JPH0698761B2 - Inkjet head - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a drop generator for ejecting a liquid, and more particularly to a drop generator for an inkjet printer.

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 to eject the liquid as a small droplet is well known. In manufacturing 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 covered at the upper end of the partition wall portion. A jet recording head for droplets has been proposed which is joined to form a hole to be the chamber and an orifice (JP-A-55-109670). Since the partition wall of the groove is formed and the cover of the groove is bonded to the upper end of the partition wall, the number of manufacturing steps is large and the cost is disadvantageous. As another manufacturing method, a method of forming an ink flow path of a head with a photosensitive composition has been proposed (Japanese Patent Laid-Open No. 56-12386), but this method has a complicated process of exposure to development to curing. It is necessary to use a photolithography process, which is disadvantageous in terms of cost.

The present invention was made in view of the above-mentioned actual circumstances,
In particular, the purpose of the present invention is to enable mass production of an inkjet drop generator and thus reduce costs.

In order to achieve the above object, the present invention provides a heating element substrate including 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 an ink. A liquid chamber to which ink is supplied from an inflow port and a flow channel group including a plurality of flow channels communicating with the liquid chamber and arranged in parallel to each other are provided, and the plurality of flow channels parallel to the flow channels are provided. A lid substrate integrally molded with resin substantially symmetrically with respect to a center line passing through the center of the passage group, and the heating element substrate and the lid substrate such that the heating element group and the flow channel group face each other. It is characterized by being configured by laminating and. Hereinafter, description will be given based on examples of the present invention.

FIG. 1 is a perspective view showing an embodiment of a drop generator according to the present invention, and FIG. 2 is a lid substrate (FIG. 2 (a)) and a substrate (FIG. 2 (b)) which constitute the drop generator. FIG. 3 is an exploded 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, 5 is a groove, and 6 is a groove. Is a region for forming a room, 7 is an individual lead electrode, 8 is a common lead electrode,
A heating element 9 is formed on the surface of the substrate 2 together with the lead electrodes 7 and 8. A conventionally known manufacturing process of a thermal head can be applied to the configuration of the lead electrode heating element and the like, and the process is a well-known technique among the parties concerned, and therefore the description thereof is omitted here. However, although only the lead electrode and the heating element are shown here for the sake of simplicity of explanation, more strictly, an ink resistant protective layer, an insulating layer, and the like (not shown) are provided as necessary. By joining the lid substrate 1 and the substrate 2, a groove 5 liquid (ink) flow path and an ejection port 4 are formed, and a region 6 is for accommodating a recording liquid (ink) introduced from the inflow port 3. Form a room (liquid room). Conventionally, this lid substrate (ejection port-flow passage-liquid chamber portion) has a complicated partition (a large number of steps) after forming a partition wall of a groove and then joining a cover (JP-A-55-109670). ) Using photolithography process
56-123869), but in the present invention, it is manufactured by integral molding of resin. 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, lysicon resin, vinylidene chloride, polyethylene, polypropylene, polyamide resin, polyacetal, polycarbonate, acetyl cellulose, AS resin, methacrylic resin, etc., but these resins include silicic acid. It is also possible to further increase the strength by mixing fillers such as aluminum, calcium carbonate, zirconium silicate, graphite, carbon, calcium sulfate and iron oxide.

The lid substrate 1 and the substrate 2 are bonded to each other by using, for example, a thermosetting epoxy adhesive or an ultraviolet curing adhesive. Further, as can be seen from FIG. 3, the lid substrate is
It has a flow channel group composed of a plurality of flow channels and a liquid chamber communicating with the flow channel group, and is integrally molded of resin substantially symmetrically with respect to the center line of the flow channel group.

Effect As is clear from the above description, according to the present invention, since the lid substrate for forming the discharge port, the flow path, and the liquid chamber is formed by resin integral molding, the mass productivity is high and the cost is significant. It is possible to go down. Further, since the lid substrate is configured to be substantially symmetrical with respect to its center line, the temperature distribution becomes uniform when the lid substrate is integrally molded with resin, and the lid substrate with less distortion can be molded. Further, since the flow passage and the liquid chamber are integrally formed, it is not necessary to attach the liquid chamber with an adhesive or the like, the clogging of the flow passage due to the adhesive or the like is eliminated, and the discharge performance can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a drop generator according to the present invention, FIG. 2 is an exploded perspective view of a lid substrate, a substrate, and a substrate constituting the drop generator, and FIG.
It is the perspective view which looked at the lid substrate from the back side. 1 ... Lid substrate, 2 ... Substrate, 3 ... Liquid inlet, 4 ...
Liquid ejection port, 5 ... Groove, 6 ... Region for forming room, 7 ... Individual lead electrode, 8 ... Common lead electrode, 9
...... Heating element.

Claims (1)

[Claims] 1. A heating element substrate comprising a heating element group composed of a plurality of heating elements, an electrode for energizing the heating element group, and an ink-resistant protective layer, and a liquid to which ink is supplied from an ink inlet. A chamber and a flow channel group that is in communication with the liquid chamber and is formed of a plurality of flow channels that are arranged in parallel to each other; and a center line that is parallel to the flow channels and that passes through the center of the plurality of flow channel groups. And a lid substrate integrally formed of resin in a substantially symmetrical manner, and the heating element substrate and the lid substrate are laminated so that the heating element group and the flow channel group face each other. Characteristic inkjet head.