JPS6311355A - Ink jet recording apparatus - Google Patents

Abstract

PURPOSE:To eliminate deterioration with the elapse of time and to reduce manufacturing cost, by constituting a recording head part of a substrate having a heat generator, an emitting orifice plate having emitting orifices formed thereto and a fixing member pressing a plurality of minute parts of the emitting orifice plate to fix the emitting orifice plate to the substrate. CONSTITUTION:A substrate 14 has a recording liquid supply hole 21 provided to the center thereof and is bonded to a mount stand 13, and a gap plate 15 and an emitting orifice plate 16 are fixed to the substrate 14. The recording liquid supplied from a recording liquid supply pipe 12 passes through the recording liquid supply hole 21 to be supplied to the gap between the substrate 14 and the emitting orifice plate 16. Power is intermittently supplied to a heat generator 20 and the recording liquid generates abrupt film boiling to emit recording liquid droplets from emitting orifices 22. An emitting orifice plate pressing plate 17 is a leaf spring and bent so as to press the emitting orifice plate by a plurality of minute parts and a top plate 18 is fixed to the mount stand 13 by screws 23. It is unnecessary to use an adhesive in the assembling of a recording head and assembling can be performed within a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an inkjet (hereinafter referred to as a thermal inkjet) that ejects recording liquid droplets by changing the heating state of recording liquid.

) Regarding an inkjet recording device used for recording.

[Prior art] As a conventional example of a thermal inkjet recording device, HKW in the United States
LEiTT-PAOKARD Journal 1985 5
The structure of the recording device and recording head is introduced in detail in the monthly issue, and is an effective means for realizing an inkjet recording device that has a simple structure and is capable of high-speed, high-density recording.

[Problem that the invention seeks to solve]

However, the thermal inkjet recording device introduced in the above literature uses an adhesive to bond the head substrate and the ejection port plate, and the adhesive may deteriorate due to contact with the recording liquid. Deterioration over time, such as a decrease in adhesive strength, cannot be avoided, and the use of adhesives in the manufacturing process has problems, such as prolonging the manufacturing time and reducing the manufacturing yield.

The present invention is intended to solve these problems, and its purpose is to provide an inkjet recording device that does not deteriorate over time and is inexpensive to manufacture.

[Means to solve the problem]

The inkjet recording apparatus of the present invention includes a substrate in which a recording head section forms a heating element, an ejection port plate in which ejection ports are formed,
It is characterized by comprising a fixing member that presses a plurality of minute parts of the discharge port plate and fixes the discharge port plate to the substrate.

〔Example〕

The present invention will be explained in detail based on examples.

FIG. 1 is a schematic overall configuration diagram showing an embodiment of an inkjet recording apparatus of the present invention.

In FIG. 1, the recording head 1 is guided by a carriage guide 6 and moves in the direction of the arrow while being supplied with recording liquid from a recording liquid tank 5 through a recording liquid supply pipe 12. Inkjet recording is performed on a recording paper 3 that is fed intermittently with a line feed synchronized with 1. Note that 9 is the paper feed motor;
is the paper feed gear, 11 is the ° carriage motor, 12 is the carikke belt, and 7 is the frame of the device.

FIG. 2 is a schematic exploded view showing the structure of the recording head 1 of the inkjet recording apparatus of the present invention, and FIG.
FIG. 2 is a cross-sectional view of the recording head 1 shown in the figure.

The operation of each part will be briefly explained with reference to FIGS. 2 and 6. In FIG. 2, a substrate 14 has a recording liquid supply hole 21 in the center and is joined to a mounting base 13, and a gap plate 15 and a discharge port plate 16 are fixed on the substrate 14. The recording liquid supplied from the recording liquid supply pipe 12 in FIG. 3 passes through the recording liquid supply hole 21 and is supplied to the gap between the substrate 14 and the nozzle plate 16. Electric power is intermittently supplied to the heating element 20 through the electrode 19 to generate Joule heat, and the recording liquid in contact with the surface of the heating element 20 undergoes rapid film boiling, causing a pressure change that causes the recording liquid to be discharged from the discharge port 22. The droplet 24 is what is ejected. The discharge port temporary holding plate 17 is a plate spring that is bent so as to press the discharge port plate 16 at a plurality of minute parts, and by fixing the top plate 18 to the mounting base 13 to which the board 14 is joined with screws 23, Substrate 14. Gear knob plate 15. The discharge outlet plate 16 is held and fixed by the discharge outlet temporary holding plate 17.

According to the above configuration, there is no need to use adhesive to assemble the recording head 10, and the assembly can be performed in a short time. Furthermore, by pressing the discharge port plate 16 with a plurality of small parts, it is possible to fix the discharge port plate 16 without applying excessive stress to the discharge port plate 16. That is, if the member that presses the ejection port plate 16 is a wide flat surface, the ejection port plate 16 will warp unless a force is applied in a direction exactly perpendicular to the flat surface, causing the recording liquid to be ejected and the ejection ports to be distorted. It is extremely difficult to fix the ejection port plate 16 without warping or the like because it has an adverse effect on the supply of recording liquid to the ejection port plate 20, and the unevenness of the plane surface also exerts a force that bends the ejection port plate 16. .

The fixing member that presses the ejection port plate 16 must be between the ejection port plate 16 and the recording paper 30, so it is desirable that it be thin.
If a plate spring is used as in the embodiment shown in FIGS. The ejection port temporary holding plate 17 is desirably made of a material that is not corroded by the recording liquid, such as a thin plate of stainless steel.

FIG. 4 is a cross-sectional view for explaining the force acting on the discharge port plate 16 of the discharge port temporary holding plate 17 of the embodiment shown in FIG.
FIG. 5 and FIG. 6 show a discharge port temporary holding plate 1 in another embodiment.
7 is a cross-sectional view for explaining the force acting on the discharge port 16 of FIG. Fig. 4, Fig. 5, and Fig. 6 show the discharge port temporary holding plate 1.
The component perpendicular to the plane of the discharge port plate at the point of application of the force acting on the discharge port plate 16 in No. 7 is Pl, and the horizontal component is 11F2.
Indicated by

The structure of the discharge 0 presser plate 17 shown in FIG.
It is possible to suppress the portion near the discharge port 20 of the device, which is extremely preferable in terms of structure. However, since the acting force F2 due to the rubbing force between the surface of the discharge port plate 160 and the portion of the discharge port temporary holding plate 17 that is in contact with the discharge port plate 16 compresses the discharge date plate 16, the discharge port plate 16 Depending on the strength and magnitude of frictional force, warping may occur in the discharge port plate 16 during assembly or as a result of deterioration over time.

The embodiments shown in FIGS. 5 and 6 solve this problem, and in the structure shown in FIG. 5, the force 'I!' acting on the discharge port plate 16 due to friction is 2 acts in the direction of pulling the discharge port plate 16, and even when the strength of the discharge port plate 160 is low, there is no possibility of warping of the discharge port plate 16.

Further, the structure shown in FIG. 6 is more suitable because only the force F1 that presses it perpendicularly to the discharge date plate 16 acts.

〔Effect of the invention〕

As described above, according to the inkjet recording apparatus of the present invention, the manufacturing of the recording head is easy and the quality is stable, and
An inkjet recording device that does not deteriorate over time can be manufactured.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the general structure of an inkjet recording apparatus according to the present invention. FIG. 2 is a schematic exploded view showing the configuration of the recording head of the inkjet recording apparatus of the present invention. FIG. 3 is a sectional view of the recording head shown in FIG. 2. FIG. 4 is a sectional view showing the action of the ejection port temporary holding plate of the recording head shown in FIG. 2. Figures 5 and 6
The figure is a cross-sectional view showing the function of a temporary holding plate for a discharge port in another embodiment of the present invention. that's all

Claims (2)

[Claims] (1) In an inkjet recording device that ejects recording droplets from a recording liquid ejection port by changing the heating state of the recording liquid and performs recording on a recording paper facing the recording liquid ejection port, the print head portion forms a heating element. An inkjet recording apparatus comprising: a substrate, an ejection port plate having ejection ports formed thereon, and a fixing member that presses a plurality of minute parts of the ejection port plate to fix the ejection port plate to the substrate. (2) The inkjet recording apparatus according to claim 1, wherein the fixing member is a leaf spring.