Note that, although it is conceivable that the amount of heat dissipation per unit area of the glass plate can be suppressed by forming the vertex portion of the bent portion in an arc shape, this limits the shape of the bent portion to an arc shape. In view of this, as described above, in this embodiment, even if the bent portion is not formed in an arc shape, for example, the amount of heat dissipation per unit area of the glass plate can be suppressed by employing a configuration such as that shown in the aspects 1 to 5, for example. However, with the aspects 1 to 5, if the bent portion is formed in an arc shape, it is possible to further reduce the amount of heat dissipation.

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In particular, the resistance value per unit length of the bent portion in the embodiments is smaller than the resistance value per unit length of the first, third, and fifth parts 85a, 85c, and 85e, thus suppressing heat generation. Therefore, in order to suppress heat generation, the bent portion need not be formed in an arc shape, and even if the bent portion is a sharp corner portion, it is possible to suppress heat generation, for example. However, if the bent portion is formed in an arc shape, it is possible to further suppress heat generation.

7. Modified Examples

Although embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be carried out without departing from the gist of the invention. Note that the following modified examples can be combined as appropriate.

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