초록 ▼

The heater of the present invention includes a paper or plastic substrate on which is printed a semi-conductor pattern (typically a colloidal graphite ink) having (a) a pair of longitudinal stripes extending parallel to and spaced apart from each other and (b) a plurality of identical bars spaced ap

The heater of the present invention includes a paper or plastic substrate on which is printed a semi-conductor pattern (typically a colloidal graphite ink) having (a) a pair of longitudinal stripes extending parallel to and spaced apart from each other and (b) a plurality of identical bars spaced apart from each other and extending between and electrically connected to the stripes. A metallic conductor (typically copper stripping) overlies each of the longitudinal stripes in face-to-face engagement therewith, and the conductors are held in tight engagement with the stripes by a sealing layer that overlies the metallic conductors and is sealed, at opposite sides of the semi-conductor stripe associated with the particular metallic conductor, to portions of the substrate that are free from the printed semi-conductor pattern.

대표청구항 ▼

An electrical heating device comprising: a substrate having an electrically insulating surface a semi-conductor pattern carried on said electrically insulating surface of said substrate, said pattern including a pair of stripes extending longitudinally of said device generally parallel to and spaced

An electrical heating device comprising: a substrate having an electrically insulating surface a semi-conductor pattern carried on said electrically insulating surface of said substrate, said pattern including a pair of stripes extending longitudinally of said device generally parallel to and spaced apart from each other, and a plurality of bars spaced apart from each other and extending between and electrically connected to said stripes, all of said plurality of bars being identical to each other and being identically oriented relative to said stripes and said bars and stripes being arranged so as to provide portions of said substrate intermediate said stripes and adjacent ones of said bars and closely adjacent to and spaced along the longitudinally-extending edges of said stripes that are free from said semi-conductor pattern; a pair of elongated conductors, each of said conductors having a resistivity less than that of said bars and said strips and overlying and in direct electrical engagement with one of said pair of stripes; and an electrically insulating sealing sheet overlying at least one of said conductors and the said one of said pair of stripes associated therewith, said sheet being sealed at one side of said one conductor to said portions of said substrate closely adjacent said one conductor that are free from said semi-conductor pattern and at the opposite side of said one conductor to portions of said substrate closely adjacent the other longitudinal edge of said one conductor that are free from said semi-conductor pattern, whereby said sealing sheet holds said one conductor in tight face-to-face engagement with said one stripe.