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    • 1. 发明授权
    • Optical pickup and optical disc apparatus
    • 光拾取和光盘装置
    • US07800986B2
    • 2010-09-21
    • US11678395
    • 2007-02-23
    • Takashi KobayashiKatsuhiro SeoYoshiki OkamotoNoriyuki Kato
    • Takashi KobayashiKatsuhiro SeoYoshiki OkamotoNoriyuki Kato
    • G11B7/00
    • G11B7/0901G11B7/123G11B7/131G11B7/1353G11B7/1381
    • An optical pickup for recording or reproducing an information signal in an optical disc includes a light source for emitting a light beam toward the optical disc, an objective lens for focusing the light beam emitted from the light source onto a recording surface of the optical disc, and a photodetector for receiving the light beam reflected by the recording surface of the optical disc and outputting a signal corresponding to an intensity of the received light beam. A spot of the light beam received by the photodetector is asymmetric in both a radial direction and a tangential direction of the optical disc. A lens shift signal for the objective lens is detected by a controller on the basis of the signal output from the photodetector, the controller controlling the objective lens to follow the optical disc.
    • 用于在光盘中记录或再现信息信号的光学拾取器包括用于向光盘发射光束的光源,用于将从光源发射的光束聚焦到光盘的记录表面上的物镜, 以及光电检测器,用于接收由光盘的记录表面反射的光束,并输出与所接收的光束的强度对应的信号。 由光电检测器接收的光束的光点在光盘的径向和切线方向上是不对称的。 控制器根据从光电检测器输出的信号,控制物镜跟随光盘的控制器检测物镜的透镜移位信号。
    • 3. 发明申请
    • Optical disc device and optical pickup
    • 光盘设备和光学拾取器
    • US20070280085A1
    • 2007-12-06
    • US11804907
    • 2007-05-21
    • Katsuhiro SeoYoshiki OkamotoNoriyuki Kato
    • Katsuhiro SeoYoshiki OkamotoNoriyuki Kato
    • G11B7/00
    • G11B7/0903G11B7/0906G11B7/1275G11B7/1353G11B7/1381G11B2007/0006
    • An optical disc device performs tracking control using a light amount difference at two overlapping areas. The optical disc device includes a splitter, objective lens, detection-signal generator, tracking-signal generator, and driver. The splitter splits the light beam from a light source into a main beam and sub-beams. The objective lens converges the split beams and illuminates a signal-recording-layer track. The detection-signal generator receives reflected light beams and generates a detection signal according to the reflected-light-beam light amounts. The tracking-signal generator generates a tracking error signal on the basis of the detection signal. The driver drives the objective lens in a tracking direction on the basis of the tracking error signal. The splitter causes the light amounts of the overlapping areas at sub-reflected-light beams to be less than a light amount of an area other than the overlapping areas.
    • 光盘装置使用两个重叠区域的光量差进行跟踪控制。 光盘装置包括分光器,物镜,检测信号发生器,跟踪信号发生器和驱动器。 分流器将来自光源的光束分成主光束和子光束。 物镜会聚分离光束并照亮信号记录层光道。 检测信号发生器接收反射光束并根据反射光束光量产生检测信号。 跟踪信号发生器基于检测信号产生跟踪误差信号。 驱动器基于跟踪误差信号在跟踪方向上驱动物镜。 分路器使得副反射光束处的重叠区域的光量小于重叠区域以外的区域的光量。
    • 4. 发明授权
    • Optical pickup, optical recording and reproducing apparatus and tracking error signal detecting method
    • 光学拾取,光学记录和再现装置以及跟踪误差信号检测方法
    • US07684305B2
    • 2010-03-23
    • US11598579
    • 2006-11-14
    • Yoshiki OkamotoKatsuhiro Seo
    • Yoshiki OkamotoKatsuhiro Seo
    • G11B7/00
    • G11B7/131G11B7/094G11B7/0943G11B7/1353
    • An optical pickup includes an optical system in which light from a light source is introduced through an objective lens into an optical recording medium and in which light reflected from the optical recording medium is introduced into a light-receiving unit and an objective lens driving unit for driving the objective lens based on a light output detected at said light-receiving unit. In this optical pickup, a diffraction element is provided between the light source and the objective lens, the diffraction element is provided with at least first and second diffraction areas and the first and second diffraction areas have such grating shapes that ± first-order diffracted lights diffracted are received by the light-receiving unit at the position in which 0-th order light and ± first-order diffracted lights generated from guide grooves of the optical recording medium may not overlap with each other.
    • 光学拾取器包括光学系统,其中来自光源的光通过物镜被引入到光学记录介质中,并且其中从光学记录介质反射的光被引入光接收单元和物镜驱动单元 基于在所述光接收单元处检测到的光输出来驱动物镜。 在该光学拾取器中,在光源和物镜之间设置衍射元件,衍射元件设置有至少第一和第二衍射区域,并且第一和第二衍射区域具有这样的光栅形状,即±一级衍射光 衍射由光接收单元在从光记录介质的引导槽产生的0级光和±一级衍射光彼此不重叠的位置处接收。
    • 6. 发明授权
    • Optical pickup and optical disc apparatus including the same
    • 光拾取器和包括其的光盘装置
    • US07492676B2
    • 2009-02-17
    • US11859165
    • 2007-09-21
    • Yoshiki OkamotoKatsuhiro Seo
    • Yoshiki OkamotoKatsuhiro Seo
    • G11B7/00
    • G11B7/1353G11B7/1381G11B2007/0013
    • An optical pickup for recording/reproducing information on/from an optical disc having recording layers, includes a light source; an objective lens for condensing an optical beam emitted from the light source on the recording layer; a photo-detector having a light-receiving section for receiving return light from the optical disc; an optical-path separating unit for separating the optical path of the return light reflected by the optical disc from the optical path of the optical beam emitted from the light source; and a masking member having a masking unit shielding part of a passing-through optical beam, in which the masking unit shields the central region of the optical beam to be incident in the light-receiving section among the optical beams reflected by the other recording layers or surfaces different from the recording layer recording/reproducing information so as not to admit the central region to the light-receiving section.
    • 一种用于在具有记录层的光盘上记录/再现信息的光学拾取器,包括光源; 用于将从光源发射的光束聚光在记录层上的物镜; 光检测器,具有用于从光盘接收返回光的光接收部分; 光路分离单元,用于将由光盘反射的返回光的光路与从光源发射的光束的光路分离; 以及遮蔽构件,其具有通过光束的掩模单元屏蔽部分,其中所述掩蔽单元屏蔽由所述其它记录层反射的光束中的入射在所述光接收部分中的所述光束的中心区域 或与记录层记录/再现信息不同的表面,以便不将中心区域接纳到光接收部分。
    • 8. 发明申请
    • Optical pickup, optical recording and reproducing apparatus and tracking error signal detecting method
    • 光学拾取,光学记录和再现装置以及跟踪误差信号检测方法
    • US20070109930A1
    • 2007-05-17
    • US11598579
    • 2006-11-14
    • Yoshiki OkamotoKatsuhiro Seo
    • Yoshiki OkamotoKatsuhiro Seo
    • G11B7/00
    • G11B7/131G11B7/094G11B7/0943G11B7/1353
    • An optical pickup includes an optical system in which light from a light source is introduced through an objective lens into an optical recording medium and in which light reflected from the optical recording medium is introduced into a light-receiving unit and an objective lens driving unit for driving the objective lens based on a light output detected at said light-receiving unit. In this optical pickup, a diffraction element is provided between the light source and the objective lens, the diffraction element is provided with at least first and second diffraction areas and the first and second diffraction areas have such grating shapes that ±first-order diffracted lights diffracted are received by the light-receiving unit at the position in which 0-th order light and ±first-order diffracted lights generated from guide grooves of the optical recording medium may not overlap with each other.
    • 光学拾取器包括光学系统,其中来自光源的光通过物镜被引入到光学记录介质中,并且其中从光学记录介质反射的光被引入光接收单元和物镜驱动单元 基于在所述光接收单元处检测到的光输出来驱动物镜。 在该光学拾取器中,在光源和物镜之间设置衍射元件,衍射元件设置有至少第一和第二衍射区域,并且第一和第二衍射区域具有这样的光栅形状,即±一级衍射光 衍射由光接收单元在从光记录介质的引导槽产生的0级光和±一级衍射光彼此不重叠的位置处接收。