Patent ID: 6070962
Filing Date: 2000-06-06
Classification: B41J

Abstract:
A portable dot printing device for printing dot images on a recording medium, the portable dot printing device comprising:a movement amount detection means for detecting movement amount of the portable dot printing device across the recording medium and for producing a pulse signal based on a fixed predetermined detectable movement amount, said fixed predetermined detectable movement amount being the smallest movement amount detectable by the movement amount detection means as the movement amount detection means moves across the recording medium;a print head formed with at least a first element row and a second element row each having elements for printing dots on the recording medium, the first element row and the second element row being separated by a fixed predetermined distance equal to a distance obtained by multiplying the fixed predetermined detectable movement amount and a single predetermined fixed integer, the print head being controlled to print images using the elements based on the pulse signal from the movement amount detection means; anda control device that controls the print head so that the elements in both the first and second element rows print dots simultaneously and that, in synchronization with the pulse signal from the movement amount detection means, controls the elements of the first and second element rows to print dots;wherein as the portable dot printing device is moved across the recording medium, the movement amount detection means produces the pulse signal synchronously with the portable dot printing device being moved a distance equal to the fixed predetermined detectable movement amount.