Patent ID: 7509871

Claim:
An occupant load sensor for a vehicle, comprising: a strain member adapted to be fixed at both ends at a fixing surface provided at one of a floor side fixing member and a seat side fixing member with a predetermined distance from the fixing surface in a vertical direction of a seat; a connecting member vertically fixed at a center of the strain member, the connecting member adapted to be fixed at the other one of the floor side fixing member and the seat side fixing member; a strain gauge attached to a surface of the strain member between each of the ends and the center of the strain member; an upper bracket having a fixed portion at each end thereof fixed to a back surface of the strain member at the both end and an attachment portion connecting the each fixed portion and extending at a side of the strain member in a lateral direction of the seat; an amplifier case attached to the attachment portion of the upper bracket and arranged in parallel with the strain member; an amplifier substrate enclosed in the amplifier case and placed on an identical plane to the surface of the strain member for amplifying a signal transmitted from the strain gauge; an FPC substrate connected to the strain gauge between each of the ends and the center of the strain member and connected to the amplifier substrate; a coating portion made of resin for coating a connection portion between the FPC substrate and the strain gauge; and a low pressure molded portion made of resin, the low pressure molded portion molded with a hot melt resin by low pressure molding in the amplifier case so as to cover the amplifier substrate and the connection portion between the FPC substrate and the strain gauge.