JPH08174832A - Inkjet recording head - Google Patents

Abstract

(57) [Summary] [Object] The present invention solves such a problem in the related art by releasing excess adhesive to the outside or generating adhesive when the members are bonded to the substrate with the adhesive. Prevents the adhesive from damaging the ink passages, energy generators, and orifices by preventing gas filling,
An inkjet recording head having a high yield is provided. In order to achieve the above object, the present invention provides an ink jet recording head having a member on which both ends are joined by an adhesive layer and an ink path recess is formed on a substrate, wherein the adhesive is applied to the member. An opening path is formed from the joint portion of the layer with the substrate toward the outside of the substrate, and when the member is joined to the substrate with the adhesive, excess adhesive is released to the outside or the gas generated by the adhesive is filled. Is configured to prevent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet recording head for recording by ejecting liquid to form flying droplets.

[0002]

2. Description of the Related Art In an ink jet recording head, as shown in FIG. 5, an ink is formed by joining a member 1 having a recess for forming an ink path and a substrate 4 having an energy generator 6 for ejecting ink. The passage and the orifice 2 are completed. As shown in FIG. 4, the joining of the member 1 and the substrate 4 is usually performed by a method of attaching an adhesive agent 7 to both ends of the member 1 and joining it to the substrate.
An adhesive reservoir recess 3 is appropriately formed between the adhesive and the orifice as required.

[0003]

In the prior art, even when the concave portion for storing the adhesive is formed, since the excess adhesive is filled in the adhesive reservoir and the excess adhesive does not escape to the outside. , The adhesive flows from a slight gap between the member 1 and the substrate 4 into the ink path or the orifice portion, or is filled with the gas generated in the process of drying and solidifying the adhesive, and likewise flows from the gap to generate energy 6 and ink. Road,
In some cases, the orifice 2 was contaminated. Conventionally, a recording head in which the adhesive has flowed into the ink path or is contaminated with gas in this manner is a defective product because ink is not ejected well, and there is a problem that the head yield deteriorates. there were.

Therefore, in order to solve such a conventional problem, the present invention allows the excess adhesive to escape to the outside or to fill the gas generated by the adhesive when the members are bonded to the substrate with the adhesive. As a result, the adhesive is prevented from damaging the ink passage, the energy generator, and the orifice, and an ink jet recording head having a good yield is provided.

[0005]

In order to achieve the above-mentioned object, the present invention provides an ink jet recording head having a member on which both ends thereof are joined by an adhesive layer and an ink passage recess is formed on a substrate. An opening path is formed in the member from the joint portion with the substrate by the adhesive layer toward the outside of the substrate, and excess adhesive is released to the outside when the member is joined to the substrate with the adhesive or the adhesive. It is configured to prevent the filling of the generated gas. And
The opening path may be formed so as to divide the adhesive layer from the adhesive reservoir concave portion formed inside the adhesive layer toward the outside of the substrate. One or more may be formed. Further, the shape may be any shape.

[0006]

According to the present invention, the opening path is formed in the member in which the ink path concave portion of the ink jet recording head is formed in this way from the joint with the substrate by the adhesive layer toward the outside of the substrate. , When bonding the member on the substrate with the adhesive, excess adhesive escapes to the outside, and the filling of gas generated by the adhesive is prevented, and energy is generated from a slight gap between the member and the substrate. The gas generated when the adhesive or the adhesive dries and solidifies does not flow into the body, ink passages, orifices, etc.
It is possible to prevent the ink passages, the orifices, and the like from being contaminated, the ink can be ejected favorably, and the yield of the recording head can be greatly improved.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing one embodiment of a recording head of the present invention. In the figure, 1 is a member having a concave portion, 2 is an orifice, 3 is a concave portion for storing an adhesive, 4 is a substrate on which an energy generator for ejecting ink is patterned, and 5 is an opening through which excess adhesive and gas are released to the outside. It is a road. Member 1
Considering the cost of the material, the ink resistance, and the ease of grooving, a commonly used resin such as polyether sulfone is suitable. In this example, polyether sulfone was used. The ink path extending to the orifice 2, the adhesive reservoir recess 3 and the opening path 5 were formed by molding the member 1. The substrate 4 was formed by patterning a heating element on a silicon wafer. FIG. 2 is a diagram showing a member and a substrate before being bonded. An adhesive was applied to both ends 7 of the member 1 to bond the member 1 and the substrate 4 together. In the ink jet recording head made in this way, as shown in FIG.
The excess adhesive and the gas generated by the adhesive did not wrap around the nozzle and the orifice portion and were discharged from the opening.

In addition, in the present invention, if the structure for preventing unnecessary adhesive and the gas generated by the adhesive from being released to the outside by preventing damage due to the adhesive filling the ink passage, the energy generator, and the orifice portion, It is not limited to the example. That is, the adhesive reservoir concave portion may not be provided as shown in FIG. 6, and the number of opening paths is plural in FIG. It suffices to have any shape, and the shape of the opening path may be any shape such as a square shape shown in FIG. 7 or the like or an arc shape shown in FIG. As described above, in the present invention, the presence or absence of the adhesive reservoir recess, the location of opening, the number, the shape, etc. are not limited.

[0009]

According to the present invention, an opening path is formed in the member having the ink path recess of the ink jet recording head as described above from the joint portion with the substrate by the adhesive layer toward the outside of the substrate, When the member is bonded to the substrate with the adhesive, the excess adhesive is allowed to escape to the outside or the gas generated by the adhesive is prevented from being filled up. Therefore, energy is generated from a slight gap between the member and the substrate. Generator,
It is possible to prevent contamination of the energy generator, the ink passage, the orifice, etc. by preventing the adhesive or the gas generated when the adhesive dries and solidifies from flowing into the ink passage, the orifice portion, etc. It is possible to perform good ink ejection and significantly improve the yield of the recording head.

[Brief description of drawings]

FIG. 1 is a perspective view showing a recording head of the present invention.

FIG. 2 is a perspective view showing a member and a substrate in which a concave portion for an ink path before joining is formed according to the present invention.

FIG. 3 is a perspective view showing a recording head after joining according to the present invention.

FIG. 4 is a perspective view showing a member and a substrate in which a concave portion for an ink path before joining is formed in a conventional one.

FIG. 5 is a perspective view showing a recording head after joining in a conventional one.

FIG. 6 is a perspective view of an example of the present invention without an adhesive agent reservoir.

FIG. 7 is a perspective view of an example of the present invention having a plurality of openings.

FIG. 8 is a perspective view of an example in which the shape of an opening path of the present invention is different.

[Explanation of symbols]

 1 Member with Ink Channel Recesses Formed 2 Orifice 3 Adhesive Reservoir Recess 4 Substrate 5 Open Path 6 Energy Generator

Front page continued (72) Inventor Yuji Tsuruoka 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (3)

[Claims] 1. An ink jet recording head having a member on which both ends are joined by an adhesive layer and an ink path recess is formed on the substrate, wherein the substrate is joined to the member by the adhesive layer. An opening path is formed toward the outer side of the substrate to allow excess adhesive to escape to the outside or prevent the gas generated by the adhesive from being filled when the member is bonded to the substrate with the adhesive. Inkjet recording head. 2. The opening path is formed so as to divide the adhesive layer from an adhesive reservoir recess formed inside the adhesive layer toward the outside of the substrate. The inkjet recording head according to claim 1. 3. The ink jet recording head according to claim 1, wherein one or a plurality of the opening paths are formed in the member.