TWI455612B - Speaker - Google Patents

Description

receiver

The present invention relates to a receiver, and more particularly to a speaker and a receiver in a multimedia handset.

Figure 1 is a longitudinal cross-sectional view of a conventional speaker 100. A conventional speaker 100 (commonly known as a speaker) is made of a permanent magnet 120 and a coil 110. The permanent magnet 120 forms a concentric circle with an N pole at the periphery and an S pole at the inner ring. The coil 110 is floated on the inner ring S pole in a movable manner. The sound signal flows into the coil 110 in the form of a current, and an electromagnetic force is generated between the coil 110 and the permanent magnet 120 due to a change in current. A sound film 102 is connected to the coil 110. Since the electromagnetic force changes rapidly with the sound source signal, the coil 110 drives the sound film 102 to vibrate to emit sound.

The above-mentioned pronunciation principle has been widely applied to various products on the market. Although the patterns have different variations, the structures of the coil 110 and the permanent magnet 120 are similar. Taking the receiver in the mobile phone as an example, since the sound film 102 must be fixed on the coil 110, modal vibration is easily generated during the vibration, and the coil 110 is pulled and the sound is distorted. When the vibration is excessively large, it is more likely to cause the bass to be insufficient or even to break the coil 110. In view of this, an improved speaker structure is yet to be developed.

One of the embodiments of the present invention is a receiver. It mainly consists of an electromagnet and a sound film. The electromagnet can generate a magnetic field change according to an audio source signal. The sound film is adjacent to the electromagnet without contact, and the surface comprises a magnetic material that senses a change in the magnetic field of the electromagnet. When the electromagnet generates a magnetic field change, the sound film vibrates to emit a sound.

The magnetic material is attached to the one side surface or both side surfaces of the sound film by plating or adhesive. The receiver is embodied in a shell and contains a space. The electromagnet is fixed to the shell layer, and the sound film is suspended in the shell layer. The sound film is suspended in the shell layer through a hanging edge. The sound film causes the empty space in the shell to be a first cavity and a second cavity. A sound hole is opened in the first cavity for transmitting the sound emitted by the sound film to the outside. At least one side of the air hole is opened in the second cavity for balancing the air pressure of the second cavity.

In another embodiment of the invention, a double coil configuration is employed. A first electromagnet is fixed in the first cavity, and a second electromagnet is fixed in the second cavity. When the first electromagnet and the second electromagnet generate a magnetic field change, the sound film vibrates to emit a sound.

The following examples specifically illustrate how the invention can be carried out in a preferred manner. The examples are for illustrative purposes only, and are not intended to limit the scope of the invention. The actual scope is subject to the scope of the patent application.

The present invention provides an improved speaker structure. Conventional coils are not fixed, and the electromagnet of the present invention is fixed to the base. On the other hand, the conventional sound film is fixed to the coil, and the sound film of the present invention is not in contact with the electromagnet. More specifically, the present invention transforms the surface of the sound film into a magnetic material, and directly induces a change in the magnetic force of the electromagnet to generate vibration.

Fig. 2a is a receiver 200a which is one of the embodiments of the present invention. The main components in the receiver 200a are an electromagnet 206 and a sound film 212. The electromagnet 206 can generate a magnetic field change according to an audio source signal. According to Ampere's right-hand rule, changes in the current in the coil cause a change in the magnetic field. In the present embodiment, the magnetic circuit generated by the electromagnet 206 is indicated by magnetic lines of force 240. As shown in Fig. 2a, a sound film 212 is disposed above the electromagnet 206 and is adjacent to the electromagnet 206 without contact. The surface of the sound film 212 includes a magnetic material 214 that senses the change in the magnetic field of the electromagnet 206. Thereby, when the electromagnet 206 generates a magnetic field change, the sound film 212 is subjected to an upward or downward suction force, and vibrates to emit a sound.

In this embodiment, the magnetic material 214 may be attached to the surface of the sound film 212 by electroplating, or may be adhered. Further, the magnetic material 214 may be attached to a single side surface or both side surfaces of the sound film 212. The magnetic material 214 itself is a permanent magnet made by magnetic or magnetic magnetic means, and therefore has an N pole and an S pole, and is longitudinally distributed on the sound film. The upper and lower surfaces of 212. Furthermore, the sound film 212 itself may be made directly of the material of 214 and directly have a permanent magnetic force.

The receiver 200a is packaged in a space contained within a shell 210. The sound film 212 is suspended in the shell layer 210 through a hanging edge 216 such that the space in the shell layer 210 is an upper cavity 220 and a lower cavity 230. In other words, the sound film 212 is disposed at a position where the magnetic force of the inductive electromagnet 206 changes, but is not fixed to the electromagnet 206, and is not even in contact with the electromagnet 206.

On the other hand, the electromagnet 206 is directly fixed to the shell 210, and this stable structure has many advantages. For example, the fixed electromagnet 206 is relatively stable, is not easy to fall off or tear, and can withstand strong magnetic field changes and vibration capabilities. In addition, the fixed structure is relatively heat-resistant, so it can withstand the processes of automatic parts, surface treatment, welding, and tin solder, which makes the manufacturing process more simplified.

In the upper cavity 220 of the shell layer 210, a sound hole 202 is opened in the vicinity of the sound film 212, so that the sound emitted by the sound film 212 can be externally transmitted. In order to balance the air pressure in the shell 210, at least one side of the air holes 204 is also included in the lower cavity 230.

The material of the shell layer 210 may be an iron shell. The receiver 200a is particularly suitable for implementation in a multimedia handset. In addition to improvements in volume and sound quality, durability has also increased.

Figure 2b is another embodiment of the receiver of the present invention. In order to enhance the effect of the magnetic field change, a double coil structure can be employed. As shown in FIG. 2b, one electromagnet 206 is disposed below the sound film 212, and one electromagnet 208 is disposed above the sound film 212. When the electromagnet 206 generates suction force to the sound film 212 by the arrangement of the coil current, the electromagnet 208 generates a pulling force to the sound film 212. In contrast, when the electromagnet 206 generates a tensile force to the sound film 212, the electromagnet 208 generates a suction force to the sound film 212. This up-and-down interaction is called the push-pull effect.

Similar to the embodiment of Figure 2a, the receiver 200b is primarily comprised of a shell 210 that includes a space. A sound film 212 is suspended in the shell layer 210 to divide the space into an upper cavity 220 and a lower cavity 230. The electromagnet 208 is fixed in the upper cavity 220 adjacent to the upper surface of the sound film 212 without contact. The electromagnet 206 is fixed in the lower cavity 230 adjacent to the lower surface of the sound film 212 without contact. Both simultaneously generate a magnetic field change based on an audio source signal to form a push-pull effect.

In Fig. 2b, the magnetic line 240 forms a wide range of magnetic circuits, and the sound film 212 is located in the middle, so that the induced thrust and pulling force are relatively uniform. A magnetic material 214 is added to the surface of the sound film 212. The N pole and the S pole are located on the upper surface and the lower surface, respectively, and the magnetic field changes of the electromagnet 206 and the electromagnet 208 can be sensed. When the electromagnet 206 and the electromagnet 208 generate a magnetic field change, the sound film 212 vibrates to emit a sound.

In the present embodiment, the material of the suspension 216 is substantially elastic so that the sound film 212 vibrates between the electromagnet 208 and the electromagnet 206. The invention does not limit the materials and the manner in which it is actually employed. Similar to the embodiment of FIG. 2a, the shell layer 210 includes at least one sound hole 202, an opening in the upper cavity 220, and at least one side air hole 204, and an opening in the lower cavity 230 for balancing the shell. The gas pressure in layer 210. The above embodiment illustrates the spirit of the magnetic sound film and the fixed coil of the present invention, but in practice the design of the receiver can have many different styles, and the present invention is not limited to its external style. This embodiment is particularly applicable to a multimedia mobile phone, but the same principle can be applied to other sounding devices, and the present invention is not limited thereto.

While the invention has been described above by way of a preferred embodiment, it is understood that the scope of the invention is not necessarily limited. In contrast, any modifications that are obvious to those skilled in the art or to those skilled in the art are within the scope of the invention. Therefore, the scope of patent claims must be interpreted in the broadest sense.

100‧‧‧Speakers

102‧‧‧ sound film

110‧‧‧ coil

120‧‧‧ permanent magnet

200a, 200b‧‧ ‧ receiver

202‧‧‧ sound hole

204‧‧‧ side air holes

206, 208‧‧‧ electromagnet

210‧‧‧ shell

212‧‧‧ sound film

214‧‧‧ Magnetic materials

216‧‧‧ hanging edge

220‧‧‧Upper cavity

230‧‧‧ lower cavity

240‧‧‧ magnetic lines

Fig. 1 is a schematic view of a conventional horn structure; and Figs. 2a and 2b are embodiments of the receiver of the present invention.

200b‧‧ ‧ Receiver

202‧‧‧ sound hole

204‧‧‧ side air holes

206, 208‧‧‧ electromagnet

210‧‧‧ shell

212‧‧‧ sound film

214‧‧‧ Magnetic materials

216‧‧‧ hanging edge

220‧‧‧Upper cavity

230‧‧‧ lower cavity

240‧‧‧ magnetic lines

Claims (4)

A receiver comprising: a shell layer comprising a space; a sound film suspended in the shell layer to divide the space into a first cavity and a second cavity; a first electromagnet fixed to the first a cavity adjacent to the upper surface of the sound film without contact for generating a magnetic field change according to a sound source signal; a second electromagnet fixed in the second cavity adjacent to the lower surface of the sound film Not contacting, for generating a magnetic field change according to the sound source signal; wherein: the surface of the sound film comprises a magnetic material, which can sense a magnetic field change of the first electromagnet and the second electromagnet; and when the first electromagnet and the first When the electromagnet changes the magnetic field, the sound film vibrates to produce a sound. The receiver of claim 1, wherein the magnetic material is attached to the one-side surface or both side surfaces of the sound film by electroplating or adhesive. The receiver of claim 1, further comprising a hanging edge for suspending the sound film in the shell. The receiver of claim 1, wherein the shell layer comprises: At least one sound hole is opened in the first cavity for transmitting the sound emitted by the sound film; and at least one side air hole is bored in the second cavity for balancing the air pressure of the second cavity.