Polymer thick film heating element on a glass substrate
First Claim
1. An apparatus for electrically heating a substrate, said apparatus comprising:
- a substrate having a surface, said substrate being a glass material;
a first conductor adhered to said surface;
a second conductor adhered to said surface;
a resistive film adhered to said surface, said resistive film in electrical contact with said first conductor, said resistive film in electrical contact with said second conductor;
a temperature sensor attached to said substrate; and
a controller in electrical communication with said temperature sensor, said first conductor, and said second conductor, said controller having a circuit formed on said substrate.
1 Assignment
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Accused Products
Abstract
Apparatus and methods for attaching a heating element to a glass substrate. The heating element is formed of a plurality of conductive polymer thick film inks screen printed on the substrate. The heating element includes a resistive strip or resistor, conductive strips or conductors, and terminal portions, which form part of an electrical circuit. Electrical power applied to the terminal portions causes current to flow through the resistive strip, which generates heat through resistive heating. The heat is transferred to the substrate. The method of applying the heating element to the substrate includes, in one embodiment, screen printing polymer thick film materials onto a surface of a glass substrate to form the circuit conductors and resistive elements and surface mounting other components of the circuit on the substrate.
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Citations
20 Claims
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1. An apparatus for electrically heating a substrate, said apparatus comprising:
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a substrate having a surface, said substrate being a glass material;
a first conductor adhered to said surface;
a second conductor adhered to said surface;
a resistive film adhered to said surface, said resistive film in electrical contact with said first conductor, said resistive film in electrical contact with said second conductor;
a temperature sensor attached to said substrate; and
a controller in electrical communication with said temperature sensor, said first conductor, and said second conductor, said controller having a circuit formed on said substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus for heating a substrate, said apparatus comprising:
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a substrate having a surface, said substrate being a glass material;
a first conductor adhered to said surface, said first conductor being formed from a first conductive polymer thick film ink;
a second conductor adhered to said surface, said second conductor being formed from a second conductive polymer thick film ink;
a resistive film in contact with said surface, said resistive film being formed from a first polymer thick film carbon ink having a specified conductivity, said resistive film in electrical contact with said first conductor, said resistive film in electrical contact with said second conductor, said resistive film including a plurality of strips, each of said plurality of strips extending from said first conductor to said second conductor, each of said plurality of strips in a spaced apart configuration; and
a temperature sensor attached to said substrate, said temperature sensor being a thermistor. - View Dependent Claims (12, 13, 14)
at least one resistor in contact with said surface, said at least one resistor formed from a second polymer thick film carbon ink having a specified conductivity; at least one interconnecting conductor in contact with said surface, said at least one interconnecting conductor formed from said conductive polymer thick film ink; and
at least one semiconductor mounted on said substrate.
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15. An apparatus for heating a substrate, said apparatus comprising:
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a substrate having a surface, said substrate being a glass material;
a means for heating said substrate;
a means for sensing a temperature of said substrate;
a means for controlling said means for heating; and
a means for connecting said means for controlling to an electrical power supply. - View Dependent Claims (16)
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17. A method of heating a substrate with a resistance heater printed on the substrate, said method comprising the steps of:
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(a) applying a conductive polymer thick film ink to a first selected portion of a surface of a glass substrate wherein said first selected portion includes two areas that are electrically insulated from each other;
(b) applying a resistive polymer thick film ink to a second selected portion of said surface, wherein said resistive polymer thick film ink is in contact with each of said two areas;
(c) applying a first voltage to a controller mounted on said glass substrate;
(d) measuring a temperature of said glass substrate with a surface mounted sensor; and
(e) controlling said first voltage to produce a second voltage applied to said resistive polymer thick film ink and to maintain a selected temperature. - View Dependent Claims (18, 19, 20)
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Specification