Semi-conductive electrical heating device with voids
First Claim
1. An electrical heating device including a layer of semi-conductive material carried on an insulating surface and defining a semi-conductive pattern, and a pair of spaced-apart conductors electrically connected to said semi-conductive pattern, said device being characterized in thata first heating portion of said semi-conductive pattern intermediate said conductors includes a two-dimensional array of areas devoid of semi-conductive material ("voids") within a mesh of semi-conductive material, said voids being arranged such that the centers of the voids forming sets of three adjacent voids are positioned at the corners of equilateral triangles.
4 Assignments
0 Petitions
Accused Products
Abstract
Heating devices, in which a semi-conductor pattern is carried on an insulating surface and a pair of spaced apart electrodes are electrically connected to the semi-conductor pattern, are characterized in that the semi-conductor pattern in at least one heating area of the device defines a two-dimensional array of areas that are devoid of semi-conductor material ("voids") within a continuous "mesh" of semi-conductive material. Preferably, the voids are hexagons arranged with the sides of adjacent hexagons parallel to each other, the centers of adjacent hexagons are at the corners of equilateral triangles, and the overall direction of current flow in the device is not parallel to any of the sides of the triangles.
43 Citations
26 Claims
-
1. An electrical heating device including a layer of semi-conductive material carried on an insulating surface and defining a semi-conductive pattern, and a pair of spaced-apart conductors electrically connected to said semi-conductive pattern, said device being characterized in that
a first heating portion of said semi-conductive pattern intermediate said conductors includes a two-dimensional array of areas devoid of semi-conductive material ("voids") within a mesh of semi-conductive material, said voids being arranged such that the centers of the voids forming sets of three adjacent voids are positioned at the corners of equilateral triangles.
-
4. An electrical heating device including a layer of semi-conductive material carried on an insulating surface and defining a semi-conductive pattern, and a pair of spaced-apart conductors electrically connected to said semi-conductive pattern, said device being characterized in that
a first heating portion of said semi-conductive pattern intermediate said conductors includes a two-dimensional array of areas devoid of semi-conductive material ("voids") within a mesh of semi-conductive material, and said conductors and said voids being arranged such that the centers of the voids forming sets of three adjacent voids are positioned at the corners of triangles, and the overall direction of current flow between said conductors is not parallel to the sides of said triangles.
-
7. An electrical heating device including a layer of semi-conductive material carried on an insulating surface and defining a semi-conductive pattern, and a pair of spaced-apart conductors electrically connected to said semi-conductive pattern, said device being characterized in that
a first heating portion of said semi-conductive pattern intermediate said conductors includes a two-dimensional array of areas devoid of semi-conductive material ("voids") within a mesh of semi-conductive material, said voids being hexagons arranged such that the centers of the voids forming sets of four adjacent hexagons are positioned at the corners of parallelograms.
-
9. An electrical heating device including a layer of semi-conductive material carried on an insulating surface and defining a semi-conductive pattern, and a pair of spaced-apart conductors electrically connected to said semi-conductive pattern, said device being characterized in that
first and second heating portions of said semi-conductive pattern intermediate said conductors each include a respective regular two-dimensional array of areas devoid of semi-conductive material ("voids") within a mesh of semi-conductive material, and said second heating portion of said semi-conductor pattern is contiguous to said first heating portion and has a resistivity (ohms per square) different from that of said first portion.
-
17. An electrical heating device comprising:
-
a substrate; a layer of semi-conductor material carried on an insulating surface of said substrate and defining a semi-conductor pattern including a pair of spaced-apart conductor contact portions and at least one heating portion; and a pair of spaced-apart electrical conductors each of which electrically engages one of said conductor contact portions of said semi-conductor pattern; said device being characterized in that; said heating portion comprises a regular two-dimensional array of areas devoid of semi-conductor material ("voids") within a continuous mesh of semi-conductor material, said voids being circles or polygons and being arranged such that the centers of the voids forming sets of three adjacent voids are positioned at the corners of equilateral triangles. - View Dependent Claims (18, 19, 25, 26)
-
-
20. In an electrical device comprising:
-
a substrate having an insulating surface; and a layer of conductive material carried on said insulating surface of said substrate and defining a conductive pattern, that improvement wherein said pattern comprises a regular two-dimensional array of areas devoid of conductive material ("voids") within a continuous mesh of conductive material, said voids being circles or regular polygons and being arranged such that the centers of the voids forming sets of three adjacent voids are positioned at the corners of equilateral triangles. - View Dependent Claims (21, 22, 23, 24)
-
Specification