| 摘要 |
A heat generating element (2) in a heat generating unit has an expandable shape having: a plurality of first slits (2a) each formed at an oblique angle with respect to corresponding one of both edge portions opposing to each other along the longitudinal direction of the heat generating element; and a plurality of second slits (2b) arranged at prescribed intervals alternating with the plurality of first slits (2a) in parallel thereto. The plurality of second slits (2b) are formed at the central portion in the width direction of the heat generating element, so as to form a current path at each of edge portions respectively located between the second slits and a pair of both edge portions opposing to each other along the longitudinal direction of the heat generating element.
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