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Moving Coil Ink Jet Print Head

IP.com Disclosure Number: IPCOM000080215D
Original Publication Date: 1973-Nov-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Battison, AH: AUTHOR [+3]

Abstract

A multinozzle ink jet print head is shown in Fig. 1, comprising a plate 10 having a recess 12 with a plurality of tapered orifices 14 through which ink 16 may be forced by a flexible diaphragm 18 enclosing the recess. Ink is supplied to the recess by inlet 20. A rigid cone 22 attached to the flexible diaphragm is actuated by coils 24 secured to a tubular extension 26 and which may be pulsed to more in the magnetic field of magnet 28 as shown schematically. After the pulse is removed, the transducer will return to its neutral position due to the energy stored in the deflected diaphragm and, if used, positioning springs. If desired, coil polarity can be reversed to obtain faster return.

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Moving Coil Ink Jet Print Head

A multinozzle ink jet print head is shown in Fig. 1, comprising a plate 10 having a recess 12 with a plurality of tapered orifices 14 through which ink 16 may be forced by a flexible diaphragm 18 enclosing the recess. Ink is supplied to the recess by inlet 20. A rigid cone 22 attached to the flexible diaphragm is actuated by coils 24 secured to a tubular extension 26 and which may be pulsed to more in the magnetic field of magnet 28 as shown schematically. After the pulse is removed, the transducer will return to its neutral position due to the energy stored in the deflected diaphragm and, if used, positioning springs. If desired, coil polarity can be reversed to obtain faster return.

A modification is shown in Fig. 2 wherein the plate 10 comprises a laminated structure with an inner layer 10A of TEFLON*, Polyethylene or other suitable material for inducing a restrictive contact angle to inhibit free flow of the ink and a thin outer layer 10B of glass, ceramic or other hard material.

A plurality of dots may be produced at one time; this is of advantage for printing a bar in a bar-code printer. Ink flows only during printing, and no deflection plates or charging plates are required. There is no need to compensate for document movement as all desired drops are produced at one time. The sandwiched design limits liquid creep yet provides a hard outer wear surface. Laminar flow provides clean neat droplets. * Trademark of E. I. du Pont d...