Circuit board damping mechanism and vehicle-mounted apparatus using same

A circuit board damping mechanism, which is used for fixing a circuit board having one or more through holes to a base plate, wherein the damping mechanism includes:

• one or more fixing bolts, each including a nut and a stud, wherein the stud passes through a through hole and cooperates with a nut to fix the circuit board to the base plate;
• a damping rubber ring sleeved outside the stud, wherein the damping rubber ring has a step shape and includes an upper damping ring portion and a lower bearing ring portion, the upper damping ring portion passes into the through hole to constitute a buffer structure between the stud and an inner end surface of the through hole, and the bearing ring portion is clamped between the circuit board and the base plate to constitute a bearing structure of the circuit board;
• and
• a damping gasket provided between the circuit board and the nut of the fixing bolt.