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1. 发明授权

US06292441B1 Optical head device, optical information apparatus, and method for detecting focus error signal 失效
标题翻译：光头装置，光信息装置以及聚焦误差信号检测方法
公开(公告)号：US06292441B1
公开(公告)日：2001-09-18
申请号：US09061822
申请日：1998-04-16
申请人： Hiroaki Yamamoto , Daisuke Ogata , Ken'ichi Kasazumi , Seiji Nishino , Hidenori Wada , Sadao Mizuno
发明人： Hiroaki Yamamoto , Daisuke Ogata , Ken'ichi Kasazumi , Seiji Nishino , Hidenori Wada , Sadao Mizuno
IPC分类号： G11B700
CPC分类号： G11B7/131 , G11B7/0908 , G11B7/094 , G11B7/1353 , G11B7/1381
摘要： An optical head device includes a light source for emitting a light beam having a predetermined wavelength, an optical system for converging the light beam emitted from the light source on an information medium, and a light detector for receiving the light beam reflected from the information medium and detecting a focus error signal based on the received light beam. The light detector includes a plurality of pairs of photodetectors. The light detector generates the focus error signal based on a differential signal generated by each pair of the plurality of pairs of photodetectors. The plurality of pairs of photodetectors are arranged so that a fluctuation in the differential signal generated by at least one of the pairs of the plurality of pairs of photodetectors is cancelled by a fluctuation in the differential signal generated by at least another of the pairs of the plurality of pairs of photodetectors.
摘要翻译：光头装置包括用于发射具有预定波长的光束的光源，用于将从光源发射的光束会聚在信息介质上的光学系统，以及用于接收从信息介质反射的光束的光检测器以及基于所接收的光束检测聚焦误差信号。光检测器包括多对光电检测器。光检测器基于由每对多个光电检测器生成的差分信号产生聚焦误差信号。多对光检测器被布置成使得由多对光检测器中的至少一对成对的光检测器产生的差分信号的波动被由至少另一对成对的光检测器产生的差分信号的波动所抵消多对光电探测器。

2. 发明授权

US06418107B1 Optical head device, inclination detection apparatus using the same, and optical information processing apparatus using the same 有权
标题翻译：光头装置，使用该装置的倾斜检测装置以及使用该装置的光信息处理装置
公开(公告)号：US06418107B1
公开(公告)日：2002-07-09
申请号：US09641813
申请日：2000-08-17
申请人： Kousei Sano , Shin-ichi Kadowaki , Hiroaki Yamamoto , Ken'ichi Kasazumi , Seiji Nishino
发明人： Kousei Sano , Shin-ichi Kadowaki , Hiroaki Yamamoto , Ken'ichi Kasazumi , Seiji Nishino
IPC分类号： G11B700
CPC分类号： G11B7/1381 , G11B7/0943 , G11B7/0953 , G11B7/0956 , G11B7/131
摘要： An optical head device includes a light source for emitting at least one of a coherent beam and a quasi-monochromatic beam; a collection optical system for collecting the beam to an information memory medium having a track which has at least one mark and at least one space; a light detector having a plurality of detection areas for receiving the beam reflected by the information memory medium and outputting a signal in accordance with a light amount of the beam received; and a tracking error signal generator for receiving the signals output from the light detector and generating a tracking error signal based on the signals. The tracking error signal generator reduces a difference between a first signal amplitude and a second signal amplitude. The first signal amplitude is an absolute value of a difference between first and second signal levels. The second signal amplitude is an absolute value of a difference between the first and third signal levels. The first signal level is a value of the tracking error signal obtained when the beam emitted by the light source is radiated to a center of the track. The second and third signal levels are, respectively, a maximum value and a minimum value of the tracking error signal obtained when the information memory medium is scanned by the beam emitted by the light source in a direction perpendicular to the track.
摘要翻译：光头装置包括用于发射相干光束和准单色光束中的至少一个的光源; 收集光学系统，用于将光束收集到具有至少一个标记和至少一个空间的轨道的信息存储介质; 具有多个检测区域的光检测器，用于接收由信息存储介质反射的光束并根据所接收的光束的光量输出信号; 以及跟踪误差信号发生器，用于接收从光检测器输出的信号，并基于该信号产生跟踪误差信号。跟踪误差信号发生器减小第一信号幅度和第二信号幅度之间的差。第一信号幅度是第一和第二信号电平之差的绝对值。第二信号幅度是第一和第三信号电平之间的差的绝对值。第一信号电平是当由光源发射的光束被辐射到轨道的中心时获得的跟踪误差信号的值。第二和第三信号电平分别是当信息存储介质被光源在与光道垂直的方向上发射的光束扫描时获得的跟踪误差信号的最大值和最小值。

3. 发明授权

US5737296A Focus and tracking error detection by using plus and minus first order diffracted light 失效
$Focus and tracking error detection by using plus and minus first order diffracted light$
标题翻译：通过使用正负衍射光进行对焦和跟踪误差检测
公开(公告)号：US5737296A
公开(公告)日：1998-04-07
申请号：US589883
申请日：1996-01-23
申请人： Yoshiaki Komma , Ken'ichi Kasazumi , Seiji Nishino , Hiroaki Yamamoto
发明人： Yoshiaki Komma , Ken'ichi Kasazumi , Seiji Nishino , Hiroaki Yamamoto
IPC分类号： G11B7/09 , G11B7/12 , G11B7/13 , G11B7/135 , G11B7/00
CPC分类号： G11B7/1353 , G11B7/0903 , G11B7/0912 , G11B7/123 , G11B7/131 , G11B7/0943
摘要： An optical head device includes a light source for emitting light; an optical system for focusing the light emitted by the light source onto an information medium to form a light spot; a photodetector including a plurality of light detection areas for receiving the light reflected by the information medium and for outputting photocurrents in accordance with the respective amount of the light received; a holographic optical element for diffracting the light reflected by the information medium and for directing the light to the photodetector; and a signal processing circuit section for obtaining a focusing error signal and a tracking error signal for controlling the light spot using the photocurrents. The signal processing circuit section obtains the focusing error signal from the photocurrents which are obtained in accordance with the amount of light of one of .+-.Nth-order diffracted beams, and obtains the tracking error signal from the photocurrents which are obtained in accordance with the amount of light of the other of the .+-.Nth-order diffracted beams.
摘要翻译：光头装置包括用于发光的光源; 用于将由光源发射的光聚焦到信息介质上以形成光点的光学系统; 光检测器，其包括多个光检测区域，用于接收由信息介质反射的光并根据所接收的光的相应量输出光电流; 全息光学元件，用于衍射由信息介质反射的光并将光引导到光电检测器; 以及信号处理电路部分，用于获得聚焦误差信号和用于使用光电流来控制光点的跟踪误差信号。信号处理电路部分从根据+/- N次衍射光束之一的光量获得的光电流获得聚焦误差信号，并从根据光电流获得的光电流获得跟踪误差信号 +/- N次衍射光束中的另一个的光量。

4. 发明授权

US06882607B2 Optical head device and method for processing information based on prescribed division areas 失效
标题翻译：光头装置和基于规定分区的信息处理方法
公开(公告)号：US06882607B2
公开(公告)日：2005-04-19
申请号：US10691327
申请日：2003-10-22
申请人： Kousei Sano , Shin-ichi Kadowaki , Hiroaki Yamamoto , Ken'ichi Kasazumi , Seiji Nishino
发明人： Kousei Sano , Shin-ichi Kadowaki , Hiroaki Yamamoto , Ken'ichi Kasazumi , Seiji Nishino
IPC分类号： G11B7/09 , G11B7/095 , G11B7/13 , G11B7/135 , G11B7/00
CPC分类号： G11B7/1353 , G11B7/0943 , G11B7/0953 , G11B7/0956 , G11B7/131 , G11B7/1381 , G11B2007/13727
摘要： An optical head device includes a light source for emitting light; a collection optical system for collecting the light emitted by the light source to an information memory medium including at least one of a track having a mark or a space selectively arranged, and a track having a prescribed groove; a light detector having a plurality of detection areas for receiving the light reflected by the information memory medium and outputting a signal in accordance with a light amount of the light received; a division element for dividing the light reflected by the information memory medium and allowing the light to be received by the light detector; a switch element for receiving a first signal and a second signal, which are respectively obtained in accordance with the reflected light incident on a first prescribed area and a second prescribed area of the division element and outputting either one of the first signal or the second signal, the first and second prescribed areas being obtained by dividing the division element along at least one division line; and an information reproduction signal generator for receiving the signal output by the switch element and generating information recorded on the track. The switch element outputs either one of the first signal and the second signal in accordance with a distance and a positional relationship between a light collection point of the light output from the collection light system and the track.
摘要翻译：光头装置包括用于发光的光源; 收集光学系统，用于将由光源发射的光收集到信息存储介质中，所述信息存储介质包括具有选择性排列的标记或空间的轨道和具有规定槽的轨道中的至少一个; 具有多个检测区域的光检测器，用于接收由信息存储介质反射的光并根据所接收的光的光量输出信号; 分割元件，用于分割由信息存储介质反射的光并允许光被光检测器接收; 用于接收第一信号和第二信号的开关元件，它们分别根据入射在分割元件的第一规定区域和第二规定区域上的反射光获得并输出第一信号或第二信号所述第一规定区域和所述第二规定区域通过沿着至少一个分割线划分所述分割单元而获得; 以及信息再现信号发生器，用于接收由开关元件输出的信号并产生记录在轨道上的信息。开关元件根据从收集光系统输出的光的光收集点和轨道之间的距离和位置关系，输出第一信号和第二信号中的任一个。

5. 发明授权

US06744707B1 Optical head device, inclination detection apparatus using the same, and optical information processing apparatus using the same 失效
标题翻译：光头装置，使用该装置的倾斜检测装置以及使用该装置的光信息处理装置
公开(公告)号：US06744707B1
公开(公告)日：2004-06-01
申请号：US09288304
申请日：1999-04-08
申请人： Kousei Sano , Shin-ichi Kadowaki , Hiroaki Yamamoto , Ken'ichi Kasazumi , Seiji Nishino
发明人： Kousei Sano , Shin-ichi Kadowaki , Hiroaki Yamamoto , Ken'ichi Kasazumi , Seiji Nishino
IPC分类号： G11B700
CPC分类号： G11B7/1353 , G11B7/0943 , G11B7/0953 , G11B7/0956 , G11B7/131 , G11B7/1381 , G11B2007/13727
摘要： An optical head device includes a light source for emitting light; a collection optical system for collecting the light emitted by the light source to an information memory medium including at least one of a track having a mark or a space selectively arranged, and a track having a prescribed groove; a light detector having a plurality of detection areas for receiving the light reflected by the information memory medium and outputting a signal in accordance with a light amount of the light received; a division element for dividing the light reflected by the information memory medium and allowing the light to be received by the light detector; a switch element for receiving a first signal and a second signal, which are respectively obtained in accordance with the reflected light incident on a first prescribed area and a second prescribed area of the division element and outputting either one of the first signal or the second signal, the first and second prescribed areas being obtained by dividing the division element along at least one division line, and an information reproduction signal generator for receiving the signal output by the switch element and generating information recorded on the track. The switch element outputs either one of the first signal and the second signal in accordance with a distance and a positional relationship between a light collection point of the light output from the collection light system and the track.
摘要翻译：光头装置包括用于发光的光源; 收集光学系统，用于将由光源发射的光收集到信息存储介质中，所述信息存储介质包括具有选择性排列的标记或空间的轨道和具有规定槽的轨道中的至少一个; 具有多个检测区域的光检测器，用于接收由信息存储介质反射的光并根据所接收的光的光量输出信号; 分割元件，用于分割由信息存储介质反射的光并允许光被光检测器接收; 用于接收第一信号和第二信号的开关元件，它们分别根据入射在分割元件的第一规定区域和第二规定区域上的反射光获得并输出第一信号或第二信号通过沿着至少一个分割线分割分割单元获得第一和第二规定区域，以及信息再现信号发生器，用于接收由开关元件输出的信号并产生记录在轨道上的信息。开关元件根据从收集光系统输出的光的光收集点和轨道之间的距离和位置关系，输出第一信号和第二信号中的任一个。

6. 发明授权

US06327231B1 Optical head device with zero-cross point correction 有权
标题翻译：具有零交叉点校正的光头设备
公开(公告)号：US06327231B1
公开(公告)日：2001-12-04
申请号：US09640702
申请日：2000-08-17
申请人： Kousei Sano , Shin-ichi Kadowaki , Hiroaki Yamamoto , Ken'ichi Kasazumi , Seiji Nishino
发明人： Kousei Sano , Shin-ichi Kadowaki , Hiroaki Yamamoto , Ken'ichi Kasazumi , Seiji Nishino
IPC分类号： G11B700
CPC分类号： G11B7/1381 , G11B7/0943 , G11B7/0953 , G11B7/0956 , G11B7/131
摘要： An optical head device includes a light source for emitting at least one of a coherent beam and a quasi-monochromatic beam; a collection optical system for collecting the beam to an information memory medium having a track which has at least one mark and at least one space; a light detector having a plurality of detection areas for receiving the beam reflected by the information memory medium and outputting a signal in accordance with a light amount of the beam received; and a tracking error signal generator for receiving the signals output from the light detector and generating a tracking error signal based on the signals. The tracking error signal generator reduces a difference between a first signal amplitude and a second signal amplitude. The first signal amplitude is an absolute value of a difference between first and second signal levels. The second signal amplitude is an absolute value of a difference between the first and third signal levels. The first signal level is a value of the tracking error signal obtained when the beam emitted by the light source is radiated to a center of the track. The second and third signal levels are, respectively, a maximum value and a minimum value of the tracking error signal obtained when the information memory medium is scanned by the beam emitted by the light source in a direction perpendicular to the track.
摘要翻译：光头装置包括用于发射相干光束和准单色光束中的至少一个的光源; 收集光学系统，用于将光束收集到具有至少一个标记和至少一个空间的轨道的信息存储介质; 具有多个检测区域的光检测器，用于接收由信息存储介质反射的光束并根据所接收的光束的光量输出信号; 以及跟踪误差信号发生器，用于接收从光检测器输出的信号，并基于该信号产生跟踪误差信号。跟踪误差信号发生器减小第一信号幅度和第二信号幅度之间的差。第一信号幅度是第一和第二信号电平之差的绝对值。第二信号幅度是第一和第三信号电平之间的差的绝对值。第一信号电平是当由光源发射的光束被辐射到轨道的中心时获得的跟踪误差信号的值。第二和第三信号电平分别是当信息存储介质被光源在与光道垂直的方向上发射的光束扫描时获得的跟踪误差信号的最大值和最小值。

7. 发明授权

US06314068B1 Optical head device, inclination detection apparatus using the same, and optical information processing apparatus using the same 有权
标题翻译：光头装置，使用该装置的倾斜检测装置以及使用该装置的光信息处理装置
公开(公告)号：US06314068B1
公开(公告)日：2001-11-06
申请号：US09640769
申请日：2000-08-17
申请人： Kousei Sano , Shin-ichi Kadowaki , Hiroaki Yamamoto , Ken'ichi Kasazumi , Seiji Nishino
发明人： Kousei Sano , Shin-ichi Kadowaki , Hiroaki Yamamoto , Ken'ichi Kasazumi , Seiji Nishino
IPC分类号： G11B700
CPC分类号： G11B7/1381 , G11B7/0943 , G11B7/0953 , G11B7/0956 , G11B7/131
摘要： An inclination detection apparatus is provided which includes an optical system for collecting a beam emitted by a light source onto an information memory medium. The inclination detection apparatus further includes a light detector for generating a detection signal in accordance with a light amount of the beam reflected by the information memory medium, the light detector including a first light receiving section and a second light receiving section. In addition, the inclination detection apparatus includes a signal processing section for processing the detection signal. The signal processing section generates an inclination detection signal based on a difference between a first sum signal and a second sum signal, the first sum signal being based on a sum of a first light receiving section signal and a second light receiving section signal, the second sum signal being based on a sum of a third light receiving section signal and a fourth light receiving section signal. Moreover, the signal processing section generates a tracking error signal based on a difference between a fifth light receiving section signal and a sixth light receiving section signal.
摘要翻译：提供了一种倾斜检测装置，其包括用于将由光源发射的光束收集到信息存储介质上的光学系统。倾斜检测装置还包括光检测器，用于根据由信息存储介质反射的光束的光量产生检测信号，光检测器包括第一光接收部分和第二光接收部分。此外，倾斜检测装置包括用于处理检测信号的信号处理部。信号处理部分基于第一和信号和第二和信号之间的差产生倾斜检测信号，第一和信号基于第一光接收部分信号和第二光接收部分信号的和，第二和和信号基于第三光接收部分信号和第四光接收部分信号的和。此外，信号处理部分基于第五光接收部分信号和第六光接收部分信号之间的差产生跟踪误差信号。

8. 发明授权

US07203138B2 Optical head device, inclination detection apparatus using the same, and optical information processing apparatus using the same 有权
标题翻译：光头装置，使用该装置的倾斜检测装置以及使用该装置的光信息处理装置
公开(公告)号：US07203138B2
公开(公告)日：2007-04-10
申请号：US10691317
申请日：2003-10-22
申请人： Kousei Sano , Shin-ichi Kadowaki , Hiroaki Yamamoto , Ken'ichi Kasazumi , Seiji Nishino
发明人： Kousei Sano , Shin-ichi Kadowaki , Hiroaki Yamamoto , Ken'ichi Kasazumi , Seiji Nishino
IPC分类号： G11B7/00
CPC分类号： G11B7/131 , G11B7/0943 , G11B7/0953 , G11B7/0956 , G11B7/1353 , G11B2007/13727
摘要： An optical head device includes a light source for emitting light; a collection optical system for collecting the light emitted by the light source to an information memory medium including tracks having prescribed grooves; a light detector having a plurality of detection areas for receiving the light reflected by the information memory medium and outputting a signal in accordance with a light amount of the light received; a tracking error signal generator for receiving the signals output from the light detector and generating a tracking error signal based on the signals; and a light division element for dividing a reflected light reflected by the information memory medium. A relationship λ/(NA·Tp)≧1 is satisfied where λ is the wavelength of the light emitted from the light source, NA is the numerical aperture of the collection optical system, and Tp is the distance from a center of the track in the information memory medium to a center of the adjacent track; and the tracking error signal generator generates a tracking error signal from an area except for an overlapping area of the reflected light, the overlapping area being an area of overlapping two circles each having a radius of 1 and having a center of one circle being apart from a center of the reflected light beam at a distance of λ/(NA·2Tp) in a direction orthogonal to the track from a center of a cross-section of the reflected light, when the cross-section of the reflected light on the light division element in a circle having a radius of 1.
摘要翻译：光头装置包括用于发光的光源; 收集光学系统，用于将由光源发射的光收集到包括具有规定凹槽的轨道的信息存储介质; 具有多个检测区域的光检测器，用于接收由信息存储介质反射的光并根据所接收的光的光量输出信号; 跟踪误差信号发生器，用于接收从光检测器输出的信号并基于该信号产生跟踪误差信号; 以及用于分割由信息存储介质反射的反射光的光分离元件。满足λ/（NA.Tp）> = 1的关系，其中λ是从光源发射的光的波长，NA是收集光学系统的数值孔径，Tp是从轨道的中心的距离在信息存储介质中到相邻轨道的中心; 并且跟踪误差信号发生器从除了反射光的重叠区域之外的区域产生跟踪误差信号，重叠区域是具有半径为1并且具有一个圆的中心的两个圆的重叠区域在反射光的横截面的中心处，在与轨道正交的方向上的距离λ/（NA.2Tp）处的反射光束的中心，当反射光的横截面半径为1的圆的分割元素。

9. 发明授权

US06665257B2 Optical head device, inclination detection apparatus using the same, and optical information processing apparatus using the same 有权
标题翻译：光头装置，使用该装置的倾斜检测装置以及使用该装置的光信息处理装置
公开(公告)号：US06665257B2
公开(公告)日：2003-12-16
申请号：US09761072
申请日：2001-01-15
申请人： Kousei Sano , Shin-ichi Kadowaki , Hiroaki Yamamoto , Ken'ichi Kasazumi , Seiji Nishino
发明人： Kousei Sano , Shin-ichi Kadowaki , Hiroaki Yamamoto , Ken'ichi Kasazumi , Seiji Nishino
IPC分类号： G11B700
CPC分类号： G11B7/0943 , G11B7/0953 , G11B7/0956 , G11B7/131 , G11B7/1381
摘要： An optical head device includes a light source for emitting light; a collection optical system for collecting the light emitted by the light source to an information memory medium including at least one of a track having a mark or a space selectively arranged, and a track having a prescribed groove; a light detector having a plurality of detection areas for receiving the light reflected by the information memory medium and outputting a signal in accordance with a light amount of the light received; a division element for dividing the light reflected by the information memory medium and allowing the light to be received by the light detector; a switch element for receiving a first signal and a second signal, which are respectively obtained in accordance with the reflected light incident on a first prescribed area and a second prescribed area of the division element and outputting either one of the first signal or the second signal, the first and second prescribed areas being obtained by dividing the division element along at least one division line; and an information reproduction signal generator for receiving the signal output by the switch element and generating information recorded on the track. The switch element outputs either one of the first signal and the second signal in accordance with a distance and e positional relationship between a light collection point of the light output from the collection light system and the track.
摘要翻译：光头装置包括用于发光的光源; 收集光学系统，用于将由光源发射的光收集到信息存储介质中，所述信息存储介质包括具有选择性排列的标记或空间的轨道和具有规定槽的轨道中的至少一个; 具有多个检测区域的光检测器，用于接收由信息存储介质反射的光并根据所接收的光的光量输出信号; 分割元件，用于分割由信息存储介质反射的光并允许光被光检测器接收; 用于接收第一信号和第二信号的开关元件，它们分别根据入射在分割元件的第一规定区域和第二规定区域上的反射光获得并输出第一信号或第二信号所述第一规定区域和所述第二规定区域通过沿着至少一个分割线划分所述分割单元而获得; 以及信息再现信号发生器，用于接收由开关元件输出的信号并产生记录在轨道上的信息。开关元件根据从收集光系统输出的光的光收集点与轨道之间的距离和e位置关系，输出第一信号和第二信号中的任一个。

10. 发明授权

US06418095B1 Optical head device, inclination detection apparatus using the same, and optical information processing apparatus using the same 失效
公开(公告)号：US06418095B1
公开(公告)日：2002-07-09
申请号：US08877363
申请日：1997-06-17
申请人： Kousei Sano , Shin-ichi Kadowaki , Hiroaki Yamamoto , Ken'ichi Kasazumi , Seiji Nishino
发明人： Kousei Sano , Shin-ichi Kadowaki , Hiroaki Yamamoto , Ken'ichi Kasazumi , Seiji Nishino
IPC分类号： G11B700
CPC分类号： G11B7/1381 , G11B7/0943 , G11B7/0953 , G11B7/0956 , G11B7/131
摘要： An optical head device includes a light source for emitting at least one of a coherent beam and a quasi-monochromatic beam; a collection optical system for collecting the beam to an information memory medium having a track which has at least one mark and at least one space; a light detector having a plurality of detection areas for receiving the beam reflected by the information memory medium and outputting a signal in accordance with a light amount of the beam received; and a tracking error signal generator for receiving the signals output from the light detector and generating a tracking error signal based on the signals. The tracking error signal generator reduces a difference between a first signal amplitude and a second signal amplitude. The first signal amplitude is an absolute value of a difference between first and second signal levels. The second signal amplitude is an absolute value of a difference between the first and third signal levels. The first signal level is a value of the tracking error signal obtained when the beam emitted by the light source is radiated to a center of the track. The second and third signal levels are, respectively, a maximum value and a minimum value of the tracking error signal obtained when the information memory medium is scanned by the beam emitted by the light source in a direction perpendicular to the track.

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