If it is a low-intensity laser beam, it has basically no impact on the human body. Just like the laser pointer used by teachers in class, there is no problem, but it is still not recommended that you look directly at the laser. . Even if it is low-intensity, care should be taken to protect fragile areas such as the eyes. There is also the fact that things like laser-printed trademarks no longer belong to the category of laser. This laser trademark is actually just using a laser to engrave some special texture symbols on it. It can be easily entered into the computer when you look directly at the book in the library. No harm to human body.