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1. 发明授权

US07750276B2 Optical information detecting method, optical head, and optical disc apparatus utilizing plural photodetectors 有权
标题翻译：光信息检测方法，光头，利用多个光检测器的光盘装置
公开(公告)号：US07750276B2
公开(公告)日：2010-07-06
申请号：US11852361
申请日：2007-09-10
申请人： Harukazu Miyamoto , Hideharu Mikami , Takeshi Shimano
发明人： Harukazu Miyamoto , Hideharu Mikami , Takeshi Shimano
IPC分类号： G02B27/40
CPC分类号： G11B7/1356 , G11B7/005 , G11B7/13 , G11B2007/0013
摘要： In multilayer optical discs and high-speed optical discs, the amount of reproduction light per unit time greatly decreases and the reproduction signal quality (S/N) significantly drops due to the low effective reflectivity and the short read time of the medium. These problems are solved by causing reflected signal light from the optical disc and reference light, which is separated from the same light source and introduced into a detector without being shone onto the optical disc, to interference with each other on the detector. Detector outputs having four different interference states are simultaneously obtained, the interference states being displaced at intervals of 90° in terms of the phase relationship between the reference light and the signal. Based on a operation of the four detector outputs, a reproduction signal can be obtained that is stable at all times and amplified with high quality, even when there is an optical path length variation due to disc undulations.
摘要翻译：在多层光盘和高速光盘中，由于介质的有效反射率低和读取时间短，每单位时间的再现光量大大降低，再现信号质量（S / N）显着下降。这些问题通过使来自光盘的反射信号光和从相同光源分离并被引入检测器而不被照射到光盘上的参考光在检测器上彼此干涉来解决。同时获得具有四种不同干扰状态的检测器输出，以参考光和信号之间的相位关系为90°的间隔移位干涉状态。基于四个检测器输出的操作，即使当由于盘起伏而导致光程长度变化时，也可以始终获得稳定的高质量放大的再现信号。

2. 发明申请

US20090316539A1 OPTICAL HEAD AND OPTICAL DISK APPARATUS 有权
标题翻译：光头和光盘设备
公开(公告)号：US20090316539A1
公开(公告)日：2009-12-24
申请号：US12419421
申请日：2009-04-07
申请人： Hideharu Mikami , Harukazu Miyamoto , Takahiro Kurokawa
发明人： Hideharu Mikami , Harukazu Miyamoto , Takahiro Kurokawa
IPC分类号： G11B7/00
CPC分类号： G11B7/005 , G11B7/0956 , G11B7/1353 , G11B7/1356 , G11B7/1359 , G11B7/1367 , G11B7/1378 , G11B2007/0013
摘要： There are provided an interference type optical head and an optical disk apparatus, which have a signal amplification effect and which can be manufactured in sizes comparable to conventional optical heads. In an optical disk apparatus that performs signal amplification by making a light, which is used as a reference light without being irradiated on an optical disk and, interfere with reflected light from the optical disk, a corner cube prism that reflects the reference light is mounted on the same actuator as an objective lens. Further, there is provided a movable portion that adjusts the optical path length of the interfering light in accordance with the kind of optical disk being read and the recording layer being read. A wedge prism may be used for the movable portion, and a spherical aberration correction lens and an optical path length adjusting component may be moved integrally. Thus, a stable amplification effect may be obtained while keeping the overall size comparable to conventional apparatuses.
摘要翻译：提供了具有信号放大效果的干涉型光学头和光盘装置，其可以制造成与传统光学头相当的尺寸。在通过制造光而进行信号放大的光盘装置中，其被用作基准光而不被照射在光盘上并且干涉来自光盘的反射光，安装反射参考光的角立方棱镜在与物镜相同的致动器上。此外，提供了可移动部分，其根据正在读取的光盘的种类和正在读取的记录层来调节干涉光的光路长度。楔形棱镜可以用于可动部分，并且球面像差校正透镜和光程长度调节部件可以一体地移动。因此，可以获得稳定的放大效果，同时保持与常规设备相当的总体尺寸。

3. 发明授权

US08400898B2 Optical recording and reproducing apparatus 有权
标题翻译：光学记录和再现设备
公开(公告)号：US08400898B2
公开(公告)日：2013-03-19
申请号：US12893069
申请日：2010-09-29
申请人： Hideharu Mikami , Koichi Watanabe , Harukazu Miyamoto
发明人： Hideharu Mikami , Koichi Watanabe , Harukazu Miyamoto
IPC分类号： G11B7/00
CPC分类号： G11B7/0065 , G11B7/00781 , G11B7/128 , G11B7/24088
摘要： The present invention achieves an optical recording and reproducing apparatus focusing two opposed beams of light at a same place in an optical recording medium to record a standing wave generated by interference of the two beams of light. In the apparatus, phase information is recorded in the optical recording medium by a phase modulating means for modulating phase of one of the two beams of light. The reproduction reference light generated from a light source is allowed to interfere with reproduced light generated by projecting one of the two beams of light onto the optical recording medium to generate three or more beams of interfering light having different interference phases are simultaneously generated. The three or more beams of interfering light are then detected, and the phase modulated by the phase modulating means is demodulated from an output of the detector.
摘要翻译：本发明实现了在光记录介质中的相同位置聚焦两个相对的光束以记录由两束光的干涉产生的驻波的光学记录和再现装置。在该装置中，通过用于调制两束光之一的相位的相位调制装置将相位信息记录在光学记录介质中。从光源产生的再现参考光被允许同时产生通过将两个光束中的一个投影到光记录介质上而产生三个或更多个具有不同干涉相位的干涉光束的再生光。然后检测三个或更多个干涉光束，并且由相位调制装置调制的相位从检测器的输出解调。

4. 发明申请

US20080205246A1 OPTICAL HEAD AND OPTICAL DISK DEVICE 有权
标题翻译：光头和光盘设备
公开(公告)号：US20080205246A1
公开(公告)日：2008-08-28
申请号：US12025797
申请日：2008-02-05
申请人： Takeshi Shimano , Harukazu Miyamoto , Hideharu Mikami , Jiro Hashizume
发明人： Takeshi Shimano , Harukazu Miyamoto , Hideharu Mikami , Jiro Hashizume
IPC分类号： G11B7/135
CPC分类号： G11B7/1378 , G11B7/0903 , G11B7/1353 , G11B7/1356 , G11B7/1359
摘要： An interference type optical head and an optical disk device that can easily adjust an optical path length difference of a couple of lights, ensure higher signal amplification effect, and are suitable for reduction in size are provided in order to improve a regeneration signal quality with amplification of signal in the case where reflectivity of each layer must be lowered and relative noise for the signal increases because read speed is high in a multilayer optical disk. In view of essentially improving an S/N ratio of the regeneration signal in high-speed rotation of a multilayer disk, a plurality of interference phases are generated and an optical system for differential calculation has been reduced in size with an angular selective polarization conversion element in the optical disk device for amplifying the signal with interference of the light not radiated to the disk with the reflected light from the disk. Moreover, adjustment of reflection mirror angle of the reference light is no longer required by using a corner cube prism as the reference light reflection mirror and highly accurate signal detection can also be realized with a simplified structure.
摘要翻译：可以容易地调整两个光的光程长度差的干涉型光头和光盘装置，确保更高的信号放大效果，并且适合于减小尺寸，以便通过放大来提高再生信号质量在多层光盘中的读取速度高的情况下，必须降低每一层的反射率和信号的相对噪声的信号。鉴于在多层盘的高速旋转中基本上提高再生信号的S / N比，产生多个干涉相位，并且用角度选择偏振转换元件的差分计算用光学系统的尺寸减小了在光盘装置中，用于将没有辐射到盘的光的信号与来自盘的反射光放大的信号。此外，通过使用角隅棱镜作为参考光反射镜，不再需要对参考光的反射镜角度的调整，并且也可以以简化的结构实现高精度的信号检测。

5. 发明授权

US08659982B2 Optical information recording/reproducing apparatus and optical information reproducing apparatus 有权
标题翻译：光信息记录/再现装置和光信息再现装置
公开(公告)号：US08659982B2
公开(公告)日：2014-02-25
申请号：US12961571
申请日：2010-12-07
申请人： Hideharu Mikami , Harukazu Miyamoto
发明人： Hideharu Mikami , Harukazu Miyamoto
IPC分类号： G11B20/00 , G11B7/00 , G11B7/135 , G11B27/36
CPC分类号： G11B7/083 , G03H2001/0441 , G03H2210/562 , G11B7/00781 , G11B2007/00656
摘要： In a system of detecting an interference light with a light not irradiated onto an optical disc to increase the S/N ratio, it is difficult to stably acquire a reproduced signal with a simple configuration. Since the recording density is not improved, an improvement in transfer rate is difficult. In an optical information recording/reproducing apparatus where two optical beams face each other and are focused at the same place of a recording medium to record a standing wave developed by interference of the two optical beams, a phase difference of the two optical beams is modulated in a multiple stage and recorded. During reproduction, an interference light of a reproduced light from the recording medium and another reproduction reference light is detected as a reproduced signal, and a phase servo control stabilizing the phase of interference during reproduction by using a low frequency component of the reproduced signal is conducted.
摘要翻译：在利用未照射到光盘上的光来检测干涉光以提高S / N比的系统中，难以以简单的结构稳定地获取再生信号。由于记录密度没有改善，传输速率的提高是困难的。在其中两个光束彼此面对并聚焦在记录介质的相同位置以记录由两个光束的干涉产生的驻波的光信息记录/再现装置中，两个光束的相位差被调制在多个阶段并记录下来。在再现期间，检测来自记录介质的再现光的干涉光和另一个再现参考光作为再现信号，并且通过使用再现信号的低频分量来进行稳定再现期间的干扰相位的相位伺服控制。

6. 发明授权

US08098548B2 Optical head and optical disk apparatus 有权
标题翻译：光头和光盘装置
公开(公告)号：US08098548B2
公开(公告)日：2012-01-17
申请号：US12419421
申请日：2009-04-07
申请人： Hideharu Mikami , Harukazu Miyamoto , Takahiro Kurokawa
发明人： Hideharu Mikami , Harukazu Miyamoto , Takahiro Kurokawa
IPC分类号： G11B7/00
CPC分类号： G11B7/005 , G11B7/0956 , G11B7/1353 , G11B7/1356 , G11B7/1359 , G11B7/1367 , G11B7/1378 , G11B2007/0013
摘要： An interference type optical head and an optical disk apparatus which have a signal amplification effect and can be manufactured in sizes comparable to conventional optical heads. In an optical disk apparatus that performs signal amplification by making a light, which is used as a reference light without being irradiated on an optical disk and, interfere with reflected light from the optical disk, a corner cube prism that reflects the reference light is mounted on the same actuator as an objective lens. A movable portion adjusts the optical path length of the interfering light in accordance with the kind of optical disk being read and the recording layer being read. A wedge prism may be used for the movable portion, and a spherical aberration correction lens and an optical path length adjusting component may be moved integrally.
摘要翻译：具有信号放大效应的干涉型光头和光盘装置，其尺寸可与常规光头相当。在通过制造光而进行信号放大的光盘装置中，其被用作基准光而不被照射在光盘上并且干涉来自光盘的反射光，安装反射参考光的角立方棱镜在与物镜相同的致动器上。可移动部分根据正在读取的光盘的种类和读取的记录层来调节干涉光的光路长度。楔形棱镜可以用于可动部分，并且球面像差校正透镜和光程长度调节部件可以一体地移动。

7. 发明授权

US08023390B2 Optical head and optical disk device 有权
标题翻译：光头和光盘装置
公开(公告)号：US08023390B2
公开(公告)日：2011-09-20
申请号：US12025797
申请日：2008-02-05
申请人： Takeshi Shimano , Harukazu Miyamoto , Hideharu Mikami , Jiro Hashizume
发明人： Takeshi Shimano , Harukazu Miyamoto , Hideharu Mikami , Jiro Hashizume
IPC分类号： G11B7/135
CPC分类号： G11B7/1378 , G11B7/0903 , G11B7/1353 , G11B7/1356 , G11B7/1359
摘要： An interference type optical head and an optical disk device that can easily adjust an optical path length difference of a couple of lights, ensure higher signal amplification effect, and are suitable for reduction in size are provided in order to improve a regeneration signal quality with amplification of signal in the case where reflectivity of each layer must be lowered and relative noise for the signal increases because read speed is high in a multilayer optical disk. In view of essentially improving an S/N ratio of the regeneration signal in high-speed rotation of a multilayer disk, a plurality of interference phases are generated and an optical system for differential calculation has been reduced in size with an angular selective polarization conversion element in the optical disk device for amplifying the signal with interference of the light not radiated to the disk with the reflected light from the disk. Moreover, adjustment of reflection mirror angle of the reference light is no longer required by using a corner cube prism as the reference light reflection mirror and highly accurate signal detection can also be realized with a simplified structure.
摘要翻译：可以容易地调整两个光的光程长度差的干涉型光头和光盘装置，确保更高的信号放大效果，并且适合于减小尺寸，以便通过放大来提高再生信号质量在多层光盘中的读取速度高的情况下，必须降低每一层的反射率和信号的相对噪声的信号。鉴于在多层盘的高速旋转中基本上提高再生信号的S / N比，产生多个干涉相位，并且用角度选择偏振转换元件的差分计算用光学系统的尺寸减小了在光盘装置中，用于将没有辐射到盘的光的信号与来自盘的反射光放大的信号。此外，通过使用角隅棱镜作为参考光反射镜，不再需要对参考光的反射镜角度的调整，并且也可以以简化的结构实现高精度的信号检测。

8. 发明申请

US20080067321A1 OPTICAL INFORMATION DETECTING METHOD, OPTICAL HEAD, AND OPTICAL DISC APPARATUS 有权
标题翻译：光学信息检测方法，光学头和光盘设备
公开(公告)号：US20080067321A1
公开(公告)日：2008-03-20
申请号：US11852361
申请日：2007-09-10
申请人： HARUKAZU MIYAMOTO , Hideharu Mikami , Takeshi Shimano
发明人： HARUKAZU MIYAMOTO , Hideharu Mikami , Takeshi Shimano
IPC分类号： G02B27/40
CPC分类号： G11B7/1356 , G11B7/005 , G11B7/13 , G11B2007/0013
摘要： In multilayer optical discs and high-speed optical discs, the amount of reproduction light per unit time greatly decreases and the reproduction signal quality (S/N) significantly drops due to the low effective reflectivity and the short read time of the medium. These problems are solved by causing reflected signal light from the optical disc and reference light, which is separated from the same light source and introduced into a detector without being shone onto the optical disc, to interference with each other on the detector. Detector outputs having four different interference states are simultaneously obtained, the interference states being displaced at intervals of 90° in terms of the phase relationship between the reference light and the signal. Based on a operation of the four detector outputs, a reproduction signal can be obtained that is stable at all times and amplified with high quality, even when there is an optical path length variation due to disc undulations.
摘要翻译：在多层光盘和高速光盘中，由于介质的有效反射率低和读取时间短，每单位时间的再现光量大大降低，再现信号质量（S / N）显着下降。这些问题通过使来自光盘的反射信号光和从相同光源分离并被引入检测器而不被照射到光盘上的参考光在检测器上彼此干涉来解决。同时获得具有四种不同干扰状态的检测器输出，以参考光和信号之间的相位关系为90°的间隔移位干涉状态。基于四个检测器输出的操作，即使当由于盘起伏而导致光程长度变化时，也可以始终获得稳定的高质量放大的再现信号。

9. 发明授权

US08576677B2 Optical signal detecting circuit and information reproducing device using the same 失效
标题翻译：光信号检测电路及使用其的信息再现装置
公开(公告)号：US08576677B2
公开(公告)日：2013-11-05
申请号：US12420897
申请日：2009-04-09
申请人： Takahiro Kurokawa , Hideharu Mikami
发明人： Takahiro Kurokawa , Hideharu Mikami
IPC分类号： G11B7/00
CPC分类号： G11B7/13 , G01J1/4228 , G01J1/44 , G11B7/09 , G11B20/10009
摘要： An object of the present invention is to achieve both low noise and fast response in an optical signal detecting circuit capable of providing all of three signals—a focus error signal, a tracking error signal, and an RF signal—with only a single detection system. A single current-to-voltage converter converts a current signal obtained by adding currents flowing through two photodiodes, into a voltage signal. Not only currents flowing into the photodiodes, but also currents flowing out from the photodiodes are taken out as the voltage signals. Moreover, by applying two different reference voltages to the current-to-voltage converters, a reverse bias voltage is applied between the terminals of each photodiode.
摘要翻译：本发明的目的是在能够提供三个信号的光信号检测电路中实现低噪声和快速响应，即仅具有单个检测系统的聚焦误差信号，跟踪误差信号和RF信号。单个电流 - 电压转换器将通过将流过两个光电二极管的电流相加而获得的电流信号转换成电压信号。不仅流入光电二极管的电流，还有从光电二极管流出的电流作为电压信号被取出。此外，通过将两个不同的参考电压施加到电流 - 电压转换器，在每个光电二极管的端子之间施加反向偏置电压。

10. 发明申请

US20090257327A1 Optical Signal Detecting Circuit and Information Reproducing Device Using the Same 失效
标题翻译：光信号检测电路及其使用的信息再现装置
公开(公告)号：US20090257327A1
公开(公告)日：2009-10-15
申请号：US12420897
申请日：2009-04-09
申请人： Takahiro Kurokawa , Hideharu Mikami
发明人： Takahiro Kurokawa , Hideharu Mikami
IPC分类号： G11B7/00 , G11B7/12
CPC分类号： G11B7/13 , G01J1/4228 , G01J1/44 , G11B7/09 , G11B20/10009
摘要： An object of the present invention is to achieve both low noise and fast response in an optical signal detecting circuit capable of providing all of three signals—a focus error signal, a tracking error signal, and an RF signal—with only a single detection system. A single current-to-voltage converter converts a current signal obtained by adding currents flowing through two photodiodes, into a voltage signal. Not only currents flowing into the photodiodes, but also currents flowing out from the photodiodes are taken out as the voltage signals. Moreover, by applying two different reference voltages to the current-to-voltage converters, a reverse bias voltage is applied between the terminals of each photodiode.
摘要翻译：本发明的目的是在能够提供三个信号的光信号检测电路中实现低噪声和快速响应，即仅具有单个检测系统的聚焦误差信号，跟踪误差信号和RF信号。单个电流 - 电压转换器将通过将流过两个光电二极管的电流相加而获得的电流信号转换成电压信号。不仅流入光电二极管的电流，还有从光电二极管流出的电流作为电压信号被取出。此外，通过将两个不同的参考电压施加到电流 - 电压转换器，在每个光电二极管的端子之间施加反向偏置电压。

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