JP2002067330A - Ink-jet recording head and its manufacturing method - Google Patents

Ink-jet recording head and its manufacturing method

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Publication number
JP2002067330A
JP2002067330A JP2001181597A JP2001181597A JP2002067330A JP 2002067330 A JP2002067330 A JP 2002067330A JP 2001181597 A JP2001181597 A JP 2001181597A JP 2001181597 A JP2001181597 A JP 2001181597A JP 2002067330 A JP2002067330 A JP 2002067330A
Authority
JP
Japan
Prior art keywords
ink
recording head
base plate
jet recording
ink supply
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2001181597A
Other languages
Japanese (ja)
Inventor
Koichi Komata
Hirotaka Miyazaki
Takeshi Okazaki
Akira Shimamura
Shunichi Watabe
浩孝 宮崎
好一 小俣
猛史 岡崎
亮 嶋村
俊一 渡部
Original Assignee
Canon Inc
キヤノン株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2000-180344 priority Critical
Priority to JP2000180344 priority
Application filed by Canon Inc, キヤノン株式会社 filed Critical Canon Inc
Priority to JP2001181597A priority patent/JP2002067330A/en
Publication of JP2002067330A publication Critical patent/JP2002067330A/en
Pending legal-status Critical Current

Links

Abstract

(57) [Problem] To provide a configuration that ensures straightness in the longitudinal direction without increasing the number of parts and does not hinder the recovery operation. A base plate (1) made of carbon graphite and a first ink supply member (4) are fixed by screws (5a) so as to be in close contact with each other at a fulcrum (30). HB2, which is a heater board made of silicon, is supported on the HB surface 32 of the base plate 1, and the top plate 3 made of silicon is in close contact with the HB2 at the top plate surface 34 of the first ink supply member 4. Is being pressed. First ink flow path 17 of first ink supply member 4
Communicates with the common liquid chamber of the top plate 3. Base plate 1
And the blade surface 4a of the first ink supply member 4 are coated with a water repellent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applicable not only to printers used in offices but also to printers for printing on a recording medium such as a cloth or a coloring substrate for a color filter. The present invention relates to a head ink jet recording head applicable to an ink jet recording head and a method of manufacturing the ink jet recording head. In particular, the present invention relates to an ink jet recording head having a longer ejection energy generating element substrate and a method for manufacturing the ink jet recording head.

[0002]

2. Description of the Related Art The structure of a conventional ink jet recording head which has been made longer is almost the same as that of a conventional relatively short ink jet recording head.
As shown in FIG. 8, a heater board 204 having a discharge energy generating element (not shown) such as an electrothermal transducer is mounted on a base plate 106, and a fine groove pattern is formed thereon. Are further mounted, and the heater board 204 and the top plate 205 are bonded together, or pressed by a spring unit through a top plate joining process. As shown in FIG. 9, the top plate 205 has a SUS rod penetrated to ensure straightness in the longitudinal direction.

[0003] Ink supplied through a filter (not shown) for removing dust and the like provided in the supply unit 201 flows through a SUS pipe 202 provided in the head cover 203, and is in contact with the heater board 204. Board 205
Into the ink flow path formed by laminating
It is supplied from the side of the ink jet recording head. An ejection energy generating element provided on the heater board 204 supplies energy for ejection to the ink in accordance with an electric signal from a PWB 208, which is a printed circuit board that exchanges an electric signal with a printing apparatus (not shown). That is, when the ejection energy generating element is an electrothermal conversion element, the ink generates bubbles by generating heat, and the ink is ejected by the pressure of the bubbles.

Recording is performed by discharging ink onto a recording medium in this manner. However, if continuous recording is performed, the temperature of the ink jet recording head itself rises and adversely affects recording. There is. For this reason, the base plate 106 is provided with a heat dissipation function, and is a material having good thermal conductivity in addition to good mechanical properties, machinability, and forgeability. . Further, the surface of the base plate 106 is provided with corrosion resistance by alumite treatment to prevent corrosion by ink.

[0005] In a recording apparatus having an ink jet recording head, an ink adhering to the discharge surface is formed by sweeping the discharge surface of the ink jet recording head, on which a discharge port for discharging ink is formed, with a blade. The recovery operation is performed to remove the ink, and the ejection characteristics are stabilized.

[0006]

However, in the conventional long ink jet recording head, a spring unit for pushing the top plate and the heater board together is provided in addition to the supply path for supplying ink above the top plate. In this case, the number of parts increases, and the number of manufacturing steps may increase.

[0007] straightness over its longitudinal direction,
In addition, it is sufficient to prevent the occurrence of thermal distortion of components due to temperature rise due to the long size, and also to take sufficient measures against the deformation of the head due to the difference in linear expansion of the material due to the influence of environmental temperature change. There were times when I couldn't say. For example, as a material of a base plate, a metal having a large coefficient of thermal expansion such as aluminum is easily deformed with a change in temperature, and thus warping may occur in a head form.

Therefore, it is considered useful to select a material having a small coefficient of thermal expansion such as isotropic graphite for a base plate member used for a high-density print head such as 600 dpi. Isotropic graphite also has properties such as heat resistance, chemical resistance, and lightness.

However, isotropic graphite has defects, pores, and microcracks inside grain boundaries and structures. For this reason, isotropic graphite has high water absorption and absorbs the attached ink. Therefore, a large amount of ink is sucked in the isotropic graphite blade surface to be wiped. When the amount of the sucked ink reaches a critical state, the ink exudes from the surface of the blade surface and becomes wet. Further, if the amount of ink that is repeatedly wiped and the blade is wiped exceeds the allowable amount, the ink cannot be completely wiped off, and a problem occurs that the recovery operation cannot be performed sufficiently.

[0010] In addition, isotropic graphite has a small bonding force between particles, so that carbon particles are easily generated on the surface and the processed surface. This not only causes dust, but also causes chips and cracks generated during handling such as assembly or installation. Furthermore, in the female screw hole, if the screw is tightened with a strong torque value for the above-described reason, thread cutting occurs. Therefore, it is necessary to increase the margin of the threading strength.

In addition to the above-described problem, bubbles generated in the ink supply path may accumulate in the filter unit, and the recovery efficiency of ink supply or ink pressurization may be reduced.

An object of the present invention is to provide an ink jet recording head and a method of manufacturing the ink jet recording head, which maintain the straightness in the longitudinal direction without increasing the number of parts.

Another object of the present invention is to provide an ink jet recording head and a method for manufacturing the ink jet recording head which do not hinder the recovery operation.

[0014]

An ink jet recording head according to the present invention has a substrate having an element surface on which an energy generating element for generating energy used for discharging ink is provided, and a substrate corresponding to the energy generating element. A top plate that forms the ink passage by joining the groove surface and the element surface, and the substrate from the side opposite to the element surface. An ink supply member having a wall surface of an ink flow path which is in contact with the base plate and which is in contact with the base plate, and which communicates with the ink passage. So that the ink supply member presses the top plate from the side opposite to the groove surface,
The base plate and the ink supply member sandwich the substrate and the top plate with the contact portion as a fulcrum.

According to such an ink jet recording head of the present invention, the member for supplying ink and the member for bringing the top plate and the substrate into close contact with each other are common members as the ink supply member. The number of parts can be reduced by omitting a spring member used only for close contact with the device.

Further, the ink jet recording head of the present invention may be one in which the ink supply member and the base plate are fixed in close contact with each other by screwing at the contact portion.
At the contact portion, the ink supply member and the base plate may be bonded and fixed to each other. In particular, in the case of fixing by bonding, a fixing screw can be omitted.

A printed circuit board for controlling the energy generating element is mounted on the base plate supporting surface of the base plate so as not to interfere with the contact between the ink supply member and the base plate. Is also good. Also, the surface of the base plate on which the printed circuit board is
It may be formed at a position lower than the surface supporting the substrate. With this configuration, especially when wire bonding is used to electrically connect the board and the printed board that is thicker than the board, by making the wire bonding between the printed board and the board almost the same height. Wire bonding can be suitably performed.

Further, the ink jet recording head of the present invention may further include an ink supply second member formed with an ink supply path connected to the ink flow path by being joined to the ink flow path. . The ink supply second member and the base plate may be fixed to each other in close contact by screwing, or may be fixed to each other by being adhered to each other.

Further, a filter may be provided in the ink supply path so that the inflow direction of the ink is substantially vertically upward. Multiple filters are provided,
Among the plurality of filters, the area of the surface of the filter provided in the ink supply path for supplying the ink from the outside to the ink passage is such that the ink supply for returning the ink from the ink passage to the outside is performed. It may be larger than the area of the surface of the filter provided in the road through which ink passes. In this case, air bubbles flowing with the ink can easily pass through each filter using buoyancy,
It is possible to prevent ink flow from being hindered by accumulation of bubbles on the ink inflow side of each filter. In addition, since the area of the surface of the return filter through which the ink passes is reduced in accordance with the reduced ink flowing pressure,
A pressure that can penetrate the filter can also be applied to bubbles on the return side filter. This can reduce the design elements of the recovery system on the recording apparatus side.

The joint between the ink supply members may be sealed with an O-ring or may be sealed with a sealant.

Further, the ink passage may be substantially closed except for a communication port with the ink flow path and a discharge port for discharging ink. In this case, the ink in the ink passage does not come into contact with an external sealant or the like.

The joint between the ink flow path and the communication port is O
It may be sealed with a ring, or may be sealed with a sealant.

A valve having a free end in the direction of the ejection port for ejecting ink and a fixed end in the opposite direction may be provided above the energy generating element integrally with the substrate.

Further, the ink jet recording head of the present invention may be an electrothermal converting element for generating thermal energy as an energy generating element. The ink supply member and the base plate are made of the same material, the substrate and the top plate are made of the same material, and the difference between the linear expansion coefficient between the ink supply member and the base plate and the linear expansion coefficient between the substrate and the top plate is Even if a pitch shift occurs in the arrangement direction of the ejection openings for ejecting ink due to the heat generated by the heat conversion element, the valve may not interfere with the wall surface of the ink passage. In this case, for example, even if a pitch shift occurs between the substrate and the top plate due to the linear expansion of the base plate, the valve and the wall surface of the ink passage do not interfere with each other, so that it is possible to prevent the discharge characteristics from deteriorating. Further, the ink supply member and the base plate are made of the same material, the substrate and the top plate are made of the same material, and the difference between the linear expansion coefficient between the ink supply member and the base plate and the linear expansion coefficient between the substrate and the top plate is Alternatively, the difference may be smaller than the difference between the coefficient of linear expansion of the metal and the coefficient of linear expansion between the substrate and the top plate.

The ink supply member may have thermal conductivity capable of preventing the adverse effects caused by the thermal shock from the electrothermal converting element, and the base plate may prevent the adverse effects caused by the thermal shock from each of the ejection energy generating elements. It may have heat conductivity that can be prevented. In this case, the temperature of the entire ink jet recording head rises in solid recording or the like, and it is possible to prevent the composition deformation or distortion of each member caused by the thermal shock applied to the constituent members.

Further, the ink supply member and the base plate may be made of carbon graphite. In this case, it is possible to contribute to the weight reduction of the ink jet head in addition to the thermal characteristics described above.

In the ink jet recording head of the present invention, the surface of the ink supply member and the surface of the base plate which form the surface provided with the discharge port for discharging ink may have water repellency. In this case, it is possible to prevent a recovery operation failure due to ink seepage into the surface where the ejection openings are formed.

A protective layer for preventing ink impregnation may be formed on substantially the entire outer surfaces of the ink supply member and the base plate.

The ink supply member and the base plate may be impregnated with a liquid agent that penetrates defects, pores, and microscopic cracks. In this case, as the liquid material cures, the bonding force between the particles is strengthened, preventing chipping,
It is possible to provide a function of preventing dust of carbon particles and increasing a margin of thread strength at tap portion.

According to a method of manufacturing an ink jet recording head of the present invention, a substrate having an element surface on which an energy generating element for generating energy used for discharging ink is provided, and an ink corresponding to the energy generating element is provided. A top plate having a groove surface in which a groove serving as a passage is formed, the groove surface and the element surface being joined to form the ink passage, and a base plate supporting the substrate from the side opposite to the element surface And a step of preparing an ink supply member having a wall surface of an ink flow path communicating with the ink passage, and a step of contacting the ink supply member with the base plate. Pressing the substrate from the surface opposite to the element surface with the base plate, and pressing the top plate from the surface opposite to the groove surface with the ink supply member. In Rukoto, characterized in that it and a step of adhering by said ink supply member and the base plate across said top plate and said substrate.

According to such a method of manufacturing an ink jet recording head of the present invention, a member for supplying ink and a member for adhering the top plate and the substrate are prepared as a common member called an ink supply member. Therefore, not only can a step of attaching a spring member used only for close contact between the top plate and the substrate be omitted, but also the cost can be reduced, the apparatus can be simplified, and the processing yield can be improved.

The method of manufacturing an ink jet recording head according to the present invention further includes a step of preparing an ink supply second member having an ink supply path connected to the ink flow path by being joined to the ink supply member. Alternatively, the method may include a protective layer forming step of forming a protective layer for preventing ink impregnation on substantially the entire outer surface of the ink supply member and the base plate. Further, after the protective layer forming step is completed, the method further includes a step of coating the surface of the ink supply member and the surface of the base plate with a water repellent to form a surface provided with an ejection port for ejecting ink. Is also good.

[0033]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an exploded perspective view showing an ink jet recording head according to one embodiment of the present invention, and FIG.
FIG. 2 is a side sectional view taken along line YY ′ in FIG. 1. FIG. 3 is a diagram showing the periphery of the ink passage of the ink jet recording head shown in FIG. 1, and FIG. 4 is a diagram showing a region where the top plate and the base plate are impregnated with the coating agent and a region where the water repellent is impregnated. FIG.

In FIG. 2, the filter box 9 of the second ink supply member 7 is omitted. FIG. 4 (a)
FIG. 4B is a cross-sectional view of the base plate 1 taken along line XX ′ shown in FIG. 1, FIG. 4B is a cross-sectional view of the ink supply member 4 taken along line YY ′, and FIG. FIG. 4D is a cross-sectional view of the ink supply member 4 at a portion where the passage 17 is formed, and FIG. 4D is a cross-sectional view of the ink supply member 4 at a portion corresponding to the base plate 1 shown in FIG. . The arrow g in each drawing indicates the direction of gravity.

The ink jet recording head according to the present embodiment has a base plate 1 made of carbon graphite.
HB2, which is a heater board made of silicon and having a discharge energy generating element such as an electrothermal conversion element 2a and a discharge stability valve (see FIG. 3A) provided above the discharge energy generating element. And Furthermore, H
It has a PWB 8 which is a printed board electrically connected to B2 by wires 16, and a top plate 3 made of silicon and having a plurality of fine grooves formed therein. In addition, the ink supply member 4 made of carbon graphite, in which the ink passage 17 communicating with the communication port 37 of the common liquid chamber 28 of the top plate 3, and the ink supply passage 18 communicating with the ink supply member 4 are provided. And a second ink supply member 7 which is formed and has a filter box 9.

The base plate 1 has an H on which the HB 2 is mounted.
The PWB surface 33 on which the PWB 8 is mounted is formed lower than the B surface 32. As a result, HB2
Thus, the height of the surface on which the wire bonding with the PWB 8 thicker than the HB2 is performed is made uniform, and the wire bonding can be suitably performed. However, the shape of the base plate 1 is H if the PWB 8 is not mounted on the HB surface 32 side of the base plate 1 as in the present embodiment.
It may be flat without providing a step between the B surface 32 side and the PWB surface 33.

The surface of the base plate 1, that is, the entire surface, shown by hatching in FIG.
It is impregnated and coated with a polyimide resin solution. By coating with this polyimide resin solution,
It is possible to prevent ink from penetrating into the base plate 1.

Further, the blade surface 1a (area shaded in FIG. 4A) swept by the blade 20 described later is further coated with a water repellent. The coating of the water repellent on the blade surface 1a, when applied directly to carbon graphite, absorbs the water repellent from the surface and cannot impart sufficient water repellency to the surface. Before the application, the coating with the above-mentioned polyimide solution is performed to make the water-repellent easy to be applied, and then the water-repellent is applied. After applying the water repellent,
By curing at 150 ° C for 3 hours or more, the blade surface 1
a is made water repellent.

Further, as shown in FIG. 4 (b), the hatched area on the surface of the screw hole 34 provided with the female screw of the base plate 1 is impregnated and coated with a PSF (polysulfone) solution. As described later, the second ink supply member 7 is attached to the base plate 1 with screws 5.
In the case of screwing with screws b, screw holes (not shown) corresponding to the screws 5b are also impregnated and coated with the PSF solution. The coating of the PSF solution increases the threading strength and can prevent chipping or cracking of the thread.

The ink supply member 4 has five ceiling plate holding holes 13 through which pins for temporarily holding the top plate 3 pass on the ceiling bonding machine at the time of ceiling bonding, and five holes 13 for HB2 and PWB8. Eight wire bonding sealing holes 12 for sealing the wire bonding locations with the sealing agent 19, and three fixing holes 29 for fixing to a recording device (not shown) are provided on the left and right.
Are formed respectively. The fixing holes 29 are shown in FIG.
One on the left and two on the right are the ones on the left.
This is because the left and right positions can be adjusted with one hole.

The surface of the ink supply member 4 and the ink flow path 1 indicated by hatching in FIG.
7, that is, the entire surface of the ink supply member 4 is impregnated and coated with a polyimide resin solution. By coating with the polyimide resin solution, it is possible to prevent the ink from penetrating into the ink supply member 4.
Further, the blade surface 4a (the area shaded in FIG. 4C) is coated with a water repellent.

The polyimide resin solution used for coating the base plate 1 and the ink supply member 4b may be a polyimide: solvent = 1: 0.8 ratio, and the water repellent may be CTX809A: C
The one using tsolve = 1: 4 (weight ratio) may be used. The PSF solution may be a solution having a weight ratio of 5% (PSF tetrahydrofuran = 5 g: 95 g) using tetrahydrofuran as a solvent. However, when the weight of the dissolved PSF is increased and the concentration of the PSF solution is increased, the graphite-based solution is reduced. It is not appropriate because it does not impregnate the material, that is, carbon graphite, and forms a film on the surface.

The ink supply member 4 and the base plate 1 are in close contact with each other at the fulcrum 30, that is, as shown in FIG. 2, around the screws 5a, and are fixed by eight screws 5a. The screw 5a may be an M2 bind screw.
The ink supply member 4 includes a contact surface serving as a fulcrum 30 and a top plate surface 3 which contacts the upper surface of the top plate 3 and applies a pressing force to the top plate 3.
4, a gap 31 is formed.

The joint between the ink flow path 17 and the communication port 37 may be sealed by an O-ring or a sealant.

Also, for example, the results of a study using a spring material with a conventional long head are fed back. In order to bring the top plate 3 and the HB2 into close contact with a pressing force of 3 kg per screw 5a, a length of about 100 mm is required. When the pitch of each screw 5a is about 14 mm, the dimension C in FIG. 2 is 0.8 mm, the dimension D is 12 mm, and the dimension E is 5.5 m in FIG.
m is preferable. Alternatively, instead of the screw 5a, the ink supply member 4 and the base plate 1 may be bonded and fixed at a fulcrum 30, which is a joint between the ink supply member 4 and the base plate 1. In this case, the screw 5a becomes unnecessary, and the number of parts can be reduced.

The ink supply second member 7 is NORYL.
(: Product name, Engineering Plastics (EPL)
(Mfg. Co., Ltd.), and after being in surface contact with the PWB 8, the base plate 1 and the four M2 binding screws 5b, which are binding screws, are tightly fixed. Alternatively, instead of the screw 5b, the ink supply second member 7 and the base plate 1 may be bonded and fixed. In this case, the screw 5b becomes unnecessary, and the number of parts can be reduced.

The ink supply path 18 formed in the second ink supply member 7 communicates with the ink flow path 17 by fitting the projection hole 35 into the ink flow path 17. The connection with the outside is achieved by bonding with a blocking agent. An O-ring (not shown) is sandwiched between the ink supply member 4 and the ink supply second member 7 so as to seal the periphery of the projection hole 35, and the ink supply member 4 and the ink supply second The member 7 may be fixed.

The other end of the ink supply path 18 with respect to the projection hole 35 communicates with a supply path 23 indicated by a solid line and a return path 24 indicated by a broken line in the filter box 9 shown in FIG. A supply-side filter 21 and a return-side filter 22 are provided in the supply path 23 and the return path 24, respectively. The supply-side filter 21 has a larger area through which ink passes than the return-side filter 22. The ink jet recording head according to the present embodiment is configured on the assumption that the ink is ejected in a vertically downward direction indicated by an arrow g in each drawing when attached to a recording apparatus. Therefore, when ink is supplied from the recording apparatus to the inkjet recording head,
Alternatively, when the ink is returned from the inkjet recording head to the recording apparatus, the direction in which the ink passes through the supply-side filter 21 and the return-side filter 22 is always vertically upward.

That is, when the ink is supplied from the recording apparatus to the ink jet recording head, the bubbles flowing together with the supplied ink have a large passing area through the supply side filter 21 and the flow of the ink is vertically upward. Since the buoyancy of bubbles can be used, the supply-side filter 21 can be easily penetrated. Therefore, there is no possibility that bubbles from outside accumulate on the inflow side of the supply-side filter 21 and hinder the ink supply.

On the other hand, when the ink taken together with the bubbles is circulated in the head and returned to the recording apparatus for use as recycled ink, the bubbles are ejected from the discharge port 25,
The air bubbles that cannot be completely removed pass through the return filter 22 in the course of returning the ink from the inkjet recording head to the recording apparatus. At this time, the ink and the air bubbles pass through the return filter 22 vertically upward, so that the air bubbles can easily pass through the return filter 22. However, as long as the ink comes out from the ejection port 25,
Since the pressure immediately before passing through the return filter 22 is reduced, the diameter of the return filter 22 is smaller than that of the supply filter 21 in accordance with the reduced ink pressure. Thereby, even if the ink pressure when the ink and the air bubbles pass through the return side filter 22 is small, the bubbles can be easily removed.

By controlling the configuration of the double filter of the ink supply second member 7 and the direction of ink circulation as described above, recovery failure due to bubbles can be prevented, and bubbles can be removed even with a small recovery pressure. As a result, the amount of ink used for recovery can be reduced as compared with the related art, and the design elements of the recovery system on the recording apparatus side can be reduced.

The PWB 8 is used to control each of the ejection energy generating elements, and is bonded to the HB 2 with a gold wire 16 to exchange electric signals with the printing apparatus. In the PWB 8 provided on the HB surface 32 side of the base plate 1, a through hole 11 through which the protrusion 10 penetrates is formed at a position corresponding to the protrusion 10 of the base plate 1, so that the ink supply member 4 and the base plate 1 So that it does not interfere with the close contact between them.

The HB2 is formed by depositing a silicon oxide film or a silicon nitride film on a substrate such as silicon for insulation and heat storage, and then forming an electrical resistance element constituting an electrothermal conversion element as a discharge energy generating element. The layers and wirings are patterned. The electric power and the electric signal from the printing apparatus are supplied to the electric resistance layer via the wiring formed on the PWB 8, the wire 16, and the HB 2, and the ejection energy generating element generates heat. As shown in FIG. 3, the valve 14 provided integrally with the HB2 has a free end on the discharge port 25 side and a fixed end on the common liquid chamber 28 side.

The top plate 3 has a plurality of nozzles (ink paths) 26 corresponding to the respective ejection energy generating elements and
A liquid chamber frame 38 having the same height as the height of the nozzle wall 27 when the nozzle wall (ink path wall) 27 of the nozzle 26 is formed.
Are simultaneously formed. Thus, when the top plate 3 is brought into close contact with the HB 2, the common liquid chamber 28 is substantially closed except for the communication port 37 communicating with the ink flow path 17 and the discharge port 25. Therefore, the sealant 19 described below does not come into contact with the ink, and the top plate 3 is only brought into close contact with the HB2 but not with the adhesive. There is no configuration. Here, the nozzle 26 and the common liquid chamber 28 are collectively referred to as an “ink passage”.

Next, an outline of the method of manufacturing the ink jet recording head of this embodiment will be described with reference to the flowchart of FIG.

The order of the respective manufacturing steps described below is such that, after the step of impregnating and coating the polyimide resin solution in the surface treatment of the ink supply member 4 and the base plate 1, the step of coating each blade surface with a water-repellent agent. Except for the implementation, the order may be changed.

First, an ink flow path 17 is formed in the ink supply member 4 made of carbon graphite (step 30).
1) The entire surface of the ink supply member 4 is impregnated with a polyimide resin solution (Step 302), and the blade surface 4a is further coated with a water repellent (Step 3).
03). Similarly, the entire surface of the base plate 1 is also impregnated and coated with a polyimide resin solution (step 304).
The blade surface 1a is coated with a water repellent (step 305). Further, in the base plate 1, the surface of the screw hole 34 is impregnated and coated with a PSF solution (Step 3).
06).

Next, the PWB 8 is adhered to the PWB surface 33 of the base plate 1 with an adhesive tape, and HB2 is adhered to the HB surface 32 (step 307). Then, the wire 16 is bonded to the HB2 and the PWB 8 to be electrically connected (Step 308).

Next, the top plate 3 is placed on the HB 2, the ink supply member 4 is disposed thereon, and a pin is passed through the top plate holding hole 13 of the ink supply member 4 through the top plate holding hole 13 by a ceiling machine. The top plate 3 is temporarily held down (step 309).

Next, the screws 5a are tightened, so that the ink supply member 4 and the base plate 1
Is sandwiched and brought into close contact (step 310).

Next, a sealant 19 is poured into the wire bonding sealing hole 12 of the ink supply member 4 (step 311).

Finally, the ink supply member 4 and the second ink supply member 7 are joined, and the second ink supply member 7 is fixed to the base plate 1 with screws 5b (step 312), thereby producing the ink jet recording head. To end.

As described above, in the ink jet recording head according to the present embodiment, the ink supply member 4 is moved from the top plate surface 34 to the nozzle 26 of the top plate 3 with the contact portion where the ink supply member 4 and the base plate 1 contact each other as the fulcrum 30. The top plate 3 is pressed from the side opposite to the surface constituting
By pressing HB2 from the surface 32 opposite to the surface on which the ejection energy generating element of HB2 is provided, the top plate 3 and HB2 are sandwiched between the ink supply member 4 and the base plate 1 to be in close contact with each other.

Further, in the ink jet recording head of the present embodiment based on the above configuration, when the ejection energy generating element generates heat, heat acts on the ink in the bubble generating region between the valve 14 and the electrothermal conversion element. As a result, bubbles based on the film boiling phenomenon are generated and grow on the electrothermal transducer. The pressure associated with the growth of the bubbles acts on the valve 14 preferentially, and the valve 14
Is displaced so as to greatly open toward the discharge port 25 side.
Then, depending on the displacement or the displaced state of the valve 14,
The propagation of pressure based on the generation of bubbles and the growth of the bubbles themselves are guided to the ejection port 25 side, and ink is ejected from the ejection port 25.

As described above, in the case of the ink jet recording head of the present embodiment which discharges ink with heat generation, the ink supply member 4 and the ink supply second member 7 made of carbon graphite having excellent heat conductivity have a heat radiation function. With this arrangement, the temperature of the entire ink jet recording head rises in solid recording or the like, and it is possible to prevent the composition deformation or distortion of each member caused by the thermal shock applied to the constituent members.

When the ink supply member 4 and the base plate 1 are made of carbon graphite, the linear expansion coefficient is 3.8 × 10 −6 α / K −1 and the HB 2 and the top plate 3 are made of silicon. Has a linear expansion coefficient of 2.6 × 10 −6 α / K −1 , and the difference between these linear expansion coefficients is only 1.2 × 10 −6 α / K −1. It is smaller than the difference between the coefficient of linear expansion of the plate 3 and the coefficient of linear expansion of the metal. Here, the linear expansion coefficient α = (1 / l 0 ) (dl / dt)
Where l 0 is the length at zero degrees and l is the length at t ° C. The difference between the linear expansion coefficients of these two materials, 1.2 × 10 −6 α / K −1, indicates that the length of the ink jet recording head in the present embodiment in the longitudinal direction is, for example, about 10
A long head with a length of 0 mm and an environmental temperature of 55
Even when the temperature is raised to ℃, a difference in elongation of only 3.3 μm on one side is generated in the longitudinal direction, and does not hinder the head structure. That is, when the environmental temperature is Δt with respect to the length of the ink jet recording head in the nozzle row direction, for example, when the temperature changes by a maximum of 55 ° C., it does not affect the ejection function of the ink jet recording head due to pitch shift and the like. HB2 is pulled by the linear expansion of No. 1 and pitch shift b between the top plate 3 and HB2 in the nozzle row direction.
And a valve 1 provided in the nozzle 26 shown in FIG.
4 and the clearance a between the nozzle wall 27 is b <a
Therefore, the valve 14 and the nozzle wall 27 do not interfere with each other. In this case, the clearance a may be 3.7 μm. Note that the above-mentioned Δt may be such that a margin is further provided at 20 ° C. in Δt between the actual use environment temperature of the printing apparatus and the operation assurance temperature range when the head is heated.

Further, since carbon graphite is lightweight, the total weight of the ink jet recording head can be reduced, and this weight reduction allows the ink jet recording head to have a width in a usable surface such as scanning. In the event that the inkjet recording head is dropped, the impact on the entire head can be reduced.

The SUS plate 15 is for suitably attaching the ink jet recording head of this embodiment to a recording apparatus.

FIG. 6 shows a recovery operation by wiping by the blade of the ink jet recording head having the above-described configuration.

Wet ink may adhere to the ejection surface 35 due to ink mist generated when the ink is ejected from the ink jet recording head or satellite ink generated when the ink is refilled. In some cases, the remaining ink may adhere to the ejection surface 35 during the recovery process.

Therefore, as a recovery operation for removing the ink adhering to the discharge port surface, a suction operation for forcibly discharging ink from the discharge port 25 and the discharge surface 35 by the blade 20 made of an elastic material or the like are performed. Wiping for wiping and cleaning is performed.

Wiping is performed by rubbing the blade 20 while directly moving the blade 20 in direct contact with the blade surface 4a, the discharge surface 35, and the blade surface 1a forming the discharge port surface 36. The periphery is cleaned to ensure discharge stability. Since the blade surface 4a and the blade surface 1b are coated with the water repellent, the ink does not soak into the blade surface 4a and the blade surface 1b during wiping. Therefore,
It is possible to prevent the recovery operation from becoming insufficient due to ink seepage into the blade surface 4a and the blade surface 1b.

The HB surface 32 and the top plate surface 3 shown in FIG.
The thickness of the top plate 3 and the HB2 bonded together may be made 0.1 mm thicker than the distance F of the gap between the top plate 3 and the HB2. In this case, the base plate 1 is bent by 0.1 mm to the side opposite to the ink supply member 4, and this state is a state in which the top plate 3 and the HB 2 can be securely brought into close contact.

As described above, according to the ink jet recording head of this embodiment, the HB 2 and the top plate 3 are sandwiched between the ink supply member 4 made of carbon graphite and formed with the ink flow path and the base plate 1. This eliminates the need for a spring unit and the like, which not only reduces the number of components but also allows both the ink supply member 4 and the base plate 1 to have a heat dissipation function, thereby protecting the ink jet recording head from thermal shock. be able to.

The blade surface 4a of the ink supply member 4
In addition, since the blade surface 1b of the base plate 1 is coated with the water repellent, it is possible to prevent the recovery operation from becoming insufficient due to ink seepage into the blade surface 4a and the blade surface 1b. In addition, screw 5
By coating the screw holes into which the screws a and 5b are screwed with the PSF solution, it is possible to prevent chipping or cracking of the screw threads formed in the screw holes.

Further, the return-side filter 22 and the supply-side filter 21 in the filter box 9 include the return-side filter 22 and the supply-side filter 21 having a larger area through which ink passes than the return-side filter 22. It is provided so that the direction of the movement is always vertically upward. For this reason, the bubbles flowing together with the ink can easily pass through each filter, and it is possible to prevent the flow of the ink from being hindered by the accumulation of bubbles on the ink inflow side of each filter.

Further, the configuration of the common liquid chamber of the conventional long head is such that a liquid resist is adhered to shut off from the outside, and a so-called grooved top plate method seals an area without ribs. I was In such a case, the bonding process is required, and the sealing agent comes into contact with the ink, and the substance that has melted and reacted with the ink in a long-term use environment becomes clogged in the discharge port. Although there was a risk of causing a market trouble, the ink jet recording head of the present embodiment uses a liquid as a method of shutting off the common liquid chamber 28 from the outside when forming a groove for discharging ink by a photolithography process. The pattern of the chamber frame 38 is also formed at the same height as the groove,
When the head was assembled, it was cut off from the outside without bonding. Further, the periphery of the common liquid chamber 28 is sealed as a holding means, but this is performed simultaneously with the sealing of the wire bonding portion, so that there is no additional process. Also, the used sealant does not flow into the common liquid chamber 28, and the above-described market trouble can be avoided.

[0079]

As described above, according to the ink jet recording head of the present invention, the top plate and the substrate are brought into close contact with each other by being sandwiched between the ink supply member in which the ink flow path is formed and the base plate. A spring member used only for the close contact between the top plate and the substrate can be omitted.
In addition, since the ink supply member and the base plate are formed of carbon graphite having a small difference in linear expansion coefficient between the top plate and the substrate, the ink supply member and the base plate are not only lightweight, but also have high heat radiation characteristics,
Because the straightness over the longitudinal direction is ensured, and the surface on which the discharge port is formed has water repellency,
It is possible to prevent a recovery operation failure due to ink penetration.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an inkjet recording head according to an embodiment of the present invention.

FIG. 2 is a side sectional view showing the inkjet recording head shown in FIG.

FIGS. 3A and 3B are views showing the periphery of an ink passage of the ink jet recording head shown in FIG. 1, wherein FIG. 3A is a side sectional view, and FIG.

FIG. 4 is a diagram showing a region impregnated with a coating agent and a region impregnated with a water-repellent agent on the top plate and the base plate.

FIG. 5 is a schematic diagram showing each filter provided in the filter box.

FIG. 6 is a diagram illustrating a recovery operation by sweeping a blade.

FIG. 7 is a flowchart illustrating an outline of a method for manufacturing an ink jet recording head according to an embodiment of the present invention.

FIG. 8 is a perspective view showing an example of a conventional long ink jet recording head.

FIG. 9 is a side sectional view showing a top plate used in a conventional ink jet recording head.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base plate 1a, 4a Blade surface 2 HB 3 Top plate 4 Ink supply member 5 Screw 7 Ink supply second member 8 PWB 9 Filter box 10 Convex part 11 Through hole 12 Wire bonding sealing hole 13 Hole 14 Valve 15 SUS plate 16 Wire bonding 17 Ink flow path 18 Ink supply path 19 Sealant 20 Blade 21 Supply side filter 22 Return side filter 23 Supply path 24 Return path 25 Discharge port 26 Nozzle 27 Nozzle wall 28 Common liquid chamber 29 Fixing hole 30 Support point 31 Void portion 32 HB surface 33 PWB surface 34 Screw hole 35 Discharge surface 36 Discharge port surface 37 Communication port 38 Liquid chamber frame

Continuing on the front page (72) Yoshikazu Omata 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Hirotaka Miyazaki 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Ryo Shimamura 3-30-2 Shimomaruko, Ota-ku, Tokyo F-term within Canon Inc. (reference) 2C056 EA15 EA21 EA24 EA25 EC15 FA03 HA05 HA15 HA16 HA17 KB16 KB26 2C057 AF65 AF76 AF99 AG12 AG46 AG71 AG76 AG77 AG85 AK07 AP25 AP58 AP60 AP71 BA13

Claims (30)

[Claims]
1. A substrate having an element surface on which an energy generating element for generating energy used for discharging ink is provided, and a groove formed with an ink passage corresponding to the energy generating element. A top plate that has a surface, the groove surface and the element surface are joined to form the ink passage, a base plate that supports the substrate from a side opposite to the element surface, and a contact portion that is in contact with the base plate. An ink supply member that abuts and has a wall surface of an ink passage that communicates with the ink passage;
The base plate and the ink supply member such that the base plate presses the substrate from the side opposite to the element surface, and the ink supply member presses the top plate from the side opposite to the groove surface. Wherein the substrate and the top plate are sandwiched with the contact portion as a fulcrum.
2. The ink jet recording head according to claim 1, wherein the ink supply member and the base plate are tightly fixed at the contact portion by screwing.
3. The ink jet recording head according to claim 1, wherein the ink supply member and the base plate are adhered and fixed to each other at the contact portion.
4. A printed circuit board for controlling the energy generating element is mounted on a surface of the base plate supporting the substrate so as not to interfere with the contact between the ink supply member and the base plate. Claim 1
3. The ink jet recording head according to item 1.
5. The ink jet recording head according to claim 4, wherein a surface of the base plate on which the printed circuit board is mounted is formed at a position lower than a surface supporting the substrate.
6. The ink supply second member according to claim 1, further comprising an ink supply second member joined to the ink supply member to form an ink supply passage communicating with the ink flow path. Inkjet recording head.
7. The ink jet recording head according to claim 6, wherein the second ink supply member and the base plate are fixed to each other by screwing.
8. The ink jet recording head according to claim 6, wherein the second ink supply member and the base plate are adhered and fixed to each other.
9. The ink jet recording head according to claim 6, wherein a filter is provided in the ink supply path such that an inflow direction of the ink is substantially vertically upward.
10. The filter according to claim 1, wherein a plurality of filters are provided, and among the filters, an area of a surface of a filter provided in the ink supply path for supplying ink from the outside to the ink path, through which ink passes. 10. The ink jet recording head according to claim 9, wherein an area of a surface of a filter provided in the ink supply path for returning the ink from the ink path to the outside, passes through.
11. The connecting portion between the ink supply members is O
The ink jet recording head according to claim 6, which is sealed with a ring.
12. The ink jet recording head according to claim 6, wherein a joint between the ink supply members is sealed with a sealant.
13. The ink jet recording head according to claim 1, wherein the ink path is substantially sealed except for a communication port with the ink flow path and a discharge port for discharging ink.
14. The ink jet recording head according to claim 13, wherein a joint between the ink flow path and the communication port is sealed with an O-ring.
15. The ink jet recording head according to claim 13, wherein a joint between the ink flow path and the communication port is sealed with a sealant.
16. A valve having a free end in a direction of a discharge port for discharging ink and a fixed end in a direction opposite to the direction is provided integrally with the substrate above the energy generating element. The inkjet recording head according to claim 1.
17. The ink jet recording head according to claim 1, wherein the energy generating element is an electrothermal converting element that generates heat energy.
18. The ink supply member and the base plate are made of the same material, the substrate and the top plate are made of the same material, and the coefficient of linear expansion between the ink supply member and the base plate is determined. The difference between the linear expansion coefficient and the top plate does not cause interference between the valve and the wall surface of the ink passage even if a pitch shift occurs in the arrangement direction of the ejection openings for ejecting ink due to the heat generated by the electrothermal transducer. The inkjet recording head according to claim 17, wherein
19. The ink supply member and the base plate are made of the same material, the substrate and the top plate are made of the same material, and a coefficient of linear expansion between the ink supply member and the base plate is determined. The inkjet recording head according to claim 1, wherein a difference between a linear expansion coefficient of the top plate and a linear expansion coefficient of the metal is smaller than a difference between a linear expansion coefficient of the metal and a linear expansion coefficient of the substrate and the top plate.
20. The ink jet recording head according to claim 17, wherein the ink supply member has a thermal conductivity capable of preventing an adverse effect due to a thermal shock from the electrothermal transducer.
21. The ink jet recording head according to claim 17, wherein the base plate has a thermal conductivity capable of preventing an adverse effect due to a thermal shock from the electrothermal transducer.
22. The ink jet recording head according to claim 1, wherein said ink supply member and said base plate are made of carbon graphite.
23. The ink jet recording head according to claim 22, wherein the surface of the ink supply member and the surface of the base plate, which form a surface provided with a discharge port for discharging ink, have water repellency.
24. The ink jet recording head according to claim 22, wherein a protective layer for preventing ink impregnation is formed on substantially all outer surfaces of the ink supply member and the base plate.
25. The ink jet recording head according to claim 22, wherein a liquid agent penetrating defects, pores and microscopic cracks existing in the ink supply member and the base plate is impregnated.
26. A substrate having an element surface provided with an energy generating element for generating energy used for discharging ink, and a groove formed with a groove serving as an ink passage corresponding to the energy generating element. Manufacture of an ink jet recording head having a top plate having a surface, wherein the groove surface and the element surface are joined to form the ink passage, and a base plate for supporting the substrate from a side opposite to the element surface. A method of preparing an ink supply member having a wall surface of an ink flow path communicating with the ink passage; a step of contacting the ink supply member with the base plate; and an opposite of the element surface at the base plate. The base plate and the ink are pressed by pressing the substrate from the surface side and pressing the top plate from the side opposite to the groove surface with the ink supply member. A step of holding the substrate and the top plate in close contact with a supply member and bringing the substrate into close contact therewith.
27. The method for manufacturing an ink jet recording head according to claim 26, further comprising a step of preparing an ink supply second member having an ink supply path connected to the ink flow path by being joined to the ink supply member. .
28. The method of manufacturing an ink jet recording head according to claim 26, further comprising a protection layer forming step of forming a protection layer for preventing ink impregnation on substantially all outer surfaces of the ink supply member and the base plate.
29. A step of coating the surface of the ink supply member and the surface of the base plate with a water repellent, which forms a surface provided with an ejection port for ejecting ink after completion of the protection layer forming step. The method for manufacturing an ink jet recording head according to claim 28, further comprising:
30. The method for manufacturing an ink jet recording head according to claim 26, further comprising a step of impregnating a liquid agent penetrating defects, pores, and microscopic cracks existing in the ink supply member and the base plate.
JP2001181597A 2000-06-15 2001-06-15 Ink-jet recording head and its manufacturing method Pending JP2002067330A (en)

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Cited By (10)

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JP2005270743A (en) * 2004-03-23 2005-10-06 Toshiba Corp Ink jet head
JP2006007718A (en) * 2004-06-29 2006-01-12 Kyocera Corp Ink-jet recording head and ink-jet printer
JP2006056242A (en) * 2004-07-20 2006-03-02 Brother Ind Ltd Inkjet head
WO2008096618A1 (en) * 2007-02-09 2008-08-14 Konica Minolta Medical & Graphic, Inc. Inkjet head, inkjet printer, and inkjet recording method
US7422309B2 (en) 2003-09-24 2008-09-09 Fujifilm Corporation Droplet discharging head
WO2008126469A1 (en) * 2007-03-27 2008-10-23 Konica Minolta Medical & Graphic, Inc. Ink-jet printer and ink-jet recording method
JP2011143342A (en) * 2010-01-14 2011-07-28 Konica Minolta Ij Technologies Inc Inkjet head, method for manufacturing inkjet head and inkjet recording method
JP2011240543A (en) * 2010-05-17 2011-12-01 Canon Inc Inkjet head unit
JP2011240520A (en) * 2010-05-14 2011-12-01 Canon Inc Liquid discharge head, liquid discharge apparatus, and liquid filling method
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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7422309B2 (en) 2003-09-24 2008-09-09 Fujifilm Corporation Droplet discharging head
JP2005270743A (en) * 2004-03-23 2005-10-06 Toshiba Corp Ink jet head
JP2006007718A (en) * 2004-06-29 2006-01-12 Kyocera Corp Ink-jet recording head and ink-jet printer
JP4583089B2 (en) * 2004-06-29 2010-11-17 京セラ株式会社 Ink jet recording head and ink jet printer
JP2006056242A (en) * 2004-07-20 2006-03-02 Brother Ind Ltd Inkjet head
WO2008096618A1 (en) * 2007-02-09 2008-08-14 Konica Minolta Medical & Graphic, Inc. Inkjet head, inkjet printer, and inkjet recording method
JPWO2008096618A1 (en) * 2007-02-09 2010-05-20 コニカミノルタエムジー株式会社 Ink jet head, ink jet printer, ink jet recording method
US8764170B2 (en) 2007-02-09 2014-07-01 Konica Minolta Medical & Graphic, Inc. Ink-jet head, ink-jet printer, and ink-jet recording method
WO2008126469A1 (en) * 2007-03-27 2008-10-23 Konica Minolta Medical & Graphic, Inc. Ink-jet printer and ink-jet recording method
JP2011143342A (en) * 2010-01-14 2011-07-28 Konica Minolta Ij Technologies Inc Inkjet head, method for manufacturing inkjet head and inkjet recording method
JP2011240520A (en) * 2010-05-14 2011-12-01 Canon Inc Liquid discharge head, liquid discharge apparatus, and liquid filling method
JP2011240543A (en) * 2010-05-17 2011-12-01 Canon Inc Inkjet head unit
JP2014097667A (en) * 2014-02-24 2014-05-29 Konica Minolta Inc Inkjet head, method for manufacturing inkjet head and inkjet recording method

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