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1. 发明专利

JPH09167377A OPTICAL DISK DEVICE AND OPTICAL HEAD USED THEREIN 失效
公开(公告)号：JPH09167377A
公开(公告)日：1997-06-24
申请号：JP32681295
申请日：1995-12-15
申请人： HITACHI LTD , HITACHI MEDIA ELECTRON KK
发明人： SUGI YASUYUKI , SUGIYAMA TOSHIO , IMADA RITSUO , FUKUI YUKIO , SHINOHARA HIDENORI , FUJITA SHINJI
IPC分类号： G11B7/09 , G11B7/135
摘要： PROBLEM TO BE SOLVED: To provide an optical disk device without having any deteriorated detecting signals by attaching a diagram preventing the vignetting of a reflected light from an optical information recording medium or limiting its vignetting amount within an allowable range even when the objective lens is decentered. SOLUTION: A light from a laser 1 is made a parallel light by a collimator lens, a light flux diameter is decided by a diagram 4 so as to decide the numeral aperture of objective lens, the light is passed through a half mirror 9 and a concave lens 3 and converged on the recording surface 8 of a compact disk 6 by an objective lens 5. A reflected light from the disk is reflected by the half mirror 9 and converged on a photodiode 11. For recording/reproducing of a high density recording medium, the concave lens 3 and the diaphragm 4 are removed from an optical path. By preventing the reflected light from passing through the diaphragm 4, the vignetting of the reflected light from the disk is prevented and thereby, the optical disk device having no detecting deterioration and having a simple mechanism can be provided.

2. 发明专利

JPH09180237A OPTICAL DISK DEVICE AND OPTICAL HEAD THEREFOR 失效
公开(公告)号：JPH09180237A
公开(公告)日：1997-07-11
申请号：JP33642795
申请日：1995-12-25
申请人： HITACHI LTD , HITACHI MEDIA ELECTRON KK
发明人： FUJITA SHINJI , SUGI YASUYUKI , SUGIYAMA TOSHIO , IMADA RITSUO , FUKUI YUKIO , SHINOHARA HIDENORI
IPC分类号： G11B7/135
摘要： PROBLEM TO BE SOLVED: To prevent detection signal from being deteriorated by vignetting of reflected light from a disk by a simple mechanism, with respect to an optical disk device and an optical head used therefor which record or reproduce onto or from two or more different kinds of optical disks by a system that reduces aberration of light spot by means of inserting and extraction an interchangeable lens. SOLUTION: A mechanism is provided to insert and extract an interchangeable lens 4 and an annular polarizing plate 5 in one body based on a judgment by a disk discriminating means. In the state where the interchangeable lens 4 is inserted, p-polarized incident light emitted from a light emitting element 1 cannot pass through the annular polarizing plate 5, and a prescribed numerical aperture is decided by a hole provided. On the other hand, even though a reflected light beam from a disk 10 is deviated from the incident light due to eccentricity of an objective lens 8, the reflected light can pass through the annular polarizing plate 5 while the beam is changed in its polarizing direction to be made s-polarized light through a quarter wave length plate 6.

3. 发明专利

JPH10177741A OPTICAL HEAD AND OPTICAL DISK DEVICE 失效
公开(公告)号：JPH10177741A
公开(公告)日：1998-06-30
申请号：JP33399996
申请日：1996-12-13
申请人： HITACHI LTD , HITACHI MEDIA ELECTRON KK
发明人： FUJITA SHINJI , SHINOHARA HIDENORI , SUGIYAMA TOSHIO , IMADA RITSUO , FUKUI YUKIO
IPC分类号： G11B7/14 , G11B7/00 , G11B7/12 , G11B7/125 , G11B7/135
摘要： PROBLEM TO BE SOLVED: To provide a small-sized optical head which is also mountable at an optical disk device having a limitation on transverse and longitudinal directions and thickness direction relating to the optical disk device which executes recording and/or reproducing 22 kinds of the optical disks varying in corresponding wavelengths. SOLUTION: A dichroic mirror 6 or a polarization beam splitter is disposed as a light synthesizing and separating means between a mirror 4 and an objective lens 7, by which the arrangement of an optical system corresponding to the first disk and an optical system corresponding to the second disk are made into a two-layered structure and the adequate selection of the transverse and longitudinal directions and thickness direction of the optical head is made possible. As a result, the small-sized optical head which is hardly restricted by the size of the optical disk device is provided.

4. 发明专利

JPH09190642A OPTICAL DISK DEVICE 失效
公开(公告)号：JPH09190642A
公开(公告)日：1997-07-22
申请号：JP286796
申请日：1996-01-11
申请人： HITACHI LTD , HITACHI MEDIA ELECTRON KK
发明人： IMADA RITSUO , SUGI YASUYUKI , SHINOHARA HIDENORI , SUGIYAMA TOSHIO , FUKUI YUKIO
IPC分类号： G11B7/125 , G11B7/135
摘要： PROBLEM TO BE SOLVED: To provide an optical disk device capable of properly recording and reproducing a signal on each of two kinds of optical disks which are different in thickness of their substrates and recording density by setting light spots converged on the two kinds of disks to a prescribed ratio in diameter. SOLUTION: A laser beam emitted from a light emitting element 1 is converged via a collimator lens 3 and a beam splitter element 4 by an objective lens 8 onto the disk 9. A limiting aperture 5 is provided in an optical path form the light emitting element 1 to the objective lens 8 to be able to taken in and out to the optical path, and is changed depending on the kind of disk 9 so that the ratio of the light spot diameters on the disk is set to be 1:1.3 to 1:1.6.

5. 发明专利

JPH10222865A OPTICAL PICKUP AND OPTICAL DISK DEVICE 失效
公开(公告)号：JPH10222865A
公开(公告)日：1998-08-21
申请号：JP2478597
申请日：1997-02-07
申请人： HITACHI LTD , HITACHI MEDIA ELECTRON KK
发明人： OTA MITSUHIKO , IMADA RITSUO , SUGIYAMA TOSHIO , FUKUI YUKIO
IPC分类号： G11B7/135
摘要： PROBLEM TO BE SOLVED: To minimize the interference between a spot and a ring zone by the pits, which are adjacent to each other in tangential and radial directions, and to obtain optimally reproduced signals by tilting the major axis of the ellipse of the spot against the pit columns on a high density optical disk for an appropriate angle within a specific angular range. SOLUTION: In a semiconductor laser 70, a PN joint surface 700, which emits light beams, is tilted for an angle (90 deg.-θ) against an x-y plane through the rotation about a y direction as an axis. Moreover, the optical axis formed among a luminous flux separating means 92, a collimating lens 91 and a mirror 93 is set to normal against the line which connects the center of an objective lens 900 and the center of an optical disk. By forming the above, the spot formed on a high density optical disk 50 is irradiated under the condition in which the major axis of the ellipse of the spot is tilted for an angle θ with respect to the pit columns. By setting the angle θ to an appropriate value, which is more than 45 degrees and less than 66 degrees, optimally reproduced signals are obtained.

6. 发明专利

JPH10188317A OPTICAL HEAD AND OPTICAL DISK DEVICE 失效
公开(公告)号：JPH10188317A
公开(公告)日：1998-07-21
申请号：JP33972996
申请日：1996-12-19
申请人： HITACHI LTD , HITACHI MEDIA ELECTRON KK
发明人： FUJITA SHINJI , SHINOHARA HIDENORI , SUGIYAMA TOSHIO , IMADA RITSUO , FUKUI YUKIO , SUGI YASUYUKI
IPC分类号： G11B7/125
摘要： PROBLEM TO BE SOLVED: To obtain an optical head which is of a thin type and is miniaturized by arranging a high-density disk optical system and a conventional disk optical system in a same flat plane and also converging a luminous flux after the synthesis performed by using a light synthesizing and separating element and a polarizing element. SOLUTION: The luminous flux reflected at a polarizing beam splitter 7 is made incident on the quater-wave plate 8 made one body with the splitter 7 and is reflected on a mirror surface 9 and it passes forth and back the quater- wave plate 8 to be emitted at the side of the splitter 7. The outgoing light is coverted from an s-polarized light into a p-polarized light and the luminous flux made incident on the splitter 7 again as the p-polarized light passes through it as it is to headed to an objective lens for high-density disk 3. A luminous flux emitted from a laser module for conventional disk 2 is made incident on the spilitter 7 as an s-polarized light and the advancing direction of it is changed to be guided to an objective lens for conventional disk 4. Thus, a recording and/or a reproduction can be performed with respect to disks of one kind or more whose corresponding wavelengths and thicknesses are different.

7. 发明专利

JPH09204683A OPTICAL PICKUP AND OPTICAL DISC DRIVE 失效
公开(公告)号：JPH09204683A
公开(公告)日：1997-08-05
申请号：JP1066196
申请日：1996-01-25
申请人： HITACHI LTD , HITACHI MEDIA ELECTRON KK
发明人： IMADA RITSUO , SUGI YASUYUKI , SHINOHARA HIDENORI , SUGIYAMA TOSHIO , FUKUI YUKIO
IPC分类号： G11B7/24 , G11B7/09 , G11B7/125 , G11B7/135 , G11B19/12
摘要： PROBLEM TO BE SOLVED: To record or reproduce a signal while removing aberration due to difference in the thickness of disc through a simple mechanism having no mechanical switching mechanism for two kinds or more of optical discs having difference thickness of substrate. SOLUTION: A laser luminous flux 2 emitted from a first light emitting element 1 is passed through a collimate lens 7 to produce a collimate luminous flux which is passed through a luminous flux multiplexing/demultiplexing element 9 and focused through an objective lens 19 onto a thin high density disc 20 formed on a disc substrate. A laser luminous flux 12 emitted from a second light emitting element 11 is passed through the luminous flux multiplexing/ demultiplexing element 9 and enters, as a diverging luminous flux, into the objective lens 19 before being focused on a conventional thick disc formed on a disc substrate 20a thus correcting spherical aberration due to difference in the thickness of disc. A signal processing circuit is switched based on the decision results of a disc type decision means.

8. 发明专利

JPH10222853A OPTICAL PICKUP AND OPTICAL DISK DEVICE 失效
公开(公告)号：JPH10222853A
公开(公告)日：1998-08-21
申请号：JP2046097
申请日：1997-02-03
申请人： HITACHI LTD , HITACHI MEDIA ELECTRON KK
发明人： OTA MITSUHIKO , IMADA RITSUO , FUJITA SHINJI , SUGIYAMA TOSHIO , FUKUI YUKIO
IPC分类号： G11B7/09 , G11B7/135
摘要： PROBLEM TO BE SOLVED: To make possible sharedly reproducing or recording plural kinds of optical disks by returning reflection light from the optical disk to a photo-detector in the vicinity of a light source with a diffraction grating, reproducing or recording plural kinds of optical disks. SOLUTION: A first diffractive grating 23 for separating light from a light source 1 to main luminous flux and two sub-luminous fluxes and a second diffractive grating 22 for guiding to a photodetector are formed on an optical element block 2, and the second diffraction grating 22 is separated to four areas, and the photodetector 3 is constituted so that a photodetecting part so as to be able to detect a recording/reproducing signal, a focus error signal using a spot size method, a tracking error signal using a phase difference method, the tracking error signal using a three spots method and the tracking error signal using a differential push-pull method is arranged. Three tracking error signal detecting methods are switched to a signal processing circuit suited to kinds of respective disks by a system control circuit based on a discriminate result of a disk kind discriminant to be executed.

9. 发明专利

JP2008091018A Objective lens 有权
标题翻译：物镜
公开(公告)号：JP2008091018A
公开(公告)日：2008-04-17
申请号：JP2007279777
申请日：2007-10-29
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： IMADA RITSUO , SUGI YASUYUKI , SHINOHARA HIDENORI , SUGIYAMA TOSHIO , FUKUI YUKIO
IPC分类号： G11B7/135 , G02B13/00
摘要： PROBLEM TO BE SOLVED: To provide an optical disk device capable of eliminating an aberration caused by a thickness difference of a disk substrate and recording/reproducing a disk for two or more types of optical disks different in substrate thickness by a simple structure of no mechanical switching mechanism, capable of recording or reproducing a signal and to provide an optical pickup using the optical disk device. SOLUTION: A laser luminous flux emitted from a first light emitting element are changed into parallel luminous fluxes through a collimator lens, and passed through a luminous flux combining/separating element to be condensed on the thin high-density disk of a disk substrate by an objective lens. A laser luminous flux emitted from a second light emitting element is passed through the luminous flux combining/separating element to enter the objective lens as a dispersed luminous flux, and condensed on the conventional thick disk of a disk substrate. Thus, a spherical aberration caused by a difference in disk thickness is corrected. A signal processing circuit is switched based on the determination result of a disk type determination means. COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：要解决的问题：提供一种光盘装置，其能够消除由盘基板的厚度差引起的像差，并且通过简单的结构对基板厚度不同的两种或更多种类型的光盘记录/再现盘没有机械切换机构，能够记录或再现信号，并提供使用光盘装置的光学拾取器。解决方案：从第一发光元件发射的激光光束通过准直透镜变成平行光通量，并通过光束组合/分离元件，以冷凝在盘的薄高密度盘上衬底由物镜。从第二发光元件发射的激光光束通过光束组合/分离元件，作为分散的光通量进入物镜，并在盘基片的常规厚盘上冷凝。因此，校正由盘厚度差引起的球面像差。基于盘类型确定装置的确定结果切换信号处理电路。版权所有（C）2008，JPO＆INPIT

10. 发明专利

JPH0773493A OPTICAL PICKUP AND OPTICAL DISK DEVICE LOADING THE SAME 失效
公开(公告)号：JPH0773493A
公开(公告)日：1995-03-17
申请号：JP21966293
申请日：1993-09-03
申请人： HITACHI LTD
发明人： IMADA RITSUO , SHIBATA TORU , KUSANO YOSHITAKA , INOUE MASAYUKI
IPC分类号： G11B7/12
摘要： PURPOSE:To provide a simple and inexpensive optical pickup miniaturized and prevented from the positional deviation in respective parts. CONSTITUTION:A light emitting element 3 and a reflection mirror 5 are mounted on a semiconductor substrate 1 forming a photodetector 6. The semiconductor substrate 1 is mounted on a substrate supporting member 33, and they are sealed in a package 13 made of a transparent resin. A luminous flux separated by a diffraction grating 9 provided on a hologram element 7 is made incident on the photodetector 6, and a signal is detected.

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