This application claims the priority benefit of Taiwan application serial no. 103145224, filed on Dec. 24, 2014. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.
1. Field of the Invention
The invention relates to an audio device, and relates particularly to an audio device having a control unit.
2. Description of Related Art
Along with continuously improving industrial technology, electronic products are all developing towards a Lightweight and miniaturized trend. People may use miniaturized electronic products any time any where, such as an MP3 player, a smart phone, a tablet computer or a note book computer and the like to enjoy a variety of media entertainment. No matter what kind of electronic product mentioned above, earphones have already become an indispensable accessory for an electronic product in order for a user to listen to sound information that is provided by the electronic product without disturbing other people. In addition, an earphone may also provide a listener with better sound transmission such that the listener is able to hear clearly and understand the sound content unlike sound that is transmitted in air which may cause an unclear situation. In particular, a user will not be affected during a period when moving, for example, exercising, driving a car, in intense activity or in a noisy environment.
The invention provides an audio device that may improve a problem where the precision of the dimensions and assembly affects the product yield rate.
An audio device of the invention includes a signal cable and a control unit. The control unit includes a case, a metal circuit and a microphone. The case has an appearance surface and an insulating inner surface. The metal circuit is disposed on the insulating inner surface and directly contacted with the insulating inner surface and electrically connected to the signal cable. The microphone is disposed on the insulating inner surface and bonded to the metal circuit.
In an embodiment of the invention the control unit further includes a key disposed on the insulating inner surface and bonded to the metal circuit.
In an embodiment of the invention, the control unit further includes a protective adhesive deposited between a periphery of the key and the insulating inner surface.
In an embodiment of the invention, the case includes a fixing part and a moving part. The metal circuit is located at the fixing part, the moving part is movably assembled to the fixing part and used to press the key.
In an embodiment of the invention, the case further has two line input ports. Inside each of the line input ports 316 there is a blocking structure, a part of the signal cable passing through the line input port is S shaped.
In an embodiment of the invention, the case further has a sound receiving hole, the location thereof is corresponding to the microphone.
In an embodiment of the invention, the case further has an isolation wall encircling the sound receiving hole and the microphone.
In an embodiment of the invention, the metal circuit is formed on the insulating inner surface by electroplating.
In an embodiment of the invention, the case is constructed from a homogeneous material.
In an embodiment of the invention, the signal cable and the metal circuit on the insulating inner surface is adhesively bonded by the conductive adhesive.
In an embodiment of the invention the audio device further includes at least one earphone unit that is electrically connected to the signal cable.
Based on the above, the audio device of the invention omits a circuit board inside a control unit. Therefore, the factors affecting the accuracy of the dimensions and assembly are decreased and it is easy to achieve a better product yield rate.
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
Reference will now be made in detail to the present preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts.
Referring to
The difference compared to conventional techniques where a circuit board is fixed in the case after the circuit is formed on the circuit board, is that in the present embodiment the metal circuit 220 is formed directly on the insulating inner surface 214 of the case 210, omitting the use of a circuit board. In this way, the distance between the top of the microphone 240 and the case 210 above the microphone 240 may be easily controlled within design dimensions because the distance is only be affected by the dimensional error of the case 210, the dimensional error of the microphone 240 and the assembly error when the microphone 240 is fixed to the insulating inner surface 214. In this way, it may be easily assured that the microphone 240 achieves the best sound receiving effect. In addition, the distance between the top of the key 230 and the case 210 that is above the microphone 240 may be easily controlled within design dimensions, and the possibility that the key 230 is continuously pressed by the case 210 and unable to be released is lowered, further increasing the product yield rate.
The case 210 of the present embodiment further has a sound receiving hole 216. The position of the sound receiving hole 216 corresponds with the microphone 240. The metal circuit 220 of the present embodiment is embedded in the insulating inner surface 214 of the case 210. However, the metal circuits of other embodiments may not be embedded in the insulating inner surface 214 of the case 210. In addition, the case 210 of the present embodiment is constructed from homogeneous material, namely the material of the overall case 210 is uniform, and not formed by stacked layers of a plurality of materials such as a typical circuit board. For example, when forming the metal circuit 220, the case 210 having a special material on the insulating inner surface 214 may be adopted, and the portion of the material that has been activated may attract metal ions to be deposited thereon during electroplating and the portion that has not been activated will not have metal ions deposited thereon during electroplating. Therefore, a metal circuit 220 with a pattern desired by a designer may be formed on the insulating inner surface 214. In addition, the control unit 200 also may selectively include a conductive adhesive 252 and a protective adhesive 254. The conductive adhesive 252 is used to adhesively bond the signal cable 54 and the metal circuit 220 on the insulating inner surface 214. The conductive adhesive 252 may be selectively used to prevent a problem where conventional high temperature soldering may damage the case 210. The protective adhesive 254 is deposited between the periphery of the key 230 and the insulating inner surface 214, to strengthen the adhesive strength between the key 230 and the insulating inner surface 214 to further increase the overall reliability. Of course, the protective adhesive 254 may be used between the microphone 240 and the insulating inner surface 214 to strengthen the adhesive strength.
The case 310 of the present embodiment further has two line input ports 316. Inside each line input ports 316 there is a blocking structure 316A and the part of the signal cable 54 passing through the line input port 316 is S shaped. By disposing the blocking structure 316A, a suitable fixing force may be provided to the signal cable 54 when the signal cable 54 is pulled and prevents the connecting relationship between the signal cable 54 and the metal circuit 320 from being damaged. In addition, the signal cable 54 and the metal circuit 320 on the insulating inner surface 312A may be adhesively bonded by the conductive adhesive 352. There are a plurality of configurations for the blocking structure 316A, and the configuration disclosed here is only an example. The signal cable 54 is S shaped refers to a bend in the signal cable 54 that will be produced due to the blocking structure 316A, however it is not to restrict the signal cable 54 to be the same as the shape of the letter S. In addition, the case 310 of the present embodiment further has an isolation wall 318, encircling a sound receiving hole 318A and a microphone 340. The isolation wall 318 assists in assuring the sound receiving effect of the microphone 340. In addition, the dimensional error produced is decreased by the omission of the use of a circuit board and the chamber above the microphone does not leak easily.
In summary, an audio device of the invention forms a metal circuit in the control unit and directly on the inner surface of the case, and the circuit board which is used to carry the circuit in conventional techniques is omitted. Therefore, the possibilities of where the final dimension may be affected by the dimensional error of the circuit board, the assembly error of the electronic components and the circuit board, and the assembly error of the circuit board and the case are decreased. In this way, it is easier to obtain a better sound receiving effect for a microphone and when setting the keys there is a better operational feel.
It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present invention without departing from the scope or spirit of the invention. In view of the foregoing, it is intended that the present invention cover modifications and variations of this invention provided they fall within the scope of the following claims and their equivalents.
Number | Date | Country | Kind |
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103145224 | Dec 2014 | TW | national |