JPH04358841A - inkjet recording head - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of an ink jet recording head.

0002

2. Description of the Related Art In an ink jet recording head, in order to achieve high print quality and always obtain stable printing effects, ink ejected from nozzles must always be ejected perpendicularly to the nozzle surface.

[0003] When the nozzle plate that constitutes the nozzle and the inkjet recording head substrate that constitutes the ink flow path are formed separately and bonded together with an adhesive, etc., it is necessary to make sure that the adhesive does not protrude to the nozzle and the ink flow path. An adhesive method is required.

FIGS. 4(a) and 4(b) are structural diagrams showing a conventional nozzle plate bonding method. The nozzle plate 2 and the inkjet recording head substrate 1 are assembled by coating the adhesive 9 on the surface of the inkjet recording head substrate 1 as shown in FIG.
It is bonded using the bonding method shown in b).

FIG. 5 is a cross-sectional view showing a conventional method of manufacturing an ink jet recording head. In the figure, a metal plate 10 and an inkjet recording head substrate 1 are bonded together by pressure and thermocompression after a thin plate-like adhesive film 5 having an adhesive function is sandwiched therebetween (a). After adhesion, the nozzle 2 and ink flow path 4, which were blocked by laser processing or the like, are penetrated by post-processing (b).

[0006]

[Problems to be Solved by the Invention] However, when the nozzle plate 2 and the inkjet recording head substrate 1 are bonded together as in the conventional method shown in FIG. There is a possibility that the adhesive 9 may protrude or block the nozzle 3 and the ink flow path 4.

As a result, as shown in FIG. 6(b), the ink 11 ejected from the nozzle 3 is bent toward the protruding side.
The nozzle is not always ejected perpendicularly to the nozzle surface, but is bent in a direction different from the original ejection direction, the ejection speed changes, or even stops being ejected. For this reason, there has been a problem in that stable printing effects cannot always be obtained and high printing quality cannot be ensured.

Furthermore, when the metal plate 10 and the inkjet recording head substrate 1 are bonded together with the adhesive film 5 as shown in the conventional method shown in FIG. Put it away. For this reason, Fig. 5(b)
) requires a manufacturing process in which the ink flow path 4 blocked by the adhesive film 5 must be penetrated by laser processing and a nozzle must be formed at the same time, which increases manufacturing costs. In addition, the laser processing accuracy itself is directly related to the ink ejection characteristics, and the nozzle 2 and ink flow path 4
Although it is possible to control the shape and dimensions of the laser beam, there is a problem in that the laser processing may not be sufficiently controlled.

SUMMARY OF THE INVENTION The present invention is intended to solve these conventional problems, and its purpose is to provide inkjet recording that does not allow adhesive to protrude into the nozzles and ink flow paths and is easy to manage in terms of manufacturing. The purpose is to provide the head.

0010

Means for Solving the Problems An inkjet recording head of the present invention is provided with a nozzle for ejecting ink, and a nozzle plate having a nozzle surface substantially perpendicular to an axis of ink ejection from the nozzle, which forms an ink flow path. In an inkjet recording head that is bonded to an inkjet recording head substrate on which a It is characterized by being glued.

[0011] Also, the hole on the adhesive film is larger in diameter than the nozzle formed in the inkjet recording head substrate and 2 to 20 times the diameter of the ink flow path. .

[0012] Also, the adhesive film is characterized in that a hole is provided in the adhesive film, a gap material is inserted into the hole, and the nozzle plate and the inkjet recording head substrate are bonded together.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a structural diagram showing the structure of an ink jet recording head showing an embodiment of the present invention. Figure 1(a) is a plan view of the inkjet recording head, and Figure 1(b) is Figure 1.
The AA sectional view of (a) is shown.

In the figure, a nozzle plate 2 having nozzles 3 is attached to the front surface of an ink jet recording head substrate 1 having ink channels 4 by means of an adhesive film 5 in which holes 6 corresponding to the nozzles 3 and ink channels 4 are formed in advance. Pressure and heat crimped.

According to the above structure, since the adhesive film 5 has holes 6 at positions corresponding to the nozzles 3, the adhesive film 5 does not protrude to the ink flow path 4 and the nozzles 3 even after adhesion. Therefore, stable ink ejection can be ensured and high print quality can be ensured.

The holes 6 in the adhesive film are formed by a press processing method, and the diameter d1 of the holes 6 is reduced after pressure bonding, so the diameter d1 must not become smaller than the diameter of the ink flow path 4 and the diameter of the nozzle 3 after bonding. is required, and is preferably 2 to 20 times the diameter d2 of the ink flow path 4. If d2/d1<2, as shown in FIG. 2(a), the adhesive film 5 may protrude into the ink flow path 4 after adhesion. Furthermore, if the degree of reduction in the diameter of the hole 6 is large, there is a possibility that the hole 6 may protrude into the nozzle 3. As a result, obstructions are created, which adversely affects ink ejection.

On the other hand, if d2/d1>20, FIG.
), even if the adhesive film 5 shrinks after adhesion, a large gap 7 is generated between the nozzle plate and the inkjet recording head substrate, so air bubbles may stagnate in the gap 7 or ink may leak. Sufficient ink ejection cannot be obtained. Further, since the adhesive area is not sufficient, adhesive strength between the nozzle plate 2 and the inkjet recording head substrate 1 cannot be obtained, and there is a possibility that the nozzle plate 2 may peel off.

FIG. 3 is a structural diagram showing a method of bonding the nozzle plate. Figure 3(a) is a plan view, Figure 3(b) is BB
FIG.

In the figure, a gap material 8 embedded in a hole provided in an adhesive film 5 is sandwiched between the nozzle plate 2 and the inkjet recording head substrate 1, and the nozzle plate 2 is bonded to the same. The gap members 8 are arranged symmetrically with respect to the nozzle row.

According to the above structure, by sandwiching the gap material 8 between the inkjet recording head substrate 1 and the nozzle plate 2, when the nozzle plate 2 and the inkjet recording head substrate 1 are bonded, the adhesive film 5 is uniformly coated. When force is applied, the holes 6 in the adhesive film 5 shrink in the same direction, and uniform holes 6 can be formed. Therefore, the load to be applied can be easily managed and manufacturing efficiency is improved. Further, the adhesive film 5 is prevented from protruding into the ink flow path 4, and stable ejection can be ensured. Therefore, the yield can be increased.

The material of the gap member 8 is a metal such as stainless steel, and the shape is a disc. Its diameter is 0.1~3.0
The thickness is about 10 μm to 100 μm, which is thinner than the adhesive film before pressing. If the thickness is large, the amount of collapse after adhesion will be small, which will weaken the adhesive strength of the adhesive film 5, which has a structure in which the adhesive is bonded under pressure. Moreover, if the diameter of the gap material 8 is large, the nozzle plate 2 of the adhesive film 5 and the inkjet recording head substrate 1
The bonding area with the nozzle plate 2 becomes smaller and the bonding strength decreases, causing warping and peeling of the nozzle plate 2, making it impossible to obtain high print quality.

The shape of the gap material 8 is not limited to a disk shape, but may also be, for example, an ellipse, a rod, a rectangle, or the like. Further, regarding the arrangement of the gap materials, there is no problem even if they are not symmetrical with respect to the nozzle rows, but may have a certain configuration with respect to the nozzles, for example, a staggered arrangement with respect to the nozzle rows.

[0024]

Effects of the Invention In the inkjet recording head of the present invention, the inkjet recording head substrate and the nozzle plate are adhered by an adhesive film having holes corresponding to the nozzles and ink flow paths. and does not protrude to the nozzle. Therefore, stable ink ejection can be ensured and high print quality can be ensured.

Furthermore, by sandwiching the gap material embedded in the adhesive film between the nozzle plate and the inkjet recording head substrate and adhering the nozzle plate, when the nozzle plate and the inkjet recording head substrate are adhered, the adhesive film is Force is applied uniformly, and the shrinking direction of the pores in the adhesive film becomes constant, allowing uniform pores to be formed. Therefore, the load to be applied can be easily managed, manufacturing efficiency can be increased, and furthermore, the yield can be increased.

[Brief explanation of drawings]

FIG. 1 is a plan view and an AA cross-sectional view showing the structure of an inkjet recording head showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the structure of a conventional inkjet recording head.

FIG. 3 is a structural diagram showing another embodiment of a nozzle plate bonding method.

FIG. 4 is a structural diagram showing a conventional nozzle plate bonding method.

FIG. 5 is a cross-sectional view showing a conventional method of manufacturing an inkjet recording head.

FIG. 6 is a cross-sectional view showing the structure of a conventional inkjet recording head and a cross-sectional view showing ink ejection.

[Explanation of symbols]

1 Inkjet recording head substrate 2 Nozzle plate 3 Nozzle 4 Ink channel 5 Adhesive film 6 Hole 7 Gap 8 Gap material 9 Adhesive 10 Metal plate 11 Ink

Claims (3)

[Claims] 1. An inkjet in which a nozzle plate is formed with a nozzle for ejecting ink and has a nozzle surface substantially perpendicular to an axis of ink ejection from the nozzle, and is bonded to an inkjet recording head substrate having an ink flow path. An inkjet recording head, wherein the inkjet recording head substrate and the nozzle plate are adhered to each other by an adhesive film in which holes corresponding to the nozzles and the ink flow paths are provided in advance. 2. The hole on the adhesive film is larger in diameter than the nozzle formed in the inkjet recording head substrate, and 2 to 20 times the diameter of the ink flow path. The inkjet recording head according to claim 1. 3. The inkjet recording head according to claim 1, wherein a hole is provided in the adhesive film and a gap material is inserted into the hole to bond the nozzle plate and the inkjet recording head substrate.