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21. 发明授权

US06339581B1 Disc player having a prepit detecting circuit 失效
标题翻译：光盘播放器具有预坑检测电路
公开(公告)号：US06339581B1
公开(公告)日：2002-01-15
申请号：US09425178
申请日：1999-10-22
申请人： Masayoshi Yoshida , Yoshitaka Shimoda , Naoharu Yanagawa , Shinichi Nagahara
发明人： Masayoshi Yoshida , Yoshitaka Shimoda , Naoharu Yanagawa , Shinichi Nagahara
IPC分类号： G11B700
CPC分类号： G11B7/005 , G11B7/00745
摘要： A disc player having a prepit detecting circuit which can correctly detect prepits even if phases or amplitude levels of a plurality of read signals read out from a recording disc are deviated from each other. A phase difference between a first read signal and a second read signal read out by first and second reading elements arranged in two regions divided along the direction of recording tracks of a recording disc is detected. A first phase correction read signal is obtained by adjusting the phase of the first read signal by an amount according to the phase difference. A differential value between the first phase correction read signal and the second read signal is outputted as a prepit detection signal.
摘要翻译：即使从记录盘读出的多个读取信号的相位或幅度水平彼此偏离，也可以正确地检测预凹坑的预制坑检测电路。检测由沿着记录盘的记录轨道的方向划分的两个区域中排列的第一和第二读取元件读出的第一读取信号和第二读取信号之间的相位差。通过根据相位差调整第一读取信号的相位来获得第一相位校正读取信号。输出第一相位校正读取信号和第二读取信号之间的差分值作为预坑检测信号。

22. 发明授权

US06317400B1 Optical pickup apparatus 失效
标题翻译：光拾取装置
公开(公告)号：US06317400B1
公开(公告)日：2001-11-13
申请号：US09343285
申请日：1999-06-30
申请人： Naoharu Yanagawa , Shinichi Nagahara
发明人： Naoharu Yanagawa , Shinichi Nagahara
IPC分类号： G11B700
CPC分类号： G11B7/1356 , G11B7/126
摘要： An optical pickup apparatus is provided with: a light source (20) for emitting a light beam; an optical system (21, 22, 24, 25, 26, 27), which comprises an optical element (24) having an incident surface (24a), to which an AR (Anti-Reflection) coat is not applied and to which the light beam emitted from the light source is inputted obliquely by a predetermined incident angle, for guiding one portion of the emitted light beam transmitted through the incident surface onto an information record medium (32) and guiding a reflection light of one portion of the emitted light beam reflected from the information record medium, and also reflecting another portion of the emitted light beam by the incident surface; a main light detector (30) for receiving the reflection light from the information record medium guided by the optical system and outputting a main detection signal corresponding to record information recorded on the information record medium; a monitor detector (23) for receiving another portion of the emitted light beam reflected by the incident surface of the optical element and outputting a monitor detection signal corresponding to a light amount received by the monitor detector; and a controlling device (31) for controlling an output power of the light beam emitted from the light source on the basis of the monitor detection signal.
摘要翻译：一种光学拾取装置，具有：用于发射光束的光源（20）; 光学系统（21,22,24,25,26,27），其包括具有入射表面（24a）的光学元件（24），未施加AR（防反射）涂层，并且其中从光源发射的光束被倾斜地输入预定的入射角，用于将透射入射表面的发射光束的一部分引导到信息记录介质上，并引导发射光的一部分的反射光从信息记录介质反射的光束，并且还通过入射表面反射发射的光束的另一部分; 主光检测器（30），用于接收来自由光学系统引导的信息记录介质的反射光，并输出对应于记录在信息记录介质上的记录信息的主检测信号; 监视器检测器（23），用于接收由光学元件的入射表面反射的发射光束的另一部分，并输出与由监视器检测器接收的光量对应的监视器检测信号; 以及控制装置（31），用于根据监视器检测信号控制从光源发射的光束的输出功率。

23. 发明授权

US06246660B1 Device for controlling the power of a recording optical beam in an information storage apparatus 失效
标题翻译：用于控制信息存储装置中记录光束的功率的装置
公开(公告)号：US06246660B1
公开(公告)日：2001-06-12
申请号：US09275412
申请日：1999-03-24
申请人： Naoharu Yanagawa
发明人： Naoharu Yanagawa
IPC分类号： G11B700
CPC分类号： G11B7/126 , G11B7/0045 , G11B7/0903 , G11B7/131
摘要： A recording power control device is capable of optimizing the recording power of a recording optical beam at every recording position on a DVD-R (recordable) disk while an optical disk drive is recording information on the DVD-R disk with the recording optical beam. Simultaneously with the recording optical beam, the disk drive emits an adjusting optical beam behind the recording optical beam in the direction in which information is recorded. The disk drive has a first photodetector for receiving the reflected recording optical beam and a second photodetector for receiving the reflected adjusting optical beam. The recording power control device is equipped with a laser drive circuit for setting the recording power of the recording optical beam according to an output signal from the second photodetector, which receives the reflected adjusting optical beam.
摘要翻译：记录功率控制装置能够在DVD-R（可记录）盘的每个记录位置优化记录光束的记录功率，同时光盘驱动器利用记录光束在DVD-R盘上记录信息。与记录光束同时，磁盘驱动器在记录信息的方向上在记录光束的后面发射调整光束。磁盘驱动器具有用于接收反射的记录光束的第一光电检测器和用于接收反射的调整光束的第二光电检测器。记录功率控制装置配备有用于根据接收反射的调整光束的来自第二光电检测器的输出信号设置记录光束的记录功率的激光驱动电路。

24. 发明授权

US6160768A Floating optical pickup and information recording and reproducing apparatus including the same 失效
标题翻译：浮置光学拾取器和包括该拾取器的信息记录和再现装置
公开(公告)号：US6160768A
公开(公告)日：2000-12-12
申请号：US944221
申请日：1997-10-06
申请人： Naoharu Yanagawa
发明人： Naoharu Yanagawa
IPC分类号： G11B7/09 , G11B7/095 , G11B7/12 , G11B7/135 , G11B11/105 , G11B17/028 , G11B11/00
CPC分类号： G11B7/0956 , B82Y10/00 , G11B7/0927 , G11B7/0932 , G11B7/0933 , G11B7/0935 , G11B7/122 , G11B11/10576
摘要： An optical pickup (11) is provided with: a light source (2) for emitting a light beam (B); an objective lens (6) for condensing the emitted light beam onto an information record medium (1), which has an information record surface (1') for recording information thereon, from one external surface of the information record medium; and an immersion lens (7) disposed on an optical path of the condensed light beam between the objective lens and the information record medium for increasing a numerical aperture for the condensed light beam. The optical pickup is further provided with a floating device (33, 34, 40, 50, 45, 46, 47) for floating the immersion lens from the one external surface, such that a distance between a center of curvature of the immersion lens and the information record surface is within a predetermined tolerable range.
摘要翻译：光拾取器（11）具有：用于发射光束（B）的光源（2）; 用于将所发射的光束聚集到信息记录介质上的物镜，该信息记录介质具有从该信息记录介质的一个外表面的用于在其上记录信息的信息记录表面（1'）; 以及设置在物镜和信息记录介质之间的会聚光束的光路上的浸没透镜（7），用于增加聚光光束的数值孔径。光学拾取器还设置有浮动装置（33,34,40,50,45,46,47），用于将浸没透镜从一个外表面浮起，使得浸没透镜的曲率中心与信息记录表面在预定的可容忍范围内。

25. 发明授权

US6075759A Optical information recording and reproducing apparatus 失效
标题翻译：光信息记录和再现装置
公开(公告)号：US6075759A
公开(公告)日：2000-06-13
申请号：US6223
申请日：1998-01-13
申请人： Naoharu Yanagawa , Fumihiko Sano , Hiroshi Suzuki , Shinji Suzuki , Yasumitsu Suzuki , Masanori Nakahara
发明人： Naoharu Yanagawa , Fumihiko Sano , Hiroshi Suzuki , Shinji Suzuki , Yasumitsu Suzuki , Masanori Nakahara
IPC分类号： G11B11/10 , G11B7/003 , G11B7/0033 , G11B7/09 , G11B11/105 , G11B7/00
CPC分类号： G11B7/0031 , G11B7/0033 , G11B7/0901 , G11B11/1055
摘要： An optical record medium has an information record surface on which a plurality of circular arc tracks are arranged such that centers of the circular arc tracks are arranged in a straight line direction. An apparatus for optically recording and reproducing information onto and from the optical record medium is provided with: a rotatable optical system for emitting a light beam onto the circular arc track of the optical record medium which is being moved straight in the straight line direction, while being rotated with an rotational axis perpendicular to the information record surface; a straight moving device for relatively moving the rotatable optical system and the optical record medium to each other in the straight line direction; a detecting device for detecting a displacement amount from the circular arc track at an irradiated position on the information record surface of the light beam, on the basis of a reflection light from the circular arc track of the light beam, and outputting a displacement amount signal indicating the detected displacement amount; a perpendicularly moving device for relatively moving the optical record medium and the rotatable optical system to each other perpendicularly to the straight line direction such that the irradiated position approaches the circular arc track, on the basis of the outputted displacement amount signal; and a recording and reproducing device for recording and reproducing the information onto and from the optical record medium by use of the light beam emitted to the circular arc track.
摘要翻译：光学记录介质具有信息记录表面，多个圆弧轨迹被布置成使得圆弧轨迹的中心沿直线方向排列。一种用于在光学记录介质上光学地记录和再现信息的装置设置有：用于将光束发射到沿着直线方向直线移动的光学记录介质的圆弧轨道的可旋转光学系统，同时以垂直于信息记录表面的旋转轴线旋转; 用于使可旋转光学系统和光学记录介质在直线方向上彼此相对移动的直线移动装置; 检测装置，用于根据来自光束的圆弧轨迹的反射光检测在光束的信息记录表面上的照射位置处的圆弧轨迹的位移量，并输出位移量信号指示检测到的位移量; 垂直移动装置，用于基于输出的位移量信号，使光学记录介质和可旋转光学系统垂直于直线方向彼此相对移动，使得照射位置接近圆弧轨迹; 以及用于通过使用发射到圆弧轨道的光束将信息记录到光记录介质上并从光记录介质再现信息的记录和再现装置。

26. 发明授权

US5894460A Magneto-optical card recording apparatus employing an initialization magnet and a recording magnet 失效
标题翻译：采用初始化磁体和记录磁体的磁光卡记录装置
公开(公告)号：US5894460A
公开(公告)日：1999-04-13
申请号：US908176
申请日：1997-08-07
申请人： Naoharu Yanagawa , Fumihiko Sano , Hiroshi Suzuki , Shinji Suzuki , Yasumitsu Suzuki , Masanori Nakahara
发明人： Naoharu Yanagawa , Fumihiko Sano , Hiroshi Suzuki , Shinji Suzuki , Yasumitsu Suzuki , Masanori Nakahara
IPC分类号： G11B11/10 , G11B7/0033 , G11B11/105 , G11B11/00
CPC分类号： G11B11/10532 , G11B11/10552 , G11B7/0033
摘要： A rotary type pickup apparatus adopting a light modulation system, is capable of over-writing and suitable for miniaturization. In the optical pickup apparatus constituted by a stationary optical part and a rotary optical part which comprises an objective lens and a light beam guiding device, a recording magnet and an initialization auxiliary magnet are provided in the rotary optical part, the recording magnet being disposed close to the objective lens and the initialization auxiliary magnet being positioned over a rotation circumference where the objective lens rotates. Further provided are a recording magnet and an initialization auxiliary magnet which are disposed so as to pinch a magnetooptical recording medium together with the objective lens, the initialization auxiliary magnet being positioned behind the recording magnet in a sending direction of an optical card.
摘要翻译：采用光调制系统的旋转式拾取装置能够过写并适于小型化。在由固定光学部件和包括物镜和光束引导装置的旋转光学部件构成的光学拾取装置中，在旋转光学部件中设置有记录磁体和初始化辅助磁体，记录磁体靠近物镜和初始化辅助磁体位于物镜旋转的旋转圆周上。进一步提供了一种记录磁体和初始化辅助磁体，其被设置成与物镜一起夹住磁光记录介质，初始化辅助磁体位于记录磁体的后面，沿着光卡的发送方向。

27. 发明授权

US5465245A Optical pickup control system for an optical disc having recorded and non-recorded areas 失效
标题翻译：具有记录和非记录区域的光盘的光学拾取控制系统
公开(公告)号：US5465245A
公开(公告)日：1995-11-07
申请号：US246923
申请日：1994-05-20
申请人： Naoharu Yanagawa
发明人： Naoharu Yanagawa
IPC分类号： G11B7/085 , G11B7/00
CPC分类号： G11B7/08505
摘要： An optical pickup control system has an optical pickup for reproducing information recorded on an optical disc, a memory storing data on the position of a recorded area of the information and on the position of an unrecorded area of the disc. A control device is provided for controlling the pickup based on the data stored in the memory and stopping radial movement of the pickup on the disc when the pickup reaches the unrecorded area.
摘要翻译：光学拾取控制系统具有用于再现记录在光盘上的信息的光学拾取器，存储关于信息的记录区域的位置以及盘的未记录区域的位置的数据的存储器。提供一种控制装置，用于基于存储在存储器中的数据来控制拾取器，并且当拾取器到达未记录区域时停止拾取器在盘上的径向移动。

28. 发明授权

US5371725A Position control system for a read-write head of a magneto-optical disc player having heads which move independently from each other 失效
标题翻译：用于具有彼此独立移动的磁头的磁光盘播放机的读写头的位置控制系统
公开(公告)号：US5371725A
公开(公告)日：1994-12-06
申请号：US955373
申请日：1992-10-01
申请人： Naoharu Yanagawa , Shoji Taniguchi
发明人： Naoharu Yanagawa , Shoji Taniguchi
IPC分类号： G11B7/09 , G11B11/10 , G11B11/105 , G11B7/00 , G11B5/09 , G11B15/52 , G11B21/10
CPC分类号： G11B11/10573
摘要： A read-write head of a magneto-optical disc player has an optical head having an optical pickup, and a magnetic head having an electromagnet. The optical head and the magnetic head are each slidably held by guide members so as to be moved in a radial direction of an optical disc. A motor is mounted on each head for moving the head along the guide member. A relative position between both heads at a position where both heads oppose each other is detected, and both heads are moved along the guide members, maintaining the relative position.
摘要翻译：磁光盘播放器的读写头具有具有光学拾取器的光学头和具有电磁体的磁头。光头和磁头各自被引导构件可滑动地保持，以沿光盘的径向方向移动。电动机安装在每个头部上，用于沿着引导构件移动头部。检测在两个头部彼此相对的位置处的两个头部之间的相对位置，并且两个头部沿着引导构件移动，保持相对位置。

29. 发明授权

US5287367A Apparatus for controlling semiconductor laser 失效
标题翻译：半导体激光器控制装置
公开(公告)号：US5287367A
公开(公告)日：1994-02-15
申请号：US883153
申请日：1992-05-14
申请人： Naoharu Yanagawa
发明人： Naoharu Yanagawa
IPC分类号： H01S5/068 , G11B7/125 , H01S5/0683 , H01S5/0687 , H01S3/10
CPC分类号： G11B7/126 , H01S5/06837 , H01S5/0687
摘要： A semiconductor laser control apparatus is used for controlling a semiconductor laser as a light source in an optical pick-up device for optically reading information on an information recording medium. The semiconductor laser control apparatus carries out emission or absorption of heat with respect to a semiconductor laser emitting a laser beam by a temperature control element arranged adjacently to the semiconductor laser on the basis of a current delivered from the power supply.
摘要翻译：半导体激光控制装置用于在用于光学读取信息记录介质上的信息的光学拾取装置中控制半导体激光器作为光源。半导体激光控制装置基于从电源传递的电流，相对于与半导体激光器相邻布置的温度控制元件相对于发射激光的半导体激光器发射或吸收热量。

30. 发明授权

US5136567A Photo-detecting device 失效
标题翻译：光电检测装置
公开(公告)号：US5136567A
公开(公告)日：1992-08-04
申请号：US704159
申请日：1991-05-22
申请人： Shinichi Nagahara , Naoharu Yanagawa , Takaaki Matsumoto
发明人： Shinichi Nagahara , Naoharu Yanagawa , Takaaki Matsumoto
IPC分类号： G11B7/09 , G11B7/13
CPC分类号： G11B7/0906 , G11B7/0901 , G11B7/094 , G11B7/131
摘要： The light receiving surface of the light receiving element, which receives reflected light from an information recorded disc, is divided into sections along lines passing through the center of the surface which run parallel to and perpendicular to the direction of tracking and which also run at an angle of 45 degrees to the first two lines. The tracking errors are detected either by a push-pull method or a heterodyne method. The two methods are combined and alternately switched into operation depending on whether information is being written into or read from the information recording disc. The push-pull method uses a pair of opposing, divided light receiving surfaces disposed in the direction of tracking and the heterodyne method uses two pairs of opposing, divided surfaces disposed diagonally or at an angle of 45 degrees to the direction of tracking.
摘要翻译：光接收元件的受光元件的光接收表面，其接收来自信息记录盘的反射光，被划分成通过平行于和垂直于跟踪方向的表面中心的线，并且也在与前两行的角度为45度。通过推挽方法或外差法检测跟踪误差。根据信息是否被写入信息记录盘或从信息记录盘读取，两种方法组合并交替地切换到操作中。推挽方法使用沿跟踪方向设置的一对相对的分开的光接收表面，并且外差法使用两对相对的分开的表面，其相对于跟踪方向对角地或以45度的角度设置。

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