Smart Cover received great attention following the birth of iPad 2. Jobs said that "iPad 2 and Smart Cover will work seamlessly like a device". How does this new protective case work? What is the technical principle? Let me lead you to unveil it.

Smart Cover's magnet is very ingenious. Magnets are mainly concentrated on one side. Through a magnetic observation film, you can clearly see the distribution of magnets on the Smart Cover and iPad 2.

There is a magnet on the Smart Cover to enable the iPad 2 to enter the sleep mode. The remaining magnets are either used to fix the iPad 2 when making a protective case, or used to absorb and fix the triangular support. However, you don't need to spend 298 yuan to buy Smart Cover to put it into sleep mode. It is enough to put a small magnet close to the sensing position.

There is also a small row of magnets on the left side of the Smart Cover and iPad 2 to fix the protective case and the body. Why are these magnets a combination of long and short?

The right side of the machine looks like this after the iPad 2 is completely disassembled:

The original in the red box is a sleep sensor. After touching the round magnet of Smart Cover, the screen display will be turned off. In the yellow box is a row of magnets used to fix the protective shell and the body, and the magnetic poles are respectively "positive and negative". The magnets on the iPad are opposite to the corresponding magnetic poles on the Smart Cover to ensure that the protective case is fixed in the correct direction. A row of magnets on the left side of the iPad 2 are embedded in the aluminum alloy housing:

These magnets cover almost the whole frame of the fuselage, making it more closely attached to the magnets on the protective shell. IFixit said that the magnetic force of these magnets is very strong, and they will quickly attract together when placed at a distance.

Smart Cover can only be disassembled by force, and the beautiful shell can be cut to see the internal structure. The two ends of the protective shell are two long metal plates, on which magnets (red box and yellow box) are fixed and then wrapped with plastic. In the middle are two yellow plastic sheets, which are mainly used as support for the support.

Why are 14 magnets used on Smart Cover? When the magnet at this part is folded into a bracket, the metal part, not the magnet, needs to be adsorbed, so the magnet used is not strong enough to prevent the protective case from falling off if it is used in a small area.

There are a total of six magnets on the left, long, short and long (the molar code is DU). Their magnetism is very strong. The shape and magnetism of these two groups of magnets are specially designed so that each end can only attract the designated part, so it is impossible to place the protective case on the iPad 2 upside down or a few centimeters away.

The internal components of Smart Cover are not magical, but the careful design has improved its function and practicability. This protective case is more practical and beautiful than the original official protective case for iPad. Its combination with iPad 2 is also as seamless as claimed. I have bought iPad 2, so let's add another protective case. I have to admit that smart cover is really a work of genius.