Browse Prior Art Database

Phase Detection of Ink Jet Droplets

IP.com Disclosure Number: IPCOM000079678D
Original Publication Date: 1973-Aug-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Fan, GJ: AUTHOR

Abstract

In an ink jet system where the deflector is of the same size as that of the drop spacing, it is important to have the arrival time of the droplet and the field of the deflector synchronized to avoid cross talk of the droplets. In this application, the field must be turned on at the precise moment when the droplet enters the field of the transducer.

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Phase Detection of Ink Jet Droplets

In an ink jet system where the deflector is of the same size as that of the drop spacing, it is important to have the arrival time of the droplet and the field of the deflector synchronized to avoid cross talk of the droplets. In this application, the field must be turned on at the precise moment when the droplet enters the field of the transducer.

The figure shows an optical fiber system 14 used as a detector.

A beam of light 10 provided by a light source such as light-emitting diode 12 can be used to illuminate the ink stream, and an optical fiber is placed in proximity of the ink stream. The fiber should have a small acceptance angle, such that a (say 4 mil) droplet would block a significant amount of the beam from the fiber. Hence the detector 16 gives out an electrical signal corresponding to the passing of the droplet. The detector can be connected to the deflector controls, thus the signal from the fiber can be used to trigger the deflection control circuitry 18.

The advantages of this drop detection means are that the detector is compact and can be mounted on the deflection per se, is low in cost and simple.

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