Abstract: A passenger detection device that determines whether a passenger sits in a passenger seat or backseat, and if YES, determines whether the passenger is an adult or a child, and whether the passenger is sitting in a normal attitude. A pair of thermopile sensors 13 and 14 are disposed on a dashboard 11 at a predetermined distance from each other in a horizontal direction. The pair of thermopile sensors 13 and 14 are disposed such that they monitor a predetermined same position P on a surface of the passenger seat 12 when a passenger 15 does not sit in a passenger seat 12. Output signal which are output from the pair of thermopile sensors 13 and 14 are subtracted by a subtraction circuit 25, an output difference signal of the pair of thermopile sensors 13 and 14 is taken out, and it is detected whether a passenger sits in the seat by this signal.

Abstract: A mattress vibrator comprises a mat having a hard plate and an elastic plate which are laminated on each other, and the mat is provided with a vibration generator, a vibrator which generates vibration by operating a moving body in an axial direction of the vibrator is used as the vibration generator, the vibrator is disposed on substantially a central portion of one end of the hard plate, an axis of the vibrator is disposed within a plate thickness of the hard plate.

Abstract: A thermopile far infrared radiation detection apparatus for crime prevention that is capable of detecting with certainty an intruder who is entering a monitoring space regardless of temperature changes of the space or how fast the intruder enters the space. The detection apparatus utilizes three or more thermopiles to detect an intruder into the space and in which output difference between detection values outputted from a pair of said thermopiles is obtained, and then, the intruder is detected by the comparison between these output differences obtained from different pairs of the thermopiles.