Right now, you're likely unlocking your phone with a passcode or using your fingerprint; but Apple wants to take things to the next level. Face ID works by first registering your face as you do rather funny-looking head rolls in front of the camera, then storing this information. After this set-up, to use the feature, you need only look down at your phone, and it unlocks — indicated by the little padlock that opens up on the screen. Then, swipe up, and you're in.
In the video posted by Mashable, two pairs of identical twin bothers put the iPhone X's Face ID to good use. One brother took a turn letting it scan his face, before passing it off to his twin — who then tried to use his own face to unlock the phone.
To spice things up a little more, one brother even removed his glasses before trying to "break into" his brother's device. Watch below to find out. Fail. The iPhone knows a lot of things. It knows your fingerprint. It knows your friends and family. But if you have a look-alike relative, it might not be able to tell you apart. Alex Cranz with Gizmodo tested out Face ID and confirmed what a lot of us have probably already suspected: most of the time, Face ID works perfectly.
In fact, as long as you don't give it a profile view (which it can't read), Face ID usually works in less than a second. You simply tilt it toward your face and swipe. It even works in the pitch black. Best yet, the technology gets smarter as you use it. In other words, over time, it will know it's you even if you've grown a beard, are wearing your glasses (including sunglasses!), are making a funny face, and even after you've removed or put on make-up. Joanna Stern of the Wall Street Journal also tried to trip up the iPhone X, similar to Mashable. Bottom line: you can expect Face ID to be easy to use, fast, and secure. And unless you have a twin named Dr. Evil, you probably don't need to worry.
Internally, the transformer is extensively insulated, as will be shown below. The second component type is the optocouplers, which send the feedback signal from the secondary to the primary. Internally, the optocoupler contains a LED and a photo-transistor, so the two sides are connected only by light, not by an electrical circuit.
] that lets EMI (electromagnetic interference) escape between the high-voltage primary and the low-voltage secondary. The above picture shows some of the isolation techniques. The secondary board (left) has the blue Y capacitor. Note the lack of components in the middle of the secondary board, forming an isolation boundary. The components on the right of the secondary board are connected to the primary board by the gray ribbon cable so they are at potentially high voltages.
The other connection between the boards is the pair of wires from the flyback transformer (yellow) delivering the output power to the secondary board; these were cut to separate the boards. ] Click for a larger version. Looking at these pictures, it's easy to lose track of how very small these components are, and how the charger crams all this complexity into one inch.
The following slightly magnified picture shows a quarter, a grain of rice, and a mustard seed to give a size comparison. Most of the components are surface-mount devices which are soldered directly to the printed circuit board. The smallest components, such as the resistor pointed out in the picture, are known as "0402" size since they are .04 inches by .02 inches. The larger resistors to the left of the mustard seed handle more power and are known as "0805" size since they are .08 x .05 inches. ] But what's inside,
I took apart the transformer to find out. Apple Recalls iPhone 3G Power Adapters in Wired provides more details. ] Low-quality chargers interfere with touchscreens, and this is described in detail in Noise Wars: Projected capacitance strikes back. ] There are many industry designs for USB AC/DC converters in the 5W range.
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