The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 22, 2001
Filed:
May. 01, 1998
Masahiro Tadokoro, Hitachioota, JP;
Junichi Hirota, Hitachi, JP;
Kazuo Hiramoto, Hitachioota, JP;
Masumi Umezawa, Hitachi, JP;
Yoshihisa Iwashita, Uji, JP;
Other;
Abstract
An electromagnet comprises a pair of magnetic pole,and,, a return yoke,, exciting coils,and,, etc. In an interior portion of a magnetic pole, plural spacers,are provided putting side by side in a horizontal direction. Each of the spaces,is an air layer and a longitudinal cross-section is a substantially rectangular shape and the space has a lengthily extending slit shape in a vertical direction against a paper face in FIG.,The plural spaces are mainly arranged toward a right side from a beam orbit center O and an interval formed between adjacent spaces is narrower toward the right side. The electromagnet having a simple magnetic pole structure and a wide effective magnetic field area in a case where a maximum magnetic field strength is increased can be secured.