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公开(公告)号：EP0323289A2
公开(公告)日：1989-07-05
申请号：EP88403062.8
申请日：1988-12-02
CPC分类号： G11B5/4886 , G11B17/32
摘要： A magnetic disc drive in which two magnetic heads (20, 30), each of which has at least two magnetic gaps (1, 2, 3, 4), are provided on a single carriage (10) and radially spaced apart from each other by a first predetermined distance (e). A radially inner one of the two magnetic heads (20) is tilted at a first predetermined angle (s) toward a rotary shaft (50) with which the magnetic disc is engaged, and a radially outer one of the two magnetic heads (30) is tilted at a second predetermined angle (t) away from the rotary shaft, thereby bringing the magnetic gaps provided on the inner and outer peripheral heads into contact with a recording/playback surface (61) of the magnetic disc (60) when the disc is rotated.
摘要翻译： 一种磁盘驱动器，其中两个磁头（20,30）中的每一个具有至少两个磁隙（1,2,3,4），设置在单个滑架（10）上并且彼此径向间隔开 第一预定距离（e）。 两个磁头20中的径向内侧的一个磁头以第一预定角度朝向与磁盘接合的旋转轴50倾斜，并且两个磁头30中的径向外侧的一个磁头朝向旋转轴50倾斜， 以远离旋转轴的第二预定角度（t）倾斜，从而当设置在内外周边头上的磁隙与磁盘（60）的记录/回放表面（61）接触时， 被旋转。
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公开(公告)号：EP0323320B1
公开(公告)日：1994-03-02
申请号：EP88403276.4
申请日：1988-12-21
CPC分类号： G11B7/1353 , G11B7/09
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公开(公告)号：EP0454854A4
公开(公告)日：1992-06-03
申请号：EP90914962
申请日：1990-10-15
IPC分类号： G11B7/09 , G11B7/13 , G11B11/105
CPC分类号： G11B11/10576 , G11B7/0912 , G11B7/093 , G11B7/0932 , G11B7/094 , G11B7/0943 , G11B7/13 , G11B7/133 , G11B11/105
摘要： A device for adjusting the focal point of an optical pickup device in which the light reflected by a recording medium is focused at points of two systems using an optical branching filter, first and second light detectors are disposed, respectively, in front of one focal point and at the back of the other focal point, and a focal point adjusting mechanism is servo-controlled in response to the outputs from the two light detectors. Each of the light detectors has a central light-receiving surface on the optical axis and a peripheral light-receiving surface in the periphery of the central light-receiving surface. According to a first method, the focal point adjusting mechanism is servo-controlled such that the deviation will become zero between the ratio of the amount of light received in the center to the total amount of light received in the center and periphery of the first light detector and the ratio of the amount of light in the center to the total amount of light in the center and periphery of the second light detector. Even if the two detectors receive different amounts of light, the difference is cancelled between the denominator and the numerator of the ratio of the amount of light in the center to the total amount of light in the center and periphery, and the device is not affected by the imbalance in the amount of light. According to a second method, the focal point adjusting mechanism is basically servo-controlled based on the difference between the amounts of light received in the centers of the two light detectors. Here, the difference in the total amount of light received by the two light detectors is calculated throughout all stages, and the difference is used to calculate a correction value multiplied by the component ratio of the amount of light in the center to the total amount of the light received in a focused condition. Since the calculated correction value is subtracted from the difference in the amount of light received in the centers, the servo output does not contain imbalance in the amount of light falling on the light detectors of the two systems, and the device is not affected by the imbalance in the amount of incident light.
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14.发明公开Optical pickup apparatus comprising a focus adjusting apparatus 失效GERÄTZUR FOKUSEINSTELLUNG EINER OPTISCHEN ABTASTEINHEIT。
公开(公告)号：EP0454854A1
公开(公告)日：1991-11-06
申请号：EP90914962.7
申请日：1990-10-15
IPC分类号： G11B7/09
CPC分类号： G11B11/10576 , G11B7/0912 , G11B7/093 , G11B7/0932 , G11B7/094 , G11B7/0943 , G11B7/13 , G11B7/133 , G11B11/105
摘要： A device for adjusting the focal point of an optical pickup device in which the light reflected by a recording medium is focused at points of two systems using an optical branching filter, first and second light detectors are disposed, respectively, in front of one focal point and at the back of the other focal point, and a focal point adjusting mechanism is servo-controlled in response to the outputs from the two light detectors. Each of the light detectors has a central light-receiving surface on the optical axis and a peripheral light-receiving surface in the periphery of the central light-receiving surface. According to a first method, the focal point adjusting mechanism is servo-controlled such that the deviation will become zero between the ratio of the amount of light received in the center to the total amount of light received in the center and periphery of the first light detector and the ratio of the amount of light in the center to the total amount of light in the center and periphery of the second light detector. Even if the two detectors receive different amounts of light, the difference is cancelled between the denominator and the numerator of the ratio of the amount of light in the center to the total amount of light in the center and periphery, and the device is not affected by the imbalance in the amount of light. According to a second method, the focal point adjusting mechanism is basically servo-controlled based on the difference between the amounts of light received in the centers of the two light detectors. Here, the difference in the total amount of light received by the two light detectors is calculated throughout all stages, and the difference is used to calculate a correction value multiplied by the component ratio of the amount of light in the center to the total amount of the light received in a focused condition. Since the calculated correction value is subtracted from the difference in the amount of light received in the centers, the servo output does not contain imbalance in the amount of light falling on the light detectors of the two systems, and the device is not affected by the imbalance in the amount of incident light.
摘要翻译： 焦点调整机构被伺服控制，使得在中心接收的光量与在第一光检测器的中心和周边接收的光的总量的比率之间的偏差将变为零，以及 中心的光量相对于第二检测器的中心和周边的总光量。 即使检测器接收到不同的光量，在中心和中心的总光量的比例的分母与分子之间的差异被抵消，并且该装置不受 光量不平衡。 或者，基于在两个检测器的中心中接收的光量之间的差异来对焦点调节机构进行伺服控制。 这里，在所有阶段都计算出由检测器接收的光的总安装量的差异，并且差异用于计算校正值乘以中心的光量与光的总安装量的分量比 在集中的情况下收到。 由于从中心接收的光量的差减去计算出的校正值，所以伺服输出不包含落在两个系统的检测器上的光量的不平衡，并且该装置不受不平衡的影响 在入射光量。 @（35pp Dwg.No.5 / 11）@。
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15.发明公开Optical head and tracking method using same 失效Optischer Kopf undSpurführsmethodeunter Benutzung desselben。
公开(公告)号：EP0323320A2
公开(公告)日：1989-07-05
申请号：EP88403276.4
申请日：1988-12-21
CPC分类号： G11B7/1353 , G11B7/09
摘要： An optical head (200) usable also for an WORM-type optical disk device includes a diffracting optical system (7, 8) which is located on the optical path of a light beam and which diffracts the light beam so as to produce at least three diffracted light beams, and three light-receiving elements which receive the reflected light beams of the three diffracted light beams from the surface of an optical disk. The diffracting optical system is arranged so as to establish a positional relationship in which the three or more diffracted light beams do not lie on a single straight line in the cross-sectional distribution thereof. Among the three diffracted light beams, one lying at the foremost or rearmost position in the forward rotating direction of the optical disk is employed for generating a focusing servo signal or for reading or writing data, and the remaining two are employed for generating a tracking servo signal.
摘要翻译： 也可用于WORM型光盘装置的光学头（200）包括位于光束的光路上并衍射光束以产生至少三个的衍射光学系统（7,8） 衍射光束和三个光接收元件，其从光盘的表面接收三个衍射光束的反射光束。 衍射光学系统被布置成在其横截面分布中建立三个或更多个衍射光束不位于单个直线上的位置关系。 在三个衍射光束中，一个位于光盘的正向旋转方向上的最前面或最后面的位置用于产生聚焦伺服信号或用于读取或写入数据，其余两个被用于产生跟踪伺服 信号。
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公开(公告)号：EP0591550B1
公开(公告)日：1998-03-18
申请号：EP93908115.4
申请日：1993-04-20
CPC分类号： G01D5/34792 , G01D5/2497 , H03M1/26
摘要： An absolute encoder comprises a moving member in which track groups (T2 and T1) consisting of a plurality of slit patterns bit-coded in accordance with digital code representing an absolute address such as a binary-coded quaternary code are parallelly arranged in a form from higher bits to lower bits; a light source for illuminating the member; photodetecting elements (1 and 2) which output detection signals (A0 to A3 ) for each track by receiving the illuminated light through the slit patterns; and processing means for processing the detected signals to generate bit reproducing signals (P0 to P3) and read the absolute addresses of the moving member by decoding. This processing means is provided with operating means (3 to 20) for generating the high order bit reproducing signals (P2 and P3) which are synchronized with the rising or falling of the low order bit reproducing signal (P0) by operating the low order detection signals (A0 to A0 ) obtained from the lower bit track (T1) and the high order detection signals (A2 to A3 ) obtained from the higher order bit track (T2). If the number of the tracks is increased, it is necessary to provide an arrangement in which the light which illuminates the lower order bit track is received through a magnifying optical system and at the same time, the light which illuminates the track on the high order bit side is received directly.
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公开(公告)号：EP0441709B1
公开(公告)日：1996-09-18
申请号：EP91400295.1
申请日：1991-02-07
发明人： Yoshikawa, Yukio , Ishii, Takeshi , Oyama, Yoshihiro , Sasaki, Tatsuo , Takahashi, Tamotsu , Sato, Shinichi , Moriya, Kazumasa , Shinoda, Ichiro , Itoh, Motohiko , Kashiwazaki, Tomoyuki , Kawai, Hiroaki , Watanabe, Mitsuo
CPC分类号： G06K7/10851 , G06K2207/1018 , H01S5/06825 , H01S5/06835
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公开(公告)号：EP0454854B1
公开(公告)日：1996-01-03
申请号：EP90914962.7
申请日：1990-10-15
IPC分类号： G11B7/09
CPC分类号： G11B11/10576 , G11B7/0912 , G11B7/093 , G11B7/0932 , G11B7/094 , G11B7/0943 , G11B7/13 , G11B7/133 , G11B11/105
摘要： A device for adjusting the focal point of an optical pickup device in which the light reflected by a recording medium is focused at points of two systems using an optical branching filter, first and second light detectors are disposed, respectively, in front of one focal point and at the back of the other focal point, and a focal point adjusting mechanism is servo-controlled in response to the outputs from the two light detectors. Each of the light detectors has a central light-receiving surface on the optical axis and a peripheral light-receiving surface in the periphery of the central light-receiving surface. According to a first method, the focal point adjusting mechanism is servo-controlled such that the deviation will become zero between the ratio of the amount of light received in the center to the total amount of light received in the center and periphery of the first light detector and the ratio of the amount of light in the center to the total amount of light in the center and periphery of the second light detector. Even if the two detectors receive different amounts of light, the difference is cancelled between the denominator and the numerator of the ratio of the amount of light in the center to the total amount of light in the center and periphery, and the device is not affected by the imbalance in the amount of light. According to a second method, the focal point adjusting mechanism is basically servo-controlled based on the difference between the amounts of light received in the centers of the two light detectors. Here, the difference in the total amount of light received by the two light detectors is calculated throughout all stages, and the difference is used to calculate a correction value multiplied by the component ratio of the amount of light in the center to the total amount of the light received in a focused condition. Since the calculated correction value is subtracted from the difference in the amount of light received in the centers, the servo output does not contain imbalance in the amount of light falling on the light detectors of the two systems, and the device is not affected by the imbalance in the amount of incident light.
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公开(公告)号：EP0578536A3
公开(公告)日：1994-12-21
申请号：EP93401668.4
申请日：1993-06-29
发明人： Kawaguchi, Eiji, c/o Copal Company Limited , Itoh, Katsuyoshi, c/o Fujitsu Limited , Imamura, Fuminori, c/o Fujitsu Limited
IPC分类号： G11B33/02 , G11B17/04 , G11B15/675
CPC分类号： G11B33/027 , G11B15/675 , G11B17/04 , G11B17/0405
摘要： The mechanism includes an apparatus for moving a cartridge (8) to perform insertion and ejection through an insertion/ejection opening for a recording and/or reproducing operation with respect to a medium incorporated in the cartridge. There is provided a panel main body (1) having an opening portion (1a) arranged near the insertion/ejection opening to guide the cartridge so as to allow the cartridge to move, a first door (2) including a pivot support portion (2a) having one end pivotally supported at one edge portion of the opening portion in a longitudinal direction thereof, and a lock portion (13), arranged near the pivot support portion, a first biasing spring (14) for biasing the first door toward the front surface of the panel main body to cover the opening portion. In addition, the apparatus is equipped with a second door (3) including a pivot support portion having one end pivotally supported near the edge portion and a locking portion arranged near the pivot support portion to lock with respect to the lock portion, and a second biasing spring (15, 16) for biasing the second door toward the rear surface of the panel main body to cover the opening portion.
摘要翻译： 该机构包括用于移动盒（8）以通过插入/弹出开口执行插入和弹出的装置，用于相对于结合在盒中的介质进行记录和/或复制操作。 提供一种面板主体（1），该面板主体具有布置在插入/弹出开口附近的开口部分（1a）以引导盒以允许盒移动;第一门（2），其包括枢转支撑部分（2a ），其一端可枢转地支撑在所述开口部分的纵向方向的一个边缘部分处;以及锁定部分（13），其布置在所述枢轴支撑部分附近，用于将所述第一门朝前方偏置的第一偏置弹簧（14） 面板主体的表面覆盖开口部。 另外，该设备配备有第二门（3），该第二门包括：枢转支撑部分，其一端枢转地支撑在边缘部分附近;以及锁定部分，布置在枢转支撑部分附近以相对于锁定部分锁定;以及第二门 偏压弹簧（15,16），用于朝向面板主体的后表面偏压第二门以覆盖开口部分。
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20.发明公开Opening/closing door mechanism and apparatus having the same 失效Tür-Öffnungs-/ Schliessungsmechanismus und damitausgerüstetesGerät。
公开(公告)号：EP0578536A2
公开(公告)日：1994-01-12
申请号：EP93401668.4
申请日：1993-06-29
发明人： Kawaguchi, Eiji, c/o Copal Company Limited , Itoh, Katsuyoshi, c/o Fujitsu Limited , Imamura, Fuminori, c/o Fujitsu Limited
IPC分类号： G11B33/02 , G11B17/04 , G11B15/675
CPC分类号： G11B33/027 , G11B15/675 , G11B17/04 , G11B17/0405
摘要： The mechanism includes an apparatus for moving a cartridge (8) to perform insertion and ejection through an insertion/ejection opening for a recording and/or reproducing operation with respect to a medium incorporated in the cartridge. There is provided a panel main body (1) having an opening portion (1a) arranged near the insertion/ejection opening to guide the cartridge so as to allow the cartridge to move, a first door (2) including a pivot support portion (2a) having one end pivotally supported at one edge portion of the opening portion in a longitudinal direction thereof, and a lock portion (13), arranged near the pivot support portion, a first biasing spring (14) for biasing the first door toward the front surface of the panel main body to cover the opening portion. In addition, the apparatus is equipped with a second door (3) including a pivot support portion having one end pivotally supported near the edge portion and a locking portion arranged near the pivot support portion to lock with respect to the lock portion, and a second biasing spring (15, 16) for biasing the second door toward the rear surface of the panel main body to cover the opening portion.
摘要翻译： 该机构包括用于移动盒（8）以通过插入/弹出开口移动盒（8）的装置，用于相对于结合在盒中的介质进行记录和/或再现操作。 提供了一种面板主体（1），其具有设置在插入/弹出开口附近的引导盒以便于使盒移动的开口部分（1a），包括枢轴支撑部分（2a）的第一门 ），其一端在开口部的纵向方向上的一个边缘部分处枢转地支撑;以及锁定部分（13），设置在枢转支撑部分附近，第一偏置弹簧（14）用于将第一门朝向前方 面板主体的表面以覆盖开口部分。 此外，该装置配备有第二门（3），第二门（3）包括枢转支撑部分，枢轴支撑部分的一端枢转地支撑在边缘部分附近;以及锁定部分，其布置在枢转支撑部分附近以相对于锁定部分锁定， 偏压弹簧（15,16），用于将第二门朝向面板主体的后表面偏压以覆盖开口部分。
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