Electronic Method for Joining Scan in Segmented Scanning Printhead
Original Publication Date: 1988-Jan-01
Included in the Prior Art Database: 2005-Feb-15
A segmented printhead in an electrophotographic printer scans the right and left field separately. The following is an electronic method for matching the right hand field to the positional error in the left field on a line-by-line basis. This method uses a start of scan sensor for both the right and left fields and an end of scan sensor on the left hand field. Since these three events are separated in time, their detection can be made by a single optical detector with separate fiber optic leads. The sequence in time is: Start of scan left (SOSL), start of scan right (SOSR) and end of scan left (EOSL). From a practical standpoint the fibers are placed outside write field. Therefore, the printer waits a short time after receiving SOSL before it starts to print data. The same is true of the position of the EOSL and SOSR.