US Patent 7417656 Compact printer

A compact printer that includes a sensor system for monitoring the position and/or status of media is provided. The system includes a photo source extending along a line across all or a portion of the width of a media path. The photo source can comprise a number of sources, such as a number of focused LED sources. A single detector or receiver is disposed on a side of the media path opposite the source. The location of the single receiver with respect to the width of the media path can be adjusted by a user. Information related to the intensity of light received at the receiver is passed to a controller, which can use the information to generate a media out signal or to determine the location of an index mark.