Invention Grant
US3873912A Method and apparatus for forming on a moving magnetic material a magnetized mark of prescribed width regardless of variations of speed of moving magnetic body
失效
用于在移动磁性材料上形成具有规定宽度的磁化标记的方法和装置，而不管运动磁体的速度如何变化
- Patent Title: Method and apparatus for forming on a moving magnetic material a magnetized mark of prescribed width regardless of variations of speed of moving magnetic body
- Patent Title (中): 用于在移动磁性材料上形成具有规定宽度的磁化标记的方法和装置，而不管运动磁体的速度如何变化
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Application No.: US40552973Application Date: 1973-10-11
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Publication No.: US3873912APublication Date: 1975-03-25
- Inventor: MORI TOSHIHIRO , ANDO SEIGO , WATANABE KATSUJIRO , YAMADA TAKEO
- Applicant: NIPPON KOKAN KK
- Assignee: Nippon Kokan Kk
- Current Assignee: Nippon Kokan Kk
- Priority: JP10344672 1972-10-16
- Main IPC: G01D5/245
- IPC: G01D5/245 ; G01B7/04 ; G01P3/54 ; H01F13/00 ; G01R33/12
Abstract:
An apparatus for locally magnetizing moving magnetic material which comprises a coil for locally magnetizing the traveling magnetic material and a coil for detecting the magnetic flux of a locally magnetized spot, both coils being linearly arranged aside the magnetic material in its traveling direction; a pulse current generator for supplying the magnetizing coil with pulse current; an extraction device for extracting a signal denoting the speed of the traveling magnetic material out of a detection signal delivered from the magnetized spot-detecting coil; and a control device for controlling by the extracted signal the time width of output pulse current from the pulse current generator so as to cause the locally magnetized spot to have a fixed length extending along the magnetic material regardless of its traveling speed.
Information query
IPC分类:
