Now the mobile phone has been gradually removed from the identity of a simple communication tool, gradually transformed into a multimedia and information terminal equipment, the future daily communication, entertainment, financial management and other activities can be carried out through the mobile phone. When you see each time a novel and has a high performance, bright appearance of the mobile phone appears, do you have such curiosity, such a mobile phone is in the end how to design and manufacture out of it?
So today we try to use a technical objective point of view, to briefly describe the structure of the mobile phone design department and the relationship between departments and departments, and finally to show you the mobile phone from the manufacture to the pre-launch various tests, so that we can further understand the mobile phone, more cherish your love machine, perhaps you will not easily replace it in the future!
First, the design process of mobile phone
With a simple explanation, the average mobile phone design company is required to have the most basic six departments: ID, MD, HW, SW, PM, Sourcing, QA.
1 ID (Industry Design)
Including the appearance of mobile phones, materials, feel, color matching, the realization of the main interface and color design.
For example, the translucency of the Motorola "Ming" flip, the arc-shaped appearance of the Nokia 7610, the sun orange of the Sony Ericsson W550 and so on. These special feelings and experiences to the user belong to the category of mobile phone industrial design. Whether a mobile phone can become a best-selling product, the industrial design of mobile phone appears particularly important!
2 MD(Mechanical Design)
The choice of the front, rear and camera lens position of the phone, the way to fix it, how to connect the battery and how thick and thin the phone is. If the phone is a slide cover, how to make the phone slide up, how to automatically reload the phone, how to plug and unplug the SIM card, these are the scope of the design of the phone structure. The cumbersome parts need MD staff are very familiar with the material and technology.
The Motorola V3 set off a boom in the handset market with a thickness of 13.9mm. The V3 handset was sold as ultra-thin because its choice of case material was critical, so the V3's case was made of technologically advanced aviation-grade aluminum alloy. It can be said that the choice of special case material contributed to the success of the V3.
In addition, some individual users in the use of some ultra-thin slider phone, the phone when answering the phone can always feel the front shell of the left and right shake, this is the phone structural design problems, because the phone's shell is too thin, when the phone speaker vibration is easy to make the phone's body resonate.
Hardware design circuit and antenna, and HW is to maintain regular communication with MD.
For example, MD requirements to be thin, so the circuit also needs to be thin to make it work. At the same time, HW will require MD to place antenna area is larger, and the distance from the battery should be far enough, HW will also require ID in the vicinity of the antenna does not place a metal fittings, it can be expected that the design of a mobile phone antenna design and manufacture of high cost 25% of the main components, it is the design requirements of the design of the design and external antenna design of the design of the main components are higher than the design of the design of the design of the design of the design of the phone.
Usually the structure designer (MD) and the industrial designer (ID) will have a debate, MD said ID are painters, draw something we can not do, and ID will say MD stupid, not according to their design, so the phone sold poorly. Therefore, a new mobile phone in the hands of the design, the various departments will be the ID department of the design of the creative review, a good sense of the end of a good ID line can also be a good customer experience, but also be a good idea of good, if the end of Xolla good, a good sense of good, but also be a good to achieve a good, but also be a good idea of the end of the end of the customer is a good, a good, a good sense of a good, but also to achieve a good, Xolla good sense of the idea of the customer is a good, and a good, a good, but also to achieve a good, but also be very good, if the end of the idea of the customer is a good, So a really good idea, not only to look good, can be achieved, but also easy to use.
Relatively speaking, SW is easier for everyone to understand, because of the popularity of computers, let us maximize exposure to a variety of software, mobile phone operation interface mode, we often see the realization of the cell phone nine-officer operation menu, which is the scope of SW design.
SW test management is not just looking for bugs, conformance testing, compatibility testing, and so on. In the current content-based information age, software is the ultimate behind-the-scenes pillar of the phone, hardware drivers are software to implement, software and hardware to achieve, and there will be less conflict between software and hardware than there is between Project Management and Project Management.
5 PM(Project Management)
Large-scale companies have very detailed PM (TPM), such as TPM (Technologly Of Project Management) that specializes in technology PM, and ordinary PM, only manage the progress of the project coordination work, PM this department usually exists in the design of their own, their own production, their own sales of mobile phones companies, AM (Account Manager) position on behalf of the company as a bridge between the overall requirements, we are not strange to the company, the overall image of the company.
6 Sourcing Resource Development Department
The staff of the Resource Development Department are constantly digging for new resources, such as new materials, new cell phone components, test equipment, etc. When the phones start trial production, they want to make sure that all the production materials needed for the production line are available.
Mobile phones are tested in small batches, not only in terms of software / hardware maturity, but also in terms of production processes and production testing techniques. Some phones fail at this stage and end in failure. So the newly designed phones do not appear on the market, and the investment in development funds and manpower goes down the drain, which is a huge loss.
7 QA(Quality Assurance)
QA department is responsible for the quality assurance of the whole process, monitoring whether the development process is in line with the scheduled process, ensuring the productivity of the project, there are a lot of newly designed mobile phones, because of the encounter with a certain factor can not be produced and give up.
Producing a mobile phone is not as simple as experimenting in a lab. Once it is produced it is thousands of units. It is by no means an easy task to ensure the high quality of each product.Producing a sample of a mobile phone and producing 100,000 handsets are quite different things.
For example: Chinese restaurants are out of samples, McDonald's products, so McDonald's can do a lot, and so far, Chinese restaurants have not yet achieved the size of McDonald's is a fact, so mobile phone design companies will set up a lot of processes to prevent the design of the development of mobile phones can not put into production situation.
Not only that, the success of a mobile phone market, can sell a full house, is still the need to have close contact with the public mobile phone users, and through user feedback and rapid improvement in order to be successful.
Second, the little-known mobile phone test project
1 Stress Test
If something goes wrong, the software needs to be rewritten. So sometimes there will be different versions of the software on the phone. In fact, the more versions of the phone there are, it will prove that the phone was sold before it went on sale without sufficient testing.
2 anti-fall test
The anti-fall test is conducted by a dedicated Pprt reliability lab, where a 0.5m micro-drop test is done 300 times per face (the phone has six faces), while a 2m drop test is done once per face and the simulator throws the phone onto the table, while the battery used in the phone has to pass a minimum height of 4m, dropping 100 times toward the ground without breaking.
3 High / low temperature test
Let the phone in a different temperature environment to test the adaptability of the phone, the low temperature is generally 20 degrees below zero, high temperature is about 80 degrees Celsius.
4 High humidity test
A drip test using a special cabinet simulates human sweating (the penetration of a certain percentage of salt into the water), which takes about 30 hours.
5, Baige test (also known as the world tofu test)
Use H4 hardness of the pencil in the phone shell to draw 100 lattice, see if the phone shell will drop paint, some more stringent requirements of the phone, the phone shell will be re-coated with some of the "brand" of cosmetics, to see if because of different chemical composition and the phone's paint odor or drop the possibility of paint.
6 Flip reliability test
To flip the phone 100,000 times, check the loss of mobile phone shell, is to use a flip of the simulation machine, it can set the flip strength, angle and so on.
7 Torque test
The straight fixture holds both ends, one to the left and one to the right. Torque testing mainly tests the strength of the phone case and the large device on the inside of the phone.
8 Electrostatic test
In the north, the weather is drier, the metal touch easily produce static electricity, will lead to break through the circuit of mobile phones, some poorly designed mobile phones is such a sudden damage. The tool used for this test is a copper plate known as an "electrostatic gun", which is tuned to a high and low current of 10-15KV and tests all the metal contact points of the phone for discharge in a time of about 300ms-2s, in a humidity controlled room, while the charger (fire cow) will also be tested and released from the factory.]
9 Key life test
With the help of the machine to set the force to hit the keyboard 100,000 times, if the user every 100 times, that is 1000 days, equivalent to the user to use the phone about three years.
10 Dust test
After about three hours, turn on the phone and see if there is sand inside the handset. If there is, then the airtight design of the handset is not good enough and the structural design of the handset has to be readjusted.
In addition, the mobile phone test also contains more and more bizarre test items, such as the mobile phone on the iron plate to call to test, because the magnetic field has changed at this time, what will happen, such as SIM card can not be found, and so on.
Use wire in the bottom of the phone connector dialing to and from, mainly to take into account the handbag has a key in the case, whether the phone will short-circuit the problem.
There is also a deliberate charger / battery backconnect test to see if the protection circuit design of the phone is working properly, a test for calls close to the fluorescent lamp, a test for the proportion of electromagnetic waves absorbed by the human body, and a test for calls close to the heart pacemaker, to name but a few of the tests mentioned above.
The above test is basically the major well-known mobile phone manufacturers will strictly enforce, because they sell not only the phone itself, but more importantly they are selling service and credibility, who do not want to build up their own hard-hit signs bar!
Written at the end
Editor in many forums have seen countless articles on the topic of "who is the king of mobile phone" argument, opinions, praise and criticism, and even abuse. Editor has talked with a mobile phone designer as a mobile phone manufacturing practitioners, whenever heard to the user's various complaints about the mobile phone, he only gently replied: Because of this, so in the initial stage of mobile phone design and there will be no perfect way to consider.
So the editor of the "who is the king of mobile phone" is the view that "there is no best phone, only better phone." This is the editor of the mobile phone design and performance has always been high and low point of view, is the mobile phone manufacturers to pursue the goal, but also the expectations of our mass mobile phone users!
Design Principle of TD-SCDMA Mobile Phone
TD-SCDMA mobile phone design, a large part of the universal module.
TD-SCDMA mobile phone principle scheme diagram
The hardware platform structure of TD-SCDMA mobile phone mainly consists of RF receiving / sending module, analog baseband (LCR ABB), digital baseband (LCR DBB), application processor, power management module (PMU) and peripheral interface circuit.
TD-SCDMA handset hardware internal party