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PRECISELY ALIGNED FOUR-COLOR THERMAL DROP ON DEMAND INK JET PRINTHEAD

IP.com Disclosure Number: IPCOM000025801D
Original Publication Date: 1988-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 4 page(s) / 192K

Publishing Venue

Xerox Disclosure Journal

Abstract

Four-color, drop-on-demand thermal ink jet printing places a stringent requirement on relative alignment of the four separate printheads. As pixel resolution increases, this precision must increase. It is difficult to precisely align the printheads. Strategies of using separate, disposable printheads also demand a precision aligning fixture that an untrained user can use to precisely reposition replacement cartridges.

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XEROX DISCLOSURE JOURNAL

PRECISELY ALIGNED FOUR-COLOR Proposed Classification
THERMAL DROP ON DEMAND INK JET US. C1.156/626 PRINTHEAD Int, C1, HOll21/306
Donald J. Drake
William G. Hawkins

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Volume 13 Number 2 March/April 1988 61

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PRECISELY ALIGNED FOUR-COLOR THERMAL DROP ON DEMAND INK JET PRINTHEAD (Cont'd)

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  XEROX DISCLOSURE JOURNAL Volume 13 Number 2 March/April 1988

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PRECISELY ALIGNED FOUR-COLOR THERMAL DROP ON DEMAND INK JET PRINTHEAD (Cont'd)

Four-color, drop-on-demand thermal ink jet printing places a stringent requirement on relative alignment of the four separate printheads. As pixel resolution increases, this precision must increase. It is difficult to precisely align the printheads. Strategies of using separate, disposable printheads also demand a precision aligning fixture that an untrained user can use to precisely reposition replacement cartridges.

An alternate strategy is to fabricate a single four-color printhead. The primary advantage of this approach is that the manufacturer can ensure relative alignment of the four printheads at the factory.

A single four-color printhead 10 that utilizes present fabrication techniques is shown in Figure 1 in cross-sectional view. The printhead uses batch processing and simultaneous ali ing and bonding techniques disclosed in

relative alignment of all four printheads and makes a precision alignment fixture on the printer unnecessary. The printhead is very small and light, especially if off-carriage ink supplies are used.

The four-color thermal ink jet printer 10 has been dimensioned to make the structures suitable for drop-on-demand printing. The ink channels 12 are all 16 mils long and the fill holes 20,21,33,34 have been located to ensure that a flat heater area of at least 85 mils has been provided for an on-board driver matrix with electrical leads coming out of the side of the printhead instead of the back or opposite end from the nozzles 14.

individual parallel grooves 12 which connect at one end to the fill

8" a processing technique provides precise

Printhead 10 is composed of five anisotropically etched, 20 mils thick silicon plates, four of which have linear arrays of resistive heating elements or heaters 16. Silicon plate 18 has fill holes 20 and 21 and a lurality of

ooves will serve as capillary ink channels and their open ends as nozzles 14.

fY ilicon plate 24 has a recess 25 for an ink manifold; one end of the recess is etched through to form passageway 26. Grooves 12 intersect the recess 25 at a side opposite the passageway 26. On the surface of the silicon plate 24,
opposite the one with the recess 25, an array...