Claims
- 1. An inkjet head for jetting ink from nozzles, comprising:pressure chambers communicating with said nozzles; energy generating sections for imparting ink jet energy to said pressure chambers; and supply passages for supplying ink from an ink chamber to said pressure chambers, wherein each of said supply passages comprises: an independent damper; a first ink supply passage connecting said independent damper with said pressure chamber; and a second ink supply passage connecting said independent damper with said ink chamber, wherein said independent damper has an acoustic capacitance approximately equal to that of the meniscus of said nozzle.
- 2. The inkjet head according to claim 1, wherein the acoustic capacitance ‘Cd’ of said independent damper is set within a range of 1 to 2 times the minimum value ‘Cn’ of the acoustic capacitance of said meniscus.
- 3. The inkjet head according to claim 1, wherein said nozzles are constituted in such a manner that the scale of change in the acoustic capacitance of the meniscus of said nozzle is less than a factor of 2.
- 4. The inkjet head according to claim 1, wherein the sectional area of said first ink supply passage is smaller than the sectional area of said pressure chamber and said independent damper; andthe sectional area of said second ink supply passage is smaller than the sectional area of said ink chamber and said independent damper.
- 5. The inkjet head according to claim 1, wherein said energy generating section comprises a piezoelectric element.
- 6. An inkjet head for jetting ink from nozzles, comprising:pressure chambers communicating with said nozzles; energy generating sections for imparting ink let energy to said pressure chambers; and supply passages for supplying ink from an ink chamber to said pressure chambers, wherein each of said supply passages comprises: an independent damper; a first ink supply passage connecting said independent damper with said pressure chamber; and a second ink supply passage connecting said independent damper with said ink chamber, wherein said independent damper has a structure wherein the ink chamber is covered by an elastic member.
- 7. The inkjet head according to claim 6, wherein the sectional area of said first ink supply passage is smaller than the sectional area of said pressure chamber and said independent damper; andthe sectional area of said second ink supply passage is smaller than the sectional area of said ink chamber and said independent damper.
- 8. The inkjet head according to claim 6, wherein said energy generating section comprises a piezoelectric element.
Parent Case Info
This application is a continuation of international application PCT/JP00/02141, filed on Mar. 31, 2000.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
4443807 |
Koto |
Apr 1984 |
A |
4774529 |
Paranjpe et al. |
Sep 1988 |
A |
5943079 |
Yoshida |
Aug 1999 |
A |
Foreign Referenced Citations (7)
Number |
Date |
Country |
57-91275 |
Jun 1982 |
JP |
60-8074 |
Jan 1985 |
JP |
63-17056 |
Jan 1988 |
JP |
63-280650 |
Nov 1988 |
JP |
3-202352 |
Sep 1991 |
JP |
8-132639 |
May 1996 |
JP |
9-141856 |
Jun 1997 |
JP |
Continuations (1)
|
Number |
Date |
Country |
Parent |
PCT/JP00/02141 |
Mar 2000 |
US |
Child |
10/259755 |
|
US |