公开(公告)号：US5717675A

公开(公告)日：1998-02-10

申请号：US639895

申请日：1996-04-26

申请人： Masakuni Yamamoto

发明人： Masakuni Yamamoto

IPC分类号： G11B11/10 ,  G11B7/09 ,  G11B7/12 ,  G11B7/135 ,  G11B11/105 ,  G11B7/00

CPC分类号： G11B7/1353 ,  G11B11/10543 ,  G11B7/123 ,  G11B7/0901 ,  G11B7/0908

摘要： An optical head of the present invention applies p-polarized light from a semiconductor laser chip to a magneto-optical disk in the form of a spot through a collimator lens and an objective. The optical head has a polarized-light separating hologram device for separating only an s-polarized light component from the reflected light. A hologram formed on the hologram device has two polarized-light separating surfaces divided by a line in the direction corresponding to the information track direction. Beams separated on the separating surfaces are guided to two information-reproducing photodetectors, respectively. A transparent cover of a semiconductor laser apparatus is provided with a separating hologram. A beam separated on the hologram is guided to a multi-division photodetector used for auto-focusing and auto-tracking operations. The information-reproducing photodetectors, the multi-division photodetector, and the semiconductor laser chip are formed on a common substrate. With this arrangement, a smaller and lighter optical head can be achieved.

摘要翻译： 本发明的光头通过准直透镜和物镜将来自半导体激光器芯片的p偏振光以斑点的形式应用于磁光盘。 光头具有用于从反射光中仅分离s偏振光分量的偏振光分离全息装置。 形成在全息装置上的全息图具有在与信息轨道方向对应的方向上被划分成一行的两个偏振光分离面。 在分离表面上分离的光束分别被引导到两个信息再现光电检测器。 半导体激光装置的透明盖设置有分离全息图。 在全息图上分离的光束被引导到用于自动聚焦和自动跟踪操作的多分光电检测器。 信息再现光电检测器，多分光电检测器和半导体激光芯片形成在公共基板上。 通过这种布置，可以实现更小和更轻的光学头。

公开(公告)号：US5610897A

公开(公告)日：1997-03-11

申请号：US570251

申请日：1995-12-11

申请人： Masakuni Yamamoto ,  Susumu Matsumura ,  Hiroaki Hoshi ,  Eiji Yamaguchi

发明人： Masakuni Yamamoto ,  Susumu Matsumura ,  Hiroaki Hoshi ,  Eiji Yamaguchi

IPC分类号： G11B7/005 ,  G11B7/13 ,  G11B11/105 ,  G01B11/02

CPC分类号： G11B11/10515 ,  G11B11/10545 ,  G11B7/0051 ,  G11B7/131

摘要： In an optical information recording/reproducing apparatus, the reproduction of information is performed as following manner. A light spot is formed on a recording medium on which information is recorded so that a phase of light reflected by a small region as an information pit is different from a phase of light reflected by other regions. Upon scanning the recording medium with the light spot, a leading edge and a trailing edge of the information pit in the scanning direction are respectively detected. A detection signal for the leading edge of the information pit and a detection signal for the trailing edge of the information pit are synthesized to effect the reproduction of information.

摘要翻译： 在光信息记录/再现装置中，以如下方式执行信息的再现。 在记录有信息的记录介质上形成光点，使得由作为信息坑的小区域反射的光的相位与其他区域反射的光的相位不同。 在用光点扫描记录介质时，分别检测信息凹坑在扫描方向上的前沿和后沿。 合成信息凹坑的前沿的检测信号和信息凹坑的后沿的检测信号，以实现信息的再现。

公开(公告)号：US5539718A

公开(公告)日：1996-07-23

申请号：US115656

申请日：1993-09-03

申请人： Hiroaki Hoshi ,  Susumu Matsumura ,  Masakuni Yamamoto ,  Eiji Yamaguchi

发明人： Hiroaki Hoshi ,  Susumu Matsumura ,  Masakuni Yamamoto ,  Eiji Yamaguchi

IPC分类号： G11B7/00 ,  G11B7/005 ,  G11B7/125 ,  G11B7/13 ,  G11B7/135 ,  G11B11/105 ,  G11B20/10

CPC分类号： G11B7/126 ,  G11B7/1359 ,  G11B7/1369 ,  G11B7/1398 ,  G11B11/10543 ,  G11B20/10203 ,  G11B20/10212

摘要： An optical head includes an irradiating device for irradiating a recording medium with a light beam, a separating device disposed in an optical path between the recording medium and the irradiating device, which is provided for separating a portion of the light beam traveling from the irradiating device to the recording medium, and a detecting device for detecting the portion of the beam separated by the separating device, which has a plurality of sensor portions.

摘要翻译： 光头包括用于用光束照射记录介质的照射装置，设置在记录介质和照射装置之间的光路中的分离装置，用于分离从照射装置传播的光束的一部分 以及检测装置，用于检测由具有多个传感器部分的由分离装置分离的光束的部分。

公开(公告)号：US5297128A

公开(公告)日：1994-03-22

申请号：US984740

申请日：1992-12-02

申请人： Eiji Yamaguchi ,  Susumu Matsumura ,  Hiroaki Hoshi ,  Masakuni Yamamoto ,  Hideki Morishima

发明人： Eiji Yamaguchi ,  Susumu Matsumura ,  Hiroaki Hoshi ,  Masakuni Yamamoto ,  Hideki Morishima

IPC分类号： G11B11/10 ,  G11B7/00 ,  G11B7/0045 ,  G11B7/125 ,  G11B11/105

CPC分类号： G11B19/046 ,  G11B11/10506 ,  G11B11/10515 ,  G11B11/10595 ,  G11B7/0045 ,  G11B7/126

摘要： An optical information recording/reproducing apparatus provided with a device for irradiating an information track of an optical information recording medium with a preheating light beam. Simultaneously, a recording/reproducing light beam irradiates a light spot of the preheating light beam on the recording medium. The light intensity of the preheating light beam is varied in accordance with the environmental temperature of the apparatus detected by a detector. By such a construction, the recording/reproducing condition of information is kept constant, irrespective of the environmental temperature.

摘要翻译： 一种光信息记录/再现装置，其具有用于对具有预热光束的光信息记录介质的信息轨道进行照射的装置。 同时，记录/再现光束将预热光束的光点照射在记录介质上。 预热光束的光强度根据由检测器检测到的装置的环境温度而变化。 通过这样的结构，无论环境温度如何，信息的记录/再现条件保持恒定。

公开(公告)号：US5199023A

公开(公告)日：1993-03-30

申请号：US457863

申请日：1989-12-27

申请人： Masakuni Yamamoto ,  Shigeto Kanda

发明人： Masakuni Yamamoto ,  Shigeto Kanda

IPC分类号： G11B11/10 ,  G11B7/00 ,  G11B7/004 ,  G11B7/007 ,  G11B7/09 ,  G11B7/24 ,  G11B11/105

CPC分类号： G11B7/0938 ,  G11B7/24079 ,  G11B7/00745

摘要： An optical information recording medium includes a recording surface formed by a recording layer provided on a substrate, the recording surface being provided with parallel information tracks each divided into plural blocks, each of which is formed by a data area for information recording and a servo area for forming prepits for tracking signal detection, wherein the data area has a separating part the height of which is different from that of the information track and which is provided between information tracks adjacent to each other, and the difference in height is equal to or larger than the thickness of the recording layer, and wherein the servo area is not provided within the separating part.

公开(公告)号：US5051974A

公开(公告)日：1991-09-24

申请号：US405061

申请日：1989-09-08

申请人： Naosato Taniguchi ,  Kiyonobu Endo ,  Tetsuro Kuwayama ,  Hiroaki Hoshi ,  Hiroshi Osawa ,  Koyo Hasegawa ,  Masakuni Yamamoto

发明人： Naosato Taniguchi ,  Kiyonobu Endo ,  Tetsuro Kuwayama ,  Hiroaki Hoshi ,  Hiroshi Osawa ,  Koyo Hasegawa ,  Masakuni Yamamoto

IPC分类号： G02B27/10 ,  G11B7/135

CPC分类号： G11B7/1365 ,  G02B27/1073 ,  G02B27/1093 ,  G11B7/1353

摘要： An optical head device comprises a light source, a light splitter for reflecting a light emitted from the light source by a first plane thereof to direct the light to an information carrier and transmitting the light from the information carrier through the first plane, a photo-detector for detecting the light from the information carrier, and a diffraction grating structure arranged on a second plane of the light splitter for diffracting the light transmitted through the first plane and directing it to the photo-detector.

摘要翻译： 一种光学头装置，包括光源，光分离器，用于通过第一平面反射从光源发射的光，以将光引导到信息载体并将来自信息载体的光透过第一平面; 检测器，用于检测来自信息载体的光;以及衍射光栅结构，其布置在光分离器的第二平面上，用于衍射透过第一平面的光并将其引导到光检测器。