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    • 3. 发明授权
    • Optical disc device, optical head, and information processing device
    • 光盘装置,光头,信息处理装置
    • US08467282B2
    • 2013-06-18
    • US12681820
    • 2009-08-03
    • Fumitomo YamasakiEishin Mori
    • Fumitomo YamasakiEishin Mori
    • G11B7/00
    • G11B7/0956G11B7/13927G11B2007/0013
    • 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: mλ/deg), an aberration amount of third-order coma aberration resulting from tilting an objective lens (8) by a unit angle is CML0 (unit: mλ/deg), a tilt angle of the multilayer optical disc (60) is θ, a coefficient is k0, and a tilt angle of the objective lens (8) by an objective lens actuator (9) is α0 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 α0 of the objective lens (8) satisfies the following mathematical expression: α0=θ×k0×CMD0/CML0, where 0.5
    • 本发明的目的是提供一种光盘装置,光学头和信息处理装置,其能够相对于具有三个或更多个具有不同透光层的信息记录表面的信息记录介质有利地记录或再现信息 彼此厚度。 假设由多层光盘(60)以单位角度倾斜而产生的三次彗形像差的像差量为CMD0(单位:mlλ/ deg),则由倾斜物镜产生的三阶彗形像差的像差量 (8)以单位角度为CML0(单位:mlambda / deg),多层光盘(60)的倾斜角为θ,系数为k0,物镜(8)的倾斜角度为目标 透镜致动器(9)在会聚激光中的α0是在多层光盘(60)的信息记录表面之外具有最大透光层厚度的信息记录表面上,物镜致动器(9)使物镜 8),使得物镜(8)的倾斜角α0满足以下数学表达式:α0=θ×k0×CMD0 / CML0,其中0.5
    • 7. 发明授权
    • Optical pick-up, optical disk apparatus and information processing apparatus
    • 光学拾取器,光盘装置和信息处理装置
    • US07508742B2
    • 2009-03-24
    • US10902680
    • 2004-07-28
    • Yoshiaki KommaEishin MoriNaoya Hotta
    • Yoshiaki KommaEishin MoriNaoya Hotta
    • G11B7/00
    • G11B7/1353G11B7/0901G11B7/0903G11B7/0906G11B7/0912G11B7/123G11B7/1275G11B7/131G11B19/125G11B31/00G11B2007/0006
    • An optical pick-up capable of reproducing information excellently on both CD and DVD, which are significantly different in terms of three kinds of factors, a base material thickness, a wavelength of a light source, and NA, and detecting TE signals by three kinds of methods, that is, the phase difference method, the PP method, and the 3-beam method, which are necessary to record and reproduce information. The optical pick-up is formed by integrating laser light sources having two kinds of wavelengths (λ1, λ2) for detecting TE signals; photodetectors, and hologram for generating the diffracted light for detecting signals. The distance d1 between the center of the photo detecting portion PD0 and the light emitting spot of the first semiconductor laser light source and a distance d2 between the center of the photo detecting portion PD0 and the light emitting spot of the second semiconductor laser light source substantially satisfy the following relationship: λ1/λ2=d1/d2.
    • 一种能够在CD和DVD上再现信息的光拾取器,其在三种因素,基材厚度,光源的波长和NA方面都有显着差异,并且检测三种TE信号 的方法,即记录和再现信息所必需的相位差方法,PP方法和3束方法。 通过对具有两种波长的激光光源(λ1,λ2)进行积分来检测TE信号,形成光学拾取器; 光电检测器和全息图,用于产生用于检测信号的衍射光。 光检测部分PD0的中心与第一半导体激光光源的发光点之间的距离d1和光检测部分PD0的中心与第二半导体激光光源的发光点之间的距离d2基本上 满足以下关系:<?in-line-formula description =“In-line Formulas”end =“lead”?> lambda1 / lambda2 = d1 / d2。 <?in-line-formula description =“In-line Formulas”end =“tail”?>