JP2008093989A - Inkjet recording head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use a resin material for a base member of an ink jet recording head, when the adhesive becomes thick (exceeds several tens of microns), the heat transfer efficiency to the base member via the adhesive deteriorates, and the recording element substrate The temperature will rise excessively. As a result, the desired thermal energy is shifted from the heat conversion element to be applied to the ink droplets, and problems such as abnormal ejection are likely to occur.
In an ink supply system to a chip capable of bidirectional printing in a chip plateless head, an ink path is distributed by a communication groove provided on a chip joint surface of a base member. Dispo head compatible with bidirectional printing.
[Selection] Figure 1

Description

  The present invention relates to an ink jet recording head used in an ink jet recording apparatus that performs a recording operation by discharging a liquid such as ink. The present invention can be applied to a general printing apparatus, a copying machine, a facsimile having a communication system, an apparatus such as a word processor having a printing unit, or a multifunction recording apparatus combining these apparatuses.

  The ink jet recording apparatus is a so-called non-impact recording apparatus, capable of high-speed recording, recording on various recording media, and almost no noise during recording. It has characteristics such as. For this reason, the ink jet recording apparatus is widely adopted as an apparatus that bears a recording mechanism such as a printer, a copying machine, a facsimile, a word processor, and the like.

  Typical ink ejection methods for recording heads mounted on inkjet recording devices include those using electromechanical transducers such as piezo elements, and heat generated by irradiation with electromagnetic waves such as lasers. In addition to those that discharge droplets, there are known devices that heat ink by an electrothermal conversion element having a heating resistor and discharge ink droplets by the action of film boiling. An ink jet recording head using an electrothermal conversion element is provided with an electrothermal conversion element in a recording liquid chamber, and an electric pulse serving as a recording signal is supplied thereto to generate heat, thereby giving thermal energy to the ink. In general, ink is recorded on a recording medium by ejecting minute ink droplets from minute ejection ports using the bubble pressure when ink is foamed (at the time of boiling). An ink jet recording nozzle for discharging droplets and a supply system for supplying ink to the nozzle are provided.

  A recording apparatus including the above-described ink jet recording head can output high-quality characters and images at low cost. In particular, the bubble jet (registered trademark) method proposed by Canon Inc., the applicant of the present application, causes droplets to be ejected as a result of film boiling in liquid (formation, growth, defoaming, disappearance). Printers based on the discharge principle (hereinafter referred to as the BJ method) occupy most of the market because of the advantage that color printing can be performed at a low price. This printer uses a bubble jet (registered trademark) system in common for each head unit that discharges black ink as a black liquid and color liquids of cyan, magenta, and yellow.

  In general, the number of ejection ports of each head unit has been increased from 64 to 128, further to 256, etc. due to the trend toward higher image quality, and “dpi” in terms of the number of ejection ports per inch. Therefore, the arrangement is high density such as 300 dpi and 600 dpi. A heating element as an electrothermal converter disposed with respect to these discharge ports forms bubbles due to film boiling by pulse-like driving on the order of several μsec to 10 μsec, but at high speed by high-frequency driving, Realizes high-quality prints.

  On the other hand, as a new method proposed by the applicant of the present application, which is an improvement on the above-described bubble jet (registered trademark) method, by allowing bubbles to communicate with the atmosphere, droplets are made constant and fine droplets can be ejected. Printers using an air communication method, a so-called bubble through jet method (hereinafter referred to as a BTJ method) have been put on the market. This printer also has the same black, cyan, magenta, and yellow color head portions as the above-mentioned printer, and the BTJ method is commonly used for each head portion, so that the stable discharge amount of micro droplets can be reduced. Ensure high-quality prints. That is, in order to achieve high-quality color recording equivalent to silver halide photography, it is necessary to make the dots as small as the dots are not visible on the paper (no graininess). The droplet is set to have a size of about 5 pl (picoliter, 10-12 liter), a dot diameter of 40 to 50 μm, and a resolution of 600 × 1200 to 1200 × 1200 dpi (dpi is a unit indicating the number of dots per inch). However, a BTJ printer can sufficiently cope with such a setting.

  The configuration and manufacturing method of these recording heads are disclosed in Japanese Patent Application Laid-Open No. 2002-19119.

  The main components of the ink jet recording head disclosed in these publications include an ejection port from which ink droplets are ejected, and an ejection energy generation unit that generates ejection energy for ejecting ink droplets from the ejection ports. And a ceramic base member typified by alumina or the like to which the recording element substrate is fixed. In addition, an ink tank part is detachable as an ink storage part.

  On the other hand, an ink jet recording head disclosed in Japanese Patent Application Laid-Open No. 2002-86731 has been invented in order to achieve the recent demand for an ink jet recording apparatus such as higher image quality and higher speed.

  In this publication, the recording element substrate has a plurality of ejection port arrays corresponding to a plurality of ink types, and the ejection port arrays for the same type of ink are arranged so as to be symmetric with respect to the scanning direction of the head. . With this configuration, “reciprocal printing”, which is one means for increasing the speed of the ink jet recording apparatus, has been achieved under the balance of high image quality.

(For example, by arranging the ejection port arrays in cyan, magenta, yellow, magenta, and cyan, it is possible to make the ink deposition order on the recording medium the same in the forward / return paths. This avoids color unevenness defects caused by the difference in the order of ink adhesion, and by substantially shifting the i-th ejection ports of a plurality of ejection port arrays for the same type of ink by a half pitch in the column direction. (High-definition printing twice as much is possible.)
JP 2002-19119 A JP 2002-86731 A

  As described above, an ink jet recording apparatus has been widely adopted as an apparatus that bears a recording mechanism such as a printer, a copying machine, a facsimile, a word processor, and the like. Therefore, a manufacturer of an ink jet recording apparatus represented by the present inventor has a mission to market a cheaper ink jet recording apparatus than ever before with the aim of further spreading. In order to achieve this mission, the manufacture of an ink jet recording apparatus typified by the present inventor can further reduce the manufacturing cost of the ink jet recording head as one method.

  As a method for reducing the manufacturing cost of an ink jet recording head, there are a reduction in material cost of parts constituting the head, a reduction in the number of parts by integration of parts, and a reduction in manufacturing processes associated therewith.

  Under such circumstances, an inexpensive general resin material is used for the base member in place of the ceramic material (such as alumina) which is a constituent material of the base member described in the above-mentioned JP-A-2002-19119. Techniques have been devised.

  Here, the effect of using the resin material does not merely reduce the material cost of the base member. In general, a resin material can be molded into a part using a mold represented by injection molding. Therefore, a complicated part shape can be formed in one process by using the molding method. Accordingly, it is possible to integrate the base member and the ink supply member described in JP-A-2002-19119 into one component.

(Here, the “base member” is a member that supports and fixes the recording element substrate in Japanese Patent Laid-Open No. 2002-19119, and the “ink supply member” is the base member and the ink tank portion in the same publication. It is a member that forms the ink path between
On the other hand, in a recording head as described in the above-mentioned Japanese Patent Application Laid-Open No. 2002-86731 aiming at higher image quality / higher speed, the ejection port arrays for the same type of ink are symmetrical with respect to the scanning direction of the head. In other words, the related ink of the same color must be distributed / supplied to the plurality of ejection port arrays of the recording element substrate. In this publication, in addition to the base member and the ink supply member, a “flow path forming member” is arranged to distribute / supply ink related to a plurality of ejection port arrays.

  However, the existence of separate parts such as the above-mentioned flow path forming member is a conflicting phenomenon with respect to the manufacturing cost reduction (part integration, process reduction) of the recording head, and the manufacturer of the ink jet recording apparatus represented by the present inventor It has become an issue.

  On the other hand, when a general resin material is used as a constituent material of the base member and injection molding is adopted as the molding method, the surface roughness of the molding surface is generally limited to about several tens of microns in principle. Therefore, the adhesive that fixes the base member and the recording element substrate absorbs the surface roughness of the molding surface, and the thickness of the adhesive is required to be several tens of microns or more in order to fill the adhesive without excess or deficiency (conventional) Until then, the surface roughness of the base member was reduced to several microns or less by performing additional processing on the recording element substrate bonding surface by planar polishing or the like, and the thickness of the adhesive was about several microns).

  Here, in the ink jet recording head that discharges ink droplets by the above-described electrothermal conversion element, the temperature rise (heat storage) of the recording element substrate is generated due to the surplus thermal energy used for the ink discharge. At this time, in the conventional recording head as shown in Japanese Patent Application Laid-Open No. 2002-19119, the heat storage amount of the recording element substrate is caused by heat radiation from the recording element substrate itself and heat transfer to the base member via the adhesive. An excessive temperature rise of the recording element substrate could be avoided.

  However, as described above, when a resin material is used for the base member, if the adhesive becomes thick (exceeds several tens of microns), the heat transfer efficiency to the base member via the adhesive deteriorates, and the temperature of the recording element substrate Will rise excessively. As a result, the desired thermal energy is shifted from the heat conversion element to be applied to the ink droplets, and problems such as abnormal ejection are likely to occur.

  These increase in the number of ejection ports as the image quality / speedup of the ink jet recording head increases (arranged so that the ejection port arrays for the same type of ink are symmetric with respect to the scanning direction of the head on the recording element substrate described above. Recording heads, heads with further extended ejection orifice arrays, and heads with more ink color types).

  A recording element substrate having an ejection port through which ink droplets are ejected and a plurality of ink supply ports penetrating the front and back of the substrate for supplying ink to the ejection port, a bonding surface of the recording element substrate, and the recording A base member having a plurality of ink outlets for supplying ink from the ink storage portion to the ink supply port of the element substrate, the recording element substrate and the base member are fixed, and the ink supply port of the recording element substrate and the base And an adhesive filled so as to seal the ink path between the ink outlets of the member, and the recording element substrate bonding surface of the base member has a plurality of grooves, All communicate with the ink outlet, and at least one of the grooves communicates with a plurality of ink supply ports of the recording element substrate, and the recording element substrate and the base By fixing the wood, groove portion is an ink jet recording head is characterized in that as ink paths forming a first side surface at the back surface of the recording element substrate.

  Further, the groove portion is an ink jet recording head characterized in that it is formed integrally with the base member.

  Further, in the ink jet recording head, all the ink outlets and all the groove portions of the base member are disposed in a joining region of the recording element substrate of the base member.

  Furthermore, the ink outlet of the base member is arranged at the approximate center of the communicating groove portion.

  Further, in the ink jet recording head, the groove portion of the base member has a substantially symmetric (same) shape around the communicating ink outlet.

  Further, in the inkjet recording head, the plurality of ink supply ports of the recording element substrate have substantially the same shape and are aligned in substantially the same straight line.

  Further, in the ink jet recording head, the plurality of ink outlets of the base member supply different types of ink.

  Furthermore, the base member is an ink jet recording head in which an ink storage portion is integrated.

  According to the present invention, the ejection port arrays for the same type of ink are arranged symmetrically with respect to the scanning direction of the head on the recording element substrate for the purpose of higher image quality and higher speed of the inkjet recording head. Achieves the above objectives with a simple configuration without increasing the number of parts of a print head (that is, a print head having a configuration in which the related ink of the same color must be distributed / supplied to a plurality of ejection port arrays of the print element substrate). It becomes possible to do.

  Further, even when the adhesive (which fixes the base member and the recording element substrate) becomes thicker than before by using a resin material for the base member, an excessive increase in the recording element substrate temperature can be suppressed, abnormal ejection, etc. Can be avoided.

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

  2 to 4 are explanatory views for explaining a suitable recording head to which the present invention is implemented or applied. Hereinafter, each component will be described with reference to these drawings.

  A recording head H1001 of this embodiment is shown in FIGS. The recording head H1001 is fixedly supported on a carriage mounted on the ink jet recording apparatus main body by positioning means and electrical contacts, and is detachable from the carriage. When the filled ink is not consumed, the recording head can be replaced.

  Hereinafter, each component constituting the recording head H1001 will be described in detail.

(Recording head H1001)
The recording head H1001 is for discharging ink of three colors, cyan, magenta, and yellow. As shown in the exploded perspective view of FIG. 3, the recording element substrate H1101, the electric wiring substrate H1301, the ink supply holding member H1501, and the filter H1701, H1702, H1703, ink absorbers H1601, H1602, H1603, a cover member H1901, and a seal member H1801.

(Recording element substrate H1101)
FIG. 4 is a partially broken perspective view for explaining the configuration of the recording element substrate H1101. On the Si substrate H1110 of the recording element substrate H1101, an ink flow path wall H1106 and an ejection port H1107 made of a resin material are formed by electric wiring, a fuse or resistor, an electrode portion, and a photolithography technique. The Si substrate H1110 has an ink supply port H1102 penetrating the front and back of the Si substrate for supplying ink to the ejection port H1107. Further, bumps H1105 such as Au are formed on the electrode terminal H1104 for supplying electric power to the electric wiring on the Si substrate H1110.

(Electrical wiring board H1301)
The electrical wiring substrate H1301 (FIG. 3) is obtained by forming a copper foil wiring pattern on a polyimide base material, and an electrical signal path for applying an electrical signal for ejecting ink to the recording element substrate H1101. Form. An opening for incorporating the recording element substrate H1101 is formed in the electrical wiring substrate H1301, and a lead terminal H1304 connected to the electrode terminal H1104 of the recording element substrate H1101 is formed near the edge of the opening. ing. In addition, an external signal input terminal H1302 for receiving an electrical signal from the main unit is formed on the electrical wiring board H1301, and the lead terminal H1304 and the external signal input terminal H1302 are connected by a continuous copper foil wiring pattern. Yes.

  The electrical connection between the electrical wiring substrate H1301 and the recording element substrate H1101 is, for example, a bump H1105 formed on the electrode terminal H1104 of the recording element substrate H1101 and a lead of the electrical wiring substrate H1301 corresponding to the electrode terminal H1104 of the recording element substrate H1101. The terminal H1304 is electrically connected by a TAB mounting technique.

(Ink supply holding member H1501)
The ink supply holding member H1501 is formed by resin molding, for example. As the resin material, it is desirable to use a resin material mixed with 5 to 40% of glass filler in order to improve the shape rigidity. As shown in FIG. 3, the ink supply holding member H1501 has an ink tank function and an ink supply function. An ink tank function is realized by having spaces for independently holding ink absorbers H1601, H1602, and H1603 for generating negative pressure for holding cyan, magenta, and yellow ink inside. Yes. Further, an ink supply function is realized by forming an independent ink flow path for guiding ink to each ink supply port H1102 of the recording element substrate H1101.

  As the ink absorbers H1601, H1602, and H1603, compressed PP fibers are used, but instead, compressed urethane fibers may be used. Filters H1701, H1702 for preventing dust from entering the inside of the recording element substrate H1101 at the boundary between the ink absorbers H1601, H1602, H1603 and the respective ink channels located at the upstream portion of each ink channel. H1703 are joined by welding. Each filter H1701, H1702, and H1703 may be a SUS metal mesh type, but a SUS metal fiber sintered type is more preferable.

  An ink outlet H1201 for supplying cyan, magenta, and yellow ink to the recording element substrate H1101 is formed in the downstream portion of the ink flow path, and each ink supply port 1102 of the recording element substrate H1101 supplies ink. The recording element substrate H1101 is bonded and fixed to the ink supply holding member H1501 with high positional accuracy so as to communicate with each ink outlet H1201 of the holding member H1501. The first adhesive used for the adhesion is desirably a low viscosity, low curing temperature, cured in a short time, and ink-resistant. As such a 1st adhesive agent, there exists a thermosetting adhesive agent which has an epoxy resin as a main component, for example. When this thermosetting adhesive is used, the thickness of the adhesive layer is desirably about 50 μm.

  Further, a part of the back surface of the electric wiring board H1301 is bonded and fixed to the surrounding flat surface near the ink outlet H1201 by the second adhesive. The electrical connection portion between the recording element substrate H1101 and the electrical wiring substrate H1301 is sealed with a first sealant H1307 and a second sealant H1308 (FIG. 2), whereby the electrical connection portion is made of ink. Protects against corrosion and external impacts. The first sealing agent H1307 mainly seals the back surface side of the connection portion between the lead terminal H1302 of the electric wiring board H1300 and the bump H1105 of the recording element substrate and the outer peripheral portion of the recording element substrate, and the second sealing. The agent H1308 seals the front side of the connecting portion. The unbonded portion of the electric wiring board H1301 is bent and fixed to the side surface of the ink supply holding member H1501 that is substantially orthogonal to the surface having the ink outlet H1201 by heat caulking or bonding.

(Cover member H1901)
The lid member H1901 is welded to the upper opening of the ink supply holding member H1501, thereby closing the independent spaces inside the ink supply holding member H1501. However, the lid member H1901 has narrow openings H1911, H1912, and H1913 for releasing pressure fluctuations in the respective chambers inside the ink supply holding member H1501, and fine grooves H1921, H1922, and H1923 communicating with these. The other ends of the fine grooves H1921 and H1922 join in the middle of the fine groove H1923. Further, most of the fine grooves H1923 and the narrow openings H1911, H1912, H1913 and all of the fine grooves H1921, H1922 are covered with a seal member H1801, and the other end of the fine groove H1923 is opened to form an air communication port H1925. ing. The lid member H1901 has an engagement portion H1930 for fixing the recording head to the ink jet recording apparatus.

  FIG. 5 is a schematic perspective view showing the relationship between the recording element substrate H1101 in the present embodiment, and FIG. 1 shows the relationship between the recording element substrate H1101 and the joining portion of the recording element substrate H1101 of the ink supply holding member (hereinafter referred to as base member) H1501.

  As shown in FIG. 5, ejection port arrays H1121a, 1121b, 1122a, 1122b, 1123a, 1123b are arranged on the recording element substrate H1101 of the present invention. Further, in order to supply ink to the ejection port array, ink supply ports H1131, 1132a, 1132b, 1133a, and 1133b (shown by broken lines) penetrating the front and back of the recording element substrate H1101 are arranged. Here, the relationship between the ejection port array and the ink supply port is that the ink supply port H1131 communicates with the ejection port arrays H1121a and 1121b, the ink supply port H1132a is the ejection port H1122a, and the ink supply port H1132b is the ejection port H1122b. The ink supply port H1133a communicates with the ejection port H1123a, and the ink supply port H1133b communicates with the ejection port H1123b.

  Further, the ejection ports belonging to each ejection port array are arranged at a pitch m, and with respect to the ejection ports belonging to the ejection port array on the left side (on the paper surface) across the ink supply port H1131 located at the center. The positions of the discharge ports belonging to the right discharge port array are shifted by a distance n = m / 2. Thereby, high-definition printing that is substantially twice the arrangement pitch of the discharge ports is possible.

  FIG. 1 is a schematic perspective view illustrating the relationship between the recording element substrate H1101 and the joint portion of the recording element substrate H1101 of the base member H1501.

  Ink joint outlets H1151, H1152, and 1153 are arranged at the recording element substrate joint portion of the base member H1501 in order to supply ink stored in the upstream ink storage portion to the recording element substrate H1101, which are different from each other. Different types of ink can be supplied.

  Further, in this embodiment, the groove portions H1141, H1142, and H1143 communicating with each of the ink outlets are disposed at the recording element substrate joint portion of the base member H1501. The groove portion is separated and sealed by an adhesive or the like that fixes the recording element substrate H1101 and the base member H1501, and the ink between the ink outlet of the base member and the ink supply port of the recording element substrate is sealed. Form a pathway.

  Hereinafter, the operation of the groove will be described in detail.

  FIG. 6 is a schematic plan view showing the relationship between the recording element substrate H1101 and the recording element substrate H1101 joint of the base member H1501.

  Grooves H1141, H1142, and 1143 are provided at the recording element substrate bonding portion of the base member H1501, the groove H1141 communicates with the ink outlet H1151, the groove H1142 becomes the ink outlet H1152, and the groove H1143 becomes the ink outlet H1153. Each communicates. The groove part can be molded together with the other part (ink storage part, electrical wiring board joint part, etc.) of the base member (ink supply holding member) by a mold forming technique using a resin material or the like.

  The hatching shown in FIG. 6 indicates a region where an adhesive H2001 for fixing the recording element substrate H1101 and the base member H1501 is applied. As the adhesive H2001, an adhesive having a low curing temperature, curing in a short time, and having ink resistance is desirable. For example, a thermosetting adhesive mainly composed of an epoxy resin can be used. Further, as a method for applying the adhesive H2001, a transfer coating method by screen, screen printing, a drawing coating method by dispensing, or the like can be adopted. In this embodiment, the adhesive H2001 is applied to the base member H1501 side, but the adhesive H2001 may be applied to the back surface side of the recording element substrate H1101.

  Here, the groove portions are separated from each other by an adhesive H2001 and sealed from the outside air, so that all the groove portions become an ink path between the ink outlet of the base member and the ink supply port of the recording element substrate. The groove and all the ink outlets are installed so as to be within the recording element substrate bonding (adhesion) region of the base member H1501.

  With the above configuration, the ink path between the ink outlet of the base member and the ink supply port of the recording element substrate is the groove and the back surface of the recording element substrate (the reverse side of the surface on which the electrothermal conversion element and the ejection port are arranged) ) And an adhesive.

  As described above, in an ink jet recording head using an electrothermal conversion element, the temperature rise (heat storage) of the recording element substrate occurs due to excessive thermal energy during ink liquid ejection. Further, when a general resin material is used as a constituent material of the base member as in the present invention and the adhesive for fixing the base member and the recording element substrate becomes thick, the temperature rise of the recording element substrate becomes excessive. End up.

  Here, according to the tubular ink path of the present invention, since the back surface portion of the recording element substrate is in direct contact with the ink in the ink path, the heat generated by the recording element substrate is quickly transmitted to the ink. can do. As a result, it is possible to suppress an excessive temperature rise of the recording element substrate.

(With ink consumption due to ejection, new ink is continuously replenished to the ejection port from the ink storage section through the ink path. As a result, heat generated in the recording element substrate is quickly and continuously transferred. be able to.)
FIG. 7 is a cross-sectional view taken along line AA of FIG. 6 after the recording element substrate H1101 and the base member H1501 are fixed using an adhesive H2001. The groove H1143 communicates with the two ink supply ports H1133a and 1133b in order to supply the ink taken out from the ink outlet H1153 (not shown) to the two ejection port arrays H1123a and H1123b of the recording element substrate H1101. The groove H1141 supplies ink to the two ejection port arrays H1121a and H1121b provided in the ink supply port H1131.

  Here, for example, it is assumed that yellow ink is extracted from the ink outlet H1151, magenta ink is extracted from H1152, and cyan ink is extracted from H1153. In this case, by providing the groove portion of the present invention, yellow ink can be supplied to the ejection port arrays H1121a and 1121b of the recording element substrate H1101, and magenta ink is ejected to the ejection port arrays H1122a and 1122b. It becomes possible to supply cyan ink to H1123a and H1123b. As a result, “reciprocating printing”, which is a means for speeding up the recording head in which the ejection port arrays related to the same type of ink are arranged symmetrically with respect to the scanning direction of the head, that is, the inkjet recording apparatus, is high. It is possible to provide a recording head that can be achieved while achieving both image quality and a simple configuration as described above.

  The following describes further best modes of the present invention.

  The shape (length) of the groove portions H1141, H1142, and H1143 in the present embodiment in the direction of the recording element substrate bonding surface is as shown in FIG. 8, that is, facing the entire area of the ink supply port of the recording element substrate H1101 that communicates. Even if not, it serves as an ink path. However, since the height of the ink path can take only the thickness of the recording element substrate H1101 on the downstream side of the ink supply from the end of the groove, the flow resistance of the ink supply becomes excessively large. Ink supply becomes scarce. Therefore, in order to sufficiently supply ink to all the ejection ports, the length of the groove is set to a length until it faces the entire area of the ink supply port as shown in FIG. Is preferably 0.1 or more.

  On the other hand, in order to quickly and efficiently transfer the heat generated by the recording element substrate to the ink, it is preferable that there are more regions in contact with the ink on the back surface of the recording element substrate. Therefore, it is preferable to set the width of the groove portion and its route to be as wide as possible (however, since the groove portion is sealed from the outside air by an adhesive and separated from each other, a minimum bonding margin is required. Needless to say.

  Furthermore, each ink outlet of the base member H1501 is preferably arranged at the center of the shape of the communicating groove portion in the direction of the recording element substrate bonding surface. In addition, it is preferable that the groove portions divided in two directions around the ink outlet arranged in the center have the same cross-sectional shape. As a result, the shape of the path to the two ink supply ports of the recording element substrate H1101 communicating with the groove is the same, that is, the ink flow resistance becomes equal, and ink can be supplied to each ink supply port without deviation. .

  On the other hand, the overall size of the recording element substrate is determined by the size of the arrangement area of the ink supply port and the arrangement of electrical wiring, fuses or resistors, and electrode portions arranged so as to avoid it. (A recording element substrate is generally manufactured by a large film forming process such as a Si wafer, and the number of pieces that can be cut out from the Si wafer, that is, the size of one recording element substrate reflects the manufacturing cost.) Therefore, the area where the ink supply ports of the recording element substrate H1101 are arranged is preferably as small as possible. As shown in FIG. 6, the plurality of ink supply ports of the recording element substrate H1101 have the same shape. It is preferable that they are arranged on substantially the same straight line.

  Further, in the forms shown in FIGS. 9 and 10, the corners inside the groove portions H1141, 1142 and 1143 are formed into spherical shapes. These are provided in order to make it difficult for bubbles to remain in the corners of the groove when the groove is filled with ink. Bubbles remaining in the groove will eventually move to the ejection port, and will cause ejection failure of ink droplets.

  Further, in order to further reduce the remaining of bubbles in the groove portion, a parent ink treatment of the groove portion, for example, a plasma treatment or a corona treatment may be performed.

  As described above, the embodiments of the present invention have been described in detail. However, the present invention is not limited to such embodiments, and these are combined or included in the concept of the present invention described in the claims of this specification. It can also be applied to other technologies to be done.

It is a schematic perspective view of the Example of this invention. 1 is a perspective view of a recording head that is an embodiment of the present invention. FIG. FIG. 3 is an exploded perspective view of the recording head illustrated in FIG. 2. FIG. 3 is a perspective view showing a part of the recording element substrate shown in FIG. It is a figure which shows the recording element board | substrate in the Example of this invention. It is a figure which shows the relationship between the recording element board | substrate and base member in the Example of this invention. It is sectional drawing which shows the joining state of the recording element board | substrate and base member in the Example of this invention. It is a figure which shows another form of the groove part in the Example of this invention. It is a figure which shows the shape of the groove part in another Example of this invention. It is sectional drawing which shows the joining state of the recording element board | substrate and base member in another Example of this invention.

Explanation of symbols

H1001 Recording head H1101 Recording element substrate H1102 Ink supply port H1104 Electrode terminal H1105 Bump H1106 Ink channel wall H1107 Discharge port H1110 Si substrate H1121a, 1121b, 1122a, 1122b, 1123a, 1123b Discharge port array H1131, 1132a, 1132b, 1133a, 1133b Ink supply port H1141, 1142, 1143 Groove H1151, 1152, 1153 Ink outlet H1201 Ink outlet H1301 Electrical wiring board H1302 External signal input terminal H1304 Lead terminal H1307 First sealant H1308 Second sealant H1501 Base member (Ink supply holding member)
H1601, 1602, 1603 Ink absorber H1701, 1702, 1703 Filter H1801 Seal member H1901 Lid member H1911, 1912, 1913 Narrow hole H1921, 1922, 1923 Fine groove H1925 Air communication port H1930 Engagement part H2001 Adhesive

Claims (8)

A recording element substrate having an ejection port through which ink droplets are ejected and a plurality of ink supply ports penetrating the front and back of the substrate for supplying ink to the ejection port;
A base member having a bonding surface of the recording element substrate and a plurality of ink outlets for supplying ink from an ink storage portion to an ink supply port of the recording element substrate;
An adhesive filled to fix the recording element substrate and the base member, and to seal an ink path between the ink supply port of the recording element substrate and the ink outlet port of the base member;
In an inkjet recording head comprising:
The recording element substrate bonding surface of the base member has a plurality of groove portions, all of the groove portions communicate with the ink outlet port, and at least one of the groove portions is connected to the plurality of ink supply ports of the recording element substrate. Communication,
An ink jet recording head, wherein the recording element substrate and the base member are fixed to form an ink path in which the groove portion forms one side surface on the back surface portion of the recording element substrate.   2. The ink jet recording head according to claim 1, wherein the groove is formed integrally with the base member.   3. The ink jet recording head according to claim 1, wherein all of the ink outlets and all of the grooves of the base member are disposed in a joining region of the recording element substrate of the base member.   The ink jet recording head according to claim 1, wherein the ink outlet of the base member is disposed at the approximate center of the communicating groove.   5. The ink jet recording head according to claim 4, wherein the groove portion of the base member has a substantially symmetric (same) shape with respect to a communicating ink outlet.   6. The ink jet recording head according to claim 1, wherein the plurality of ink supply ports of the recording element substrate have substantially the same shape and are aligned in substantially the same straight line.   The ink jet recording head according to claim 1, wherein the plurality of ink outlets of the base member supply different types of ink.   The ink jet recording head according to claim 1, wherein the base member is an integral ink storage portion.

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