Electric heating – Heating devices – With heating unit structure
Reexamination Certificate
1999-12-29
2001-07-10
Hoang, Tu Ba (Department: 3742)
Electric heating
Heating devices
With heating unit structure
C392S347000
Reexamination Certificate
active
06259075
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a ceramic-resistor heating plate, more particularly, to a ceramic-resistor heating plate, which can prevent the problem of corona discharge.
2. Description of the Prior Art
The ceramic-resistor heating plate uses the infrared radiation to heat the object to be heated. Therefore, the ceramic-resistor heating plate is safer than the convention heater with real fire. However, since the ceramic-resistor heating plate is generally energized by electric power, the spark-induced problem, such as the burning of flock attached to the ceramic-resistor heating plate, is liable to occur. To prevent the above-mentioned problem, the distance between the electrodes of the ceramic-resistor heating plate is required to exceed 2.5 mm-3.0 mm to prevent the corona discharge and spark problem.
FIGS. 1
,
2
and
3
show the structure of the conventional heating plate in an electric heater. The heating plate comprises a wave-shaped conductive fin plate
11
, a ceramic-resistor heating body
12
sandwiched therebetween, lateral frame
13
, and cover
14
. The connector
15
protruded from the cover
14
conducts electric power to the heating body
1
through the fin plate
11
. The front side and back side of the heating body
12
are coated with conductive film
121
and
122
, respectively, for conducting the electric power from the connector
15
. As shown in
FIG. 3
, the distance between the two electrodes (terminals)
110
of the heating body is required to be at least 3 mm to maintain the allowable voltage of the heating body. Therefore, the thickness of the heat body is increased. However, the material is wasted and the power consumption is increased. From the formula, R=&rgr;·L/A, for a fixed value of resistivity &rgr;, the resistance R is proportional to the length L and inversely proportional to area A. The increase of heating body thickness will increase the resistance thereof. Therefore, to make a thinner heating body and maintain normal operation thereof within allowable voltage range is an important design issue.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a heating plate which has a protruded insulating region for affording an extended surface for the electrodes of the fin plate on both sides of the heating body, thus increasing the electrode distance and preventing the corona discharge.
It is another object of the present invention to provide a heating plate wherein the applied region of the conductive is of groove shape, thus increasing the electrode distance and facilitating the assembling operation.
It is still another object of the present invention to provide a heating plate having an insulating and heat-resistant frame enclosing the heating body thereof, thus increasing the electrode distance.
It is still another object of the present invention to provide a heating plate having an insulating and heat-resistant frame of I-shape cross-section, thus increasing the electrode distance.
It is still another object of the present invention to provide a heating plate wherein an insulating ribbon is wrapped around the heating body thereof, thus increasing the electrode distance.
The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing, in which:
REFERENCES:
patent: 4414052 (1983-11-01), Habata et al.
patent: 5057672 (1991-10-01), Bohlender et al.
patent: 5192853 (1993-03-01), Yeh
patent: 5471034 (1995-11-01), Kawate et al.
patent: 5854471 (1998-12-01), Tadokoro et al.
patent: 5995711 (1999-11-01), Fukuoka et al.
Dougherty & Troxell
Hoang Tu Ba
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