| abstract |
[PROBLEMS] To provide high connection reliability without breaking wires between a wiring board and an insulating case for housing the wiring board even in an environment where the operating atmosphere tends to be high temperature and the temperature changes drastically. I do. A wiring board (2) having a connection electrode (7) provided on the surface of an insulating board (4) and an insulating material having a larger thermal expansion coefficient than the insulating board (4). An insulating case provided with a connection electrode at a position facing the connection electrode, and a lid for sealing the wiring board in the insulating case; And the connection electrode 9 are electrically connected by a loop-shaped wire 10 having a wire diameter of 500 μm or less. The maximum rising angle of the wire 10 from the connection electrodes 7 and 9 is θ (°), and the connection electrode 7 of the wire 10 is , 9 the maximum loop height is h (m m), the value represented by (θ / h) / h is set to 6 or less. |