WO2018225553A1 - インクジェットヘッド及びインクジェット記録装置 - Google Patents
インクジェットヘッド及びインクジェット記録装置 Download PDFInfo
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- WO2018225553A1 WO2018225553A1 PCT/JP2018/020289 JP2018020289W WO2018225553A1 WO 2018225553 A1 WO2018225553 A1 WO 2018225553A1 JP 2018020289 W JP2018020289 W JP 2018020289W WO 2018225553 A1 WO2018225553 A1 WO 2018225553A1
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- WIPO (PCT)
- Prior art keywords
- ink discharge
- ink
- discharge path
- pressure chambers
- inkjet head
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/18—Ink recirculation systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/14—Structure thereof only for on-demand ink jet heads
- B41J2/14201—Structure of print heads with piezoelectric elements
- B41J2/14209—Structure of print heads with piezoelectric elements of finger type, chamber walls consisting integrally of piezoelectric material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/14—Structure thereof only for on-demand ink jet heads
- B41J2002/14403—Structure thereof only for on-demand ink jet heads including a filter
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/14—Structure thereof only for on-demand ink jet heads
- B41J2002/14419—Manifold
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
- B41J2202/01—Embodiments of or processes related to ink-jet heads
- B41J2202/12—Embodiments of or processes related to ink-jet heads with ink circulating through the whole print head
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
- B41J2202/01—Embodiments of or processes related to ink-jet heads
- B41J2202/20—Modules
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
- B41J2202/01—Embodiments of or processes related to ink-jet heads
- B41J2202/21—Line printing
Definitions
- the present invention relates to an inkjet head and an inkjet recording apparatus.
- an ink jet recording apparatus that forms an image on a recording medium by ejecting ink stored in a pressure chamber from a plurality of nozzles provided in the ink jet head is known.
- the nozzles are clogged due to bubbles generated in the ink jet head, foreign matters mixed therein, or the like, resulting in problems such as defective injection.
- the ink viscosity near the nozzle may increase due to sedimentation of ink particles, and it may be difficult to obtain stable ink ejection performance.
- Patent Document 1 discloses an ink jet head provided with an individual ink discharge path capable of discharging ink from each pressure chamber and a common ink discharge path where a plurality of individual ink discharge paths merge in the head. Has been.
- the outer surface DS of the head chip 1 shown in the figure is an outer surface along the longitudinal direction of the head chip 1, and the nozzle 111 and the pressure chamber 131 connected thereto form a row (R1, R2) along the outer surface DS. . Between the outer surface DS and the central plane DC when vertically penetrating into the interior, two rows of nozzles 111 and pressure chambers 131 connected to the nozzles 111 are configured, for example.
- the common ink discharge path 133 is extended in the direction along the outer surface DS in order to receive the merging of the individual ink discharge paths 121 from the plurality of pressure chambers 131 forming a row in the direction along the outer surface DS.
- the outer surface DS to the center plane DC will be described by dividing into regions D11 to D15 as illustrated in the depth direction perpendicular to the inner surface DS.
- the thermal conditions are not uniform over the regions D11-D15. This is because the common ink discharge path 133 has a cooling effect and a heat insulating effect because a relatively large amount of ink flows.
- the temperature distribution TD when the high heat source is outside the outer surface DS is shown in the figure.
- the region D13 has a single common ink discharge path 133 up to the outer surface DS, so that heat is not easily transmitted compared to the region D11, and the temperature is relatively low. Therefore, the ink temperature in the pressure chamber 131 in the region D11 is relatively high, the ink temperature in the pressure chamber 131 in the region D13 is relatively low, and vice versa when dissipating heat to the outside. There is a problem that the image quality may be affected because the temperature of the image becomes uneven. In FIG. 16, only one side region from the outer surface DS to the center plane DC is shown, but it is usually configured symmetrically in the region from the opposite outer surface to the center plane DC.
- the present invention has been made in view of such problems, and an object of the present invention is to provide an ink jet head and an ink jet recording apparatus that can alleviate temperature imbalance in each pressure chamber in the head chip. That is.
- the invention according to claim 1 is an inkjet head, A plurality of nozzles for ejecting ink; A plurality of pressure chambers communicating with each of the plurality of nozzles and storing ink; A plurality of pressure generating means provided corresponding to each of the plurality of pressure chambers, for applying pressure to the ink in the pressure chamber; A plurality of individual ink discharge paths that are branched from each of the plurality of pressure chambers and capable of discharging ink in the plurality of pressure chambers; A common ink discharge path connected to the plurality of individual ink discharge paths, The plurality of nozzles and the plurality of pressure chambers form a row in a direction along two opposing outer surfaces of the head chip, and a plurality of the rows are provided in a direction perpendicular to the outer surface, The common ink discharge path extends in a direction along the two outer surfaces; The common ink discharge path is disposed only in one or both of the outermost regions adjacent to one of the outer surfaces and
- the invention according to claim 2 is the ink jet head according to claim 1, Three or more rows are provided.
- the invention according to claim 3 is the ink jet head according to claim 1 or 2, The columns are provided in even columns.
- the inkjet head according to any one of the first to third aspects, The common ink discharge path and the one common ink through the one line by the individual ink discharge path belonging to one row and provided between the two adjacent pressure chambers.
- the pressure chambers belonging to other rows arranged on the opposite side of the discharge path are connected.
- the invention according to claim 5 is the inkjet head according to any one of claims 1 to 4,
- the head chip includes, in order, a nozzle substrate provided with the plurality of nozzles, a flow path spacer substrate provided with the plurality of individual ink discharge paths, and a pressure chamber substrate provided with the plurality of pressure chambers. It is configured by stacking.
- the invention according to claim 6 is the inkjet head according to any one of claims 1 to 5,
- the row is configured by alternately arranging the pressure chambers and air chambers isolated from the ink flow path,
- the individual ink discharge path is disposed so as to overlap the air chamber when viewed in the axial direction of the nozzle.
- the invention according to claim 7 is the inkjet head according to any one of claims 1 to 6, At least two individual ink discharge paths are provided in each of the plurality of pressure chambers.
- the invention according to claim 8 is the inkjet head according to any one of claims 1 to 7,
- the common ink discharge path is arranged in both the outermost regions.
- the invention according to claim 9 is the inkjet head according to any one of claims 1 to 8,
- the common ink discharge path is disposed in the central region.
- the invention according to claim 10 is the ink jet head according to claim 9, Two of the common ink discharge paths are arranged in the central region without interposing the row.
- the invention according to claim 11 is an ink jet recording apparatus, An inkjet head according to any one of claims 1 to 10, Ink supply means for generating a circulating flow from the pressure chamber to the individual ink discharge path; Is provided.
- an ink jet head and an ink jet recording apparatus that can alleviate the temperature imbalance of each pressure chamber in the head chip.
- FIG. 1 Schematic diagram showing inkjet recording device Bottom view of head unit Perspective view of inkjet head Cross section of inkjet head Exploded perspective view of inkjet head Exploded perspective view of head chip Plan view of pressure chamber substrate Bottom view of pressure chamber substrate Plan view of channel spacer substrate Bottom view of channel spacer substrate Top view of the nozzle substrate Sectional view of the head chip when cut with IXA-IXA Cross section of the head chip when cut with IXB-IXB Cross section of the head chip when cut with XA-XB Cross section of the head chip when cut with XA-XB Schematic diagram showing the ink circulation system Schematic diagram showing the layout of an example of each element in the head chip Schematic diagram showing the arrangement of another example of each element in the head chip in a plan view Schematic diagram showing the arrangement of another example of each element in the head chip in a plan view Schematic diagram showing the arrangement of another example of each element in the head chip in a plan view Schematic diagram showing the layout of each element in the head chip of the comparative example in a
- the print width direction which is the arrangement direction of the nozzles 111 of the inkjet head 100
- the direction in which the recording medium is conveyed below the nozzles 111 is the front-back direction
- the left-right direction is the direction in which the recording medium is conveyed below the nozzles 111
- the direction perpendicular to the front-rear direction will be described as the vertical direction.
- the arrow in the flow path of drawing shows the direction through which ink flows.
- the ink jet recording apparatus 200 includes a paper feed unit 210, an image recording unit 220, a paper discharge unit 230, an ink circulation system 8 (see FIG. 11) as an ink supply unit, and the like.
- the ink jet recording apparatus 200 conveys the recording medium M stored in the paper feeding unit 210 to the image recording unit 220, forms an image on the recording medium M with the image recording unit 220, and discharges the recording medium M on which the image is formed. Transport to paper section 230.
- the paper feed unit 210 includes a paper feed tray 211 that stores the recording medium M, and a medium supply unit 212 that conveys and supplies the recording medium M from the paper feed tray 211 to the image recording unit 220.
- the medium supply unit 212 includes a ring-shaped belt that is supported by two rollers on the inside, and the recording medium M is removed from the paper feed tray 211 by rotating the roller while the recording medium M is placed on the belt. The image is transferred to the image recording unit 220.
- the image recording unit 220 includes a transport drum 221, a delivery unit 222, a heating unit 223, a head unit 224, a fixing unit 225, a delivery unit 226, and the like.
- the transport drum 221 has a cylindrical surface, and the outer peripheral surface thereof is a transport surface on which the recording medium M is placed.
- the conveyance drum 221 conveys the recording medium M along the conveyance surface by rotating in the direction of the arrow in FIG. 1 while holding the recording medium M on the conveyance surface.
- the transport drum 221 includes a claw portion and an air intake portion (not shown), presses the end of the recording medium M by the claw portion, and sucks the recording medium M to the transport surface by the air intake portion. The recording medium M is held.
- the delivery unit 222 is provided at a position between the medium supply unit 212 and the conveyance drum 221 of the paper supply unit 210, and picks up one end of the recording medium M conveyed from the medium supply unit 212 by the swing arm unit 222a. Then, it is delivered to the transport drum 221 through the delivery drum 222b.
- the heating unit 223 is provided between the arrangement position of the transfer drum 222b and the arrangement position of the head unit 224, and the recording medium M conveyed by the conveyance drum 221 has a temperature within a predetermined temperature range. Heat M.
- the heating unit 223 includes, for example, an infrared heater, and energizes the infrared heater based on a control signal supplied from a control unit (not shown) to cause the heater to generate heat.
- the head unit 224 forms an image by ejecting ink to the recording medium M at an appropriate timing according to the rotation of the transport drum 221 holding the recording medium M based on the image data.
- the head unit 224 is disposed at a predetermined distance with the ink ejection surface facing the transport drum 221.
- four head units 224 corresponding respectively to four colors of ink of yellow (Y), magenta (M), cyan (C), and black (K) are included in the recording medium M.
- Y, M, C, and K black
- the head unit 224 for example, as shown in FIG. 2, a pair of inkjet heads 100 adjacent to each other in the front-rear direction are arranged in a staggered manner at different positions in the front-rear direction. Further, the head unit 224 is used with its position relative to the rotation axis of the transport drum 221 fixed when recording an image. That is, the ink jet recording apparatus 200 is an ink jet recording apparatus 200 that performs one-pass drawing type image recording using a line head.
- the fixing unit 225 includes a light emitting unit arranged over the width of the transport drum 221 in the X direction, and irradiates the recording medium M placed on the transport drum 221 with energy rays such as ultraviolet rays from the light emitting unit. Then, the ink ejected on the recording medium M is cured and fixed.
- the light emitting unit of the fixing unit 225 is disposed opposite to the conveyance surface on the downstream side of the arrangement position of the head unit 224 and the upstream side of the arrangement position of the delivery drum 226a of the delivery unit 226 in the conveyance direction.
- the delivery unit 226 includes a belt loop 226b having an annular belt supported on the inside by two rollers, and a cylindrical delivery drum 226a that delivers the recording medium M from the transport drum 221 to the belt loop 226b.
- the recording medium M transferred from the transport drum 221 onto the belt loop 226b by the transfer drum 226a is transported by the belt loop 226b and sent to the paper discharge unit 230.
- the paper discharge unit 230 includes a plate-shaped paper discharge tray 231 on which the recording medium P sent out from the image recording unit 220 by the delivery unit 226 is placed.
- the inkjet head 100 includes a head chip 1, a wiring board 2 on which the head chip 1 is disposed, a wiring board 2, and a flexible board 3.
- a manifold 5 for storing ink to be supplied to the pressure chamber 131 in the head chip 1, a housing 6 in which the manifold 5 is housed, and a bottom opening of the housing 6 are closed.
- the cap receiving plate 7 attached in this way, the cover member 9 attached to the housing 6 and the like are provided.
- 3A, illustration of the manifold 5 is omitted, and in FIG. 3B and FIG. 4, illustration of the cover member 9 is omitted.
- an example in which the number of nozzles 111 of the head chip 1 is four will be basically described.
- the head chip 1 is a substantially quadrangular prism-like member elongated in the left-right direction, and is configured by sequentially stacking a pressure chamber substrate 13, a flow path spacer substrate 12, and a nozzle substrate 11 (FIGS. 5 to 11). ).
- the pressure chamber substrate 13 is provided with a pressure chamber 131, an air chamber 132, a common ink discharge path 133, and the like (see FIGS. 5, 6A, and 6B).
- a large number of pressure chambers 131 and air chambers 132 are provided so as to be alternately arranged in the left-right direction, and are provided in four rows in the front-rear direction.
- the pressure chamber 131 has a substantially rectangular cross section and is formed along the vertical direction.
- the pressure chamber 131 has an inlet on the upper surface of the pressure chamber substrate 13 and an outlet on the lower surface.
- the pressure chamber 131 communicates with the ink reservoir 51 at the upper end, and ink is supplied from the ink reservoir 51 to the pressure chamber 131 and ejected from the nozzle 111 into the pressure chamber 131. Ink for storing is stored. Further, the pressure chamber 131 is formed along the vertical direction so as to have a substantially rectangular cross section of the same area, straddling the pressure chamber substrate 13 and the flow path spacer substrate 12. This part communicates with the nozzle 111 (see FIG. 9A, FIG. 9B, etc.).
- the air chamber 132 has a substantially rectangular cross section that is slightly larger than the pressure chamber 131 and is formed to be parallel to the pressure chamber 131 along the vertical direction. Further, unlike the pressure chamber 131, the air chamber 132 is not communicated with the ink reservoir 51, so that ink does not flow into the air chamber 132. Moreover, the air chamber 132 is not connected also to the nozzle 111 (refer FIG. 9A, FIG. 9B etc.).
- the pressure chamber 131 and the air chamber 132 are formed to be separated from each other by a partition wall 136 as pressure generating means formed of a piezoelectric material (see FIG. 10A).
- the partition wall 136 is provided with a drive electrode (not shown), and when a voltage is applied to the drive electrode, the partition wall 136 portion between the adjacent pressure chambers 131 repeats a shear mode type displacement, whereby the inside of the pressure chamber 131. Pressure is applied to the ink.
- the pressure chamber 131 shown in FIGS. 5 to 10 and the like does not use the pressure chamber 131 located at the end in the left-right direction, which has the partition wall 136 only on one side, and the pressure chamber 131 on the other side.
- the chamber 131 is used.
- the air chamber 132 may not be provided and only the pressure chamber 131 may be formed, it is preferable to alternately provide the pressure chamber 131 and the air chamber 132 as described above. Accordingly, the pressure chambers 131 can be prevented from being adjacent to each other, so that when the partition wall 136 adjacent to one pressure chamber 131 is deformed, the other pressure chambers 131 are not affected.
- the common ink discharge path 133 is configured by connecting a first common ink discharge path 134 and a second common ink discharge path 135 (see FIGS. 5 and 6B and the like).
- the first common ink discharge path 134 avoids a portion where the pressure chamber 131 and the air chamber 132 are provided on the lower surface side of the pressure chamber substrate 13, so that the front side, the rear side, and the center portion of the head chip 1 are disposed.
- three rows are provided along the left-right direction.
- a plurality of individual ink discharge paths 121 provided on the flow path spacer substrate 12 are connected to the lower surface side of the first common ink discharge path 134, and these individual ink discharge paths 121 (second individual ink discharge paths 123) are connected.
- the first common ink discharge path 134 (FIGS. 6B, 7A, and 9A).
- the first common ink discharge path 134 is connected to a second common ink discharge path 135 that can discharge ink to the outside of the head chip 1 near the right end. Therefore, the first common ink discharge path 134 is a flow path in which the ink flowing from the individual ink discharge path 121 (second individual ink discharge path 123) flows toward the second common ink discharge path 135. .
- the second common ink discharge path 135 is formed along the vertical direction, like the pressure chamber 131.
- the second common ink discharge path 135 has a lower surface side of the pressure chamber substrate 13 communicating with the first common ink discharge path 134, and an upper surface side thereof connected with the discharge liquid chamber 57. This is a flow path for discharging the ink flowing from 134 toward the upper side (the side opposite to the nozzle substrate 11 side) to the outside of the head chip 1.
- the second common ink discharge path 135 is provided near the right end of the head chip 1 and communicates with the first common ink discharge path 134. Further, by providing the second common ink discharge path 135 so as to have a larger volume than the individual pressure chambers 131, the ink discharge efficiency can be increased.
- the flow path spacer substrate 12 is formed with a pressure chamber 131 and an individual ink discharge path 121 branched from the pressure chamber 131 (FIGS. 5, 7A, 7B, 9A and 9A and 9B). 9B etc.).
- the pressure chamber 131 is formed along the vertical direction so as to straddle the flow path spacer substrate 12 and the pressure chamber substrate 13 and to have a substantially rectangular cross section of the same area.
- the individual ink discharge path 121 has one end connected to the pressure chamber 131 and the other end connected to the first common ink discharge path 134, and discharges the ink in the pressure chamber 131 to the first common ink discharge path 134. It is a flow path. It is preferable that at least two individual ink discharge paths 121 are provided in each of the pressure chambers 131 from the viewpoint of facilitating discharge of bubbles, foreign matter, and the like together with ink. In addition, for example, as shown in FIGS. 9A and 9B, two individual ink discharge paths 121 are provided, one each in the front direction and the rear direction of the pressure chamber 131, so that bubbles, foreign matters, and the like can be formed together with the ink. It is preferable because the effect of facilitating discharge can be obtained and the production efficiency is high.
- the individual ink discharge path 121 is configured by connecting a first individual ink discharge path 122 and a second individual ink discharge path 123.
- One end of the first individual ink discharge path 122 is connected to the pressure chamber 131, and extends in the front-rear direction on the lower surface side portion of the flow path spacer substrate 12.
- the second individual ink discharge path 123 is connected to the other end of the first individual ink discharge path 122, extends upward, and is connected to the first common ink discharge path 134.
- a plurality of nozzles 111 and a plurality of pressure chambers 131 are arranged in a direction (left-right direction) along two opposing outer surfaces DS, DS of the head chip 1 (hereinafter referred to as “channel”).
- 4 rows (referred to as R1 to R4) are provided side by side in the direction (front-rear direction) perpendicular to the outer surface DS.
- a first common ink discharge path 134 is extended in a direction (left-right direction) along the two outer surfaces DS, DS.
- one outer surface DS to the other outer surface DS will be described by dividing into regions D1 to D7 as illustrated in the depth direction perpendicular to the inner surface DS.
- the first common ink discharge path 134 includes both outermost regions (D1 + D2, D6 + D7) close to one of the outer surfaces DS without passing through any channel row R1-R4, and a central region between the two outer surfaces DS, DS. It is arranged on both sides of D4 and is arranged only in these areas. That is, the first common ink discharge path 134 is disposed in the regions D2, D4, and D6, the regions D1 and D7 are outer wall portions to the outer surface DS, and the region D3 between the region D2 and the central region D4 includes Two channel rows R1, R2 are arranged, and two channel rows R3, R4 are arranged in a region D5 between the region D6 and the central region D4.
- the number of channel columns R1-R4 is three or more and an even number.
- the first common ink discharge path 134 passing through the center plane DC can be arranged, and the same number of channel rows can be arranged on both sides of the center plane DC, so that the thermal conditions can be made uniform.
- An individual ink discharge path 121 which belongs to one row and is provided between two pressure chambers 131 adjacent to each other is connected to one first common ink discharge path 134 via the one row.
- a pressure chamber 131 belonging to another row arranged on the opposite side of the first common ink discharge path 134 is connected.
- the one column will be described as a channel column R1.
- the first common ink discharge path 134 disposed in the region D2 and the channel line R2 are separated by the individual ink discharge path 121 belonging to the channel line R1 and provided between the two pressure chambers 131 and 131 adjacent to each other.
- the pressure chamber 131 to which it belongs is connected.
- the one column will be described as a channel column R2.
- the first common ink discharge path 134 disposed in the region D4 and the channel line R1 are separated by the individual ink discharge path 121 belonging to the channel row R2 and provided between the two pressure chambers 131 and 131 adjacent to each other.
- the pressure chamber 131 to which it belongs is connected.
- the region D5. With this structure, the pressure chamber 131 of each channel row R1-R4 can be connected to the first common ink discharge paths 134 and 134 on both sides by extending the individual ink discharge paths 121 in the front-rear direction. As a result, it is possible to improve the circulation of the ink and alleviate the temperature imbalance in the head chip 1.
- the channel row is configured by alternately arranging the pressure chambers 131 and the air chambers 132 isolated from the ink flow paths as described above. As shown in FIG. 12, the individual ink discharge path 121 is disposed so as to overlap the air chamber 132 when viewed in the axial direction (vertical direction) of the nozzle 111. Thereby, thermal conductivity is improved.
- the temperature imbalance in the region D3 is alleviated, the temperature imbalance in the region D5 is also alleviated, and the temperature imbalance in the regions D3 and D5 is also alleviated.
- the temperature distribution TD when the high heat source is outside the outer surface DS is shown in the figure. The darker the temperature distribution TD, the higher the temperature.
- the areas D1 and D7 have a first common ink discharge path 134 up to the outer surface DS, so that external heat is easily transmitted and the temperature rises. Since the areas D3 and D5 have one common ink discharge path 133 before reaching the outer surface DS, heat is not easily transmitted compared to the area D1, but the temperature is relatively low.
- the temperatures in the regions D3 and D5 are made uniform.
- the regions D1 and D7 have a lower temperature than the regions D3 and D5, but the temperature in the regions D3 and D5 remains uniform. Therefore, the ink temperature imbalance in the pressure chambers 131 belonging to all the channel rows R1-R4 is alleviated and the temperature of the ejected ink becomes uniform, so that one of the thermal problems that can affect the image quality can be solved. .
- FIG. 13 shows a structure in which one individual ink discharge path 121 extending from one pressure chamber 131 is connected to a first common ink discharge path 134 that is close.
- the thermal conditions such as the number of the common ink discharge paths 133 up to the outer surface DS are the same. Therefore, the temperatures in the regions D3 and D5 where the channel rows R1-R4 are present are Make uniform.
- FIG. 14 shows a structure in which two first common ink discharge paths 134 are arranged in the central area D4 without interposing a channel row
- FIG. 15 shows a structure in which the common ink discharge paths 133 are not arranged in the central area D4. Show. The presence / absence and number of common ink discharge paths in the central area D4 do not affect the thermal condition of the number of common ink discharge paths 133 up to the outer surface DS. The temperature becomes uniform.
- the channel row is not disposed between the two first common ink discharge paths 134 and 134 in the central region D4. This is because the thermal condition of the number of common ink discharge paths 133 to the outer surface DS differs from the other channel rows.
- the temperature imbalance of each pressure chamber 131 in the head chip 1 can be alleviated.
- the first individual ink discharge path 122 of the present embodiment is provided in the lower surface side portion of the flow path spacer substrate 12 adjacent to the nozzle substrate 11, it is not limited thereto.
- the first individual ink discharge path 122 may be provided so as to straddle both the nozzle substrate 11 and the channel spacer substrate 12, or may be provided only on the nozzle substrate 11, or the bottom surface of the channel spacer substrate 12. It may be provided slightly above the nozzle substrate 11 so as not to be adjacent to the nozzle substrate 11.
- a wiring board 2 is disposed on the upper surface of the head chip 1, and two flexible boards 3 connected to the drive circuit board 4 at both edges along the front-rear direction of the wiring board 2. Is arranged.
- the wiring board 2 is formed in a substantially rectangular plate shape that is long in the left-right direction, and has an opening 22 at a substantially central portion thereof. Each width of the wiring substrate 2 in the left-right direction and the front-rear direction is formed larger than that of the head chip 1.
- the opening 22 is formed in a substantially rectangular shape that is long in the left-right direction.
- the opening 22 is shared with the inlet of each pressure chamber 131 in the head chip 1.
- the outlet of the ink discharge path 135 is exposed to the upper side.
- the flexible board 3 electrically connects the drive circuit board 4 and the electrode part of the wiring board 2, and a signal from the drive circuit board 4 is provided on the partition 136 in the head chip 1 via the flexible board 3.
- the drive electrode can be applied.
- the lower end portion of the manifold 5 is attached and fixed to the outer edge portion of the wiring board 2 by adhesion. That is, the manifold 5 is disposed on the inlet side (upper side) of the pressure chamber 131 of the head chip 1 and is connected to the head chip 1 via the wiring board 2.
- the manifold 5 is a member formed of resin, is provided on the pressure chamber 131 of the head chip 1, and stores ink introduced into the pressure chamber 131. Specifically, as shown in FIG. 3B and the like, the manifold 5 is formed in an elongated shape in the left-right direction, and a hollow main body 52 that constitutes the ink reservoir 51 and a first that constitutes the ink flow path. 1 to 4th ink ports 53 to 56 are provided.
- the ink reservoir 51 is divided into two parts, an upper first liquid chamber 51a and a lower second liquid chamber 51b, by a filter F for removing dust in the ink.
- the first ink port 53 communicates with the upper right end portion of the first liquid chamber 51 a and is used for introducing ink into the ink storage portion 51.
- a first joint 81 a is externally inserted at the tip of the first ink port 53.
- the second ink port 54 communicates with the upper left end of the first liquid chamber 51a, and is used to remove bubbles in the first liquid chamber 51a.
- a second joint 81 b is externally inserted at the tip of the second ink port 54.
- the third ink port 55 communicates with the upper left end of the second liquid chamber 51b and is used to remove bubbles in the second liquid chamber 51b.
- a third joint 82 a is externally inserted at the tip of the third ink port 55.
- the fourth ink port 56 communicates with a discharge liquid chamber 57 that communicates with the second common ink discharge path 135 of the head chip 1, and the ink discharged from the head chip 1 passes through the fourth ink port 56 and is inkjet It is discharged outside the head 100.
- the housing 6 is a member formed by a die-cast method using, for example, aluminum as a material, and is formed long in the left-right direction. Further, the housing 6 is formed so as to be able to accommodate a manifold 5 to which the head chip 1, the wiring substrate 2 and the flexible substrate 3 are attached, and the bottom surface of the housing 6 is opened. In addition, attachment holes 68 for attaching the housing 6 to the printer main body side are formed at both ends in the left-right direction of the housing 6.
- the cap receiving plate 7 has a nozzle opening 71 elongated in the left-right direction at a substantially central portion thereof, and the nozzle substrate 11 is exposed through the nozzle opening 71 so that the housing 6 It is attached to close the bottom opening.
- the ink circulation system 8 is ink supply means for generating a circulation flow of ink from the pressure chamber 131 in the inkjet head 100 to the individual ink discharge path 121.
- the ink circulation system 8 includes a supply sub tank 81, a circulation sub tank 82, a main tank 83, and the like (FIG. 11).
- the supply sub tank 81 is filled with ink to be supplied to the ink reservoir 51 of the manifold 5, and is connected to the first ink port 53 by an ink flow path 84.
- the circulation sub tank 82 is filled with the ink discharged from the discharge liquid chamber 57 of the manifold 5, and is connected to the fourth ink port 56 by the ink flow path 85.
- the supply sub-tank 81 and the circulation sub-tank 82 are provided at different positions in the vertical direction (gravity direction) with respect to the nozzle surface of the head chip 1 (hereinafter also referred to as “position reference surface”).
- a pressure P1 due to a water head difference between the position reference surface and the supply sub tank 81 and a pressure P2 due to a water head difference between the position reference surface and the circulation sub tank 82 are generated.
- the supply sub-tank 81 and the circulation sub-tank 82 are connected by an ink flow path 86. Ink can be returned from the circulation sub-tank 82 to the supply sub-tank 81 by the pressure applied by the pump 88.
- the main tank 83 is filled with ink to be supplied to the supply sub-tank 81, and is connected to the supply sub-tank 81 by the ink flow path 87. Ink can be supplied from the main tank 83 to the supply sub-tank 81 by the pressure applied by the pump 89.
- the pressure P1 and the pressure P2 can be adjusted by appropriately changing the ink filling amount in each sub tank and the position in the vertical direction (gravity direction) of each sub tank.
- the ink in the inkjet head 100 can be circulated at an appropriate circulation flow rate by the pressure difference between the pressure P1 and the pressure P2. Thereby, bubbles, foreign matter, etc. generated in the head chip 1 can be removed, and clogging of the nozzle 111, injection failure, and the like can be suppressed.
- the ink circulation system 8 the method for controlling the circulation of the ink by the water head difference has been described.
- the configuration can be appropriately changed as long as the configuration can generate the ink circulation.
- the present invention is not limited thereto.
- the head chip 1 of the present embodiment an example in which the nozzle substrate 11, the flow path spacer substrate 12, and the pressure chamber substrate 13 are sequentially stacked is shown, but the present invention is not limited thereto, and the nozzle substrate 11 and the pressure chamber substrate 13 A two-layer structure may be used.
- an individual ink discharge path 121 may be provided on at least one of the nozzle substrate 11 and the pressure chamber substrate 13.
- the inkjet head 100 of the present embodiment it is only necessary to provide a means for applying pressure to the ink in the pressure chamber 131, and the present invention is not limited to this.
- the ink in the second common ink discharge path 135 may be discharged without being circulated. It is good also as a structure which can select whether to discharge.
- the present invention is not limited thereto.
- it may be configured to open on any side surface of the head chip 1 in the front-rear and left-right directions, or may have a bent portion that changes the direction of ink flow in the middle of the flow path.
- a total of four channel rows are arranged with two rows on one side with respect to the center plane DC. You may arrange
- even-numbered channel columns are arranged, but the present invention is not limited to this, and three or more odd-numbered channel columns may be arranged.
- one channel row may be arranged in the central region D4, and the same number of channel rows may be arranged on both sides thereof. Also in this case, the thermal condition of the number of common ink discharge paths 133 up to the outer surface DS is the same.
- the present invention can be used for an inkjet head and an inkjet recording apparatus.
- Ink circulation system (ink supply means) 11 Nozzle substrate 111 Nozzle 12 Flow path spacer substrate 121 Individual ink discharge path 122 First individual ink discharge path 123 Second individual ink discharge path 13 Pressure chamber substrate 131 Pressure chamber 132 Air chamber 133 Common ink discharge path 134 First common ink discharge Path 135 Second common ink discharge path 136 Partition (pressure generating means) 100 Inkjet head 200 Inkjet recording apparatus
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- Ink Jet (AREA)
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Abstract
Description
このようなインクジェット記録装置では、インクジェットヘッド内に発生した気泡や混入した異物等によって、ノズルが詰まり、射出不良等の問題が生じる場合がある。また、インクの種類によっては、長時間使用しないままにしておくと、インク粒子の沈降等によってノズル付近のインク粘度が高まり、安定したインクの射出性能が得難い場合がある。
例えば、特許文献1には、ヘッド内部に、各圧力室からのインクを排出可能な個別インク排出路と、複数の個別インク排出路が合流する共通インク排出路と、を備えたインクジェットヘッドが開示されている。
図示するヘッドチップ1の外表面DSは、ヘッドチップ1の長手方向に沿った外表面であり、外表面DSに沿ってノズル111及びこれに接続する圧力室131が列(R1,R2)を成す。外表面DSから垂直に内部へ侵入した際の中心面DCまでの間に、ノズル111及びこれに接続する圧力室131の列が例えば図示するように2列構成される。
共通インク排出路133は、外表面DSに沿った方向に列を成す複数の圧力室131からの各個別インク排出路121の合流を受けるために、外表面DSに沿った方向に延設されている。
このようなヘッドチップ1において外表面DSから中心面DCまでを、外表面DSから垂直に内部への深さ方向に図示するように領域D11-D15に分けて説明する。
領域D11-D15に亘って熱的条件は均一ではない。共通インク排出路133は、比較的多くのインクが流通するため冷却効果や断熱効果があるからである。例えば、外表面DSの外に高熱源がある場合の温度分布TDを図中に示す。温度分布TDは濃いほど高温であることを示す。領域D11は、外表面DSまでの間に共通インク排出路133が無いため、外の熱が伝わりやすく高温化する。これに対し領域D13は、外表面DSまでの間に共通インク排出路133が1本あるため、領域D11に比較して熱が伝わりにくく比較的低温である。
したがって、領域D11にある圧力室131のインク温度は比較的高く、領域D13にある圧力室131のインク温度は比較的低くなり、外部に放熱する場合はその逆となり、いずれにしても射出するインクの温度が不均一となるから画質に影響し得るという問題があった。
なお、図16にあっては、外表面DSから中心面DCまでの片側領域のみを示すが、反対側の外表面から中心面DCまでの領域に対称的に構成されることが通常である。
インクを射出する複数のノズルと、
前記複数のノズルの各々に連通し、インクが貯留された複数の圧力室と、
前記複数の圧力室の各々に対応して設けられ、前記圧力室内のインクに圧力を加える複数の圧力発生手段と、
前記複数の圧力室の各々から分岐して設けられ、当該複数の圧力室内のインクを排出可能な複数の個別インク排出路と、
前記複数の個別インク排出路が連結された共通インク排出路と、を備え、
ヘッドチップの相対する2つの外表面に沿った方向に前記複数のノズル及び前記複数の圧力室が列を成し、当該列が前記外表面に垂直な方向に並んで複数設けられ、
前記2つの外表面に沿った方向に、前記共通インク排出路が延設され、
前記共通インク排出路は、前記列を介さず前記外表面の一方に近接する両最外領域及び前記2つの外表面の間の中央領域のうちいずれか一方又は双方の領域のみに配置されている。
前記列は、3列以上設けられている。
前記列は、偶数列設けられている。
一の列に属し、互いに隣り合う2つの前記圧力室の間を通って設けられた前記個別インク排出路により、一の前記共通インク排出路と、前記一の列を介して当該一の共通インク排出路の逆側に配置された他の列に属する前記圧力室とが連結されている。
前記ヘッドチップは、前記複数のノズルが設けられたノズル基板と、前記複数の個別インク排出路が設けられた流路スペーサー基板と、前記複数の圧力室が設けられた圧力室基板と、が順に積層されて構成されている。
前記列は、前記圧力室と、インク流路から隔絶された空気室とが交互に配置されて構成され、
前記個別インク排出路は、前記ノズルの軸方向に見て前記空気室に重なるように配置されている。
前記個別インク排出路は、前記複数の圧力室の各々に少なくとも二つ設けられている。
前記両最外領域の双方に前記共通インク排出路が配置されている。
前記中央領域に前記共通インク排出路が配置されている。
前記中央領域に前記共通インク排出路が、前記列を間に介さずに2本配置されている。
請求項1から請求項10までのいずれか一項に記載のインクジェットヘッドと、
前記圧力室から前記個別インク排出路への循環流を発生させるためのインクの供給手段と、
を備える。
インクジェット記録装置200は、図1に示すように、給紙部210と、画像記録部220と、排紙部230と、インクの供給手段としてのインク循環系8(図11参照)等を備える。インクジェット記録装置200は、給紙部210に格納された記録媒体Mを画像記録部220に搬送し、画像記録部220で記録媒体Mに画像を形成し、画像が形成された記録媒体Mを排紙部230に搬送する。
本実施形態のインクジェットヘッド100は、図3A、図3B及び図4等に示すように、ヘッドチップ1と、ヘッドチップ1が配設された配線基板2と、配線基板2とフレキシブル基板3を介して接続された駆動回路基板4と、ヘッドチップ1内の圧力室131に供給するインクを貯留するマニホールド5と、内側にマニホールド5が収納された筐体6と、筐体6の底面開口を塞ぐように取り付けられたキャップ受板7と、筐体6に取り付けられたカバー部材9等を備えている。
なお、図3Aでは、マニホールド5の図示を省略しており、図3B及び図4では、カバー部材9の図示を省略している。
また、本実施形態では、ヘッドチップ1のノズル111の列数が4列である例を基本に説明する。
圧力室131と空気室132は左右方向に交互に配置されるように多数設けられ、前後方向に4列で設けられている。
圧力室131は、略矩形状の断面を有し上下方向に沿って形成されており、圧力室基板13の上面に入口を有し、下面に出口を有している。また、圧力室131は、上方向の端部でインク貯留部51に連通しており、圧力室131には当該インク貯留部51からインクが供給され、圧力室131内部にはノズル111から射出するためのインクを貯留する。また、圧力室131は、圧力室基板13と流路スペーサー基板12とに跨がって、同一面積の略矩形状の断面を有するように上下方向に沿って形成されており、下方向の端部でノズル111に連通している(図9A、図9B等参照)。
第1共通インク排出路134は、圧力室基板13の下面側に、圧力室131及び空気室132が設けられた部分を避けるようにして、ヘッドチップ1の前側、後側、及びそれらの中央部に、3列並んで左右方向に沿って設けられている。また、第1共通インク排出路134の下面側には、流路スペーサー基板12に設けられた個別インク排出路121が複数連結しており、それら個別インク排出路121(第2個別インク排出路123)から流れてくるインクが第1共通インク排出路134で合流できるようになっている(図6B、図7A及び図9A)。また、第1共通インク排出路134は、右端部付近で、ヘッドチップ1外にインクを排出可能な第2共通インク排出路135に連結している。したがって、第1共通インク排出路134は、個別インク排出路121(第2個別インク排出路123)から流れてきたインクが、当該第2共通インク排出路135に向かって流れる流路となっている。
圧力室131は、流路スペーサー基板12と圧力室基板13とを跨がって、同一面積の略矩形状の断面を有するように上下方向に沿って形成されている。
個別インク排出路121は、気泡や異物等をインクとともに排出しやすくする観点から、圧力室131の各々に少なくとも二つ設けられていることが好ましい。また、個別インク排出路121は、例えば、図9A及び図9Bに示すように、圧力室131の前方向と後方向にそれぞれ一つずつ、計二つ設けることが、気泡や異物等をインクとともに排出しやすくする効果を得ることができ、かつ製造効率も高いため好ましい。
また、2つの外表面DS,DSに沿った方向(左右方向)に、第1共通インク排出路134が延設されている。
ヘッドチップ1において一方の外表面DSから他方の外表面DSまでを、外表面DSから垂直に内部への深さ方向に図示するように領域D1-D7に分けて説明する。
第1共通インク排出路134は、いずれのチャネル列R1-R4をも介さず外表面DSの一方に近接する両最外領域(D1+D2,D6+D7)及び2つの外表面DS,DSの間の中央領域D4の双方に配置され、これらの領域のみに配置されている。
すなわち、第1共通インク排出路134は領域D2,D4,D6に配置され、領域D1,D7は、外表面DSまでの外壁部であり、領域D2と中央領域D4の間の領域D3には、2列のチャネル列R1,R2が配置されており、領域D6と中央領域D4の間の領域D5には、2列のチャネル列R3,R4が配置されている。チャネル列R1-R4の列数が3以上かつ偶数である。偶数列とすることで、中心面DCを通る第1共通インク排出路134を配置するとともに、中心面DCの両側に同数のチャネル列を配置することができ、熱的条件を均一化できる。
例えば、前記一の列を、チャネル列R1として説明する。チャネル列R1に属し、互いに隣り合う2つの圧力室131,131の間を通って設けられた個別インク排出路121により、領域D2に配置された第1共通インク排出路134と、チャネル列R2に属する圧力室131とが連結されている。
前記一の列を、チャネル列R2として説明する。チャネル列R2に属し、互いに隣り合う2つの圧力室131,131の間を通って設けられた個別インク排出路121により、領域D4に配置された第1共通インク排出路134と、チャネル列R1に属する圧力室131とが連結されている。
領域D5についても同様である。
かかる構造により、各チャネル列R1-R4の圧力室131は、前後方向の双方に個別インク排出路121を延ばし両側の第1共通インク排出路134,134に連結することができる。これにより、インクの循環性を高めるとともに、ヘッドチップ1内の温度の不均衡を緩和することができる。
例えば、外表面DSの外に高熱源がある場合の温度分布TDを図中に示す。温度分布TDは濃いほど高温であることを示す。領域D1,D7は、外表面DSまでの間に第1共通インク排出路134が無いため、外の熱が伝わりやすく高温化する。領域D3,D5は、外表面DSまでの間に共通インク排出路133が1本あるため、領域D1に比較して熱が伝わりにくく比較的低温であるが、外表面DSまでの間の共通インク排出路133の本数という熱的条件が同一であるため、領域D3,D5内の温度は均一化する。外部に放熱する場合はその逆となり、領域D3,D5より領域D1,D7が低温になるが、領域D3,D5内の温度が均一化することは変わりない。
したがって、すべてのチャネル列R1-R4に属する圧力室131のインク温度の不均衡は緩和され、射出するインクの温度が均一となるから画質に影響し得る熱問題の一つを解消することができる。
図13に、1つの圧力室131から延びる個別インク排出路121を1本とし、近い第1共通インク排出路134に連結した構造を示す。かかるヘッドチップ1の構造であっても、外表面DSまでの間の共通インク排出路133の本数という熱的条件が同一であるため、チャネル列R1-R4のある領域D3,D5内の温度は均一化する。
図14に示すヘッドチップ1において、中央領域D4の2本の第1共通インク排出路134,134間にチャネル列を配置しないのは、そこにチャネル列を配置してしまうと、そのチャネル列と他のチャネル列とで外表面DSまでの間の共通インク排出路133の本数という熱的条件が異なってしまうからである。
第2インクポート54は、第1液室51aの左側上端部に連通されており、第1液室51a内の気泡を除去するために用いられる。また、第2インクポート54の先端部には、第2ジョイント81bが外挿されている。
第3インクポート55は、第2液室51bの左側上端部に連通されており、第2液室51b内の気泡を除去するために用いられる。また、第3インクポート55の先端部には、第3ジョイント82aが外挿されている。
第4インクポート56は、ヘッドチップ1の第2共通インク排出路135に連通する排出用液室57に連通されており、ヘッドチップ1から排出されたインクが、第4インクポート56を通して、インクジェットヘッド100の外部に排出される。
インク循環系8は、インクジェットヘッド100内の圧力室131から個別インク排出路121へのインクの循環流を発生させるためのインクの供給手段である。インク循環系8は、供給用サブタンク81、循環用サブタンク82及びメインタンク83等によって構成されている(図11)。
循環用サブタンク82は、マニホールド5の排出用液室57から排出されたインクが充填されており、インク流路85によって第4インクポート56に接続されている。
また、供給用サブタンク81と循環用サブタンク82は、ヘッドチップ1のノズル面(以下、「位置基準面」ともいう。)に対して、上下方向(重力方向)に異なる位置に設けられている。これによって、当該位置基準面と供給用サブタンク81の水頭差による圧力P1と、当該位置基準面と循環用サブタンク82との水頭差による圧力P2が生じている。
また、供給用サブタンク81と循環用サブタンク82は、インク流路86で接続されている。そして、ポンプ88によって加えられた圧力によって、循環用サブタンク82から供給用サブタンク81にインクを戻すことができる。
以上で説明した本発明の実施形態は、全ての点で例示であって制限的なものではないと考えられるべきである。すなわち、本発明の範囲は、上記した説明ではなくて特許請求の範囲によって示され、特許請求の範囲と均等の意味及び範囲内での全ての変更が含まれることが意図される。
8 インク循環系(インクの供給手段)
11 ノズル基板
111 ノズル
12 流路スペーサー基板
121 個別インク排出路
122 第1個別インク排出路
123 第2個別インク排出路
13 圧力室基板
131 圧力室
132 空気室
133 共通インク排出路
134 第1共通インク排出路
135 第2共通インク排出路
136 隔壁(圧力発生手段)
100 インクジェットヘッド
200 インクジェット記録装置
Claims (11)
- インクを射出する複数のノズルと、
前記複数のノズルの各々に連通し、インクが貯留された複数の圧力室と、
前記複数の圧力室の各々に対応して設けられ、前記圧力室内のインクに圧力を加える複数の圧力発生手段と、
前記複数の圧力室の各々から分岐して設けられ、当該複数の圧力室内のインクを排出可能な複数の個別インク排出路と、
前記複数の個別インク排出路が連結された共通インク排出路と、を備え、
ヘッドチップの相対する2つの外表面に沿った方向に前記複数のノズル及び前記複数の圧力室が列を成し、当該列が前記外表面に垂直な方向に並んで複数設けられ、
前記2つの外表面に沿った方向に、前記共通インク排出路が延設され、
前記共通インク排出路は、前記列を介さず前記外表面の一方に近接する両最外領域及び前記2つの外表面の間の中央領域のうちいずれか一方又は双方の領域のみに配置されているインクジェットヘッド。 - 前記列は、3列以上設けられている請求項1に記載のインクジェットヘッド。
- 前記列は、偶数列設けられている請求項1又は請求項2に記載のインクジェットヘッド。
- 一の列に属し、互いに隣り合う2つの前記圧力室の間を通って設けられた前記個別インク排出路により、一の前記共通インク排出路と、前記一の列を介して当該一の共通インク排出路の逆側に配置された他の列に属する前記圧力室とが連結されている請求項1から請求項3までのいずれか一項に記載のインクジェットヘッド。
- 前記ヘッドチップは、前記複数のノズルが設けられたノズル基板と、前記複数の個別インク排出路が設けられた流路スペーサー基板と、前記複数の圧力室が設けられた圧力室基板と、が順に積層されて構成されている請求項1から請求項4までのいずれか一項に記載のインクジェットヘッド。
- 前記列は、前記圧力室と、インク流路から隔絶された空気室とが交互に配置されて構成され、
前記個別インク排出路は、前記ノズルの軸方向に見て前記空気室に重なるように配置されている請求項1から請求項5までのいずれか一項に記載のインクジェットヘッド。 - 前記個別インク排出路は、前記複数の圧力室の各々に少なくとも二つ設けられている請求項1から請求項6までのいずれか一項に記載のインクジェットヘッド。
- 前記両最外領域の双方に前記共通インク排出路が配置されている請求項1から請求項7までのいずれか一項に記載のインクジェットヘッド。
- 前記中央領域に前記共通インク排出路が配置されている請求項1から請求項8までのいずれか一項に記載のインクジェットヘッド。
- 前記中央領域に前記共通インク排出路が、前記列を間に介さずに2本配置されている請求項9に記載のインクジェットヘッド。
- 請求項1から請求項10までのいずれか一項に記載のインクジェットヘッドと、
前記圧力室から前記個別インク排出路への循環流を発生させるためのインクの供給手段と、
を備えるインクジェット記録装置。
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