| 摘要 |
<p>A ratio of an area in which a first exposed portion 12b is formed to an area of a first main surface A (a first value v) is smaller than a ratio of an area in which a second exposed portion 13b to an area of the second main surface B (a second value w). A ratio of the first value v to the second value w is smaller than a ratio of a third value x to a fourth value y, where the third value x is a ratio of an area in which the first connecting portion 12a is formed to an area of a region C, and the fourth value y is a ratio of an area in which the second connecting portion 13a is formed to an area of a region D.</p> |
