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1. 发明专利

JPS6026670B2 失效
公开(公告)号：JPS6026670B2
公开(公告)日：1985-06-25
申请号：JP95882
申请日：1982-01-08
申请人： HITACHI LTD
发明人： RACHI MIKIO , MARUTA MINORU , ABE AKIHIRO , HIRUTA TSUGIO , FUMIOKA JUN
IPC分类号： B24B7/17

2. 发明专利

JPS58120459A SIMULTANEOUSLY GRINDING DEVICE FOR PLURAL SHEETS OF DISCS 失效
公开(公告)号：JPS58120459A
公开(公告)日：1983-07-18
申请号：JP95882
申请日：1982-01-08
申请人： HITACHI LTD
发明人： RACHI MIKIO , MARUTA MINORU , ABE AKIHIRO , HIRUTA TSUGIO , FUMIOKA JIYUN
IPC分类号： B24B7/17
摘要： PURPOSE:To simultaneously grind plural discs and to obtain desired surface roughness, by providing a grinding means in which the discs are held from both sides and moved in a radial direction of the disc. CONSTITUTION:A main body part 1 comprises a rotatively driven main shaft 2 for rotating discs 4. The disc 4 is provided with a disc holding part fiexdly held by an internal peripheral guide and a bearing box 25 rotatably supporting the disc. A disc grinding part contains grinding wheels 19 arranged in both side positions of the disc 4, cam supporting holding of the wheels 19 for the disc 4 and a shaft 14 longitudinally moving the wheel 19. A reversible motor 8 is rotated, and a linear motion bearing 13 is fitted into a shaft 32 by a feed screw 7 to approximate the disc 4 to the disc grinding part. The shaft 2 is rotated to rotate the disc 4, and the wheels 19 are uniformly operated under pressure to start a finishing work.

3. 发明专利

JPH02242109A CHECKING OF FLATNESS OF MAGNETIC DISC MEDIUM AND SUBSTRATE 失效
公开(公告)号：JPH02242109A
公开(公告)日：1990-09-26
申请号：JP6096489
申请日：1989-03-15
申请人： HITACHI LTD
发明人： ITO RITSU , OTANI YUICHI , YASHIKI HIROSHI , HIRUTA TSUGIO , ITO KIKUICHI , NAKAJIMA YASUO
IPC分类号： G01B11/30
摘要： PURPOSE:To check a flatness of a magnetic disc medium and substrate accurately in a short time with an inexpensive equipment by a method wherein a surface of an object to be measured with white light at an angle of incidence of 25 + or - 20 deg. and a reflection image thereof projected onto a reflector to observe a degree of gradation. CONSTITUTION:An object 1 to be measured as magnetic disc medium or substrate is carried on a rotor 2. The surface of the object 1 to be measured is irradiated with white light at an angle of 25 + or - 20 deg. of incidence from a light source 3 and reflected light thereof is introduced to a reflector 4 to observe a reflection image on the reflector 4. The object 1 to be measured, the rotor 2 and the reflector 4 are covered with a shielding screen 5 to optimize an incident light and the reflected light. When the object 1 to be measured has a good flatness, the reflection image presents an image with a uniform brightness without gradation. When a part of the object 1 to be measured is protruded, the reflection image at the protruded part becomes black (dark). To the contrary, when the part is recessed, the reflection image at the recessed part becomes white (bright). Judgment is performed by comparison with a reference sample for abnormality of the flatness.

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