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Magnetic Moment Control for Use with a Magnetic Ink Control System

IP.com Disclosure Number: IPCOM000084594D
Original Publication Date: 1975-Dec-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Eller, CP: AUTHOR [+4]

Abstract

In magnetic ink jet printing, drop deflection is directly proportional to the magnetic moment of the ink. Therefore, to achieve good print quality it is desirable that the magnetic moment of the ink be maintained with small tolerances. The magnetic moment of the magnetic ink may be determined by a pair of identical transducer coils, one having magnetic ink flowing through it with the other containing air, connected in a bridge network.

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Magnetic Moment Control for Use with a Magnetic Ink Control System

In magnetic ink jet printing, drop deflection is directly proportional to the magnetic moment of the ink. Therefore, to achieve good print quality it is desirable that the magnetic moment of the ink be maintained with small tolerances. The magnetic moment of the magnetic ink may be determined by a pair of identical transducer coils, one having magnetic ink flowing through it with the other containing air, connected in a bridge network.

The transducer coil 10 of Fig. 1 comprises a primary winding 11 concentrically wound on secondary winding 12 wound on a plastic bobbin 13 having a conduit 14 connected between an ink reservoir and the nozzle of an ink jet printer. The second transducer coil is identical to coil 10 (same number of turns and same wire size) except ink does not flow through conduit 14. .

As seen in Fig. 2, the primary winding 11 is connected in series with the identical primary winding 15 of an identical transducer coil which does not have ink flowing through it. The two primary windings 11 and 15 are connected via variable resistor 16 to a high-frequency signal source 17. The secondary winding 12 of transducer coil 10 is also placed in series with the identical secondary winding 18 of the second transducer coil. However, the secondary windings 12 and 18 are connected to be bucking so that the output EMF (E(out)) at terminals 19 and 20 is: E(out) = N(s) omega mu(o) rho sigma A(ink) whe...