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Patent Searching and Data


Title:
NOISE FILTER
Document Type and Number:
Japanese Patent JPS6012809
Kind Code:
A
Abstract:

PURPOSE: To obtain a noise filter characterized by the small number of parts, simple assembling, reinforcement, and a surge voltage absorbing function by using semiconductor ferrite having surge voltage absorption and noise interrupting functions to constitute the filter.

CONSTITUTION: A filter element body 11 forms electrostatic capacity between electrode films 12 and 13 by oxidizing the surface of a constitutional iron semiconductor material or a particle field and is provided with the surge absorbing function for absorbing the surge voltage applied between the electrode films 12 and 13. Since the body 11 consists of an iron semiconductor material circumscribed to a center conductor 14, the body 11 acts as inductance to the conductor 14. Therefore, the body 11 constitutes a filter 15 having a distribution constant type equivalent circuit using one end 14a of the conductor and the electrode film 13 as an input terminal and the other end 14b of the conductor 14 and the electrode film 13 as an output terminal. The filter 15 acts as a noise filter usually, and when the abnormal voltage due to falling of thunderbolt or the generation of static electricity is applied, acts as a varistor.


Inventors:
OI, Takaaki
Fukutani, Iwao
Application Number:
JP1983000120870
Publication Date:
January 23, 1985
Filing Date:
July 02, 1983
Export Citation:
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Assignee:
MURATA MFG CO LTD
International Classes:
H03H7/075; H03H1/00; (IPC1-7): H03H7/01