Moving iron sounding device
A moving iron sounding device includes a casing, a diaphragm sounding system, and a magnetic circuit system. The magnetic circuit system includes a dual-rectangle-shaped magnetic circuit, an inductance coil, and an armature. The diaphragm sounding system includes a support ring and a composite diaphragm. The composite diaphragm includes a diaphragm sheet and a metal sheet. One end of the metal sheet is welded to the vibration portion through a connecting arm, and another end of the metal sheet is connected to the support ring. The present invention achieves a stable connection of the diaphragm sounding system and the magnetic circuit system and ensures the quality of the product. During the process of assembly, the adhesive won't be spilled on the diaphragm.
1. A moving iron sounding device, comprising a casing, a diaphragm sounding system, and a magnetic circuit system, the diaphragm sounding system and the magnetic circuit system being located in the casing; the magnetic circuit system comprising a dual-rectangle-shaped magnetic circuit, an inductance coil, and an armature, the armature having a vibration portion, the vibration portion passing through the inductance coil, a free end of the vibration portion being suspended in the dual-rectangle-shaped magnetic circuit; the diaphragm sounding system including a support ring and a composite diaphragm, the support ring having an opening, the composite diaphragm being disposed on top of the support ring to cover the opening of the support ring; the composite diaphragm including a diaphragm sheet and a metal sheet which are composited to become one-piece; a first end of the metal sheet being connected with the vibration portion, an interval being defined between the first end of the metal sheet and an inner wall surface of the opening of the support ring, a second end of the metal sheet being directly attached to the support ring, the metal sheet being connected with a connecting arm, a distal end of the connecting arm being provided with a welding portion, the welding portion being welded to the free end of the vibration portion;
wherein a distal end face of the second end of the metal sheet is attached to the inner wall surface of the support ring, an upper surface of the second end of the metal sheet is flush with an upper surface of the support ring; a circumferential edge of the diaphragm sheet extends out of the second end of the metal sheet to be attached to the upper surface of the support ring, or the distal end face the second end of the metal sheet is flush with a corresponding end face of the diaphragm sheet, and the second end of the metal sheet is directly attached to the upper surface of the support ring.
2. The moving iron sounding device as claimed in claim 1 , wherein the inner wall surface of the support ring is further formed with a cavity, the cavity penetrates the upper and lower surfaces of the support ring, the distal end face of the second end of the metal sheet is attached to an inner wall surface of the cavity, an inner bottom portion of the cavity is provided with adhesive, the adhesive is disposed between a bottom face of the metal sheet and the inner wall surface of the cavity.
3. The moving iron sounding device as claimed in claim 1 , wherein the metal sheet comprises a dual-rectangle-shaped frame portion and a vibration arm portion suspended in the dual-rectangle-shaped frame portion, one end of the dual-rectangle-shaped frame portion is integrally formed with an inner wall surface of the dual-rectangle-shaped frame portion, another end of the vibration arm portion is suspended and connected with the vibration portion, the diaphragm sheet corresponds in shape to the dual-rectangle-shaped frame portion, the diaphragm sheet is adhered to the dual-rectangle-shaped frame portion, and a raised arc portion is integrally formed between the vibration arm portion and the dual-rectangle-shaped frame portion.
4. The moving iron sounding device as claimed in claim 1 , wherein the armature includes a substrate, two retaining walls, and the vibration portion, the vibration portion extends right from a right end of the substrate and then is bent reversely, the free end of the vibration portion extends left, two sides of the substrate are provided with side walls, and left ends of the side walls extend left to form the retaining walls, respectively.
5. The moving iron sounding device as claimed in claim 1 , wherein the welding portion is integrally formed with the distal end of the connecting arm; or the extension arm and the connecting arm are formed separately and the welding portion is welded to the distal end of the connecting arm; the welding portion has a first welding face, an end face of the free end of the vibration portion is defined as a second welding face, the first welding face is attached to the second welding face; the welding portion is formed with a through groove for welding, the through groove penetrates the first welding face to another opposing face of the welding portion, the second welding face is exposed corresponding to the through groove; the through groove is located at one side or two sides of the welding portion; the through groove is formed with an opening at the side of the welding portion to penetrate an outside thereof, and the second welding face extends toward the outside of the opening and out of the opposing face of the welding portion.