2.8
Ex. 4
23.9
2.9
Ex. 5
23.9
2.8
Ex. 6
23.9
2.6
Ex. 7
24.1
2.8
Ex. 8
24.1
2.8
Ex. 9
24.4
2.7
Ex. 10
24.5
2.7
Ex. 11
24.7
2.7
Comp. Ex.
23.7
2.8
The specifications of the linking portions according to Examples 1 to 11 and the comparative example are as follows. Examples 1 to 6 differ from each other in the length of the bent portions and the width of wire end portions (see FIG. 5(a), for example). Examples 7 and 8 differ from each other in the thickness of the bent portions and the thickness of wire end portions (see FIG. 5(e) for example). With Examples 9 and 10, bypass heating wires were provided (see FIGS. 5(c) and 5(d), for example). With Example 11, a 1 mm circular conductive portion was provided (see FIG. 5(f), for example). On the other hand, with the comparative example, a bent portion such as that in the examples was not provided, and the bent portion and the wire end portion were formed as a single body, and these portions had the same width and the same thickness.
