Patent ID: 8653422

Claim:
A heater comprising: an elongated substrate having longitudinal and lateral dimensions; and first and second heat generation lines configured to generate heat, the first and second heat generation lines being provided on the substrate along the longitudinal direction thereof, each of the first and second heat generation lines including a plurality of heat blocks which are electrically connected in series, wherein each of the heat blocks includes first and second conductive members provided on the substrate along the longitudinal direction of the substrate and a plurality of heat generating resistors connected in parallel between the first conductive member and the second conductive member, wherein the positions of the heat blocks of the first heat generation line are shifted from those of the heat blocks of the second heat generation line in the longitudinal direction of the substrate so that the end of the heat block in the first heat generation line does not overlap with the end of the heat block in the second heat generation line in the longitudinal direction of the substrate.