JP2012030227A - Liquid body discharge head and liquid body discharge device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid body discharge head excellent in reliability, and a liquid body discharge device.SOLUTION: A liquid body introduction member 40 and a case 30 are joined through molten resin 51 in a joint part 52 that is an overlapping region of a flange part 43 and a flange mounting part 32. In the joint part 52, a projection 44 is formed on a lower surface of the flange part 43. In the joint part 52, a recessed part 45 is formed on the lower surface of the flange part 43 to be adjacent to the projection 44.

Description

  The present invention relates to a liquid material discharge apparatus such as an ink jet recording apparatus, a display manufacturing apparatus, an electrode forming apparatus, and a biochip manufacturing apparatus, and a liquid discharge head mounted on the liquid discharge apparatus.

  In recent years, liquid discharge heads having minute nozzles for discharging liquid have been widely used for printing and industrial applications. For example, the liquid discharge head described in Patent Document 1 includes a resin ink supply needle (liquid introduction member) for receiving supply of ink (liquid) from the outside. It is joined to the case (substrate) by sonic welding (fusion).

JP 2000-2111130 A

  By the way, especially in the liquid discharge head used for industrial applications, it is necessary to form the liquid introduction member and the case using a material excellent in chemical stability in order to deal with liquids having various physical properties. As a material that satisfies this requirement, a crystalline resin is effective. However, this material generally has a high melting temperature, and when this material is used for a liquid material introduction member and a case, welding becomes difficult. For this reason, there exists a subject that sufficient reliability cannot be acquired regarding the weldability (joining strength and sealability) in a junction part.

  SUMMARY An advantage of some aspects of the invention is that it provides a liquid discharge head and a liquid discharge apparatus that are excellent in reliability.

  The liquid discharge head according to the present invention includes a base on which a liquid supply channel is formed, and a liquid introduction member for introducing the liquid into the supply flow path, and is bonded to the base by welding. The liquid material introduction member, the liquid material introduction member and the base at the joint portion, the liquid material introduction member or the protrusion formed on the base material, and the joint portion at the liquid material introduction member or the And a recess formed in the substrate.

  According to the liquid discharge head of the present invention, since the protrusion and the recess are formed at the joint between the liquid introduction member and the substrate, both members (liquid The introduction member and the base body can be brought into contact with each other in a small area, and contact between both members can be reliably avoided at the location where the recess is formed. In this way, since the ultrasonic vibration energy can be suitably concentrated around the protrusions and the liquid material introducing member and the substrate can be suitably welded, the liquid material discharge head according to the present invention has a bonding portion. It has excellent reliability in terms of weldability.

  Further preferably, the liquid material discharge head includes a region for the protrusion of the molten member from the protrusion between the recess and the protrusion at the joint.

  While the concave portion serves to avoid dispersion of energy of ultrasonic vibration, it can also be a place where the molten member escapes from the projection, so if the concave portion is too close to the projection, the welding margin is reduced. It will end up. According to the liquid discharge head of the present invention, since the region for the protrusion of the melting member is provided between the protrusion and the recess, the above-described problems can be avoided.

Preferably, in the liquid discharge head, the inner surface of the recess is a curved surface.
According to the liquid material discharge head of the present invention, stress concentration on the inner surface of the concave portion can be suppressed, so that breakage of the liquid material introduction member can be suitably avoided at the time of manufacturing, particularly at the time of ultrasonic welding.

Also preferably, in the liquid discharge head, comprising: a flange portion joined to the base at one end of the liquid introduction member; and a guide portion that defines an outer periphery of the flange portion in the base. The protrusion is formed in a region inside the flange portion with respect to the protrusion.
According to the liquid discharge head of the present invention, since the protrusion of the melting member from the protrusion toward the outer peripheral surface of the flange portion is not hindered by the concave portion, between the outer peripheral surface of the flange portion and the guide portion, Good welding can be performed through the melting member.

Preferably, in the liquid discharge head, the liquid introduction member and the base are formed of a crystalline resin.
The liquid head according to the present invention can cope with various liquids due to the excellent chemical stability of the crystalline resin, and has excellent reliability with respect to the weldability of the joint.

The present invention is characterized in that the liquid discharge head is mounted.
Since the liquid discharge apparatus of the present invention is equipped with the liquid discharge head, it has excellent reliability with respect to the weldability of the joint.

The figure which shows the whole structure of a liquid discharger. The figure which shows the whole structure of a liquid discharge head. Sectional drawing which shows the periphery structure of a liquid body introduction member. The expanded sectional view of the junction part which shows an example of the process of ultrasonic welding. Sectional drawing which shows the periphery structure of the liquid body introduction member which concerns on a modification.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings.
The embodiment described below is a preferred specific example of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention is particularly limited in the following description. Unless otherwise stated, the present invention is not limited to these forms. In the drawings referred to in the following description, the vertical and horizontal scales of members or portions may be represented differently from actual ones for convenience of illustration.

(About the overall configuration of the liquid material discharge device)
First, the configuration of the liquid material discharge apparatus will be described with reference to FIG.
FIG. 1 is a diagram illustrating an overall configuration of a liquid material discharge apparatus.

  In FIG. 1, a liquid discharge apparatus 100 includes a stage 102 for placing a substrate 101, a carriage 103 facing the substrate 101, a liquid supply mechanism 106 for supplying a liquid to the carriage 103, and a discharge control circuit. 107. The stage 102 is reciprocated in the horizontal direction in the figure with respect to the carriage 103 by the main scanning mechanism 104 (main scanning), and the carriage 103 is moved in the direction orthogonal to the main scanning by the sub scanning mechanism 105 (sub scanning). Is done. The main scanning mechanism 104, the sub-scanning mechanism 105, and the discharge control circuit 107 are comprehensively controlled by the control computer 108.

  The liquid supply mechanism 106 includes, for example, a container that stores a plurality of types of liquid, a transfer pipe that transfers the liquid from the container, and a pressure control unit that controls the supply pressure of the liquid under a certain level. . As the liquid used, liquids such as water and organic solvents, and solutions thereof, as well as liquids in which solid fine particles are dispersed in a liquid, can be employed.

  The carriage 103 includes a plurality of liquid discharge heads 10 (see FIG. 2), and discharges the liquid from the nozzle 20 (see FIG. 2) onto the substrate 101 in response to an electric signal from the discharge control circuit 107. To do. Details will be described later.

  The liquid material ejecting apparatus 100 can arrange (draw) the liquid material in a pattern on the substrate 101 by ejecting the liquid material from the carriage 103 to an arbitrary position of the substrate 101. Then, the arranged liquid material can be solidified by drying or the like to form various patterned functional films.

(About the configuration of the liquid discharge head)
Next, the configuration of the liquid material discharge head will be described with reference to FIGS.
FIG. 2 is a diagram showing the overall configuration of the liquid material discharge head. FIG. 3 is a cross-sectional view showing the peripheral structure of the liquid material introduction member.

  The liquid discharge head 10 includes a case assembly 14 for introducing a liquid from a liquid supply mechanism 106 (see FIG. 1), a discharge assembly 15 for discharging the liquid, a discharge control circuit 107 (see FIG. 1), and a flexible wiring. And a circuit board 16 electrically connected via the board 110. The case assembly 14 includes a case 30 serving as a base body having a supply flow path 33 therein, and a liquid material introduction member 40 coupled to the outlet pipe 109 from the liquid material supply mechanism 106.

  The liquid material introduction member 40 is a hollow needle-like member having an introduction hole 42 in the pointed end portion 41 and an introduction flow path 46 therein, and the opposite side of the pointed end portion 41 is a flange portion 43 having an expanded hem. . The liquid material introduction member 40 is joined to the case 30 at the flange portion 43 by ultrasonic welding.

  The case 30 includes a guide portion 31 that defines an outer peripheral surface 43 a on the outer periphery of the flange portion 43, and a flange attachment portion 32 that receives the lower surface of the flange portion 43 on the inner side of the guide portion 31. The liquid introduced through the introduction hole 42 is supplied to the discharge assembly 15 through the introduction flow path 46, the filter 50, and the supply flow path 33.

  The filter 50 is a member formed by braiding a metal wire into a mesh shape, and is welded to a surface where the communication channel of the supply channel 33 is formed. The filter 50 plays a role of trapping foreign matters contained in the liquid material supplied from the introduction flow path 46 to the supply flow path 33. Note that the width of the introduction channel 46 and the supply channel 33 on the filter 50 side is widened in order to increase the effective area of the filter 50 and reduce the flow resistance (loss head) of ink related to passage. .

  The liquid material introduction member 40 and the case 30 are made of a crystalline resin excellent in chemical stability, in this embodiment, PPS (PolyPhenylene-Sulfide). This is a consideration for preventing erosion even by liquids of various chemical properties used in industrial applications. Moreover, it is also possible to reinforce strength and chemical resistance by using another material such as a glass material mixed with the above crystalline resin.

  Crystalline resins such as PPS generally have a higher melting temperature than amorphous resins, and are relatively difficult to handle during molding and welding. For this reason, in this embodiment, the liquid material introduction member 40 and the case 30 are molded at relatively high temperatures such as a mold temperature of 150 ° C. and a resin temperature of 300 ° C. Further, in the welding of the liquid material introducing member 40 and the case 30, the following devices are devised.

  The discharge assembly 15 includes nozzles 20 formed in a predetermined arrangement on one surface, cavities 22 communicating with each of the nozzles 20, and a reservoir 23 that supplies a liquid material to the cavities 22 for each corresponding liquid material type. . The canopy portion 24 of the cavity 22 is movable by the flexible film 25, and the liquid material is discharged from the nozzle 20 by driving the piezoelectric element 26 joined to the canopy portion 24. The drive control of the piezoelectric element 26 is performed for each nozzle 20 by an electrical signal transmitted through the flexible wiring board 110.

  The liquid material introduction member 40 and the case 30 are joined via a molten resin 51 as a molten member at a joint portion 52 that is an overlapping region of the flange portion 43 and the flange mounting portion 32. It also serves to seal the connection between the introduction flow path 46 and the supply flow path 33. The molten resin 51 is formed by melting a part of the liquid material introduction member 40 and the case 30 by ultrasonic welding described later.

  In the joint portion 52, a projection 44 (in FIG. 3, the tip is crushed by welding) is formed on the lower surface of the flange portion 43. The protrusion 44 is formed so as to draw a loop along the outer peripheral surface 43a of the flange portion 43, and has a triangular cross-sectional shape as indicated by an imaginary line before welding.

  In the joint portion 52, a recess 45 is formed on the lower surface of the flange portion 43 so as to be adjacent to the protrusion 44. The recess 45 is formed in a groove shape having a U-shaped cross section so as to be separated from the protrusion 44 at an appropriate distance and to draw a loop along the protrusion 44.

(About ultrasonic welding)
Next, an ultrasonic welding process between the liquid material introducing member and the case will be described with reference to FIG.
FIG. 4 is an enlarged cross-sectional view of a joint portion showing an example of a process of ultrasonic welding.

  As shown in FIG. 4, the ultrasonic welding presses a horn 55 that transmits ultrasonic vibrations from the upper surface of the flange portion 43 in a state where the projection 44 on the lower surface of the flange portion 43 is in contact with the flange mounting portion 32. Is done. The energy of the ultrasonic vibration is converted into frictional heat around the protrusions 44 that are in contact with the flange mounting portion 32, and the resin around the protrusions 44 is melted to generate a molten resin 51. That is, the protrusion 44 plays a role as an action part for concentrating the energy of ultrasonic vibration during ultrasonic welding.

  The lower surface of the flange portion 43 and the flange mounting portion 32 may not always be smooth due to variations in accuracy during molding. For example, in the illustrated example, the upper surface of the flange mounting portion 32 is greatly raised at the location indicated by the arrow A. . Even in such a case, since the recessed portion 45 is formed, the flange portion 43 and the flange mounting portion 32 are in contact with each other at the location indicated by the arrow A, and the energy of the ultrasonic vibration is not dispersed. . That is, the concave portion 45 plays a role of preventing the energy of ultrasonic vibration from being dispersed in a portion other than the projection 44 during ultrasonic welding, and thus the present embodiment using the PPS resin that is relatively difficult to melt. Also in the form, the liquid material introduction member 40 and the case 30 are suitably welded around the protrusion 44.

  The molten resin 51 spreads around the protrusions 44. However, if the recess 45 is too close to the protrusion 44, the molten resin 51 protruding from the protrusion 44 is taken into the recess 45, and a sufficient welding area is obtained. Can not be secured. For this reason, a region 47 for the molten resin 51 to protrude is provided between the projection 44 and the recess 45, so that such adverse effects are avoided.

  The protrusion 44 faces the outer peripheral surface 43a of the flange portion 43 and is formed in an inner region thereof. The molten resin 51 protrudes to the outer peripheral surface 43a of the flange portion 43 and realizes strong welding with the guide portion 31. To do. At this time, since the recess 45 is formed in a region inside the protrusion 44, the protrusion of the molten resin 51 to the outer peripheral surface 43 a is not hindered by the recess 45.

  As illustrated, the inner surface of the recess 45 is a curved surface. This is a consideration for preventing stress from being concentrated on the inner surface of the recess 45 when the horn 55 presses the upper surface of the flange portion 43. For example, if a corner is provided in the recess 45, stress may concentrate on the corner and a crack may occur in the flange portion 43 during ultrasonic welding. In this embodiment, such an adverse effect is avoided. It is what.

  The concave portion 45 can play its role as long as contact with the flange mounting portion 32 can be avoided, so it is preferable that the concave portion 45 not be excessively deep. This is because if the concave portion 45 is deep, a large amount of the molten resin 51 that has protruded is taken in, and the weldability may be reduced due to a decrease in the weld area. Moreover, it is because the thickness of the flange part 43 of the location in which the recessed part 45 is provided becomes thin, and there exists a possibility of producing a crack in the flange part 43 in the case of ultrasonic welding. In the present embodiment, the height of the protrusion 44 (before welding) is 0.2 mm, whereas the depth of the recess 45 is 0.14 mm.

(Modification)
Next, with reference to FIG. 5, a modified example will be described focusing on differences from the previous embodiment.
FIG. 5 is a cross-sectional view showing a peripheral structure of a liquid material introducing member according to a modification.

  In this modification, the concave portion 48 is formed on the flange mounting portion 32 side in the joint portion 52, and plays the same role as the above-described embodiment. As in this modification, the recess according to the present invention may be formed on the case side. Further, the protrusion may be formed on the case side (flange mounting portion) instead of being formed on the liquid material introduction member side (flange portion) or on the liquid material introduction member side.

The present invention is not limited to the above-described embodiment.
For example, the projections and the recesses according to the present invention can be formed in various shapes at various positions in the joint portion between the liquid material introduction member and the case within the scope not departing from the spirit of the present invention. If a specific example is given, you may form a protrusion and a recessed part discretely in the lower surface of a flange part.
Moreover, each structure of embodiment can combine these suitably, can be abbreviate | omitted, or can combine with the other structure which is not shown in figure.

  DESCRIPTION OF SYMBOLS 10 ... Liquid body discharge head, 14 ... Case assembly, 30 ... Case as base | substrate, 31 ... Guide part, 32 ... Flange mounting part, 33 ... Supply flow path, 40 ... Liquid body introduction member, 41 ... Pointed part, 42 ... Introducing hole 43 ... Flange part 43a Outer peripheral surface of flange part 44 ... Protrusion 45 ... Concave part 46 ... Introducing flow path 47 ... Area for protruding molten resin 48 ... Concave part 50 ... Filter 51 ... Molten resin as a melting member, 52 ... Joint, 55 ... Horn, 100 ... Liquid material discharge device.

Claims (6)

A substrate on which a liquid supply channel is formed;
A liquid material introduction member for introducing the liquid material into the supply flow path, wherein the liquid material introduction member is joined to the substrate by welding;
A projection formed on the liquid material introducing member or the base at the joint between the liquid material introducing member and the base; and
A liquid discharge head comprising: the liquid introduction member or a recess formed in the base at the joint.   2. The liquid discharge head according to claim 1, wherein an area for the protrusion of the molten member from the protrusion is provided between the concave portion and the protrusion in the joint portion.   The liquid discharge head according to claim 1, wherein an inner surface of the recess is a curved surface. 4. The liquid according to claim 1, further comprising: a flange portion that is joined to the base at one end of the liquid introduction member; and a guide portion that defines an outer periphery of the flange portion in the base. A body discharge head,
The liquid discharge head according to claim 1, wherein the recess is formed in a region inside the flange portion with respect to the protrusion.   The liquid discharge head according to any one of claims 1 to 4, wherein the liquid introduction member and the base are formed of a crystalline resin.   A liquid material discharge apparatus equipped with the liquid material discharge head according to any one of claims 1 to 5.

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