JPS6178653A - Joining method of ink jet recording heads - Google Patents

Abstract

PURPOSE:To keep the space between the nozzles in a high accuracy and to improve an operation property by bonding a space keeping member provided between respective recording heads and a substrate provisionally with a bonding agent having a high curing speed, then bonding securely with the bonding agent having a high bonding strength. CONSTITUTION:Two recording head substrates 13 and 23 being made in the same shape are connected together by a spacer 41. The position relation between the substrates of both heads is kept by the spacer 41 having a center portion of thick and accurate length, and being passed through a hole provided to both substrates with the ends thereof being thinned and a fixing ring 43 being putted on a projected section thereof. The surface K is fixed by a normal temperature setting bonding agent having a high curing speed with a mutual position relation of both heads being kept exactly provisionally. Then, surfaces L and M are bonded each other using a powerful bonding agent through it needs more or less time consumption for the bonding. These surfaces are connected strongly with the exfoliation forces being countervailed after the bonding, since the exfoliation directions of the bonding forces are same as the case of the bonding surfaces K and M, on the other hand, that of the surface L is different from them.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an inkjet recording head in an inkjet recording apparatus, and particularly relates to a method for connecting a plurality of ink-on-demand type recording heads.

[Conventional technology]

Inkjet recording devices generally have the advantage of being capable of high-speed printing with low rapid noise, the use of inexpensive plain paper, and the need for complex processing such as the current one, which does not require polishing.

In addition, by reducing the diameter of the dots and shortening the distance between dots, it is possible to record high-resolution images in one image, and it is also effective for recording kanji, figures, colors, etc.

There are various methods for this ink jet printer iC, but as described in Japanese Patent Publication No. 53-12138, in response to an electrical signal for printing, the abrasive pulse is activated by an electromechanical converter such as a piezo in the recording head. The so-called on-demand method, in which a small amount of ink is ejected from a small suction nozzle applied to the element, is used for recording. Rude things,
It is used as a powerful method for small-sized discharge price VCJ.

However, if the number of cycles of one pulse is increased in order to increase the recording speed of this Vi special VC, due to the viscosity of the ink that is ejected in response to the mechanical conversion element, it becomes difficult to eject the ink correctly. There is a limit to the speed of reaction. Therefore, in order to increase the recording speed from the one having one nozzle in one six-door head, a recording head mounting one recording head VC Tawarakko nozzle was devised, and it was published in Japanese Patent Application Laid-Open No. 51-35231. recorded. The nozzles are arranged in this Kirin head, and due to certain restrictions the distance between the nozzles is 0.2
It is difficult to make it smaller than mm. In order to solve this problem, a multi-nozzle recording head has been developed in which several nozzles are mounted in two rows in a staggered manner, and it is now possible to produce high-resolution images of up to eight images in one image.

In addition, in 4 of the a + 74 notes, there is a need to record dots from the m nozzle to the nozzle or higher in order to obtain print quality that is close to that of the typeface, and for this reason it is necessary to reduce the distance between the nozzles. Nozzle distance 4: 0.05 to 0.15
It is extremely difficult to make it into mm.

For this reason, a method of connecting a plurality of heads into a single head is being used.

? Figure s4 is a perspective view showing an example of a ligature in an inkjet recording head, and Figure 5 is a front view of the inkjet recording head as seen from the nozzle surface side. 10.20 recording heads having almost the same shape and function, each having a central substrate 13, and substrates 12 bonded to both sides of which at least the portion corresponding to the pressurizing chamber VC is usable. The base body is composed of people 12B, 22C, and 22D.

In addition, the above-mentioned contact surfaces are A side, B side, 0 side, D side from the left side in the figure.
Hereinafter referred to as the surface. Here 14A, 14B, 24C124
Each of DFi is a plurality of nozzle rows formed on the A side, Brki, 0 side, and D side of the bonding surface. Ink supply paths including nozzles are connected to substrates 12A, 12B, 22C.

It may be formed on the side surface of the substrate 13 instead of on the inside side of 22D.
D both upper ue group rm 12 A, 12B, 22C
122D is a pressure ζ variable element with an array and receiving layer on the surface.

Openings 15A, 15B, δC, and 25D are provided at predetermined positions of Test 1i12A, 12B, 22C, and nD, and the contact pieces [l1iA: complete, corresponding to the openings on the B side, 0th side, and the D side] Parts are falling off. Also, the substrate 13.2
A small hole is made in the center of the road portion of No. 3. 31 is a columnar spacer as a connecting part forest having a stepped part to abut on the 4 protruding parts of the B side and the 0 side to keep the joint surface at a constant +iil tooth, and 3 to 41 A solid is suitable for stability. Machine screws are formed at both ends of the spacer 31A, and can be tightened with nuts 32. That is,
Pass the modified spacer 31 through the recording head 10 and the small hole of the addition so that its stepped part comes into contact with the protruding part of the cutting surfaces B and 0, and tighten with the nut 32. and the 0 plane is held at a constant t+'l.

Also, 31B is a spacer; 1% spacer is a spacer that is joined using adhesive, which is different from the connection method of 31 people. 31
B-circle and 0-side are made to have a certain thickness, and both ends are closely attached to the above-mentioned repair defects on the B-side and 0-side of the bonding surface by exploding dust and fixing with adhesive). 7. The adhesive used is a low-strength epoxy/housing adhesive or the like. In order to inject the adhesive, at least one narrow groove in the shape of a flat 1jIVC slit is provided in the part fixed to the B side and 0% of the spacer 31B, that is, in the opening protrusion part of the joint surface. 3
1 A trowel with B in contact with the bulging part, the thin III#
By injecting adhesive into the space? The contact layer becomes more reliable as the stimulant enters the inside of the abutting reference surface of 31B by capillary action in the trench.

Q. Length of stepped portion of 31 spacers or 31 spacers
The total length of B is determined by one of each nozzle row 14A, 14B, 24C, 24D so that the dot spacing on the recording paper is even -VC'fx.
The tjl interval is determined to be an integral multiple of the dot interval.

A plurality of recording heads have been bonded together using the various methods described above, but these have been achieved by bonding a plurality of recording heads using a gamma stone agent.
Even with the fastening method, the screw tightening torque is greater than the Kuramaro strength, and the head position is not correct? As a result, the head moves due to the torque of the screw stopper, making it difficult to maintain the correct position. Also, connect both ends of the spacer to the B side of the joint surface? Also, the method of fixing only with adhesive to the curvature of the C side does not cause leprosy or 4i, and also has drawbacks such as easy alignment and poor marking.

[Purpose of the invention]

The present invention eliminates the above-mentioned drawbacks when combining four heads of α, maintains the nozzle aperture distance between the recording heads, and reduces the impact caused by temperature changes. I'll not cause any deviation: Easy scum diagnosis + step yc
Therefore, it is classified as something whose purpose is to combine. This LV
High-resolution iiehen printing with superior printing quality than C, high-speed recording,
Furthermore, it is an object of the present invention to provide a recording head-to-print head coupling method that achieves color recording.

[Structure of the invention]

$: Invention When combining and integrating several recording heads,
Use the substrate surface of one recording head as a base layer and use spacers etc. between the other recording heads]! As a method of connecting the heads while maintaining the head spacing using a connecting phase, one contact surface between the spacer, which is a connecting Flj member, and the substrate is temporarily connected with instant adhesive, etc., and the positional accuracy is fixed with 1i11 accuracy. , then fix the other contact surfaces in earnest with adhesive. This J! 1. A recording head coupling method based on the principle that one contact surface of the sweet slider and the substrate and another contact surface are strongly fixed by different directions of shearing or peeling compared to adhesion. be. In addition, as a preferred implementation method, after screwing one substrate of the recording head and the spacer, fixing the other substrate and the spacer using the adhesive method described above, it is also possible to disassemble the Vitt. This is a recording head coupling method.

[Implementation row]

FIG. 1 is a diagram in which recording heads are connected by the method of the present invention;
In Figure 2, some parts are connected with screws. In the following figures, the same components as in FIGS. 1 and 2 are given the same reference numbers. First, the connection of two recording heads in a row will be explained. The figure shows the substrate 13 of two recording heads manufactured in the same shape and the spacer 41 which is a member connecting the recording heads.
However, this spacer 41 also serves as a spacing maintenance member for maintaining accurate positional relationship between the image recording heads, and as shown in FIG. 1, this spacer 41V1
As a stepped part, the center is thick and the length of this part is made precise to maintain the relationship between the board spacing between both heads, and both ends are made thinner and holes are drilled through both boards for this part to pass through. It has a structure in which a fixing ring 43 is fitted into the protruding portion and fixed.

When the image recording head is bonded with an adhesive in this way, the contact surface is used to bond each substrate 13, 23 and the connecting member 41 to each other. Glue 1! It is a contact surface.

It is also the contact surface between the inner wall of the hole of the La fixing ring 43 and the thin part of the spacer 41, which is a connecting member that passes through the hole.

First, while keeping the mutual positional relationship of both heads accurate, the surfaces are temporarily fixed with adhesive. This adhesive is a room-temperature curing adhesive that cures quickly, generally an adhesive between the legs. Glue everything together using a very strong adhesive. Although the peeling direction of the contact layer on the bonded surface after adhesion and the M side is the same, on the other hand, since the upper direction of the L side is different, the peeling forces cancel each other out and a strong [removal] occurs.

Another method, as shown in Figure 2, is to remove one end of the thin part of the spacer, which is a connecting member, so that it can be screwed in place, and then create a female screw hole in which the set screw 53 can be inserted and fastened by sandwiching the board. Use the spacer 51.

First, fix the temporary part 3 and the spacer 51 with the screws 53. Next, while maintaining the mutual positional relationship of both heads accurately, temporarily bond the surfaces of the board and the spacer 51 with adhesive, and then attach the fixing ring 53. For convenience, this method involves bonding the back side and the M side with a strong adhesive. After bonding, it is possible to separate the two recording heads from each board for some reason such as repairing the heads, making it possible to create a single recording head. It is also possible to store and handle it alone.

Still another method is to remove the thin parts at both ends of the spacer, which is a connecting member, as shown in FIG. 3, and use a spacer 61 with screw holes to fix and connect both plates with screws 63 as described above. First, the substrate 13, B, and the spacer 61 are temporarily bonded to their contact surfaces and the K surface with an adhesive while maintaining the mutual positional relationship of the substrates accurately, and then the spacer 61 is attached.
Fix the screw hole drawing with adhesive. In this case screw 63
Vi It is not necessary to tighten the screws so strongly.In this method, the adhesive is applied to the threaded part of the screw 63, so that the adhesive strength is improved and it is smooth. 61 long? ll
The I degree provides accuracy, but the shape can be simple for agricultural purposes, and has the advantage of being low-cost.

As for the material of the spacer, which is a connecting member used in the above method, stainless steel or the like can be used, but glass, ceramic, etc., which have a small coefficient of thermal expansion and good bonding properties, are preferable.
Great? It is desirable to cut grooves such as screws into the thin parts 41 and 51 so that the adhesive penetrates into the details, and process them so that they tightly adhere to the fixing ring 42.The usual epoxy/string dust layer agent is completely cured. Since bonding VC requires a long time on the rudder, such as a whole day and night, as mentioned above, temporary bonding is performed using one-way adhesive cutting, which improves the YF-SL properties and makes it possible to manufacture at a low cost. .

〔Effect of the invention〕

As described above, the recording head coupling method according to the present invention allows the nozzle spacing of the Eno α row consisting of i number of recording heads to be easily controlled with high accuracy, resulting in a high resolution [8! It is possible to manufacture a recording head that is capable of recording If and color 11-elephant recording at high speed and forming images with accurate dots, and the nozzle spacing of the recording head is always stable, with little influence from changes in the external environment. The built-in precision can be maintained. Further, the joining method of the present invention can provide a recording head joining method that can be easily assembled, is inexpensive, and has excellent workability.

[Brief explanation of the drawing]

Fig. 1 is a basic diagram of the case where recording heads are combined according to the present invention, Fig. 2 is a diagram of a case in which the recording heads are partly connected by screwing,
FIG. 3 shows a case where all the recording heads are connected by screws J. FIG. 4 is a diagram of m-1 of the hole for connecting the recording head by the conventional method.
31 B, 41, 51, 61... Connecting member spacer: 32, 43, 53... Fixed member, LLM, J... Adhesive surface 53, 62, 63...・Mounting screw agent Patent attorney No 1) Parent-in-law Figure 1

Claims (3)

[Claims] (1) In a recording head combination method for combining and integrating a plurality of recording heads for an inkjet recording device,
A spacing member is disposed between the substrates of each recording head, and the spacing member and the substrate are first temporarily bonded using an adhesive with a fast curing speed, and then fixedly bonded using an adhesive with high adhesive strength. A method for joining an inkjet recording head, characterized in that: (2) Among the locations where the substrate of the recording head and the spacing member are bonded, at least one location is bonded with the adhesive, and at least one other location is bonded with a screw. 2. A method for joining an inkjet recording head according to item 1. (3) The inkjet according to claim 1 or 2, wherein the bonding surfaces of the substrate and the spacing member are at least two surfaces with different shearing or peeling directions with respect to adhesion. How to combine recording heads.