Apple's Process for Fighting Finger Oils on Touch Surfaces
The third patent application of the day relates to applying an oleophobic coating to the surface of a material. In particular, this is directed to using a direct liquid application in a Physical Vapor Deposition ("PVD") chamber to apply the coating to the material.
Apple states that as the user touches the surface of a device such as an iOS device, oils and other particles from the user's fingers could be deposited on the surface. This may adversely affect the appearance of the surface, especially if information is being displayed. One way to limit the amount of oils and particles deposited on the surface of portable devices is to apply an oleophobic treatment to the surface. However, this approach could be difficult to accomplish.
Apple states that to prevent the deposition of oils on an electronic device surface, an oleophobic ingredient could be bonded to the electronic device surface. The oleophobic ingredient could be provided as part of a raw liquid material in one or more concentrations. To avoid adverse reactions due to exposure to air, heat, or humidity, the raw liquid material can be placed in a bottle purged with an inert gas during the manufacturing process.
The bottle could be placed in a liquid supply system having a mechanism for controlling the amount of raw liquid material that passes through the liquid supply system. Upon reaching the vaporizing unit, the liquid could be vaporized and the oleophobic ingredient within the liquid can then be deposited on the electronic device component surface. As the liquid supply is drained from the bottle, additional inert gas is supplied in its place to further prevent contamination.