissive layer thickness out of the information recording surfaces of the multilayer optical disc (60), the objective lens actuator (9) tilts the objective lens (8) in such a manner that the tilt angle [alpha]0 of the objective lens (8) satisfies the following mathematical expression: [alpha]0=[theta]k0CMD0/CML0, where 0.5

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