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.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a sounding device used for speakers, loudspeakers, headphones, and the like, and more particularly, to a moving iron sounding device.

2. Description of the Prior Art

A moving iron sounding device is widely used to speakers, loudspeakers, headphones, and the like. The moving iron sounding device comprises a casing, a diaphragm sounding system, and a magnetic circuit system. The diaphragm sounding system comprises a vibration plate, a resin diaphragm, and a retaining frame. When assembled, the vibration plate is adhered to the bottom of the resin diaphragm, and then the circumferential edge of the resin diaphragm is adhered to the upper surface of the retaining frame to cover the opening of the retaining frame. Because there is a gap between the vibration plate and the inner wall surface of the opening of the retaining frame, the gap is filled with the adhesive for connecting the vibration plate with the retaining frame. When the vibration plate and the resin diaphragm are adhered to the retaining frame, it is not easy to get a precise alignment. When the gap is filled with the adhesive, the adhesive may spill on the reign diaphragm. These factors may impact the quality of the products.

In general, the diaphragm sounding system and the magnetic circuit system are connected by a guide wire. When assembled, one end of the guide wire is welded to a free end of an elastic plate of the magnetic circuit system, and another end of the guide wire is welded or adhered to the diaphragm of the diaphragm sounding system. The assembly is troublesome, and the production efficiency is lower. The connecting joints of the two ends of the guide wire may loosen to influence the functions of the products.

Accordingly, the inventor of the present invention has devoted himself based on his many years of practical experiences to solve this problem.

SUMMARY OF THE INVENTION

The primary object of the present invention is to provide a moving iron sounding device. It is easy to achieve a stable connection of a diaphragm sounding system and a magnetic circuit system, and it is convenient to align a composite diaphragm with a support ring so as to be bound together. The adhesive won't be spilled on the diaphragm so as to ensure the quality of the products.

In order to achieve the aforesaid object, the moving iron sounding device of the present invention comprises a casing, a diaphragm sounding system, and a magnetic circuit system. The diaphragm sounding system and the magnetic circuit system are located in the casing. The magnetic circuit system comprises a dual-rectangle-shaped magnetic circuit, an inductance coil, and an armature. The armature has a vibration portion. The vibration portion passes through the inductance coil. A free end of the vibration portion is suspended in the dual-rectangle-shaped magnetic circuit. The diaphragm sounding system includes a support ring and a composite diaphragm. The support ring has an opening. The composite diaphragm is disposed on top of the support ring to cover the opening of the support ring. The composite diaphragm includes a diaphragm sheet and a metal sheet which are composited to become one-piece. A first end of the metal sheet is connected with the vibration portion. An interval is 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 is directly attached to the support ring. The metal sheet is connected with a connecting arm. A distal end of the connecting arm is provided with a welding portion. The welding portion is welded to the free end of the vibration portion.

The beneficial effect of the present invention is to improve the structure of the diaphragm sounding system. The end of the metal sheet is directly attached to the support ring, such that it is convenient to align the composite diaphragm with the support ring so as to be bound together. This solves the problem of the prior art. The adhesive won't be spilled on the diaphragm to ensure the quality of the products. The metal sheet is bent to extend and form a connecting arm. The connecting arm is connected between the diaphragm sounding system and the magnetic circuit system by welding. It is not hard to process the connection, and the connection is stable. During transportation and use, the connecting joint won't loosen so as to ensure the stability of the products.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

As shown inFIG. 1throughFIG. 10, the present invention discloses a moving iron sounding device. The moving iron sounding device comprises a casing10, a diaphragm sounding system20, and a magnetic circuit system30. The diaphragm sounding system20and the magnetic circuit system30are located in the casing10.

FIG. 1throughFIG. 7shows a first embodiment of the present invention. The casing10includes a main body11and a cover12. The main body11comprises a base and a side wall integrally connected to the base. The cover12is configured to cover an opening at the upper end of the main body11. The diaphragm sounding system20and the magnetic circuit system30are located in the main body11. The diaphragm sounding system20is located above the magnetic circuit system30.

The diaphragm sounding system20includes a support ring201and a composite diaphragm202. The support ring201has an opening. The composite diaphragm202is disposed on top of the support ring201to cover the opening of the support ring201. The composite diaphragm202includes a diaphragm sheet21a metal sheet22which are composited to become one-piece. A first end23of the metal sheet22is bent downward to extend and form a connecting arm223. The connecting arm223is connected with a vibration portion334of the magnetic circuit system30. In an embodiment, the connecting arm and the metal sheet can be designed to be separate. An interval206is defined between the first end23of the metal sheet22and an inner wall surface of the opening of the support ring201. A second end24of the metal sheet22is directly attached to the support ring201. In this embodiment, a distal end face of the second end24of the metal sheet22is attached to the inner wall surface of the support ring201. An upper surface of the second end24is flush with an upper surface of the support ring201. As shown inFIG. 2andFIG. 3, the inner wall surface of the support ring201is further formed with a cavity203for accommodating adhesive. The cavity203penetrates the upper and lower surfaces of the support ring201. The distal end face of the second end24of the metal sheet22is attached to the inner wall surface of the cavity203. An inner bottom portion of the cavity203is provided with adhesive204. The adhesive204is disposed between the bottom face of the metal sheet22and the inner wall surface of the cavity203. A circumferential edge of the diaphragm sheet21extends out of the second end24of the metal sheet22to be attached to the upper surface of the support ring201, as shown inFIG. 3.

As shown inFIG. 4, a welding portion224has a first welding face227. An end face of a free end of the vibration portion334is defined as a second welding face335. The first welding face227is attached to the second welding face335. As shown inFIG. 7, the welding portion224can be directly welded to the second welding face335. As shown inFIG. 4throughFIG. 6, the welding portion224can be formed with a through groove228for welding. The through groove228penetrates the first welding face227to another opposing face of the welding portion224. The second welding face335is exposed corresponding to the through groove228. The through groove228is located at one side or two sides of the welding portion224. In this embodiment, the through groove228is formed with an opening at the side of the welding portion224to penetrate an outside thereof. The second welding face335extends toward the outside of the opening and extends out of the opposing face of the welding portion224. This configuration is beneficial for welding operation and ensures the stability of welding.

The magnetic circuit system30comprises a dual-rectangle-shaped magnetic circuit31, an inductance coil32, and an armature33. The armature33includes a substrate331, two retaining walls333, and a vibration portion334. The vibration portion334extends right from a right end of the substrate331and then is bent reversely. The free end of the vibration portion334extends left. Two sides of the substrate331are formed with side walls332extending upward, respectively. Left ends of the side walls332extend left to form the retaining walls333, respectively. The dual-rectangle-shaped magnetic circuit31is located between the two retaining walls333. The dual-rectangle-shaped magnetic circuit31includes a U-shaped iron piece311, an I-shaped iron piece312, and two magnets313. The I-shaped iron piece312is welded to an opening of an upper end of the U-shaped iron piece312to form a dual-rectangle-shaped configuration. The two magnets313are installed on the U-shaped iron piece311and the I-shaped iron piece312, respectively. The vibration portion334passes through the inductance coil32, and the free end of the vibration portion334is suspended in the dual-rectangle-shaped magnetic circuit31.

The working principle of the moving iron sounding device is described hereinafter. The alternating current signal is transmitted to the inductance coil32. The magnetic field generated by the inductance coil32is conducted to the vibration portion334, enabling the vibration portion334to generate magnetic polarization. Along with the change of the magnetic pole and the change of the intensity of the vibration portion334, the vibration portion334subject to the magnetic force vibrates in the space314defined between the two magnets313. The vibrational frequency is directly transmitted to the composite diaphragm202. By the diaphragm sheet21, the surrounding air is agitated to transmit the sound out through a sound output hole121.

FIG. 8shows a second embodiment of the present invention. The second embodiment is substantially similar to the first embodiment with the exceptions described hereinafter. The design of the connecting arm is different from that of the first embodiment. The lower end of the connecting arm is further connected with an extension arm. The extension arm and the connecting arm are disposed separately. The welding portion224is disposed on the extension arm.

As shown inFIG. 8, the distal end face the second end24of the metal sheet22is flush with the corresponding end face of the diaphragm sheet21. The second end24of the metal sheet22is directly attached to the upper end face of the support ring201. As shown inFIG. 8, the metal sheet22comprises a dual-rectangle-shaped frame portion221and a vibration arm portion222suspended in the dual-rectangle-shaped frame portion221. One end of the dual-rectangle-shaped frame portion221is integrally formed with an inner wall surface of the dual-rectangle-shaped frame portion221. A raised arc portion225is integrally formed between the vibration arm portion222and the dual-rectangle-shaped frame portion221. Another end of the vibration arm portion222is suspended and connected with the vibration portion334. The diaphragm sheet21corresponds in shape to the dual-rectangle-shaped frame portion221. The diaphragm sheet21is adhered to the dual-rectangle-shaped frame portion221. The arc portion225is exposed out of the diaphragm sheet21.

As shown inFIG. 9, there is no arc portion225between the vibration arm portion222and the dual-rectangle-shaped frame portion221. The vibration arm portion222extends horizontally from the dual-rectangle-shaped frame portion221. The metal sheet22is provided with three reinforcement ribs thereon. The reinforcement ribs are formed by pressing. The upper surfaces of the reinforcement ribs are formed with convex portions. The lower surfaces of the reinforcement ribs are formed with corresponding concave portions. The structure as shown inFIG. 8andFIG. 9can be applied to the first embodiment.

To compareFIG. 1withFIG. 10, the sound output hole121, as shown inFIG. 1, is disposed on the top of the cover12. A sound output hole122, as shown inFIG. 10, is disposed at a side of the cover12, corresponding in position to the connecting arm222. The side is provided with a sound guide cylinder123toward the sound output hole122for guiding the sound to output.