Printhead for continuous ink jet printer

摘要

PCT No. PCT/GB90/02040 Sec. 371 Date Jul. 2, 1992 Sec. 102(e) Date Jul. 2, 1992 PCT Filed Dec. 21, 1990 PCT Pub. No. WO91/11327 PCT Pub. Date Aug. 8, 1991.A printhead (1) for a continuous ink jet printer has a single pair of nozzles (3,3'). One or more oscillators for vibrating the ink (3,3') may be used to break up the twin streams (4,4') of droplets issuing from the nozzles. A pair (5) of charging gates is provided for applying, selectively and respectively, a charge to droplets in the two streams (4,4'). A pair of deflector means (7) apply respective electric fields across the streams (4,4') to deflect the droplets individually in accordance with the charge thereon. A gutter (10) or pair of gutters (11,11') receive droplets from the respective streams if they are not charged. The arrangement is such that the two streams of droplets are deflected in opposite directions so as to be printed.