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1. 发明专利

JPS59185043A Optical disc device 失效
标题翻译：光盘设备
公开(公告)号：JPS59185043A
公开(公告)日：1984-10-20
申请号：JP5512583
申请日：1983-04-01
申请人： Hitachi Electronics Eng Co Ltd , Hitachi Ltd
发明人： KANEDA NORIYA , NAKAMURA SHIGERU , TOKUTOMI TERUAKI , TAKAHASHI SADAO
IPC分类号： G02B27/09 , G11B7/09 , G11B7/135
CPC分类号： G11B7/135 , G11B7/09
摘要： PURPOSE:To decrease the effect of variance in the distribution of a radiated light on a tracking characteristic by combining a triangular prism correcting the intensity distribution of light and the optical system at the post-stage in a specific direction. CONSTITUTION:The laser light outputted from a collimator lens 12 having the elliptic distribution taking the x axis as the minor axis and the y axis as the major axis is corrected with magnification in the x axis direction by the triangular prism 13 and after the light of nearly circular distribution goes straight in the z axis direction, the light is reflected in the y axis direction and irradiated onto a track T running in the x axis direction. Thus, the direction of intensity correction of a light spot S is made coincident with the direction of a pit of the track T to an information recording face of an optical disc, and even if a variation is produced in the intensity distribution of the spot S because of the variation in the correcting amount of the like of the triangular prism 13 or the intensity distribution of the output light of a semiconductor element 11, this variation appears in the lengthwise direction of the track and a nearly constant intensity distribution is obtained in the track width direction affected on the tracking characteristic, allowing nearly to uniform the tracking performance.
摘要翻译：目的：通过组合三角棱镜来校正光的强度分布和光学系统在特定方向的后期阶段，减少辐射光分布的变化对跟踪特性的影响。构成：从具有作为短轴的x轴和作为长轴的y轴的椭圆形分布的准直透镜12输出的激光通过三角棱镜13在x轴方向上被放大倍数校正，并且在近似圆形的分布在z轴方向上呈直线状，光沿y轴方向反射并照射到在x轴方向上行进的轨迹T. 因此，使光点S的强度校正方向与轨道T的凹坑的方向一致，到光盘的信息记录面，并且即使在斑点S的强度分布中产生变化由于三角棱镜13的校正量的变化或半导体元件11的输出光的强度分布的变化，这种变化出现在轨道的长度方向上，并且在轨道宽度方向受到跟踪特性的影响，允许跟踪性能几乎一致。

2. 发明专利

JP2001143315A OPTICAL HEAD AND OPTICAL INFORMATION RECORDING/ REPRODUCING DEVICE USING IT 失效
公开(公告)号：JP2001143315A
公开(公告)日：2001-05-25
申请号：JP32775099
申请日：1999-11-18
申请人： HITACHI LTD
发明人： ARIKAWA YASUYUKI , NAKAMURA SHIGERU , SHIGEMATSU KAZUO
IPC分类号： G11B7/00 , G11B7/12 , G11B7/125 , G11B7/13 , G11B7/135
摘要： PROBLEM TO BE SOLVED: To reduce the size and the cost of an optical head for recording/ reproducing a plurality of kinds of optical information recording media corresponding to a plurality of kinds of different wavelengths. SOLUTION: In the optical head which is composed by incorporating a plurality of laser beam sources and a plurality of light receiving elements corresponding to the plurality of laser beam sources, one laser beam source of the plurality of laser beam sources is composed of a individual laser diode and is further composed of laser module consisting of the laser beam sources other than it and the plurality of light receiving elements. Thus, the optical head can be miniaturized.

3. 发明专利

JP2001001889A VEHICLE DRIVING DEVICE 失效
公开(公告)号：JP2001001889A
公开(公告)日：2001-01-09
申请号：JP17797399
申请日：1999-06-24
申请人： HIGASHI NIPPON RYOKAKU TETSUDO , HITACHI LTD
发明人： ABIKO HIROSHI , NAKAMURA SHIGERU , NAGASHIMA HIDEAKI , MASUDA SEIKICHI , SATO MASAJI
IPC分类号： B61C9/46 , H02K5/16
摘要： PROBLEM TO BE SOLVED: To prevent a serious damage to an axle even if an elastic member is deteriorated or damaged. SOLUTION: A rotor support member supporting both end parts of a rotor member 6 on an axle 1 comprises a first support member fixed to the axle 1, a second support member fixed to the rotor member, and an elastic joint member 17 for connecting these support members. Also, limiting means is provided to limit a movement amount of the second support member in axle radial direction relative to the first support member to a value equal to or smaller than a minimum clearance between the inner peripheral surface of the rotor member and the outer peripheral surface of the axle so that, even if the rotor member falls down due to deterioration or damage of the elastic member, serious damage is not given to the axle.

4. 发明专利

JPH11273132A Optical head 失效
标题翻译：光学头
公开(公告)号：JPH11273132A
公开(公告)日：1999-10-08
申请号：JP7695698
申请日：1998-03-25
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： NAKAMURA KIMIO , NAKAMURA SHIGERU
IPC分类号： G11B7/135
摘要： PROBLEM TO BE SOLVED: To improve the reliability of holding a solid immersion lens close to a recording medium in an optical head capable of increasing the resolution of light by using the solid immersion lens and attaining high density recording.
SOLUTION: A surface of a solid immersion lens 1 to be used for an optical head which is faced to a recording medium 3 is formed into a curved surface. The lens 1 is brought into contact with the medium 3 and their contact force is detected by a means 5 and controlled by a means 6. Consequently stable close holding between the lens 1 and the medium 3 can be attained by the curved surface of the lens 1. Since the contact force is controlled, destruction or abrasion due to the contact between the lens 1 and the medium 3 can be suppressed and the contact state cart be held.
COPYRIGHT: (C)1999,JPO
摘要翻译：要解决的问题：提高通过使用固体浸没透镜提高光分辨率的光学头中靠近记录介质的固体浸没透镜的可靠性并实现高密度记录。解决方案：用于面向记录介质3的光学头的固体浸没透镜1的表面形成为曲面。透镜1与介质3接触，并且它们的接触力由装置5检测并由装置6控制。因此透镜1和介质3之间的稳定的紧密保持可以通过透镜的曲面实现由于可以控制接触力，可以抑制由于透镜1与介质3之间的接触引起的破坏或磨损，并且保持接触状态的推车。

5. 发明专利

JPH11175975A OPTICAL INFORMATION RECORDING/REPRODUCING DEVICE, METHOD FOR DETECTING ABNORMALITY OF INFORMATION RECORDING OPERATION IN SUCH DEVICE AND OPTICAL INFORMATION RECORDING MEDIUM INFORMATION RECORDED BY SUCH METHOD 失效
公开(公告)号：JPH11175975A
公开(公告)日：1999-07-02
申请号：JP33690797
申请日：1997-12-08
申请人： HITACHI LTD
发明人： TODA TAKESHI , NAKAMURA SHIGERU , MAEDA TAKESHI
IPC分类号： G11B7/00 , G11B7/0045 , G11B7/125 , G11B20/18
摘要： PROBLEM TO BE SOLVED: To provide an optical information recording/reproducing device improving reliability in recording information by an inexpensively constitutable recording/ reproducing head. SOLUTION: This device is the optical information recording/reproducing device constituted so that the information is recorded on a recording area on an optical recording medium 5 by using a laser beam from a semiconductor laser 1 oscillating the laser beam, and the information recorded on the recording area on the optical recording medium 5 is reproduced by using the laser beam from this semiconductor laser 1. At this time, at an information recording operation time, the reflected beam from the recording medium 5 of the laser beam emitted for recording the information is detected by a photodetector 7, and abnormality in recording is detected nearly simultaneously with this information recording operation by a recording time defect detection circuit 12 with this detected reflected beam. Further, when the abnormality is detected, the information is recorded again on another recording area on the optical recording medium 5.

6. 发明专利

JPH1166612A PHASE TRANSITION OPTICAL DISK MEDIUM 失效
公开(公告)号：JPH1166612A
公开(公告)日：1999-03-09
申请号：JP22772797
申请日：1997-08-25
申请人： HITACHI LTD
发明人： NAKAMURA SHIGERU , NISHIDA TETSUYA , MIYAMOTO MAKOTO
IPC分类号： G11B7/005 , G11B7/007 , G11B7/013 , G11B7/24 , G11B27/19 , G11B27/24 , G11B27/30
摘要： PROBLEM TO BE SOLVED: To obtain a large-capacity medium by specifying the intervals of the tracks of the phase transition optical disk medium formed with the groove parts of a recording layer and the tracks for recording information in the inter-groove parts by groove- like rugged shapes to a specific range and specifying the ratio of the optical reflectivity of the recording layer when the recording layer is the crystal phase of a phase transition film and when the layer changes to an amorphous phase to a specific value or below. SOLUTION: When the intervals of the tracks of the optical disk medium are specified to 0.54 to 0.64 μm and the optical reflectivity of the recording layer when the phase transition film is the crystal phase is defined as 1, the ratio of the optical reflectivity of the recording layer when the phase transition film changes to the amorphous phase is specified to

7. 发明专利

JPH10289461A INFORMATION RECORDING AND REPRODUCING DEVICE, AND INFORMATION RECORDING METHOD 失效
公开(公告)号：JPH10289461A
公开(公告)日：1998-10-27
申请号：JP9690997
申请日：1997-04-15
申请人： HITACHI LTD
发明人： TODA TAKESHI , NAKAMURA SHIGERU , MAEDA TAKESHI
IPC分类号： G11B7/007 , G11B7/0045 , G11B7/0055 , G11B7/006 , G11B7/125
摘要： PROBLEM TO BE SOLVED: To form highly accurate recorded marks by controlling the irradiation of a light based on a reflected light quantity to be detected for an nth time (n is a natural number) and a reflected light quantity to be detected for the next time while detecting states of a recorded part from the reflected light of a light to be irradiated on an information recording medium to suppress the fluctuation of recorded marks as much as possible. SOLUTION: A reflected light level in an unrecorded or erased state is detected with a first sampling pulse by irradiating a recording medium only with an erasing power in accordance with a power correction starting signal and a level to be detected with a next sampling pulse is predicted from the relation between the irradiation power and the reflected light level. Then, a setting power is changed according to the variation rate between a measured value and a predicted value by comparing the reflected light level measured with the next sampling pulse with the preliminarily predicated predicted level. That is, even when recorded marks are present already, mark shapes being the same as that of unrecorded marks are obtained by changing the setting power by the compared result between an (n+1)th predicted value to be calculated from an nth measured value and an (n+1)th measured value.

8. 发明专利

JPH10269615A OPTICAL INFORMATION REPRODUCING DEVICE 失效
公开(公告)号：JPH10269615A
公开(公告)日：1998-10-09
申请号：JP7575297
申请日：1997-03-27
申请人： HITACHI LTD
发明人： NAKAMURA SHIGERU , MAEDA TAKESHI
IPC分类号： G11B7/135
摘要： PROBLEM TO BE SOLVED: To cancel a cross talk noise incorporated in a main spot by generating a beam consisting of the main spot and a sub-spot orthogonally intersecting with each other in their polarizing directions, irradiating it and differential detecting reflection light from a recording medium. SOLUTION: A first polarizing beam 5a and a second polarizing beam 5b orthogonally intersecting with each other in their polarizing directions are formed for an outgoing beam from a semiconductor laser 1 by a composite 1/2 wavelength plate 4. The main spot 9a on a magneto-optical disk 8 surface converging the first polarizing beam 5a by a focus lens 7 is provided with a peak in its center, and since the second polarizing beam 5b is shifted by 180 deg. in left/right polarizing phases, the sub-spot 9b is provided with a bi-peak characteristic having a center of zero and two peaks in left/right. The reflection light from the magneto-optical disk 8 is converged by the lens 7 to be differential detected by a polarizing beam splitter 10, photo-detectors 11, 12 and a differential amplifier 13, and then, the cross talk noise from an adjacent track incorporated in a reflection signal from the main spot 9a is removed.

9. 发明专利

JP2574763B2 失效
公开(公告)号：JP2574763B2
公开(公告)日：1997-01-22
申请号：JP13590386
申请日：1986-06-13
申请人： HITACHI LTD
发明人： NAKAMURA SHIGERU , KATO TAKESHI , NAKAO TAKESHI
IPC分类号： G02B27/28 , G11B11/10 , G11B11/105

10. 发明专利

JP2561668B2 失效
公开(公告)号：JP2561668B2
公开(公告)日：1996-12-11
申请号：JP15347887
申请日：1987-06-22
申请人： HITACHI LTD
发明人： NAKAMURA SHIGERU , MACHIDA TEIJI , NAKAO TAKESHI , OSHIMA MASAHIRO
IPC分类号： G11B7/00 , G11B7/003 , G11B7/004 , G11B7/125 , G11B7/135 , G11B7/1356

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