Abstract: Three reflector plates comprising: a lateral reflector plate having two half plates each opposingly placed across a rotation supporting shaft introduced therebetween, a longitudinal reflector plate having two half plates each opposingly placed across the rotation supporting shaft therebetween, and a bottom reflector plate placed at the central portion of the rotation supporting shaft, wherein these three reflector plates are brought into mutual orthogonal intersection at their diameters, and the rotation supporting shaft is provided with an inclination supporting hole with an inclination of a "detection design angle", thereby enabling to maintain the detection design angle when in use and enabling to easily assemble into the shape for use even in case of emergency, and further enabling the reflector plates to be stacked flat one upon another and stored free from bulkiness when not in use.

Abstract: A lateral reflector plate comprising two rotatable half plates mutually opposed through a rotation supporting shaft introduced therebetween, and a longitudinal plate comprising two half plates mutually opposed through the rotation supporting shaft introduced therebetween are vertical to each other, and a foldable bottom reflector plate comprising four quarter plates is intersected orthogonally with the lateral and longitudial reflector plates, and also the rotation supporting shaft is provided with an inclination supporting hole with an inclination of the detection design angle.