Recording head unit
First Claim
Patent Images
1. A recording unit comprising:
- a cartridge holder adapted to replaceably mount at least one ink cartridge defining a plurality of ink chambers;
a recording head, for ejecting ink in response to activation of a pressure generating element;
a plurality of ink flow paths through which ink in the ink chambers is supplied to the recording head, respectively, each of the ink flow paths including a first communication path communicated with an ink outlet of the corresponding ink chamber, a second communication path communicated with a corresponding ink inlet of the recording head, and a convergent flow path communicating the first communication path with the second communication path, convergent flow paths being arranged to converge toward the recording head; and
a filter respectively disposed in each of second communication paths;
wherein the filter is disposed in only an opening portion of the second communication path connected with an end of the convergent flow path.
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Accused Products
Abstract
Ink flow paths are formed that corresponds in number to the ink chambers of a mounted ink cartridge, to supply ink from the ink chambers to a recording head. These ink flow paths are constituted by first communication paths (59, 60), which communicate with the ink outlets of corresponding ink chambers, second communication paths (61, 67), which communicate with the corresponding ink inlets of the recording head, and convergent flow paths (65), which connect the first and the second communication paths and converge as they approach the recording head. Filters (56) are located in the second communication paths.
65 Citations
50 Claims
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1. A recording unit comprising:
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a cartridge holder adapted to replaceably mount at least one ink cartridge defining a plurality of ink chambers;
a recording head, for ejecting ink in response to activation of a pressure generating element;
a plurality of ink flow paths through which ink in the ink chambers is supplied to the recording head, respectively, each of the ink flow paths including a first communication path communicated with an ink outlet of the corresponding ink chamber, a second communication path communicated with a corresponding ink inlet of the recording head, and a convergent flow path communicating the first communication path with the second communication path, convergent flow paths being arranged to converge toward the recording head; and
a filter respectively disposed in each of second communication paths;
wherein the filter is disposed in only an opening portion of the second communication path connected with an end of the convergent flow path. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
nozzle openings, through which ink droplets are to be ejected; and
pressure generation chambers communicated with the nozzle openings, wherein ink pressure in a desired one of the pressure generation chambers is changed by the pressure to eject the ink droplets through the corresponding nozzle opening, and wherein piezoelectric vibrators, which can vary the volumes of the respective pressure generation chambers, are employed as the pressure generating element.
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31. A recording head unit according to claim 30, wherein the piezoelectric vibrators are piezoelectric vibrators of a vertical vibration mode.
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32. A recording head unit according to claims 1, further comprising:
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nozzle openings, through which ink droplets are ejected; and
pressure generation chambers communicated with the nozzle openings, wherein ink pressure in a desired one of the pressure generation chambers is changed by the pressure generating element to eject the ink droplets through the corresponding nozzle opening, and wherein heat generation devices that can generate air bubbles in the respective pressure generation chambers are employed as the pressure generating element.
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33. A recording head unit according to claim 1, wherein the filter is disposed so as to be continuous and flush with a bottom face of the second communication path.
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34. A recording head unit according to claim 1, wherein the first communication path and the second communication path are arranged so as to shift each other in a direction in which the convergent flow path extends;
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wherein the filter is not disposed in the first communication path, and wherein the filter is disposed in only the second communication path.
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35. A recording head unit according to claim 1, wherein the filter is disposed in the second communication path, and
wherein a portion of the second communication path, upstream of the filter is increased in a diameter as the portion toward the filter. -
36. A recording head unit according to claim 1, wherein the filter is not overlapped with the first communication path as viewed in a direction in which the first communication path extends.
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37. A recording head unit according to claim 1, wherein the first communication path and the second communication path are arranged so as to shift each other in a direction in which the convergent flow path extends.
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38. A recording head unit according to claim 1, wherein the convergent flow path is extended in a horizontal direction.
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39. A recording head unit according to claim 1, wherein the first communication path and the second communication path are extended in a substantially same direction.
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40. A recording head unit comprising:
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a cartridge holder adapted to replaceably mount at least one ink cartridge defining a plurality of ink chambers;
a recording head for ejecting ink in response to activation of a pressure generating element;
a plurality of ink flow paths through which ink in the ink chambers is supplied to the recording head, respectively, each of the ink flow paths including a first communication path communicated with an ink outlet of the corresponding ink chamber, a second communication path communicated with a corresponding ink inlet of the recording head, and a convergent flow path communicating the first communication path with the second communication path, convergent flow paths being arranged to converge toward the recording head; and
a filter respectively disposed in each of second communication paths, wherein the filter is disposed on a position in the second communication path lower than a bottom of the convergent flow path extended in a substantially horizontal direction. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47, 48, 49, 50)
wherein a second opening portion is provided between the convergent flow path and the second communication path; and
wherein the filter is disposed downstream of the second opening portion.
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42. A recording head unit according to claim 40, wherein the filter is disposed so as to be continuous and flush with a bottom face of the second communication path.
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43. A recording head unit according to claim 40, wherein the first communication path and the second communication path are arranged so as to shift each other in a direction in which the convergent flow path extends;
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wherein the filter is not disposed in the first communication path; and
wherein the filter is disposed in only the second communication path.
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44. A recording head unit according claim 40, wherein the filter is disposed in only an opening portion of the second communication path connected with an end of the convergent flow path.
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45. A recording head unit according to claim 40, wherein the filter is disposed in the second communication path;
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wherein a portion of the second communication path, upstream of the filter, is increased in a diameter as the portion toward the filter.
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46. A recording head unit according to claim 40, wherein the filter is not overlapped with the first communication path as viewed in a direction in which the first communication path extends.
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47. A recording head unit according to claim 40, wherein the convergent path extends from the first opening portion and terminates at the second opening portion.
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48. A recording head unit according to claim 40, wherein the first opening portion is offset for the second opening portion in a direction in which the convergent flow path extends.
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49. A recording head unit according to claim 40, wherein the first communication path and the second communication path are arranged so as to shift each other in a direction in which the convergent flow path extends.
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50. A recording head unit according to claim 40, wherein the first communication path and the second communication path are extended in a substantially same direction.
Specification