JP2002273877A - Ink jet printing head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control a thickness of an adhesive layer between a pressure generation mechanism support substrate and a head case primarily in relation to an ink jet printing head. SOLUTION: A rectangular space is set between the pressure generation mechanism support substrate and the head case. A wedge-shaped adhesion auxiliary part is inserted to the space. The thickness of the adhesive layer can be easily controlled by adjusting a level of the insertion of the wedge-shaped adhesion auxiliary part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a print head mainly using an ink jet system.

[0002]

2. Description of the Related Art FIG. 2 is a sectional view showing the structure of a conventional ink jet print head.

In FIG. 2, reference numeral 1 denotes an orifice plate provided with ink discharge holes 2; 3 denotes an ink pressurizing chamber; 4 denotes a restrictor for guiding ink from a common ink reservoir 5 to the ink pressurizing chamber 3; A vibrating membrane plate for transmitting a pressure wave generated from the mechanism 7 to the ink pressurizing chamber 3, a pressure generating mechanism supporting substrate 8 for supporting the pressure generating mechanism, and a head case 9 are provided. The pressure generating mechanism 7 and the pressure generating mechanism supporting substrate 8 are joined to the vibrating membrane plate 6 with an adhesive 10 and the adhesive 1
At 2 it is fixed to the head case 9.

[0004] Ink supplied from an ink supply port (not shown) fills the common ink reservoir 5 and fills the ink pressurizing chamber 3 via the restrictor 4. When an electric pulse is applied to the pressure generating mechanism 7, a pressure wave propagates to the ink pressurizing chamber 3, and the ink wave is ejected from the ink ejection hole 2 toward a recording medium (not shown) by the pressure wave.

[0005]

In the above-mentioned conventional structure, at least two surfaces, that is, the surface for bonding the pressure generating mechanism 7 to the diaphragm plate 6 and the surface for bonding the pressure generating mechanism supporting substrate 8 to the head case 9 are provided. Need to glue. Therefore,
After the pressure generating mechanism 7 and the diaphragm plate 6 are bonded with the adhesive 10, the pressure generating mechanism support substrate 8 and the head case 9 are bonded with the adhesive 12. So, adhesive 1
2 is to apply beforehand before bonding the pressure generating mechanism 7 and the vibrating membrane plate 6 or to flow between the pressure generating mechanism supporting substrate 8 and the head case 9 after bonding the pressure generating mechanism 7 and the vibrating membrane plate 6. Glued by However, it is very difficult to control the thickness of the adhesive 10 and the adhesive 12 in the above-described steps.

For example, if the thickness of the adhesive 10 is too large,
The pressure wave generated from the pressure generating mechanism 7 is absorbed by the adhesive, and causes a drop in the ink droplet ejection speed. Also,
If the thickness of the adhesive 10 differs depending on the print head,
This may cause variations in the ink droplet ejection speed. On the other hand, if the thickness of the adhesive 12 is too large, the fixing between the pressure generating mechanism support substrate 8 and the head case 9 becomes insufficient, and the pressure waves generated from the pressure generating mechanism 7 are efficiently transmitted to the diaphragm plate 6. Cannot be performed, which causes a drop in the ink droplet discharge speed. Conversely, if the thickness of the adhesives 10 and 12 is small, the adhesive strength will be reduced.

[0007] For the above reasons, it is necessary to control the thickness of the adhesives 10 and 12 so as to maintain a sufficient adhesive strength and not to impair the transmission efficiency of the pressure wave.

The thickness of the adhesive 12 is also affected by the dimensional accuracy and relative positional accuracy of the pressure generating mechanism support substrate 8 and the head case 9. If the dimensions and relative positions of the pressure generating mechanism support substrate 8 and the head case 9 are shifted in a direction to increase the distance between them,
Naturally, the thickness of the adhesive 12 increases. Further, the shape accuracy of the pressure generating mechanism support substrate 8 and the head case 9 also has an effect.
When the bonding surfaces of both the pressure generating mechanism supporting substrate 8 and the head case 9 are not parallel to each other, the pressure generating mechanism supporting substrate 8 is not perpendicular to the diaphragm plate 6 and the pressure wave generated by the pressure generating mechanism 7 The transmission efficiency to the diaphragm plate 6 is reduced. As described above, in order to control the thickness of the adhesive 12, it is necessary to maintain the dimensions, relative positions, and shapes of the pressure generating mechanism support substrate 8 and the head case 9 with high precision, which is technically very difficult.

The present invention solves the above-mentioned problems, and an object of the present invention is to provide a print head capable of controlling the thickness of an adhesive.

[0010]

According to the present invention, there is provided an ink pressurizing chamber, an ink discharge hole communicating with the ink pressurizing chamber, and an ink filling the ink pressurizing chamber. A pressure generating mechanism for applying pressure to discharge ink droplets from the ink discharge holes, and an ink jet formed by bonding and fixing a pressure generating mechanism and a vibrating membrane plate, and a pressure generating mechanism supporting substrate supporting the pressure generating mechanism and a head case; In the print head, a wedge-shaped bonding auxiliary component is arranged between the pressure generating mechanism support substrate and the head case, and the thickness of the bonding layer at the time of bonding can be controlled by changing the insertion amount of the bonding auxiliary component.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One example of the present invention will be described with reference to FIG.

FIG. 1 is a sectional view showing the structure of a head portion of an ink jet printing apparatus as an example of the present invention. The same parts as those in FIG. 2 are denoted by the same reference numerals.

In FIG. 1, a substantially triangular space is formed in at least one of the head case 9 and the pressure generating mechanism support substrate 8.

When bonding is performed with this ink jet head, first, the vibrating membrane plate 6 and the pressure generating mechanism 7 are bonded via an adhesive 10. Since the bonding at this time is bonding on only one surface, the thickness of the adhesive 10 can be controlled by adjusting the bonding pressure applied to the pressure generating mechanism 7 and the pressure generating mechanism supporting substrate 8. Next, the wedge-shaped bonding auxiliary component 13 is coated with the adhesives 11 and 12 and inserted into the triangular space. One surface of the wedge-shaped adhesive auxiliary component 13 is parallel to one surface forming the triangular space of the head case 9, and the other surface forms the triangular space of the pressure generating mechanism support substrate 8. Is parallel to

Since the thickness of the adhesive 12 at the time of bonding is determined by the degree of insertion of the wedge-shaped bonding auxiliary component 13, it is not necessary to maintain the relative position between the pressure generating mechanism support substrate 8 and the head case 9 with high precision. That is, the thickness of the adhesive 12 can be controlled by adjusting the insertion amount of the wedge-shaped bonding auxiliary component 13.

When inserting the wedge-shaped bonding auxiliary component 13, the bonding jig 14 is inserted between the head case 9 and the surface of the pressure generating mechanism support board 8 opposite to the surface bonded to the wedge-shaped bonding auxiliary component 13. By sandwiching, the pressure generating mechanism supporting substrate 8 can be adhered without tilting.

[0017]

As described above, according to the present invention, it is possible to control the thickness of the adhesive layer between the support substrate for the pressure generating mechanism and the head case, and to manufacture a print head without variation in individual characteristics. Is possible.

[Brief description of the drawings]

FIG. 1 is a sectional view showing the configuration of an ink jet head according to the present invention.

FIG. 2 is a configuration sectional view of a conventional inkjet head.

[Explanation of symbols]

1 is an orifice plate, 2 is an ink ejection hole, 3 is an ink pressurizing chamber, 4 is a restrictor, 5 is a common ink reservoir,
6 is a vibrating membrane plate, 7 is a pressure generating mechanism, 8 is a pressure generating mechanism support substrate, 9 is a head case, 10, 11, and 12.
Denotes an adhesive, 13 denotes a wedge-shaped bonding auxiliary part, and 14 denotes a bonding jig.

Claims (1)

[Claims] An ink pressurizing chamber, an ink discharge port communicating with the ink pressurizing chamber, and a pressure generating mechanism for applying pressure to ink filling the ink pressurizing chamber and discharging the ink as ink droplets from the ink discharge port. In an ink jet print head comprising a pressure generating mechanism and a vibrating membrane plate, and a pressure generating mechanism supporting substrate supporting the pressure generating mechanism and a head case being bonded and fixed, a wedge-shaped structure is formed between the pressure generating mechanism supporting substrate and the head case. An ink jet print head, wherein a thickness of an adhesive layer at the time of bonding is controlled by arranging a bonding auxiliary component and changing an insertion amount of the bonding auxiliary component.