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51. 发明授权

US06400666B1 Optical pickup device 失效
标题翻译：光学拾取装置
公开(公告)号：US06400666B1
公开(公告)日：2002-06-04
申请号：US09635520
申请日：2000-08-09
申请人： Jang-hoon Yoo , Kun-ho Cho , Yong-hoon Lee , Seok-jung Kim , Seung-tae Jung , Chul-woo Lee , Joong-eon Seo
发明人： Jang-hoon Yoo , Kun-ho Cho , Yong-hoon Lee , Seok-jung Kim , Seung-tae Jung , Chul-woo Lee , Joong-eon Seo
IPC分类号： G11B7095
CPC分类号： G11B7/1353 , G11B7/0956
摘要： An optical pickup device includes a light source for generating and emitting light, optical path changing means for changing a proceeding path of incident light, an objective lens for focusing incident light on a recording medium which has a recording surface where information is recorded and a protection layer, at the side where light is input, for protecting the recording surface, a main photodetector for detecting the information signal and/or an error signal by receiving the light reflected by the recording surface of the recording medium and passing through the objective lens and the optical path changing means, and an inclination detecting unit for detecting inclination of the recording medium by receiving the light emitted from the light source and reflected by the surface of the protection layer or the recording surface of the recording medium. Thus, since the inclination of the recording medium is detected using the light emitted from the light source and reflected by the surface of the protection layer or the recording surface of the recording medium, without an additional tilt sensor, the number of parts is reduced and the structure of the device is simplified.
摘要翻译：一种光拾取装置，包括用于产生和发光的光源，用于改变入射光的行进路径的光路改变装置，用于将入射光聚焦在具有记录信息的记录表面的记录介质上的物镜和保护层，在输入光的一侧用于保护记录表面;主光电检测器，用于通过接收由记录介质的记录表面反射并穿过物镜的光检测信息信号和/或误差信号;以及光路改变装置和倾斜检测单元，用于通过接收从光源发射并被保护层的表面或记录介质的记录表面反射的光来检测记录介质的倾斜度。因此，由于使用从光源发出并由保护层的表面或记录介质的记录表面反射的光来检测记录介质的倾斜度，所以没有附加的倾斜传感器，部件的数量减少，并且简化了设备的结构。

52. 发明授权

US6167004A Error signal detecting apparatus of optical pickup adopting hologram grating 有权
标题翻译：采用全息光栅的光学拾取器的误差信号检测装置
公开(公告)号：US6167004A
公开(公告)日：2000-12-26
申请号：US433296
申请日：1999-11-03
申请人： Yong-jae Lee , Tae-Kyung Kim , Pyong-yong Seong , Jang-hoon Yoo , Byung-ryul Ryoo , Yong-ki Son , Seok-jung Kim
发明人： Yong-jae Lee , Tae-Kyung Kim , Pyong-yong Seong , Jang-hoon Yoo , Byung-ryul Ryoo , Yong-ki Son , Seok-jung Kim
IPC分类号： G11B7/09 , G11B7/13 , G11B7/135 , G11B7/00
CPC分类号： G11B7/131 , G11B7/094 , G11B7/0943 , G11B7/133 , G11B7/1353
摘要： An error signal detecting apparatus for an optical pickup employing a hologram grating, including a sensing lens for focusing light reflected from a recording medium, a hologram grating having first through fourth pattern regions arranged clockwise in a 2.times.2 matrix arrangement, for diffracting light incident from the sensing lens in different directions, wherein the first through fourth pattern regions a, b, c and d are formed such that a first focus of the +1st-order diffracted beams diffracted by the first and third pattern regions is relatively farther from the sensing lens than a second focus of the +1st-order diffracted beams diffracted by the second and fourth pattern regions, a photodetector disposed between the first and second focuses and having first through fourth light receiving units, for receiving the beams diffracted by the first through fourth pattern regions and independently photoelectrically converting the same, and a signal operation unit for detecting a focus error signal and/or a track error signal from detection signals of the light receiving parts. The error signal detecting apparatus can suppress generation of an offset of a focus error signal due to a change in the wavelength of a light source and an offsets of the focus error signal and track offset signal due to deviations of the photodetector.
摘要翻译：一种用于采用全息光栅的光学拾取器的误差信号检测装置，包括用于聚焦从记录介质反射的光的感测透镜，具有以2x2矩阵排列顺时针排列的第一至第四图案区域的全息图光栅，用于衍射从感光透镜，其中第一至第四图案区域a，b，c和d被形成为使得由第一和第三图案区域衍射的+ 1级衍射光束的第一焦点相对较远离感测透镜比由第二和第四图案区域衍射的+ 1级衍射光束的第二焦点，设置在第一和第二焦点之间并具有第一至第四光接收单元的光电检测器，用于接收由第一至第四图案衍射的光束区域并独立地对其进行光电转换;以及信号操作单元，用于检测聚焦误差信号和/或来自光接收部分的检测信号的轨道误差信号。误差信号检测装置可以抑制由于光源的波长的变化引起的聚焦误差信号的偏移的产生以及由于光电检测器的偏差引起的聚焦误差信号和光道偏移信号的偏移。

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