JPH0571672B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing micro nodules such as inkjet nozzles, particularly by electroforming.

Conventionally, nozzles have been made using various methods, including electroforming, which has features such as a smooth inner surface that allows fluid to pass through.

Representative examples are shown in FIGS. 1 and 2. First, to explain Fig. 1, a hole is made at the tip of a mold 1 with a sharp tip and an insulating rod or pipe 2 made of plastic or glass is inserted into the mold. After the treatment, it is connected to a negative electrode and a metal A such as copper or nickel is electrodeposited thereon, and then the nozzle A is obtained by peeling it off from the mold. The method shown in Fig. 2 is a method in which an insulating material is applied to the tip. For example, the tip of the mold 1 is immersed in molten wax to a certain depth, a mold with an insulating material 3 formed thereon is used, and the above-mentioned method is applied. This is a method of obtaining Nozzle A by electroforming method, similar to the above.

In the method shown in FIG. 1, the hole diameter can be guaranteed, but it is difficult to fit the mold 1 and the insulating rod 2 without a gap, and electrodeposition occurs even in this gap, often making it impossible to peel it off. Also, it is nearly impossible to create nozzles with a pore diameter of several tens of microns using this method in terms of mass production.
Furthermore, the method shown in FIG. 2 has the disadvantage that it is difficult to uniformly apply the insulator, and the pore diameter changes due to the overhang of the electrodeposited insulator. Generally, when the hole diameter of the nozzle is small, the thickness of the plate at the nozzle exit is also required to be thin, but the conventional method described above has the disadvantage that the area around the hole becomes thicker.

In the method of the present invention, a mold 1 with a simple shape with a pointed tip is used, and a minute nozzle with a thin plate at the nozzle exit and a highly accurate hole diameter is manufactured by electroforming. be.

First, referring to FIG. 3, electroforming is performed with a mold 1 having a sharp tip inserted into a soft metal substrate 4 under a constant pressure. At this time, since the electrodeposition B is also applied to the substrate 4, the area near the exit of the tip nozzle becomes thin. Electrodeposition A and Electrodeposition B
and meet at an acute angle, so in electroforming, a parting line is created and they are easily separated.

To explain Fig. 4, a soft metal 4 is formed to a certain thickness on a hard metal substrate 5, and a similar mold is inserted into the soft metal 4. By adjusting the thickness of the soft metal 4, the depth of insertion can be adjusted. Therefore, this is a method for manufacturing hole diameters with higher precision.

In FIG. 5, a metal plate 6 having a hole 7 is manufactured by photoablation or the like, and the tip of the mold 1 is fitted into the hole and electroformed in the same manner.

As shown in FIG. 6, the mold 1 does not necessarily have to have a completely pointed shape, and may have a minute flat surface 8 at the tip.

Examples are shown below.

Example 1 Based on FIG. 4, solder 4 was poured onto an iron plate 5 and cut to a thickness of 40 μm. A mold 1 with a cone angle of 60° at the tip was pressed onto this, inserted into the solder 4, and electroformed to obtain a nozzle with a hole of 48 μφ.

Example 2 Based on FIG. 5, first, a substrate 6 having holes 7 was formed on a stainless steel plate by a known method, a photoresist was formed on the portion corresponding to the hole, and nickel electroforming was performed on this. A metal plate 6 with a hole 7 of 40 μφ was made. A die 1 with a sharp conical tip was crimped onto this, and after electroforming to a predetermined thickness using Nickel electroforming A, the hole was peeled off from the metal plate 6 and the die 1 and had the same diameter as the hole described above. A product with pores was obtained.

The method of the present invention provides a nozzle manufacturing method that not only facilitates mold manufacturing but also enables mass production with high precision.

[Brief explanation of the drawing]

1 and 2 are sectional views showing an embodiment of a conventional method, and FIGS. 3 to 6 show an embodiment of the present invention. Figure 3 is a cross-sectional view when soft metal is used;
Figure 4 is a cross-sectional view when soft metal and hard metal are used in layers, Figure 5 is a cross-sectional view of an example in which a hole is provided in the substrate, and Figure 6 is a cross-sectional view of an example in which a hole is provided in the substrate. FIG. Explanation of symbols, 1...Type, 2...Insulating rod, 3...
Insulator, 4...Substrate of soft metal, 5...Substrate of hard metal, 6...Substrate with hole, 7...Hole, 8...Flat surface of tip of mold, A...Electricity attached to mold Kimono, B...
...electrodeposition on the board.

Claims (1)

[Scope of Claims] 1. A nozzle mold with a sharp tip is attached to a soft metal substrate with only its tip, or a nozzle with a sharp tip is attached to a soft metal layer provided on a hard metal substrate. Only the tip of the mold is sealed by inserting the mold into a hole made in a metal plate, or by crimping a conical but flat part without a sharp tip to the metal plate. A method of manufacturing a micro nozzle by electroforming and blocking the electrodeposition. 2. A method for manufacturing a micronozzle according to claim 1, which is made by electroforming a nozzle mold with a sharp tip onto a soft metal substrate with the tip portion attached to a constant width under a constant pressure. . 3 Form a soft metal layer of a certain thickness on a hard metal substrate, insert the tip of a nozzle mold with a sharp tip into the soft metal up to the hard metal, and electroform it. , a method for manufacturing a micro nozzle according to claim 1. 4. The scope of the claim, which is made by manufacturing a metal plate with a hole, inserting the tip of a nozzle mold with a pointed tip into the hole in a sealed manner, blocking that part, and performing electroforming. 2. The method for manufacturing a micronozzle according to item 1. 5 It has a conical shape but has a blunt tip.
Press the tip of the flat nozzle mold onto the substrate,
A method for producing a micro nozzle according to claim 1, which is produced by electroforming.