| 摘要 |
<p>A removable device cover for an electronic device comprises a masked common ground electrical contact system to identify the cover to the device. The device cover can be swapped with other device covers, each device cover providing different, pre-defined features or functions; the device itself determines the appropriate features or functions using identifying information provided by the masked common ground electrical contact system. A masked, common ground electrical contact system (found for example on 35mm film cassettes to label the speed of the film) is extremely cheap to mass produce and is very robust and reliable.</p> |
