Abstract: The present invention provides a flexible circuit board and a multifunctional acoustic device. The flexible circuit board includes a first fixation portion, a second fixation portion spaced apart from the first fixation portion, and a connection portion connecting the first and the second fixation portion. The connection portion bends and extends obliquely and upwardly from an end of the first fixation portion, so that the connection portion forms a first convex portion higher than a plane of the first fixation portion. The multifunctional acoustic device includes a frame, a magnetic circuit system, a sounding unit, and a motor. The motor includes the flexible circuit board above. By reversely bending the arm of the flexible circuit board, the stress concentration area of the arm is avoided, and the fatigue life of the arm is greatly improved by changing the shape of the arm of the flexible circuit board.

Abstract: The present disclosure discloses a flexible printed circuit board having a high reliability and includes an elastic arm, and a first end and a second end respectively extending from two ends of the elastic arm. A part of the elastic arm is provided with a thinning portion for changing stiffness distributions of the elastic arm during vibrating. The present disclosure also discloses a speaker using the flexible printed circuit board.

Abstract: A method for regulating climate, comprising: 1) allowing the formation of a relatively high temperature zone and a low temperature zone in the air above the ground; 2) allowing the formation of air convection between the high temperature zone and the low temperature zone as the cold air in the low temperature zone has a greater density than the hot air in the high temperature zone. A device for regulating climate is, i.e. an automatic air tower. The automatic air tower comprises a column (1) with an air inlet (12) at the bottom, wherein the column comprises a startup unit (13) and a shutdown unit (14) inside and has an air outlet (15) at the top. The aforesaid method and tower can prevent and eliminate the formation of haze and cool the earth's ground.

Abstract: A method for regulating climate, comprising: 1) allowing the formation of a relatively high temperature zone and a low temperature zone in the air above the ground; 2) allowing the formation of air convection between the high temperature zone and the low temperature zone as the cold air in the low temperature zone has a greater density than the hot air in the high temperature zone. A device for regulating climate is, i.e. an automatic air tower. The automatic air tower comprises a column (1) with an air inlet (12) at the bottom, wherein the column comprises a startup unit (13) and a shutdown unit (14) inside and has an air outlet (15) at the top. The aforesaid method and tower can prevent and eliminate the formation of haze and cool the earth's ground.