JP5703856B2 - Liquid ejecting head and liquid ejecting apparatus - Google Patents

Description

The present invention relates to a liquid ejecting head and a liquid ejecting apparatus, and is particularly useful when applied to a corrosive liquid such as a solvent ink that deteriorates a flow path member through which the liquid flows.

As the liquid ejecting apparatus, for example, a plurality of pressure generating chambers that generate pressure for ejecting ink droplets by pressure generating means made of, for example, piezoelectric elements, and an ink supply path for individually supplying ink to each pressure generating chamber from a common manifold And an ink jet recording apparatus (hereinafter also referred to as a recording apparatus) including an ink jet recording head (hereinafter also referred to as a recording head) that is formed in each pressure generating chamber and includes a nozzle opening that discharges ink droplets. (For example, see Patent Document 1)
.

In such a recording apparatus, ejection energy is applied to the ink in the pressure generating chamber communicated with the nozzle corresponding to the print signal, and ink droplets are ejected from the nozzle opening to the outside, and land on a predetermined position of a medium such as paper. In such a recording apparatus, various inks are used depending on the application. Among them, solvent inks are used as inks for printing posters and the like that require weather resistance. However, this type of solvent ink has a problem of deteriorating the recording head, particularly the metal portion, over time. doing. That is, after the solvent ink is filled in the recording head, the recording head deteriorates with the lapse of time due to the action of the solvent ink, and finally causes problems such as ink leakage.

For this reason, conventionally, the recording head is periodically replaced or the recording head is replaced when printing cannot be performed due to the occurrence of ink leakage or the like.

On the other hand, an ink jet printer disclosed in Patent Document 2 has been proposed as an ink jet printer that notifies the timing of head replacement. This is a parameter that directly affects the head life, such as the elapsed time since the head was installed, the total amount of ink ejected, and the number of cleanings. It is to predict.

JP 2002-355961 A JP 2005-254708 A

By the way, in the case of describing in patent document 2, since the elapsed time from the time of head mounting is measured, this measured time does not necessarily measure the elapsed time from the time of ink filling. When considering the deterioration over time due to the solvent ink, it is important to grasp the time elapsed since the solvent ink was filled in the recording head.

In Patent Document 2, parameter information is not stored. Therefore, when a recording head once used is reattached to the recording apparatus, it is recognized as a new recording head, and the usage time of the recording head is “0”. "

Such problems are not limited to ink jet recording heads that eject ink,
This also exists in a liquid ejecting head that ejects liquid other than ink.

In view of the above-described problems of the related art, the present invention provides a method in which the liquid ejecting head is filled with liquid even when the liquid ejecting head is removed from the liquid ejecting apparatus or when the power of the liquid ejecting apparatus is shut off. It is an object of the present invention to provide a liquid ejecting head and a liquid ejecting apparatus that can continuously measure and store the time of the above, and can accurately notify the replacement timing of the liquid ejecting head.

An aspect of the present invention that solves the above-described problems is a pressure generation chamber filled with a liquid supplied from a liquid supply source via a liquid flow path, and a pressure change is generated in the liquid in the pressure generation chamber by supplying a drive signal. A liquid ejecting head main body having a pressure generating means for causing the nozzle to discharge the liquid in the pressure generating chamber as droplets in accordance with the pressure change; and the liquid mounted on the liquid ejecting head main body and the liquid with respect to the liquid flow passage A time measuring means for measuring an elapsed time from the time when the supply is detected, a storage means mounted on the liquid ejecting head main body for storing the elapsed time measured by the time measuring means, and a liquid ejecting head main body. The elapsed time mounted and stored in the storage means is compared with a preset time based on the life of the liquid flow path for the liquid, and the elapsed time Comparing means for sending a signal indicating this when the set time is exceeded, and a power source mounted on the liquid jet head body and operating the time measuring means, the storage means, and the comparing means. The liquid jet head is characterized by the following.

According to this aspect, the measurement is started at the timing of the start of liquid flow and the timekeeping information is stored in the storage unit one by one, and the power source that is the driving source for operating each unit is also independently mounted on the ejection head body. Therefore, even when the liquid ejecting head is removed from the liquid ejecting apparatus or when the power of the liquid ejecting apparatus is shut off, the time after the liquid ejecting head is filled with the liquid is continuously measured and stored. Therefore, it is possible to accurately notify the replacement timing of the liquid ejecting head.

Here, it further includes a temperature detection sensor mounted on the liquid jet head main body, and a correction unit that corrects the set time based on the temperature detected by the temperature detection sensor, and the correction unit corrects the set time. It is desirable to configure so as to. In this case, the set time representing the life can be corrected in consideration of the temperature history of the environment in which the liquid ejecting head is used, so that a signal based on the elapsed time reflecting the life can be transmitted more accurately. it can. In addition, the correction unit has a correction table in which the temperature detected by the temperature detection sensor is associated with the correction value of the set time, and can be configured to correct the set time using the correction table. .

Further, it detects that the liquid has been supplied from the liquid supply source to the liquid flow passage, and sends a signal indicating that the start of liquid flow has been detected to the time passage means when the liquid flow has been detected. It is also possible to mount liquid passing detection means on the head body. In this case, the measurement start timing is detected on the liquid jet head side by a signal indicating that the liquid flow start of the liquid flow detecting means is detected, and as a result, a predetermined measurement is automatically performed on the liquid jet head side. Can be started.

According to another aspect of the invention, the liquid ejection head that does not include the liquid passage detection unit is mounted, and the liquid passage start is detected when the liquid passage start of the liquid ejection head is detected by the control unit of the liquid ejecting apparatus. The signal indicating that is detected is sent from the control unit to the time-lapse means,
Further, when the signal indicating that the elapsed time exceeds the set time is supplied to the control unit, the control unit processes the signal indicating that the elapsed time has exceeded the set time, and the liquid The liquid ejecting head is characterized by operating display means for notifying a replacement warning of the ejecting head.

According to this aspect, the measurement of the predetermined elapsed time is started by a signal indicating the start of liquid flow to the liquid ejecting head, and when the predetermined time has elapsed after the liquid flow, the predetermined signal is transmitted from the liquid ejecting head side. Since it is sent out and a replacement warning based on this is notified, it is possible to accurately know the replacement timing of the liquid jet head. At this time, the liquid ejecting head can continuously measure and store a predetermined elapsed time even when the liquid ejecting head is removed from the liquid ejecting apparatus or when the power of the liquid ejecting apparatus is shut off. Therefore, the replacement warning appropriately corresponds to the replacement timing of the liquid jet head.

Another aspect of the present invention is equipped with a liquid jet head having the liquid flow detecting means,
When a signal representing that the elapsed time exceeds the set time is supplied to the control unit,
In the liquid ejecting head, the control unit processes a signal indicating that the elapsed time exceeds the set time and operates a display unit that notifies the replacement warning of the liquid ejecting head.

According to this aspect, the start of liquid flow, that is, the predetermined measurement start timing is detected on the liquid jet head side. Other operation modes are the same as those described above.

FIG. 2 is an exploded perspective view illustrating a schematic configuration of a recording head main body according to an embodiment. It is a top view of FIG. FIG. 3 is a cross-sectional view taken along line AA ′ in FIG. 2. It is the schematic which shows an example of the recording device which concerns on embodiment. It is a block diagram which shows the control system which concerns on embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows an ink jet recording head main body (hereinafter referred to as a recording head main body) constituting an ink jet recording head unit (hereinafter also referred to as a head unit) mounted on an ink jet recording apparatus (hereinafter also referred to as a recording apparatus) according to the present embodiment. 2 is an exploded perspective view showing a schematic configuration of FIG. 2, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a cross-sectional view taken along line AA ′ of FIG. Although not shown in FIGS. 1 to 3, the recording head main body I includes the timekeeping unit 130, the storage unit 131, the comparison unit 132, the power source 134, and the like shown in FIG. 5. These are configured integrally with the head body I. Here, the head body I will be described in detail first.

As shown in FIGS. 1 to 3, the flow path forming substrate 10 of the recording head main body I is made of a silicon single crystal substrate, and one surface thereof is made of silicon dioxide, and an elastic film 50 serving as a vibrating portion in this embodiment. Is formed. A plurality of pressure generating chambers 12 are arranged in parallel in the width direction of the flow path forming substrate 10. In addition, a communication portion 13 is formed in a region outside the longitudinal direction of the pressure generation chamber 12 of the flow path forming substrate 10, and the communication portion 13 and each pressure generation chamber 12 are provided for each pressure generation chamber 12. Communication is made via a supply path 14 and a communication path 15. The communication part 13 communicates with a manifold part 31 of the protective substrate 30 described later and constitutes a part of the manifold 100 that becomes a common ink chamber of each pressure generating chamber 12. The ink supply path 14 is formed with a narrower width than the pressure generation chamber 12, and maintains a constant flow path resistance of ink flowing into the pressure generation chamber 12 from the communication portion 13. In this embodiment, the ink supply path 14 is formed by narrowing the width of the flow path from one side. However, the ink supply path may be formed by narrowing the width of the flow path from both sides. Further, the ink supply path may be formed by narrowing from the thickness direction instead of narrowing the width of the flow path.
Thus, in this embodiment, the flow path forming substrate 10 is provided with a liquid flow path including the pressure generation chamber 12, the communication portion 13, the ink supply path 14, and the communication path 15, and ink is supplied to the pressure generation chamber 12. Filled. Of course, this ink includes solvent ink.

In addition, a nozzle plate in which a nozzle opening 21 communicating with the vicinity of the end portion of each pressure generating chamber 12 on the side opposite to the ink supply path 14 is formed on one side of the flow path forming substrate 10. 2
0 is fixed by an adhesive, a heat welding film, or the like. Here, the nozzle plate 20
Can be suitably composed of, for example, glass ceramics, a silicon single crystal substrate, stainless steel or the like.

As described above, the elastic film 50 is formed on the opening surface on the opposite side of the flow path forming substrate 10. The elastic film 50 is made of, for example, titanium oxide having a thickness of about 30 to 50 nm. An adhesion layer 56 is provided for improving the adhesion between the first electrode 60 and the base. Note that an insulator film made of zirconium oxide or the like may be provided on the elastic film 50 as necessary.

Further, on the adhesion layer 56, the first electrode 60 and a thickness of 2 μm or less, preferably 0.
A piezoelectric layer 70 that is a thin film having a thickness of 3 to 1.5 μm and a second electrode 80 are laminated to form a piezoelectric element 300. Here, the piezoelectric element 300 is a pressure generating unit in this embodiment, and refers to a portion including the first electrode 60, the piezoelectric layer 70, and the second electrode 80. In general, one electrode of the piezoelectric element 300 is used as a common electrode, and the other electrode and the piezoelectric layer 70 are patterned for each pressure generating chamber 12. In this embodiment, the first electrode 60 is connected to the piezoelectric element 300.
Although the second electrode 80 is an individual electrode of the piezoelectric element 300, there is no problem even if it is reversed for the convenience of the drive circuit and wiring. Also, here, the piezoelectric element 300 and the diaphragm that is displaced by driving the piezoelectric element 300 are collectively referred to as an actuator device.
In the above-described example, the elastic film 50, the adhesion layer 56, the first electrode 60, and the insulator film provided as necessary function as a vibration plate. However, the present invention is not limited to this. For example, the elastic film 50 and the adhesion layer 56 may not be provided. Further, the piezoelectric element 300 itself may substantially serve as a diaphragm.

Each second electrode 80 that is an individual electrode of the piezoelectric element 300 is drawn from the vicinity of the end on the ink supply path 14 side, and is extended to the elastic film 50 or an insulator film provided as necessary. For example, a lead electrode 90 made of gold (Au) or the like is connected.

On the flow path forming substrate 10 on which the piezoelectric element 300 is formed, that is, the first electrode 60 and the elastic film 5.
A protective substrate 30 having a manifold portion 31 that constitutes at least a part of the manifold 100 is bonded via an adhesive 35 on 0 or an insulating film provided as necessary and the lead electrode 90. In the present embodiment, the manifold portion 31 is formed across the protective substrate 30 in the thickness direction and across the width direction of the pressure generation chamber 12. As described above, the manifold portion 31 is connected to the communication portion 13 of the flow path forming substrate 10. A manifold 100 is formed which communicates and serves as a common ink chamber for the pressure generation chambers 12. Alternatively, the communication portion 13 of the flow path forming substrate 10 may be divided into a plurality of pressure generation chambers 12 and only the manifold portion 31 may be used as a manifold. Further, for example, only the pressure generation chamber 12 is provided in the flow path forming substrate 10 and a member (for example, an elastic film 50, an insulator film provided as necessary, etc.) interposed between the flow path forming substrate 10 and the protective substrate 30 is provided. ) May be provided with an ink supply path 14 for communicating the manifold 100 and each pressure generating chamber 12.

A piezoelectric element holding portion 32 having a space that does not hinder the movement of the piezoelectric element 300 is provided in a region of the protective substrate 30 that faces the piezoelectric element 300. Piezoelectric element holder 32
Need only have a space that does not hinder the movement of the piezoelectric element 300, and the space may or may not be sealed.

As such a protective substrate 30, it is preferable to use a material substantially the same as the coefficient of thermal expansion of the flow path forming substrate 10, for example, glass, a ceramic material, etc. In this embodiment, the flow path forming substrate 10
Is formed using a silicon single crystal substrate of the same material.

Further, the protective substrate 30 is provided with a through hole 33 that penetrates the protective substrate 30 in the thickness direction, and the vicinity of the end portion of the lead electrode 90 drawn from each piezoelectric element 300 is exposed in the through hole 33. It is comprised so that it may do.

On the other hand, a drive circuit 120 that drives the piezoelectric element 300 under control of a control unit (not shown in FIGS. 1 to 3) described in detail later is fixed on the protective substrate 30. For example, a circuit board or a semiconductor integrated circuit (IC) can be used as the drive circuit 120. And
The drive circuit 120 and the lead electrode 90 are electrically connected via a connection wiring 121 made of a conductive wire such as a bonding wire.

In addition, a compliance substrate 40 including a sealing film 41 and a fixing plate 42 is bonded onto the protective substrate 30. Here, the sealing film 41 is made of a material having low rigidity and flexibility, and one surface of the manifold portion 31 is sealed by the sealing film 41.
The fixing plate 42 is formed of a relatively hard material. Since the region of the fixing plate 42 facing the manifold 100 is an opening 43 that is completely removed in the thickness direction,
One surface of the manifold 100 is sealed only with a flexible sealing film 41.

In such a recording head main body I, ink is taken in from an ink introduction port connected to an external ink supply means (not shown), and the interior from the manifold 100 to the nozzle opening 21 is filled with ink, and then a drive signal from the drive circuit 120 is received. Accordingly, a voltage is applied between each of the first electrode 60 and the second electrode 80 corresponding to the pressure generating chamber 12, and the elastic film 50 and the adhesion layer 5 are applied.
6. By bending and deforming the first electrode 60 and the piezoelectric layer 70, the vibration accompanying the deformation is transmitted to the ink in each pressure generating chamber 12 via the elastic film 50 functioning as a vibrating portion. As a result, the pressure in each pressure generating chamber 12 increases and ink droplets are ejected from the nozzle openings 21.

FIG. 4 is a schematic view showing a recording apparatus which is a liquid ejecting apparatus according to this embodiment. As shown in the drawing, in the recording apparatus II according to this embodiment, a recording head main body I having an ink flow path communicating with an ink cartridge or the like constitutes recording head units 1A and 1B. here,
The recording head units 1A and 1B are detachably provided with cartridges 2A and 2B that constitute ink supply means and store ink to be ejected from the nozzle openings 21 (see FIG. 3) of the head body I. A carriage 3 on which the units 1A and 1B are mounted is provided on a carriage shaft 5 attached to the apparatus body 4 so as to be movable in the axial direction.
The recording head units 1A and 1B, for example, are configured to eject a black ink composition and a color ink composition, respectively. Then, the driving force of the driving motor 6 is transmitted to the carriage 3 via a plurality of gears and a timing belt 7 (not shown), so that the carriage 3 on which the recording head units 1A and 1B are mounted is moved along the carriage shaft 5. The On the other hand, the apparatus body 4 is provided with a platen 8 along the carriage shaft 5, and a recording sheet S, which is a recording medium such as paper fed by a paper feed roller (not shown), is placed on the platen 8.
It is wound around and transported.

FIG. 5 is a block diagram showing a control system of the recording apparatus according to this embodiment. As shown in the figure
The recording head IA according to this embodiment includes a timer unit 130, a storage unit 131, a comparison unit 132, a setting unit 133, a thermistor 135, and a correction table 136. These are all electronic components, and are mounted on a recording head body I (see FIGS. 1 to 3; the same applies hereinafter) and integrated with the recording head body I. In addition, these operate similarly when power is supplied from a power source 134 which is a battery mounted on the recording head main body I. Therefore, the recording head IA
Even when the recording device II is removed from the recording apparatus II or when the recording apparatus II is powered off, each predetermined operation can be continued. Further, the ink stored in the cartridge 2 which is a liquid supply source is supplied to the head body I through the liquid flow passage 9.

On the other hand, the apparatus main body 4 of the recording apparatus II is also equipped with a control unit 137, a drive motor 6 whose drive is controlled by the control unit 137, a supply roller 23, and a display unit 138.

The piezoelectric element 300 of the recording head main body I is driven by a predetermined drive signal formed by the drive circuit 120 based on the switching signal S1 supplied from the control unit 137 to the drive circuit 120, and is bent and deformed to enter the pressure generating chamber 12. A predetermined pressure change is caused, and the nozzle opening 21
Ink droplets are ejected through

The timer 130 measures a predetermined elapsed time based on the measurement start signal S2 sent from the controller 137. The measurement start signal S2 is sent from the cartridge 2 to the head body I through the liquid flow path 9 when ink is filled. Therefore, for example, an initial filling signal for performing the initial filling of ink can be preferably used. As a result, the measurement start signal S2 is a signal representing the time point when the recording head main body I is initially filled with ink.

The elapsed time measured by the time measuring unit 130 is stored in the storage unit 13 as an elapsed time signal S3 representing the elapsed time.
1 is stored. In the comparison unit 132, the elapsed time signal S stored in the storage unit 131 and transmitted.
4 and a setting signal S5 representing a setting value preset in the setting means 133, an excess signal S8 indicating that the life of the recording head main body I has elapsed when S4> S5 is satisfied. 137. Upon receiving the excess signal S8, the control unit 137 displays on the display unit 138 information indicating that the recording head body I is in the replacement period.

As described above, in this embodiment, the measurement is started at the timing of the start of ink flow, and the time measurement information is stored in the storage unit 131 one by one. In addition, since the power supply 134 for operating each unit is mounted on the recording head main body I independently of the apparatus main body 4 side, the time elapsed since the recording head main body I was filled with ink is continuously measured. Can be remembered. Therefore, the excess signal S8 accurately reflects the life of the recording head main body I that is aged with ink, and the display unit 138 can appropriately display the replacement time of the recording head main body I.

Further, the thermistor 135 and the correction table 136, which are a kind of temperature sensor, are also mounted and integrated in the recording head body I of the recording head IA in this embodiment. Here, the correction table 136 is a recording head body I that represents the temperature detected by the thermistor 135.
The correction means corrects the setting signal S5 by a correction signal S7 indicating the correction amount of the set value based on the temperature signal S6 indicating the environmental temperature of That is, the aging deterioration due to the ink of the recording head main body I proceeds more markedly when the environmental temperature is higher. Therefore, when used in an environment where the temperature is high even at the same elapsed time, the deterioration over time becomes prominent. Therefore, it is necessary to consider the temperature history of the environmental temperature in order to determine the replacement time more accurately. In this embodiment, the correction amount to be corrected for the reference environmental temperature is tabulated for each temperature, and the correction amount at this time is corrected using the environmental temperature and the time spent at the environmental temperature as parameters. The amount is determined.

As a result, the comparison unit 132 forms the excess signal S8 by comparing the elapsed time signal S4 with the appropriately corrected setting signal S5. Therefore, the excess signal S8 accurately indicates the replacement timing of the recording head body I accordingly. Signal. An accurate replacement warning based on the excess signal S8 is displayed on the display unit 1.
38 can be displayed.

(Other embodiments)
As mentioned above, although each embodiment of this invention was described, the basic composition of this invention is not limited to what was mentioned above. For example, in the above embodiment, the measurement start signal S2 is sent from the control unit 137 on the apparatus main body 4 side, but the liquid flow path 9 from the cartridge 2 that is a liquid supply source.
A measurement start signal can also be suitably formed by providing a liquid flow detection sensor for detecting that ink has been supplied to the liquid and using an output signal of the liquid flow detection sensor.
For example, when the ink has electrical conductivity, the liquid flow detection sensor can easily achieve the object by detecting the presence or absence of electrical conduction in the liquid flow passage 9. Also,
The object can also be satisfactorily achieved by detecting the pressure generated when liquid flows in the liquid flow passage 9.

Further, the recording head main body I in the above embodiment has been described using the thin film type piezoelectric element 300 as the pressure generating means for causing the pressure generating chamber 12 to change the pressure. Absent. For example, a thick film type piezoelectric actuator formed by a method such as attaching a green sheet, or a longitudinal vibration type piezoelectric actuator in which piezoelectric materials and electrode forming materials are alternately stacked to expand and contract in the axial direction is used. be able to. Further, it may be a so-called electrostatic actuator that generates static electricity between the diaphragm and the electrode, deforms the diaphragm by electrostatic force, and ejects droplets from the nozzle openings.

In the embodiment shown in FIG. 4, the recording head units 1A and 1B are mounted on the carriage 3 that moves in the direction (main scanning direction) intersecting the conveyance direction of the recording sheet S, and the recording head units 1A and 1B are the main ones. This is a so-called serial type ink jet recording apparatus that performs printing while moving in the scanning direction, but is not limited thereto. Of course, a so-called line-type ink jet recording apparatus that performs printing simply by transporting the recording sheet S while the recording head main body is fixed may be used.

Furthermore, in the above-described embodiment, the ink jet recording apparatus has been described as an example of the liquid ejecting apparatus. However, the present invention is widely applied to all liquid ejecting apparatuses having a liquid ejecting head, and liquid other than ink. Needless to say, the present invention can also be applied to a liquid ejecting apparatus that includes a liquid ejecting head that ejects the liquid. 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.

I Inkjet recording head body (recording head body), IA recording head, II
Inkjet recording apparatus (recording apparatus), 10 flow path forming substrate, 12 pressure generating chamber, 20 nozzle plate, 21 nozzle opening, 60 first electrode, 70 piezoelectric layer, 80 second electrode, 90 lead electrode, 100 manifold, 120 drive circuit, 130 timing unit, 131 storage unit, 132 comparison unit, 133 setting means,
134 power supply, 135 thermistor, 136 correction table, 137 control unit,
138 Display unit, 300 Piezoelectric element

Claims (6)

A pressure generating chamber filled with a liquid supplied from a liquid supply source via a liquid flow passage, a pressure generating means for generating a pressure change in the liquid in the pressure generating chamber by supplying a drive signal, and the pressure change with the pressure change A liquid ejecting head body having a nozzle opening for discharging the liquid in the pressure generating chamber as droplets;
Time measuring means mounted on the liquid ejecting head body and measuring an elapsed time from the time when the supply of the liquid to the liquid flow path is detected;
Storage means mounted on the liquid jet head body and storing the elapsed time measured by the time measuring means;
The elapsed time mounted on the liquid jet head main body and stored in the storage means is compared with a preset time based on the life of the liquid flow path for the liquid, and the elapsed time is set to the preset time. Comparing means for sending a signal indicating this when it exceeds,
A liquid ejecting head, comprising: a power source mounted on the liquid ejecting head main body and operating the time measuring means, the storage means, and the comparing means. The liquid ejecting head according to claim 1,
A temperature detection sensor mounted on the liquid jet head main body; and a correction unit that corrects the set time based on a temperature detected by the temperature detection sensor. The correction unit corrects the set time. A liquid ejecting head characterized by that. The liquid ejecting head according to claim 2,
The correction means has a correction table in which the temperature detected by the temperature detection sensor is associated with the correction value of the set time, and the set time is corrected by the correction table. Jet head. In the liquid jet head according to any one of claims 1 to 3,
It is detected that the liquid is supplied from the liquid supply source to the liquid flow path, and a signal indicating that the start of liquid flow is detected is sent to the time passage means when the liquid flow is detected. A liquid ejecting head comprising a liquid detecting means mounted on the head body. A liquid ejecting head according to any one of claims 1 to 3 ,
Display means for notifying the replacement warning of the liquid jet head;
When the liquid passage start is detected for the previous SL liquid jet head, in that the signal indicating that the liquid passing start is detected sends to the aging unit, further wherein the elapsed time exceeds the set time signal when it is supplied with representative, and a control unit for the elapsed time to operate the display means to process a signal indicating that exceeds the set time,
A liquid ejecting apparatus characterized by mounting a. A liquid ejecting head according to claim 4 ;
Display means for notifying the replacement warning of the liquid jet head;
When the previous SL elapsed time is supplied a signal indicating that exceeds the set time, a control unit for the elapsed time to operate the display means to process a signal indicating that exceeds the set time,
A liquid ejecting apparatus characterized by mounting a.

Images