JP2013230655A - Liquid ejection head unit and liquid ejecting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid ejection head unit and a liquid ejecting apparatus, capable of performing high precision and high image quality printing by suppressing variation in ink discharge characteristics of liquid ejection head accompanying a change in temperature.SOLUTION: A liquid ejection head unit comprises: a plurality of liquid ejection heads 10a-10f having a nozzle row 14 in which nozzle openings for ejecting liquid are arranged; and a plurality of temperature detection means 9a-9f for measuring ambient temperatures around the liquid ejection heads 10a-10f. The number of the temperature detection means 9a-9f is equal to or larger than that of the liquid ejection heads 10a-10f.

Description

  The present invention relates to a liquid ejecting head unit including a liquid ejecting head that ejects liquid from a nozzle opening and a liquid ejecting apparatus.

  A liquid ejecting apparatus typified by an ink jet recording apparatus includes a liquid ejecting head unit provided with a plurality of liquid ejecting heads that eject a liquid such as ink. The viscosity of the liquid such as ink ejected from these liquid ejecting heads varies depending on the temperature. In particular, when a high-viscosity liquid is ejected, the viscosity varies greatly due to the temperature variation. When discharging such a liquid, a method of heating the liquid or changing the drive waveform of the liquid ejecting head based on the temperature of the liquid ejecting head has been proposed in order to perform the discharge in accordance with the viscosity characteristics. (For example, refer to Patent Documents 1 and 2).

JP 2010-023257 A JP 2011-183727 A

  However, even if control is performed based on the temperature of the liquid ejecting head as described above, there is a problem that high-speed and high-quality image printing cannot be realized in the liquid ejecting head that is becoming longer in recent years.

  SUMMARY An advantage of some aspects of the invention is that it provides a liquid ejecting head unit and a liquid ejecting apparatus that can suppress variation in ink ejection characteristics of the liquid ejecting head due to temperature changes and perform high-precision and high-quality printing. And

According to an aspect of the present invention for solving the above-described problems, a plurality of liquid ejecting heads each having a nozzle row in which nozzle openings for ejecting liquid are arranged in parallel, and a plurality of temperature detecting means for measuring the ambient temperature around the liquid ejecting head. The liquid ejecting head unit is characterized in that the number of the temperature detecting means is equal to or more than the number of the liquid ejecting heads.
According to the present invention, since the drive signal is corrected in consideration of the ambient temperature around each liquid ejecting head measured by the plurality of temperature detecting means, the liquid ejection between the liquid ejecting heads due to the change in the environmental temperature. Variations in characteristics can be suppressed, and a liquid ejecting head unit having high ejection characteristics can be realized.

  Here, in the liquid ejecting head unit, the plurality of liquid ejecting heads are arranged in two rows in a staggered manner in the direction in which the nozzle openings are arranged to form one nozzle row unit in which the nozzle rows are continuous. It is preferable that one or more of the temperature detection units are disposed opposite to one liquid ejecting head at a position adjacent to the direction in which the liquid ejecting heads cross the juxtaposed direction. According to this, since the liquid ejecting heads and the temperature detecting means are respectively arranged in a staggered manner, the temperature detecting means can grasp the change in environmental temperature for each liquid ejecting head more accurately. Accordingly, the drive signal can be corrected with higher accuracy, and variations in the liquid ejection characteristics between the liquid ejecting heads can be suppressed.

  Here, in the liquid ejecting head unit, it is preferable that the temperature detecting unit is disposed between the liquid ejecting heads arranged in parallel in the two rows. According to this, since the temperature detecting means can more accurately grasp the change in the environmental temperature between the liquid ejecting heads, the drive signal can be corrected with high accuracy and the variation in the liquid ejection characteristics between the liquid ejecting heads can be suppressed. it can.

  In the liquid ejecting head unit, it is preferable that the temperature detecting unit is disposed only on one side in a direction intersecting the juxtaposed direction. According to this, since the temperature of the upstream side or the downstream side of the liquid ejecting head can be accurately grasped by the temperature detecting means, the driving that reflects the ambient temperature of each liquid ejecting head is reflected. The signal can be corrected, and variations in the liquid ejection characteristics between the liquid ejecting heads can be suppressed.

  In the liquid ejecting head unit, it is preferable that the temperature detecting unit is also disposed outside the juxtaposed direction of the liquid ejecting heads disposed at both ends of the nozzle row unit. According to this, three or more temperature detecting means are arranged around all the liquid jet heads. The correction of the drive signal based on the ambient temperature around the liquid ejecting head measured by the plurality of temperature detecting units is more accurate and can suppress variations in the liquid ejection characteristics between the liquid ejecting heads.

  In the liquid ejecting head unit, it is preferable that the temperature detecting unit is disposed between the center lines of the liquid ejecting heads in the respective rows along the direction in which the nozzle openings are arranged. According to this, since the temperature detecting means is provided closer to the liquid jet head facing the direction intersecting with the direction in which the nozzle openings are arranged side by side, the ambient temperature of each liquid jet head is further increased. It is possible to accurately grasp the driving signal and correct the driving signal with high accuracy.

According to another aspect of the present invention, the liquid ejecting head unit according to any one of the above, further includes a control unit that controls ejection of the liquid by the liquid ejecting head, and the control unit includes the plurality of temperature detection units. The liquid ejecting head unit corrects a driving signal for ejecting the liquid to the liquid ejecting head based on a plurality of temperature information measured by the means.
According to the present invention, since the drive signal is corrected in consideration of the ambient temperature around each liquid ejecting head measured by the plurality of temperature detecting means, the liquid ejection between the liquid ejecting heads due to the change in the environmental temperature. Variations in characteristics can be suppressed, and a liquid ejecting head unit having high ejection characteristics can be realized.

According to another aspect of the invention, there is provided a liquid ejecting apparatus including the liquid ejecting head unit described above.
According to the present invention, since the drive signal is corrected in consideration of the ambient temperature around each liquid ejecting head measured by the plurality of temperature detecting means, the liquid ejection between the liquid ejecting heads due to the change in the environmental temperature. Variation in characteristics can be suppressed, and a liquid ejecting apparatus having high ejection characteristics can be realized.

1 is a schematic perspective view of a liquid ejecting apparatus according to Embodiment 1. FIG. FIG. 3 is a schematic perspective view of the liquid ejecting head according to the first embodiment. FIG. 3 is a bottom view of the liquid jet head according to the first embodiment. FIG. 3 is a bottom view of the head unit according to the first embodiment. 6 is a bottom view of a head unit according to Embodiment 2. FIG. FIG. 6 is a bottom view of a head unit according to a third embodiment. FIG. 6 is a bottom view of a head unit according to a fourth embodiment.

Hereinafter, the present invention will be described in detail based on embodiments.
(Embodiment 1)
1 is a schematic perspective view of an ink jet recording apparatus that is an example of a liquid ejecting apparatus according to Embodiment 1 of the invention, FIG. 2 is a schematic perspective view of a liquid ejecting head, and FIG. 3 is a liquid ejecting apparatus. FIG. 4 is a bottom view of the head, and FIG. 4 is a bottom view of the head unit. Hereinafter, a liquid ejecting apparatus and a head unit according to an embodiment of the invention will be described with reference to the drawings.

  As shown in FIG. 1, an ink jet recording apparatus 1 which is an example of a liquid ejecting apparatus according to this embodiment is an ejected medium with an ink jet recording head 10 (hereinafter referred to as “recording head”) fixed thereto. This is a so-called line type recording apparatus that performs printing by conveying a recording sheet S such as paper. The ink jet recording apparatus 1 includes an apparatus main body 2, a head unit 3 that is fixed to the apparatus main body 2 and includes a plurality of recording heads 10, a conveyance unit 4 that conveys a recording sheet S, and a support unit 5. .

  The head unit 3 includes a plurality of recording heads 10 a to 10 f on a plate-like holding member 6. As shown in FIG. 1, the plurality of recording heads 10a to 10f are arranged in two rows in the direction in which the nozzle openings are arranged, and the recording heads 10a to 10f in each row are arranged in the direction in which the nozzle openings are arranged. , Ie, the direction in which the recording sheet S is conveyed (hereinafter referred to as the “conveying direction of the recording sheet S”), the positions of the recording heads 10 a to 10 in each row are staggered. The side-by-side direction of 10f, that is, the end portion in the longitudinal direction is arranged so as to partially overlap with the side-by-side direction of the nozzle openings. In the present embodiment, such an arrangement is called a staggered arrangement.

  On the other hand, each of the recording heads 10a to 10f includes two nozzle rows 14a and 14b each having a plurality of nozzle openings arranged in parallel on one end surface. That is, in this embodiment, two nozzle rows 14a and 14b are formed side by side in the conveyance direction of the recording sheet S. However, the nozzle openings 11 of one nozzle row 14a and the nozzle openings of the other nozzle row 14b are formed. 11 is formed in a state shifted by a half pitch, and the nozzle openings 11 of the nozzle row 14a and the nozzle openings 11 of the nozzle row 14b eject the same type of liquid. In such a case, two rows of nozzles are ejected. It is assumed that one nozzle row 14 is substantially formed by the rows 14a and 14b. In the present invention, this substantially aligned nozzle row 14 is referred to as a nozzle row. Thereby, the resolution can be doubled. The rows of the nozzle openings 11 may be configured such that three or more rows substantially constitute one row. Of course, only one nozzle row may be provided. In addition, two or more nozzle rows may be provided, and each nozzle row may eject a different kind of liquid. In this case, a plurality of nozzle rows are provided.

  Further, on the head unit 3, among the recording heads 10 arranged in two rows in a staggered manner, the end portion of the nozzle row 14 provided in the recording head 10 in one row and the recording head 10 in the other row are arranged. The end of the provided nozzle row is arranged so that a part thereof overlaps in the direction in which the nozzle openings 11 are arranged side by side. Thereby, the nozzle rows 14 of all the recording heads 10 on the head unit 3 are made continuous to form a nozzle row unit that forms the maximum print width as a whole.

  Further, although not shown in the drawing, the ink storage means such as an ink tank or an ink cartridge in which ink is stored is connected to each of the recording heads 10a to 10f of the head unit 3 so as to be able to supply ink. For example, the ink storage unit may be held on the head unit 3 or may be held at a position different from the head unit 3 in the apparatus main body 2.

  In the vicinity of the recording heads 10a to 10f, thermistors 9a to 9f, which are temperature detecting means for measuring the ambient temperature around the recording head 10, are provided. Note that the temperature detection means may be a temperature sensor such as a thermoelectric resistor or a thermocouple. The thermistors 9a to 9f are arranged in a zigzag shape adjacent to the direction in which the nozzle openings 11 of the recording heads 10a to 10f are arranged, that is, in the present embodiment, adjacent to the conveyance direction of the recording sheets S. It is provided on the other side of the column. That is, the thermistors 9b to 9e are disposed between the recording heads adjacent to each other in the direction in which the nozzle openings 11 of the two rows of the recording heads 10a to 10f are arranged in a staggered manner, and the thermistors 9a and 9f. Is provided outside the nozzle openings 11 of the recording heads 10b and 10e in the juxtaposition direction and adjacent to the recording heads 10a and 10f. Although not particularly illustrated, each of the recording heads 10a to 10f includes a temperature sensor that detects the liquid temperature in each recording head, for example, a thermistor. Information on these thermistors and the above-described thermistors 9a to 9f is sent to a control device configured with a CPU, a memory, and the like provided in the ink jet recording apparatus 1.

  The conveyance unit 4 includes a first conveyance unit 7 and a second conveyance unit 8 provided on both sides of the recording unit S in the conveyance direction with respect to the head unit 3.

  The 1st conveyance means 7 is comprised by the driving roller 7a, the driven roller 7b, and the conveyance belt 7c wound around these driving roller 7a and the driven roller 7b. Similarly to the first transport unit 7, the second transport unit 8 includes a driving roller 8a, a driven roller 8b, and a transport belt 8c.

  Driving means such as a driving motor (not shown) are connected to the driving rollers 7a and 8a of the first conveying means 7 and the second conveying means 8, respectively. The conveyance belts 7c and 8c are driven to rotate by the driving force of the driving unit, whereby the recording sheet S is conveyed from one side to the other along the conveyance direction. That is, the recording sheet S is conveyed from one side to the head unit 3, and the recording sheet S on which ink is ejected is conveyed to the other side. The one side is also called the upstream side, and the other side is also called the downstream side.

  The support 5 is made of a metal or resin having a rectangular cross section provided between the first transport unit 7 and the second transport unit 8 so as to face the head unit 3. The support unit 5 is for supporting the recording sheet S conveyed by the first conveying unit 7 and the second conveying unit 8 at a position facing the head unit 3. In addition, the support unit 5 may be provided with a heating unit for drying the ejected ink, a heating unit for preheating the recording sheet S, and a sensor for measuring these temperatures.

  As shown in FIGS. 2 and 3, the recording head 10 of the present embodiment is referred to as a liquid jet head main body 12 (hereinafter referred to as “head main body”) in which a nozzle opening 11 is provided on one end surface (droplet discharge surface 18). ) And a flow path member 13 fixed to the surface of the head main body 12 opposite to the nozzle opening 11.

  In addition, although not particularly illustrated, the head main body 12 discharges ink from the nozzle opening by generating a pressure change in the pressure generating chamber constituting a part of the flow path communicating with the nozzle opening 11 and the pressure generating chamber. Pressure generating means is provided.

  The pressure generating means is not particularly limited. For example, the pressure generating means uses a piezoelectric element in which a piezoelectric material exhibiting an electromechanical conversion function is sandwiched between two electrodes, or a heating element is disposed in the pressure generating chamber to generate heat from the heating element. In which droplets are ejected from the nozzle opening 11 by bubbles generated in the nozzle, or in which static electricity is generated between the diaphragm and the electrode, and the diaphragm is deformed by electrostatic force to eject droplets from the nozzle opening 11 Etc. can be used.

  The flow path member 13 is fixed to a surface of the head main body 12 opposite to the nozzle opening 11 and supplies ink from the outside to the head main body 12 or discharges ink from the head main body 12 to the outside. .

  On the surface of the flow path member 13 opposite to the surface fixed to the head body 12, a liquid flow path port 15 to which an internal flow path is opened and an external flow path is connected, a print signal from the outside, and the like And a connector 16 to which the electrical signal is supplied.

  Of the two liquid flow path openings 15 provided in the flow path member 13, one liquid flow path opening 15 functions as a liquid supply opening, and the other liquid flow path opening 15 allows the ink inside the recording head 10 to be exposed to the outside. Functions as a liquid outlet for discharging. The flow path provided in the flow path member 13 is configured to supply ink from one liquid supply port to the nozzle row 14 so that the ink is discharged from the nozzle row 14 to the outside via the other liquid discharge port. It is configured.

  Note that both of the two liquid channel ports 15 may function as liquid supply ports. In this case, for example, the flow path inside the recording head 10 is configured so that the two liquid flow path ports 15 communicate with the nozzle row 14. Of course, the number of liquid flow path ports 15 and the number of nozzle rows 14 are not limited to those described above, and the proper use of the liquid flow path ports 15 as liquid supply ports or liquid discharge ports is also limited to those described above. It is not something.

  The head body 12 is provided with a cover head 30 provided so as to cover the peripheral edge of the droplet discharge surface 18.

  In addition, although the ink jet recording apparatus 1 described above shows only one head unit 3 for the sake of illustration, the ink jet recording apparatus 1 discharges a plurality of types of liquids, for example, when performing color printing with a plurality of colors of ink. Needless to say, a plurality of head units 3 are arranged side by side.

  In addition, the ink jet recording apparatus 1 according to the present embodiment is provided with a control unit that corrects the drive signal according to the environmental temperature of the recording heads 10a to 10f. This control means considers the ambient temperature of each of the plurality of recording heads 10a to 10f measured by the plurality of temperature detecting means 9a to 9f together with temperature information based on the temperature of the liquid in the recording head 10, and the recording head. A driving condition suitable for ejection is obtained every 10th, and the driving signal is corrected so that the optimum driving condition is obtained for each recording head 10.

  Since the ambient temperature around the recording heads 10a to 10f always varies under the influence of the environmental temperature, the liquid immediately before being ejected from the nozzle openings 11 of the recording heads 10a to 10f is more ambient than the temperature inside the recording head. The influence of ambient temperature is large. Therefore, it is not sufficient to correct based on only the temperature information inside the recording heads 10a to 10f as in the prior art, and the driving conditions are corrected in consideration of the ambient temperature around each recording head 10a to 10f. I have to. The ambient temperature around each of the recording heads 10a to 10f is the temperature rise due to the driving of the recording heads 10a to 10f, the temperature when the ink dries, the temperature of the heating means for drying the ink, Since it fluctuates under the influence of various environmental temperatures such as the temperature of the heated recording sheet S and room temperature, it is necessary to make a local determination for each of the recording heads 10a to 10f. For this reason, in this embodiment, the thermistors 9a to 9f are provided corresponding to the respective recording heads 10a to 10f, and the ambient temperatures around the respective recording heads 10a to 10f are respectively measured. In the present embodiment, the thermistors 9a to 9f that are the same in number as the number of the recording heads 10a to 10f are provided. Therefore, the ambient temperature around the recording head 10a can be calculated from the temperature information of the thermistor 9a. From the thermistor 9b, the thermistors 9a to 9f can be associated with the recording heads 10a to 10f on a one-to-one basis to obtain the ambient temperature around the recording heads 10a to 10f. Of course, just because the number of thermistors 9a to 9f equivalent to the recording heads 10a to 10f is provided in this way, it is not necessary to obtain the ambient temperature in a one-to-one correspondence. The ambient atmosphere temperature is obtained by referring to not only the temperature information of the thermistor 9a but also the temperature information of the thermistor 9b, and the ambient temperature of the recording head 10b is not only the thermistor 9b but also the temperature information of the thermistors 9a and 9c. As described above, the ambient temperature around the recording heads 10a to 10f may be acquired from temperature information of a plurality of thermistors selected from the thermistors 9a to 9f. In this case, when the ambient temperature is acquired from the temperature information of a plurality of thermistors, the ambient temperature may be acquired by weighting each thermistor.

  For example, when the ambient temperature around each of the recording heads 10a to 10f is calculated based on the temperature information of a plurality of thermistors, a predetermined contribution degree is determined in advance for the plurality of thermistors, for example, if the ink temperature change is affected. It may be calculated by considering the contribution by increasing the contribution of the temperature measured in the vicinity of the recording head involved in printing, etc., or by using parameters etc. And a function of the distance from each recording head 10 and the like. Alternatively, the average value of the temperature variation between the thermistors may be calculated as a reference. Thus, the calculation method of the ambient temperature around each of the recording heads 10a to 10f is not particularly limited.

  In any case, when the environmental temperature changes, on the head unit 3 having a plurality of recording heads 10a to 10f, the ambient temperature at the center of the head unit 3 and the ambient temperature at both ends of the head unit 3 are predetermined. Therefore, as described above, it is effective to acquire the ambient temperature for each of the recording heads 10a to 10f, and the difference in print quality based on such a temperature difference is obtained. This can be solved by correcting the driving conditions. In particular, in a recording head unit that is becoming longer in recent years, it is important to suppress variations in ink ejection characteristics between the recording heads 10, and as described above, a drive signal is accurately output for each of the recording heads 10 a to 10 f. It is important to correct. In the present invention, by correcting the drive signal as described above, it is possible to suppress a variation in liquid ejection characteristics between the recording heads 10a to 10f due to a change in the environmental temperature, and to realize a recording head unit that can perform high-precision and high-quality printing. .

(Embodiment 2)
FIG. 5 is a bottom view of the head unit according to the second embodiment. As shown in FIG. 5, the head unit 3 includes six recording heads 10a to 10f and eight thermistors 9a to 9h. The recording heads 10a to 10f are arranged in two rows in a staggered manner along the direction in which the nozzle openings 11 are arranged, as in the first embodiment. On the other hand, the thermistors 9a to 9f are arranged in two rows in a staggered manner in a one-to-one relationship with the recording heads 10a to 10f in the conveyance direction of the recording sheet S as in the first embodiment. Thermistors 9g and 9h are arranged outside the recording heads 10a and 10f at both ends with respect to the direction in which the openings 11 are arranged side by side.

  As a result, in each of the recording heads 10a to 10f, the thermistors 9a to 9f are arranged one by one on the side of the recording heads 10a to 10f in the direction intersecting with the juxtaposed direction of the nozzle openings 11, and Thermistors 9g and 9h are disposed outside the recording heads 10a and 10f. Accordingly, three thermistors are arranged around each of the recording heads 10a to 10f, and the ambient temperature around each of the recording heads 10a to 10f is based on the temperature information of each of the three thermistors. The driving signal can be corrected with higher accuracy. Of course, only for the recording heads 10a and 10f arranged at both ends where the influence of the environmental temperature tends to be large, the ambient atmosphere temperature is calculated based on the temperature information of the three thermistors. The ambient atmospheric temperature may be calculated by a thermistor.

(Embodiment 3)
FIG. 6 is a bottom view of the head unit according to the third embodiment. As shown in FIG. 6, the recording heads 10 a to 10 f are arranged in two rows in a staggered manner along the direction in which the nozzle openings 11 are arranged, as in the first embodiment. On the other hand, the thermistors 9a to 9f are respectively arranged on one side of the recording heads 10a to 10f, in the present embodiment, on the downstream side in the transport direction with respect to the transport direction of the recording sheet S.

  Such a thermistor arrangement is effective when the recording sheet S is preheated or heated for drying after printing. That is, each of the recording heads 10a to 10f is easily affected by the temperature of the recording sheet S being conveyed, but the thermistors 9a to 9f are provided in a certain direction of the conveying direction of the recording heads 10a to 10f. ˜9f can accurately grasp the ambient temperature around the recording heads 10a to 10f, and in this embodiment, the downstream temperature. Such correction of the drive signal reflecting the ambient temperature around the recording head is highly accurate, and variations in ink ejection characteristics between the recording heads 10a to 10f can be suppressed.

(Embodiment 4)
FIG. 7 is a bottom view of the head unit according to the fourth embodiment. In the head unit 3 according to the fourth embodiment, as in the first embodiment, the recording heads 10 a to 10 f and the thermistors 9 a to 9 f face each other one-on-one, and each is along the direction in which the nozzle openings 11 are juxtaposed. Although thermistors 9a to 9f according to the fourth embodiment are arranged in two rows in a staggered manner, the thermistors 9a to 9f are provided close to the opposing recording heads 10a to 10f as compared with the first embodiment, and the nozzle openings 11 are arranged in parallel. Are arranged between the center lines of the recording heads in each row (see the one-dot chain line in FIG. 7).

  The thermistors 9a to 9f arranged in this way are provided close to the opposing recording heads 10a to 10f, so that the ambient temperature around each of the recording heads 10a to 10f can be grasped more accurately. Variations between measurement temperatures can be reduced.

  Such correction of the drive signal based on the measured temperature with small variation is more accurate, and variation in ink ejection characteristics between the recording heads 10a to 10f can be suppressed.

(Other embodiments)
The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the gist of the present invention.

  In the ink jet recording apparatus 1 of the above-described embodiment, a so-called line recording apparatus is illustrated in which the ink jet recording head 10 is fixed and printing is performed simply by moving the recording sheet S such as paper. For example, the present invention may be applied to a head unit of a serial recording apparatus in which the ink jet recording head 10 is mounted on a carriage and moves in the main scanning direction and also moves the recording sheet S in the sub scanning direction. it can.

  In the above-described embodiment, the ink jet recording head has been described as an example of the liquid ejecting head. However, the present invention is widely applied to all liquid ejecting heads, and the liquid ejecting ejects a liquid other than ink. Of course, it can also be applied to the head. Other liquid ejecting heads include, for example, various recording heads used in image recording apparatuses such as printers, color material ejecting heads used in the manufacture of color filters such as liquid crystal displays, organic EL displays, and FEDs (field emission displays). Examples thereof include an electrode material ejection head used for electrode formation, a bioorganic matter ejection head used for biochip production, and the like.

DESCRIPTION OF SYMBOLS 1 Inkjet recording apparatus, 2 Recording apparatus main body, 3 Head unit, 4, 7, 8 Conveyance means, 5 Support part, 6 Holding member, 9a-9h Thermistor, 10a-10f Inkjet recording head, 11 Nozzle opening, 12 Liquid Ejection head body, 13 flow path member, 14 nozzle row, 15 liquid flow path port, 16 connector, 18 droplet discharge surface

Claims (8)

A plurality of liquid ejecting heads having nozzle rows in which nozzle openings for ejecting liquid are arranged in parallel;
A plurality of temperature detecting means for measuring an ambient temperature around the liquid jet head;
Comprising
The liquid ejecting head unit is characterized in that the number of the temperature detecting units is equal to or more than the number of the liquid ejecting heads. The liquid ejecting head unit according to claim 1,
The plurality of liquid ejecting heads are arranged in two rows in a staggered manner in the direction in which the nozzle openings are arranged, and form one nozzle row unit in which the nozzle rows are continuous.
One or more of the temperature detecting means is disposed opposite to one liquid ejecting head at a position adjacent to the direction in which the liquid ejecting heads cross the juxtaposed direction. . The liquid ejecting head unit according to claim 2,
The liquid ejecting head unit, wherein the temperature detecting means is disposed between the liquid ejecting heads arranged in parallel in the two rows. The liquid ejecting head unit according to claim 2,
The liquid ejecting head unit according to claim 1, wherein the temperature detecting means is disposed only on one side in a direction crossing the juxtaposed direction. In the liquid jet head unit according to any one of claims 2 to 4,
The liquid ejecting head unit, wherein the temperature detecting unit is also disposed outside the juxtaposed direction of the liquid ejecting heads disposed at both ends of the nozzle row unit. The liquid ejecting head unit according to claim 2,
The liquid ejecting head unit, wherein the temperature detecting means is disposed between center lines of the liquid ejecting heads in each row along the direction in which the nozzle openings are arranged in parallel.   The liquid ejecting head unit according to claim 1, further comprising a control unit that controls ejection of the liquid by the liquid ejecting head, wherein the control unit is measured by the plurality of temperature detecting units. A liquid ejecting head unit that corrects a drive signal for ejecting liquid to the liquid ejecting head based on the plurality of temperature information.   A liquid ejecting apparatus comprising the liquid ejecting head unit according to claim 1.

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