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1. 发明专利

JP2005158126A Optical pickup unit 审中-公开
标题翻译：光学拾取单元
公开(公告)号：JP2005158126A
公开(公告)日：2005-06-16
申请号：JP2003393266
申请日：2003-11-25
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 , ITO AKIKO , ONISHI KUNIKAZU
IPC分类号： G11B7/135
摘要： PROBLEM TO BE SOLVED: To provide a low-priced optical pickup unit which is mounted with a two-wavelength multi-laser light source and has optimum optical system magnification common to DVD and CD. SOLUTION: Optical parameters such as an objective numerical aperture, the far field pattern of a semiconductor laser light source, and optical system magnification are set so that a DVD-side light spot diameter is ≤1.03 μm or crosstalk to a DVD-RAM 2 is ≤-22 dB and power on a CD-side optical disk surface is ≥40 mW at the time of absolute maximum rating light pulse output of a CD-side semiconductor laser beam source. Consequently, the optical pickup unit has the same reproducing performance for DVD and recording/reproducing performance for CD with the conventional optical pickup unit. COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：提供一种安装有双波长多激光光源的低价光学拾取单元，并具有DVD和CD通用的最佳光学系统倍率。解决方案：设定诸如目标数值孔径，半导体激光光源的远场图案和光学系统放大率的光学参数，使得DVD侧光点直径≤1.03μm或与DVD- 在CD侧半导体激光束源的绝对最大额定光脉冲输出时，RAM2为≤-22dB，CD侧光盘表面的功率为≥40mW。因此，光学拾取单元具有与常规光学拾取单元相同的用于DVD的再现性能和用于CD的记录/再现性能。版权所有（C）2005，JPO＆NCIPI

2. 发明专利

JP2004334949A Optical pickup and optical information recording and reproducing apparatus using it 有权
公开(公告)号：JP2004334949A
公开(公告)日：2004-11-25
申请号：JP2003127253
申请日：2003-05-02
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： KAWAMURA TOMOHITO , ONISHI KUNIKAZU
IPC分类号： G11B7/09 , G11B7/13 , G11B7/135
摘要： PROBLEM TO BE SOLVED: To make it possible to precisely detect the tracking error signal independent of the track spacing of an optical disk. SOLUTION: In a photo detector 9, when generating a tracking error signal, an optical beam from a semiconductor laser is divided into a 0-th diffraction optical beam, a positive primary diffraction optical beam, and a negative primary diffraction optical beam by a diffraction grating, reflected from an optical disk, and the 0th diffraction optical beam is detected in a light receiving area 15 which consists of light receiving faces 15ab and 15cd arranged at spacing a0, the positive primary diffraction optical beam is detected in a light receiving area 16 which consists of light receiving faces 16a and 16b arranged at spacing b0, and a negative primary diffraction optical beam is detected in a light receiving area 17 which consists of light receiving faces 17a and 17b arranged at spacing c0. Arithmetic operations are carried out to these detected signals respectively, and a tracking error signal by a push-pull method is generated. COPYRIGHT: (C)2005,JPO&NCIPI

3. 发明专利

JP2004103189A Optical pickup device and optical disk device 审中-公开
公开(公告)号：JP2004103189A
公开(公告)日：2004-04-02
申请号：JP2002267561
申请日：2002-09-13
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 , INOUE MASAYUKI , FUKUI YUKIO
IPC分类号： G11B7/00 , G11B7/09 , G11B7/12 , G11B7/135 , H04N5/85
CPC分类号： G11B7/1374 , G11B7/0925 , G11B7/121 , G11B2007/0006 , G11B2007/13727 , H04N5/85
摘要： PROBLEM TO BE SOLVED: To solve the problem that, since an operation distance of an objective lens for a high density optical disk is short, there is a strong possibility of one objective lens' colliding with an optical disk at the time when the other objective lens is in focus control if driven by an optical pickup device with a plurality of objective lenses including an objective lens for the high density optical disk mounted in the same lens holder and an optical disk device using the same. SOLUTION: In the optical pickup device with the plurality of objective lenses including the objective lens for the high density optical disk mounted thereon and the optical disk device using the same device, a relative position in an optical axis direction of the objective lens in the lens holder is predetermined. COPYRIGHT: (C)2004,JPO

4. 发明专利

JP2004103076A Optical pickup, and optical information recording or reproducing apparatus 审中-公开
公开(公告)号：JP2004103076A
公开(公告)日：2004-04-02
申请号：JP2002260895
申请日：2002-09-06
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 , IZUMI KATSUHIKO , KAWAMURA TOMOHITO
IPC分类号： G11B7/09 , G11B7/135
摘要： PROBLEM TO BE SOLVED: To provide a new tracking error signal detection system which can detect a tracking error signal which is offset free and always good for many kinds of optical disk and practical without depending on a difference in a track pitch of disk or displacement of objective lens, and to provide an optical pickup, or an optical information recording or reproducing apparatus using the system. SOLUTION: The optical pickup is provided with a laser light source 1; an optical branch measures 2 to branch the laser beam emitted from the laser light source 1 to at least three luminous fluxes; a condensed light optical system 5 which condenses three luminous fluxes, and irradiates three independent condensing spots respectively on record surface of optical information recording medium; a photodetector 20 arranged so that it may receive the return light from an optical information recording medium 10 of three condensing spots at an acceptance surface which is split into two or more; and an actuators equipped with the function of driving the condensed light optical system 5 in the direction of nearly orthogonal at least to the recording track of the optical information recording medium 10. The optical pickup integrally drives the optical branch measures 2 and the condensed light optical system 5. COPYRIGHT: (C)2004,JPO

5. 发明专利

JP2004063073A Optical head and optical disk device 有权
公开(公告)号：JP2004063073A
公开(公告)日：2004-02-26
申请号：JP2003207963
申请日：2003-08-20
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： SHIMANO TAKESHI , NAKAMURA SHIGERU , ONISHI KUNIKAZU , INOUE MASAYUKI , FUKUI YUKIO
IPC分类号： G11B7/24 , G11B7/095 , G11B7/135
摘要： PROBLEM TO BE SOLVED: To eliminate disturbance occurring to a defocus signal when an optical spot crosses a track on a recording film surface in accompanying the eccentricity of an optical disk center and to cancel offset of a tracking error signal accompanying lens movement. SOLUTION: A wave front phase of ±one-dimensional diffracted light is shifted by λ/2 in a cycle Dλ/2 (2P*NA) by a phase reverser diffraction grating 701 in which a phase reverses in the same cycle as above in the radial direction of an optical disk and a sub-spot is arranged on the same track as the main spot on the optical disk. By adding a main- and sub-spot defocus error signals in an appropriate gain ratio, the disturbance occurring to the defocus error signal can be canceled. By subtracting the main- and sub-spots tracking error signals by a push/pull system in an appropriate gain ratio, the offset can be canceled. COPYRIGHT: (C)2004,JPO

6. 发明专利

JP2003308627A Optical head and optical disk drive employing the same 审中-公开
标题翻译：光头和光盘驱动器使用它
公开(公告)号：JP2003308627A
公开(公告)日：2003-10-31
申请号：JP2002111471
申请日：2002-04-15
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： MAEDA NOBUYUKI , ONISHI KUNIKAZU , FUJIMORI SHINYA
IPC分类号： G11B7/135
摘要： PROBLEM TO BE SOLVED: To provide a small-sized optical head with high performance. SOLUTION: In the optical head provided with: at least one laser light source 2; a collimate lens 6; an objective lens 8; a photodetector 11 for receiving a reflected light from an optical disk 9; and an optical component located in a carriage and having functions of reflecting or transmitting a luminous flux emitted from the laser light source 2 and leading the luminous flux to the collimate lens 6 and of reflecting or transmitting a reflected light from the optical disk 9 and leading the light to the photodetector 11, a filter 13 is arranged, the transmissivity of which is increased or decreased in the radial direction of an information recording disk medium, between the optical component and the photodetector. COPYRIGHT: (C)2004,JPO
摘要翻译：要解决的问题：提供具有高性能的小尺寸光学头。解决方案：在具有：至少一个激光光源2的光学头中; 准直透镜6; 物镜8; 用于接收来自光盘9的反射光的光电检测器11; 以及位于托架中的光学部件，其具有反射或透射从激光光源2发出的光束的功能，并且将光束引导到准直透镜6，并且反射或透射来自光盘9的反射光，并且引导光到光检测器11的光，在光学部件和光电检测器之间布置滤光器13，其透光率在信息记录盘介质的径向方向上增大或减小。版权所有（C）2004，JPO

7. 发明专利

JP2002269784A OPTICAL HEAD AND OPTICAL DISK DEVICE USING THE SAME 失效
公开(公告)号：JP2002269784A
公开(公告)日：2002-09-20
申请号：JP2001073286
申请日：2001-03-15
申请人： HITACHI LTD , HITACHI MEDIA ELECTRON KK
发明人： MAEDA NOBUYUKI , IZUMI KATSUHIKO , ONISHI KUNIKAZU , IIZAKA SHINYA , WATANABE MASAYOSHI , SATAKE MITSUO , ITO TETSUO
IPC分类号： G11B7/09 , G11B7/135
摘要： PROBLEM TO BE SOLVED: To provide a miniature and inexpensive DVD/CD compatible optical head having a high performance. SOLUTION: This optical head is provided with at least two laser beam sources, a collimator lens, an objective lens, and a photodetector for receiving the light reflected from the optical disk, and also provided with an elastic supporting member for supporting a lens holder to hold the objective lens and a fixed part for supporting this elastic supporting member, then, the packaging spaces of optical components are secured in such a manner that a magnetic yoke having a gap part and at least two magnets are arranged at the side opposite to the fixed part with respect to the objective lens and at least a part of the collimator lens is arranged in the gap part of the magnetic yoke. By this arrangement, the DVD/CD compatible optical head having the high performance is realized.

8. 发明专利

JP2001222837A OPTICAL HEAD AND OPTICAL INFORMATION REPRODUCING DEVICE USING IT 失效
公开(公告)号：JP2001222837A
公开(公告)日：2001-08-17
申请号：JP2000032732
申请日：2000-02-04
申请人： HITACHI LTD , HITACHI MEDIA ELECTRON KK
发明人： ARAI NOBUO , ONISHI KUNIKAZU , SUENAGA HIDEO
IPC分类号： G11B7/135
摘要： PROBLEM TO BE SOLVED: To provide an optical head and an optical disk device that are simply structured for mass-productivity and that facilitate miniaturization and light- weight, by reducing a working distance between a collimator lens and a detecting lens. SOLUTION: The collimator lens in the optical system of the head is constituted of meniscus type lenses whose center of curvature is all on a semiconductor laser side, and/or the detecting lens in the optical system of the head is constituted of meniscus type lenses whose center of curvature is all on a photodetector side. The optical head of this invention is mounted on an optical disk device or a magneto-optical disk device.

9. 发明专利

JPH11134661A OPTICAL HEAD AND OPTICAL RECORDING/REPRODUCING DEVICE USING IT 失效
公开(公告)号：JPH11134661A
公开(公告)日：1999-05-21
申请号：JP29517997
申请日：1997-10-28
申请人： HITACHI LTD
发明人： FUKUI MASAKAZU , SUZUKI MOTOYUKI , ONISHI KUNIKAZU , SASAKI TORU , FUKUI YUKIO , SHINODA IKUO , SAITO HIRONORI
IPC分类号： G11B7/09
摘要： PROBLEM TO BE SOLVED: To detect a displacement direction or a displacement amount of an objective lens without providing an exclusive detector on an objective lens drive means. SOLUTION: A diffraction grating 4 provided with an axial slide type actuator 10 and providing a cross-shaped division line between an objective lens 6 and a photodetector is arranged. The diffraction grating 4 quadrisects reflected luminous flux from an optical disk, and diffracted light diffraction separated in respective areas are led between respective independent light receiving surfaces on the photodetector by a detection lens. A direction of a boundary between the light receiving surfaces 9a, 9b or between the light receiving surfaces 9c, 9d is set up nearly vertically to the displacement direction of a light spot on the photodetector associated with tracking operation, and by detecting differences between respective light receiving surface outputs, the displacement direction or the displacement amount of the objective lens 6 is detected.

10. 发明专利

JPH10143883A OPTICAL HEAD DEVICE 失效
公开(公告)号：JPH10143883A
公开(公告)日：1998-05-29
申请号：JP29482296
申请日：1996-11-07
申请人： HITACHI LTD
发明人： ONISHI KUNIKAZU , INOUE MASAYUKI , SASAKI TORU
IPC分类号： G11B7/09
摘要： PROBLEM TO BE SOLVED: To select an optimum detection system from two kinds of obtained tracking control signals with different detection systems by performing different operational processing to various detection signals obtained from a multi-division photodetector. SOLUTION: A hologram element 4 provided upward laser light 2 is divided to four parts by a cross-shaped division line, and respective parts are provided with diffraction grating grooves of respectively different patterns. Reflection light is diffraction separated to ±1st-order diffracted light 102c-102d at every divided area. On the other hand, the photodetector 5 forms detection surfaces a-f six divided to an oblong shape, and they answer to respective diffracted light spots. At this time, the diffracted light spots are photoelectric converted, and are operation processed by prescribed operation circuits 200-204, 207-210 to detect various control signals, information signals. Thereafter, respective output signals are inputted to a phase difference detection circuit 206 through a signal delay circuit 205 to detect a tracking control signal by a differential phase detection DPD system and a push-pull system.

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