Electric heating – Heating devices – Combined with diverse-type art device
Reexamination Certificate
2000-02-03
2001-06-05
Walberg, Teresa (Department: 3742)
Electric heating
Heating devices
Combined with diverse-type art device
C338S203000, C219S212000
Reexamination Certificate
active
06242713
ABSTRACT:
CROSS REFERENCES TO RELATED APPLICATIONS
This application is based on application No. 98-46515 filed in the Korean Industrial Property Office on Oct. 31, 1998, the content of which is incorporated hereinto by reference.
BACKGROUND OF THE INVENTION
(a) Field of the Invention
The present invention relates to a plane heating element and a manufacturing method thereof, particularly to the plane heating element that does not generate external electromagnetic waves and a manufacturing method thereof, wherein magnetic fields, formed by the currents that flow through both heat generation wires and input terminal, are eliminated and thus prevent the generation of electromagnetic waves harmful to the human body.
(b) Description of the Related Art
A plane heating element, such as a thermotherapeutic device or an electric blanket, generates heat in a predetermined area and is used for healing or providing warmth while contacting the human body.
Electricity is used as a power source whereby the plane heating element generates heat, and electricity forms a magnetic field and generates electromagnetic waves while a current flows. The formation of a magnetic field and the generation of electromagnetic waves vary in proportion with the magnitude of current. Because it is currently believed that electromagnetic waves cause a number of diseases and severe side effects, regulations on electromagnetic waves discharged from a variety of products are being enacted.
Therefore, although the plane heating element needs to resolve the EMF (Electromagnetic Field Frequency) issue, the conventional type of such element cannot easily achieve this.
A conventional heating element is structured such that the heat generation wires, having a resistance coefficient generated due to a zigzag patterned connection of the input wires, form a series circuit in view of a block entity, but form a parallel circuit within the block
In this structure, the current flows in one particular direction through the input wires and heating lines. It also flows in one particular direction through the block entity as well as within the block.
As described above, the conventional heating element comprising input electric wires and heat generation wires has a drawback that these lines form magnetic fields when the current flows in a singular direction through both the input wires and the heat generation wires. This results in the generation of EMF harmful to the human body due to the associated magnetic field.
SUMMARY OF THE INVENTION
The present invention has been made in an effort to solve the above problems.
Therefore, the purpose of the present invention is to provide a plane heating element that operates without generating external electromagnetic waves and a manufacturing method thereof in which the magnetic fields formed by the currents flowing through both heat generation lines and an input terminal are eliminated to thus get rid of electromagnetic frequencies harmful to the human body.
The present invention to achieve the above purpose comprising:
an upper input terminal and a lower input terminal in which each upper wire and lower wire are spaced apart at a predetermined interval and the currents flow in opposite directions through these respective wires;
first heat generation wires that are connected to the upper input terminal at predetermined spaced intervals and which have the same directed current flow as that of the upper input terminal; and
second heat generation wires wherein the same are connected to the lower input terminal at spaced intervals and have the current flow oppositely directed to that of the first heat generation wires.
Accordingly, the upper input terminal and lower input terminal of the heating element receive the oppositely directed currents to each other.
The current that is input through the upper input terminal generates heat when flowing through the first heat generation wires, and the current that is input through the lower input terminal generates heat when flowing through the second heat generation wires.
Since the currents that are input through the upper input terminal and lower input terminal flow opposite to each other, the electromagnetic waves generated by the currents of the two input terminals are offset each other.
In addition, since the currents that are input through the first heat generation wires and the second heat generation wires flow oppositely to each other, the electromagnetic waves generated by the currents of each pair of these heat generation wires are offset each other.
REFERENCES:
patent: 3627988 (1971-12-01), Romaniec
patent: 3755035 (1973-08-01), Olson et al.
patent: 3781514 (1973-12-01), Olson et al.
patent: 4025893 (1977-05-01), Bergersen
patent: 4092626 (1978-05-01), Bergersen
patent: 4361954 (1982-12-01), Ohnmacht et al.
patent: 4910391 (1990-03-01), Rowe
patent: 4933534 (1990-06-01), Cunningham et al.
patent: 5811765 (1998-09-01), Nakagawa et al.
Hwang Jae-Soon
Ju Sung-Nam
Kim Cheol-Sang
Kim Seo-Kon
Yang Kun-Ho
Baker & Botts L.L.P.
Dahbour Fadi H.
Solco Biomedical Co., Ltd.
Walberg Teresa
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