Patent US4935750A successfully refreshed from Google Patents.
US4935750A
Expired / Lapsed
US
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Sealing means for thermal ink jet printheads
Assignee: Xerox Corp
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Filing: 1989-08-31
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Granted: 1990-06-19
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Expires: 2009-08-31
Abstract
Abstract A thermal ink jet printhead having an ink inlet and a plurality of droplet emitting nozzles is disclosed in which a patterned gasket is provided around each inlet during mass printhead fabrication. A plurality of printheads are obtained by dicing two mated substrates mounted in a holding film frame. A confronting surface of one of the substrates contains a plurality of sets of heating elements and addressing electrodes. The confronting surface of the other substrate contains a plurality of sets of recesses which serve as ink flow directing channels in communication with the nozzles and a reservoir having inlets in the opposite surface of the other substrate. In one embodiment, a polymeric thick film layer is deposited and photo-patterned to provide each inlet with a gasket, the surface of which is coated with a reflowable and curable adhesive for adherence to an ink supply such as an ink cartridge. In another embodiment, a compliant material such as silicone is screen printed directly around the printhead inlets.
Inventors
- 👤 William G. Hawkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:03
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/135; B41J2/16; B41J2/1601; B41J2/1604; B41J2/1621; B41J2/1623; B41J2/1626; B41J2/1628; B41J2/1629; B41J2/1631; B41J2/1635
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
114 words
An improved thermal ink jet printhead of the type having a plurality of ink channels with each containing a multi-layered thermal transducer therein, an ink reservoir with ink inlet, and a plurality of ink droplet emitting nozzles, said channels being in communication with the recess, so that ink fills the channels and selective application of electrical pulses representing digitized data to the thermal transducers eject and propel ink droplets from the printhead to a recording medium, wherein the improvement comprises: a patterned gasket being provided to surround the ink reservoir inlet during printhead fabrication; and an adhesive being screened on the gasket and cured after the printhead is assembled to an ink supply means.
Claim 2
Dependent Claim
114 words
An improved thermal ink jet printhead of the type having a plurality of ink channels with each containing a multi-layered thermal transducer therein, an ink reservoir with ink inlet, and a plurality of ink droplet emitting nozzles, said channels being in communication with the recess, so that ink fills the channels and selective application of electrical pulses representing digitized data to the thermal transducers eject and propel ink droplets from the printhead to a recording medium, wherein the improvement comprises: a patterned gasket being provided to surround the ink reservoir inlet during printhead fabrication; and an adhesive being screened on the gasket and cured after the printhead is assembled to an ink supply means.
Claim 3
Dependent Claim
31 words
The printhead of claim 1, wherein said adhesive is a reflowable epoxy which is reflowed and cured after the printhead reservoir inlet is aligned and mated with said ink supply means.
Claim 4
Dependent Claim
18 words
The printhead of claim 2, wherein the patterned gasket is photolithographically defined from a layer of photo-patternable material.
Claim 5
Dependent Claim
16 words
The printhead of claim 2, wherein the patterned gasket is screen printed with a compliant material.
Claim 6
Independent Claim
198 words
A method of fabricating a thermal ink jet printhead with ink supply comprising the steps of: (a) fixedly mating a first substrate with a second substrate, the first substrate having a plurality of ink flow directing sets of recesses in one surface thereof, each set of recesses having a reservoir with an open bottom which serves as an inlet and a plurality of parallel channels which communicate at one end with the reservoir recess, the second substrate having on one surface thereof a plurality of sets of heating elements and addressing electrodes, said mating of substrates placing a resistor in each channel; (b) patterning a plurality of gaskets on the surface of the mated substrates which has the inlets in a manner such that each inlet is surrounded by a patterned gasket; (c) mounting the mated substrates with the thick film gaskets on a film frame suitable for holding said mated substrates during dicing thereof; (d) screening an adhesive on the gaskets; (e) dicing the mated substrates to produce a plurality of individual printheads; (f) removing the printheads from the film frame; and (g) aligning and adhering each inlet gasket of the printhead to an ink supply outlet.
Claim 7
Independent Claim
198 words
A method of fabricating a thermal ink jet printhead with ink supply comprising the steps of: (a) fixedly mating a first substrate with a second substrate, the first substrate having a plurality of ink flow directing sets of recesses in one surface thereof, each set of recesses having a reservoir with an open bottom which serves as an inlet and a plurality of parallel channels which communicate at one end with the reservoir recess, the second substrate having on one surface thereof a plurality of sets of heating elements and addressing electrodes, said mating of substrates placing a resistor in each channel; (b) patterning a plurality of gaskets on the surface of the mated substrates which has the inlets in a manner such that each inlet is surrounded by a patterned gasket; (c) mounting the mated substrates with the thick film gaskets on a film frame suitable for holding said mated substrates during dicing thereof; (d) screening an adhesive on the gaskets; (e) dicing the mated substrates to produce a plurality of individual printheads; (f) removing the printheads from the film frame; and (g) aligning and adhering each inlet gasket of the printhead to an ink supply outlet.
Claim 8
Dependent Claim
65 words
The method of claim 5, wherein step (b) comprises the steps of: (b.1) patterning a plurality of gaskets on the surface of the mated substrates which has the inlets in a manner such that each inlet is surrounded by a patterned gasket; (b.2) mounting the mated substrates with the thick film gaskets on a film frame suitable for holding said mated substrates during dicing thereof.
Claim 9
Dependent Claim
24 words
The method of claim 5, wherein step (b) comprises screen printing a thick film elastic material to produce the gaskets which surround each inlet.
References Cited (Backward Citations)
US32572A
Cited
US4068144A
Cited
US4153901A
Cited
US4245225A
Cited
US4463359A
Cited
US4354194A
Cited
US4577202A
Cited
US4567493A
Cited
US4564846A
Cited
US4598303A
Cited
US4571599A
Cited
USRE32572E
Cited
US4638337A
Cited
US4678529A
Cited
US4831390A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-18 | 1993-12-18 | 1994-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-18 | 1997-12-18 | 1998-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-18 | 2001-12-18 | 2002-06-19 | $7700.00 | Window Closed / Lapsed |