Electrical steel sheet for low-noise transformer and...

Inductor devices – Core insulation

Reexamination Certificate

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Reexamination Certificate

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07456724

ABSTRACT:
The present invention provides an electrical steel sheet core for a low-noise transformer capable of effectively lowering noise by suppressing vibration perpendicular to the surfaces of the steel sheets and reducing vibration, and relates to an electrical steel sheet for a low-noise transformer characterized by randomly inserting viscoelastic layers with both viscosity and elasticity into the gaps of the steel sheet lamination layers, and a low-noise transformer formed by using said electrical steel sheet.

REFERENCES:
patent: 5063098 (1991-11-01), Niwa et al.
patent: 5143790 (1992-09-01), Sattinger
patent: 5188698 (1993-02-01), Imai et al.
patent: H-5-251246 (1993-09-01), None
patent: H-7-85457 (1995-03-01), None
patent: H-7-305115 (1995-11-01), None
patent: H-8-45751 (1996-02-01), None
patent: H-8-111322 (1996-04-01), None
patent: H-8-250339 (1996-09-01), None
patent: 2000-82622 (2000-03-01), None
patent: 2000-124044 (2000-04-01), None
patent: 2001-93583 (2000-04-01), None
patent: WO 99/33156 (1999-07-01), None
“Development of Orient Core Hi-B”, OHM '72/2, Feb. 1972, pp. 1-7.
Patent Abstract of Japan, JP 08250339, Sep. 27, 1996.
Patent Abstracts of Japan, JP 62001879, Jan. 7, 1987.

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