CN106956514B - Liquid discharging head and liquid discharge apparatus - Google Patents

Abstract

The present invention relates to a kind of liquid discharging head and liquid discharge apparatus.The liquid discharging head includes the recording element substrate with the first face provided with multiple recording elements and the outlet for recording element, wherein being directed to, each recording element forms pressure chamber and liquid is discharged from outlet.On second face opposite with the first face of recording element substrate, liquid supply passage and liquids recovery channel are set for multiple recording element common lands.So that pressure chamber respectively passes through supply mouth and recovery port and is connected to liquid supply passage and liquids recovery channel, and generate from liquid supply passage via pressure chamber up to liquids recovery channel flowing.The synthesis flow impedance of liquids recovery channel and recovery port is greater than the synthesis flow impedance of liquid supply passage and supply mouth.

Description

Liquid discharging head and liquid discharge apparatus

Technical field

The present invention relates to a kind of liquid discharging head and use the liquid discharge apparatus of the liquid discharging head.

Background technique

By the way that liquid to be discharged in recording medium to the liquid discharge apparatus recorded using liquid discharging head, wherein The liquid discharging head has the pressure chamber being connected to outlet and provides the record of the energy to the indoor liquid of discharge pressure Element.In the ink jet recording device as the representative of liquid discharge apparatus, record liquid is discharged from outlet.Recording liquid is solvent Included in dyestuff or pigment etc. color material.Such as in this liquid discharge apparatus, the liquid to be discharged be record In the case where liquid, near outlet record liquid in volatile component potential evaporation, therefore color material concentration increase, thus lead Cause the irregular color in record image.There is also situations where: the evaporation of volatile component increases the liquid near outlet The viscosity of body, it reduce the velocities of discharge of liquid, therefore liquid can not accurately reach the desired locations in recording medium.Easily The evaporation of volatile ingredient is also possible to lead to the blocking of outlet and pressure chamber etc..

A known measure for coping with this problem be make liquid via liquid discharging head and especially via Pressure chamber is recycled.For example, Japanese Unexamined Patent Application Publication (patent disclosure of PCT translator of Japanese) 2003-505281 is disclosed the following contents: Outlet and recording element are set for each pressure chamber, is arranged from common feed path branch, passed through pressure chamber and sharing The channel at recovery approach interflow, and make largely to record liquid stream through the channel.

Although each pressure chamber and coupled channel in liquid discharging head 3 are relatively narrow, Japanese Unexamined Patent Application Publication 2003- The amount that structure described in 505281 passes through the liquid of narrow passage is greater than the amount for the liquid being discharged from outlet, this leads to channel Interior pressure distribution (pressure decline) increases.If pressure distribution or the variation of pressure are big, will be in the row from outlet It changes in characteristic out, and the quality that record is formed by recording medium will deteriorate.It is contemplated that making liquid with small Flow flows to pressure chamber, to avoid the deterioration of this quality.However, being deposited if reduced via the amount of the liquid of pressure chamber's circulation In following situation: if increased suddenly by the amount for the liquid for driving recording element to be discharged from outlet, passing through pressure chamber And the high-temp liquid for flowing to downstream side will be to pressure chamber's adverse current.The heat of liquid counter-current is generated with due to driving recording element Heat combines, this will make the temperature of the liquid near outlet become even more hot.On the other hand, if be discharged from outlet The state of liquid continues, then the liquid of heating is gradually discharged as described above, and by supplying cold liquid to pressure chamber To be replaced.As a result, the temperature of the liquid near outlet gradually returns to normal temperature.Therefore, it is followed via pressure chamber In the small configuration of the flow of the liquid of ring, the temperature of the liquid near outlet is temporarily increased with the beginning of record operation, It is back to normal condition later.The temperature change may change the velocity of discharge or discharge rate of liquid, and influence to record matter Amount.

Summary of the invention

It has been found that being intended to provide a kind of liquid discharging head and the liquid discharge apparatus using the liquid discharging head, thus The liquid circulation for being directed to pressure chamber can be realized in the case where that will not cause to be discharged characteristic variations, and is inhibited due to high-temperature liquid It crosses and heats up caused by adverse current of the body to pressure chamber.

A kind of liquid discharging head, comprising: recording element substrate has and is provided with the first of multiple recording elements Face, multiple recording elements are used to generate the energy liquid is discharged；Partition wall, configuration adjacent recording element it Between；And outlet, it is configured for each recording element, and face the recording element, wherein be directed to Each recording element forms pressure chamber using the partition wall, and is discharged using the recording element from the outlet The indoor liquid of pressure.The liquid discharging head also includes liquid supply passage, is connected to multiple pressure chambers, And it is formed on the second face as the opposing face opposite with first face of the recording element, liquids recovery channel, It is connected to multiple pressure chambers, and is formed on second face, supply mouth, in the pressure chamber and the liquid It is connected between feed path and recovery port, is connected between the pressure chamber and the liquids recovery channel.Do not arranging Out under the standby mode of liquid, from the liquid supply passage via the supply mouth, the pressure chamber, the recovery port and institute It states liquids recovery channel and forms flow path.The synthesis flow impedance of the liquids recovery channel and the recovery port is greater than the liquid The synthesis flow impedance of feed path and the supply mouth.

Liquid discharge apparatus according to the present invention includes: liquid discharging head according to the present invention；Storage element, for storing Liquid；First circulation system, for recycling liquid from the storage element；And second circulation system, for use than institute The low pressure of first circulation system is stated recycle liquid from the storage element.The liquid supply passage is followed with described first Loop system connection, and the liquids recovery channel and the second circulation system connectivity.

A kind of liquid discharging head according to the present invention, comprising: multiple recording elements, for generating the energy liquid is discharged Amount；Recording element substrate has the first face for being provided with multiple recording elements；Outlet, for liquid to be discharged；And Pressure chamber, internal includes the recording element, wherein the recording element substrate includes liquid supply passage, and multiple Pressure chamber connection, and being formed on the second face as the opposite side in first face, liquids recovery channel, and it is more A pressure chamber's connection, and be formed on second face, supply mouth, it is logical with the pressure chamber and liquid supply Road connection and recovery port, are connected to the pressure chamber and the liquids recovery channel, and liquid is from the liquid supply passage Successively the liquids recovery channel and the liquid are flow to via the supply mouth, the pressure chamber and the recovery port Recovery approach and the synthesis flow impedance of the recovery port are greater than the synthesis flowing of the liquid supply passage and the supply mouth Impedance.

A kind of liquid discharge apparatus according to the present invention, comprising: liquid discharging head comprising: recording element substrate, tool There is the first face for being provided with multiple recording elements, multiple recording elements are used to generate the energy liquid is discharged, discharge Mouthful, for liquid to be discharged, pressure chamber, internal includes the recording element, liquid supply passage, with multiple pressure chambers Connection, and be formed on the second face as the opposite side in first face, liquids recovery channel, with multiple pressure Room connection, and be formed on second face, supply mouth is connected to the pressure chamber and the liquid supply passage, with And recovery port, it is connected to the pressure chamber and the liquids recovery channel；Storage element, for storing liquid；And liquid Transfer unit, for supplying and recycling the liquid between the storage element and the liquid discharging head, wherein liquid is from described Liquid supply passage successively flow to the liquids recovery channel via the supply mouth, the pressure chamber and the recovery port, And the synthesis flow impedance of the liquids recovery channel and the recovery port is greater than the liquid supply passage and the supply The synthesis flow impedance of mouth.

By the explanation below with reference to attached drawing to exemplary embodiments, other feature of the invention be will be apparent.

Detailed description of the invention

Fig. 1 is the figure for showing the schematic construction according to the exemplary liquid discharge apparatus of first structure.

Fig. 2 is the figure for showing first circulation configuration.

Fig. 3 is the figure for showing second circulation configuration.

Fig. 4 A and 4B are the perspective views for showing the structure of liquid discharging head.

Fig. 5 is the exploded perspective view of liquid discharging head.

Fig. 6 A~6F is the figure for showing the structure of front and back of channel component.

Fig. 7 is the perspective view for showing the relationship between channel.

Fig. 8 is the sectional view for showing channel component and module being discharged.

Fig. 9 A and 9B are the figures for illustrating to be discharged module.

Figure 10 A~10C is the figure for showing the structure of recording element substrate.

Figure 11 is the fragmentary perspective cross sectional view for showing the structure of recording element substrate.

Figure 12 is the plan view for showing adjacent recording element substrate.

Figure 13 is the figure for showing the schematic construction of the liquid discharge apparatus according to the second topology example.

Figure 14 A and 14B are the perspective views for showing the structure of liquid discharging head.

Figure 15 is the exploded perspective view of liquid discharging head.

Figure 16 A~16E is the figure for showing the structure of channel component.

Figure 17 is the perspective view for showing the connection relationship in channel component.

Figure 18 is to show channel to form component and the sectional view of module is discharged.

Figure 19 A and 19B are the figures for illustrating to be discharged module.

Figure 20 A~20C is the figure for showing the structure of recording element substrate.

Figure 21 is the perspective view for illustrating the liquid deliverying unit in liquid discharging head according to an embodiment of the present invention.

Figure 22 is the perspective view that module is discharged.

Figure 23 is the exploded perspective view of recording element substrate.

Figure 24 A and 24B are for illustrating the pressure chamber in recording element substrate and the figure of outlet.

Figure 25 is the figure for illustrating the loop configuration in liquid discharge apparatus.

Figure 26 A and 26B are the figures for illustrating the flowing of liquid.

Figure 27 is the schematic section shown according to the first exemplary base main body unit.

Figure 28 is the schematic section for showing the base main body unit according to the first comparative example.

Figure 29 is to show pressure room temperature with the figure of the variation of time.

Figure 30 is to show pressure room temperature with the figure of the variation of time.

Specific embodiment

Illustrate below with reference to attached drawing present invention can apply to topology example, embodiment and example.It should be appreciated that with Under explanation there is no limit the scope of the present invention.As an example, it will be described below so-called hot mode liquid discharging head, In the hot mode liquid discharging head use heater element as generating the recording element of the energy liquid is discharged, pass through Bubble is generated in the indoor liquid of pressure using heat liquid is discharged from outlet.However, present invention can apply to liquid Discharge head is not limited to hot mode, and present invention could apply to using piezo electrics using piezoelectric element and various other The liquid discharging head of the liquid discharge mode of type.The liquid discharging head of the liquid according to the present invention for being used to be discharged ink etc. It can be applied to such as printer, copying machines, with the fax of communication system with the liquid discharge apparatus with the liquid discharging head The equipment of device and word processing device with printer unit etc., and apply also for complex method and various processing units The industrial recording apparatus being combined.For example, the present invention can be used to make biochip, printed electronic circuit, production semiconductor Substrate and other this purposes.

Although the following description is related to making the liquid for recording liquid etc. to recycle between liquid storage device and liquid discharging head Liquid discharging head 3 used in liquid discharge apparatus, but use the liquid discharge apparatus of liquid discharging head according to the present invention It is without being limited thereto.Present invention could apply to the following configurations of liquid discharge apparatus: instead of making liquid circulation, two liquid storage devices are arranged (upstream side for being located at liquid discharging head and another be located at downstream side), and by making liquid via liquid discharging head The indoor liquid flowing of pressure to make liquid discharging head is flowed from a liquid storage device to another liquid storage device.

In addition, the following description is related to length so-called row type head corresponding with the width of recording medium, but the present invention Apply also for the so-called string that the record in recording medium is completed by the scanning along main scanning direction and sub-scanning direction Row type liquid discharging head.The example of serial type liquid discharging head is that have respectively for record black recording liquid and for recording Colour record liquid a recording element substrate liquid discharging head, but this and it is unrestricted.Serial type liquid discharging head Example can be following configuration: form the short formula row type head shorter than the width of recording medium, plurality of recording element substrate It is arranged in outlet to be overlapped on outlet line direction, and these short formula row type heads are scanned on the recording medium.

According to the explanation of the exemplary liquid discharging head equipment of first structure

Firstly, the example as liquid discharge apparatus according to the present invention, explanation is made by that will record liquid from outlet The ink jet recording device 1000 (be below also referred to as " recording equipment ") that is recorded is discharged in recording medium for liquid.Figure 1 is shown as the schematic construction of the recording equipment 1000 according to the exemplary liquid discharge apparatus of first structure.Recording equipment 1000 It is configured with the supply unit 1 for conveying recording medium 2 and in the mode substantially vertical with the conveying direction of recording medium 2 Row type liquid discharging head 3, and be for carrying out single pass while continually or intermittently conveying multiple recording medium 2 (pass) continuous recording row type recording equipment.Recording medium 2 is not limited to cut thin slice, and it is thin to can be continuous reel Piece.Liquid discharging head 3 can utilize colored record liquid (these colors of cyan (C), magenta (M), yellow (Y) and black (K) Also it is collectively referred to as CMYK) carry out panchromatic printing.As it is explained in detail hereinafter, liquid discharging head 3 is connected to conduct and fluidly connecting Liquid supply for supplying from the feed path of liquid to liquid discharging head 3 configures, main liquid storage device and buffer reservoir are (referring to figure 2).Shown in Fig. 2 as will be described later, liquid discharging head 3 can be approximately separated into fluid supply unit 220, vacuum cavitations list Member 230 and liquid deliverying unit 300.Multiple recording element substrates 10 are set to liquid deliverying unit 300 and common feed is logical Road 211 and shared recovery approach 212, wherein multiple recording elements are arranged to each recording element substrate 10.It is discharged in liquid single In member 300, as indicated by the arrows of fig. 2, the supply record liquid from common feed path 211 to recording element substrate 10, and utilize It shares recovery approach 212 and recycles the record liquid.Liquid discharging head 3 is also electrically connected to for passing electric power and discharge control signal Transport to the electric control unit of liquid discharging head 3.The liquid path being particularly described below in discharge head 3 and electric signal road Diameter.

The explanation of first circulation configuration

First Fig. 2 shows the form as the circulating path structure for being applied to liquid discharge apparatus according to the present invention follows Ring configuration.In first circulation configuration, liquid discharging head 3 is connected on high-tension side first circulation pump and fluidly connecting 1001, the first circulation of low-pressure side pumps 1002 and buffer reservoir 1003 etc..Although only showing CMYK in order to illustrate succinct, Fig. 2 The record liquid stream of a color in the respective record liquid of color it is dynamic via path, but in fact, liquid discharging head 3 and remember There are four the circulating paths of color for the setting of recording apparatus master unit.As the slow of the auxiliary liquid storage device being connected with main liquid storage device 1006 Liquid storage device 1003 is rushed with atmosphere connection port (not shown), the thus inside and outside connection of liquid storage device, and can will be recorded Bubble in liquid is discharged to the outside.Buffer reservoir 1003 is additionally coupled to replenishment pump 1005.For example by from liquid discharging head 3 Outlet discharge (ejections) record liquid come in liquid discharging head 3 consumable liquid with recorded or attracted recovery etc. situation Under, replenishment pump 1005 is used to the record liquid of amount identical with consumed amount transferring to buffer reservoir from main liquid storage device 1006 1003。

Two first circulations pump 1001 and 1002 as liquid transfer unit from the liquid of liquid discharging head 3 for connecting 111 extracting liq of portion, and the liquid is made to flow to buffer reservoir 1003.It is fixed that first circulation pump 1001 and 1002 preferably has The volume type pump of the liquor charging ability of amount.Specific example may include tube pump, gear pump, diaphragm pump and syringe pump etc..For example, may be used also To use by exporting the configuration for configuring common permanent flow valve and safety valve to ensure constant flow rate in pump.In just driving liquid When deliverying unit 300, the first circulation pump 1002 of on high-tension side first circulation pump 1001 and low-pressure side respectively makes the note of constant basis Liquid stream is recorded through common feed path 211 and shared recovery approach 212.It is preferred that being the record of liquid discharging head 3 by the flow set Temperature difference between device substrate 10 will not influence the degree of the recording image quality in recording medium 2 or more.On the other hand, such as The fruit flow be set to it is excessively high, then in the channel in liquid deliverying unit 300 pressure decline influence cause record member Excessive Negative Pressure Difference is generated between part substrate 10, this causes to generate uneven concentration in record image.It is therefore preferable that considering Flow is arranged in temperature difference and Negative Pressure Difference between recording element substrate 10.Record liquid recycled via path in, Path including on high-tension side first circulation pump 1001 constitutes the first circulation system in liquid discharge apparatus, and including low pressure The path of the first circulation pump 1002 of side constitutes the second circulation system in liquid discharge apparatus.

1004 are pumped second circulation is arranged on the path of supply record liquid from buffer reservoir 1003 to liquid discharging head 3. The configuration of vacuum cavitations unit 230 is on the path between second circulation pump 1004 and liquid deliverying unit 300.Vacuum cavitations unit 230 serve it is as follows: even if in record the circulatory system flow due to duty ratio difference and in the case where fluctuate, can also make The pressure in the downstream side (that is, 300 side of liquid deliverying unit) of vacuum cavitations unit 230 is maintained at preset constant pressure.Negative pressure Control unit 230 has two pressure adjustmenting mechanisms for being respectively arranged to different control pressure.Any mechanism can be used As the two pressure adjustmenting mechanisms, as long as the pressure in the downstream side of the mechanism can be controlled as with desired setting pressure Centered on constant range below interior fluctuation.As an example, it can use and be equal with so-called " pressure reducing regulator " Mechanism.In the case where using pressure reducing regulator as pressure adjustmenting mechanism, as shown in Fig. 2, being pumped preferably by second circulation 1004 pressurize via fluid supply unit 220 to the upstream side of vacuum cavitations unit 230.Make it possible to inhibit to buffer liquid storage in this way Influence of the head pressure of device 1003 to liquid discharging head 3, to provide the buffer reservoir 1003 in recording equipment 1000 The bigger freedom degree of layout.When driving liquid discharging head 3 in the range of the circular flow of used record liquid, second circulation Pump 1004 has certain lift pressure or more, this is sufficient, and Scroll-type pump and volume type pump can be used etc..Specifically Diaphragm pump etc. can be used in ground.Optionally, instead of second circulation pump 1004, it is, for example, possible to use relative to vacuum cavitations list There are the head liquid storage devices that the mode of certain head difference configures for member 230.

In two pressure adjustmenting mechanisms in vacuum cavitations unit 230, side is arranged in (shown in the H of Fig. 2) relatively high pressure Pressure adjustmenting mechanism the common feed path 211 in liquid deliverying unit 300 is connected to via fluid supply unit 220.Together The pressure adjustmenting mechanism of sample, (shown in the L of Fig. 2) relatively low pressure setting side is connected to liquid row via fluid supply unit 220 Shared recovery approach 212 in unit 300 out.In addition to common feed path 211 and shared recovery approach 212, liquid discharge is single Member 300 is additionally provided with the individual feed path 213 being respectively connected to recording element substrate 10 and individual recovery approach 214.It will be each Individual feed path 213 and individual recovery approach 214 set by recording element substrate are referred to as " individual channel ".These individuals Channel is to collaborate from 211 branch of common feed path and at shared recovery approach 212 and be connected to the two channels What mode was arranged.Therefore, following flowing occurs: a part of the liquid of record liquid etc. is flowed from common feed path 211 The inside of recorded device substrate 10, and flow to and share recovery approach 212 (showing using the hollow arrow of Fig. 2).Its reason Be: on high-tension side pressure adjustmenting mechanism H is connected to common feed path 211, and the pressure adjustmenting mechanism L connection of low-pressure side Recovery approach 212 is extremely shared, therefore generates pressure difference between two common-use tunnels.

Thus, following flowing occurs in liquid deliverying unit 300: flowing through common feed path 211 in liquid and shares While recovery approach 212 is respective, a part of the liquid passes through recording element substrate 10.Therefore, recording element substrate 10 produces Raw heat can be discharged by the flowing via common feed path 211 and shared recovery approach 212 from recording element substrate 10 To outside.The structure also allows for wanting when just being recorded using liquid discharging head 3, without using in outlet and pressure chamber The flowing of the record liquid of generation is recorded, thus the Vehicle Composition due to record liquid can be inhibited to evaporate at these positions And the viscosity for recording liquid is caused to get higher.It is shared back furthermore, it is possible to which the foreign matter in the record liquid and record liquid after thickening is expelled to Receive channel 212.Therefore, it is recorded with making it possible to high speed and high image quality using above-mentioned liquid discharging head 3.

The explanation of second circulation configuration

Fig. 3 is in the loop configuration structure shown applied to liquid discharge apparatus according to the present invention as with above-mentioned The schematic diagram of the second circulation configuration of the different loop configuration of one loop configuration.Second circulation configuration is followed relative to above-mentioned first The main difference of ring configuration is: two pressure adjustmenting mechanisms for constituting vacuum cavitations unit 230 are all to by negative pressure control The pressure control of the upstream side of unit 230 processed is formed in the mechanism fluctuated in the constant range centered on it is expected that pressure is arranged.This Kind pressure adjustmenting mechanism can be configured to the mechanism part with the identical operation with so-called " back pressure regulator ".Second circulation pump 1004 are used as the negative pressure source depressurize the downstream side of vacuum cavitations unit 230, and on high-tension side first circulation pump 1001 The upstream side of liquid discharging head 3 is configured at the first circulation pump 1002 of low-pressure side.Therefore, vacuum cavitations unit 230 is configured at The downstream side of liquid discharging head 3.

Even if when being recorded using liquid discharging head 3, the feelings that flow is fluctuated due to recording the difference of duty ratio Under condition, according to the vacuum cavitations unit 230 that second circulation configures be also used for making the upstream side of itself pressure oscillation maintain with In constant range centered on preset pressure.Here, the upstream side of vacuum cavitations unit 230 is 300 side of liquid deliverying unit.Such as Shown in Fig. 3, preferably by second circulation pump 1004 via fluid supply unit 220 to the downstream side of vacuum cavitations unit 230 into Row pressurization.Make it possible to the influence for inhibiting the head pressure of buffer reservoir 1003 to liquid discharging head 3 in this way, to provide needle To the bigger range of choice of the layout of the buffer reservoir 1003 in recording equipment 1000.Optionally, it is pumped instead of second circulation 1004, can be used for example by relative to vacuum cavitations unit 230 there are specific head difference in a manner of the head liquid storage device that configures.

In a manner of identical with first circulation configuration, vacuum cavitations unit 230 shown in Fig. 3 has provided with different from each other Control pressure two pressure adjustmenting mechanisms.Side is arranged in (shown in the H of Fig. 3) high pressure and (shown in the L of Fig. 3) low pressure is arranged The pressure adjustmenting mechanism of side is connected to the common feed path in liquid deliverying unit 300 via fluid supply unit 220 respectively 211 and shared recovery approach 212.It is relatively higher than the pressure of common feed path 211 using the two pressure adjustmenting mechanisms Thus following flowing occurs for the pressure for sharing recovery approach 212: record liquid is from common feed path 211 via individual channel It is flowed to the inner passage in recording element substrate 10 and shares recovery approach 212.The record in Fig. 3 is indicated using hollow arrow The flowing of liquid.Thus, second circulation configuration generates the flowing with the record liquid of first circulation configuration in liquid deliverying unit 300 The flow regime of the identical record liquid of state, but have the advantages that two different from the case where first circulation configuration.

One advantage is as follows: being configured using second circulation, vacuum cavitations unit 230 is configured at the downstream of liquid discharging head 3 Side, thus at vacuum cavitations unit 230 caused by dust and foreign matter the risk of influent discharge head 3 is smaller.

Second advantage is as follows: compared with the case where first circulation configures, in second circulation path, from buffer reservoir The maximum value of the 1003 required flows supplied to liquid discharging head 3 can be smaller.The reason is as follows that.It will indicate recording using A Total flow in the case that standby period is recycled in common feed path 211 and shared recovery approach 212.The value of A is determined Justice is the temperature made in liquid deliverying unit 300 in the case where the temperature for recording standby period progress liquid discharging head 3 adjusts Difference maintains minimum discharge required in expected range.In addition, by note is being discharged from all outlets of liquid deliverying unit 300 Delivery flow in the case where record liquid (full discharge) is defined as F.Therefore, in the case where first circulation configures (Fig. 2), first is followed It is A that ring, which pumps (high-pressure side) 1001 and the setting flow of first circulation pump (low-pressure side) 1002, therefore to liquid needed for full discharge The maximum value that the liquid supply amount of head 3 is discharged is A+F.On the other hand, Fig. 3 second circulation configuration in the case where, record to When machine it is required to the liquid supply amount of liquid discharging head 3 be flow A.This means that liquid discharging head 3 needed for full discharge Supply amount be flow F.Therefore, in the case where second circulation configures, on high-tension side first circulation pump 1001 and and low-pressure side The aggregate value of setting flow, the maximum value of i.e. required supply amount of first circulation pump 1002 be the larger value in A and F.Thus, As long as using mutually isostructural liquid deliverying unit 300, the maximum value (A or F) of the required supply amount in second circulation configuration It is consistently less than the maximum value (A+F) of the required supply amount in first circulation configuration.As a result, in the case where second circulation configuration, Freedom degree related with adaptable circulating pump is higher, and the simply inexpensive circulating pump of structure can be used, and can drop The low load for the cooler (not shown) configured on master side path, thus reduce recording equipment master unit at This.The advantage becomes apparent in the case where the value of A or F relatively large line style head, and in the longitudinal direction of line style head Length is longer, and the advantage is more useful.

However, on the other hand, the several points for having more advantage compared with second circulation configuration are configured there are first circulation.Utilize Two loop configurations flow through the maximum flow of liquid deliverying unit 300 when recording standby, thus the record duty ratio of image is lower, The negative pressure for being applied to nozzle is bigger.Therefore, especially in the channel width for making common feed path 211 and shared recovery approach 212 In the case that degree reduces so that head width reduces, in easily visible non-uniform low duty ratio image, it may apply to nozzle High negative pressure, this may be such that the influence of satellite droplet increases.Note that the channel of common feed path 211 and shared recovery approach 212 Width is the length on the direction vertical with the flow direction of liquid, and head width is on the short side direction of liquid discharging head 3 Length.On the other hand, in the case where first circulation configures, apply high pressure to nozzle when forming high duty ratio image, because And generated any satellite droplet is less obvious in record image, this is in small this aspect of influence for picture quality It is advantageous.It can be according to specification (delivery flow F, minimal circulation flow A and the liquid of liquid discharging head 3 and recording equipment master unit Channel impedance in body discharge head 3) come to select which loop configuration in the two loop configurations be preferred.

The explanation of the structure of liquid discharging head

Then, by the structure of prescribed liquid discharge head 3 for reference Fig. 4 A and 4B.Fig. 4 A is as from being formed with outlet 13 The perspective view for the liquid discharging head 3 that the side in face is watched, and Fig. 4 B is the perspective view from the side opposite with Fig. 4 A.Liquid Body discharge head 3 is 15 for recording liquid that cyan (C), magenta (M), yellow (Y) and black (K) this four colors can be discharged Recording element substrate 10 is arranged in a linear the row type liquid discharging head of (in-line arrangement layout).As shown in Figure 4 A, liquid discharging head 3 wraps Include 15 recording element substrates 10, flexible printed circuit board 40 and electric wiring base plates 90.Electric wiring base plates 90 are provided with defeated Enter terminal 91 and power supply terminal 92, wherein input terminal 91 and power supply terminal 92 are via electric wiring base plates 90 and soft Property the electrical connection of printed circuit board 40 to recording element substrate 10.Input terminal 91 and the electrical connection of power supply terminal 92 are extremely remembered The control circuit of recording apparatus 1000, and driving signal will be discharged respectively and required power supply is discharged to recording element base Plate 10.Wiring is integrated using the electric circuit in electric wiring base plates 90, this makes input terminal 91 and power supply terminal 92 quantity can be reduced compared with the quantity of recording element substrate 10.Make it possible to reduce in this way by 3 groups of liquid discharging head The quantity for the electric connection part for needing to dismantle when being filled to recording equipment 1000 or when replacing liquid discharging head 3.Such as Fig. 4 B institute Show, fluid connection 111 set by the both ends of liquid discharging head 3 is connected with the liquid-supplying system of recording equipment 1000. Therefore, the record liquid of CMYK this four colors is supplied from the feed system of recording equipment 1000 to liquid discharging head 3, and will The record liquid for having passed through liquid discharging head 3 is recycled to the feed system of all recording equipments 1000 waited as shown in figures 2 and 3.In this way, The record liquid of each color can be recycled via the path of recording equipment 1000 and the path of liquid discharging head 3.

Fig. 5 shows the exploded perspective view according to its function of each component and unit that constitute liquid discharging head 3.Liquid discharge First 3 have shell 80, and the shell 80 is equipped with liquid deliverying unit 300, fluid supply unit 220 and electric wiring base plates 90.Fluid connection 111 (referring to fig. 2~4B) is set to fluid supply unit 220, and in fluid supply unit 220 The foreign matter that for each open communication with fluid connection 111 removes in supplied record liquid of portion's setting for each color Filter 221 (referring to fig. 2 with 3).In configuration shown in Fig. 5, two liquid are set to a liquid discharging head 3 and supply list Member 220 and two vacuum cavitations units 230.In the liquid discharging head 3 shown in Fig. 2 and 3, two fluid supply units 220 are each From the filter 221 being provided with for two colors.The record liquid for having passed through filter 221 is supplied to corresponding liquid supply Set each vacuum cavitations unit 230 on unit 220.Each vacuum cavitations unit 230 has pressure adjustmenting mechanism, and leads to The effect of set valve and spring member etc. in excess pressure adjustment mechanism makes the fluctuation due to the flow of liquid and the note that occurs The variation of pressure decline in the feed system (feed system of the upstream side of liquid discharging head 3) of recording apparatus 1000 obviously declines Subtract.Therefore, vacuum cavitations unit 230 can make the downstream side (300 side of liquid deliverying unit) of these vacuum cavitations units 230 The variation of negative pressure is stablized in a certain range.As described above, for built in each vacuum cavitations unit 230 of each color, there are two pressures Power adjusts valve, and wherein these pressure-regulating valves are respectively arranged to different control pressure.On high-tension side pressure adjustmenting mechanism with Common feed path 211 in liquid deliverying unit 300 is connected to, and the pressure adjustmenting mechanism of low-pressure side and shared recovery approach 212 connections.

Shell 80, which is configured to, to be included liquid deliverying unit supporting member 81 and electric wiring base plates supporting member 82 and props up Liquid deliverying unit 300 and electric wiring base plates 90 are supportted, and ensure the rigidity of liquid discharging head 3.Electric wiring base plates support Component 82 is used to support electric wiring base plates 90, and is fixed by screwing to liquid deliverying unit supporting member 81. Liquid deliverying unit supporting member 81 is used to correct the warpage and deformation of liquid deliverying unit 300, and is consequently for ensuring multiple Thus the relative positional accuracy of recording element substrate 10 inhibits uneven in record object.Therefore, liquid deliverying unit supports structure Part 81 preferably has adequately rigidity.The example of suitable material includes the metal material and such as oxygen of stainless steel and aluminium etc. Change the ceramics etc. of aluminium etc..The both ends of the longitudinal direction of liquid deliverying unit supporting member 81, which have, inserts connector rubber component 100 opening 83 and 84.The liquid of the record liquid supplied from fluid supply unit 220 etc. passes through connector rubber component 100, And it is directed to the third channel component 70 described below as the component for constituting liquid deliverying unit 300.

Liquid deliverying unit 300 includes multiple discharge modules 200 and channel forms component 210, and list is discharged to liquid The face of the record-oriented medium of member 300 is installed by The lid component 130.The lid component 130 is that have to be provided with long opening 131 as shown in Figure 5 Frame-shaped surface component, wherein recording element substrate 10 and containment member 110 (Fig. 9 A) included in discharge module 200 Expose from opening 131.Frame portion around opening 131 has outlet with the formation for covering liquid discharging head 3 when noting down standby Face cap component used in contact surface.It is therefore preferable that in covering, by utilizing adhesive, sealant or noggin piece etc. The bumps on outlet face around coating opening 131 to fill liquid deliverying unit 300 form enclosure space with gap.

Then, it will illustrate that channel included in liquid deliverying unit 300 forms the structure of component 210.Channel forms structure Part 210 distributes the liquid of record liquid supplied from fluid supply unit 220 etc. to each discharge module 200, and makes The liquid being recycled for from discharge module 200 is back to fluid supply unit 220.It is by such as Fig. 5 institute that channel, which forms component 210, Show for first passage component 50, second channel component 60 and third channel component 70 to be sequentially laminated and be formed by object, and benefit It is screwed to liquid deliverying unit supporting member 81.Channel is inhibited to form the warpage and deformation of component 210 in this way.

Fig. 6 A~6F is to show the channel for constituting first passage component 50, second channel component 60 and third channel component 70 The figure of the front and back of component.Fig. 6 A shows the side for being equipped with the first passage component 50 of discharge module 200, and Fig. 6 F shows The face of third channel component 70 being in contact with liquid deliverying unit supporting member 81 out.Fig. 6 B shows first passage component 50 With the contact surface of second channel component 60, and Fig. 6 C shows the contact surface with first passage component 50 of second channel component 60. Equally, Fig. 6 D shows the contact surface with third channel component 70 of second channel component 60, and Fig. 6 E shows third channel structure The contact surface with second channel component 60 of part 70.By making second channel component 60 shown in Fig. 6 D and 6E and third channel structure The face of part 70 is engaged with each other, and is formed in the length of these channel components using common-use tunnel slot 62 and 71 is formed by the two 8 common-use tunnels extended on edge direction.It is formed to be formed in component 210 in channel in this way and be total to for respective one group of CMYK color With feed path 211 and shared recovery approach 212 (referring to Fig. 7).The communication port 72 and connector rubber structure of third channel component 70 Hole connection in part 100, to be connected to by fluidly connecting with fluid supply unit 220.In sharing for second channel component 60 Multiple communication ports 61 are formed on the bottom surface of channel slot 62, so that one end with the individual channel slot 52 of first passage component 50 connects It is logical.Communication port 51 is formed in the other end of the individual channel slot 52 of first passage component 50, thus by fluidly connecting via even Port 51 is connected to multiple discharge modules 200.These individual channel slots 52 enable these channels to be integrated into first passage structure The center side of channel component on the short side direction of part 50.In the following description, being total to for each color of record liquid is being indicated In the case where with feed path 211, instead of appended drawing reference 211, appended drawing reference 211a~211d will be used, and to indicate to remember In the case where the shared recovery approach 212 for recording each color of liquid, instead of appended drawing reference 212, will use appended drawing reference 212a~ 212d.Equally, in the case where to indicate individual feed path 213 of each color of record liquid, instead of appended drawing reference 213, Appended drawing reference 213a~213d will be used, and the case where to indicate individual recovery approach 214 of each color of record liquid Under, instead of appended drawing reference 214, appended drawing reference 214a~214d will be used.

First passage component~third channel the component 50,60 and 70 preferred pins for constituting channel formation component 210 are to record Liquid has corrosion resistance, and is made of the low material of linear expansion coefficient.The example of suitable material includes that aluminium oxide, liquid crystal are poly- Object (LCP) and composite material (resin material) are closed, wherein in these composite materials, to such as polyphenylene sulfide (PPS) or has been gathered The base-material of sulfone (PSF) etc. is added to the inorganic filler of silicon dioxide particles or fiber etc..Channel forms component 210 can be with It is to be formed by by making three channel components 50,60 and 70 be laminated and be bonded to each other using adhesive, or be somebody's turn to do in selection In the case where composite resin material used in material, these three channel components can be engaged by melting.

Then, the connection relationship in each channel in channel formation component 210 will be illustrated with reference to Fig. 7.Fig. 7 is such as from first Channel component 50 be equipped with discharge module 200 side watched, by making first passage component~third channel structure Part 50,60 and 70 engages the enlarged partial perspective view for being formed by the channel that channel is formed in component 210.Chain-dotted line in Fig. 7 Area encompassed is corresponding with configured with the region of recording element substrate 10.Channel forms component 210 to be had for each color Common feed path 211a~the 211d and shared recovery approach 212a~212d extended along the longitudinal direction of liquid discharging head 3. The multiple individual feed path 213a~213d for each color being made of individual channel slot 52 are connected to shared via communication port 61 Feed path 211a~211d.The multiple individual recovery approach 214a~214d for each color being made of individual channel slot 52 via Communication port 61 is connected to shared recovery approach 212a~212d.The channel design, which enables, records liquid from common feed path 211 are pooled at the recording element substrate 10 in the center of channel formation component 210 via individual feed path 213.May be used also Shared recovery approach 212 is recycled to via individual recovery approach 214 so that liquid will be recorded from recording element substrate 10.

Fig. 8, which is shown, to be formed component 210 along the channel of the line VIII-VIII of Fig. 7 and the cross section structure of module 200 is discharged. Fig. 8 shows individual recovery approach 214a and 214c and is connected to via communication port 51 with discharge module 200.Although Fig. 8 only shows individual Recovery approach 214a and 214c, but as shown in fig. 7, individual feed path 213 and discharge module 200 connect at different sections It is logical.10 institute of recording element substrate is formed in included supporting member 30 and recording element substrate 10 in discharge module 200 What is be arranged supplies from first passage component 50 to the channel of recording element 15 (referring to Figure 10 B) for that will record liquid.In addition, propping up It is formed in support component 30 and recording element substrate 10 for making to supply to part or all of recycling of the liquid of recording element 15 (recycling) is to the channel of first passage component 50.The common feed path 211 of each color connects via its fluid supply unit 220 It is connected to the on high-tension side pressure adjustmenting mechanism of the vacuum cavitations unit 230 of corresponding color.Equally, share recovery approach 212 via Fluid supply unit 220 is connected to the pressure adjustmenting mechanism of the low-pressure side of the vacuum cavitations unit 230 of corresponding color.Utilize negative pressure These pressure adjustmenting mechanisms in control unit 230 generate pressure between common feed path 211 and shared recovery approach 212 Power is poor.Therefore, in the liquid discharging head 3 that each channel connects as shown in FIG. 7 and 8, for each color, by common feed path 211 → individual feed path, 213 → recording element substrate 10 → individual recovery approach 214 → shares the sequence of recovery approach 212 It flows.

The explanation of module is discharged

Then, will illustrate that module 200 is discharged.Fig. 9 A shows the perspective view of a discharge module 200, and Fig. 9 B shows it Exploded view.Method for manufacturing discharge module 200 is as described below.Firstly, by recording element substrate 10 and flexible print circuit Plate 40 is pasted to the supporting member 30 for being pre-formed fluid connection mouth 31.Then, recording element substrate is made by wire bonding The electrical connection of terminal 16 on 10 covers lead using containment member 110 later to the terminal 41 on flexible printed circuit board 40 Joint portion (electric connection part) is to seal the wire bond.Flexible printed circuit board 40 relative to recording element substrate 10 Terminal 42 at the other end is electrically connected to the connection terminal 93 (Fig. 5) of electric wiring base plates 90.Supporting member 30 is for branch The supporting member of recording element substrate 10 is supportted, and still forms component by being fluidly coupled to recording element substrate 10 and channel The channel component being connected between 210, thus its flatness is high, and should be able to also highly reliably be bonded to recording element substrate 10.The example of the suitable material of supporting member 30 includes aluminium oxide and resin material.

The explanation of the construction of recording element substrate

Then, it will illustrate the structure of recording element substrate 10.Figure 10 A is that the formation of recording element substrate 10 has outlet 13 Side plan view, Figure 10 B is the enlarged drawing of part represented by the XB of Figure 10 A, and Figure 10 C is recording element substrate 10 The face relative to Figure 10 A the back side plan view.As shown in Figure 10 A, recording element substrate 10 is multiple with being formed with by row The outlet of outlet 13 forms component 12.Four face being formed with color as record liquid are formed on component 12 in outlet The corresponding four outlet rows of color CMYK.Note that the direction for below extending the outlet row for being arranged with multiple outlets 13 Referred to as " outlet line direction ".As shown in Figure 10 B, the recording element as the heater element to make liquid blister using thermal energy 15 are configured at position corresponding with outlet 13.The pressure chamber 23 comprising recording element 15 is separated using partition wall 22.Record Element 15 is electrically connected the terminal 16 into Figure 10 A using electric wiring (not shown) set by recording element substrate 10.Note Element 15 is recorded based on the control circuit from recording equipment 1000 via electric wiring base plates 90 (Fig. 5) and flexible printed circuit board 40 The pulse signal that (Fig. 9 B) is inputted is generated heat so that liquid boiling, to make the liquid boiling in pressure chamber 23.Due to Liquid is discharged from outlet 13 in the boiling and the foaming power generated.As shown in Figure 10 B, liquid supply passage 18 is along each discharge The side of mouth row extends, and liquids recovery channel 19 extends along the other side of each outlet row.18 He of liquid supply passage Liquids recovery channel 19 is the channel extended along the direction of outlet row set on recording element substrate 10, and respectively It is connected to via supply mouth 17a and recovery port 17b with outlet 13.

As shown in Figure 10 C and 11, sheet lid 20, which is laminated to, has outlet 13 relative to the formation of recording element substrate 10 On the back side in face, wherein the lid 20 is more with being connected to the liquid supply passage 18 and liquids recovery channel 19 that will be described later A opening 21.In example described herein, in lid 20, three openings 21 are set for each liquid supply passage 18, and For each liquids recovery channel 19, two openings 21 are set.As shown in Figure 10 B, the opening 21 of lid 20 and multiple companies shown in Fig. 6 A Port 51 is connected to.As shown in figure 11, lid 20, which is used as in the base main body 11 for constituting recording element substrate 10, is formed by liquid confession To the cover of a part in channel 18 and liquids recovery channel 19.20 preferred pin of lid has the liquid of record liquid etc. abundant Corrosion resistance must have high-precision about the opening shape of opening 21 and its position and from the viewpoint for preventing colour mixture.Cause , it is preferable to use photosensitive resin material or silicon plate are as material used in lid 20, split shed 21 is by photoetching process institute shape for this At.Thus, lid 20 is used to convert the spacing in channel using opening 21, and in view of pressure declines, and lid 20 is preferably thin , and be preferably made of photosensitive resin film.

Then, it will illustrate the flowing of the liquid in recording element substrate 10.Figure 11 is the face XI-XI shown along Figure 10 A The perspective view in the section of the recording element substrate 10 and lid 20 that are intercepted.Recording element substrate 10 is by being laminated by silicon (Si) structure At base main body 11 and the outlet that is made of photosensitive resin form component 12 and be formed by, middle cover 20 is bonded on substrate master On the back side of body 11.Recording element 15 (referring to Figure 10 B) is formed on another surface side of base main body 11, wherein in base main body The slot being made of the liquid supply passage 18 extended along outlet row and liquids recovery channel 19 is formed in 11 back side.Benefit The liquid supply passage 18 and liquids recovery channel 19 formed with base main body 11 and lid 20 is respectively connected to channel and forms component Common feed path 211 and shared recovery approach 212 in 210, and in liquid supply passage 18 and liquids recovery channel 19 Between there are differential pressures.Individual feed path 213 and individual recovery approach 214 are formed in first passage component 50.Individual supply Channel 213 connects liquid supply passage 18 and common feed path 211, and individual recovery approach 214 connects liquids recovery and leads to Road 19 and shared recovery approach 212.When multiple outlets 13 of liquid discharging head 3 are just being discharged liquid and are being recorded, do not having Have at the outlet for carrying out discharging operation, which makes the liquid in liquid supply passage 18 by supply mouth 17a → pressure chamber 23 The sequential flowing of → recovery port 17b, and flow to liquids recovery channel 19.The flowing is indicated by the arrow C in benefit in Figure 11.The stream It is dynamic to make it possible to record liquid, bubble and foreign matter after being thickened due to the vaporization of the solvent from outlet 13 etc. never just The outlet 13 and pressure chamber 23 recorded is recycled to liquids recovery channel 19.This also allows for inhibiting outlet 13 and pressure The thickening of record liquid at power room 23.The liquid for being recycled to the record liquid in liquids recovery channel 19 etc. is opening via lid 20 The fluid connection mouth 31 (referring to Fig. 9 B) of mouth 21 and supporting member 30, the communication port 51 formed in component 210 by channel, individual return What the sequence of receipts channel 214 and shared recovery approach 212 was recycled.The liquid recycled is finally recovered to recording equipment 1000 feed path.

That is, being supplied by supplying and recycling by sequential flowing as described below from the master unit of recording equipment 1000 To the liquid for recording liquid etc. to liquid discharging head 3.Firstly, fluid connection 111 of the liquid from fluid supply unit 220 Influent is discharged in head 3.Then, which is supplied to company set by connector rubber component 100, third channel component 70 Common-use tunnel slot 62 and communication port 61 set by port 72 and common-use tunnel slot 71, second channel component 60 and first logical Individual channel slot 52 and communication port 51 set by road component 50.Later, liquid is connected by liquid set by supporting member 30 Liquid supply passage 18 set by opening 21 set by port 31, lid 20 and base main body 11 and supply mouth 17a's is suitable Sequence is supplied to pressure chamber 23.It has supplied to pressure chamber 23 but not from the liquid of the discharge of outlet 13 by set by base main body 11 Recovery port 17b and liquids recovery channel 19, lid 20 set by fluid connection set by opening 21 and supporting member 30 The sequential flowing of mouth 31.Later, liquid is logical by communication port 51 set by first passage component 50 and individual channel slot 52, second Communication port 61 and common-use tunnel slot 62 set by road component 60, common-use tunnel slot 71 set by third channel component 70 and company The sequential flowing of port 72 and connector rubber component 100.The further liquid set by the fluid supply unit 220 of liquid Interconnecting piece 111 flow to the outside of liquid discharging head 3.In the case where using first circulation shown in Fig. 2 configuration, from liquid Then the liquid that body interconnecting piece 111 flows into is supplied to connector rubber component 100 by vacuum cavitations unit 230.Another party Face, in the case where using second circulation shown in Fig. 3 configuration, the liquid recycled from pressure chamber 23 passes through connector rubber structure Then part 100 flows out to outside liquid discharging head 3 via vacuum cavitations unit 230 from fluid connection 111.

In addition, all liq not flowed into from one end of the common feed path 211 of liquid deliverying unit 300 all via Individual feed path 213a is supplied to pressure chamber 23.As shown in Figures 2 and 3, exist even without the individual feed path of entrance The liquid of fluid supply unit 220 is flowed through in the case where 213a, from the other end of common feed path 211.Thus, liquid is set The channel flowed without via recording element substrate 10, this makes even if having flowing in recording element substrate 10 In the case where the big fine channel of impedance, it is also able to suppress the adverse current of liquid circulated.Therefore, liquid discharging head 3 can Inhibit the thickening in pressure chamber with the liquid of part near outlet, thus inhibit discharge deviation and is not discharged, thus result can To carry out high image quality record.

The explanation of positional relationship between recording element substrate

As described above, liquid discharging head 3 has multiple discharge modules 200.Figure 12 is in two adjacent discharge modules 200 Recording element substrate 10 adjacent part part amplification.As shown in Figure 10 A~10C, here, recording element substrate 10 by Shape is parallelogram.As shown in figure 12, the outlet row 14a~14d for being arranged with outlet 13 on recording element substrate 10 It is configured to tilt certain angle relative to the conveying direction L of recording medium.Make the adjacent portions of recording element substrate 10 as a result, Respectively outlet row at least one outlet be overlapped on the conveying direction L of recording medium.In Figure 12, on line D Two outlets 13 are in overlapped relationship.The layout is so that even if in the position of recording element substrate 10 relative to pre-determined bit It sets in the case where deviateing to a certain extent, can also make to record image by the drive control of overlapped outlet 13 In blackstreak and blank parts it is less obvious.Even if in multiple recording element substrates 10 linear (in-line arrangement) rather than being in It is interconnected be laid out in the case where, structure shown in Figure 12 also can be used.Thus, inhibiting liquid discharging head 3 remembering While length on the conveying direction of recording medium increases, it can cope with black at the lap between recording element substrate 10 Vitta line and blank parts.Although the shape of the interarea of recording element substrate 10 is parallelogram here, this is not limited Property.Even if the use of shape is rectangle, trapezoidal or other shapes of recording element substrate 10 in the case where, can also be suitably Using structure of the invention.

According to the explanation of the liquid discharge apparatus of the second topology example

The liquid discharge apparatus in above-mentioned first structure example can be not limited to using liquid discharge apparatus of the invention.With The ink jet recording device 1000 of lower the second topology example that will illustrate liquid discharge apparatus according to the present invention is (following to be also known as " recording equipment ") structure.Figure 13 is shown as according to the recording equipment 1000 of the liquid discharge apparatus of the second topology example Schematic construction.Note that the part that main explanation is different from first structure example, and will omit and be directed to and first structure example The explanation of identical part.

Recording equipment 1000 shown in Figure 13 and first structure it is exemplary the difference is that following point: by make respectively with One of CMYK color corresponding four monochromatic 3 arranged in parallel of liquid discharging head carry out panchromatic beat in recording medium 2 Print.Although the quantity in first structure example for outlet row workable for each color is 1 row, needle in the second topology example Quantity to outlet row workable for each color is multiple (being later 20 rows in Figure 20 A).Make it possible in this way It is distributed to multiple outlet rows by the way that data will be recorded and carries out the record of very high speed.Even if in the presence of the row for showing not to be discharged Outlet, utilizes the row of the corresponding position on the conveying direction L of the recording medium in the other rows being discharged in complementary fashion Outlet also improves reliability.Therefore, Industrial Printing etc. is suitble to according to the recording equipment 1000 of the second topology example.With with first The identical mode of topology example, feed system, buffer reservoir 1003 and the main liquid storage device 1006 of recording equipment 1000 pass through stream Body connects and is connected to liquid discharging head 3.Each liquid discharging head 3 is also electrically connected to for passing electric power and discharge control signal Transport to the electric control unit of liquid discharging head 3.It, can be in the second topology example in a manner of identical with first structure example Use any of the first circulation configuration being shown respectively of Fig. 2 and 3 and second circulation configuration.

The explanation of the construction of liquid discharging head

It will illustrate the construction of the liquid discharging head 3 according to the second topology example with reference to Figure 14 A and 14B.Figure 14 A be such as from It is formed with the perspective view for the liquid discharging head 3 that the side in the face of outlet is watched.Figure 14 B is the side opposite with Figure 14 A Perspective view.Liquid discharging head 3 has 16 recording element substrates 10 being arranged in a linear in its longitudinal direction, and being can The ink-jet row type liquid discharging head (page width type) recorded with the record liquid using a color.With with first structure example phase Same mode, liquid discharging head 3 have fluid connection 111, signal input terminal 91 and power supply terminal 92.However, by Become larger compared with the quantity of the outlet row in first structure example in the quantity of outlet row, therefore 91 He of signal input terminal Power supply terminal 92 can be configured at the two sides of liquid discharging head 3.This is to reduce set by the recording element substrate 10 Wiring portion at occur voltage decline and signal transmission delay.

Figure 15 is shown and is divided according to function according to the exploded perspective view of the liquid discharging head 3 of the second topology example Each component and unit of composition liquid discharging head 3 after solution.Liquid in the role and liquid discharging head 3 of these units and component The sequence and first structure example of body flowing are essentially identical, but ensure function that the rigidity of liquid discharging head is utilized not Together.In first structure example, the main rigidity for ensuring liquid discharging head using liquid deliverying unit supporting member 81, but In second topology example, ensure liquid discharging head using second channel component 60 included in liquid deliverying unit 300 Rigidity.In this second topology example, there is the liquid deliverying unit supporting member at the both ends for being connected to second channel component 60 81.The liquid deliverying unit 300 is mechanically engaged the position that liquid discharging head 3 has been thereby determined that the balladeur train of recording equipment 1000 It sets.Electric wiring base plates 90 and fluid supply unit 220 with vacuum cavitations unit 230 are bonded to the support of liquid deliverying unit Component 81.Filter (not shown) is built in the two fluid supply units 220.Second topology example is not configured as needle Two kinds of pressure controls are carried out to each vacuum cavitations unit 230.A vacuum cavitations unit in two vacuum cavitations units 230 230 are configured to control pressure with relatively high negative pressure, to be used as on high-tension side vacuum cavitations unit, and another negative Pressure control unit 230 is configured to control pressure with relatively low negative pressure, to be used as the vacuum cavitations unit of low-pressure side. Two in the longitudinal direction of liquid discharging head 3 are configured in the vacuum cavitations unit 230 of as shown in figure 15, high-pressure side and low-pressure side In the case where end, along the common feed path 211 and shared recovery approach 212 of the longitudinal direction extension of liquid discharging head 3 The mobile phase of liquid is mutually opposite.The heat exchange between common feed path 211 and shared recovery approach 212 is promoted in this way, by This can reduce the temperature difference between the two common-use tunnels.This is advantageous in the following areas: along common feed path Temperature difference is less likely to occur between 211 and multiple recording element substrates 10 of the configuration of shared recovery approach 212, therefore is not easy to send out The raw record generated due to temperature difference is uneven.

Then, the channel that will be explained in liquid deliverying unit 300 forms component 210.It is such as figure that channel, which forms component 210, The first passage component 50 and second channel component 60 that are laminated shown in 15, and will be supplied from fluid supply unit 220 The liquid of record liquid etc. is distributed to discharge module 200.Channel forms component 210 and also serves as making from discharge module 200 The liquid of recycling is back to the recovery approach component of fluid supply unit 220.The second channel component of channel formation component 210 60 be to form the component of common feed path 211 and shared recovery approach 212, and go back principal security liquid discharging head 3 Rigidity.It is therefore preferable that the material of second channel component 60 has sufficient corrosion resistance for the liquid of record liquid etc., and And there is high mechanical strength.The example of suitably used material includes stainless steel, titanium (Ti) or aluminium oxide etc..

Then, the details of first passage component 50 and second channel component 60 will be illustrated with reference to Figure 16 A~16E.Figure 16 A Show first passage component 50 be equipped with discharge module 200 side face, and Figure 16 B be show Figure 16 A face (with What second channel component 60 was in contact) figure at the back side.The case where different from first structure example, according to the of the second topology example One channel component 50 is the configuration that multiple components corresponding with discharge module 200 are adjacent to arrangement.Made using the segmenting structure Length corresponding with length needed for liquid discharging head 3 can be realized by arranging multiple this modules by obtaining.For example, the knot Structure is particularly suited for use in and JIS (Japanese Industrial Standards, Japanese Industrial Standards) B2 size and even In the corresponding relatively long liquid discharging head of larger sized thin slice.As shown in Figure 16 A, the connection of first passage component 50 Mouth 51 is connected to by fluidly connecting and being discharged module 200, and as shown in fig 16b, the individual communication port of first passage component 50 53 are connected to by fluidly connecting with the communication port 61 of second channel component 60.Figure 16 C show second channel component 60 with first The face that channel component 50 is in contact, Figure 16 D show the section that the through-thickness of the central portion of second channel component 60 is intercepted, And Figure 16 E is the figure for showing the face of second channel component 60 being in contact with fluid supply unit 220.Second channel component 60 Channel and communication port function with the record liquid of a color in first structure example the case where it is identical.Second channel component One of them is common feed path 211 shown in Figure 17 to 60 common-use tunnel slot 71, and the other is shares recovery approach 212, wherein being supplied to liquid from one end side to another side in the longitudinal direction of each comfortable liquid discharging head 3 of the two.It is different In the first structure example the case where, in the topology example, for the liquid of common feed path 211 and shared recovery approach 212 The direction of the flowing of body is mutually opposite direction in the longitudinal direction of liquid discharging head 3.

Figure 17, which is shown, forms the related connection relationship in each channel between component 210 recording element substrate 10 and channel. As shown in figure 17, one group common feed being provided with along the longitudinal direction of liquid discharging head 3 extend is formed in component 210 in channel Channel 211 and shared recovery approach 212.61 respective positions of communication port of second channel component 60 and first passage component 50 The position alignment of the individual communication port 53 and communication port 61 of second channel component 60 is each attached to first passage component 50 Individual communication port 53 is consequently formed from the communication port 72 of second channel component 60 and leads to via common feed path 211 towards first The liquid supply path of the communication port 51 of road component 50.Equally, the communication port 72 from second channel component 60 is also formed via altogether With recovery approach 212 towards 51 liquid supply path of communication port of first passage component 50.

Figure 18 is the figure shown along the section intercepted the XVIII-XVIII of Figure 17.Figure 18 shows common feed path How 211 be connected to discharge module 200 via communication port 61, individual communication port 53 and communication port 51.Although not showing in Figure 18 Out, but from Figure 17 it can be clearly seen that another section, which will be shown, is connected to sharing back for discharge module 200 via same paths Receive channel 212.In a manner of identical with first structure example, discharge module 200 and recording element substrate 10 on formed to The channel being connected to the pressure chamber 23 for being formed with outlet 13.Using these channels, the liquid that is supplied part or all It is recycled via pressure chamber 23 corresponding with the outlet 13 of discharging operation is not just carried out.With with first structure example Identical mode, via fluid supply unit 220, common feed path 211 is connected on high-tension side vacuum cavitations unit 230, And share the vacuum cavitations unit 230 that recovery approach 212 is connected to low-pressure side.Therefore, it is produced using vacuum cavitations unit 230 Raw differential pressure produces from common feed path 211 via the pressure chamber 23 of recording element substrate 10 and flows to shared recovery approach 212 flowing.

The explanation of module is discharged

Then, by explanation according to the discharge module 200 of the second topology example.Figure 19 A is the perspective view that module 200 is discharged, And Figure 19 B is its exploded view.It is exemplary with first structure the difference is that following point: multiple terminals 16 are configured at along note Record the both sides (long leg of recording element substrate 10) in the direction of multiple outlet rows of device substrate 10.On the other hand: Xiang Yi Two flexible printed circuit boards 40 are arranged in a recording element substrate 10, and the electrical connection of the two flexible printed circuit boards 40 is extremely Terminal 16.Its reason is: the quantity of set outlet row is, for example, 20 rows on recording element substrate 10, this is relative to the 4 rows in one topology example increased.That is, it is therefore an objective to make correspondingly to set from terminal 16 until with outlet row Maximum distance until the recording element 15 set is kept as short, thus reduces in recording element substrate 10 set wiring portion The voltage decline and signal transmission delay that place occurs.The fluid connection mouth 31 of supporting member 30 is set to recording element substrate 10, And these fluid connection mouths 31 are open in a manner of across all outlet rows.Other points are identical as first structure example.

The explanation of the construction of recording element substrate

Then, by explanation according to the structure of the recording element substrate 10 of the second topology example.Figure 20 A is to show recording element The plan view in the face of the side configured with outlet 13 of substrate 10, Figure 20 B are to show to be formed with liquid supply passage 18 and liquid The figure of the part of body recovery approach 19, and Figure 20 C is the plan view for showing the back side in face shown in Figure 20 A.Figure 20 B is to show In the state of removing lid 20 set by the back side of recording element substrate 10 in Figure 20 C, the face of recording element substrate 10 Schematic diagram.As shown in fig. 20b, at the back side of recording element substrate 10, it is logical that liquid supply is arranged alternately along outlet line direction Road 18 and liquids recovery channel 19.Although the quantity of outlet row is much bigger compared with first structure example, with first structure Exemplary essential difference is: as described above, terminal 16 is configured at the both sides of recording element substrate 10 along outlet line direction Portion.Such as such as the following basic structure is identical as the basic structure in first structure example: being arranged one group for each outlet row Liquid supply passage 18 and liquids recovery channel 19 and being arranged to lid 20 is connected to the fluid connection mouth 31 of supporting member 30 Opening 21 etc..

Below illustrate it is related with liquid discharging head or liquid discharge apparatus it is according to the present invention can be discharged characteristic not Control is since high-temp liquid is to heating caused by pressure chamber's adverse current in the case where change.Figure 21 is shown according to embodiments of the present invention Liquid discharging head 3 liquid deliverying unit 300.According to shell 80, the electric wiring base plates of the liquid discharging head 3 of the present embodiment The structures such as 90 and fluid supply unit 220 are identical as the structure described in Fig. 1~20C, therefore will omit the description below.Such as It is described below, instead of vacuum cavitations unit is arranged, the control of negative pressure is carried out by using head pressure.For ease of description, Liquid discharging head 3, which will be described as having, is used to be discharged two outlet rows of the liquid of same color.

In the liquid deliverying unit 300 shown in Figure 21, as described above, multiple supporting members 30, which are bonded to channel, forms structure Furthermore part 210 is directed to each supporting member 30, is bonded to recording element substrate 10.Figure 22 is to be shown specifically liquid deliverying unit 300 Exploded perspective view, the discharge module including supporting member 30 and recording element substrate 10 is shown.Figure 22 shows composition record The base main body 11 for being divided into 2 in a thickness direction of device substrate 10.One partitioning portion is in (a) of Figure 22 with engagement To outlet formed component 12 state be shown, and another partitioning portion in (b) of Figure 22 with liquid supply passage 18 and liquids recovery channel 19 expose state be shown.In Figure 22, lid 20 (c) is shown, and supporting member (d) is shown 30。

Component 210 is formed for channel according to the supporting member 30 of the present embodiment and supports recording element substrate 10, and also For the liquid for recording liquid etc. to be formed the distribution of component 210 to recording element substrate 10 from channel.The setting of lid 20 is recording On the face opposite with the face for being formed with outlet 13 of device substrate 10, but the situation high in the formed precision of supporting member 30 Under, lid 20 can be integrally formed with supporting member 30.Lid 20 has for from supporting member 30 to recording element substrate 10 Multiple fine openings that the spacing of fluid passage is converted.In these openings, it will be opened with what liquid supply passage 18 was connected to Mouth is known as supply side opening 21a, and the opening being connected to liquids recovery channel 19 is known as to recycle side opening 21b.In Figure 21 Shown in configuration, channel is set for all recording element substrates 10 set by liquid discharging head 3 and forms component 210, but also can be configured to: multiple channels formed components 210 respectively with a multiple or recording element substrate 10 correspondingly Setting.In addition, multiple recording element substrates can also be directed to although supporting member 30 is arranged for each recording element substrate 10 10 one supporting member 30 of setting.

The supply side assignment channel 318 and recycling side assignment channel 319 of slit-shaped hang down along the direction extended with outlet row Straight direction is formed on supporting member 30.Assignment channel 318 and 319 connects with the liquid in structure shown in Fig. 9 B and 19B Port 31 is corresponding.Supply side assignment channel 318 is for liquid to be formed to the common feed path in component 210 from channel 211 distribute and supply to the path of recording element substrate 10, and are connected to common feed path 211.Equally, recycling side distribution Channel 319 is for liquid to be recycled to the shared recovery approach 212 that channel is formed in component 210 from recording element substrate 10 Path, and be connected to shared recovery approach 212.Set supply side opening 21a setting is logical in supply side distribution in lid 20 At the position that road 318 and liquid supply passage 18 intersect, so that supply side assignment channel 318 and liquid supply passage 18 connect It is logical.Equally, at the position that recycling side assignment channel 319 is arranged in recycling side opening 21b and liquids recovery channel 19 intersects, so that Side assignment channel 319 must be recycled to be connected to liquids recovery channel 19.Liquid supply passage 18 and liquids recovery channel 19 are by conduct Along the direction that outlet row extends extended be parallel to each other slot and be formed in base main body 11 be formed with outlet 13 The opposite face in face on.

Figure 23 is the exploded perspective view for recording element substrate 10 to be described in detail.(A) of Figure 23, which is shown, is formed with discharge Mouthfuls 13 part, (B) of Figure 23 show the part for being formed with pressure chamber 23, supply mouth 17a and recovery port 17b, and Figure 23 (C) base main body 11 for being formed with liquid supply passage 18 and liquids recovery channel 19 is shown.For ease of description, only show here An outlet row out.Figure 24 A and 24B are for illustrating pressure chamber 23 and outlet 13.Figure 24 A is to show from outlet 13 to watch Recording element substrate 10 inside state plan view, and Figure 24 B is intercepted along the line XXIVB-XXIVB of Figure 24 A Sectional view.It will illustrate the liquid discharging head 3 according to the present embodiment with reference to Figure 22~24B.Recording element 15 is with such as Figure 23~24B The shown mode in face of outlet 13 is arranged on the surface of base main body 11, wherein between outlet 13 and recording element 15 Region is pressure chamber 23.Although in base main body 11 be provided with multiple recording elements 15, adjacent recording element 15 it Between configure partition wall 22 to be separated between pressure chamber 23.Therefore, a recording element 15 and an outlet 13 are corresponding In a pressure chamber 23.Supply mouth 17a and recovery port 17b respectively be formed in as slot on the opposing face of base main body 11 Liquid supply passage 18 is connected to liquids recovery channel 19.

As shown in (c) of Figure 22, the multiple supply side opening 21a being connected to liquid supply passage 18 are formed on lid 20 Row, and the multiple recycling side opening 21b being connected to liquids recovery channel 19 form row on lid 20.The supply side of slit-shaped point It is formed on supporting member 30 with channel 318 and recycling side assignment channel 319, is opened respectively with supply side opening 21a and recycling side Mouth 21b connection.The supply side assignment channel 318 and recycling side assignment channel 319 of slit-shaped and channel form institute's shape on component 210 At common feed path 211 be connected to shared recovery approach 212.In the following description, the supply side opening 21a of lid 20 is also wrapped It includes in supply side assignment channel 318, and recycles side opening 21b and be also included in recycling side assignment channel 319.

By explanation according to the flowing of the liquid of the record liquid of the liquid discharging head 3 of the present embodiment etc..Illustrating liquid Be discharged head 3 liquid flowing before, by with reference to Figure 25 come illustrate the liquid discharge apparatus according to the present embodiment structure it is general It wants.Liquid discharging head 3 is provided with the inflow entrance 307b and stream of on high-tension side inflow entrance 307a and outflux 310a and low-pressure side Export 310b.Common feed path 211 is connected between the inflow entrance 307a in liquid discharging head 3 and outflux 310a, and Recovery approach 212 is shared to be connected between inflow entrance 307b and outflux 310b.Inflow entrance 307a and 307b be each attached to The buffer reservoir 308a and 308b that atmosphere is connected.On the other hand, outflux 310a and outflux 310b are respectively via constant current Pump 311a and 311b is connected to buffer reservoir 308a and 308b.Buffer reservoir 308a and 308b each serve as storage liquid The storage element of (being in this case record liquid).In the liquid discharge apparatus, for buffer reservoir 308a and 308b The path of each self-forming liquid circulation, these paths are respectively connected to common feed path 211 described below and share recycling Channel 212.Therefore, the path for being connected to common feed path 211 is known as first circulation system, and will be connected to and shares back The path for receiving channel 212 is known as second circulation system.

Main liquid storage device 314 is set supplying liquid to buffer reservoir 308a and 308b.Pump 312a and valve 313a sequentially It is arranged between main liquid storage device 314 and buffer reservoir 308a, and pumps 312b and valve 313b and be sequentially arranged in main liquid storage device 314 Between buffer reservoir 308b.Liquid level sensor 309a and 309b are installed to buffer reservoir 308a and 308b, and are controlled Device 315 controls pump 312a and 312b and valve 313a and 313b based on sensor signal.By the control of controller 315 by Pressure difference control between inflow entrance 307a and inflow entrance 307b is desired value, and be may be implemented and liquid described in Fig. 1~20C The equivalent function of the vacuum cavitations unit 230 that body is discharged in head 3.To the pressure difference between inflow entrance 307a and inflow entrance 307b into Row setting, so that record liquid flows through pressure chamber 23 with the flow velocity of the mm/s of several mm/s~tens.

Figure 26 A and 26B is shown using arrow to be watched from 211 side of common feed path and 212 side of shared recovery approach Common feed path 211, the flowing for sharing recovery approach 212 and the liquid in assignment channel 318 and 319.Figure 26 A show as Lower content: the liquid for flowing through pressure chamber 23 flows through supply side assignment channel 318 from common feed path 211, in pressure chamber 23 Circulation, and shared recovery approach 212 is expelled to via recycling side assignment channel 319.It is being directed to pressure chamber in this way 23 and make to drive in the state of liquid circulation under the recording status of recording element 15, as shown in fig. 26b, in order to from 13 row of outlet Out, liquid is flowed from supply mouth 17a and recovery port 17b towards pressure chamber 23.At this point, due to circulation and pass through pressure chamber 23 and The liquid for flowing out to recycling side assignment channel 319 is flowed towards outlet 13, and is discharged.Therefore, side assignment channel is recycled The amount of liquid in 319 reduces, but liquid is supplied to recycling side assignment channel 319 from shared recovery approach 212 and is somebody's turn to do with compensating Phenomenon.

Now, liquid discharging head 3 be warming up to recording element substrate 10 the temperature control of steady temperature, with inhibit by The temperature change of the head caused by driving and maintain good record quality.Rise simultaneously quilt in the temperature of liquid discharging head 3 In the state of control, liquid is heated up by flowing through the channel in recording element substrate 10, and the liquid after heating is flow to back It receives in side assignment channel 319.Once liquid discharging head 3 enters record operation, then as described above, will be warmed during circulation Liquid is from the supply of recycling side assignment channel 319 to outlet 13, therefore the temperature near outlet 13 rises.What is be continuously discharged In the extended situation of state, recycle side assignment channel 319 in heating ink gradually from recording element substrate 10 be discharged, and from return Side assignment channel 319 is received to supply the ink that do not heat up.Therefore, the temperature for recycling the liquid in side assignment channel 319 reduces, and arranges Temperature near outlet 13 also reduces, and is finally reached normal temperature.

In order to inhibit the phenomenon, so that the liquid being formed in as slot in the base main body 11 of recording element substrate 10 The flow impedance of recovery approach 19 is greater than the flow impedance of liquid supply passage 18.Now, it will be considered that supply to pressure chamber 23 The amount of liquid.In the following description, R_inIndicate the synthesis flow impedance of supply mouth 17a and liquid supply passage 18, and R_outTable Show the resultant impedance of recovery port 17b and liquids recovery channel 19.Q is indicated in the full discharge shape from all outlets 13 discharge liquid What is be discharged under state is converted into the amount of flow, and q indicates the flow of the liquid recycled when not being discharged via pressure chamber 23. Expression formula (1) below indicate the driving condition in liquid discharging head 3 from it is non-discharge change into discharge when from liquids recovery channel 19 supply to the flow Q of the liquid of pressure chamber 23_out。

From expression formula (1) as can be seen that the flow impedance if fruit structure is liquids recovery channel 19 is logical greater than liquid supply The flow impedance in road 18 is then reduced in discharge from the supply of liquids recovery channel 19 to the amount of the liquid of pressure chamber 23.Therefore, may be used The adverse current of the liquid in liquids recovery channel 19 to reduce the variation of the driving condition along with liquid discharging head 3, can press down The temperature of liquid in pressing pressure room 23 temporarily becomes excessively high state, and record quality can be maintained high level.It can For example, by being greater than the area of section of the plane vertical with the flow direction of the liquid in liquid supply passage 18 and liquid The area of section of the vertical plane in the flow direction of liquid in body recovery approach 19 hinders the flowing in liquids recovery channel 19 The anti-flow impedance for being disposed higher than liquid supply passage 18.

It will illustrate the liquid discharging head 3 according to the present embodiment based on several examples and comparative example below.Figure 27 is schematic The vertical with the flow direction of liquid supply passage 18 of the base main body 11 of first exemplary recording element substrate 10 is shown to cut Face.Figure 28 schematically shows the section of recording element substrate 10 as the first comparative example.

First example and the first comparative example

As the first example, as shown in figure 27, by changing the width in channel, the section in liquids recovery channel 19 has been manufactured Area is the recording element substrate 10 of the one third of the area of section of liquid supply passage 18.Therefore, with supply mouth 17a and liquid The synthesis flow impedance of body feed path 18 is compared, and the synthesis flow impedance in recovery port 17b and liquids recovery channel 19 is 4 times Greatly.

As the first comparative example, as shown in figure 28, by keeping the width in channel identical with depth, it is logical liquids recovery is manufactured The recording element substrate 10 identical with the area of section of liquid supply passage 18 of road 19.

About 300Pa is set by the pressure difference between buffer reservoir 308a and 308b, so that liquid will be with 10mm/s Flow velocity flow through width be 30 μm and a height of 15 μm of pressure chamber 23.The record liquid for using ink-jet record to use is arranged as supply to liquid Lift one's head 3 liquid.By the temperature control of the record liquid supplied for 35 DEG C, for recording element substrate 10 carry out temperature control with So that it is 60 DEG C that the temperature sensor (not shown) that pressure chamber 23 is nearby configured, which is all read, and make liquid discharging head 3 Temperature Distribution becomes equilibrium state.In the equilibrium state, with the driving frequency of 8000Hz and 5 × 10^-15m³Discharge rate It drives the liquid discharging head 3 according to the first example and the first comparative example, and calculates being averaged for record liquid in pressure chamber 23 The time change of temperature.Figure 29 is shown as a result, wherein solid line indicates the first example, and dotted line indicates the first comparative example.

In the first comparative example, 4 times of record liquid of the amount of the record liquid about recycled due to pressure difference has been discharged, because The temperature in pressure chamber 23 temporarily becomes high temperature record liquid adverse current in this liquids recovery channel 19 into pressure chamber 23, and therefore It obtains excessively high.On the other hand, recovery port 17b and the synthesis flow impedance in liquids recovery channel 19 are about supply mouth 17a and liquid supplies To 4 times of the synthesis flow impedance in channel 18, therefore according to expression formula (1), recorded from the high temperature of 19 adverse current of liquids recovery channel The flow of liquid is reduced to about 2/5ths.Therefore, compared with the first comparative example, the first example inhibits the record in pressure chamber 23 The temperature of liquid rises.

Therefore, change the shape that liquids recovery channel 19 is formed by base main body 11 to increase flow impedance, this makes The temperature that the liquid in pressure chamber 23 must be able to suppress rises, therefore can manufacture the high liquid discharging head 3 of record quality.At this In embodiment, so that the flow impedance in liquids recovery channel 19 is about 4 times of the flow impedance of liquid supply passage 18, but this hair It is bright without being limited thereto, as long as and meeting the synthesis flow impedance in recovery port and liquids recovery channel greater than supply mouth and liquid confession To the synthesis flow impedance in channel, this relationship is sufficient.

Second example

Second example focuses on the synthesis flow impedance, recovery port 17b and liquid of supply mouth 17a and liquid supply passage 18 Between the synthesis flow impedance of recovery approach 19, discharge rate Q and the flow q of the liquid recycled via pressure chamber 23 when not being discharged Relationship.It is aobvious from the flow of the high-temp liquid of 19 adverse current of liquids recovery channel since this tittle meets aftermentioned expression formula (4) It writes and reduces.Note that discharge rate Q is indicated from including drop that all outlets 13 in fluid removal head 3 are discharged here The summation of drop amount.

Based on expression formula (1), flow when discharge from the supply of liquids recovery channel 19 to the liquid of pressure chamber 23 becomes real The condition (that is, not condition countercurrently) that matter is 0 is such as shown in following formula (2).

However, the situation that more liquid are recycled via pressure chamber 23 compared with the amount of liquid being discharged when not being discharged Under, there are following situations: the uneven of pressure distribution in channel increases since pressure declines, this leads to that characteristic is discharged not It is balanced.Therefore, as shown in expression formula below (3), the internal circulating load of liquid needs to be less than the flow of liquid be discharged.

Q < Q ... (3)

Therefore, from expression formula (2) and (3) as can be seen that expression formula (4) below needs to set up as significantly subtracting It is few avoid being discharged caused by declining due to pressure in the case where the flow of the high-temp liquid of 19 adverse current of liquids recovery channel it is special The unbalanced condition of property.

In a second embodiment, liquid deliverying unit 300 identical with first embodiment shown in Figure 27 has been used.It will pressure Flow velocity in power room 23 is set as 60mm/s to meet the condition of expression formula (4), and by buffer reservoir 308a and 308b it Between pressure difference be set as about 1800Pa to realize the flow velocity.In the state of with the first example balance under the same conditions, With the driving frequency of 8000Hz and 5 × 10^-15m³Discharge rate come drive according to the liquid of the second example and the first comparative example be discharged First 3, and calculate the time change of the mean temperature for recording liquid in pressure chamber 23.Figure 30 is shown as a result, wherein solid line indicates Second example, and dotted line indicates the first comparative example.

In the second example, the flow of the fluid recycled when not being discharged via pressure chamber 23 meets the condition of expression formula (4), Therefore any high-temp liquid is hardly from 19 adverse current of liquids recovery channel.On the other hand, in the first comparative example, when not being discharged The flow q of the fluid recycled via pressure chamber 23 is about the half of the value on the right side of expression formula (4), therefore is unsatisfactory for expression formula (4) Condition.As can be seen from Figure 30, compared with the first comparative example, and further compared with the first example, the second example inhibits Temperature in pressure chamber 23 rises.Therefore, it is possible to produce the high liquid discharging head of record quality.

Although the negative pressure generated between high-pressure side and low-pressure side has been described using head difference in the present embodiment, Configuration for generating and controlling negative pressure is not limited to this.Vacuum cavitations unit equal shown in Fig. 1~20C can be used. In addition, although it have been described that the temperature near monitoring pressure chamber 23 is to inhibit to cause due to the temperature change in negative pressure chamber 23 Discharge characteristic variation, so that the temperature of the liquid in pressure chamber 23 maintains the configuration in set range, but The present invention is also the same effective using other heater configurations.

According to the present invention it is possible to a kind of liquid discharging head and the liquid discharge apparatus using the liquid discharging head are provided, by This can realize the liquid circulation for being directed to pressure chamber in the case where not making to be discharged characteristic changing, and inhibit due to high-temperature liquid Body is countercurrently to heating excessively caused by pressure chamber.

While the present invention has been described with reference to the exemplary embodiments, it should be appreciated that, the present invention is not limited to disclosed Exemplary embodiments.The scope of the appended claims meets widest explanation, to include all such modifications, equivalent structure and function Energy.

Claims (13)

1. a kind of liquid discharging head, comprising:

Multiple recording elements, for generating the energy liquid is discharged,

It is characterized by further comprising:

Recording element substrate has the first face for being provided with multiple recording elements；

Outlet, for liquid to be discharged；And

Pressure chamber, internal includes the recording element,

Wherein, the recording element substrate includes

Liquid supply passage is connected to multiple pressure chambers, and is formed in of the opposite side as first face On two faces,

Liquids recovery channel is connected to multiple pressure chambers, and is formed on second face,

Supply mouth is connected to the pressure chamber and the liquid supply passage, and

Recovery port is connected to the pressure chamber and the liquids recovery channel,

Wherein, liquid is successively flowed via the supply mouth, the pressure chamber and the recovery port from the liquid supply passage To the liquids recovery channel, and

Wherein, the synthesis flow impedance of the liquids recovery channel and the recovery port is greater than the liquid supply passage and described The synthesis flow impedance of supply mouth.

2. liquid discharging head according to claim 1, wherein

Area of section of the liquid supply passage at the plane vertical with the flow direction of liquid is greater than the liquids recovery Area of section of the channel at the plane vertical with the flow direction of liquid.

3. liquid discharging head according to claim 1 or 2, wherein

It sets up,

Wherein, Q indicates the liquid being discharged when liquid is discharged from all outlets being connected to the liquid supply passage Flow；Q indicates under the standby mode without the discharge of liquid to flow to from the supply mouth via the pressure chamber described The flow of the liquid of recovery port；R_inIndicate the synthesis flow impedance of the liquid supply passage and the supply mouth；And R_outTable Show the synthesis flow impedance of the liquids recovery channel and the recovery port.

4. liquid discharging head according to claim 1 or 2, wherein further include:

Channel component is arranged with multiple recording element substrates,

Wherein, the channel component includes:

Common feed path is connected to the liquid supply passage, and

Recovery approach is shared, is connected to the liquids recovery channel.

5. liquid discharging head according to claim 4, wherein

Liquid according to the pressure difference between the common feed path and the shared recovery approach, in the common feed path A part of body flows through the pressure chamber from the liquid supply passage, reaches the liquids recovery channel, and flow to institute State shared recovery approach.

6. liquid discharging head according to claim 1 or 2, wherein

The liquid supply passage and the liquids recovery channel are upwardly extended in the side along first face, and the confession It is upwardly extended to mouth and the recovery port in the side intersected with first face.

7. liquid discharging head according to claim 1 or 2, wherein

Multiple supply mouths are connected to the liquid supply passage and multiple recovery ports and the liquids recovery channel Connection.

8. liquid discharging head according to claim 1 or 2, wherein

Second face of the recording element substrate, which is provided with, constitutes the liquid supply passage and the liquids recovery channel A part lid.

9. liquid discharging head according to claim 8, wherein

The lid includes:

Side opening is supplied, is connected to the liquid supply passage, and

Side opening is recycled, is connected to the liquids recovery channel.

10. liquid discharging head according to claim 8, wherein

The lid is made of resin film.

11. liquid discharging head according to claim 1 or 2, wherein

The recording element substrate further include:

Outlet forms component, with the outlet, and

Base main body, with the recording element.

12. liquid discharging head according to claim 1 or 2, wherein

The indoor liquid of pressure recycles between the inside of the pressure chamber and the outside of the pressure chamber.

13. a kind of liquid discharge apparatus characterized by comprising

Liquid discharging head comprising:

Recording element substrate, has the first face for being provided with multiple recording elements, and multiple recording elements are used for generating The energy of liquid is discharged,

Outlet, for liquid to be discharged,

Pressure chamber, internal includes the recording element,

Liquid supply passage is connected to multiple pressure chambers, and is formed in of the opposite side as first face On two faces,

Liquids recovery channel is connected to multiple pressure chambers, and is formed on second face,

Supply mouth is connected to the pressure chamber and the liquid supply passage, and

Recovery port is connected to the pressure chamber and the liquids recovery channel；

Storage element, for storing liquid；And

Liquid transfer unit is used for supply and withdrawal liquid between the storage element and the liquid discharging head,

Wherein, liquid is successively flowed via the supply mouth, the pressure chamber and the recovery port from the liquid supply passage To the liquids recovery channel, and

The synthesis flow impedance of the liquids recovery channel and the recovery port is greater than the liquid supply passage and the supply The synthesis flow impedance of mouth.