JP2010208130A - Method for fixing channel forming member for liquid drop ejection head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixing method for fixing a base composing the bottom of a channel, to a frame forming the periphery of the channel of a liquid drop ejection head, making a material selection easy. <P>SOLUTION: The frame 120 is expanded more than the base 150 by leaving the frame 120 in a high temperature environment. While a gap 145 between the internal walls 122 of the frame 120 and the external walls 152 of the base 150 is widened, a gasket 140 is disposed in the gap 145, thereby fitting the frame 120 and the base 150 together. Next, the temperature of the environment is decreased to room temperature from the high temperatures. Consequently, the frame 120 contracts more than the base 150, enabling the gap 145 between the internal walls 122 of the frame 120 and the external walls 152 of the base 150 to be narrowed. Consequently the gasket 140 elastically deforms, comes into close contact to the frame 120 and base 150 and tightly closes (seals) the gap. Accordingly, the base 150 is fixed in the frame 120. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fixing method of a flow path forming member of a droplet discharge head, and more particularly to a fixing method of fixing a base material portion constituting the bottom portion of the flow passage to a frame portion constituting the periphery of the flow passage.

  In an inkjet recording head (droplet discharge head), when bonding (fixing) the members constituting the ink flow path, an adhesive having excellent liquid resistance (ink resistance) such as an epoxy adhesive is used. The members are often bonded together. However, it is difficult to achieve both excellent adhesion performance (fixing performance) and excellent liquid resistance.

  Therefore, a method of coating (applying) an elastic adhesive so as to cover the elastic adhesive with a coating agent having excellent liquid resistance has been proposed (for example, see Patent Document 1).

JP 2007-216632 A

  However, the method of coating (applying) an elastic adhesive with a coating agent having excellent liquid resistance requires a complicated manufacturing process (manufacturing process). In addition, it is difficult to uniformly coat with a coating agent so that voids are not formed on the surface of the elastic adhesive.

  Furthermore, from various combinations of ink (liquid), each member, adhesive, and coating agent, it is easy to examine the adhesive performance, liquid resistance, compatibility, etc., and find the optimal combination that can ensure high reliability. Not a thing.

  In view of the above, the present invention provides a fixing method for fixing a base material portion constituting the bottom portion of the flow path to a frame portion constituting the periphery of the flow path of the droplet discharge head, which facilitates material selection. Is the purpose.

  The invention according to claim 1 is a fixing method for fixing the base material part constituting the bottom part of the flow path to the frame part constituting the periphery of the flow path of the droplet discharge head, wherein the frame part has a thermal expansion coefficient. The base material portion is made of a material having a smaller thermal expansion coefficient than the frame portion, and the temperature of the frame portion is higher than the operating environment temperature of the droplet discharge head. The first step of inserting and assembling the base material part on the inner side, and disposing an elastic member in the gap between the inner wall of the frame part and the outer wall of the base material part facing the inner wall of the frame part, The temperature environment is lowered from the high temperature to the use environment temperature, the frame portion contracts more than the base material portion, and the gap is narrowed to elastically deform the elastic member, and the base material portion is fixed to the frame portion. A second step of forming a periphery of the flow path of the droplet discharge head Fixing method for fixing the substrate portion that constitutes the bottom portion of the flow path section.

  In the first aspect of the present invention, the frame portion is expanded more than the base material portion, that is, the inner wall of the frame portion and the outer wall of the base material portion. In a state where the gap is widened, the base part is inserted into the frame part and assembled, and an elastic member is disposed in the gap between the inner wall of the frame part and the outer wall of the base part.

  Then, the temperature environment is lowered from the high temperature to the use environment temperature, and the frame portion shrinks more than the base material portion and the gap becomes narrower, so that the elastic member is elastically deformed and closely adheres to seal (seal) the gap. The base material portion is fixed to the frame portion by the pressing force of the member pressing the wall.

  That is, the base material portion constituting the bottom portion is fixed to the frame portion constituting the periphery of the ink flow path without using an adhesive.

  Therefore, the material selection of the frame part, the base material part, and the elastic member changes the liquid resistance against the liquid flowing through the flow path (even if the liquid is immersed (contacted)) without considering the adhesiveness of the adhesive. It is sufficient to select a material that is difficult to adhere) (a material that is difficult to bond but has excellent liquid resistance can be selected).

  For this reason, material selection is facilitated, and the degree of freedom in material selection is greatly expanded. Therefore, it is possible to easily achieve both excellent fixing performance (fixing force for fixing the base material portion to the frame portion) and excellent liquid resistance.

  In addition, when the base material part is bonded to the frame part with an adhesive, a difference in expansion or contraction between the frame part and the base material part due to a difference in thermal expansion coefficient occurs due to a temperature change, and is bonded and integrated. There is a possibility that deformation such as warpage occurs in the frame portion and the base material. However, in the present invention, since the expansion difference or the contraction difference is absorbed by the change in the crushing amount of the elastic member, deformation such as warpage is prevented or suppressed.

  According to a second aspect of the present invention, the frame part or the base material part is composed of a liquid crystal polymer.

  In the invention of claim 2, the frame part or the base material part is composed of a liquid crystal polymer. Liquid crystal polyper has excellent liquid resistance against various liquids, but is considered to be a material that is difficult to adhere and bond. However, since this fixing method has excellent fixing performance without using an adhesive, it can be realized as liquid resistance using a liquid crystal polymer.

  According to the first aspect of the present invention, material selection becomes easy, and as a result, excellent fixing performance and excellent liquid resistance can be easily achieved.

  In the second aspect of the invention, by using the liquid crystal polymer, it is possible to provide a flow path of a droplet discharge head having excellent liquid resistance.

FIG. 2 is an exploded perspective view schematically showing a main part of the ink jet recording head of the first embodiment manufactured by applying the fixing method of the present invention. (A) is a perspective view which shows typically the principal part of the inkjet recording head of 1st embodiment manufactured by applying the fixing method of this invention, (B) is a BB line of (A). FIG. It is a disassembled perspective view which shows typically the principal part of the inkjet recording head of 2nd embodiment manufactured by applying the fixing method of this invention. (A) is a perspective view which shows typically the principal part of the inkjet recording head of 2nd embodiment manufactured by applying the fixing method of this invention, (B) is a BB line of (A). FIG. FIG. 6 is a process diagram sequentially illustrating, from (A) to (C), a state in which a base material part constituting the bottom part of the ink flow path is fixed to a frame part constituting the periphery of the ink flow path of the ink jet recording head. FIG. 5 is an explanatory diagram for explaining that deformation such as warpage does not occur even when the temperature of the frame portion and the base material portion constituting the periphery of the ink flow path of the ink jet recording head is changed, and (B) is a diagram showing a reference state (A) is a figure of the state which temperature rose from the state of (B), (C) is a figure of the state from which the temperature fell from the state of (B).

  A fixing method for fixing the substrate portion to the frame portion of the droplet discharge head according to the first embodiment of the present invention will be described with reference to FIGS. 1, 2, 5, and 6.

  First, the main part of the inkjet recording head 100 assembled (manufactured) by applying the fixing method of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is an exploded perspective view schematically showing a main part of the ink jet recording head 100 of the first embodiment manufactured by applying the fixing method of the present invention. FIG. 2A is a perspective view schematically showing the main part of the inkjet recording head 100 of the first embodiment manufactured by applying the fixing method of the present invention (the assembly diagram of FIG. 1). FIG. 2B is a cross-sectional view taken along line BB in FIG.

  As shown in FIG. 1 and FIG. 2, the essential parts of the inkjet recording head 100 are a plate-like base member 150 having a substantially square shape in plan view, a frame portion 120 having a square shape in plan view, and an elastic body having a square frame shape. The gasket 140 configured as described above is configured as a main component. The frame portion 120 is formed around the ink flow path 110, and the base material portion 150 forms the bottom portion of the ink flow path 110.

  A nozzle plate (not shown) in which a plurality of nozzles (not shown) for ejecting ink droplets is formed is joined to the lower surface of the substrate part 150 (the substrate part 150 and the nozzle plate are integrated). ).

  In addition, a plurality of pressure chambers (not shown) communicating with each nozzle (not shown) and an ink path (not shown) communicating with the pressure chambers are formed inside the base member 150. The pressure chamber wall surface portion is provided with pressure generating means (for example, a piezo element or a heating element) for generating pressure in the pressure chamber and discharging ink droplets from the nozzles. A plurality of openings 156 of an ink path (not shown) communicating with the pressure chamber are formed in the upper surface portion 154 of the base material portion 150. In addition, the structure of the inside of the base material part 150 demonstrated here or a nozzle is an example, Comprising: It is not limited to this. Other structures may be used.

  As shown in FIG. 2, the gasket 140 is sandwiched between the outer wall 152 (see FIG. 1) of the base member 150 and the inner wall 122 of the frame portion 120 and is elastically deformed and crushed, and the outer wall 152 and the frame portion of the base member 150. The inner wall 122 of 120 and the gap 145 are sealed (sealed). Further, the base material part 150 is fixed to the frame part 120 by the pressing force that presses the inner wall 122 and the outer wall 52 generated by the gasket 140 being elastically deformed and crushed (the base material part 150 and the frame part 120 are integrated with each other). ).

  As described above, in the inkjet recording head 100, the frame portion 120 is configured around the ink flow path 110, and the base material portion 150 that forms the bottom portion of the ink flow path 110 is fitted and fixed inside the frame portion 120. It has a structure. Then, the ink sent from the ink tank (not shown) is filled into the frame portion 120, and the filled ink passes through the opening portion 156 formed in the upper surface portion 154 of the base material portion 150 and the inside of the base material portion 150. A pressure chamber (not shown) is filled through the ink path formed in The ink filled in the pressure chamber is ejected from a nozzle (not shown) by a pressure changing means (not shown).

  The frame portion 120, the substrate portion 150, and the gasket 140 are made of a material excellent in ink resistance (liquid resistance) with respect to the ink used in the inkjet recording head 100, that is, even if the ink comes into contact (soaked in the ink). Also, it is made of a material that does not change easily.

  Further, the thermal expansion coefficient (thermal expansion coefficient) K1 of the frame part 120 is assumed to be larger than the thermal expansion coefficient (thermal expansion coefficient) K2 of the base material part 150 (K1> K2).

For example, examples of materials having excellent ink resistance and a large linear expansion coefficient applied to the frame portion 120 include resin materials such as epoxy materials, acrylic materials, and liquid crystal polymers (the thermal expansion coefficient K1 is about several tens of tens). × 10 ⁻⁶ / ° C.).

Examples of materials that are excellent in ink resistance and that have a smaller linear expansion coefficient than that of the frame 120 are silicon, silicon nitride, aluminum nitride, and the like (the thermal expansion coefficient K2 is about several × 10 × 10). ⁻⁶ / ° C.).

  In addition, examples of the elastic body excellent in ink resistance applied to the gasket 140 include fluorine rubber.

  Next, a method of fixing the frame portion 120 and the base material portion 150 that form the periphery of the ink flow path 110 of the inkjet recording head 100 will be described with reference to FIG. FIG. 5 shows, in order from (A) to (C), a state in which the base material part 150 constituting the bottom part is fixed to the frame part 120 constituting the periphery of the ink flow path 110 of the ink jet recording head 100. It is process drawing.

  As shown in FIG. 5A, first, the frame part 120, the base material part 150, and the gasket 140 are left in a high temperature environment. As the temperature rises, the frame part 120 and the base part 150 thermally expand. At this time, since the thermal expansion coefficient K1 of the frame part 120 is larger than the thermal expansion coefficient K2 of the base material part 150, the frame part 120 expands more than the base material part 150.

  As shown in FIG. 5 (B), the base material part 150 is inserted and assembled inside the frame part 120 in a state where it is thermally expanded in a high temperature environment. Further, the gasket 140 is disposed in the gap 145 between the inner wall 122 of the frame portion 120 and the outer wall 152 of the base material portion 150. At this time, the gap 145 between the inner wall 122 of the frame portion 120 and the outer wall 152 of the base material portion 150 has a width t1 larger than normal temperature due to a difference in thermal expansion. The width t1 of the gap 145 is set larger than or almost the same as the thickness h of the gasket 140, so that the frame portion 120 and the base material portion 150 can be easily arranged in the gap 145 in the gasket 140. Can be assembled.

  At this time, the gasket 140 is not elastically deformed or hardly elastically deformed.

  Next, as shown in FIG. 5C, the temperature is lowered to room temperature. At this time, since the thermal expansion coefficient of the frame part 120 is larger than that of the base material part 150, the frame part 120 contracts more than the base material part 150. That is, the gap 145 between the inner wall 122 of the frame portion 120 and the outer wall 152 of the base material portion 150 is narrowed (the width t1 becomes the width t2). The width t2 is set to be narrower than the thickness h of the gasket 140. When the gap 145 is narrowed from the width t1 to the width t2, the gasket 140 is elastically deformed and crushed. The gap 140 is sealed (sealed) when the gasket 140 is elastically deformed and crushed, and the base member 150 is fixed to the frame 120 by the pressing force generated when the gasket 140 is elastically deformed and crushed ( The base material part 150 and the frame part 120 are integrated).

Here, for example, when the length of the base portion 150 is 50 mm, the linear expansion coefficient is 2 × 10 ⁻⁶ / ° C., and the thermal expansion coefficient of the frame portion 120 is 20 × 10 ⁻⁶ / ° C., 25 ° C. When the temperature is lowered from (normal temperature) to 125 ° C. (high temperature) (temperature difference 100 ° C.), a shrinkage difference of 50 mm × 1000 ° C. × (20−2) = 90 μm occurs. The shrinkage difference (difference value) elastically deforms the gasket 140.

  The width of the gap 145 under high temperature is such that the gap 145 is hermetically sealed (sealed) by the elastic deformation of the gasket 140 and the base member 150 is fixed to the frame part 120 by the pressing force generated thereby. It goes without saying that various specifications (size of each member, thermal expansion coefficient, etc.) are set so that t1, the width t2 of the gap 145 at room temperature, the thickness h of the gasket 140, and the like are appropriate values.

  The high temperature environment is set higher than the use temperature environment of the inkjet recording head 100. The operating temperature environment of the ink jet recording head 100 is not only the environmental temperature (outside air temperature) in which the image forming apparatus (not shown) on which the ink jet recording head 100 is mounted is used, but also the influence of, for example, the power supply inside the image forming apparatus. When the inkjet recording head 100 becomes higher than the environmental temperature (outside air temperature) due to the temperature rise due to the above, the temperature rise is also taken into consideration.

  Next, functions and effects of the present embodiment will be described.

  As described above, the frame portion 120 is expanded more than the base material portion 150 by leaving it in a high temperature environment, and the gap 145 between the inner wall 122 of the frame portion 120 and the outer wall 152 of the base material portion 150 is widened. The gasket 140 is arranged in the gap 145 at (width t1), and the frame portion 120 and the base material portion 150 are assembled.

  Then, the temperature environment is lowered from high temperature to room temperature, the frame part 120 is contracted more than the base part 150 and the gap 145 is narrowed (by narrowing the width t1 to the width t2), and the gasket 140 is crushed and adhered. Then, the base member 150 is fixed to the frame portion 120 by pressing force.

  That is, the base material part 150 constituting the bottom part is fixed to the frame part 120 constituting the periphery of the ink flow path 110 of the inkjet recording head 100 without using an adhesive. In other words, the frame part 120 and the base material part 150 are integrated without joining (rigidly joining) the frame part 120 and the base material part 150.

  Therefore, the material selection of the frame part 120, the base material part 150, and the gasket 140 is based on the ink resistance (liquid resistance) with respect to the ink flowing through the ink flow path 110 without considering the adhesiveness due to the adhesive. (Materials that are difficult to adhere but have excellent liquid resistance can be selected).

  This facilitates material selection and greatly increases the degree of freedom in material selection. Therefore, it is possible to easily achieve both excellent fixing performance and excellent liquid resistance at the fixing part (fitting part) between the frame part 120 and the base part 150 constituting the periphery of the ink flow path 110 of the ink jet recording head 100. be able to.

  In addition, by constituting the frame part 120 or the base part 150 with a liquid crystal polymer, the ink flow path 110 of the ink jet recording head 100 having excellent liquid resistance against various inks (liquids) is obtained. The liquid crystal polymer has excellent liquid resistance against various liquids (inks), but is a material that is difficult to adhere and bond.

  However, since this fixing method has excellent fixing performance without using an adhesive, excellent liquid resistance can be achieved using a liquid crystal polymer.

  In addition, by applying the present invention, not only a liquid crystal polymer but also adhesive bonding is difficult, but a material having excellent liquid resistance can be used.

  Here, when the frame part 120 and the base material part 150 are bonded and integrated with an adhesive (when rigidly joined), a difference in expansion or contraction between the frame part 120 and the base material part 150 with a temperature change. Therefore, the integrated frame portion 120 and base material portion 150 may be deformed such as warpage.

  However, in the present invention, the frame part 120 and the base material part 150 are integrated without joining (rigidly joining) the frame part 120 and the base material part 150. Therefore, as shown in FIG. 6, if the gasket 140 is in a range where the gasket 140 is elastically deformed and the fixing performance is ensured, the gap 145 becomes “(A) width t3 ← → (B) width t2 ← → (C) width t1. ", Thereby changing the collapse allowance of the gasket 140, so that the difference in expansion or contraction associated with the temperature change is absorbed. Therefore, deformation such as warpage of the integrated frame portion 120 and base material portion 150 is prevented or suppressed.

  FIG. 6 is an explanatory diagram for explaining that the base material part 150 and the frame part 120 constituting the ink flow path of the ink jet recording head do not undergo deformation such as warpage even when the temperature changes, and FIG. (A) is a figure of the state where temperature rose from the state of (B), (C) is a figure of the state where temperature fell from the state of (B).

  Next, an ink jet recording head according to a second embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the member same as 1st embodiment, and the overlapping description is abbreviate | omitted.

  FIG. 3 is an exploded perspective view schematically showing a main part of the ink jet recording head 200 of the second embodiment manufactured by applying the fixing method of the present invention. 4A is a perspective view schematically showing the main part of the inkjet recording head 200 of the second embodiment manufactured by applying the fixing method of the present invention (the assembly diagram of FIG. 3). ). FIG. 4B is a cross-sectional view taken along line BB in FIG.

  As shown in FIGS. 3 and 4, the ink jet recording head 200 includes a plate-shaped base portion 250 having a substantially square shape in plan view, a frame portion 220 having a letter shape in plan view, and a square frame formed of an elastic body. The gaskets 242 and 244 are configured as main constituent members. A frame portion 220 is formed around the ink flow paths 210 and 212, and a base portion 250 is formed at the bottom of the ink flow paths 210 and 212.

  The frame portion 220 is provided with a connecting beam portion 224 that connects the inner walls 222 that face each other in plan view. In other words, the frame part 220 includes two frame parts 220A and 220B.

  A concave groove 258 that is wider than the width of the connecting beam portion 224 of the frame portion 220 is formed in the central portion of the base material portion 250. In other words, the base material part 250 is composed of two base material parts 250A and 250B.

  Similarly to the first embodiment, the base member 250 is joined to the lower surface thereof with a nozzle plate (not shown) in which a plurality of nozzles (not shown) for discharging ink droplets are formed. Further, the internal structure is also provided with a pressure chamber (not shown), an ink path (not shown), and a pressure generating means (for example, a piezo element or a heating element) as in the first embodiment. A plurality of openings 256 of ink paths (not shown) communicating with the pressure chambers are formed on the upper surface 254 (254A, 254B) of the base member 250.

  As shown in FIG. 4, the gasket 244 is sandwiched between the inner wall 222 of the frame portion 220 and the inner wall 223A of the connecting beam portion 224, and the outer wall 252 of the base member portion 250 and the side wall 260A of the concave groove 258, and elastically deformed. Then, it is hermetically sealed by being crushed. Similarly, the gasket 242 is sandwiched in the gap 245 between the inner wall 222 of the frame portion 220 and the inner wall 223B of the connecting beam portion 224 and the outer wall 252 of the base member portion 250 and the side wall 260B of the concave groove 258, and is elastically deformed and crushed. Is sealed (sealed). Moreover, the base material part 250 is fixed to the frame part 220 by the pressing force generated when the gaskets 242 and 244 are elastically deformed and crushed (the base material part 250 and the frame part 220 are integrated).

  A frame portion 220A is configured around the ink flow path 210, and a base material portion 250A (upper surface portion 254A side) that forms the bottom of the ink flow path 210 is fitted and fixed to the frame portion 220A. The frame portion 220B is configured around the ink flow path 212, and the base portion 250B (the upper surface portion 254B side) that forms the bottom of the ink flow path 212 is fitted into the frame portion 220B and fixed. Yes.

  Then, the ink sent from the ink tank (not shown) is filled into the frame portions 220A and 220B, and the filled ink is supplied from the openings 256 formed in the upper surface portions 254A and 254B of the base material portion 250 to the base material. The pressure chamber (not shown) is filled through an ink path formed inside the portion 250. The ink filled in the pressure chamber is ejected from a nozzle (not shown) by a pressure changing means (not shown).

  Further, the frame part 220 is made of a material having excellent ink resistance and a thermal expansion coefficient (thermal expansion coefficient) of the base material part 250 having a large thermal expansion coefficient (thermal expansion coefficient). The base member 150 is made of a material that has excellent ink resistance and a smaller linear expansion coefficient (thermal expansion coefficient) than the frame 120.

  In addition, since the specific material and thermal expansion coefficient of the frame part 220, the base-material part 250, and the gaskets 242 and 244 are the same as that of 1st embodiment, detailed description is abbreviate | omitted.

  Further, the fixing method of the frame portion 150 (150A, 150B) and the base portion 250 (205A, 250B) constituting the periphery of the ink flow paths 210, 212 of the ink jet recording head 200 is the same as in the first embodiment. is there. Therefore, it will be briefly described below.

  That is, first, the base material part 250 is inserted into the frame part 220 and the gaskets 242 and 244 are disposed in the gaps 245 and 247 in a state where the frame part 220 and the base material part 250 are thermally expanded in a high temperature environment. To do. At this time, the connecting beam part 224 of the frame part 220 is assembled so as to fit into the concave groove 258 of the base part 250.

  In other words, the gasket 242 is disposed in the gap 247 between the frame part 220A and the base material part 250A, and the gasket 244 is disposed in the gap 245 between the frame part 220B and the base material part 250B.

  Then, by lowering the temperature to room temperature, the gaskets 242 and 244 are elastically deformed and crushed. The gaps 245 and 247 are sealed (sealed) by the elastic deformation of the gaskets 242 and 244, and the base member 250 is applied to the frame portion 220 by the pressing force generated by the elastic deformation of the gaskets 242 and 244. Fixed (base material portion 250 and frame portion 220 are integrated).

  As in the first embodiment, the operational effects of the present embodiment are also the frame portions 220 (frame portions 220A and 220B) that form the periphery of the ink flow paths 210 and 212 of the inkjet recording head 200 without using an adhesive. The base material part 250 (base material parts 250A, 250B) is fixed to. In other words, the frame portion 220 (frame portions 220A and 220B) without joining (rigidly joining) the frame portion 220 (frame portions 220A and 220B) and the base material portion 250 (base material portions 250A and 250B). And the base material part 250 (base material parts 250A, 250B) are integrated.

  Therefore, the material selection of the frame part 220, the base material part 250, and the gaskets 242 and 244 should be selected based on the ink resistance to the ink flowing through the ink flow paths 210 and 212 without considering the adhesiveness due to the adhesive. That's fine.

  This facilitates material selection and greatly increases the degree of freedom in material selection. Accordingly, the fixing part (fitting part) between the frame part 220 (frame parts 220A and 220B) and the base part 250 (base parts 250A and 250B) that form the periphery of the ink flow paths 210 and 212 of the ink jet recording head 200. It is possible to easily achieve both excellent fixing performance and excellent liquid resistance.

  Further, by forming the frame part 220 or the base part 250 with a liquid crystal polymer, the ink flow paths 210 and 212 of the ink jet recording head 200 having excellent liquid resistance against various inks (liquids) are obtained. Liquid crystal polyper has excellent liquid resistance against various inks (liquids), but is a material that is difficult to adhere and bond. However, since this fixing method has excellent fixing performance without using an adhesive, excellent liquid resistance can be achieved using a liquid crystal polymer. By applying the present invention, not only a liquid crystal polymer but also adhesive bonding is difficult, but a material having excellent liquid resistance can be used as a channel substrate.

  The present invention is not limited to the above embodiment. Needless to say, various embodiments can be implemented without departing from the scope of the present invention.

  For example, in the above-described embodiment, the frame portion and the base material portion have a quadrangular shape in plan view, but are not limited thereto. For example, a polygonal shape or a circular shape (including an ellipse) other than the rectangular shape may be used.

  Further, for example, the ink jet recording head is a so-called on-demand ink jet recording head, but may be another type of ink jet recording head. For example, the present invention can be applied to a charging (continuous) ink jet recording head. In addition, since the charging type (continuous type) ink jet often uses solvent-based ink such as MEK, it is preferable to apply the present invention.

  The liquid ejected from the ink jet recording head (droplet ejection head) to which the present invention is applied is not limited to the ink used for image formation. The present invention can be applied to an ink jet recording head (droplet discharge head) that discharges droplets for various industrial uses.

100 Inkjet recording head (droplet ejection head)
110 Ink channel (channel)
120 Frame portion 122 Inner wall 140 Gasket (elastic member)
150 base material part 152 outer wall 200 inkjet recording head (droplet ejection head)
210 Ink channel (channel)
212 Ink flow (flow path)
220 Frame portion 220A Frame portion 220B Frame portion 222 Inner wall 223A Inner wall 223B Inner wall 242 Gasket (elastic member)
244 Gasket (elastic member)
250 base material part 250A base material part 250B base material part 252 outer wall 260A side wall (outer wall)
260B Side wall (outer wall)

Claims (2)

A fixing method of fixing a base material part constituting the bottom part of the flow path to a frame part constituting the periphery of the flow path of the droplet discharge head,
The frame portion is made of a material having a large thermal expansion coefficient, and the base material portion is made of a material having a smaller thermal expansion coefficient than the frame portion,
In a temperature environment higher than the use environment temperature of the droplet discharge head, the base member is inserted and assembled inside the frame, and the inner wall of the frame and the inner wall of the frame are opposed to each other A first step of disposing an elastic member in a gap between the outer wall of the base member and
The temperature environment is lowered from the high temperature to the use environment temperature, the frame portion contracts more than the base material portion, and the gap is narrowed to elastically deform the elastic member, and the base material portion is fixed to the frame portion. A second step to perform,
A fixing method for fixing a base material part constituting the bottom part of the flow path to a frame part constituting the periphery of the flow path of the liquid droplet ejection head having the above.   The fixing method according to claim 1, wherein the frame part or the base material part is made of a liquid crystal polymer.

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