JPS5839672B2 - Manufacturing method of high precision micro nozzle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a thin-walled micronozzle for inkjet.

Nozzles used for inkjet blinking have a high-precision micro diameter (approximately 50 to 100μ), a thin wall (approximately 10μ), and a good end surface finish (approximately 1. , RmOx), etc., and clear and reliable numbers and characters can be obtained by satisfying the above conditions.

Conventionally, inkjet nozzles have been produced by drawing a glass or metal tube into a thin tube, which is then mechanically cut.

However, according to this method, it is extremely difficult to obtain highly accurate minute diameters, and furthermore, it is almost impossible to obtain uniformly thin walls.

Furthermore, as for finishing the end surface, simply mechanical processing results in a rough surface, and lapping or the like is required, but lapping also has the disadvantage of causing droop on the end surface.

The object of the present invention is to eliminate these drawbacks and to provide a nozzle which has a highly accurate micro diameter, a thin wall, and a good finish on the end surface by electroforming and polishing.

FIG. 1, FIG. 2, FIG. 3, and FIG. 4 are sectional views of each process showing an embodiment of the present invention, and will be explained in order below.

As shown in Fig. 1, reference numeral 1 denotes a matrix made of aluminum, one end of which has a cylindrical shape and a cone angle of about 60°, and has a diameter of 101t.
It is nickel plated with a thickness of 2.

3 protects the conical end a of the matrix 1 and the nickel plating 2 with a protective metal made of copper.

The mother mold 1 and the protective metal 3 are each covered with a cap 4 made of Bakelite, and the mother mold 1, the protective metal 3 and the cap 4 are simultaneously supported by the support frame 5, and when electroforming is performed in an electrolytic solution, the copper electrolyte is formed. A fitting part 6 is formed.

After electroforming, a filler 7 is filled between the conical part of the mother die 1 and the protective metal 3 as shown in FIG. 2, and the outer shape is formed.

Note that the end face AA is processed until the conical end a of the nickel plating 2 appears.

From the time when the conical end a of the master mold 1 begins to appear until the desired nozzle diameter b (for example, 50 μm) shown in FIG.

After polishing the nozzle end face, the matrix 1 and the filler γ are dissolved and removed with a caustic soda solution to obtain the finished product shown in FIG.

As described above, according to the present invention, the wall thickness of the nozzle end can be controlled by the plating thickness formed by plating, and a nozzle end with a desired thickness can be reliably obtained.

Since the amount of polishing can be appropriately selected while measuring the nozzle diameter with a microscope, extremely high precision can be obtained.

The final finish of the nozzle end is 0.1.0 using #8000 abrasive paper or abrasive grains. , , is greater than or equal to Rmax.

Further, the nozzle end is protected by the protective metal 3 and the copper electrodeposited portion 6, and is fixed with a filler material γ such as resin, so that it is possible to obtain a reliable nozzle end without droop.

Note that the protective metal 3 and the copper electrodeposited portion 6 also serve to protect the nozzle end in actual use.

As described above, the present invention provides a high-precision micro nozzle that does not require sophisticated skill or equipment unlike the drawing of glass capillary tubes, metal capillary tubes, etc., and can completely satisfy the required conditions.

[Brief explanation of the drawing]

1, 2, 3, and 4 are cross-sectional views of each step for explaining an embodiment of the present invention, in which a is a conical tip, AA is an end face cut at three points, b is the nozzle diameter,
1 is a matrix, 2 is a nickel plating, 3 is a protective metal, 4 is a cap, 5 is a support frame, 6 is a copper electrodeposition part, and 7 is a filler.

Claims (1)

[Claims] 1. Thin a matrix having a conical end at one end, cover the conical part of the matrix with a protective metal, and then electroform the matrix and the protective metal at the same time, and form a gap between the conical part and the protective metal. A method for producing a high-precision micro nozzle, comprising: filling a filler with a filler, and after forming the outer shape, micro-polishing the tip of the conical part until it reaches a desired nozzle diameter, and dissolving and removing the matrix and the filler. .