A diaphragm for sensing sound pressure faces a back plate including a plate portion and a fixed electrode film to form a capacitance type acoustic sensor. An upper end of the screen having a weight bar attached to a lower end thereof, is fixed to the take-up pipe, so that the take-up pipe is rotated in forward and reverse directions by a motor 5 to wind up and down the screen. The elastic part has a first silicon part that is mainly made of silicon and a first resin part that is mainly made of resin and coupled to the first silicon part. A processing device is employed whose tool spindle is movably supported in the direction of the feeding movement on leaf springs on the feeding device. A method of providing a vehicle with an on-board optical time domain reflectometer is also disclosed. A first box in the plurality of boxes at the location of the first gesture is determined.