Title:
PRINTED WIRING SUBSTRATE
Document Type and Number:
Japanese Patent JPH01198100
Kind Code:
A
Abstract:
PURPOSE:To define a loop of a magnetic core around wirings on a printed wiring substrate and to decrease noises, by providing openings near predetermined circuit patterns and arranging the magnetic core through these openings so as to define a closed magnetic circuit around the wirings of said predetermined wiring patterns. CONSTITUTION:A printed wiring substrate 1 has wiring patterns 2 thereon. Rectangular holes 3a, 3b are formed near the opposite sides of these circuit patterns 2, respectively. A ferrite core 4 is arranged through the holes 3a, 3b so as to form a loop around the wiring patterns 2. The ferrite core 3 is received in a molded case 7 and fixed to the printed wiring substrate 1 by means of screws 5 and nuts 6. If wiring in a predetermined wiring pattern region is passed through the loop of the magnetic core once or twice or more and a connection switching means is provided in a part of the wiring, the connection switching means can control whether and how many times the wiring is passed through the magnetic core loop.
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Inventors:
ITO TOSHIYUKI
KIMIZUKA JUNICHI
INUYAMA SATOHIKO
KUSANO AKIHISA
KIMIZUKA JUNICHI
INUYAMA SATOHIKO
KUSANO AKIHISA
Application Number:
JP2208288A
Publication Date:
August 09, 1989
Filing Date:
February 03, 1988
Export Citation:
Assignee:
CANON KK
International Classes:
H05K9/00; H01F17/06; H05K1/02; H05K1/18; (IPC1-7): H05K1/02; H05K9/00
Attorney, Agent or Firm:
Yamashita