Mechanical Design Review OF MI 2nd generation bluetooth audio real product

Yesterday we checked the out surface of MI 2nd generation bluetooth audio, and learn a little bit manufacturing knowledge from defects on aesthetic surface. Today we are going to disassemble the device, and analysis its mechanical design.


First open the shell, because it’s all fixed by buckles. It is relatively difficult to separate. After opening, it was found that the horn diaphragm was very dirty. Since it was not designed to be used as a dust-proof net, dirty objects flew through the holes.


Looking at the small fixed parts above the shell, the MIC is glued to fix, and the signal light lens is a translucent lens with a diffusing agent, which is directly stuck in the shell, and then a piece of shading foam is attached. In general, it is cheap design, but it is very practical.


There are a lot of positioning holes on the top of the shell, and there are also screw posts. Not sure if these designs are for locking screws or preventing  the step difference. From the perspective of the finished product, it is a bit redundant. In fact, it is enough to limit position by the columns.


Next, remove the screws on the horn to separate the cavity inside the horn, and the rear case will be separated together.

The rear sound chamber of the speaker box is designed with a ring of sealing ring. The sealing ring is sealed with a little white silicone, and lock with screw. Then the cavity of the whole product is completed. It is very simple. There is no reverse hole design like other professional audio.

There are three speakers.It is judged to be composed of two tweeters and one mid-range speaker in the middle.  It’s not our specialty, so not 100% sure about this.

Therefore, there is no cavity structure designed to be reviewed, and the hardware is used to adjust and complete the sound quality.


Looking at the structure of the back shell, it is very simple, except for the screw column, and there is no buckle with other structures.


Then look at the structure of the button is fixed, the button is formed by die casting, and then fixed together by means of silicone double-sided adhesive. The design of the structure is also very simple.


Next  look at a detail about the gate position of top case. It is a banana gate designed on the buckle. when the plastic resin goes to the corner, the appearance will see some gas lines.  This kind of gate will be better than the direct gate shot on the larger surface which will be more obvious gas marks. so it is also important to choose the location of gate. Of course, this is not the best choice. It needs to be simulated in the early stage to perfect it.

At last, full disassembly picture show:

 

[Conclusion]

1, the PCB is fixed directly using the way of locking screws, there is nothing special, so there is no detailed explanation.

 

2, aluminum alloy frame is made of aluminum profile + cutting + CNC process, and there is no special structure.


3, the overall assembly sequence is: first insert the bottom shell into the aluminum alloy frame, and then put the speaker box from the top shell, thus forming the structure of the sandwich biscuits. Finally lock the screws to fix them, and  cover above the shell.

This kind of structure is very simple, and easy for mass production. The only shortage is the matching gap between the plastic and the middle frame, which is difficult to control,because there is no good limit space, and the frame is also easily deformed. Unless the structure of the profile is changed.


4, the sound quality is just so so.  


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