초록 ▼

An electrical heater having a plurality electrodes disposed adjacently on a substrate in spaced apart relation and interconnected by a thermistor material, for example a positive temperature coefficient material. The electrodes each have at least one end portion and preferably two opposite end porti

An electrical heater having a plurality electrodes disposed adjacently on a substrate in spaced apart relation and interconnected by a thermistor material, for example a positive temperature coefficient material. The electrodes each have at least one end portion and preferably two opposite end portions coupled to corresponding electrical terminal located at a common termination zone on the substrate. A spacing between adjacent electrodes may vary and adjacent electrodes may include interdigitated portions to vary the heat produced on select portions of the substrate.

대표청구항 ▼

1. An electrical heater, comprising:a substrate; a plurality of first, second and third electrodes disposed on the substrate in spaced apart relation; the second electrode located between the first and third electrodes; the first, second and third electrodes each having opposite end portions located

1. An electrical heater, comprising:a substrate; a plurality of first, second and third electrodes disposed on the substrate in spaced apart relation; the second electrode located between the first and third electrodes; the first, second and third electrodes each having opposite end portions located at a common termination zone of the substrate; a thermistor material electrically interconnecting the first, second and third electrodes; adjacent portions of the first, second and third electrodes arranged in a generally serpentine pattern on the substrate; a summation of electrical paths along the first and third electrodes from one of the corresponding end portions thereof to adjacent portions of the first and third electrodes is substantially the same; a summation of electrical paths along the first and second electrodes from one of the corresponding end portions thereof to adjacent portions of the first and second electrodes is substantially the same; and a summation of electrical paths along the second and third electrodes from one of the corresponding end portions thereof to adjacent portions of the second and third electrodes is substantially the same.