Abstract: Speaker module housing and speaker module, the speaker module housing includes front shell with accommodating cavity and back cover fixed to front shell and covering accommodating cavity. Front shell has gate region for injection molding and fixed region opposite to gate region and away from gate region. Thickness of part of front shell between gate region and fixed region is smaller than thickness of fixed region. Speaker module housing further includes plastic structure fixed in accommodating cavity. Plastic structure and front shell are integrally injection-molded, and plastic structure is located in gate region and/or fixed region. Plastic structure is arranged in gate region and/or fixed region of front shell, so that part of front shell located in gate region and fixed region has sufficient plastic thickness, which extends effective holding time of shrinkage position of front shell and reduce risk of shrinkage in fixed region of front shell.

Abstract: A pole plate includes first to third pole pieces formed into one piece. The second pole piece has grooves respectively formed in edges of two long sides of a first surface. Since a ratio of a width of the groove to a width of the pole plate falls between 0 and 0.15, the width of the groove is far smaller than the width of the pole plate. In a width direction of the pole plate, there is a long distance between the two grooves, as well as long distances from a middle of the second pole piece to the two grooves. Therefore, when the two grooves are machined, extrusion on the middle position of the second pole piece can be effectively reduced, and the middle position of the second pole piece is not broken for the extrusion, which does not waste machining cost and improves a machining efficiency.

Abstract: A sounder includes a frame with an accommodating space, a magnetic circuit unit fixed in the accommodating space of the frame, a vibration unit fixed to the frame and spaced apart from the magnetic circuit unit and driven by the magnetic circuit unit to vibrate, and a front cover structure covering the frame and the vibration unit and made of sheet metal. The front cover structure includes a middle protrusion portion, an extension plate extending outward from an edge of the protrusion portion, and an assembly ring provided at an outer edge of the extension plate. The protrusion portion, the extension plate, the assembly ring and the vibration unit define a front cavity. The front cover structure made of the sheet metal with a limited thickness can satisfy requirements of the sounder on the structural strength, assembly stability and internal space, and improves sound production performance of the sounder.

Abstract: A cover plate includes a substrate provided and a bridge structure. The bridge structure includes first and second ribs, and a bridge body. The first rib has first forming fillet formed at junction between the first rib and the substrate, and second forming fillet formed at junction between the first rib and the bridge body. The first and second forming fillets each have a radius greater than 0.6 mm. An included angle formed between a length extending direction of first rib and a plane of bridge body is greater than 120°. The first rib has a width smaller than a width of the second rib. With comprehensive consideration of a bridge angle, a bridge forming angle and a bridge width in design of the bridge structure, the first rib and the second rib are force-balanced, reduces a fracture risk of the rib, and improves a yield of the cover plate.

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 sound device including a frame, a magnet system, and a vibration system; the vibration system includes a diaphragm and a coil fixed to the diaphragm; the diaphragm includes a rectangular dome and an edge surrounding the dome; the dome includes a first protrusion, a second protrusion and a third protrusion recessed towards the coil; the first protrusion extends along a long axis of the dome; the second protrusion extends along a short axis of the dome; two ends of the third protrusion connects with the first protrusion and the second protrusion, respectively; the coil is fixed to the first protrusion and the second protrusion. The third protrusion is located at the corner position and in an arc shape. The third protrusion can effectively reduce the risk of fracture of the dome during vibration deformation and improve the stability of the sound device.

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: Disclosed is a metal shell which can be molded without molding breakages from a metal plate and includes a bottom wall including a first edge and a second edge adjacent to the first edge, a first side wall, a second side wall, a first arc transition part connecting the first edge and the first side wall, a second arc transition part connecting the second edge and the second side wall, a third arc transition part connecting the two side walls, and a spherical transition part located at a junction position of the three arc transition parts and connecting the three arc transition parts. A radius of the third arc transition part is greater than a radius of the first arc transition part and a radius of the second arc transition part. A radius of the spherical transition part is equal to the radius of the third arc transition part.

Abstract: The present disclosure provides a speaker assembly. The speaker assembly includes: a frame, a magnetic circuit system, a vibration system, and a flexible circuit board. The flexible circuit board includes a first mounting portion, a second mounting portion spaced from the first mounting portion for being fixed to the frame, and a pair of elastic arms. Each elastic arm includes a first fixing end connected to the first mounting portion, a first connecting arm extending from the first fixing portion, a second fixing end connected to the second mounting portion, a second connecting arm extending from the second fixing end, and a connecting portion connecting the first connecting arm to the second connecting arm. The two connecting portions of the two elastic arms are connected with each other at the corresponding portions.

Abstract: The present disclosure provides a speaker assembly. The speaker assembly includes: a frame, a magnetic circuit system, a vibration system, and a flexible circuit board. The flexible circuit board includes a first mounting portion, a second mounting portion spaced from the first mounting portion for being fixed to the frame, and a pair of elastic arms. Each elastic arm includes a first fixing end connected to the first mounting portion, a first connecting arm extending from the first fixing portion, a second fixing end connected to the second mounting portion, a second connecting arm extending from the second fixing end, and a connecting portion connecting the first connecting arm to the second connecting arm. The two connecting portions of the two elastic arms are connected with each other at the corresponding portions.