DE2232995B2 - Device for the selective electroplating of reticulated parts - Google Patents

Description

The invention relates to a device for the selective electroplating of reticulated parts, with one channel for supply and one channel for draining the electrolyte.

Such a device is known from US Pat. No. 3,152,589. In this case, the inlet and outlet channels are for the electrolytes are arranged concentrically to one another and brought up to the part to be electroplated on one side. The known device is for electroplating parts with a closed surface intended; However, it can also be part "; with reticulated Surface to be galvanized. However, the partial area to be electroplated cannot be precisely determined, because the electrolyte passes through the reticulated surface and thus the surface to be electroplated on the side of the part facing away from the channels cannot be precisely determined.

This leads to unnecessarily high material losses, which are correspondingly costly in the case of expensive materials. For example When assembling integrated circuits, the crystal must be welded together with the circuit on the gold-plated surface of the rectangular frame, its mesh surface is about 40 times larger than would be required to weld the crystal.

The invention is therefore based on the object of providing a device for the selective electroplating of To create reticulated parts with which they can be electroplated selectively and / was on both sides.

This object is achieved by the measures covered by claim i.

The device according to the invention not only has the advantage that with her reticulated parts at the same time can be galvanized on both sides. In addition, since the supply channel is coaxial with the discharge channel can be arranged, the minimum coatable area can be kept much smaller can. In the known device namely the discharge channel encloses the supply channel, so that the minimum coatable surface in the known device is more than 4 times larger than in the invention.

Preferred developments and configurations of the device according to the invention are the subject matter of the dependent claims 2 and 3.

With complete coating of the frames of integrated circuits, an average of 80 g Consumed gold for 1000 frames, millions of which are produced. By the device according to the invention the consumption of gold can be reduced by up to 6 g of gold per 1000 frames. As a result the gold savings for only 10 million devices produced is 740 kg gold, which is at an invoice price of 1,500 rubles per 1 kg of gold represents a saving of 1,110,000 rubles.

The invention is explained in more detail using the exemplary embodiment shown in the drawing. It shows

F i g. 1 shows the partially cut perspective view of a device for selective electroplating of reticulated parts and

F i g. 2 shows the front view of several locally coated reticulated parts.
The device for the selective electroplating of flat, net-shaped parts consists of a main container, here a bath 1 (FIG. 1), a pump 2, an intermediate container 3 with a filter 4 and a working element 5 for coating the parts.
The working element 5 for coating the parts is arranged separately from the main container and is designed in the form of a multi-point cassette, which consists of a body 6 with a transfer channel 7 and a system of several supply channels 8 (FIG. 1 shows a channel). In the lower area of the supply ducts 8 nozzles are installed, which consist of nozzles 9, intermediate layers 10, seals 11 and nuts 12. The lower part of the cassette is designed as a movable pressure strip 13 on which lower sealing washers 14, movable bushings 15 and compensating nozzles 16 are mounted.

A part 17 which has a flat mesh surface is pressed in between the sealing washer 14 and the seal U (FIG. 2).
The local coating of flat network parts is carried out as follows. The electrolyte is passed from the bath 1 with the aid of a pump 2 into an intermediate container 3 in which the anode 18 is accommodated. After passing through the filter 4, the electrolyte is passed through a slot 19 into the main space of the multi-point cassette.

The excess electrolyte in the intermediate container 3 is discharged into the bath 1 through a channel 20. the end the multi-point cassette is the electrolyte through the channels 8, the nozzle 9, the seal 11, which with the help the nut 12 is pressed against the socket, passed to the areas of the part 17 to be coated.

The sealing of the coating zone, i.e. H. their isolation, with the aid of the seal 11 and the sealing washer 14 is reached.

The part 17 is pressed against the seals 11 and 14 by means of the bar 13 which is movable in the vertical direction. With the aid of a flat spring 21, the negative potential is fed to the part 17.
The electrolyte is fed back into the bath 1 through the compensation nozzle 16.

1 sheet of drawings

Claims (3)

Patent claims: 1. Device for the selective electroplating of reticulated parts, with a channel for supply and a channel for discharging the electrolyte, characterized in that the supply channel (8) is on the one and the discharge channel the other ropes of the reticulated part (17) to be coated is arranged, and can be pressed against the part Seals (11, 14) are provided which delimit the zone to be coated. 2. Apparatus according to claim 1, characterized in that the supply channel (8) and an overflow channel (7) are connected to one another via the main room of a multi-location cassette (6 to 16), and that the discharge channel is provided with a compensating nozzle (16). 3. Apparatus according to claim 1 or 2, characterized in that several supply and discharge channels are connected in parallel to each other.