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1. 发明授权

US5648951A Movable optical head integrally incorporated with objective lens and hologram element 失效
标题翻译：整体结合物镜和全息元件的可移动光学头
公开(公告)号：US5648951A
公开(公告)日：1997-07-15
申请号：US415764
申请日：1995-04-03
申请人： Makoto Kato , Yoshiaki Komma , Shin-ichi Kadowaki , Yoshikazu Hori , Seiji Nishino , Tetsuo Saimi
发明人： Makoto Kato , Yoshiaki Komma , Shin-ichi Kadowaki , Yoshikazu Hori , Seiji Nishino , Tetsuo Saimi
IPC分类号： G02B5/18 , G02B5/32 , G02B27/00 , G11B7/09 , G11B7/12 , G11B7/13 , G11B7/135 , G11B7/00
CPC分类号： G11B7/131 , G02B27/0037 , G02B27/4238 , G02B27/4277 , G02B5/1819 , G02B5/1857 , G02B5/32 , G11B7/094 , G11B7/123 , G11B7/1353 , G11B7/0912
摘要： Disclosed is a compact optical pick-up head apparatus suitable for mass-production, which comprises a light radiation source, an element composed of photodetector split into a plurality of regions and integrated on the same base, an objective lens for focusing a beam from the above source on an optical disk, a blazed hologram integrated to the support member of the lens, a means for driving the support member to which the objective lens and blazed hologram are integrated in response to an output as servo signal output from the photodetector which receives a diffracted beam produced in such a manner that a return beam reflected or diffracted by the optical disk is incident on the objective lens integrated with the above hologram. The optical pickup apparatus according to the present invention employs a region-split-type phase hologram in which a pair of Flesnel zone plate-like patterns, by which a plurality of diffraction wavefronts having a different focus and the same diffraction order are produced outside an optical-axis, are non-superimposedly formed. The above hologram can be blazed with a pinpoint accuracy by lithography using a few mask patterns synthesized by a computer, and further a more preferably blazing can be realized by the combination of the ion beam etching and the lithography. Accordingly, not only noise caused by an unnecessary diffracted beam component but also the offset of a servo signal can be restrained and the size of the objective lens can be reduced by the integration of the entire optical system, which greatly contributes to the superminiaturization of an optical head.
摘要翻译：公开了一种适用于批量生产的紧凑型光学拾取头装置，其包括光辐射源，由分离成多个区域并集成在同一基底上的光电检测器构成的元件，用于将来自在光盘上的源极上，与透镜的支撑构件集成的闪耀的全息图，用于驱动支撑构件的装置，物镜和闪耀的全息图响应于作为从接收到的光电检测器输出的伺服信号的输出而被集成到该支撑构件上以使得由光盘反射或衍射的返回光束入射到与上述全息图集成的物镜上的方式产生的衍射光束。根据本发明的光学拾取装置采用区域分割型相位全息图，其中一对Flesnel区域板状图案，其中具有不同焦点和相同衍射级的多个衍射波前在外部产生光轴不叠加地形成。通过使用由计算机合成的几个掩模图案通过光刻可以使上述全息图以精确的准确度闪耀，并且还可以通过离子束蚀刻和光刻的组合来实现更好的燃烧。因此，不仅可以抑制由不必要的衍射光束分量引起的噪声，而且可以抑制伺服信号的偏移，并且可以通过整个光学系统的整合来减小物镜的尺寸，这极大地有助于使光头。

2. 发明授权

US5687153A Optical head device and optical information apparatus using a lithium niobate hologram with divisional areas to diffract light to corresponding photo detector areas 失效
$Optical head device and optical information apparatus using a lithium niobate hologram with divisional areas to diffract light to corresponding photo detector areas$
标题翻译：使用具有分区的铌酸锂全息图的光头装置和光信息装置将光衍射到相应的光检测器区域
公开(公告)号：US5687153A
公开(公告)日：1997-11-11
申请号：US778508
申请日：1997-01-03
申请人： Yoshiaki Komma , Seiji Nishino , Shin-ichi Kadowaki , Hiroaki Yamamoto , Makoto Kato , Tetsuo Saimi
发明人： Yoshiaki Komma , Seiji Nishino , Shin-ichi Kadowaki , Hiroaki Yamamoto , Makoto Kato , Tetsuo Saimi
IPC分类号： G11B7/09 , G11B7/12 , G11B7/135 , G11B11/105 , G11B7/00
CPC分类号： G11B7/1353 , G11B11/10543 , G11B7/12 , G11B7/123 , G11B7/0912
摘要： An optical head device includes: a light source for emitting a light beam; an objective lens for converging the light beam on an information storage medium; a hologram for receiving the light beam reflected by the information storage medium and generating diffracted light from the light beam, the hologram having such a polarization anisotropy that it diffracts light in a second polarization state more strongly than light in a first polarization state which is different from the second polarization state; and a photodetector including a plurality of photodetective sections for receiving a part of the diffracted light and outputting a photocurrent in accordance with the intensity of the part of the diffracted light. The optical head device further include a quarter-wave plate disposed between the objective lens and the hologram for causing the polarization state of the light beam reflected by the information storage medium to be the second polarization state; and the hologram is disposed so that the distance between the hologram and the objective lens is shorter than the distance between the hologram and the photodetector.
摘要翻译：光头装置包括：用于发射光束的光源; 用于将光束会聚在信息存储介质上的物镜; 用于接收由信息存储介质反射的光束并产生来自光束的衍射光的全息图，该全息图具有这样的偏振各向异性，使得它在比第一偏振态不同的光更强烈地衍射具有第二偏振态的光从第二极化状态; 以及光电检测器，其包括多个光电检测部分，用于接收一部分衍射光并根据部分衍射光的强度输出光电流。光头装置还包括设置在物镜和全息图之间的四分之一波片，用于使由信息存储介质反射的光束的偏振状态成为第二偏振状态; 并且全息图被设置成使得全息图和物镜之间的距离比全息图和光电检测器之间的距离短。

3. 发明授权

US5519685A Optical pickup head apparatus capable of suppressing crosstalk from adjacent tracks and in the recording line density direction 失效
标题翻译：能够抑制来自相邻轨道和记录线密度方向的串扰的光拾取头装置
公开(公告)号：US5519685A
公开(公告)日：1996-05-21
申请号：US111959
申请日：1993-08-26
申请人： Makoto Kato , Hiroaki Yamamoto , Seiji Nishino , Shin-ichi Kadowaki
发明人： Makoto Kato , Hiroaki Yamamoto , Seiji Nishino , Shin-ichi Kadowaki
IPC分类号： G11B7/00 , G11B7/005 , G11B7/09 , G11B7/125 , G11B7/13 , G11B7/135 , G11B11/105
CPC分类号： G11B7/1353 , G11B11/10545 , G11B7/0903 , G11B7/125 , G11B7/131 , G11B7/1367
摘要： An optical pickup head apparatus comprises a first coherent light source for emitting a coherent light serving as a main beam, and a second coherent light source for emitting a coherent light having a polarized plane at a right angle to the polarized plane of the coherent light emitted from the first coherent light source. When the coherent light emitted from the second coherent light source is incident upon a phase plate, the phase plate yields a sub-beam presenting a distribution of light intensity having peak values at at least both sides of the center of the sub-beam on a plane vertical with respect to the optical axis of the coherent light. Focusing means overlaps the main beam emitted from the first coherent light source on the sub-beam emitted from the phase plate, causing the resulting overlapped beam to be focused on the information-recorded surface of an optical disk. When a focused beam as reflected from the information-recorded surface of the optical disk is incident upon polarized beam separating means, the polarized beam separating means yields the transmitted beam as divided into the main beam and the sub-beam. Optical detecting means individually detects and supplies the light intensities of the main beam and the sub-beam emitted from the polarized beam separating means.
摘要翻译：光拾取头装置包括用于发射用作主光束的相干光的第一相干光源和用于发射具有与发射的相干光的偏振平面成直角的偏振面的相干光的第二相干光源从第一个相干光源。当从第二相干光源发射的相干光入射到相位板上时，相位板产生一个子光束，该子光束呈现在至少在子光束中心两侧的峰值的光强分布，相对于相干光的光轴垂直。聚焦装置与从相位板发射的子光束上的从第一相干光源发射的主光束重叠，导致所产生的重叠光束聚焦在光盘的信息记录表面上。当从光盘的信息记录表面反射的聚焦光束入射到偏振光束分离装置时，偏振光束分离装置产生被分成主光束和子光束的透射光束。光检测装置分别检测并提供从偏振光束分离装置发射的主光束和子光束的光强度。

4. 发明授权

US5111448A Optical pickup head having a hologram-associated objective lens and optical information processing apparatus using the same 失效
标题翻译：具有光学相关镜片的光学拾取头和使用其的光学信息处理装置
公开(公告)号：US5111448A
公开(公告)日：1992-05-05
申请号：US362095
申请日：1989-08-06
申请人： Yoshiaki Komma , Shinichi Kadowaki , Makoto Kato , Tetsuo Saimi
发明人： Yoshiaki Komma , Shinichi Kadowaki , Makoto Kato , Tetsuo Saimi
IPC分类号： G02B5/32 , G11B7/09 , G11B7/12 , G11B7/135
CPC分类号： G11B7/1374 , G11B7/094 , G11B7/12 , G11B7/1353 , G11B7/1381 , G11B7/0909 , G11B7/0912
摘要： An optical pickup head for performing recording, reproducing and erasing of information on an optical disc in an optical system employs an objective lens, which is integrated or combined with a holographic optical element, so that the focusing of a diffraction beam on a photo-sensor is stabilized irrespective of the movement of the objective lens due to the tracking control operation in the optical system.

5. 发明授权

US5594713A Optical pickup head apparatus 失效
标题翻译：光学拾音头装置
公开(公告)号：US5594713A
公开(公告)日：1997-01-14
申请号：US564745
申请日：1995-11-29
申请人： Yoshiaki Komma , Seiji Nishino , Makoto Kato , Kaoru Matsuda
发明人： Yoshiaki Komma , Seiji Nishino , Makoto Kato , Kaoru Matsuda
IPC分类号： G02B5/32 , G02F1/09 , G11B7/135 , G11B11/10 , G11B11/105 , G11B7/00
CPC分类号： G11B7/1353 , G11B11/10545 , G11B7/1369 , G11B7/1381
摘要： An optical pickup head apparatus comprising: a light source; an imaging optics for receiving a linearly polarized light beam emitted from the light source, and converges it on a small spot on an information medium; photodetector units for receiving the light beam being reflected and diffracted at the information medium and output electric signals corresponding to received light quantities; a liquid crystal hologram consisting of a pair of transparent substrates, a liquid crystal sandwiched therebetween through a pair of transparent electrodes, either of the transparent electrodes being formed with a hologram pattern; and a Faraday rotator for rotating a polarized direction of light beam by 45 degrees in a light path leading from the light source to the information medium and, further, rotates the polarized direction of the light beam by 45 degrees in its opposite light path. The liquid crystal hologram is applied a constant voltage so that the light beam reflected at the information medium is diffracted in the liquid crystal hologram to generate .+-.1-order diffraction light beams, and the photodetector units sense both of light quantities of said .+-.1-order diffraction light beams emitted from the liquid crystal hologram. Then, a subtraction between signals representing the light quantities is calculated so as to obtain an information signal.
摘要翻译：一种光学拾取头装置，包括：光源; 用于接收从光源发射的线偏振光束并将其会聚在信息介质上的小点上的成像光学器件; 用于接收光束的光电检测器单元在信息介质处被反射和衍射并输出对应于接收光量的电信号; 由一对透明基板构成的液晶全息图，通过一对透明电极夹在其间的液晶，透明电极中的任一方形成全息图图案; 以及用于在从光源引导到信息介质的光路中使光束的偏振方向旋转45度的法拉第旋转器，并且进一步使光束的偏振方向在相反的光路中旋转45度。施加恒定电压，使得在信息介质中反射的光束在液晶全息图中被衍射以产生+/- 1级衍射光束，并且光电检测器单元检测所述+ 从液晶全息图发射的-1级衍射光束。然后，计算表示光量的信号之间的减法，以获得信息信号。

6. 发明授权

US5644413A Optical head for adjusting a positional relation between the information medium and the optical head 失效
标题翻译：用于调整信息介质和光学头之间的位置关系的光学头
公开(公告)号：US5644413A
公开(公告)日：1997-07-01
申请号：US501351
申请日：1995-07-12
申请人： Yoshiaki Komma , Sadao Mizuno , Makoto Kato , Hidenori Wada , Seiji Nishino
发明人： Yoshiaki Komma , Sadao Mizuno , Makoto Kato , Hidenori Wada , Seiji Nishino
IPC分类号： G02B5/18 , G02B5/32 , G11B7/09 , G11B7/125 , G11B7/135
CPC分类号： G11B7/1353 , G02B5/1876 , G02B5/32 , G11B7/126 , G11B7/127 , G11B7/1359 , G11B7/1376 , G11B7/1378 , G11B7/13922 , G11B7/0912 , Y10S359/90
摘要： An optical head apparatus consists of a semiconductor laser for radiating a light beam, a first collimator lens for collimating the light beam, a wedge-like prism for reshaping the light beam, a beam splitter for transmitting the light beam in an outgoing path and splitting the light beam in an incoming path, an objective lens for converging the light beam at an information medium in which information is stored, a plane type of hologram lens integrally formed with the objective lens for excessively correcting chromatic aberration of the objective lens to cancel out chromatic aberration of the collimator lens, a second collimator lens for converging the light beam split, a photo detector for detecting intensity of the light beam converged to obtain an information signal and servo signals, and an actuating unit for slightly moving the objective lens and the hologram lens according to the servo signals. A wavelength of the light beam is lengthened as intensity of the light beam is increased. Even though an astigmatic difference occurs in the semiconductor laser, the change of a focal length of the collimator lens cancels out the change of the astigmatic difference to prevent the occurrence of astigmatic aberration.
摘要翻译：光头装置由用于照射光束的半导体激光器，用于准直光束的第一准直透镜，用于整形光束的楔形棱镜，用于在输出路径中传输光束的分束器和分离器入射路径中的光束，用于在存储信息的信息介质处会聚光束的物镜，与物镜整体形成的平面型全息透镜，用于过度校正物镜的色差以抵消准直透镜的色差，用于会聚光束的第二准直透镜，用于检测会聚的光束的强度的光检测器，以获得信息信号和伺服信号，以及用于使物镜稍微移动的致动单元全息透镜根据伺服信号。当光束的强度增加时，光束的波长被延长。即使在半导体激光器中出现散像差异，准直透镜的焦距的变化抵消像散差的变化，从而防止散光像差的发生。

7. 发明授权

US5495461A Optical pickup head apparatus 失效
标题翻译：光学拾音头装置
公开(公告)号：US5495461A
公开(公告)日：1996-02-27
申请号：US932112
申请日：1992-08-19
申请人： Yoshiaki Komma , Seiji Nishino , Makoto Kato , Kaoru Matsuda
发明人： Yoshiaki Komma , Seiji Nishino , Makoto Kato , Kaoru Matsuda
IPC分类号： G02B5/32 , G02F1/09 , G11B7/135 , G11B11/10 , G11B11/105 , G11B7/00
CPC分类号： G11B7/1353 , G11B11/10545 , G11B7/1369 , G11B7/1381
摘要： An optical pickup head apparatus comprising: a light source; an imaging optics for receiving a linearly polarized light beam emitted from the light source, and converges it on a small spot on an information medium; photodetector units for receiving the light beam being reflected and diffracted at the information medium and output electric signals corresponding to received light quantities; a liquid crystal hologram consisting of a pair of transparent substrates, a liquid crystal sandwiched therebetween through a pair of transparent electrodes, either of the transparent electrodes being formed with a hologram pattern; and a Faraday rotator for rotating a polarized direction of light beam by 45 degrees in a light path leading from the light source to the information medium and, further, rotates the polarized direction of the light beam by 45 degrees in its opposite light path. The liquid crystal hologram is applied a constant voltage so that the light beam reflected at the information medium is diffracted in the liquid crystal hologram to generate .+-.1-order diffraction light beams, and the photodetector units sense both of light quantities of said .+-.1-order diffraction light beams emitted from the liquid crystal hologram. Then, a subtraction between signals representing the light quantities is calculated so as to obtain an information signal.
摘要翻译：一种光学拾取头装置，包括：光源; 用于接收从光源发射的线偏振光束并将其会聚在信息介质上的小点上的成像光学器件; 用于接收光束的光电检测器单元在信息介质处被反射和衍射并输出对应于接收光量的电信号; 由一对透明基板构成的液晶全息图，通过一对透明电极夹在其间的液晶，透明电极中的任一方形成全息图图案; 以及用于在从光源引导到信息介质的光路中使光束的偏振方向旋转45度的法拉第旋转器，并且进一步使光束的偏振方向在相反的光路中旋转45度。施加恒定电压，使得在信息介质中反射的光束在液晶全息图中被衍射以产生+/- 1级衍射光束，并且光电检测器单元检测所述+ 从液晶全息图发射的-1级衍射光束。然后，计算表示光量的信号之间的减法，以获得信息信号。

8. 发明授权

US5412631A Optical head apparatus for storing, reading or erasing information, and optical information reproducing method and optical information apparatus for optically reading information stored in an optical memory 失效
标题翻译：用于存储，读取或擦除信息的光学头装置，以及用于光学读取存储在光学存储器中的信息的光学信息再现方法和光学信息装置
公开(公告)号：US5412631A
公开(公告)日：1995-05-02
申请号：US87439
申请日：1993-07-08
申请人： Yoshiaki Komma , Seiji Nishino , Makoto Kato
发明人： Yoshiaki Komma , Seiji Nishino , Makoto Kato
IPC分类号： G11B7/13 , G11B7/135
CPC分类号： G11B7/131 , G11B7/1353
摘要： An optical head apparatus consists of a light beam source, a blazed hologram partitioned into diffraction regions for mainly changing the light beam radiated from the light beam source to zero-order diffraction light and secondarily diffracting the light beam to produce beams of unnecessary light such as N-order diffraction light (N.noteq.0), an information medium for storing information, an objective lens for converging the zero-order diffraction light and the unnecessary light at the information medium, and a six-division photo detector having six detecting sections for detecting intensity of first-order diffraction light produced by diffracting the zero-order diffraction light in the blazed hologram. A hologram pattern of the blazed hologram is formed to function as a lens for the unnecessary light. A focus servo signal is produced according to mutual relation among intensities of the first-order diffraction light detected in the six detecting sections to focus the objective lens on the information medium For the zero-order diffraction light. Therefore, the objective lens is not focused on the information medium for the unnecessary light. Also, the beams of the unnecessary light diffracted in each of the diffraction regions of the blazed hologram are greatly widened because numerical apertures of the diffraction regions are small.
摘要翻译：光头装置由光束源，闪耀的全息图分割成衍射区域，用于主要将从光束源辐射的光束改变为零级衍射光，并且二次衍射光束以产生不必要的光束，例如 N阶衍射光（N NOTEQUAL 0），用于存储信息的信息介质，用于会聚零级衍射光的物镜和信息介质上的不必要光;以及六分光电检测器，具有六个检测部分，用于检测在闪耀的全息图中衍射零级衍射光产生的一级衍射光的强度。闪耀全息图的全息图形成为不必要的光的透镜。根据在六个检测部分中检测到的一级衍射光的强度之间的相互关系产生聚焦伺服信号，以将物镜聚焦在信息介质上用于零级衍射光。因此，物镜不会聚焦在不需要的光的信息介质上。此外，由于衍射区域的数值孔径小，所以在闪耀的全息图的每个衍射区域中衍射的不需要的光束被大大地加宽。

9. 发明授权

US06185168B2 Super-resolution optical head apparatus 有权
标题翻译：超分辨率光头设备
公开(公告)号：US06185168B2
公开(公告)日：2001-02-06
申请号：US09465773
申请日：1999-12-17
申请人： Makoto Kato , Kenichi Kasazumi , Shin-ichi Kadowaki , Hiroaki Yamamoto , Kazuhisa Yamamoto
发明人： Makoto Kato , Kenichi Kasazumi , Shin-ichi Kadowaki , Hiroaki Yamamoto , Kazuhisa Yamamoto
IPC分类号： G11B709
CPC分类号： B82Y10/00 , G06K7/10831 , G06K2207/1013 , G11B7/123 , G11B7/131 , G11B7/1353 , G11B7/1367 , G11B7/1369 , G11B7/1387 , G11B7/1395 , G11B11/10543 , G11B2007/13727
摘要： A linearly polarized light beam emitted from a coherent light source reaches a polarizing phase plate and is thereby divided into a primary beam and a subsidiary beam having a polarized light component perpendicular to the polarized light component of the primary beam and a double-humped pattern, in which the center position coincides with the center position of the primary beam and the principal portion is equal in size to the principal portion of the primary beam. The primary beam and the subsidiary beam are focused onto an information storage surface of an optical disk and reflected therefrom, so that they are separated again through polarization separation and individually detected by first to third optical detectors. The output signals from the first to third optical detectors are calculated by a differential calculator and outputted therefrom.
摘要翻译：从相干光源发射的线偏振光束到达偏振相位板，从而分为初级光束和具有垂直于主光束的偏振光分量的偏振光分量的辅助光束和双峰形图案，其中中心位置与主光束的中心位置一致，并且主要部分的大小与主光束的主要部分相等。主光束和辅助光束被聚焦到光盘的信息存储表面上并从其反射，使得它们通过偏振分离再次分离并且由第一至第三光学检测器单独检测。来自第一至第三光学检测器的输出信号由差分计算器计算并输出。

10. 发明授权

US6115345A Super-resolution optical head apparatus 失效
标题翻译：超分辨率光头设备
公开(公告)号：US6115345A
公开(公告)日：2000-09-05
申请号：US888529
申请日：1997-07-07
申请人： Makoto Kato , Kenichi Kasazumi , Shin-ichi Kadowaki , Hiroaki Yamamoto , Kazuhisa Yamamoto
发明人： Makoto Kato , Kenichi Kasazumi , Shin-ichi Kadowaki , Hiroaki Yamamoto , Kazuhisa Yamamoto
IPC分类号： G06K7/10 , G11B7/12 , G11B7/13 , G11B7/135 , G11B11/105 , G11B7/00
CPC分类号： B82Y10/00 , G06K7/10831 , G11B11/10543 , G11B7/123 , G11B7/131 , G11B7/1353 , G11B7/1367 , G11B7/1369 , G11B7/1387 , G11B7/1395 , G06K2207/1013 , G11B2007/13727
摘要： A linearly polarized light beam emitted from a coherent light source reaches a polarizing phase plate and is thereby divided into a primary beam and a subsidiary beam having a polarized light component perpendicular to the polarized light component of the primary beam and a double-humped pattern, in which the center position coincides with the center position of the primary beam and the principal portion is equal in size to the principal portion of the primary beam. The primary beam and the subsidiary beam are focused onto an information storage surface of an optical disk and reflected therefrom, so that they are separated again through polarization separation and individually detected by first to third optical detectors. The output signals from the first to third optical detectors are calculated by a differential calculator and outputted therefrom.
摘要翻译：从相干光源发射的线偏振光束到达偏振相位板，从而分为初级光束和具有垂直于主光束的偏振光分量的偏振光分量的辅助光束和双峰值图案，其中中心位置与主光束的中心位置一致，并且主要部分的大小与主光束的主要部分相等。主光束和辅助光束被聚焦到光盘的信息存储表面上并从其反射，使得它们通过偏振分离再次分离并且由第一至第三光学检测器单独检测。来自第一至第三光学检测器的输出信号由差分计算器计算并输出。

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