Title:
MAGNETIC FLUID
Document Type and Number:
Japanese Patent JPS5863795
Kind Code:
A
Abstract:
PURPOSE: A magnetic fluid, prepared by dispersing fine particles of a magnetic material in a silicon oil, having a small variation in viscosity coefficient by the temperature change, and particularly effective for a magnetic driving system of a speaker.
CONSTITUTION: A magnetic fluid prepared by making fine magnetic particles, e.g. iron, nickel or cobalt, surface-active, and dispersing the particles in a base oil, e.g. a silicone oil. The magnetic fluid is inserted in an opposite gap between a voice coil 2 and a pole piece 3 and an opposite gap between the voice coil 2 and a yoke plate 5 in applying the magnetic fluid to the vibrating system of a speaker.
Inventors:
TAKIGUCHI HARUHISA
KURATA YUKIO
MATSUI KANEKI
KURATA YUKIO
MATSUI KANEKI
Application Number:
JP16140581A
Publication Date:
April 15, 1983
Filing Date:
October 09, 1981
Export Citation:
Assignee:
SHARP KK
International Classes:
H04R9/02; C10M169/04; H01F1/00; H01F1/44; C10N40/14; (IPC1-7): C10M3/44; H01F1/00; H04R9/02
Attorney, Agent or Firm:
Sugiyama Takeshi
Previous Patent: 核酸分子の酸化還元活性を評価する方法および酸化還元活性を有する核酸...
Next Patent: FILTERING MATERIAL OF MAGNETIC FINE POWDER AND THE LIKE
Next Patent: FILTERING MATERIAL OF MAGNETIC FINE POWDER AND THE LIKE