The outer layer of the dot projector is sealed with resin and protected by metal welding techniques.

Pay attention to these welding points. They can easily fall off once the phone is dropped. And once off, they cannot be restored.

Once the dot projector has been detached, we can see a crystal that looks just like a diamond lens.

The infrared light is emitted from here. Then reflected by the crystal. Its projection range is determined by the lens afterwards.