Original Publication Date: 1962-Dec-01
Included in the Prior Art Database: 2005-Mar-07
AbstractMirror return time is eliminated and image focus is maintained in scanning lines of printed indicia by mounting a plurality of mirrors on a rotatable support, angularly disposed relative to the line of print.
Mirror return time is eliminated and image focus is maintained in scanning lines of printed indicia by mounting a plurality of mirrors on a rotatable support, angularly disposed relative to the line of print.
In the left drawing document 3 is positioned over a slotted or transparent support to expose a line of print to illumination from source 4 (right drawing) and scanning mirrors 5 and 6 secured to flexible toothed belt 7. The belt is angularly disposed at an angle 0 relative to the document such as 60 degrees. This provides constant length optical paths from the document to mirror 5 and lens 8 at an image utilization device as the mirror moves from position A to position B. Belt 7 is rotated at a constant velocity by pulleys 9 and 10 to provide a uniform scan of the printed line.
After scanning a line, the document is advanced a line increment while the belt continues its constant rotation. Mirror return time is eliminated by mounting a plurality of mirrors such as 5 and 6 at equal intervals along the belt. The spacing between mirrors is sufficient to allow document advance at the completion of each line scan before starting a new scan.
The mirrors can be secured to belt 7 by rivets through the belt flanges and mirror bases. The mirrors are steadied during scanning by sliding magnetic bases 11 on guide rail magnets 12.