JPH10202880A - Inkjet head - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To enable mass production of an ink jet drop generator, thereby reducing costs. A groove (5) forms a liquid (ink) flow path and a discharge port (4) by joining a lid substrate (1) and a substrate (2), and a region (6) is a recording liquid (ink) introduced from an inflow port (3). To form a room for accommodating. Conventionally, the lid substrate (discharge port to flow path to liquid chamber portion) is formed by forming a partition wall portion of a groove and then joining a cover (Japanese Patent Laid-Open No. 55-109670) or complicated (many steps). ) Although it was formed by using a photolithography process (Japanese Patent Application Laid-Open No. 56-123869), in the present invention, it is manufactured by, for example, integral molding of resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an ink jet head, and more particularly, to a drop generator for an ink jet printer.

[0002]

2. Description of the Related Art A droplet jet recording head having a chamber for accommodating a recording liquid to be introduced and an orifice for communicating with the chamber and discharging the liquid as small droplets is well known. In manufacturing such a droplet jet recording head, a substance insoluble in the liquid is printed and laminated on a substrate to form a partition wall portion of a groove corresponding to the chamber, and then the groove is formed at an upper end of the partition portion. There has been proposed a droplet jet recording head in which holes for forming the chamber and the orifice are formed by joining the above-mentioned covers (Japanese Patent Laid-Open No. 55-109670). As described above, since the partition of the groove is formed and the cover of the groove is joined to the upper end of the partition, the number of manufacturing steps is large, which is disadvantageous in cost.
As another manufacturing method, there has been proposed a method in which an ink flow path of a head is formed of a photosensitive composition (Japanese Patent Application Laid-Open No. Sho.
This method requires the use of a complicated photolithography process from exposure to phenomena to curing, and has disadvantages such as being disadvantageous in cost.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and particularly, has enabled the mass production of ink jet drop generators.
The purpose is to reduce costs.

[0004]

In order to achieve the above object, the present invention provides a heating element group comprising a plurality of heating elements, electrodes for supplying electricity to the heating element group, and an ink-resistant protective layer. A heating element substrate, a liquid chamber to which ink is supplied from an ink inlet, and a flow path group including a plurality of flow paths communicating with the liquid chamber and arranged in parallel with each other are provided. And a lid substrate integrally formed substantially symmetrically with respect to a center line passing through the center of the plurality of flow path groups, wherein the heating element group and the flow path group face each other. The heating element substrate and the lid substrate are laminated and configured.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described. FIG. 1 is a perspective view showing an embodiment of a drop generator according to the present invention, and FIG. 2 is a cover substrate (FIG. 2A) and a substrate (FIG.
FIG. 3 is an exploded perspective view of (b)), and FIG. 3 is a perspective view of the lid substrate viewed from the back side, in which 1 is a lid substrate, 2 is a substrate, 3 is a liquid inlet, 4 is a liquid outlet, and 5 is The groove, 6 is a region for forming a room, 7 is an individual lead electrode, 8 is a common lead electrode, 9
Is a heating element, and a heating element 9 is formed on the surface of the substrate 2 together with the lead electrodes 8.

Conventionally known processes for manufacturing a thermal head can be applied to the construction of these lead electrode heating elements and the like, and since the process is a well-known technique among those concerned, a description thereof is omitted here. . Here, for simplicity of description, only the lead electrodes and the heating element are shown, but more strictly, an ink-resistant protective layer, an insulating layer and the like (not shown) are provided as necessary. Lid substrate 1
The groove 5 forms a liquid (ink) flow path and a discharge port 4, and the area 6 defines a room for accommodating the recording liquid (ink) introduced from the inflow port 3. Form. Conventionally, this lid substrate (discharge port-flow path-liquid chamber part)
After forming the partition wall of the groove, the cover may be joined (Japanese Patent Application Laid-Open No. 55-109670) or may be complicated (many steps).
Using a photolithography process (Japanese Patent Application Laid-Open No. 56-123869)
However, in the present invention, it is manufactured by integral molding of a resin, for example.

As the resin, those which can be molded by a usual method can be widely used. For example, acrylic resin, phenol resin, urea resin, melamine resin, polyester resin, epoxy resin, polystyrene resin, vinyl resin, ABS resin , Allyl resin, silicone resin, vinylidene chloride, polyethylene, polypropylene, polyamide resin, polyacetal, polycarbonate, acetylcellulose, AS resin, methacrylic resin, and the like. It is also possible to further increase the strength by mixing fillers such as graphite, carbon, calcium sulfate and iron oxide. The lid substrate 1 and the substrate 2
Are bonded using, for example, a thermosetting epoxy adhesive or an ultraviolet curing adhesive.

[0008]

According to the present invention, by forming a lid substrate in which a flow path, a liquid chamber, and an ink inlet are integrally formed, a heating plate and a lid substrate are laminated to form an ink jet head. The assembly is easier than an ink jet head manufactured by separately forming chambers and the like, and remarkable effects can be obtained in mass production and cost reduction.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a drop generator according to the present invention.

FIG. 2 is an exploded perspective view of a lid substrate and a substrate constituting the drop generator.

FIG. 3 is a perspective view of the lid substrate as viewed from the back side.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Lid board | substrate, 2 ... Substrate, 3 ... Fluid inlet, 4 ... Liquid discharge port, 5 ... Groove, 6 ... Area for forming a room, 7 ... Individual lead electrode, 8 ... Common lead electrode, 9 ... Heat generation body.

Claims (1)

[Claims] 1. A heating element substrate provided with a heating element group including a plurality of heating elements, an electrode for energizing the heating element group, and an ink-resistant protective layer, and a liquid supplied with ink from an ink inlet. A chamber and a flow path group consisting of a plurality of flow paths arranged in parallel with each other and provided in parallel with the liquid chamber are provided, and a center line parallel to the flow paths and passing through the center of the plurality of flow path groups is provided. A lid substrate that is integrally formed substantially symmetrically with respect to the heating element group and the lid substrate so that the heating element group and the flow path group face each other. Characteristic inkjet head.