Biological object detector, vehicle seat occupancy detector, and seat belt non-wearing warning system

A seat belt non-wearing warning system comprising:

• a vehicle seat occupancy detector including a heat flux sensor installed in a place in a vehicle seat where heat flux emanating from an occupant seated on the seat is detectable, and a seat occupancy determining means for determining whether or not an occupant is seated on the vehicle seat;
• a seat belt wearing determining means for determining, when it is determined by the seat occupancy determining means of the vehicle seat occupancy detector that an occupant is seated on the vehicle seat, whether or not the occupant is wearing a seat belt;
• and
• a warning means for warning, when it is determined by the seat belt wearing determining means that the occupant is not wearing the seat belt, the occupant of the non-wearing of the seat belt,
• wherein
• the heat flux sensor of the vehicle seat occupancy detector has a structure in which a plurality of first and second via holes are formed in an insulating base member made of a thermoplastic resin so as to penetrate the insulating base member in a thickness direction thereof, first and second connecting members formed of different metals are respectively embedded in the first and second via holes, and the first and second connecting members are alternately connected in series,
• at least one of the metals forming the first and second connecting members is a sintered alloy obtained by sintering a plurality of metal atoms in a state of maintaining a crystal structure of the metal atoms, and
• the seat occupancy determining means of the vehicle seat occupancy detector determines whether or not an occupant is seated on the vehicle seat by comparing sensing results of the heat flux sensor with determination criteria, the determination criteria being preset according to heat flux that can be sensed when an occupant is seated on the vehicle seat.