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公开(公告)号：US5805557A
公开(公告)日：1998-09-08
申请号：US927198
申请日：1997-09-11
申请人： Hitoshi Furuhata , Aki Terajima , Shigeru Takaya , Masufumi Asada
发明人： Hitoshi Furuhata , Aki Terajima , Shigeru Takaya , Masufumi Asada
CPC分类号： G11B7/1353 , G02B5/1814 , G11B7/094 , G11B7/131 , G11B7/0912
摘要： There is provided an optical pickup which comprises a light source, an objective lens for converging a beam from the light source onto an optical disc, a diffraction grating for passing a beam returning from the optical disc, a photo-detector for receiving returning beams passing through the diffraction grating. The diffraction grating is divided into two areas, each area including alternatively arranged first diffraction grating pattern and second diffraction grating pattern.
摘要翻译： 提供了一种光学拾取器，其包括光源，用于将来自光源的光束会聚到光盘上的物镜，用于使从光盘返回的光束通过的衍射光栅，用于接收通过的返回光束的光检测器 通过衍射光栅。 衍射光栅分为两个区域，每个区域包括交替布置的第一衍射光栅图案和第二衍射光栅图案。
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2.发明申请OPTICAL PICKUP DEVICE AND OPTICAL RECORDING MEDIUM INFORMATION REPRODUCTION DEVICE 失效光学拾取器件和光学记录介质信息生成器件公开(公告)号：US20090285077A1
公开(公告)日：2009-11-19
申请号：US12159117
申请日：2006-12-13
申请人： Hitoshi Furuhata
发明人： Hitoshi Furuhata
IPC分类号： G11B7/135
CPC分类号： G11B7/0903 , G11B7/131 , G11B7/1353 , G11B2007/0006
摘要： The present invention provides an optical pickup device and optical recording medium information reproduction device that are capable of reproducing information that is recorded on a plurality of kinds of optical discs having different track pitches. With the present invention, an optical pickup device generates a main beam and sub beams that are made up from pairs of semi sub beams, such that the distance in the radial direction between center positions of a pair of semi sub spots on an optical disc where a pair of semi sub beams are formed is an odd multiple of half the track pitch of the optical disc, and the distance in the radial direction between center positions of semi sub spots that correspond to another pair of sub semi sub beams is an odd multiple of half the track pitch of another optical disc.
摘要翻译： 本发明提供了一种能够再现记录在具有不同轨道间距的多种光盘上的信息的光学拾取装置和光学记录介质信息再现装置。 利用本发明，光学拾取装置产生由一对半子光束构成的主光束和副光束，使得在光盘上的一对半子光点的中心位置之间的径向方向上的距离， 形成一对半子光束是光盘的轨道间距的一倍的奇数倍，并且对应于另一对子半子光束的半子光点的中心位置之间的径向距离是奇数倍 是另一个光盘的轨道间距的一半。
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3.发明授权Optical pickup device and optical recording medium information reproduction device 失效光学拾取装置和光学记录介质信息再现装置公开(公告)号：US07965609B2
公开(公告)日：2011-06-21
申请号：US12159117
申请日：2006-12-13
申请人： Hitoshi Furuhata
发明人： Hitoshi Furuhata
CPC分类号： G11B7/0903 , G11B7/131 , G11B7/1353 , G11B2007/0006
摘要： The present invention provides an optical pickup device and optical recording medium information reproduction device that are capable of reproducing information that is recorded on a plurality of kinds of optical discs having different track pitches. With the present invention, an optical pickup device generates a main beam and sub beams that are made up from pairs of semi sub beams, such that the distance in the radial direction between center positions of a pair of semi sub spots on an optical disc where a pair of semi sub beams are formed is an odd multiple of half the track pitch of the optical disc, and the distance in the radial direction between center positions of semi sub spots that correspond to another pair of sub semi sub beams is an odd multiple of half the track pitch of another optical disc.
摘要翻译： 本发明提供了一种能够再现记录在具有不同轨道间距的多种光盘上的信息的光学拾取装置和光学记录介质信息再现装置。 利用本发明，光学拾取装置产生由一对半子光束构成的主光束和副光束，使得在光盘上的一对半子光点的中心位置之间的径向方向上的距离， 形成一对半子光束是光盘的轨道间距的一倍的奇数倍，并且对应于另一对子半子光束的半子光点的中心位置之间的径向距离是奇数倍 是另一个光盘的轨道间距的一半。
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公开(公告)号：US5473586A
公开(公告)日：1995-12-05
申请号：US305419
申请日：1994-09-13
申请人： Hitoshi Furuhata
发明人： Hitoshi Furuhata
CPC分类号： G11B7/0901 , G11B7/094 , G11B7/133 , G11B7/1365
摘要： An optical pickup is adapted to be operated in accordance with a tracking error signal obtained by a push-pull method. The pickup has a photodetector including a pair of detector elements disposed side by side. An astigmatizer is disposed on an axis of a light beam reflected from an optical disc for producing an astigmatic beam. The photodetector is positioned outside a point where a spot of the astigmatic beam becomes a circular shape, and a boundary line between the two detector elements is disposed on a line along which the spot moves in a tracking operation.
摘要翻译： 光拾取器适于根据通过推挽方法获得的跟踪误差信号进行操作。 拾取器具有包括并排设置的一对检测器元件的光电检测器。 散光器设置在从用于产生散光光束的光盘反射的光束的轴上。 光检测器位于散光束的斑点变为圆形的点之外，并且两个检测器元件之间的边界线设置在跟踪操作中斑点移动的线上。
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公开(公告)号：US07149174B2
公开(公告)日：2006-12-12
申请号：US10267838
申请日：2002-10-10
IPC分类号： G11B7/00
CPC分类号： G11B7/1362 , G11B7/126
摘要： An optical pickup which appropriately detects reflected light and return light reflected back from an information recording medium even if a laser light B1 emitted from a light source varies in wavelength. The transmittances of a half mirror to the laser light B1 emitted from the light source, and to the reflected light Bwr, Ber or the return light Brr reflected back from the information recording medium are preset according to a predetermined condition, i.e., Tpc(λc)/Tp(λ)=(1−Ts(λ)/(1−Tsc(λc))×(Tsc(λc)/Ts(λ)). Here, λ is a predetermined wavelength emitted from a semiconductor laser as the light source, Ts(λ) is a transmittance to the laser light B1 with a predetermined polarization, Tp(λ) is a transmittance to the reflected light Bwr, Ber or the return light Brr reflected back from the information recording medium when the laser light B1 with the predetermined wavelength λ is emitted, Tsc(λc) is a transmittance to the laser light B1 with a wavelength λc when the semiconductor laser varies in wavelength characteristic, and Tpc(λc) is a transmittance to the reflected light Bwr, Ber or the return light Brr reflected back from the information recording medium when the laser light B1 with the wavelength λc is emitted.
摘要翻译： 即使从光源射出的激光B 1的波长变化，也适当地检测从信息记录介质反射的反射光和返回光的光学拾取器。 根据预定条件，预先设定从光源发射的半反射镜和从信息记录介质反射回的反射光Bwr，Ber或返回光Brr的半反射镜的透射率，即Tpc lambdac）/ Tp（λ）=（1-Ts（λ）/（1-Tsc（lambdac））x（Tsc（lambdac）/ Ts（λ））这里，λ是从半导体激光器发射的预定波长 光源Ts（λ）是对具有预定极化的激光B 1的透射率，Tp（λ）是对于从信息记录介质反射回来的反射光Bwr，Ber或返回光Brr的透射率，当 发射具有预定波长λ的激光B 1，当半导体激光器在波长特性上变化时，Tsc（lambdac）是具有波长lambdac的激光B 1的透射率，Tpc（lambdac）是对反射光的透射率 Bwr，Ber或返回光Brr反射回来 当发射具有波长兰博的激光B 1时，从信息记录介质。
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公开(公告)号：US06813235B2
公开(公告)日：2004-11-02
申请号：US09990451
申请日：2001-11-21
IPC分类号： G11B700
CPC分类号： G11B7/127 , G11B7/1353 , G11B2007/0006
摘要： An optical pickup apparatus has a simplified configuration for using a plurality of laser beams at different wavelength to reduce the size, and a laser diode chip for use therewith. An irradiation light path for leading a laser beam emitted from a light emitter to a recording medium is provided with an optical axis correcting element for passing a first laser beam and for diffracting a second laser beam having a wavelength different from that of the first laser beam to generate diffracted light which has the optical axis substantially matching the optical axis of the first laser beam. The optical axis correcting element is arranged at a position at which the center of a light intensity distribution of the first laser beam incident thereto matches the center of a light intensity distribution of the second laser beam incident thereto.
摘要翻译： 光拾取装置具有用于使用不同波长的多个激光束以减小尺寸的简化配置，以及与其一起使用的激光二极管芯片。 用于将从发光体发射的激光束引导到记录介质的照射光路设置有用于使第一激光束通过并用于衍射具有与第一激光束的波长不同的波长的第二激光束的光轴校正元件 以产生具有基本上与第一激光束的光轴匹配的光轴的衍射光。 光轴校正元件布置在入射到其中的第一激光束的光强度分布的中心与入射到其上的第二激光束的光强度分布的中心相匹配的位置处。
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公开(公告)号：US06845078B2
公开(公告)日：2005-01-18
申请号：US10679361
申请日：2003-10-07
CPC分类号： G11B7/1374 , G02B27/0025 , G11B7/0956 , G11B7/135 , G11B7/1376 , G11B7/1378 , G11B7/13922 , G11B7/22 , G11B2007/0006
摘要： An optical pickup apparatus comprises a first light source for emitting a first laser beam having a first wavelength; a second light source for emitting a second laser beam having a second wavelength; and an objective lens for condensing the first laser beam and the second laser beam. The first light source and the second light source are disposed in positions in such a way that a total amount of coma aberration, which is generated on the first laser beam in accordance with a distance between the first light source and an optical axis of a whole optical system and coma aberration, which is generated on the first laser beam in accordance with a tilting amount of the objective lens becomes null, and a total amount of coma aberration, which is generated on the second laser beam in accordance with a distance between the second light source and said optical axis and coma aberration, which is generated on the second laser beam in accordance with the tilting amount of the objective lens becomes null.
摘要翻译： 一种光学拾取装置包括用于发射具有第一波长的第一激光束的第一光源; 用于发射具有第二波长的第二激光束的第二光源; 以及用于冷凝第一激光束和第二激光束的物镜。 第一光源和第二光源被设置在这样的位置，使得根据第一光源和整个光轴之间的距离在第一激光束上产生的彗差的总量 根据物镜的倾斜量在第一激光束上产生的光学系统和彗形像差成为零，以及根据第二激光束之间的距离在第二激光束上产生的彗差的总量 第二光源和根据物镜的倾斜量在第二激光束上产生的所述光轴和彗形像差变为零。
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公开(公告)号：US06643246B2
公开(公告)日：2003-11-04
申请号：US10091355
申请日：2002-03-06
IPC分类号： G11B700
CPC分类号： G11B7/1353 , G11B7/0906 , G11B7/0912 , G11B7/0943 , G11B7/131 , G11B7/133 , G11B2007/0006
摘要： An optical pickup apparatus which, assuming that a distance from a first light source to a first grating is a, a distance from a second light source to a second grating is b, a first predetermined grating pitch is I, a second predetermined grating pitch is J, the wavelength of a first laser beam is &lgr;1, and the wavelength of a second laser beam is &lgr;2, satisfies &lgr;1/&lgr;2>(I·b)/(J·a), and which is capable of preventing a drop in the level of a tracking error signal resulting from decentering of an optical recording medium, even in the case of using either of optical recording media of different recording densities.
摘要翻译： 一种光拾取装置，假设从第一光源到第一光栅的距离为a，从第二光源到第二光栅的距离为b，第一预定光栅间距为I，第二预定光栅间距为 J，第一激光束的波长为λ1，第二激光束的波长为λ2，满足λ1/λ2>（Ib）/（Ja），并且能够防止跟踪电平的下降 即使在使用不同记录密度的光记录介质的情况下，光记录介质的偏心也产生误差信号。
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