JP3855682B2 - Inkjet recording device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ink jet recording apparatus that includes a recording head that discharges ink supplied from an ink cartridge as ink droplets, and forcibly discharges ink from the recording head to restore the discharging ability of the recording head. .
[0002]
[Prior art]
As shown in FIG. 11, the recording head of the ink jet recording apparatus includes a head main body 51 that ejects ink as ink droplets, and a holder channel 52 that supplies ink from an ink cartridge (not shown) to the head main body 51. And a formed head holder 53.
[0003]
The head holder 53 includes an ink supply needle 54 that is inserted into the ink supply port of the ink cartridge and receives ink supply, and a filter 55 that filters ink flowing from the ink supply needle 54 to the holder flow path 52. Is provided. On the other hand, the head main body 51 is formed with a head flow path 58 that communicates with the holder flow path 52 and supplies the filtered ink to the reservoir 57 in the vicinity of the nozzle plate 56.
[0004]
A seal plate 59 is provided between the head holder 53 and the head main body 51 to seal between the holder flow path 52 and the head flow path 58. As shown in FIG. 12, the seal plate 59 is provided with a communication port 60 that allows the holder flow path 52 and the head flow path 58 to communicate with each other.
[0005]
In the recording head, the nozzles 61 of the head main body 51 are arranged in a direction perpendicular to the paper surface of FIG. 11, and two nozzle rows are formed. In this recording head, one of the two nozzle rows discharges black ink supplied from one ink supply needle 54 from all nozzles 61, and the other row is divided into three nozzle groups. , Different types of ink of cyan, magenta, and yellow are ejected.
[0006]
Accordingly, one communication port 60 formed in the seal plate 59 is also formed per one row for the nozzle row that discharges one single color, and three are formed per one row for the nozzle row divided into the other three colors. Has been.
[0007]
The recording head is mounted on a carriage (not shown) together with the ink cartridge, and reciprocates in the width direction of the recording paper by the carriage to eject ink droplets from the nozzles 61 provided on the nozzle plate 56 for printing. The ink consumed by printing passes through the ink supply needle 54, the holder channel 52, and the communication port 60 from the ink cartridge, and passes through the head channel 58 of the head body 51 to the reservoir 57 that communicates with the nozzle 61. To be replenished.
[0008]
In the above recording head, the ink in the vicinity of the nozzle 61 may be thickened when left unused for a long period of time. Since such thickened ink contributes to functional deterioration such as clogging and ejection failure, the ink jet recording apparatus is forced to discharge the thickened ink for cleaning and discharge the nozzle 61. A discharge capacity recovery mechanism for recovering the capacity is provided.
[0009]
The ejection capacity recovery mechanism includes, for example, a cap having a recess formed on the surface, and a suction pump communicating with the recess through an ink discharge path. After the cap is brought into contact with the nozzle surface of the nozzle plate 56 and the nozzle 61 is sealed through the recess, the suction pump is operated to generate a negative pressure in the recess, and the ink is discharged from the nozzle 61. It is designed to be forcibly discharged by suction.
[0010]
[Problems to be solved by the invention]
In the recording head, the contact portion between the communication port 60 of the seal plate 59 and the holder flow path 52 and the contact portion between the communication port 60 and the head flow path 58 are likely to have a step in the flow path space. There is a problem that air bubbles are easily caught on the stepped portion and remain. In a recording head having two nozzle rows as described above, when one row discharges a single color and the other row discharges a plurality of colors (three colors in the above example), it is divided into a plurality of blocks. Because all nozzle openings are sucked under the same conditions during forced suction cleaning, the amount of ink discharged is 3 minutes compared to the nozzle array that ejects a single color in the nozzle array divided into blocks. It becomes 1/3 according to it as much as 1 becomes.
[0011]
That is, in the recording head, if the opening area of the communication port 60 of the seal plate 59 is the same in the nozzle row that discharges a single color and the nozzle row divided into blocks as in the conventional case, the portion of the communication port 60 In the nozzle row divided into blocks, the flow rate per unit area is reduced to one third in proportion to the smaller number of nozzles compared to the nozzle row discharging a single color. In this way, at the communication port 60 where the flow rate per unit area is reduced, bubbles caught on the stepped portion are likely to remain without being removed by suction, which may cause ejection failure. On the other hand, if the suction flow is simply increased to increase the flow rate to a level where there is no problem with the bubble output on the nozzle row divided into blocks, more ink will be discharged from the nozzle row that discharges a single color. As a result, there arises a problem that ink is wasted.
[0012]
The present invention has been made in view of the above circumstances, and is an ink jet type that can discharge air bubbles reliably without consuming wasteful ink by making the ink flow rate uniform at the time of cleaning in channels having different numbers of communicating nozzles. An object is to provide a recording apparatus.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, an ink jet recording apparatus according to the present invention includes a head main body having a plurality of nozzles for ejecting ink droplets and a plurality of head channels communicating with the nozzles, and ink in an ink tank. A head holder formed with a plurality of holder flow paths leading to the flow path, and the opening area of the flow path is changed according to the number of nozzles communicating with the flow path at the connection portion between the holder flow path and the head flow path. It is a summary.
[0014]
That is, the ink jet recording apparatus of the present invention includes a head body having a plurality of nozzles for ejecting ink droplets, a plurality of head flow paths communicating with the nozzles, and a plurality of holders for guiding ink in an ink tank to each head flow path. And a head holder in which a flow path is formed. And in the connection location of the said holder flow path and a head flow path, the opening area of the flow path is changed according to the number of nozzles connected to a flow path. For this reason, in a flow path with a small number of communicating nozzles, since the opening area of the flow path is small, the flow rate of ink per unit area at the time of cleaning is increased, and the flow speed of a flow path with a large number of communicating nozzles is large. The difference becomes smaller. Therefore, the bubbles caught at the connection portion between the holder flow path and the head flow path are almost surely sucked and removed, and it is also possible to prevent unnecessary ink from being discharged from the flow path having a large number of communicating nozzles. .
[0015]
In the ink jet recording apparatus of the present invention, a seal member for sealing the holder flow path and the head flow path is provided between the head holder and the head main body, and the communication for connecting the holder flow path and the head flow path to the seal member is provided. When the opening is formed and the opening area of the communication port is changed according to the number of nozzles communicating with the flow path, the air bubbles adhering to the vicinity of the communication port of the seal member can be reliably sucked and removed.
[0016]
In the ink jet recording apparatus of the present invention, when the seal member is provided between the head holder and the head main body and at least the communication port portion is a seal plate formed of an elastic material, the seal plate communicates. Air bubbles adhering to the vicinity of the mouth can be reliably removed by suction.
[0017]
In the ink jet recording apparatus of the present invention, when the seal member is an adhesive layer formed between the head holder and the head body, air bubbles adhering to the vicinity of the adhesive layer can be reliably removed by suction. .
[0018]
In the ink jet recording apparatus of the present invention, at the connection portion between the holder flow path and the head flow path, the opening area of at least one of the holder flow path and the head flow path is changed according to the number of nozzles communicating with the flow path. In this case, the bubbles caught at the connection portion between the holder flow path and the head flow path can be sucked and removed almost certainly.
[0019]
In the ink jet recording apparatus of the present invention, when the number of nozzles communicating with the flow path is 1 / N of the other flow path, the opening area is set to be 1 / N of the other flow path. In the flow paths with different numbers of communicating nozzles, the ink flow velocity at the junction between the holder flow path and the head flow path at the time of cleaning becomes more uniform, and air bubbles can be reliably discharged without consuming wasteful ink. .
[0020]
In the ink jet recording apparatus of the present invention, the head main body is provided with at least two nozzle arrays, and is divided into a nozzle array communicating with one flow path and n nozzle groups communicating with n flow paths, respectively. In the case of having the nozzle row arranged, the holder flow passage and the head at the time of cleaning between the flow passage communicating with one nozzle row and the flow passage communicating with the nozzle group divided into blocks The ink flow velocity at the junction with the flow path becomes uniform, and air bubbles can be reliably discharged without consuming wasteful ink.
[0021]
In the ink jet recording apparatus of the present invention, when different types of ink are ejected from the nozzles communicating with each flow path, the holder flow during cleaning is between the flow paths through which different types of ink circulate. The ink flow velocity at the junction between the path and the head channel is uniform, and the bubbles can be reliably discharged without consuming unnecessary ink.
[0022]
In the ink jet recording apparatus of the present invention, a blocking member that seals the nozzle of the head main body through a negative pressure generating space, and a negative pressure is applied to the negative pressure generating space of the blocking member to suck ink in each channel. In the case where the suction means is provided, the ink flow rate at the junction between the holder flow path and the head flow path is uniform between the flow paths at the time of cleaning in which the nozzle is forcibly sucked by the suction means. Air bubbles can be reliably discharged without consuming ink.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described in detail.
[0024]
1 and 2 are diagrams showing an example of a peripheral structure of an ink jet recording apparatus to which the present invention is applied. This apparatus includes a carriage 3 on which an ink cartridge 2 is mounted and a recording head 1 is attached.
[0025]
The carriage 3 is connected to a stepping motor 5 via a timing belt 4 and is guided by a guide bar 6 to reciprocate in the paper width direction (main scanning direction) of the recording paper 7. As shown in FIG. 2, the carriage 3 has a box shape that opens to the top, and is attached so that the nozzle surface of the recording head 1 is exposed on the surface facing the recording paper 7 (the lower surface in this example). The ink cartridge 2 is accommodated. A lid member 25 is attached to the upper end portion of the carriage 3 to hold the upper portion of the ink cartridge 2 in a state where the ink cartridge 2 is accommodated and to cover the opened upper portion of the carriage 3.
[0026]
Then, ink is supplied from the ink cartridge 2 to the recording head 1 and ink droplets are ejected onto the upper surface of the recording paper 7 while moving the carriage 3 so that images and characters are printed on the recording paper 7 in a dot matrix. Yes. In FIG. 1, reference numeral 8 denotes a cap that seals the nozzle openings of the recording head 1 during a printing pause, and reference numeral 9 denotes a suction pump that applies a negative pressure to the cap 8. In FIG. 2, reference numeral 26 denotes a guide hole through which the guide bar 6 is inserted.
[0027]
The cap 8 is made of an elastic material such as an elastomer and is disposed in a non-printing area (home position) at the end of the recording apparatus. The cap 8 prevents the nozzle from drying as much as possible by sealing the nozzle opening of the recording head 1 during a printing pause, and forcibly discharges ink from the nozzle of the recording head 1 to increase the ink discharge capability. Part of the recovery mechanism to be recovered.
[0028]
As shown in FIG. 3, the recovery mechanism includes a cap (blocking member) 8 in which a concave portion serving as a negative pressure generating space 64 is formed so as to face the nozzle 11 forming surface of the nozzle plate 16, and the negative pressure generating space 64. An ink discharge path 66 communicating with the ink discharge path 66, and a suction pump 9 connected to the ink discharge path 66. In FIG. 3, reference numeral 65 denotes an ink discharge port that allows the ink discharge path 66 and the negative pressure generating space 64 to communicate with each other.
[0029]
In the recovery mechanism, the cap 8 is moved upward to come into contact with the nozzle surface with the recording head 1 moved to the home position, and the nozzle 11 is sealed through the negative pressure generating space 64. By operating the suction pump 9, a negative pressure is applied in the negative pressure generation space 64 of the cap 8, and the ink in the recording head 1 is forcibly sucked and discharged from the nozzle 11, and the viscosity in the vicinity of the nozzle 11 is increased. Ink is discharged to recover the ink ejection capability.
[0030]
FIG. 4 shows an example of the basic structure of the head main body 10 used for the recording head 1. The head body 10 is configured by joining a flow path unit 13 in which a nozzle 11 and a pressure generating chamber 12 are formed, and a head case 15 in which a piezoelectric vibrator 14 is accommodated.
[0031]
The flow path unit 13 is formed with a flow path in which spaces corresponding to the nozzle plate 16 in which the nozzles 11 are formed, the ink chamber 17 common to the pressure generation chamber 12 and the ink supply path 18 that communicates these are formed. A plate 19 and a vibration plate 20 that closes the opening of the pressure generating chamber 12 are laminated.
[0032]
The piezoelectric vibrator 14 is a so-called longitudinal vibration mode vibrator that contracts in the longitudinal direction in a charged state upon input of a drive signal and extends in the longitudinal direction in the process of discharging from the charged state. The piezoelectric vibrator 14 is fixed to the base 21 with the other end fixed to the island 20 </ b> A of the diaphragm 20 that forms a part of the pressure generating chamber 12.
[0033]
In the head case 15, a head flow path 24 for introducing the ink of the ink cartridge 2 into the ink chamber 17 is formed at a portion corresponding to the ink chamber 17.
[0034]
In the head body 10, the pressure generation chamber 12 expands and contracts in response to the contraction / extension of the piezoelectric vibrator 14, and ink suction and ink droplet discharge are performed by pressure fluctuations in the pressure generation chamber 12. It has become. In FIG. 4, reference numeral 22 denotes a flexible cable for inputting a drive signal to the piezoelectric vibrator 14.
[0035]
In the head body 10, the piezoelectric vibrator 14, the pressure generation chamber 12, and the nozzle 11 are arranged in a direction perpendicular to the paper surface in FIG. 4, and the nozzle plate 16 has two rows as shown in FIG. A nozzle row 23 is formed.
[0036]
One of the nozzle arrays 23 is a black nozzle array 23 (K) from which black ink is ejected, and the other is divided into three nozzle groups 23 (Y), (M), and (C). The yellow, magenta, and cyan inks are ejected from the nozzle groups 23 (Y), (M), and (C), respectively. In this example, the number of nozzles constituting the nozzle group 23 (Y) (M) (C) that discharges yellow, magenta, and cyan inks is set to 1/3 of the number of nozzles that constitute the black nozzle row 23K. Yes.
[0037]
In FIG. 5, 17K is an ink chamber for black ink, and 17Y, 17M, and 17C are ink chambers for yellow, magenta, and cyan ink, respectively. 24K is a head flow path for introducing ink into the ink chamber 17K for black ink, and 24Y, 24M, and 24C are head flow paths for introducing ink into the ink chambers 17Y, 17M, and 17C for yellow, magenta, and cyan ink, respectively. It is.
[0038]
FIG. 6 is a cross-sectional view showing the recording head 1 in which the head body 10 is used. The recording head 1 includes a head main body 10 and a head holder 32 to which the head main body 10 is attached.
[0039]
The head holder 32 is provided with a plurality of (four in this example) ink supply needles 27K, 27Y, 27M, and 27C that are inserted into the ink cartridge 2 and receive ink supply. In this example, the ink supply needles 27K, 27Y, 27M, and 27C receive black, yellow, magenta, and cyan inks, respectively.
[0040]
Each of the ink supply needles 27K, 27Y, 27M, and 27C is hollow and has an ink hole 34 formed at the tip. A filter 31 for filtering the ink supplied from the ink cartridge 2 is provided at the root of each of the ink supply needles 27K, 27Y, 27M, and 27C. The head holder 32 communicates with the ink supply needles 27K, 27Y, 27M, and 27C, and communicates with the head flow paths 24K, 24Y, 24M, and 24C of the head body 10 and the ink in the ink cartridge 2. Holder channels 30K, 30Y, 30M, and 30C are formed.
[0041]
Between the head holder 32 and the head main body 10, seals for sealing each flow path at a connection portion between each of the holder flow paths 30K, 30Y, 30M, and 30C and the head flow paths 24K, 24Y, 24M, and 24C. A plate 28 is provided. In the seal plate 28, as shown in FIG. 7, the holder channels 30K, 30Y, 30M, 30C and the portions corresponding to the openings of the head channels 24K, 24Y, 24M, 24C are provided in the holder channels 30K. , 30Y, 30M, 30C and the communication channels 33K, 33Y, 33M, 33C for communicating the head flow paths 24K, 24Y, 24M, 24C. The circumference of each of the communication ports 33K, 33Y, 33M, and 33C is formed of an elastic material 29.
[0042]
Here, as described above, in this example, the number of nozzles constituting the nozzle group 23 (Y) (M) (C) that discharges yellow, magenta, and cyan inks constitutes the black nozzle row 23 (K). The number of nozzles to be set is set to 1/3. In this recording head 1, according to the number of nozzles, the holder channels 30Y, 30M, 30C through which yellow, magenta, and cyan ink circulate, the communication ports 33Y, 33M, 33C, and the head channels 24Y, 24M, 24C are provided. The opening area is set to be 1/3 of the opening area of the holder channel 30K, the communication port 33K, and the head channel 24K through which the black ink flows.
[0043]
As described above, in the recording apparatus, by reducing the opening area of the flow path for yellow, magenta, and cyan inks with a small number of communicating nozzles, the ink flow rate per unit area during cleaning is increased. The difference in flow velocity with the black ink flow path having a large number of communicating nozzles is substantially uniform. Therefore, the air bubbles caught around the communication ports 33K, 33Y, 33M, and 33C of the seal plate 28 provided at the connection location between the holder flow paths 30K, 30Y, 30M, and 30C and the head flow paths 24K, 24Y, 24M, and 24C. Can be removed almost reliably, and unnecessarily wasteful ink can be prevented from being discharged from the black ink flow path having a large number of communicating nozzles.
[0044]
Next, a second embodiment of the present invention will be described. This recording apparatus shows an example in which the present invention is applied to a recording head using a flexural vibration mode piezoelectric vibrator.
[0045]
8 and 9 are diagrams showing an example of the basic structure of the recording head. This recording head includes an actuator unit 62 in which a plurality of pressure generating chambers 42 are formed, and a flow path unit 63 in which nozzles 43 and ink chambers 44 are formed and adhered to the lower surface of the actuator unit 62. The actuator unit 62 has a piezoelectric vibrator 46 attached to the upper surface thereof, and generates pressure in the pressure generating chamber 42 by the vibration of the piezoelectric vibrator 46 to eject ink droplets from the nozzles 43.
[0046]
The actuator unit 62 includes a pressure generating chamber forming plate 40 in which a space for forming the pressure generating chamber 42 is formed, and a vibration plate 41 that is positioned on the upper surface of the pressure generating chamber forming plate 40 and closes the upper surface opening of the space. And a lid member 35 positioned on the lower surface of the pressure generating chamber forming plate 40. The lid member 35 is formed with a supply port 39 that allows the ink chamber 44 and the pressure generating chamber 42 to communicate with each other, and a communication passage 45 that allows the pressure generating chamber 42 and the nozzle 43 to communicate with each other.
[0047]
The flow path unit 63 includes a flow path forming plate 36 in which four spaces forming the ink chamber 44 are formed, a nozzle plate 37 in which a nozzle 43 is perforated and positioned on the lower surface of the flow path forming plate 36, The supply port plate 38 is located on the upper surface of the flow path forming plate 36. A communication passage 45 communicating with the nozzle 43 is formed in the flow path forming plate 36. Further, the supply port plate 38 is provided with a supply port 39 for supplying ink from the ink chamber 44 to the pressure generation chamber 42, and a communication passage 45 for communicating the pressure generation chamber 42 and the nozzle 43 is formed. ing.
[0048]
A lower electrode 47B is formed on the upper surface of the diaphragm 41 of the actuator unit 62 (not shown in FIG. 8). A plate-like piezoelectric vibrator 46 is formed on the upper surface of the lower electrode 47B, and an upper electrode 47A (not shown in FIG. 8) is formed on the upper surface of the piezoelectric vibrator 46. A flexible circuit board 47C is stretched on the upper surface of the actuator unit 62.
[0049]
In this example, two nozzle rows are provided, one is a black nozzle row from which black ink (K) is ejected, and the other is divided into three nozzle groups. (Y), magenta (M), and cyan (C) ink are ejected. In this example, the number of nozzles constituting the nozzle group for ejecting yellow, magenta, and cyan inks is set to 1/3 of the number of nozzles constituting the black nozzle row.
[0050]
On the other hand, the ink chamber 44 in which the ink supplied to each pressure generating chamber 42 is stored is formed in a long hole shape corresponding to the nozzle row. In this example, the ink chamber 44 (K) for black ink communicating with one nozzle row and the yellow, magenta, and cyan colors respectively communicating with three nozzle groups in which the other nozzle row is divided into blocks. Ink chambers 44 (Y), (M), and (C) are formed. The supply port plate 38 is formed with ink supply ports (head flow paths) 49 for supplying ink to the ink chambers 44 (K) (Y) (M) (C).
[0051]
In the recording head, as shown in FIG. 10, the ink supply port 49 is connected to the holder flow path 50 of the head holder 32 so as to introduce ink from an ink cartridge (not shown) into the ink chamber 44. It has become.
[0052]
Here, as described above, in this example, the number of nozzles constituting the nozzle group for discharging yellow, magenta, and cyan inks is set to 1/3 of the number of nozzles constituting the black nozzle row. In this recording head, according to the number of nozzles, the opening area of the holder flow path 50YMC and the ink supply port 49YMC through which yellow, magenta, and cyan ink circulate is the holder flow path 50K and the ink supply port through which black ink flows. It is set to be 1/3 of the opening area of 49K.
[0053]
In this example, the head holder 32 and the head main body are bonded via an adhesive layer 48, and the adhesive layer 48 functions as a seal plate that seals the connection between the ink supply port 49 and the holder channel 50.
[0054]
In each of the above embodiments, the device using the piezoelectric vibrators 14 and 46 is shown as an element that pressurizes the pressure generating chamber 12, but the present invention is not limited to this, and the device that pressurizes the pressure generating chamber 12 is used. The present invention can also be applied to a recording apparatus equipped with a head body using a heating element that heats and vaporizes ink inside. In this case, the same effect can be obtained.
[0055]
Also, in each of the above embodiments, an example has been described in which there are two nozzle rows, one of which ejects one color ink and the other ejects three colors. The present invention is not limited to this, and the present invention can also be applied to a case where there are three or more nozzle rows and one color ink is ejected from two or more rows. Further, the present invention can be applied not only to an apparatus that ejects four colors of ink, but also to an apparatus that ejects five or more colors of ink.
[0056]
【The invention's effect】
As described above, according to the ink jet recording apparatus of the present invention, in the flow path with a small number of communicating nozzles, the opening area of the flow path is small, so that the ink flow rate per unit area during cleaning increases. The difference in flow velocity from the flow path having a large number of communicating nozzles is reduced. Therefore, the bubbles caught at the connection portion between the holder flow path and the head flow path are almost surely sucked and removed, and it is also possible to prevent unnecessary ink from being discharged from the flow path having a large number of communicating nozzles. .
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of an ink jet recording apparatus of the present invention.
FIG. 2 is an exploded perspective view showing a main part of the ink jet recording apparatus.
FIG. 3 is an explanatory diagram showing a configuration of a recovery mechanism including a cap.
FIG. 4 is a cross-sectional view showing a head body used in the ink jet recording apparatus.
FIG. 5 is a view of the head body as viewed from the nozzle plate side.
FIG. 6 is a cross-sectional view showing a recording head.
FIG. 7 is a plan view showing a seal plate.
FIG. 8 is an exploded perspective view showing a recording head used in a second embodiment of the ink jet recording apparatus of the present invention.
FIG. 9 is a cross-sectional view of the recording head.
FIG. 10 is a cross-sectional view of the recording head.
FIG. 11 is a cross-sectional view showing a conventional recording head.
FIG. 12 is a plan view showing a seal plate in the conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Recording head 2 Ink cartridge 3 Carriage 4 Timing belt 5 Stepping motor 6 Guide bar 7 Recording paper 8 Cap 9 Suction pump 10 Head main body 11 Nozzle 12 Pressure generating chamber 13 Flow path unit 14 Piezoelectric vibrator 15 Head case 16 Nozzle plate 17 Ink Chamber 18 Ink supply path 19 Flow path forming plate 20 Vibration plate 20A Island portion 21 Base 22 Flexible cable 23 Nozzle rows 24K, 24Y, 24M, 24C Head flow path 25 Cover member 26 Guide hole 27 Ink supply needle 28 Seal plate 29 Elasticity Material 30K, 30Y, 30M, 30C Holder flow path 31 Filter 32 Head holder 33K, 33Y, 33M, 33C Communication port 34 Ink hole 35 Lid member 36 Flow path forming plate 37 Nozzle plate 38 Supply port plate 39 Supply port 40 Pressure generating chamber Formation plate 41 Diaphragm 42 Pressure generating chamber 43 Nozzle 44 Ink chamber 45 Communication path 46 Piezoelectric vibrator 47A Upper electrode 47B Lower electrode 47C Flexible circuit plate 48 Adhesive layer 49 Ink supply port 50 Holder channel 51 Head body 52 Holder channel 53 Head holder 54 Ink supply needle 55 Filter 56 Nozzle plate 57 Reservoir 58 Head flow path 59 Seal plate 60 Communication port 61 Nozzle 62 Actuator unit 63 Flow path unit 64 Negative pressure generating space 65 Ink discharge port 66 Ink discharge path

Claims (8)

  A head body having a plurality of nozzles for ejecting ink droplets and a plurality of head flow paths communicating with the nozzles, a suction means for sucking ink from the head, and a plurality of holder streams for guiding ink in the ink tank to each head flow path A head holder in which a channel is formed, at least two of the head channels have different numbers of nozzles, and the opening area of the channel at the connection between the holder channel and the head channel is the channel. An ink jet recording apparatus having a positive correlation with the number of communicating nozzles.   A seal member that seals the holder flow path and the head flow path is provided between the head holder and the head body, and a communication port that connects the holder flow path and the head flow path is formed in the seal member. 2. The ink jet recording apparatus according to claim 1, wherein the opening area has a positive correlation with the number of nozzles communicating with the flow path.   3. The ink jet recording apparatus according to claim 2, wherein the seal member is a seal plate provided between the head holder and the head main body, and at least a communication port portion is formed of an elastic material.   3. The ink jet recording apparatus according to claim 2, wherein the seal member is an adhesive layer formed between the head holder and the head main body.   The connection area between the holder flow path and the head flow path has at least one of the opening area of the holder flow path and the head flow path having a positive correlation with the number of nozzles communicating with the flow path. An ink jet recording apparatus according to claim 1.   When the number of nozzles communicating with the flow path is 1 / N of the other flow paths, the opening area is set to be 1 / N of the other flow paths, and the flow velocity of the portion of the opening area is substantially equal. The ink jet recording apparatus according to any one of claims 1 to 5.   The head main body is provided with at least two nozzle rows, and has a nozzle row communicating with one flow path, and a nozzle row divided into blocks of n nozzle groups respectively communicating with n flow paths. The ink jet recording apparatus according to claim 1.   The ink jet recording apparatus according to claim 1, wherein different types of ink are ejected from nozzles communicating with each flow path.

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