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131. 发明专利

JP2005222601A Optical pickup, and optical information reproducing device or optical information recording/reproducing device 有权
标题翻译：光学拾取和光学信息重现设备或光信息记录/再现设备
公开(公告)号：JP2005222601A
公开(公告)日：2005-08-18
申请号：JP2004028902
申请日：2004-02-05
申请人： Hitachi Ltd , Hitachi Media Electoronics Co Ltd , 株式会社日立メディアエレクトロニクス , 株式会社日立製作所
发明人： MORI HIROMITSU , ONISHI KUNIKAZU , MAEDA NOBUYUKI
IPC分类号： G02B5/18 , G02B5/30 , G02B13/00 , G11B7/125 , G11B7/135
摘要： PROBLEM TO BE SOLVED: To provide a 3-wave compatible optical pickup capable of performing good recording/reproducing by using an objective lens common to three kinds of media of BD, a DVD, and a CD. SOLUTION: The optical pickup for performing reproducing/recording on a disk medium 122 by converging a light emitted from a laser light source on an objective lens 115 is provided with a first laser light source 101 for emitting the light of a wavelength λ1, a second laser light source 102 for emitting the light of a wavelength λ2 longer than the wavelength λ1, a third laser light source 103 for emitting the light of a wavelength λ3 longer than the wavelength λ2, an optical system having an optical path common to the lights emitted from the first to third laser light sources, an objective lens 115 having a lattice groove formed into a concentric circular shape on a refraction surface, and a wavelength selective phase difference element 117, a wavelength selective diffraction element 118, and a wavelength selective aperture element 119 disposed on the laser light source side of the objective lens. A parallel light is made incident on the wavelength selective diffraction element 118. COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：提供一种能够通过使用BD，DVD和CD的三种介质共同的物镜进行良好记录/再现的3波相容光学拾取器。解决方案：用于通过将从激光源发射的光聚焦在物镜115上的在盘介质122上进行再现/记录的光学拾取器设置有用于发射波长λ1的光的第一激光源101 用于发射长于波长λ1的波长λ2的光的第二激光光源102，用于发射长于波长λ2的波长λ3的光的第三激光光源103，具有与波长λ2相同的光路的光学系统从第一至第三激光源发射的光，具有在折射表面上形成为同心圆形的格子槽的物镜115，以及波长选择性相位差元件117，波长选择衍射元件118和波长设置在物镜的激光光源侧的选择性光圈元件119。并入光入射到波长选择性衍射元件118上。（C）2005，JPO＆NCIPI

132. 发明专利

JP2003272190A Optical pickup and optical information recording/ reproducing device 审中-公开
标题翻译：光学拾取和光学信息记录/再现设备
公开(公告)号：JP2003272190A
公开(公告)日：2003-09-26
申请号：JP2002078851
申请日：2002-03-20
申请人： Hitachi Ltd , Hitachi Media Electoronics Co Ltd , 株式会社日立メディアエレクトロニクス , 株式会社日立製作所
发明人： ONISHI KUNIKAZU , SHIMADA KENICHI
IPC分类号： G11B7/09 , G11B7/135
摘要： PROBLEM TO BE SOLVED: To provide an optical pickup which has a new tracking error signal detection means which excellently detects a tracking error signal for all optical disks which have a plurality of different kinds in which guiding groove pitches are remarkably different while keeping the offset decreasing effect of a tracking error signal as much as a conventional DPP system, and to provide an optical information recording/reproducing device. SOLUTION: The optical pickup is provided with a laser light source 1, a light branching element 2 which branches laser light emitted from the laser light source 1 into at least three light beams, a focusing optical system 5 which focuses the three light beams with which mutually independent three focused spots are irradiated on the recording face of an optical information recording medium 10 on which the guiding grooves are provided at a prescribed period, and a light detector 20 which independently receives the reflected light beams from the three light spots on the optical information recording medium 10. The distance between two adjacent focused spots among three focused spots in the direction which substantially diagonally crosses the guiding grooves is 0.25 to 0.75 times (except 0.5 times) the period of the guiding grooves. COPYRIGHT: (C)2003,JPO
摘要翻译：要解决的问题：为了提供一种具有新的跟踪误差信号检测装置的光学拾取器，其优良地检测具有多种不同种类的所有光盘的跟踪误差信号，其中导向槽间距显着不同，同时保持与常规DPP系统一样多的跟踪误差信号的偏移减小效果，并提供光信息记录/再现装置。解决方案：光学拾取器设置有激光光源1，将从激光光源1发射的激光分支为至少三个光束的光分支元件2，聚焦光学系统5，其聚焦三个光具有相互独立的三个聚焦点的光束照射在其上以规定的周期设置有导向槽的光学信息记录介质10的记录面上;以及光检测器20，其独立地接收来自三个光点的反射光束在光学信息记录介质10上。三个聚焦点之间的距离在基本上对角地穿过引导槽的方向上的两个相邻聚焦点之间的距离是引导槽的周期的0.25至0.75倍（除了0.5倍）。版权所有（C）2003，JPO

133. 发明专利

JP2003208726A OPTICAL PICKUP AND OPTICAL INFORMATION RECORDING/ REPRODUCING DEVICE USING THE SAME 审中-公开
公开(公告)号：JP2003208726A
公开(公告)日：2003-07-25
申请号：JP2002004045
申请日：2002-01-11
申请人： HITACHI LTD
发明人： KAWAMURA TOMOHITO , ONISHI KUNIKAZU , NAKAO TAKESHI
IPC分类号： G11B7/09 , G11B7/135
摘要： PROBLEM TO BE SOLVED: To provide an optical pickup using a high performance detecting method of a tracking control signal which prevents the destruction of a recording film due to a sub-light spot and does not reduce an amplitude of the tracking control signal. SOLUTION: By using a diffraction grating in which a grating groove pattern is formed to the curved state while keeping unequal spaces or a grating groove forming area is formed on only a limited area near an optical axis of laser luminous flux, the irradiation is made in such a state that a sub-light spot diameter is increased than a main light spot diameter, when the main light spot is converged up to the grating limit on the optical disk. By this arrangement, the light quantity density of the sub-light spot is reduced, and the optical pickup using the high performance detecting method of the tracking control signal is provided without destructing the optical disk nor reducing the amplitude of the tracking control signal. COPYRIGHT: (C)2003,JPO

134. 发明专利

JP2003157546A OPTICAL HEAD AND OPTICAL INFORMATION RECORDING/ REPRODUCING DEVICE USING THE SAME 审中-公开
公开(公告)号：JP2003157546A
公开(公告)日：2003-05-30
申请号：JP2001356856
申请日：2001-11-22
申请人： HITACHI LTD
发明人： NAKAO TAKESHI , MAEDA TAKESHI , ONISHI KUNIKAZU
IPC分类号： G11B7/085 , G11B7/09 , G11B7/135
摘要： PROBLEM TO BE SOLVED: To provide an optical head and an optical information recording/ reproducing device in which a pull-in action of focus control is possible even when an optical head which has a small working distance is used. SOLUTION: The focus control is pulled in by making a light beam incident on an objective lens, which light beam is a little more divergent at a time of focus control pull-in than at a time of ordinary recording and reproducing of information. After that, the divergence and convergence of the light beam are returned to a condition under which an ordinary information is recorded and reproduced.

135. 发明专利

JP2003141769A OPTICAL PICKUP AND OPTICAL DISK DEVICE 审中-公开
公开(公告)号：JP2003141769A
公开(公告)日：2003-05-16
申请号：JP2001331854
申请日：2001-10-30
申请人： HITACHI LTD , HITACHI MEDIA ELECTRON KK
发明人： SHIMADA KENICHI , KONUMA YOSHIHIRO , ONISHI KUNIKAZU , SUGIYAMA TOSHIO , YABE AKIO , TOMITA DAISUKE , ITO NAOKI
IPC分类号： G11B7/09 , G11B7/125 , G11B7/135
摘要： PROBLEM TO BE SOLVED: To provide an optical pickup equipped with two beam splitters capable of more efficiently combining optical beams from two semiconductor lasers even when an incident angle of light beams to the beam splitters varies or an oscillation wavelength of the semiconductor laser varies, and an optical disk device. SOLUTION: As a first beam splitter, a polarized beam splitter prism 10 having a polarized beam splitter film surface 10a for efficiently reflecting an S polarized light to efficiently transmit a P polarized light is used. Further, as characteristics of the polarized beam splitter film surface 10a, dichroic film characteristics for efficiently reflecting a light of a short wavelength to efficiently transmit a light of a long wavelength.

136. 发明专利

JP2003036557A Optical pickup device and optical information recording/ reproducing apparatus using the same 审中-公开
标题翻译：光学拾取装置和光信息记录/再现装置
公开(公告)号：JP2003036557A
公开(公告)日：2003-02-07
申请号：JP2001220835
申请日：2001-07-23
申请人： Hitachi Ltd , Hitachi Media Electoronics Co Ltd , 株式会社日立メディアエレクトロニクス , 株式会社日立製作所
发明人： SHIMADA KENICHI , ONISHI KUNIKAZU , SUGIYAMA TOSHIO , KONUMA YOSHIHIRO , YABE AKIO , ITO NAOKI , TODORI KAZUHIRO , TOMITA DAISUKE
IPC分类号： G11B7/09 , G11B7/135
摘要： PROBLEM TO BE SOLVED: To provide a miniaturized and low-price optical pickup device which can detect a servo signal well and can record, for a plurality of kinds of optical disks whose disk guide groove pitches are different. SOLUTION: The optical pickup device is used, in which five laser beams are concentrated on the optical disk using a grating 2a, and which selects the laser beam to be used for detecting the servo signal in accordance with the kind of the optical disk to be reproduced or recorded. A first, a second, a third, a fourth, and a fifth acceptance regions are provided at respective positions to which the five beams reflected by the optical disk are concentrated in a photodetector 9a, in which an acceptance surface which is divided into four like a cross-in-square shape is provided in at least one acceptance region.
摘要翻译：要解决的问题：为了提供一种可以很好地检测伺服信号并可以记录盘导向槽间距不同的多种光盘的小型化和低价格的光学拾取装置。解决方案：使用光拾取装置，其中使用光栅2a将五个激光束集中在光盘上，并且根据光盘的种类选择要用于检测伺服信号的激光束转载或录制。第一，第二，第三，第四和第五接收区域设置在光盘反射的五个光束集中在光电检测器9a中的各个位置处，其中接收表面被分成四个像在至少一个接受区域中提供十字形形状。

137. 发明专利

JP2002237085A OPTICAL PICKUP AND OPTICAL INFORMATION REPRODUCING DEVICE OR RECORDING DEVICE USING THE SAME 失效
公开(公告)号：JP2002237085A
公开(公告)日：2002-08-23
申请号：JP2001033091
申请日：2001-02-09
申请人： HITACHI LTD
发明人： ONISHI KUNIKAZU , SHIMADA KENICHI , IZUMI KATSUHIKO , MAEDA NOBUYUKI , INOUE MASAYUKI
IPC分类号： G11B7/004 , G11B7/125 , G11B7/135
摘要： PROBLEM TO BE SOLVED: To provide an optical pickup which is used in common for DVD/CD and manufactured at greatly reduced cost while maintaining special properties of small size and simple configuration realized by mounting a semiconductor laser module. SOLUTION: In an optical pickup which requires a plurality of laser beam sources like the optical pickup used in common for DVD/CD, the number of components and cost are decreased since optical detection systems can be put together in one system by using a semiconductor laser module for one of the laser beam sources and normal semiconductor laser beam sources for others, making light beams which are emitted by the normal semiconductor laser beam sources and reflected by an optical disk incident on the semiconductor laser module, and using an optical detector provided in the module as an optical detector for the laser beams emitted by the normal semiconductor laser beam sources.

138. 发明专利

JP2001222825A PHOTODETECTOR, OPTICAL PICKUP AND OPTICAL INFORMATION REPRODUCING DEVICE USING THE SAME 失效
公开(公告)号：JP2001222825A
公开(公告)日：2001-08-17
申请号：JP2000371484
申请日：2000-12-01
申请人： HITACHI LTD , HITACHI MEDIA ELECTRON KK
发明人： IZUMI KATSUHIKO , ONISHI KUNIKAZU , SHIMADA KENICHI , INOUE MASAYUKI , FUJITA SHINJI
IPC分类号： G02B5/18 , G02B5/32 , G11B7/09 , G11B7/13 , G11B7/135 , H01L31/10 , H01S5/40
摘要： PROBLEM TO BE SOLVED: To realize an optical system which is lower in cost and simpler than the conventional optical system constitution by the optical system constitution using inexpensive optical elements and fewest possible semiconductor lasers with an optical pickup for subjecting plural kinds of different optical disks to recording or reproducing of information. SOLUTION: The optical system constitution of the optical pickup consisting of the semiconductor laser having two laser beam sources of different wavelengths within one casing, one diffraction grating and one photodetector is adopted to a means to dissolve this theme. The optical pickup is provided with light receiving regions quadrisected to plurality of shapes, each of which is a square with a cross inside, in the positions irradiated with the light beam reflected from the optical disk and simultaneously, the focus error signals by an astigmatism system are formed respectively independently from these light receiving regions and the tracking error signals by a differential phase detection system are formed from one or both of the light receiving regions.

139. 发明专利

JP2001126304A OPTICAL PICKUP AND OPTICAL INFORMATION REPRODUCING DEVICE USING IT 失效
公开(公告)号：JP2001126304A
公开(公告)日：2001-05-11
申请号：JP30798899
申请日：1999-10-29
申请人： HITACHI LTD , HITACHI MEDIA ELECTRON KK
发明人： SHIMADA KENICHI , ONISHI KUNIKAZU , INOUE MASAYUKI , IZUMI KATSUHIKO , SUGIYAMA TOSHIO
IPC分类号： G11B7/09 , G02B5/32 , G11B7/125 , G11B7/135 , H01S5/022
摘要： PROBLEM TO BE SOLVED: To realize an optical pickup device capable of reproducing the information of plural kinds of optical disks using a two-wavelength multi laser beam source and moreover using one objective lens and one system of optical detecting system by using a prescribed hologram element. SOLUTION: The hologram element for respectively guiding zero-order diffracted light beams of optical beams of wavelength 650 nm band or +1st diffracted light beams or -1st diffracted light beams of optical beams of wave length 780 nm band which are emitted from the two-wavelength multi laser beam source and are deflected by an optical disk up to a prescribed position within a photodetector is set up. Also, the function of wavelength selectivity or polarization selectivity is imparted to the hologram element in order to improve the utilization efficiency of the light.

140. 发明专利

JP2000311380A OPTICAL INFORMATION RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JP2000311380A
公开(公告)日：2000-11-07
申请号：JP2000113218
申请日：2000-04-10
申请人： HITACHI LTD
发明人： ONISHI KUNIKAZU , SASAKI TORU , INOUE MASAYUKI , SUZUKI MOTOYUKI , SUZUKI YOSHIO , MIURA MICHIO , SAITO AKIRA , SHIGEMATSU KAZUO , KITADA YASUO
IPC分类号： G11B7/09 , G11B7/135 , G11B19/12
摘要： PROBLEM TO BE SOLVED: To provide an optical information recording and reproducing device in which stability of a focus control and a tracking control is secured even in recordings/reproductions by plural light spots and also interchangeability is attained even when substrate materials and track pitches of optical disks are different. SOLUTION: In this device, a luminous flux deflecting means which is constituted of a rotatable wedge shaped prism is provided in order to suppress the offset of a tracking error signal while reducing the positional deviation of a light spot on a detector and, moreover, with respect to the difference of substrate materials and track pitches of optical disks, a substrate discriminating circuit 16 and a track pitch discriminating circuit 17 are provided, and then, characteristics of a focus control circuit 6, tracking error detecting circuits 7, 9, a velocity detecting circuit 11 and a velocity instructing circuit 12 are changed over. As a result, stability of controls is secured even in recordings/ reproductions by plural light spots and also interchangeability is attained even with respect to the change of the optical disk and the positioning of the light spots to target tracks and recordings/reproductions/erasings are made possible.

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