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1. 发明授权

US06584057B1 Optical pickup system 失效
标题翻译：光学拾取系统
公开(公告)号：US06584057B1
公开(公告)日：2003-06-24
申请号：US09397874
申请日：1999-09-17
申请人： Yoshitsugu Araki , Noriaki Murao
发明人： Yoshitsugu Araki , Noriaki Murao
IPC分类号： G11B700
CPC分类号： G11B7/13927 , G11B7/0948 , G11B7/1275 , G11B7/1369 , G11B7/139 , G11B2007/0006
摘要： An optical pickup system includes a light source, an objective lens, a beam splitter for splitting light received from the light source and reflected light from an optical disc, a detector for receiving the reflected light, a liquid crystal panel for providing passing light with a phase difference in accordance with a control signal and a control means for providing the control signal to the liquid crystal panel to eliminate an influence of birefringence of the optical disc.
摘要翻译：一种光学拾取系统，包括光源，物镜，用于分离从光源接收的光的分束器和来自光盘的反射光，用于接收反射光的检测器，用于将通过的光与根据控制信号的相位差和用于向液晶面板提供控制信号以消除光盘双折射影响的控制装置。

2. 发明授权

US06388967B2 Liquid crystal driving signal generating apparatus and optical disk reproducing apparatus with liquid crystal driving signal generating apparatus 失效
标题翻译：具有液晶驱动信号发生装置的液晶驱动信号发生装置和光盘再现装置
公开(公告)号：US06388967B2
公开(公告)日：2002-05-14
申请号：US09055703
申请日：1998-04-07
申请人： Junichi Furukawa , Kiyoshi Tateishi , Noriaki Murao , Hiroaki Abe
发明人： Junichi Furukawa , Kiyoshi Tateishi , Noriaki Murao , Hiroaki Abe
IPC分类号： G11B7135
CPC分类号： G11B7/13927 , G11B7/0956 , G11B7/1369
摘要： A liquid crystal driving signal generating apparatus comprises a PWM signal generator, a low pass filter for limiting a frequency band of a PWM signal outputted from the PWM signal generator, a liquid crystal panel connected to an output of the low pass filter, and a control means for controlling the PWM signal generator. The control means controls the PWM signal generator such that the PWM signal generator generates a PWM signal with a duty ratio corresponding to a refractive index to be set in the liquid crystal panel.
摘要翻译：液晶驱动信号发生装置包括PWM信号发生器，用于限制从PWM信号发生器输出的PWM信号的频带的低通滤波器，连接到低通滤波器的输出的液晶面板，以及控制用于控制PWM信号发生器的装置。控制装置控制PWM信号发生器，使得PWM信号发生器产生一个与在液晶面板中设置的折射率对应的占空比的PWM信号。

3. 发明授权

US5687146A Focus control device for use with an optical pickup comprising a refracting means 失效
$Focus control device for use with an optical pickup comprising a refracting means$
标题翻译：用于包括折射装置的光学拾取器的聚焦控制装置
公开(公告)号：US5687146A
公开(公告)日：1997-11-11
申请号：US229442
申请日：1994-04-13
申请人： Noriaki Murao , Takanori Maeda
发明人： Noriaki Murao , Takanori Maeda
IPC分类号： G11B7/095 , G11B7/09 , G11B7/135 , G11B7/00
CPC分类号： G11B7/127 , G11B7/0912 , G11B7/13 , G11B7/1365 , G11B7/1367
摘要： An optical pickup for reading information recorded on a recording surface of an optical information storage medium such as a compact disc or a laser video disc has a light beam source for emitting a linear light beam, and an optical system including an objective lens for converging the linear light beam as a linear image on the recording surface and collecting and emitting a light beam reflected from the recording surface. A focus control device includes a parallel flat glass plate for refracting the reflected light beam from the optical system, a photodetector having a plurality of photosensitive surfaces for photoelectrically converting the light beam applied thereto from the parallel flat glass plate into a plurality of respective detected signals, an error signal generator for processing the detected signals from the photodetector into a focus error signal indicative of whether the linear image is focused on the recording surface at the focal point of the objective lens, and an actuator responsive to the focus error signal for controlling the objective lens positionally with respect to the optical information storage medium to focus the linear image on the recording surface.
摘要翻译：用于读取记录在诸如光盘或激光视盘之类的光学信息存储介质的记录表面上的信息的光学拾取器具有用于发射线性光束的光束源，以及包括物镜的光学系统，用于会聚线性光束作为记录表面上的线性图像并且收集和发射从记录表面反射的光束。聚焦控制装置包括用于折射来自光学系统的反射光束的平行平板玻璃板，具有多个感光表面的光电检测器，用于将从平行平板玻璃板施加到其上的光束光电转换成多个检测信号误差信号发生器，用于将来自光电检测器的检测信号处理成指示该线性图像是聚焦在物镜焦点处的记录表面上的聚焦误差信号;以及响应于聚焦误差信号的致动器，用于控制物镜相对于光学信息存储介质位置地将线性图像聚焦在记录表面上。

4. 发明授权

US5379288A Optical information recording medium and a reproducing apparatus for the recording medium 失效
标题翻译：光学信息记录介质和用于记录介质的再现装置
公开(公告)号：US5379288A
公开(公告)日：1995-01-03
申请号：US25644
申请日：1993-03-03
申请人： Takanori Maeda , Noriaki Murao
发明人： Takanori Maeda , Noriaki Murao
IPC分类号： G11B7/00 , G11B7/004 , G11B7/0045 , G11B7/005 , G11B7/007 , G11B7/013 , G11B7/13 , G11B20/10 , G11B7/26 , G11B11/18
CPC分类号： G11B7/24085 , G11B20/10009 , G11B7/0045 , G11B7/005 , G11B7/13
摘要： An optical information recording medium, to and from which information can be recorded or reproduced at a high density, uses more number of kinds of pits than those of a conventional optical disc. A reproducing apparatus for such a medium also is devised. Information is recorded onto the recording medium by using a plurality of pit lengths which are obtained by dividing a whole frequency band below a cut-off frequency of MTF characteristic of a reproducing system into a plurality of bands in correspondence to the band characteristic and by allocating a plurality of spatial frequencies to the divided bands. The reproducing apparatus of the invention comprises an optical pickup to read out the recording information from the optical recording medium and signal demodulating means for demodulating the original data from the pulse width and amplitude value of the reproduction signal which is supplied from the optical pickup, wherein the optical pickup is designed to have an MTF characteristic such as to have one or a plurality of peaks at certain frequency positions.
摘要翻译：可以以高密度记录或再现信息的光学信息记录介质使用比常规光盘更多数量的凹坑。还设计了这种介质的再现装置。信息通过使用通过将再现系统的MTF特性的截止频率以下的整个频带划分成与频带特性相对应的多个频带而获得的多个凹坑长度并通过分配来记录在记录介质上对分割频带的多个空间频率。本发明的再现装置包括一个光拾取器，用于从光学记录介质读出记录信息和信号解调装置，用于根据从光学拾取器提供的再现信号的脉冲宽度和振幅值对原始数据进行解调，其中光学拾取器被设计为具有MTF特性，例如在某些频率位置具有一个或多个峰值。

5. 发明授权

US5302834A Optical pickup and tilt control device including a plurality of photosensitive units for generating signals indicating whether tilt correction is necessary 失效
标题翻译：光拾取和倾斜控制装置包括多个感光单元，用于产生指示是否需要倾斜校正的信号
公开(公告)号：US5302834A
公开(公告)日：1994-04-12
申请号：US974629
申请日：1992-11-12
申请人： Noriaki Murao
发明人： Noriaki Murao
IPC分类号： G11B7/095 , G11B7/13 , G11B7/00
CPC分类号： G11B7/0956 , G11B7/13
摘要： An optical pickup for reading information recorded on a recording surface of an optical information storage medium has a light beam source for emitting a linear light beam, and an optical system including an objective lens for converging the linear light beam as a linear image on the recording surface and collecting and emitting a light beam reflected from the recording surface. A tilt control device includes a parallel flat glass plate for refracting the reflected light beam from the optical system, a plurality of photodetector units each having a plurality of photosensitive surfaces for photoelectrically converting the light beam applied thereto from the parallel flat glass plate into a plurality of respective detected signals, an error generator for processing the detected signals from the photodetector units into a tilt error signal indicative of whether the linear light beam is applied perpendicularly to the recording surface, and an actuator responsive to the tilt error signal for controlling the objective lens positionally with respect to the optical information storage medium to apply the linear light beam perpendicularly to the recording surface.
摘要翻译：用于读取记录在光学信息存储介质的记录表面上的信息的光学拾取器具有用于发射线性光束的光束源，以及包括用于将线性光束作为线性图像会聚在记录上的物镜的光学系统表面并收集并发射从记录表面反射的光束。倾斜控制装置包括用于折射来自光学系统的反射光束的平行平板玻璃板，多个光电检测器单元，每个光电检测器单元具有多个感光表面，用于将从平行平板玻璃板施加到其上的光束光电转换成多个的误差发生器，用于将来自光电检测器单元的检测信号处理成指示垂直于记录表面施加线性光束的倾斜误差信号的误差发生器，以及响应于用于控制目标的倾斜误差信号的致动器在相对于光学信息存储介质的位置上的透镜，以垂直于记录表面施加线性光束。

6. 发明授权

US5420847A Reproducing system for an optical disc 失效
标题翻译：用于光盘的再现系统
公开(公告)号：US5420847A
公开(公告)日：1995-05-30
申请号：US69850
申请日：1993-06-01
申请人： Takanori Maeda , Toru Akiyama , Fumitaka Kotaka , Noriaki Murao
发明人： Takanori Maeda , Toru Akiyama , Fumitaka Kotaka , Noriaki Murao
IPC分类号： G11B7/085 , G11B7/09 , G11B7/095 , G11B7/14 , G11B7/20
CPC分类号： G11B7/14
摘要： A plurality of tracks are spirally arranged in a group on an optical disc. The tracks in the group are simultaneously radiated by laser beams. Adjacent tracks in the group are disposed at a radial distance d1, and adjacent spots of the laser beams on the tracks are disposed at a radial distance ds which is smaller than the distance d1.
摘要翻译：多个轨道被螺旋地布置在光盘上的组中。组中的轨道被激光束同时辐射。组中的相邻轨道设置在径向距离d1处，并且轨道上的激光束的相邻点设置在比距离d1小的径向距离ds处。

7. 发明授权

US5303221A Optical pickup for an optical disc reproducing system 失效
标题翻译：用于光盘再现系统的光拾取器
公开(公告)号：US5303221A
公开(公告)日：1994-04-12
申请号：US72941
申请日：1993-06-08
申请人： Takanori Maeda , Noriaki Murao
发明人： Takanori Maeda , Noriaki Murao
IPC分类号： G11B7/00 , G11B7/135 , G11B7/08
CPC分类号： G11B7/1353 , G11B2007/0006
摘要： An optical pickup has a light source for generating a first light having a longer wavelength and a second light having a shorter wavelength, an objective, and a phase hologram disposed between the light source and the objective. The objective is designed to have a larger spherical aberration for the first light than a spherical aberration for the second light. The phase hologram is arranged to give a phase difference of an integer multiple of 2.pi. for the second light. The phase hologram is further arranged so that a spherical aberration given to the first light has an opposite polarity to the polarity of the spherical aberration given by the objective.
摘要翻译：光拾取器具有用于产生具有较长波长的第一光和具有较短波长的第二光，物镜和设置在光源与物镜之间的相位全息图的光源。该目的被设计为对于第一光具有比用于第二光的球面像差更大的球面像差。相位全息图被布置成给出第二光的2（pi）的整数倍的相位差。相位全息图被进一步布置成使得给予第一光的球面像差与由物镜给出的球面像差的极性具有相反的极性。

8. 发明授权

US06449095B1 Optical pickup 失效
标题翻译：光学拾音
公开(公告)号：US06449095B1
公开(公告)日：2002-09-10
申请号：US09665075
申请日：2000-09-19
申请人： Sakashi Ohtaki , Noriaki Murao
发明人： Sakashi Ohtaki , Noriaki Murao
IPC分类号： G02B2744
CPC分类号： G11B7/1353 , G02B5/1876 , G11B7/127 , G11B2007/0006
摘要： An optical pickup is disclosed which includes a first light source for emitting a first beam of light with a first wavelength; a second light source for emitting a second beam of light with a second wavelength, longer than the first wavelength; a condenser lens for condensing the first and second beam of light onto an information recording surface of a recording medium; and a diffractive optical element arranged in an optical path from the first and second light source to the condenser lens. The condenser lens condenses, for the first beam of light, a refracted beam of the first diffraction order of the first beam of light by means of the diffractive optical element as an information read beam or an information write beam. For the second beam of light, the condenser lens condenses a refracted beam of the second diffraction order, lower than the first diffraction order, of the second beam of light by means of the diffractive optical element as an information read beam or an information write beam.
摘要翻译：公开了一种光学头，其包括用于发射具有第一波长的第一光束的第一光源; 第二光源，用于发射长于第一波长的第二波长的第二光束; 聚光透镜，用于将第一和第二光束聚光到记录介质的信息记录表面上; 以及衍射光学元件，其设置在从第一和第二光源到聚光透镜的光路中。对于第一光束，聚光透镜通过作为信息读取光束或信息写入光束的衍射光学元件将第一光束的第一衍射级的折射光束冷凝。对于第二光束，聚光透镜通过作为信息读取光束或信息写入光束的衍射光学元件将第二光束的第二衍射级的折射光束比第一衍射级别低。

9. 发明授权

US06078556A System for producing a liquid crystal driving signal 失效
标题翻译：用于产生液晶驱动信号的系统
公开(公告)号：US06078556A
公开(公告)日：2000-06-20
申请号：US84354
申请日：1998-05-27
申请人： Junichi Furukawa , Kiyoshi Tateishi , Noriaki Murao
发明人： Junichi Furukawa , Kiyoshi Tateishi , Noriaki Murao
IPC分类号： G11B7/09 , G11B7/00 , G11B7/135
CPC分类号： G11B7/13927 , G11B7/0956 , G11B7/1369
摘要： A CPU is provided for producing a control signal. In accordance with the control signal, a modulated signal modulated in pulse width by the control signal is produced. The modulated signal has a predetermined duty ratio based on the control signal. A liquid crystal driving signal having the duty ratio based on the modulated signal is produced. The CPU is for producing the control signal for setting the duty ratio in accordance with a refractive index at each of the unit electrode of the liquid crystal panel.
摘要翻译：提供用于产生控制信号的CPU。根据控制信号，产生通过控制信号以脉冲宽度调制的调制信号。调制信号基于控制信号具有预定的占空比。产生具有基于调制信号的占空比的液晶驱动信号。 CPU用于产生用于根据液晶面板的每个单位电极处的折射率来设置占空比的控制信号。

10. 发明授权

US5886496A Tilt servo controlling apparatus 失效
标题翻译：倾斜伺服控制装置
公开(公告)号：US5886496A
公开(公告)日：1999-03-23
申请号：US61865
申请日：1998-04-17
申请人： Junichi Furukawa , Kiyoshi Tateishi , Noriaki Murao
发明人： Junichi Furukawa , Kiyoshi Tateishi , Noriaki Murao
IPC分类号： G11B7/095 , G11B7/135 , B64C17/02
CPC分类号： G11B7/0956
摘要： A tilt servo controlling apparatus is provided with: an optical pickup for emitting a light beam onto an optical record medium and detecting a reflection light from the optical record medium to thereby output a detection signal; a level detecting device for detecting a level of the detection signal outputted by the optical pickup; a tilt error correcting device for correcting a tilt error due to an aberration, which is generated by a tilt angle between (i) a normal line of a surface of the optical record medium at a position irradiated with the light beam and (ii) an optical axis of the light beam; and a tilt error correction controlling device for outputting a control signal to control a correction amount of the tilt error correcting device, by giving a variation to the control signal on a time base and adjusting the control signal so that the level detected by the level detecting device be optimized with respect to the variation of the control signal.
摘要翻译：倾斜伺服控制装置具有：光学拾取器，用于将光束发射到光学记录介质上并检测来自光学记录介质的反射光，从而输出检测信号; 电平检测装置，用于检测由光学拾取器输出的检测信号的电平; 倾斜误差校正装置，用于校正由像差引起的倾斜误差，该倾斜误差校正装置是由（i）在光束照射的位置处的光学记录介质的表面的法线之间的倾斜角度产生的，（ii）光束的光轴; 以及倾斜误差校正控制装置，用于输出控制信号以控制倾斜误差校正装置的校正量，通过对时基上的控制信号进行变化并调整控制信号，使得由电平检测检测到的电平器件相对于控制信号的变化进行优化。

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