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1. 发明授权

US5814400A Magneto-optical recording medium and method 失效
标题翻译：磁光记录介质及方法
公开(公告)号：US5814400A
公开(公告)日：1998-09-29
申请号：US702936
申请日：1991-05-20
申请人： Fumiyoshi Kirino , Yoshinori Miyamura , Junko Nakamura , Norio Ohta , Masahiko Takahashi , Ryo Suzuki
发明人： Fumiyoshi Kirino , Yoshinori Miyamura , Junko Nakamura , Norio Ohta , Masahiko Takahashi , Ryo Suzuki
IPC分类号： G11B11/105 , G11B5/66
CPC分类号： G11B11/10584 , G11B11/10586 , Y10S428/90 , Y10T428/12493 , Y10T428/12806 , Y10T428/12861 , Y10T428/12875 , Y10T428/12931 , Y10T428/12937 , Y10T428/26 , Y10T428/265
摘要： A magneto-optical recording medium comprises in combination: a magneto-optical recording layer capable of writing or erasing information by a laser beam and an external magnetic field and of reading the information by a Kerr effect; and a substrate having the magneto-optical recording layer formed thereon. The magneto-optical recording layer has at least two layers, including a first magneto-optical recording layer and a second magneto-optical recording layer which are magnetically coupled together. The first magneto-optical recording layer is a layer providing a greater magneto-optical effect in a short light wavelength range than the second magneto-optical recording layer though that having less perpendicular magnetic energy than this, as is provided on an irradiation side of the laser beam. It provides advantages in both the magneto-optical effect and perpendicular anisotropy in consideration of the thicknesses or compositions of the first and second magneto-optical recording layers.
摘要翻译：一种磁光记录介质，其特征在于包括：能够通过激光束和外部磁场写入或擦除信息并通过克尔效应读取信息的磁光记录层; 以及在其上形成有磁光记录层的基板。磁光记录层具有至少两层，包括磁耦合在一起的第一磁光记录层和第二磁光记录层。第一磁光记录层是在比第二磁光记录层更短的光波长范围内提供比这更小的垂直磁能的磁光效应的层，如在第二磁光记录层的照射侧激光束。考虑到第一和第二磁光记录层的厚度或组成，它在磁光效应和垂直各向异性两方面都具有优势。

2. 发明授权

US5270987A Magneto-optical recording and reproducing method, magneto-optical memory apparatus and magneto-optical recording medium therefor 失效
标题翻译：磁光记录和再现方法，磁光存储装置及其磁光记录介质
公开(公告)号：US5270987A
公开(公告)日：1993-12-14
申请号：US509743
申请日：1990-04-17
申请人： Toshimitsu Kaku , Shigeru Nakamura , Masahiko Takahashi , Toshio Niihara , Harukazu Miyamoto , Norio Ohta , Takeshi Nakao , Hirofumi Sukeda , Masahiro Ojima , Takashi Toyooka , Tsuneo Suganuma , Fumiyoshi Kirino , Yoshinori Miyamura
发明人： Toshimitsu Kaku , Shigeru Nakamura , Masahiko Takahashi , Toshio Niihara , Harukazu Miyamoto , Norio Ohta , Takeshi Nakao , Hirofumi Sukeda , Masahiro Ojima , Takashi Toyooka , Tsuneo Suganuma , Fumiyoshi Kirino , Yoshinori Miyamura
IPC分类号： G11B11/105 , G11B11/00
CPC分类号： G11B11/10584 , G11B11/10536 , G11B11/10545 , G11B11/10552 , G11B11/10558 , G11B11/10593 , G11B11/10571
摘要： A magnetic field of a polarity corresponding to information to be recorded is applied while a recording spot having a high energy is irradiated to a magneto-optical recording medium to record domains representing the information along a track. The recorded domains are read out by a reproducing spot having a lower energy than the recording spot and a high resolution power along the track. A recording head has an optical system for irradiating the recording spot having the high energy to the magneto-optical recording medium and a magnetic head for applying a magnetic field having a polarity thereof switched in accordance with the information to be recorded, to an irradiation area of the recording spot, a reproducing head has an optical system for irradiating the reproducing spot having the low energy by a laser beam having a wavelength of no larger than 600 nm and a magneto-optical signal detector for detecting a displacement of a polarization plane of a reflected light of the reproducing spot to read out the recording domains. The magneto-optical recording medium is made of a recording film having a multi-layer structure of alternate lamination of metal layers and dielectric layers.
摘要翻译：将具有高能量的记录点照射到磁光记录介质上，记录与记录信息对应的极性的磁场，记录表示信息沿着轨迹的域。记录的区域由具有比记录点更低的能量的再现点和沿着轨道的高分辨率电力读出。记录头具有用于向磁光记录介质照射具有高能量的记录点的光学系统和用于根据要记录的信息将其极性切换的磁场施加到照射区域的记录点，再现头具有用于通过具有不大于600nm的波长的激光束照射具有低能量的再现点的光学系统和用于检测偏振面的位移的磁光信号检测器再现点的反射光读出记录区域。磁光记录介质由具有金属层和电介质层的交替叠层的多层结构的记录膜制成。

3. 发明授权

US4889757A Optical recording disk 失效
标题翻译：光盘录像机
公开(公告)号：US4889757A
公开(公告)日：1989-12-26
申请号：US016349
申请日：1987-02-19
申请人： Shinkichi Horigome , Toshio Niihara , Norio Ohta , Yutaka Sugita , Yoshinori Miyamura , Ryoichi Sudo , Hiroaki Miwa , Tetsuo Tajima
发明人： Shinkichi Horigome , Toshio Niihara , Norio Ohta , Yutaka Sugita , Yoshinori Miyamura , Ryoichi Sudo , Hiroaki Miwa , Tetsuo Tajima
IPC分类号： C08F2/48 , G11B7/241 , G11B7/253 , G11B11/10 , G11B11/105
CPC分类号： G11B7/252 , G11B11/10582 , G11B7/2542 , G11B2007/24304 , G11B7/2531 , G11B7/2533 , G11B7/2548 , G11B7/256 , G11B7/2578 , Y10S428/913 , Y10S430/146 , Y10T428/31598
摘要： In an optical recording disk wherein a resin layer cured with ultraviolet radiation is provided on a surface of a transparent substrate, the present invention consists in that a material having a heat distortion temperature of at least 65.degree. C. is employed for the ultraviolet-cured resin layer. The appearance of wrinkles on a UV-cured resin surface is suppressed, whereby an optical recording disk of high carrier-to-noise ratio and long lifetime can be provided.
摘要翻译：在透明基板的表面设置有紫外线固化树脂层的光记录盘中，本发明的特征在于，将热变形温度为65℃以上的材料用于紫外线固化树脂层。紫外线固化树脂表面上的皱纹的外观被抑制，从而可以提供高的载波信噪比和长寿命的光记录盘。

4. 发明授权

US5179546A Magneto-optical disk and process for manufacturing the same 失效
标题翻译：磁光盘及其制造方法
公开(公告)号：US5179546A
公开(公告)日：1993-01-12
申请号：US631984
申请日：1990-12-21
申请人： Yumiko Anzai , Yoshinori Miyamura , Toshio Niihara , Harukazu Miyamoto , Norio Ohta
发明人： Yumiko Anzai , Yoshinori Miyamura , Toshio Niihara , Harukazu Miyamoto , Norio Ohta
IPC分类号： G11B11/10 , G11B7/26 , G11B11/105
CPC分类号： G11B11/10584 , G11B11/10582 , G11B7/26
摘要： A magneto-optical disk which has a circular disk form and comprises a substrate provided with information pits and a guide groove, a recording medium layer provided on the substrate, and a protective layer formed of at least one thin film on the medium layer, in which the surface of the protective layer is minutely roughened to have a concave rough pattern and not to substantially protrude beyond a reference level composed of the outermost surface portions of the protective layer. When the magneto-optical disk is subjected to recording by a CSS system using an air floating magnetic head conforming to high-frequency recording in a magnetic field modulation type recording, which is one of methods of overwrite recording on magneto-optical disks, the minute concave rough pattern formed on the surface of the disk substrate prevents such troubles as adhesion of the magnetic head to the surface of the disk and collision between the disk substrate being rotated and the head.
摘要翻译：一种具有圆盘形状并包括设置有信息凹坑的衬底和引导槽的磁光盘，设置在衬底上的记录介质层和由介质层上的至少一层薄膜形成的保护层，其保护层的表面被微小地粗糙化以具有凹形粗糙图案，并且基本上不突出超过由保护层的最外表面部分组成的基准水平。当磁光盘通过使用在磁光调制型记录中的符合高频记录的空气浮动磁头的CSS系统进行记录时，其是在磁光盘上重写记录的方法之一，分钟形成在盘基板表面上的凹形粗糙图案防止了磁头粘附到盘表面和盘基片旋转与头部之间的碰撞等问题。

5. 发明授权

US5736235A Magnetic recording medium having at least two magnetic layers with easy axes oriented in the same direction 失效
标题翻译：具有至少两个磁性层的磁记录介质，其容易轴沿相同的方向定向
公开(公告)号：US5736235A
公开(公告)日：1998-04-07
申请号：US740708
申请日：1991-08-06
申请人： Yoshibumi Matsuda , Masaaki Futamoto , Yoshinori Miyamura , Tokuho Takagaki , Hisashi Takano , Fumio Kugiya , Takeshi Nakao , Kyo Akagi , Mikio Suzuki , Hirotsugu Fukuoka , Takayuki Munemoto
发明人： Yoshibumi Matsuda , Masaaki Futamoto , Yoshinori Miyamura , Tokuho Takagaki , Hisashi Takano , Fumio Kugiya , Takeshi Nakao , Kyo Akagi , Mikio Suzuki , Hirotsugu Fukuoka , Takayuki Munemoto
IPC分类号： G11B5/64 , G11B5/65 , G11B5/66 , G11B5/73 , G11B5/738 , G11B5/85 , G11B5/851
CPC分类号： G11B5/66 , G11B5/64 , Y10S428/90 , Y10T428/24942 , Y10T428/2495
摘要： A magnetic recording medium, its fabrication method, and a magnetic recording apparatus in which both saturation induction and coercive force of a magnetic film is made high as they are near a surface of the recording medium. A high density information recording can be made higher than 50 kFCI in linear recording density even for spacing around 0.2 .mu.m.
摘要翻译：一种磁记录介质，其制造方法和磁记录装置，其中磁记录介质的表面附近磁饱和感应和磁性膜的矫顽力均较高。即使对于0.2μm左右的间隔，高密度信息记录也可以使线性记录密度高于50kFCI。

6. 发明申请

US20060152862A1 Magnetoresistance effect elements, magnetic heads and magnetic storage apparatus 失效
标题翻译：磁阻效应元件，磁头和磁存储装置
公开(公告)号：US20060152862A1
公开(公告)日：2006-07-13
申请号：US11371244
申请日：2006-03-09
申请人： Ryoichi Nakatani , Masahiro Kitada , Naoki Koyama , Isamu Yuito , Hisashi Takano , Eijin Moriwaki , Mikio Suzuki , Masaaki Futamoto , Fumio Kugiya , Yoshibumi Matsuda , Kazuo Shiiki , Yoshinori Miyamura , Kyo Akagi , Takeshi Nakao , Hirotsugu Fukuoka , Takayuki Munemoto , Tokuho Takagaki , Toshio Kobayashi , Hideo Tanabe , Noboru Shimizu
发明人： Ryoichi Nakatani , Masahiro Kitada , Naoki Koyama , Isamu Yuito , Hisashi Takano , Eijin Moriwaki , Mikio Suzuki , Masaaki Futamoto , Fumio Kugiya , Yoshibumi Matsuda , Kazuo Shiiki , Yoshinori Miyamura , Kyo Akagi , Takeshi Nakao , Hirotsugu Fukuoka , Takayuki Munemoto , Tokuho Takagaki , Toshio Kobayashi , Hideo Tanabe , Noboru Shimizu
IPC分类号： G11B5/33
CPC分类号： G11B5/398 , B82Y10/00 , B82Y25/00 , G01R33/093 , G11B5/3903 , G11B5/3909 , G11B5/3929 , G11B5/3967 , G11B2005/0002 , G11B2005/0016 , G11B2005/3996 , H01F10/324 , H01F10/3254 , H01F10/3268 , H01L43/08 , Y10T29/49032 , Y10T29/49043 , Y10T29/49044 , Y10T29/49155
摘要： The magnetoresistance effect element is of a multilayered structure having at least magnetic layers and an intermediate layer of an insulating material, a semiconductor or an antiferromagnetic material against the magnetic layers, and the magnetoresistance effect element has terminals formed at least on the opposite magnetic layers, respectively, so that a current flows in the intermediate layer. The film surfaces of all the magnetic layers constituting the magnetoresistance effect element are opposed substantially at right angles to the recording surface of a magnetic recording medium. Therefore, the area of the magnetic layers facing the recording surface of the magnetic recording medium can be extremely reduced, and thus the magnetic field from a very narrow region of the high-density recorded magnetic recording medium can be detected by the current which has a tunneling characteristic and passes through the intermediate layer.
摘要翻译：磁阻效应元件是至少具有磁性层和抵抗磁性层的绝缘材料，半导体或反铁磁材料的中间层的多层结构，并且磁阻效应元件至少在相对的磁性层上形成端子，从而电流在中间层中流动。构成磁阻效应元件的所有磁性层的膜表面基本上与磁记录介质的记录表面成直角相对。因此，能够极大地降低与磁记录介质的记录面对置的磁性层的面积，因此能够通过电流检测来自高密度记录磁记录介质的非常窄的区域的磁场穿透特性，穿过中间层。

7. 发明授权

US4357616A Recording medium 失效
标题翻译：录音媒体
公开(公告)号：US4357616A
公开(公告)日：1982-11-02
申请号：US131761
申请日：1980-03-19
申请人： Motoyasu Terao , Yoshio Taniguchi , Shinkichi Horigome , Kazuo Shigematsu , Masahiro Ojima , Yoshinori Miyamura , Seiji Yonezawa
发明人： Motoyasu Terao , Yoshio Taniguchi , Shinkichi Horigome , Kazuo Shigematsu , Masahiro Ojima , Yoshinori Miyamura , Seiji Yonezawa
IPC分类号： G11B7/241 , G11B7/243 , G11B7/253 , G11B7/2531 , G11B7/2533 , G11B7/257 , G01D15/34
CPC分类号： G11B7/241 , G11B7/243 , G11B2007/25706 , G11B2007/25708 , G11B2007/2571 , G11B2007/25715 , G11B2007/25716 , G11B7/244 , G11B7/252 , G11B7/2531 , G11B7/2533 , Y10S430/146
摘要： A recording medium having at least a first inorganic material layer which overlies a predetermined substrate and which exhibits a light absorptivity for projected light, and a recording layer which overlies the first inorganic material layer and whose principal component is an organic material. The first inorganic material layer contains at least one element selected from the group consisting of In, Bi, Te, Sb, Ge, Sn, Pb, Cr, Nb, Ni, Pd, Fe, Pt, Re, Ta, Th, Ti, Zr and Tl and the content of the element or elements is at least 65 atomic-%.Further, the first inorganic material layer may well be overlaid with a second inorganic material layer which exhibits a light transmissivity higher than that of this first inorganic material layer. Preferable as the material of the second inorganic material layer is an inorganic material which contains at least one element selected from the group consisting of In, Bi, Te, Sb, Pb, Ge and Sn and at least one element selected from the group consisting of S, Se and O.In proximity to at least one surface of the first inorganic material layer, at least one stabilizing layer may be disposed as well.
摘要翻译：具有至少第一无机材料层的记录介质，所述第一无机材料层覆盖在预定的基板上并且对于投射的光呈现出光吸收性，以及记录层，其覆盖在第一无机材料层上，其主要成分是有机材料。第一无机材料层含有选自In，Bi，Te，Sb，Ge，Sn，Pb，Cr，Nb，Ni，Pd，Fe，Pt，Re，Ta，Th，Ti， Zr和Tl，元素或元素的含量至少为65原子％。此外，第一无机材料层可以很好地覆盖有比第一无机材料层高的透光率的第二无机材料层。优选第二无机材料层的材料是含有选自In，Bi，Te，Sb，Pb，Ge和Sn中的至少一种元素的无机材料，以及选自由以下组成的组中的至少一种元素： S，Se和O.在第一无机材料层的至少一个表面附近，也可以设置至少一个稳定层。

8. 发明授权

US07054120B2 Magnetic apparatus with perpendicular recording medium and head having multilayered reproducing element using tunneling effect 失效
标题翻译：具有垂直记录介质和头部的磁性装置具有使用隧道效应的多层再现元件
公开(公告)号：US07054120B2
公开(公告)日：2006-05-30
申请号：US10700500
申请日：2003-11-05
申请人： Ryoichi Nakatani , Masahiro Kitada , Naoki Koyama , Isamu Yuito , Hisashi Takano , Eijin Moriwaki , Mikio Suzuki , Masaaki Futamoto , Fumio Kugiya , Yoshibumi Matsuda , Kazuo Shiiki , Yoshinori Miyamura , Kyo Akagi , Takeshi Nakao , Hirotsugu Fukuoka , Takayuki Munemoto , Tokuho Takagaki , Toshio Kobayashi , Hideo Tanabe , Noboru Shimizu
发明人： Ryoichi Nakatani , Masahiro Kitada , Naoki Koyama , Isamu Yuito , Hisashi Takano , Eijin Moriwaki , Mikio Suzuki , Masaaki Futamoto , Fumio Kugiya , Yoshibumi Matsuda , Kazuo Shiiki , Yoshinori Miyamura , Kyo Akagi , Takeshi Nakao , Hirotsugu Fukuoka , Takayuki Munemoto , Tokuho Takagaki , Toshio Kobayashi , Hideo Tanabe , Noboru Shimizu
IPC分类号： G11B5/39
CPC分类号： G11B5/398 , B82Y10/00 , B82Y25/00 , G01R33/093 , G11B5/3903 , G11B5/3909 , G11B5/3929 , G11B5/3967 , G11B2005/0002 , G11B2005/0016 , G11B2005/3996 , H01F10/324 , H01F10/3254 , H01F10/3268 , H01L43/08 , Y10T29/49032 , Y10T29/49043 , Y10T29/49044 , Y10T29/49155
摘要： The magnetoresistance effect element is of a multilayered structure having at least magnetic layers and an intermediate layer of an insulating material, a semiconductor or an antiferromagnetic material against the magnetic layers, and the magnetoresistance effect element has terminals formed at least on the opposite magnetic layers, respectively, so that a current flows in the intermediate layer. The film surfaces of all the magnetic layers constituting the magnetoresistance effect element are opposed substantially at right angles to the recording surface of a magnetic recording medium. Therefore, the area of the magnetic layers facing the recording surface of the magnetic recording medium can be extremely reduced, and thus the magnetic field from a very narrow region of the high-density recorded magnetic recording medium can be detected by the current which has a tunneling characteristic and passes through the intermediate layer.
摘要翻译：磁阻效应元件是至少具有磁性层和抵抗磁性层的绝缘材料，半导体或反铁磁材料的中间层的多层结构，并且磁阻效应元件至少在相对的磁性层上形成端子，使得电流在中间层中流动。构成磁阻效应元件的所有磁性层的膜表面基本上与磁记录介质的记录表面成直角相对。因此，能够极大地降低与磁记录介质的记录面对置的磁性层的面积，因此能够通过电流检测来自高密度记录磁记录介质的非常窄的区域的磁场穿透特性，穿过中间层。

9. 发明授权

US06278593B1 Magnetoresistance effect elements and magnetic heads using the tunneling magnetoresistive effect 失效
标题翻译：使用隧道磁阻效应的磁阻效应元件和磁头
公开(公告)号：US06278593B1
公开(公告)日：2001-08-21
申请号：US09468309
申请日：1999-12-21
申请人： Ryoichi Nakatani , Masahiro Kitada , Naoki Koyama , Isamu Yuito , Hisashi Takano , Eijin Moriwaki , Mikio Suzuki , Masaaki Futamoto , Fumio Kugiya , Yoshibumi Matsuda , Kazuo Shiiki , Yoshinori Miyamura , Kyo Akagi , Takeshi Nakao , Hirotsugu Fukuoka , Takayuki Munemoto , Tokuho Takagaki , Toshio Kobayashi , Hideo Tanabe , Noboru Shimizu
发明人： Ryoichi Nakatani , Masahiro Kitada , Naoki Koyama , Isamu Yuito , Hisashi Takano , Eijin Moriwaki , Mikio Suzuki , Masaaki Futamoto , Fumio Kugiya , Yoshibumi Matsuda , Kazuo Shiiki , Yoshinori Miyamura , Kyo Akagi , Takeshi Nakao , Hirotsugu Fukuoka , Takayuki Munemoto , Tokuho Takagaki , Toshio Kobayashi , Hideo Tanabe , Noboru Shimizu
IPC分类号： G11B539
CPC分类号： G11B5/398 , B82Y10/00 , B82Y25/00 , G01R33/093 , G11B5/3903 , G11B5/3909 , G11B5/3929 , G11B5/3967 , G11B2005/0002 , G11B2005/0016 , G11B2005/3996 , H01F10/324 , H01F10/3254 , H01F10/3268 , H01L43/08 , Y10T29/49032 , Y10T29/49043 , Y10T29/49044 , Y10T29/49155
摘要： The magnetoresistance effect element is of a multilayered structure having at least magnetic layers and an intermediate layer of an insulating material, a semicondutor or an antiferromagnetic material against the magnetic layers, and the magneto-resistance effect element has terminals formed at least on the opposite magnetic layers, respectively, so that a current flows in the intermediate layer. The film surfaces of all the magnetic layers constituting the magnetoresistance effect element are opposed substantially at right angles to the recording surface of a magnetic recording medium. Therefore, the area of the magnetic layers facing the recording surface of the magnetic recording medium can be extremely reduced, and thus the magnetic field from a very narrow region of the high-density recorded magnetic recording medium can be detected by the current which has a tunneling characteristic and passes through the intermediate layer.
摘要翻译：磁阻效应元件是至少具有磁性层和抵抗磁性层的绝缘材料，半导体或反铁磁材料的中间层的多层结构，并且磁阻效应元件具有至少形成在相对的磁体上的端子层，使得电流在中间层中流动。构成磁阻效应元件的所有磁性层的膜表面基本上与磁记录介质的记录表面成直角相对。因此，能够极大地降低与磁记录介质的记录面对置的磁性层的面积，因此能够通过电流检测来自高密度记录磁记录介质的非常窄的区域的磁场穿透特性，穿过中间层。

10. 发明授权

US5411430A Scanning optical device and method for making a hybrid scanning lens used therefor 失效
标题翻译：用于制造用于其的混合扫描透镜的扫描光学装置和方法
公开(公告)号：US5411430A
公开(公告)日：1995-05-02
申请号：US950687
申请日：1992-09-25
申请人： Takashi Nishimura , Akira Arimoto , Yoshinori Miyamura , Yumiko Anzai , Yoshimasa Kondo , Fumihiko Uchida , Shigeo Moriyama
发明人： Takashi Nishimura , Akira Arimoto , Yoshinori Miyamura , Yumiko Anzai , Yoshimasa Kondo , Fumihiko Uchida , Shigeo Moriyama
IPC分类号： B23Q1/48 , B23Q1/54 , B24B13/06 , B41J2/47 , G02B26/12 , G05B19/18 , B24B49/00
CPC分类号： B23Q1/5406 , B23Q1/4852 , B24B13/06 , B41J2/471 , G02B26/125 , G05B19/184 , G05B2219/45157
摘要： The present invention provides a hybrid lens having an axially asymmetrical non-spherical shape, good mass productivity, and excellent shape precision surface precision as well as environment resistant property, and a method for fabricating same, as well as a method and a device for a laser printer using that hybrid lens. In particular, there are disclosed a method, by which, when an axially asymmetrical non-spherical convex lens is formed by the replica method, the shape thereof is transcribed with a high precision, as well as a method and a device for fabricating an axially asymmetrical non-spherical concave lens (female die) serving as an original for the transcription. In a device for fabricating a female die by direct grinding, the positions of a rotation axis of an object to be worked and a rotation axis of a grinding wheel are controlled and it has further a function of correcting mounting errors, when the object to be worked and the grinding wheel are mounted.
摘要翻译：本发明提供一种具有轴对称非球面形状，良好的质量生产率和优异的形状精度表面精度以及耐环境性能的混合透镜及其制造方法，以及用于激光打印机使用该混合镜头。特别地，公开了一种方法，当通过复制方法形成轴向不对称非球面凸透镜时，其形状被高精度地转录，以及用于制造轴向非球面凸透镜的方法和装置不对称非球面凹透镜（女模）用作转录的原件。在通过直接研磨制造阴模的装置中，控制被加工物的旋转轴的位置和砂轮的旋转轴的位置，并且还具有校正安装误差的功能，当要被加工的物体工作，砂轮安装。

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