公开(公告)号：DE2552952A1

公开(公告)日：1976-07-01

申请号：DE2552952

申请日：1975-11-26

Applicant: IBM

Inventor： HELINSKI EDWARD FRANK ,  LEE MO CHONG ,  ZABLE JACK LOUIS

IPC: B41J2/075 ,  B41J2/12 ,  G06K15/10 ,  H04N1/034 ,  B41J3/04

Abstract: A continuous jet stream of a ferrofluid ink is broken into individual drops by an asymmetrical perturbation force applied to the stream. The ink, as it exits from an orifice under pressure, is excited by an electromagnetic transducer energized with an asymmetrical excitation signal having a fundamental and higher harmonics. An asymmetrical excitation signal, such as a sawtooth, having a substantial second and/or third harmonics content which produce an excitation signal with different rise and fall times can form a stream of drops free of satellites. Asymmetry of magnetic field forces can be produced with single stage or multi-stage transducers located at spaced positions along the stream. Asymmetry can also be produced using an electromagnetic transducer having a non-uniform gap.