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101. 发明专利

JP2002269805A OPTICAL HEAD AND OPTICAL DISK DEVICE USING THE SAME 失效
公开(公告)号：JP2002269805A
公开(公告)日：2002-09-20
申请号：JP2001073288
申请日：2001-03-15
申请人： HITACHI LTD , HITACHI MEDIA ELECTRON KK
发明人： ONISHI KUNIKAZU , IZUMI KATSUHIKO , MAEDA NOBUYUKI , FUJIMORI SHINYA , SATAKE MITSUO , WATANABE MASAYOSHI , IIZAKA SHINYA
IPC分类号： G11B7/135 , G11B7/125
摘要： PROBLEM TO BE SOLVED: To provide a miniature optical head having high performance dealing with CD-R recording and compatible to DVD/CD. SOLUTION: At least one wavelength plate is arranged in the optical path from at least two laser beam sources such as the 1st laser beam source oscillating with the 1st wavelength in the range of 620 nm to 680 nm wavelength and the 2nd laser beam source oscillating with the 2nd wavelength in the range of 750 nm to 810 nm wavelength, to an objective lens converging luminous fluxes emitted from the 1st and 2nd laser beam sources, and also this wavelength plate is abutted and fixed on the surface perpendicular to the optical axis of an optical part arranged in the above optical path.

102. 发明专利

JP2002269795A OPTICAL PICKUP AND OPTICAL INFORMATION REPRODUCING DEVICE USING THE SAME 失效
公开(公告)号：JP2002269795A
公开(公告)日：2002-09-20
申请号：JP2001071383
申请日：2001-03-14
申请人： HITACHI LTD , HITACHI MEDIA ELECTRON KK
发明人： IZUMI KATSUHIKO , ONISHI KUNIKAZU , SASAKI TORU , MATSUDA YUTAKA
IPC分类号： G11B7/135
摘要： PROBLEM TO BE SOLVED: To provide an optical system such as reducing the P-polarization component of a return light to a semiconductor laser with the simple constitution, when the dependency of transmissivity polarization, the phase difference, etc., exist in optical components such as a dichroic half prism, etc., as to an optical pickup, and to reduce further the change of detecting light quantity by a photodetector even to the change of disk retardation. SOLUTION: In the optical pickup provided with a polarization element for converting the polarized state of a light beam emitted from the semiconductor laser, the photodetector for detecting the light beam reflected from an optical disk, and a branching optical element for branching the going path optical system including the semiconductor laser and the returning path optical system including the photodetector, the polarization element is arranged in the optical path between the semiconductor laser and the branching optical element, and simultaneously the angle θ between the polarizing direction of the light beam emitted from the semiconductor laser and the optical axis of the polarization element, or the phase difference α between the transmitting polarization light in the direction of optical axis of the polarization element and the transmitting polarization light in the axial direction perpendicular thereto is arranged to set to the prescribed value.

103. 发明专利

JP2002245660A OPTICAL PICKUP DEVICE AND OPTICAL INFORMATION REPRODUCING DEVICE USING IT 失效
公开(公告)号：JP2002245660A
公开(公告)日：2002-08-30
申请号：JP2001043968
申请日：2001-02-20
申请人： HITACHI LTD , HITACHI MEDIA ELECTRON KK
发明人： SHIMADA KENICHI , FUKUI YUKIO , ONISHI KUNIKAZU , IZUMI KATSUHIKO , INOUE MASAYUKI , MAEDA NOBUYUKI
IPC分类号： G11B7/135 , G11B7/125
摘要： PROBLEM TO BE SOLVED: To provide an optical pickup device by which plural kinds of optical disks including a high density DVD disk are interchangeably reproduced. SOLUTION: Three semiconductor laser beam sources having different oscillating wavelengths are mounted on the optical pickup device. Further, a two-wavelength multi-laser beam source wherein two semiconductor lasers are provided in the same housing body is used in order to miniaturize and simplify the optical pickup. Also, a light receiving surface pattern, in which the number of output pins is reduced by having a light receiving surface in common, is obtained.

104. 发明专利

JP2001209960A PHOTODETECTOR AND OPTICAL INFORMATION RECORDING AND REPRODUCING DEVICE USING THE SAME 失效
公开(公告)号：JP2001209960A
公开(公告)日：2001-08-03
申请号：JP2000023285
申请日：2000-01-27
申请人： HITACHI LTD
发明人： KATSUKI MANABU , KUREBAYASHI MASAAKI , ONISHI KUNIKAZU , IZUMI KATSUHIKO
IPC分类号： G11B7/09 , G11B7/13 , H01S5/0683
摘要： PROBLEM TO BE SOLVED: To downsize a photodetector without the deterioration of its performance and to make its function higher with a size as in the past. SOLUTION: The number of the output signals of the photodetector is decreased by computing the detection output of a prescribed region by using a subtracter, by which the downsizing is realized. Or the higher function is realized with the size kept unchanged by allocating the decreased output terminals to the higher function.

105. 发明专利

JP2001184700A OPTICAL ELEMENT, OPTICAL PICKUP OR OPTICAL INFORMATION REPRODUCING DEVICE MOUNTED THE ELEMENT 失效
公开(公告)号：JP2001184700A
公开(公告)日：2001-07-06
申请号：JP36221899
申请日：1999-12-21
申请人： HITACHI LTD , HITACHI MEDIA ELECTRON KK
发明人： FUJIMORI SHINYA , SUENAGA HIDEO , OGASAWARA HIROSHI , ONISHI KUNIKAZU , IZUMI KATSUHIKO
IPC分类号： G11B7/135 , G02B5/10
摘要： PROBLEM TO BE SOLVED: To solve conventional problems, that astigmatic difference can not be corrected with respect to the optical pickup in which an optical beam is reflected by a planar reflecting mirror and guided to an objective lens, and cost of parts for a wavelength-selective prism is high because such prism as synthesizes laser beams of two different wavelengths on a midway optical path is composed of combined components. SOLUTION: An optical element that reflects an optical beam emitted from a semiconductor laser light source is designed to have a spherical shape having a prescribed radius of curvature.

106. 发明专利

JP2001043553A OPTICAL PICKUP AND OPTICAL INFORMATION REPRODUCING DEVICE USING IT 失效
公开(公告)号：JP2001043553A
公开(公告)日：2001-02-16
申请号：JP21316199
申请日：1999-07-28
申请人： HITACHI LTD , HITACHI MEDIA ELECTRON KK
发明人： IZUMI KATSUHIKO , SUENAGA HIDEO , OGASAWARA HIROSHI , SASAKI TORU , INOUE MASAYUKI , ONISHI KUNIKAZU
IPC分类号： G11B7/135
摘要： PROBLEM TO BE SOLVED: To reduce the number of components and cost by making up an optical element of a condensing optical system wherein a recording medium is selectively irradiated with one light beam of two semiconductor laser beam sources with a parallel flat plate and transmitting the light beam in a position where the light beam is in a convergent state. SOLUTION: A reflecting film reflecting a laser beam of e.g. 650 nm wavelength is formed on the surface of a dichroic mirror 4 being an optical element consisting of a parallel flat plate. A holgram unit 3 is composed of a semiconductor laser 10 of e.g. 650 nm wavelength, a hologram 11 and photodetectors 12a, 12b, outgoing optical flux is reflected by the reflecting film of the dichroic mirror 4, and a light spot is formed on an information recording surface of an optical disk 1 such as a DVD-ROM. A hologram unit 9 is composed of the semiconductor laser 13 of e.g. 785 nm wavelength, a hologram 14 and photodetectors 15a, 15b, the outgoing optical flux transmits the dichroic mirror 4, and the light spot is formed on the information recording surface of an optical disk 2 such as a CD-ROM.

107. 发明专利

JP2000339718A OPTICAL DETECTOR AND SIGNAL PROCESSING CIRCUIT, AND OPTICAL INFORMATION REPRODUCING DEVICE USING THEM 失效
公开(公告)号：JP2000339718A
公开(公告)日：2000-12-08
申请号：JP14421899
申请日：1999-05-25
申请人： HITACHI LTD
发明人： IZUMI KATSUHIKO , ONISHI KUNIKAZU , INOUE MASAYUKI
IPC分类号： G11B7/09 , G11B7/13 , G11B7/135 , G11B7/14
摘要： PROBLEM TO BE SOLVED: To enable to cope with increment of speed by providing a light receiving surface quadri-divided in at least one light receiving region, and by irradiating simultaneously different record information trains of three or more lines on an optical information recording medium with light beams branched to three or more lines of at least one group converged to the optical information recording medium. SOLUTION: Each detected current photoelectric-converted and detected by each light receiving surface a-d is converted into voltage by current-voltage conversion amplifier 40-43 provided in the inside of a package of an optical detector 9, and sent to an output terminal of the optical detector 9. In the same way, each output line of light receiving surface e-l is connected to current- voltage conversion amplifiers 44-51 and each a-l is outputted to 12 output terminals of the optical detector 9 respectively. Operation is performed for output signals a-d out of these signals by adders 52, 53 and a subtracter 57, a tracking signal, a focus error signal, and the like are calculated and are made control information.

108. 发明专利

JP2000285482A PHOTODETECTOR, SIGNAL PROCESING CIRCUIT AND OPTICAL INFORMATION REPRODUCING APPARATUS USING THE SAME CIRCUITS 失效
公开(公告)号：JP2000285482A
公开(公告)日：2000-10-13
申请号：JP8538499
申请日：1999-03-29
申请人： HITACHI LTD
发明人： IZUMI KATSUHIKO , ONISHI KUNIKAZU , INOUE MASAYUKI
IPC分类号： G11B7/09 , G11B7/13
摘要： PROBLEM TO BE SOLVED: To realize simultaneous reproduction of three recording tracks with three optical beam spots that are effective for high speed data transfer rate during reproduction of existing optical discs such as CD, CD-ROM and CD-R, in addition to a high density disc such as DVD-RAM, DVD-ROM disc using an optical head having simplified structure with only one photodetector. SOLUTION: Excellent focus error detection and tracking error detection are performed from three optical beams reflected from an optical disc, and simultaneously, the information signal is reproduced from the three independent recording track using three optical spots, by providing semiconductor laser light sources 1, 11, objective lenses 6, 15, diffraction gratings 4, 13 for dividing the optical beam to three beams and one photodetector 9 having the light receiving surface, where at least one light receiving region among three regions is divided into four sections.

109. 发明专利

JP2000002652A PHASE DIFFERENCE MEASUREMENT METHOD AND PHASE DIFFERENCE MEASURING DEVICE OF OPTICAL PART USING THE SAME 失效
公开(公告)号：JP2000002652A
公开(公告)日：2000-01-07
申请号：JP17076498
申请日：1998-06-18
申请人： HITACHI LTD
发明人： NAKAO TAKESHI , ONISHI KUNIKAZU
IPC分类号： G01J9/00 , G01M11/02 , G01N21/23
摘要： PROBLEM TO BE SOLVED: To specify the phase difference and the direction of an optical axis with a simple optical system, by measuring the elliptical rate of a light beam through a sample and the angle between an elliptical long axis and incidence straight-line polarization. SOLUTION: A light beam emitted from a light source 1 is propagated in Z-axis direction, and transmission light of an analyzer 2 is converted into straight-line polarization in X-axis direction. The transmission light of the analyzer 2 generally becomes an elliptical polarization with a long axis in the direction of an angle of θ=θmax for an incidence straight-line polarization direction (X-axis direction). Then, by rotating an analyzer 4 around a light axis (Z axis) and measuring the output of a photo detector 5, inclination angles θmax and θmin of the long and short axes for the incidence polarization direction (X axis) are obtained from light intensity Imax and Imin corresponding to the long and short axes of elliptical polarization and the rotary angle of the analyzer 4. By using these values, a phase difference Δ of a sample 3 and an angle formed by the sample 3 and the incidence polarization (namely, an azimuth angle α of the optical axis of the sample 3) can be calculated.

110. 发明专利

JPH1153759A OPTICAL HEAD AND OPTICAL DISK DEVICE USING THE HEAD 失效
公开(公告)号：JPH1153759A
公开(公告)日：1999-02-26
申请号：JP13801698
申请日：1998-05-20
申请人： HITACHI LTD
发明人： IZUMI KATSUHIKO , ONISHI KUNIKAZU , INOUE MASAYUKI , NAKAO TAKESHI , ARIMOTO AKIRA , SHIMANO TAKESHI , FUKUI YUKIO , SASAKI TORU , SHINODA IKUO , SAITO HIRONORI , FUJITA SHINJI , FUKUI MASAKAZU
IPC分类号： G11B7/09 , G11B7/135
摘要： PROBLEM TO BE SOLVED: To detect a tracking error signal with an optimum detection system for recordable/reproducing exclusive disks with different structures by mounting plural objective lenses on an axial slide type actuator and properly switching them. SOLUTION: Output signals from light receiving surfaces 9i-9l are suited to light intensity modulation signals of respective areas four dividing reflection luminous flux from an optical disk to a square with cross shape, and these are operated prescribedly by a phase difference detection circuit 202 through a signal delay circuit 201, and the tracking error signal in a DPD system is detected. Further, since the sum signals of respective output signals of the light receiving surfaces 9i and 9j, 9k and 9l are suited to the light intensity modulation signals of respective areas bisecting the disk reflection luminous flux in the radial direction, a difference signal of them is detected by an operational amplifier 204, and the tracking error signal is detected. In such a manner, respective light receiving surface output signals of a detector 9 are operated prescribedly, and a focus error signal and two kinds of tracking error signals by different detection systems are obtained simultaneously, and these are selected according to whether the disk is a recordable type or a reproducing exclusive type.

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