US4901092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ink jet recording head using a piezoelectric element having an asymmetrical electric field applied thereto
Assignee: Canon Inc
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Filing: 1988-09-30
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Granted: 1990-02-13
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Expires: 2008-09-30
Abstract
Abstract An ink jet recording head includes a piezoelectric element with an outer cross-sectional shape having opposed, curved first surfaces and opposed second surfaces, which may be formed by cutting off opposite sides of a circular cross-section piezoelectric element on diametrically opposed chords. An electric field applied to the piezoelectric element is stronger in one direction than another, thereby increasing the discharge efficiency of the ink jet head.
Inventors
- 👤 Jiro Moriyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:36
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/135; B41J2/14; B41J2/14201; B41J2/1429
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
110 words
An ink jet recording head including a piezoelectric element having an outer cross-sectional shape in a plane perpendicular to the direction in which ink is discharged therefrom, said shape comprising opposed, curved first surfaces and opposed second surfaces, and having an inner surface defining a hollow portion providing a path for guiding the ink to be discharged from the head, wherein: one of said first surfaces has an electrode disposed thereon, and said piezoelectric element is deformable by applying a voltage to said electrode to create in said plane an electric field stronger in one direction than in a direction different from said one direction to more efficiently discharge ink.
Claim 2
Dependent Claim
110 words
An ink jet recording head including a piezoelectric element having an outer cross-sectional shape in a plane perpendicular to the direction in which ink is discharged therefrom, said shape comprising opposed, curved first surfaces and opposed second surfaces, and having an inner surface defining a hollow portion providing a path for guiding the ink to be discharged from the head, wherein: one of said first surfaces has an electrode disposed thereon, and said piezoelectric element is deformable by applying a voltage to said electrode to create in said plane an electric field stronger in one direction than in a direction different from said one direction to more efficiently discharge ink.
Claim 3
Dependent Claim
31 words
An ink jet recording head according to claim 1, wherein another electrode is disposed on said inner surface and said piezoelectric element is deformable by applying a voltage between said electrodes.
Claim 4
Dependent Claim
32 words
An ink jet recording head according to claim 1, wherein another electrode is disposed on one of said second surfaces and piezoelectric element is deformable by applying a voltage between said electrodes.
Claim 5
Dependent Claim
32 words
An ink jet recording head according to any one of claims 1 and 3, comprising plural said piezoelectric elements disposed side by side with said second surfaces located adjacent to each other.
Claim 6
Dependent Claim
30 words
An ink jet recording head according to claim 1, wherein said shape of said piezoelectric element has a length in one direction different from the length in an orthogonal direction.
Claim 7
Dependent Claim
15 words
An ink jet recording head according to claim 5, wherein said electrode is film shaped.
Claim 8
Dependent Claim
15 words
An ink jet recording head according to claim 5, wherein said electrode is a plate.
Claim 9
Dependent Claim
18 words
An ink jet recording head according to claim 5, wherein said electrode is detachable from said piezoelectric element.
Claim 10
Dependent Claim
111 words
An ink jet recording head including a piezoelectric element having an outer cross-sectional shape in a plane perpendicular to the direction in which ink is discharged therefrom, said shape comprising opposed, curved first surfaces and opposed second surfaces, and having an inner surface defining a hollow portion providing a path for guiding the ink to be discharged from the head, wherein: one of said second surfaces has a first electrode disposed thereon, and said piezoelectric element is deformable by applying a voltage to said electrode to create in said plane an electric field stronger in one direction than in a direction different from said one direction to more efficiently discharge ink.
Claim 11
Dependent Claim
111 words
An ink jet recording head including a piezoelectric element having an outer cross-sectional shape in a plane perpendicular to the direction in which ink is discharged therefrom, said shape comprising opposed, curved first surfaces and opposed second surfaces, and having an inner surface defining a hollow portion providing a path for guiding the ink to be discharged from the head, wherein: one of said second surfaces has a first electrode disposed thereon, and said piezoelectric element is deformable by applying a voltage to said electrode to create in said plane an electric field stronger in one direction than in a direction different from said one direction to more efficiently discharge ink.
Claim 12
Dependent Claim
30 words
An ink jet recording head according to claim 9, wherein another electrode is disposed on said inner surface said piezoelectric element is deformable by applying a voltage between said electrodes.
Claim 13
Dependent Claim
20 words
An ink jet recording head according to claim 9, wherein another electrode is disposed on the other said second surface.
Claim 14
Dependent Claim
27 words
An ink jet recording head according to claim 9, comprising plural said piezoelectric elements disposed side by side with said second surfaces located adjacent to each other.
Claim 15
Dependent Claim
31 words
An ink jet recording head according to claim 9, wherein said outer shape of said piezoelectric element has a length in one direction different from the length in an orthogonal direction.
Claim 16
Dependent Claim
15 words
An ink jet recording head according to claim 13, wherein said electrode is film shaped.
Claim 17
Dependent Claim
15 words
An ink jet recording head according to claim 13, wherein said electrode is a plate.
Claim 18
Dependent Claim
18 words
An ink jet recording head according to claim 13, wherein said electrode is detachable from said piezoelectric element.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-12 | 1993-08-14 | 1994-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-12 | 1997-08-14 | 1998-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-12 | 2001-08-14 | 2002-02-13 | $7700.00 | Window Closed / Lapsed |