专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明公开

EP2264704A2 Optical information apparatus 审中-公开
标题翻译： Optische Informationsvorrichtung
公开(公告)号：EP2264704A2
公开(公告)日：2010-12-22
申请号：EP10010350.6
申请日：2003-08-25
申请人： Panasonic Corporation
发明人： Kadowaki, Shin-ichi , Sano, Kousei , Arai, Akihiro , Yasuda, Katsuhiko , Kamei, Tomotada , Yamamoto, Hiroaki , Yamasaki, Fumitomo
IPC分类号： G11B7/09
CPC分类号： G11B7/1381 , G11B7/0901 , G11B7/0903 , G11B7/0941 , G11B7/0943 , G11B7/0948 , G11B7/131 , G11B7/133 , G11B7/1353 , G11B7/13927 , G11B2007/0013
摘要： An optical information apparatus comprises an optical pick-up head including: a light source emitting a light beam; a diffraction unit receiving a beam emitted from the light source to generate a plurality of diffracted beams composed of a 0th order diffracted light beam and a 1st or higher order diffracted light beam; a condensing unit receiving the plurality of diffracted beams from the diffraction unit and condensing the beams onto an optical recording medium; a beam splitter receiving the plurality of beams reflected from the optical recording medium and splitting the beams; and a photodetector receiving the beams split by the beam splitter and outputting signals in accordance with amounts of the received light beams, wherein the 0th order diffraction light beam generated in the diffraction unit is set to be a main beam, and two 1st or higher order diffracted light beams generated in the diffraction unit are set to be a first sub-beam and a second sub-beam; the photodetector has a plurality of light-receiving portions; and the main beam, the first sub-beam, and the second sub-beam are received by the plurality of light-receiving portions, respectively. The apparatus further comprises a tracking error signal generator generating a tracking error signal for irradiating a desired track with a beam. The optical recording medium has an information recording surface for recording information, the optical recording medium has a reflective surface for reflecting the beam to a region other than the information recording surface when the beam is condensed onto the information recording surface, and guide grooves are formed on the optical recording medium. The optical recording medium has tracks for recording information, arranged substantially at a constant pitch, on the information recording surface, and the tracks are provided on the guide grooves or between the guide grooves. When the main beam is placed on the track, the first sub-beam and the second sub-beam are respectively placed between the tracks. The tracking error signal generator performs a differential arithmetic operation with respect to signals output from the light-receiving portion receiving the main beam to generate a first push-pull signal, performs a differential arithmetic operation with respect to signals output from the light-receiving portions receiving the first sub-beam and the second sub-beam to generate a second push-pull signal, and performs a differential arithmetic operation with respect to the first push-pull signal and the second push-pull signal to generate the tracking error signal. Regions in a vicinity of centers of the main beam, the first sub-beam, and the second sub-beam are split by providing the beam splitter in an optical path from the optical information recording medium to the photodetector, the first push-pull signal is generated without using the region in the vicinity of the center of the main beam, and the second push-pull signal is generated without using the regions in the vicinity of the centers of the first sub-beam and the second sub-beam.
摘要翻译：光学信息装置包括：光学拾取头，包括：发射光束的光源; 衍射单元，接收从光源发射的光束，以产生由0级衍射光束和1级或更高级衍射光束组成的多个衍射光束; 从所述衍射单元接收所述多个衍射光束并将光束聚光到光记录介质上的聚光单元; 分束器，其接收从光记录介质反射并分裂光束的多个光束; 以及光电检测器，其接收由分束器分割的光束，并且根据接收的光束的量输出信号，其中在衍射单元中产生的0级衍射光束被设置为主光束，并且两个1级或更高级在衍射单元中产生的衍射光束被设定为第一子光束和第二子光束; 光电检测器具有多个光接收部分; 并且主光束，第一子光束和第二子光束分别被多个光接收部分接收。该装置还包括产生跟踪误差信号的跟踪误差信号发生器，用于用光束照射期望的轨道。光记录介质具有用于记录信息的信息记录表面，当光束被聚集到信息记录表面上时，光记录介质具有用于将光束反射到信息记录表面以外的区域的反射表面，形成引导槽在光学记录介质上。光学记录介质具有用于在信息记录表面上基本上以恒定的间距记录信息的轨道，并且轨道设置在引导槽上或引导槽之间。当主光束被放置在轨道上时，第一子光束和第二子光束分别放置在轨道之间。跟踪误差信号发生器对从接收主波束的光接收部分输出的信号执行差分运算，产生第一推挽信号，对从光接收部分输出的信号执行差分运算接收第一子光束和第二子光束以产生第二推挽信号，并且相对于第一推挽信号和第二推挽信号执行差分运算以产生跟踪误差信号。通过在从光学信息记录介质到光电检测器的光路中提供分束器，将主光束，第一子光束和第二子光束的中心附近的区域分开，第一推挽信号在不使用主光束中心附近的区域的情况下产生，并且不使用第一子光束和第二子光束的中心附近的区域来生成第二推挽信号。

2. 发明公开

EP2264706A2 Optical pick-up head, optical information apparatus and optical information reproducing method 审中-公开
标题翻译： Optischer Abtastkopf，optischesInformationsgerät，und optisches Informationswiedergabeverfahren
公开(公告)号：EP2264706A2
公开(公告)日：2010-12-22
申请号：EP10010374.6
申请日：2003-08-25
申请人： Panasonic Corporation
发明人： Kadowaki, Shin-ichi , Sano, Kousei , Arai, Akihiro , Yasuda, Katsuhiko , Kamei, Tomotada , Yamamoto, Hiroaki , Yamasaki, Fumitomo
IPC分类号： G11B7/09
CPC分类号： G11B7/1381 , G11B7/0901 , G11B7/0903 , G11B7/0941 , G11B7/0943 , G11B7/0948 , G11B7/131 , G11B7/133 , G11B7/1353 , G11B7/13927 , G11B2007/0013
摘要： An optical information apparatus, comprises an optical pick-up head including: a light source emitting a light beam; a diffraction unit receiving a beam emitted from the light source to generate a plurality of diffracted beams composed of a 0th order diffracted light beam and a 1st or higher order diffracted light beam; a condensing unit receiving the plurality of diffracted beams from the diffraction unit and condensing the beams onto an optical recording medium; a beam splitter receiving the plurality of beams reflected from the optical recording medium and splitting the beams; and a photodetector receiving the beams split by the beam splitter and outputting signals in accordance with amounts of the received light beams, wherein the 0th order diffraction light beam generated in the diffraction unit is set to be a main beam, and two 1st or higher order diffracted light beams generated in the diffraction unit are set to be a first sub-beam and a second sub-beam; the photodetector has a plurality of light-receiving portions; and the main beam, the first sub-beam, and the second sub-beam are received by the plurality of light-receiving portions, respectively. The apparatus further comprises a tracking error signal generator generating a tracking error signal for irradiating a desired track with a beam. Guide grooves are formed on the optical recording medium, the optical recording medium has tracks for recording information, arranged substantially at a constant pitch, and the tracks are provided on the guide grooves or between the guide grooves. An average of the pitch is tp. When the main beam is placed on the track, the first sub-beam and the second sub-beam are respectively placed between the tracks. The tracking error signal generator performs a differential arithmetic operation with respect to signals output from the light-receiving portion receiving the main beam to generate a first push-pull signal, and performs a differential arithmetic operation with respect to signals output from the light-receiving portions receiving the first sub-beam and the second sub-beam to generate a second push-pull signal. An amplitude of the first push-pull signal obtained at the pitch tp when the light beam is scanned in a direction orthogonal to the tracks of the optical recording medium is changed at a pitch different from the pitch tp, due to a fact that a track in which information is not recorded is adjacent to a track in which information is recorded or that a pitch of the track formed on the optical recording medium is partially different from the pitch tp. The first push-pull signal is generated using a polarity or amplification coefficient k different from that of an arithmetic operation for obtaining an ordinary push-pull signal with respect to a region in a vicinity of a center of the main beam. The second push-pull signal is generated using a polarity or amplification coefficient k different from that of an arithmetic operation for obtaining an ordinary push-pull signal with respect to a region in a vicinity of respective centers of the first sub-beam and the second sub-beam. A differential arithmetic operation is performed with respect to the first push-pull signal and the second push-pull signal to generate the tracking error signal.
摘要翻译：一种光学信息设备，包括：光学拾取头，包括：发射光束的光源; 衍射单元，接收从光源发射的光束，以产生由0级衍射光束和1级或更高级衍射光束组成的多个衍射光束; 从所述衍射单元接收所述多个衍射光束并将光束聚光到光记录介质上的聚光单元; 分束器，其接收从光记录介质反射并分裂光束的多个光束; 以及光电检测器，其接收由分束器分割的光束，并且根据接收的光束的量输出信号，其中在衍射单元中产生的0级衍射光束被设置为主光束，并且两个1级或更高级在衍射单元中产生的衍射光束被设定为第一子光束和第二子光束; 光电检测器具有多个光接收部分; 并且主光束，第一子光束和第二子光束分别被多个光接收部分接收。该装置还包括产生跟踪误差信号的跟踪误差信号发生器，用于用光束照射期望的轨道。导光槽形成在光记录介质上，光记录介质具有用于记录信息的轨道，基本上以恒定的间距布置，并且轨迹设置在引导槽上或引导槽之间。平均音高是tp。当主光束被放置在轨道上时，第一子光束和第二子光束分别放置在轨道之间。跟踪误差信号发生器对从接收主波束的光接收部分输出的信号执行差分运算，产生第一推挽信号，并对从光接收信号输出的信号进行差分运算接收第一子光束和第二子光束以产生第二推挽信号的部分。在与光记录媒体的轨道正交的方向上扫描光束时，以间距tp获得的第一推挽信号的幅度以与音调tp不同的音调改变，这是由于轨道其中不记录信息与记录信息的轨迹相邻，或者在光记录介质上形成的轨迹的间距与间距tp有一些不同。使用与用于获得相对于主光束中心附近的区域的普通推挽信号的算术运算不同的极性或放大系数k来产生第一推挽信号。使用与用于获得关于第一子光束的各个中心附近的区域的普通推挽信号的算术运算的极性或放大系数k来生成第二推挽信号，子光束。对于第一推挽信号和第二推挽信号执行差分算术运算以产生跟踪误差信号。

3. 发明授权

EP1592001B1 Beam shaping lens, lens part, mounting plate, optical head, optical information recording and reproducing apparatus, computer, image recording and reproducing apparatus, image reproducing apparatus, server and car navigation system 有权转让
标题翻译：光束整形透镜，透镜安装板，光学头，光学信息记录和再现装置，电脑，视频记录和再现装置，图像再现装置，服务器和汽车导航系统
公开(公告)号：EP1592001B1
公开(公告)日：2010-09-22
申请号：EP05009136.2
申请日：2005-04-26
申请人： Panasonic Corporation
发明人： Tanaka, Toshiyasu , Komma, Yoshiaki , Sano, Kousei , Arai, Akihiro
IPC分类号： G11B7/125 , G11B7/135 , G11B7/22 , G02B3/06 , G02B7/02
CPC分类号： G11B7/1398 , G11B7/1378 , G11B7/13922 , G11B7/22 , G11B2007/13727

4. 发明公开

EP2264704A3 Optical information apparatus 审中-公开
标题翻译：光信息设备
公开(公告)号：EP2264704A3
公开(公告)日：2011-04-06
申请号：EP10010350.6
申请日：2003-08-25
申请人： Panasonic Corporation
发明人： Kadowaki, Shin-ichi , Sano, Kousei , Arai, Akihiro , Yasuda, Katsuhiko , Kamei, Tomotada , Yamamoto, Hiroaki , Yamasaki, Fumitomo
IPC分类号： G11B7/09
CPC分类号： G11B7/1381 , G11B7/0901 , G11B7/0903 , G11B7/0941 , G11B7/0943 , G11B7/0948 , G11B7/131 , G11B7/133 , G11B7/1353 , G11B7/13927 , G11B2007/0013
摘要： An optical information apparatus comprises an optical pick-up head including: a light source emitting a light beam; a diffraction unit receiving a beam emitted from the light source to generate a plurality of diffracted beams composed of a 0th order diffracted light beam and a 1st or higher order diffracted light beam; a condensing unit receiving the plurality of diffracted beams from the diffraction unit and condensing the beams onto an optical recording medium; a beam splitter receiving the plurality of beams reflected from the optical recording medium and splitting the beams; and a photodetector receiving the beams split by the beam splitter and outputting signals in accordance with amounts of the received light beams, wherein the 0th order diffraction light beam generated in the diffraction unit is set to be a main beam, and two 1st or higher order diffracted light beams generated in the diffraction unit are set to be a first sub-beam and a second sub-beam; the photodetector has a plurality of light-receiving portions; and the main beam, the first sub-beam, and the second sub-beam are received by the plurality of light-receiving portions, respectively. The apparatus further comprises a tracking error signal generator generating a tracking error signal for irradiating a desired track with a beam. The optical recording medium has an information recording surface for recording information, the optical recording medium has a reflective surface for reflecting the beam to a region other than the information recording surface when the beam is condensed onto the information recording surface, and guide grooves are formed on the optical recording medium. The optical recording medium has tracks for recording information, arranged substantially at a constant pitch, on the information recording surface, and the tracks are provided on the guide grooves or between the guide grooves. When the main beam is placed on the track, the first sub-beam and the second sub-beam are respectively placed between the tracks. The tracking error signal generator performs a differential arithmetic operation with respect to signals output from the light-receiving portion receiving the main beam to generate a first push-pull signal, performs a differential arithmetic operation with respect to signals output from the light-receiving portions receiving the first sub-beam and the second sub-beam to generate a second push-pull signal, and performs a differential arithmetic operation with respect to the first push-pull signal and the second push-pull signal to generate the tracking error signal. Regions in a vicinity of centers of the main beam, the first sub-beam, and the second sub-beam are split by providing the beam splitter in an optical path from the optical information recording medium to the photodetector, the first push-pull signal is generated without using the region in the vicinity of the center of the main beam, and the second push-pull signal is generated without using the regions in the vicinity of the centers of the first sub-beam and the second sub-beam.

5. 发明公开

EP2264705A2 Optical information apparatus and method for reproducing optical information using an optical pick-up head 审中-公开
标题翻译： OptischesInformationsgerätund einen optischen Abtastkopf verwendendes optisches Informationswiedergabeverfahren
公开(公告)号：EP2264705A2
公开(公告)日：2010-12-22
申请号：EP10010351.4
申请日：2003-08-25
申请人： Panasonic Corporation
发明人： Kadowaki, Shin-ichi , Sano, Kousei , Arai, Akihiro , Yasuda, Katsuhiko , Kamei, Tomotada , Yamamoto, Hiroaki , Yamasaki, Fumitomo
IPC分类号： G11B7/09
CPC分类号： G11B7/1381 , G11B7/0901 , G11B7/0903 , G11B7/0941 , G11B7/0943 , G11B7/0948 , G11B7/131 , G11B7/133 , G11B7/1353 , G11B7/13927 , G11B2007/0013
摘要： An optical information apparatus, comprises an optical pick-up head including: a light source emitting a light beam; a diffraction unit receiving a beam emitted from the light source to generate a plurality of diffracted beams composed of a 0th order diffracted light beam and a 1st or higher order diffracted light beam; a condensing unit receiving the plurality of diffracted beams from the diffraction unit and condensing the beams onto an optical recording medium; a beam splitter receiving the plurality of beams reflected from the optical recording medium and splitting the beams; and a photodetector receiving the beams split by the beam splitter and outputting signals in accordance with amounts of the received light beams, wherein the 0th order diffraction light beam generated in the diffraction unit is set to be a main beam, and two 1st or higher order diffracted light beams generated in the diffraction unit are set to be a first sub-beam and a second sub-beam. The photodetector has a plurality of light-receiving portions, and the main beam, the first sub-beam, and the second sub-beam are received by the plurality of light-receiving portions, respectively. The apparatus further comprises a tracking error signal generator generating a tracking error signal for irradiating a desired track with a beam. Guide grooves are formed on the optical recording medium, the optical recording medium has tracks for recording information, arranged substantially at a constant pitch, and the tracks are provided on the guide grooves or between the guide grooves. An average of the pitch is tp. Assuming that tracks irradiated with the main beam when the main beam is scanned in a direction orthogonal to the tracks are Tn-2, Tn-1, Tn, Tn+1, and Tn+2, and when the main beam is placed at a center of the track Tn, the first sub-beam is placed between the tracks Tn-2 and Tn-1, and the second sub-beam is placed between the tracks Tn+1 and Tn+2, the tracking error signal generator performs a differential arithmetic operation with respect to signals output from the light-receiving portion receiving the main beam to generate a first push-pull signal, performs a differential arithmetic operation with respect to signals output from the light-receiving portions receiving the first sub-beam and the second sub-beam to generate a second push-pull signal, an amplitude of the first push-pull signal obtained at the pitch tp when the light beam is scanned in a direction orthogonal to the tracks of the optical recording medium is changed at a pitch different from the pitch tp, due to a fact that a track in which information is not recorded is adjacent to a track in which information is recorded or that a pitch of the track formed on the optical recording medium is partially different from the pitch tp, and performs a differential arithmetic operation with respect to the first push-pull signal and the second push-pull signal to generate the tracking error signal.
摘要翻译：一种光学信息设备，包括：光学拾取头，包括：发射光束的光源; 衍射单元，接收从光源发射的光束，以产生由0级衍射光束和1级或更高级衍射光束组成的多个衍射光束; 从所述衍射单元接收所述多个衍射光束并将光束聚光到光记录介质上的聚光单元; 分束器，其接收从光记录介质反射并分裂光束的多个光束; 以及光电检测器，其接收由分束器分割的光束，并且根据接收的光束的量输出信号，其中在衍射单元中产生的0级衍射光束被设置为主光束，并且两个1级或更高级在衍射单元中产生的衍射光束被设置为第一子光束和第二子光束。光电检测器具有多个光接收部分，并且主光束，第一子光束和第二子光束分别被多个光接收部分接收。该装置还包括产生跟踪误差信号的跟踪误差信号发生器，用于用光束照射期望的轨道。导光槽形成在光记录介质上，光记录介质具有用于记录信息的轨道，基本上以恒定的间距布置，并且轨迹设置在引导槽上或引导槽之间。平均音高是tp。假设当主波束在与磁道正交的方向上被扫描时，用主波束照射的轨道是Tn-2，Tn-1，Tn，Tn + 1和Tn + 2，并且当主波束被放置在轨道Tn的中心，第一子光束被放置在轨道Tn-2和Tn-1之间，第二子光束被放置在轨道Tn + 1和Tn + 2之间，跟踪误差信号发生器执行相对于从接收主光束的光接收部分输出的信号进行微分算术运算以产生第一推挽信号，对从接收第一子光束的光接收部分输出的信号进行差分运算，所述第二子光束产生第二推挽信号，当在与所述光记录介质的轨迹正交的方向上扫描所述光束时以所述间距tp获得的所述第一推挽信号的幅度被改变为由于这个事实，音调与音高tp不同没有记录信息的轨道与记录信息的轨道相邻，或者在光记录介质上形成的轨道的间距部分地不同于间距tp，并且执行相对于第一推挽信号和第二推挽信号产生跟踪误差信号。

6. 发明授权

EP1632936B1 An optical head, an optical disk device and an integrated circuit 有权
标题翻译：一种光学头，光盘装置以及集成电路装置
公开(公告)号：EP1632936B1
公开(公告)日：2008-12-03
申请号：EP05014799.0
申请日：2005-07-07
申请人： Panasonic Corporation
发明人： Yamasaki, Fumitomo , Kadowaki, Shin-ichi , Sano, Kousei , Arai, Akihiro
IPC分类号： G11B7/00 , G11B7/095 , G11B7/13
CPC分类号： G11B7/0956 , G11B7/131 , G11B7/133

7. 发明公开

EP2264706A3 Optical pick-up head, optical information apparatus and optical information reproducing method 审中-公开
标题翻译：光学拾取器，光信息装置，以及光信息再生方法，
公开(公告)号：EP2264706A3
公开(公告)日：2011-04-13
申请号：EP10010374.6
申请日：2003-08-25
申请人： Panasonic Corporation
发明人： Kadowaki, Shin-ichi , Sano, Kousei , Arai, Akihiro , Yasuda, Katsuhiko , Kamei, Tomotada , Yamamoto, Hiroaki , Yamasaki, Fumitomo
IPC分类号： G11B7/09
CPC分类号： G11B7/1381 , G11B7/0901 , G11B7/0903 , G11B7/0941 , G11B7/0943 , G11B7/0948 , G11B7/131 , G11B7/133 , G11B7/1353 , G11B7/13927 , G11B2007/0013
摘要： An optical information apparatus, comprises an optical pick-up head including: a light source emitting a light beam; a diffraction unit receiving a beam emitted from the light source to generate a plurality of diffracted beams composed of a 0th order diffracted light beam and a 1st or higher order diffracted light beam; a condensing unit receiving the plurality of diffracted beams from the diffraction unit and condensing the beams onto an optical recording medium; a beam splitter receiving the plurality of beams reflected from the optical recording medium and splitting the beams; and a photodetector receiving the beams split by the beam splitter and outputting signals in accordance with amounts of the received light beams, wherein the 0th order diffraction light beam generated in the diffraction unit is set to be a main beam, and two 1st or higher order diffracted light beams generated in the diffraction unit are set to be a first sub-beam and a second sub-beam; the photodetector has a plurality of light-receiving portions; and the main beam, the first sub-beam, and the second sub-beam are received by the plurality of light-receiving portions, respectively. The apparatus further comprises a tracking error signal generator generating a tracking error signal for irradiating a desired track with a beam. Guide grooves are formed on the optical recording medium, the optical recording medium has tracks for recording information, arranged substantially at a constant pitch, and the tracks are provided on the guide grooves or between the guide grooves. An average of the pitch is tp. When the main beam is placed on the track, the first sub-beam and the second sub-beam are respectively placed between the tracks. The tracking error signal generator performs a differential arithmetic operation with respect to signals output from the light-receiving portion receiving the main beam to generate a first push-pull signal, and performs a differential arithmetic operation with respect to signals output from the light-receiving portions receiving the first sub-beam and the second sub-beam to generate a second push-pull signal. An amplitude of the first push-pull signal obtained at the pitch tp when the light beam is scanned in a direction orthogonal to the tracks of the optical recording medium is changed at a pitch different from the pitch tp, due to a fact that a track in which information is not recorded is adjacent to a track in which information is recorded or that a pitch of the track formed on the optical recording medium is partially different from the pitch tp. The first push-pull signal is generated using a polarity or amplification coefficient k different from that of an arithmetic operation for obtaining an ordinary push-pull signal with respect to a region in a vicinity of a center of the main beam. The second push-pull signal is generated using a polarity or amplification coefficient k different from that of an arithmetic operation for obtaining an ordinary push-pull signal with respect to a region in a vicinity of respective centers of the first sub-beam and the second sub-beam. A differential arithmetic operation is performed with respect to the first push-pull signal and the second push-pull signal to generate the tracking error signal.

8. 发明公开

EP2264705A3 Optical information apparatus and method for reproducing optical information using an optical pick-up head 审中-公开
标题翻译：的光信息装置，和光学拾光器用的光学信息再生方法，
公开(公告)号：EP2264705A3
公开(公告)日：2011-04-13
申请号：EP10010351.4
申请日：2003-08-25
申请人： Panasonic Corporation
发明人： Kadowaki, Shin-ichi , Sano, Kousei , Arai, Akihiro , Yasuda, Katsuhiko , Kamei, Tomotada , Yamamoto, Hiroaki , Yamasaki, Fumitomo
IPC分类号： G11B7/09
CPC分类号： G11B7/1381 , G11B7/0901 , G11B7/0903 , G11B7/0941 , G11B7/0943 , G11B7/0948 , G11B7/131 , G11B7/133 , G11B7/1353 , G11B7/13927 , G11B2007/0013
摘要： An optical information apparatus, comprises an optical pick-up head including: a light source emitting a light beam; a diffraction unit receiving a beam emitted from the light source to generate a plurality of diffracted beams composed of a 0th order diffracted light beam and a 1st or higher order diffracted light beam; a condensing unit receiving the plurality of diffracted beams from the diffraction unit and condensing the beams onto an optical recording medium; a beam splitter receiving the plurality of beams reflected from the optical recording medium and splitting the beams; and a photodetector receiving the beams split by the beam splitter and outputting signals in accordance with amounts of the received light beams, wherein the 0th order diffraction light beam generated in the diffraction unit is set to be a main beam, and two 1st or higher order diffracted light beams generated in the diffraction unit are set to be a first sub-beam and a second sub-beam. The photodetector has a plurality of light-receiving portions, and the main beam, the first sub-beam, and the second sub-beam are received by the plurality of light-receiving portions, respectively. The apparatus further comprises a tracking error signal generator generating a tracking error signal for irradiating a desired track with a beam. Guide grooves are formed on the optical recording medium, the optical recording medium has tracks for recording information, arranged substantially at a constant pitch, and the tracks are provided on the guide grooves or between the guide grooves. An average of the pitch is tp. Assuming that tracks irradiated with the main beam when the main beam is scanned in a direction orthogonal to the tracks are Tn-2, Tn-1, Tn, Tn+1, and Tn+2, and when the main beam is placed at a center of the track Tn, the first sub-beam is placed between the tracks Tn-2 and Tn-1, and the second sub-beam is placed between the tracks Tn+1 and Tn+2, the tracking error signal generator performs a differential arithmetic operation with respect to signals output from the light-receiving portion receiving the main beam to generate a first push-pull signal, performs a differential arithmetic operation with respect to signals output from the light-receiving portions receiving the first sub-beam and the second sub-beam to generate a second push-pull signal, an amplitude of the first push-pull signal obtained at the pitch tp when the light beam is scanned in a direction orthogonal to the tracks of the optical recording medium is changed at a pitch different from the pitch tp, due to a fact that a track in which information is not recorded is adjacent to a track in which information is recorded or that a pitch of the track formed on the optical recording medium is partially different from the pitch tp, and performs a differential arithmetic operation with respect to the first push-pull signal and the second push-pull signal to generate the tracking error signal.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式