US4740800A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid jet recording head
Assignee: CANNON A CORP OF JAPAN KK
•
Filing: 1987-02-17
•
Granted: 1988-04-26
•
Expires: 2007-02-17
Abstract
Abstract There is disclosed a liquid jet recording head comprising: a plurality of discharge ports through which liquid is discharged; a plurality of electro-thermal converting elements, each provided correspondingly to each discharge port and generating thermal energy used for discharging said liquid, the electro-thermal converting elements having a heat resistive layer provided on a substrate and an electrically, conductive layer for forming at least one set of electrodes electrically connected to the heat resistive layer; and a dummy heater provided adjacent to a group of plural elements of the heat resistive layer.
Inventors
- 👤 Masayuki Kyoshima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:20
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/135; B41J2/16; B41J2/1621; B41J2/164; B41J2/1601; B41J2/1604; B41J2/1623; B41J2/1626; B41J2/1629; B41J2/1631; B41J2/1646
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
88 words
A liquid jet recording head comprising: a plurality of discharge ports through which liquid is discharged; a plurality of electro-thermal converting elements, each provided correspondingly to each discharge port and generating thermal energy used for discharging said liquid; said electro-thermal converting elements having a heat resistive layer provided on a substrate and an electrically conductive layer for forming at least one set of electrodes electrically connected to said heat resistive layer; and a dummy heater provided adjacent to a group of plural elements of said heat resistive layer.
Claim 2
Dependent Claim
88 words
A liquid jet recording head comprising: a plurality of discharge ports through which liquid is discharged; a plurality of electro-thermal converting elements, each provided correspondingly to each discharge port and generating thermal energy used for discharging said liquid; said electro-thermal converting elements having a heat resistive layer provided on a substrate and an electrically conductive layer for forming at least one set of electrodes electrically connected to said heat resistive layer; and a dummy heater provided adjacent to a group of plural elements of said heat resistive layer.
Claim 3
Dependent Claim
16 words
A recording head according to claim 1, wherein said dummy heater comprises said heat resistive layer.
Claim 4
Dependent Claim
38 words
A recording head according to claim 1, wherein said dummy heater is a layer having substantially the same etching rate as that of said heat resistive layer with which said electro-thermal converting element is formed in fabrication thereof.
Claim 5
Dependent Claim
20 words
A recording head according to claim 1, said dummy heater comprises said heat resistive layer and said electrically conductive layer.
Claim 6
Dependent Claim
49 words
A recording head according to claim 4, wherein said dummy heater has said heat resistive layer and said electrically conductive layer, and is a layer having a substantially higher etching rate than that of said heat resistive layer with which said electro-thermal converting element is formed in fabrication thereof.
Claim 7
Dependent Claim
31 words
A recording head according to claim 4, wherein said electrically conductive layer is formed so that a desired distance is provided between said electrically conductive layer and said heat resistive layer.
Claim 8
Dependent Claim
33 words
A recording head according to claim 5, wherein said electrically conductive layer is formed so that the desired distance is provided between said electrically conductive layer and said layer of said dummy heater.
Claim 9
Dependent Claim
14 words
A recording head according to claim 1, wherein said dummy heater has rectangular shape.
Claim 10
Dependent Claim
15 words
A recording head according to claim 1, wherein said dummy heater is a stripe shape.
Claim 11
Dependent Claim
16 words
A recording head according to claim 1, wherein said dummy heater is divided into small pieces.
Claim 12
Dependent Claim
13 words
A recording head according to claim 10, wherein said division is performed latticedly.
Claim 13
Dependent Claim
75 words
A substrate for a liquid jet recording head, comprising a plurality of electro-thermal converting elements provided on a support member, said element having a heat resistive layer provided on said support member and an electrically conductive layer for forming at least one set of electrode electrically connected to said heat resistive layer, and a dummy heater provided on said support member and adjacent to at least both sides of the row of said plural elements.
Claim 14
Dependent Claim
75 words
A substrate for a liquid jet recording head, comprising a plurality of electro-thermal converting elements provided on a support member, said element having a heat resistive layer provided on said support member and an electrically conductive layer for forming at least one set of electrode electrically connected to said heat resistive layer, and a dummy heater provided on said support member and adjacent to at least both sides of the row of said plural elements.
Claim 15
Dependent Claim
19 words
A substrate for a recording head according to claim 12, wherein said dummy heater comprises said heat resistive layer.
Claim 16
Dependent Claim
41 words
A substrate for a recording head according to claim 12, wherein said dummy heater is a layer having substantially the same etching rate as that of said heat resistive layer with which said electro-thermal converting element is formed in fabrication thereof.
Claim 17
Dependent Claim
23 words
A substrate for a recording head according to claim 12, said dummy heater comprises said heat resistive layer and said electrically conductive layer.
Claim 18
Dependent Claim
52 words
A substrate for a recording head according to claim 15, wherein said dummy heater has said heat resistive layer and said electrically conductive layer, and is a layer having a substantially higher etching rate than that of said heat resistive layer with which said electro-thermal converting elements is formed in fabrication thereof.
Claim 19
Dependent Claim
34 words
A substrate for a recording head according to claim 15, wherein said electrically conductive layer is formed so that a desired distance is provided between said electrically conductive layer and said heat resistive layer.
Claim 20
Dependent Claim
36 words
A substrate for a recording head according to claim 16, wherein said electrically conductive layer is formed so that the desired distance is provided between said electrically conductive layer and said layer of said dummy heater.
Claim 21
Dependent Claim
17 words
A substrate for a recording head according to claim 12, wherein said dummy heater has rectangular shape.
Claim 22
Dependent Claim
18 words
A substrate for a recording head according to claim 12, wherein said dummy heater is a stripe shape.
Claim 23
Dependent Claim
19 words
A substrate for a recording head according to claim 12, wherein said dummy heater is divided into small pieces.
Claim 24
Dependent Claim
16 words
A substrate for a recording head according to claim 21, wherein said division is performed latticedly.
Claim 25
Dependent Claim
93 words
A substrate for a liquid jet recording head formed by the following steps; forming a heat resistive layer for a plurality of electro-thermal converting elements in an area of a support member, said area including at least both sides of the row of said electro-thermal converting elements; and etching said formed heat resistive layer under the condition that dummy portion is provided in said both sides, so as to cause the etching rate of the resistive layer all over the area in which at least heat generating portion is provided to be constant.
Claim 26
Dependent Claim
93 words
A substrate for a liquid jet recording head formed by the following steps; forming a heat resistive layer for a plurality of electro-thermal converting elements in an area of a support member, said area including at least both sides of the row of said electro-thermal converting elements; and etching said formed heat resistive layer under the condition that dummy portion is provided in said both sides, so as to cause the etching rate of the resistive layer all over the area in which at least heat generating portion is provided to be constant.
References Cited (Backward Citations)
US4458256A
Cited
US4339762A
Cited
US4370668A
Cited
US4429321A
Cited
US4609427A
Cited
US4646110A
Cited
US4602261A
Cited
US4631555A
Cited
US4624740A
Cited
US4648938A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-26 | 1991-10-26 | 1992-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-26 | 1995-10-26 | 1996-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-26 | 1999-10-26 | 2000-04-26 | $7700.00 | Window Closed / Lapsed |