US5008689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic substrate for thermal ink jet printer
Assignee: HP Inc
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Filing: 1990-03-09
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Granted: 1991-04-16
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Expires: 2010-03-09
Abstract
Abstract A substrate for the print head of an ink jet printer includes a plastic base, a metallization layer overlying the plastic base, and a dielectric structure overlying the metallization layer. A thin film resistor is deposited over the substrate, as required. Preferred materials include polyimide plastic for the base, chromium for the metallization layer, and a bilayer construction of silicon dioxide overlying titanium for the dielectric structure.
Inventors
- 👤 Alfred I-Tsung Pan
- 👤 Eric G. Hanson
- 👤 Christopher A. Schantz
- 👤 Winthrop D. Childers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:59
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/135; B41J2/14; B41J2/14016; B41J2/14088; B41J2/14112; B41J2/14129; B41J2/16; B41J2/1601; B41J2/1603; B41J2/1621; B41J2/1623; B41J2/164; B41J2/1642; B41J2/1643; B41J2/1646; B41J2202/00; B41J2202/01; B41J2202/03; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/05; H05K1/053
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
102 words
A thermal ink jet printer print head, comprising: a plastic base; a metallization layer overlying the plastic base, the metallization layer having a thickness of from about 50 Angstroms to about 1000 Angstroms; a dielectric structure overlying the metallization layer, the dielectric structure including a metallic buffer layer overlying the metallization layer, the buffer layer having a thickness of greater than about 700 Angstroms, and a layer of a dielectric material overlying the metallic buffer layer; a resistor overlying the dielectric structure; and an orifice plate with an orifice therein and an ink channel overlying the thin film resistor and dielectric structure.
Claim 2
Dependent Claim
102 words
A thermal ink jet printer print head, comprising: a plastic base; a metallization layer overlying the plastic base, the metallization layer having a thickness of from about 50 Angstroms to about 1000 Angstroms; a dielectric structure overlying the metallization layer, the dielectric structure including a metallic buffer layer overlying the metallization layer, the buffer layer having a thickness of greater than about 700 Angstroms, and a layer of a dielectric material overlying the metallic buffer layer; a resistor overlying the dielectric structure; and an orifice plate with an orifice therein and an ink channel overlying the thin film resistor and dielectric structure.
Claim 3
Dependent Claim
16 words
The print head of claim 1, wherein the plastic base is made of a polyimide plastic.
Claim 4
Dependent Claim
12 words
The print head of claim 1, wherein the metallization layer is chromium.
Claim 5
Dependent Claim
19 words
The print head of claim 1, wherein the metallization layer is chromium with a thickness of about 400 Angstroms.
Claim 6
Dependent Claim
12 words
The print head of claim 1, wherein the buffer layer is titanium.
Claim 7
Dependent Claim
19 words
The print head of claim 1, wherein the buffer layer is titanium in a thickness of about 1500 Angstroms.
Claim 8
Dependent Claim
13 words
The print head of claim 1, wherein the dielectric layer is aluminum oxide.
Claim 9
Dependent Claim
13 words
The print head of claim 1, wherein the dielectric layer is silicon dioxide.
Claim 10
Dependent Claim
19 words
The print head of claim 1, wherein the dielectric layer is from about 0.1 to about 10 micrometers thick.
Claim 11
Dependent Claim
115 words
A thermal ink jet printer print head, comprising: a plastic base; a chromium layer overlying the plastic base, the chromium layer having a thickness of from about 50 Angstroms to about 1000 Angstroms; a dielectric structure overlying the chromium layer, the dielectric structure including a titanium layer overlying the chromium layer, the titanium layer having a thickness of from about 700 to about 3000 Angstroms, and a layer of a dielectric material overlying the titanium layer, the dielectric material having a thickness of from about 0.1 to about 10 micrometers and being selected from the group consisting of aluminum oxide and silicon dioxide; and means overlying the dielectric structure for ejecting a droplet of ink.
Claim 12
Dependent Claim
115 words
A thermal ink jet printer print head, comprising: a plastic base; a chromium layer overlying the plastic base, the chromium layer having a thickness of from about 50 Angstroms to about 1000 Angstroms; a dielectric structure overlying the chromium layer, the dielectric structure including a titanium layer overlying the chromium layer, the titanium layer having a thickness of from about 700 to about 3000 Angstroms, and a layer of a dielectric material overlying the titanium layer, the dielectric material having a thickness of from about 0.1 to about 10 micrometers and being selected from the group consisting of aluminum oxide and silicon dioxide; and means overlying the dielectric structure for ejecting a droplet of ink.
Claim 13
Dependent Claim
16 words
The print head of claim 10, wherein the plastic base is made of a polyimide plastic.
Claim 14
Dependent Claim
17 words
The print head of claim 10, wherein the thickness of the chromium layer is about 400 Angstroms.
Claim 15
Dependent Claim
17 words
The print head of claim 10, wherein the thickness of the titanium layer is about 1500 Angstroms.
Claim 16
Dependent Claim
17 words
The print head of claim 10, wherein the thickness of the dielectric material is about 6000 Angstroms.
Claim 17
Dependent Claim
15 words
The print head of claim 10, wherein the means for ejecting includes an electrical resistor.
Claim 18
Dependent Claim
87 words
A thermal ink jet printer print head, comprising: a plastic base; a metallization layer overlying the plastic base, the metallization layer having a thickness of from about 50 Angstroms to about 1000 Angstroms; a dielectric structure overlying the metallization layer, the dielectric structure including a buffer layer overlying the metallization layer, the buffer layer having a thickness of greater than about 700 Angstroms, and a layer of a dielectric material overlying the metallic buffer layer; and means overlying the dielectric structure for ejecting a droplet of ink.
Claim 19
Dependent Claim
87 words
A thermal ink jet printer print head, comprising: a plastic base; a metallization layer overlying the plastic base, the metallization layer having a thickness of from about 50 Angstroms to about 1000 Angstroms; a dielectric structure overlying the metallization layer, the dielectric structure including a buffer layer overlying the metallization layer, the buffer layer having a thickness of greater than about 700 Angstroms, and a layer of a dielectric material overlying the metallic buffer layer; and means overlying the dielectric structure for ejecting a droplet of ink.
Claim 20
Dependent Claim
12 words
The print head of claim 16, wherein the metallization layer is chromium.
Claim 21
Dependent Claim
14 words
The print head of claim 16, wherein the buffer layer is made of titanium.
Claim 22
Dependent Claim
22 words
The print head of claim 16, wherein the dielectric material is selected from the group consisting of aluminum oxide and silicon dioxide.
References Cited (Backward Citations)
US4926197A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-04-15 | 1994-10-15 | 1995-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-15 | 1998-10-15 | 1999-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-15 | 2002-10-15 | 2003-04-16 | $7700.00 | Window Closed / Lapsed |