JPH03169559A - Manufacture of ink jet head - Google Patents

Abstract

PURPOSE:To prevent a failure in ink flying caused by the misregistration of a nozzle plate to a substrate and the clogging of nozzle holes with an adhesive by a method wherein after a plastic or metallic nozzle plate is bonded to a plastic head substrate provided with a base of a polymeric resin, the nozzle holes are made by a laser or drill. CONSTITUTION:Firstly, a plastic head substrate 1 is injection molded with a plurality of flow paths 3 using a base of a polymeric resin, such as polysulfone. On the other hand, a nickel plate 4 provided with a line of psi50-psi60mum nozzle machining holes 4a is electroformed. After that, a plastic nozzle plate 2, the material of which is not particularly limited, is bonded on the head substrate 1 on the opposite side to the flow paths 3. The nickel plate 4 is brought into close contact with the plastic nozzle plate 2 bonded on the head substrate 1. Nozzle holes 3a are made through the plastic nozzle plate 2 and the adhesive layer 7 by a laser beam 6 so that the head substrate 1 is perforated. After the nozzle holes 3a are made, the flow paths 3 are washed, and a diaphragm 8 made of the same material as the head substrate 1 is bonded on the head substrate 1 on the opposite side to the front of the nozzle.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method of manufacturing an inkjet head that forms an image on a recording medium by ejecting ink droplets. [Prior art] Since it is impossible to make holes in a plastic substrate with a diameter small enough to be used for the nozzles of an inkjet head using the injection molding method, conventionally, a metal nozzle plate with pre-drilled holes is glued to the substrate. manufactured inkjet heads.

[Problem to be solved by the invention]

However, the above-mentioned method has the problem that misalignment occurs between the nozzle plate and the substrate, and the nozzle is clogged by the adhesive, which significantly worsens the flight of ink droplets. [Means for Solving the Problems] In order to solve such problems, in the method of the present invention, after a plastic or metal nozzle plate is bonded to a plastic head substrate whose base material is a polymer resin, A nozzle hole that communicates with the flow path of the head substrate is machined on the nozzle plate using a laser or a drill. [Function] By drilling holes in the nozzle after bonding the nozzle plate, it is possible to prevent ink from flying poorly due to misalignment between the nozzle plate and the substrate, and from clogging the nozzle hole due to adhesive. [Examples] Examples of the method of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory diagram of a first embodiment of the invention set forth in claim (1). In this embodiment, first, a plastic head substrate 1 made of a polymer resin such as polysulfone, polyethersulfone, or polycarbonate, on which a plurality of channels 3 are formed, is molded by injection molding. In addition, a hole 4 for nozzle processing with a diameter of 50 to 60 μm is also available.
Electrospun a nickel plate 4 on which a is arranged in a row. Thereafter, a nozzle plate 2 made of plastic, which is not particularly limited in material, is adhered to the side of the head substrate 1 where the flow path 3 is not provided with an adhesive 7 (FIG. 1(a)). Next, a nickel plate 4 is closely attached to the plastic nozzle plate 2 bonded to the head substrate 1, and a laser beam (for example, an excimer laser) 6 is used to connect the plastic nozzle plate 2 and the bond so that it communicates with the head substrate 1. A nozzle hole 3a is made in the layer 7 (FIG. 1(b)). The nickel plate 4 is positioned using a nozzle plate positioning dowel 5. After opening the nozzle hole 3a, the flow path 3 is cleaned, and a diaphragm 8 made of the same material as the head substrate 1 is bonded to the side opposite to the front surface of the nozzle (FIG. 1(C)).

FIG. 2 is an explanatory diagram of a second embodiment of the invention described in claim (1).The plastic head substrate 1 is injected or shaped, and the nickel plate 4 is prepared.Then, the head A plastic diaphragm 8 made of the same material as the substrate 1 is welded to the surface of the head substrate 1 on the side where the flow path 3 is located (FIG. 2(a)).Next, the plastic nozzle plate 2 is attached to the head substrate with adhesive 7. A nickel plate 4 is adhered to the plastic nozzle plate 2 adhered to the head substrate 1, and a plastic nozzle plate 4 is bonded to the head substrate 1 so that it communicates with the flow path 3 of the head substrate 1 using a laser beam (for example, an excimer laser) 6. Nozzle holes 3a are made in the manufactured nozzle plate 2 and the adhesive layer 7 (FIGS. 2(b) and 2(c)).

Note that the nickel plate 4 is positioned by a nozzle plate positioning dowel 5.

FIG. 3 is an explanatory diagram of a third embodiment of the invention described in claim (1). The plastic head substrate 1 is injection-molded and the nickel plate 4 is prepared. Thereafter, a plastic nozzle plate 12 made of the same material as the head substrate 1 is welded to the opposite side of the flow path 3 of the head substrate 1 (FIG. 3(a)). A nickel plate 4 is closely attached to the plastic nozzle plate 12 welded to the head substrate 1, and a laser beam (for example, excimer laser) is applied to the plastic nozzle plate 12.
6, a nozzle hole 3a is made in the plastic nozzle plate l2 so as to communicate with the flow path of the head substrate 1 (FIG. 3(b)). The nickel plate 4 is positioned by a nozzle plate positioning dowel 5. After opening the nozzle hole 3a, a diaphragm 8 made of the same material as the head substrate 1 is welded to the side where the flow path 3 is located (FIG. 3(c)). FIG. 4 is an explanatory diagram of a fourth embodiment of the invention set forth in claim (1). The plastic head substrate 1 is injection-molded and the nickel plate 4 is prepared. Thereafter, a plastic diaphragm 8 made of the same material as the head substrate 1 is welded to the surface of the head substrate 1 on the side where the channel 3 is located (FIG. 4(a)). Next, apply a solvent to the plastic nozzle plate 12 made of the same material as the head substrate 1.
Weld to. A nickel plate 4 is closely attached to the plastic nozzle plate 12 welded to the head substrate 1, and a laser beam (for example, an excimer laser) 6 is applied to the plastic nozzle plate 12 so as to communicate with the flow path 3 of the head substrate 1. Open the nozzle hole 3a (Fig. 4(b)
)(c)). The nickel plate 4 is positioned using a nozzle plate positioning dowel 5. FIG. 5 is an explanatory diagram of a first embodiment of the invention set forth in claim (2). The plastic head substrate 1 is injection molded, and the nickel plate 4 is adhered to the side of the head substrate 1 on which the flow path 3 is not provided using an adhesive 7.
Next, aiming at the row-shaped holes 4a of the nickel plate 4, nozzle drilling is performed on the nickel plate 4 and the adhesive layer 7 using a drill 9 with a diameter of 60 μm to 70 μm.
Figures (a) (b)). Thereafter, the channel is cleaned, and a plastic diaphragm 8 made of the same material as the head substrate 1 is welded to the surface of the head substrate 1 on the side where the channel 3 is located (FIG. 5(C)).

FIG. 6 is an explanatory view of a second embodiment of the invention described in claim (2). The gold B plate 14 is adhered to the side of the head substrate 1 where there is no flow path 3 using the adhesive 7. Next, the gold B plate 14 and the adhesive M7 are drilled using a drill 9 with a diameter of 60 μm to 70 μm. 6th
Figures (a) (b)). Thereafter, the flow path is cleaned, and a plastic diaphragm 8 made of the same material as the head substrate 1 is welded to the surface of the head base 1 that covers the flow path 3 (FIG. 6(c)). [Effects of the Invention] As explained above, in the present invention, after a plastic or metal nozzle plate is bonded to a plastic head substrate based on a polymer resin, six nozzles are opened using a laser or a drill. This makes it possible to drill holes with high precision and eliminates the risk of the nozzle hole becoming clogged with adhesive.

[Brief explanation of the drawing]

FIGS. 1(a), (b), and (c) are explanatory diagrams of a first embodiment by laser processing of the present invention, and FIGS. 2(a), (b), and (C) are illustrations of a second embodiment by laser processing of the present invention. Explanatory diagram of Figure 3 (a
), (b), and (c) are explanatory diagrams of the third embodiment by laser processing of the present invention, and Figures 4(a), (b, and c) are explanatory diagrams of the fourth embodiment by laser processing of the present invention, Figure 5 (a) (b) (
c) is an explanatory diagram of the first embodiment by drilling according to the present invention;
FIGS. 6(a), 6(b), and 6(C) are explanatory diagrams of a second embodiment of the drilling process according to the present invention. 1... Head board 2... Plastic nozzle plate 3... Channel 3a... Nozzle hole 4... Nickel perforated plate 5... Positioning dowel 6... Laser beam 7. ...Adhesive layer 8...Plastic diaphragm l2...Plastic nozzle plate 14 made of the same material as the head substrate 1...Metal nozzle plate or higher

Claims (2)

[Claims] (1) After a plastic nozzle plate is bonded to a plastic head substrate made of polymer resin as a base material, a nozzle hole that communicates with the flow path of the head substrate is formed in the plastic nozzle plate using a laser. A method for manufacturing an inkjet head characterized by: (2) After joining a metal nozzle plate to a plastic head substrate made of polymer resin as a base material, use a drill to drill a nozzle hole in the metal nozzle plate that communicates with the flow path of the head substrate. A method for manufacturing an inkjet head characterized by: