The newly granted patent, entitled "particle control for head mounted devices", discusses how the device can remove dust or other debris from the "optical module" by itself. Apple It is indicated in the patent that the view quality provided by the optical module can depend on the clarity of the optical path between the image source and the user's eyes. Particles along the optical path (such as dust, debris, foreign matter and / or other materials) can block, distort and / or otherwise adversely affect the view provided to the user.
Especially when the display element includes a high-resolution display screen, such particles on the surface of the display element can block the whole pixel and / or multiple pixels, so that the image transmitted to the user is changed from its expected form. According to apple, this problem will only increase during the life of the headset, even if the device is sealed to prevent and limit the entry of particles from the external environment.
Over time, degradation, erosion, friction, wear and / or aging of components may mean that particles will migrate or accumulate on the display element. Apple's suggestion is that the device itself is committed to removing dust and capturing particles so that they do not interfere with the user's line of sight or through optical components. One way to achieve this is through vibration. Details in the patent application show different ways to move lenses or other optical devices to remove debris. Apple suggests that the optical module can include a particle retention element that can firmly retain the particles and keep them outside the optical path.