JPS6183045A - On-demand inkjet 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 The present invention relates to an on-demand inkjet head used in facsimiles, X-Y plotters, copying machines, and the like.

Figure 6 is a cross-sectional configuration diagram showing an example of a conventional on-demand inkjet head. In the figure, 1 is a nozzle, 2 is an electromechanical transducer, 3 is a long plate, and 4 is a connecting member. , 5 is a flow path substrate, 6 is a liquid flow path, 7 is an ink pressurizing liquid chamber, 8 is an ink supply side flow path, 9 is an ink supply tube, 10 is a vibration substrate, 11 is a thin plate member, 12 is a support body, 13 is a vibration unit consisting of an electromechanical transducer 2 and a long plate 3;
Regarding the Inkje 7 tohenodo shown in the figure,
It is described in detail in Japanese Patent No. 8-16857. In the inkjet head shown in FIG. 6, the thin plate member 11 is displaced by the vibration unit 13 to pressurize the ink in the ink pressurized liquid chamber 7 and eject ink droplets from the nozzle 1. Since the displacement direction of the thin plate member 11 and the jetting direction of ink droplets are perpendicular to each other, when a multi-nozzle is used, the distance from the thin plate member 11 to the nozzle 1 is long, resulting in poor jetting efficiency and miniaturization. There was a limit.

FIG. 7 is a side sectional view showing an example of an on-demand inkjet head that eliminates the drawbacks of the above-mentioned conventional technology. Reference numbers are attached. Thus, in the inkjet head shown in FIG.
1 to the nozzle 1, the ink jet head has better ink droplet jetting efficiency than the inkjet head shown in FIG. 6, and is advantageous for downsizing. Difficulties in joining during assembly, such as joint strength,
There were problems with positional accuracy, etc., and the yield was poor.

The present invention was made in order to solve the above-mentioned drawbacks of the prior art, and particularly provides an on-demand inkjet head that has a simple structure and is easy to assemble compared to the above-mentioned conventional heads. It was done for that purpose.

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention has a flow path substrate having a nozzle in the thickness direction, and a vibrating substrate having a thin plate facing the nozzle, and the flow path substrate and the vibrating substrate cause liquid A head body forming a flow path, a vibration unit having an elongated electromechanical transducer and displaceable in a direction perpendicular to the longitudinal direction of the vibration unit, and a support for fixing one end of the vibration unit to the head body. A body portion, a connecting body portion for transmitting vibration of a free end portion of the vibrating unit to the thin plate, and the supporting body portion and the connecting body portion are integrally connected along the longitudinal direction of the vibrating unit. The device is characterized by having a connecting body portion. Hereinafter, the present invention will be explained based on examples.

FIG. 1 is a configuration diagram of the main parts for explaining one embodiment of the present invention, (A> figure shows a sectional view of the main parts, and FIG. 1B shows a perspective view of the main parts. Hereinafter, FIGS. 7 have the same reference numerals as in FIGS. 6 and 7. Accordingly, in the present invention, one end of the vibration unit 13 is connected to the head body. (Vibration board) A supporting body 12 for fixing to the vibration unit 10 and a connecting member 4 for transmitting the vibration of the other end (free end) of the vibration unit 13 to the thin plate member 11 are integrally formed. 1, 20 indicates a member in which the support body 12 and the connecting member 4 are integrally formed.As shown in the figure, this member 20 includes a support body portion 21 for fixing one end of the vibration unit 13 to the head body. , a connecting body part 23 for transmitting the vibration of the free end of the vibration unit to the thin plate member, and a connection for connecting the supporting body part 21 and the connecting body part 23 in the longitudinal direction (direction of the arrow) of the vibration unit. The members 22 are integrally formed by, for example, resin molding.In addition, in FIG. Although the example is shown, the width of the member 20 is the width of the vibration unit 1
It does not depend on the width of 3, and can be made as thin as the strength allows.

FIG. 2 is a side sectional view showing a modified example of the thin plate part 1.
1 may be formed integrally with the vibration substrate using resin, for example, but as shown in FIG. 2, it may also be formed separately from the vibration substrate using a resin film, a thin metal plate 30, or the like. good.

FIG. 3 is a diagram showing a modified example of the member 20, in which (A) is a side sectional view and (B) is a perspective view. In this embodiment, the member 20 faces the vibration unit. That is, the surface of the connecting body portion 22 is space 2 relative to the vibration unit.
5, thereby preventing the vibration unit from being affected by the rigidity of the connecting body portion 22, thereby effectively transmitting the vibration of the vibration unit to the thin plate member.

FIG. 4 shows the case where the member 20 is applied to a multi-nozzle head, where (A) is a plan view and (B) is a perspective view. It is sufficient to integrally form a predetermined number of members 20 as shown in FIG.
Easier handling and positioning accuracy during assembly.

FIG. 5 is a diagram showing a modification example in which the thin plate member 11 and the vibrating substrate 1O are provided separately as shown in FIG.
Figure A) is a side sectional view, Figure (B) is a perspective view, in this case,
The member 20 integrally formed as described above can be further integrally formed with the vibrating substrate 10 using resin or the like.

Note that, although an example has been shown above in which the electromechanical transducer 2 and the elongated plate member 3 acting as elasticity are integrally joined as the vibration unit 13, this is not limited to the example shown. Instead, it is easily understood that, for example, a bimorph type electromechanical transducer in which one electromechanical transducer is further arranged may be used.

Results As is clear from the above description, according to the present invention, handling and positional accuracy management when joining the vibration unit and the thin plate are easier than when the connecting member is composed of a single unit. Furthermore, since the length between the support base and the connecting member is determined at the time of molding without depending on assembly, variations in the effective length of the vibration unit can be suppressed. Further, since the number of parts is reduced, processing costs and assembly costs are reduced.

[Brief explanation of the drawing]

FIGS. 1 to 5 are block diagrams for explaining the present invention in detail, and FIGS. 6 and 7 are block diagrams for explaining an example of a conventional on-demand inkjet head. 1... Nozzle, 2... Electromechanical conversion element, 3...
Long slope, 4... Connecting member, 5... Channel board, 6...
...Liquid flow path. 7... Ink pressurized liquid chamber, 8... Ink supply side channel,
9... Ink supply pipe, lo... Vibration board, 11
...Thin plate member, 12... Support body, 13... Vibration unit. 21... Support body part, 22... Connection body part, 23...
Connecting body portion, 30... thin plate. ; Happy 1 Figure (A) (B) 2nd year of high school Figure 3 Figure 4 (A) (B) Figure 5
Figure 1981 Patent Application No. 205784 3, Address of the person making the amendment: 1-3-6 Nakamagome, Ota-ku, Tokyo Representative
Hama 1) Hiro 7, Contents of amendment (1), “No. 6 @ is” stated in the first line of page 3 of the specification.
is corrected to ``Figure 7 is''. (2), “Fig. 7 is” written in the 19th line of the same
The figure has been corrected to ``. (3), page 4, lines 1, 2, and 6, “6th
"Fig. 7" is corrected to "Fig. 7". (4) ``Figures 6 and 7 J written in lines 14 and 15 of page 5 and line 2 of page 9 are corrected to ``Figures 7 and 8.'' (5) Add the following sentence between the second and third lines of page 8. 6 is a perspective view showing another embodiment of the present invention, in which a long plate 3 is connected to a support 21 and a connecting member 23.
The electromechanical transducer element 2 is bonded to the elongated temporary 3. This integrally molded vibrating member 12 can be easily processed, for example, by resin molding. Further, the vibrating member may be formed by processing with glass, ceramic, or the like, or processing with metal, and the processing method may be, in addition to molding, etching, machining, etc. ” (6), “Figures 1 to 5 are” in the first line of page 9 is corrected to “Figures 1 to 6 are j.” (7), Figure 6 and Figure 7 as attached, Figures 6 and 7.
Figure 8 is corrected.

Claims (4)

[Claims] (1) A head body having a flow path substrate having a nozzle in the thickness direction, a vibrating substrate having a thin plate facing the nozzle, and forming a liquid flow path by the flow path substrate and the vibrating substrate; a vibration unit having a shaped plate material and an elongated electromechanical transducer element, and configured to be displaced in a direction perpendicular to the longitudinal direction of the vibration unit; a support portion fixing one end of the vibration unit to the head main body; It has a connecting body part for transmitting the vibration of the free end of the unit to the thin plate, and a connecting body part that integrally connects the supporting body part and the connecting body part along the longitudinal direction of the vibration unit. An on-demand inkjet head characterized by: (2) On a surface where the connecting body part faces the vibration unit, the connecting body part is configured in a shape such that it continuously comes into close contact with the vibration unit from the connecting body part to the support body part. Claim No. 1 characterized in that
) The on-demand inkjet head described in item 1. (3) A patent characterized in that the connection part is configured to have a non-contact surface at least in part between the connection part and the vibration unit on a surface facing the vibration unit. An on-demand inkjet head according to claim (1). (4) According to claim (1), wherein the integrally formed support part, connecting body part, and connecting body part are integrally formed with the vibration unit. on-demand inkjet head.