| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a ventilation structure of a vehicle instrument, which can efficiently achieve secure of heat radiation structure and suppression of generation of ion migration. <P>SOLUTION: The vehicle instrument includes an instrument panel 20, a control circuit part 50 arranged on the back of the instrument panel 20 to control indication by the instrument panel 20 and a dish-like cover 90 for converting the control circuit 50 on the back of the instrument panel 20. The control circuit part 50 has a circuit board 51 forming a wiring pattern 52 on a mounting surface 51a and a plurality of circuit components 53 include a low temperature comport 53b and a high temperature component 53a higher than the low temperature component 53b. The cover 90 includes a low temperature cover part 90b for covering the low temperature component 53b in a sealed state and a high temperature cover part 90a for covering the high temperature component 53a in a ventilation available state on a position upper than the low temperature component 53b. The low temperature cover part 90b forms a guide recess 92 gradually recessed in a direction of a vent hole 91 formed by the upper high temperature cover part 90a and capable of ventilating air between the inside and outside to guide air by a bottom 92a. <P>COPYRIGHT: (C)2013,JPO&INPIT |
