JPS6023317Y2 - Electrode for partial plating - Google Patents

Description

[Detailed explanation of the idea] (a) Technical field of the invention The present invention relates to an improvement of an electrode for partial eyelids.

(b) Background of the Technology For electrical parts that use expensive plating materials such as gold, it is common to partially plate only the minimum necessary parts in order to reduce costs.

An example of such an electrical component that is partially plated is shown in FIG.

FIG. 1 is a perspective view of a connector, in which a large number of contacts 2 are insert-molded and arranged in parallel on a rectangular parallelepiped insulator 4. FIG.

The desired number of contacts 2 is one, and the contact preparatory section 2A,
It is divided into groups 2B and 2C.

The first contact 2 and the last contact 2 of the connector 1
The distance from each contact group 2A, 2B,
The distance between the first contact 2 and the last contact 2 within 2C is 1.

Further, the distance between the contact preparatory sections 2A, 2B, and 2C is sufficiently larger than the contact pitch within the same contact group.

A contact portion 3 is formed at the tip of each contactor 2 and is plated with gold, for example.

A means for partially plating only one side of the contact portion 3 of the connector configured as described above will be described with reference to FIG. 2.

FIG. 2 is a sectional view of the partial plating apparatus.

In the figure, reference numeral 5 denotes a lower mold made of plate-shaped resin, and a receiving plate 6 made of a silicone rubber plate is fixed to the upper surface of the lower mold 5.

Two connectors 1 are placed on the upper surface of the receiving plate 6 so that the contact portions 3 face each other.

8 is a shallow box-shaped upper mold, and a rectangular window 8a having a desired size in plan view is provided approximately in the center of the lower bottom plate.

. A substantially rectangular parallelepiped-shaped electrode 11 whose length is desirably larger than the distance between the contacts 2 at both ends of the connector 1 is fixed to the lower surface of the upper bottom plate of the upper mold 8, facing the window 8a. A plurality of nozzles 9 are provided on the side plate for ejecting the plating liquid 12 toward the electrodes 11, and a plurality of discharge ports 10 for discharging the plating liquid 12 are provided on the other side plate.

Reference numeral 7 denotes a mask made of a silicone rubber plate, which is fixed to the lower bottom plate in correspondence with the window 8a of the upper mold 8.

The mask 7 is provided with a rectangular window whose length is desirably longer than the distance MI of the contacts 2 and whose width is equal to the distance between the bases of the contact portions 3 of the opposing contacts 2.

The upper mold 8 to which the mask 7 as described above is fixed is connected to the connector 1
The plating liquid 12 is jetted from the nozzle 9 onto the contact portion 3, and the electrode 11 is energized to perform partial plating.

The contact 2 has a mask 7 and a receiving plate 6 except for the contact part 3.
Since the contact portion 3 is airtightly sandwiched between the contact portions 3 and 3, the plating liquid 12 does not seep through, and only the upper surface of the contact portion 3 can be partially plated.

In addition, if it is static plating, approximately 4 powders are required to plate to a thickness of 100 lum, but by jetting, the time required to add 1000 lums of powder is approximately W seconds.

(C) Prior art and problems Figure 3 is a perspective view of a conventional electrode turned over, with electrode 1
1 is a rectangular parallelepiped whose length is desirably greater than the distance 1 between the contacts 2 at both ends of the connector 1 .

There are two types of materials: those in which the entire surface of titanium is plated with an insoluble metal (for example, platinum, rhodium, etc.) or a box of these metals is welded, and those in which the entire electrode is made of platinum or the like.

However, the former suffers from significant wear due to cavitation caused by gas during plating or by a jet of plating solution, resulting in a short lifespan.

Although the latter has a long life, it has the problem of high cost because the entire material is made of expensive platinum.

Furthermore, both methods have the problem that charges are concentrated on the contacts at both ends of each contact group, and the plating thickness becomes thicker, resulting in uneven plating thickness distribution of each contact.

(d) Purpose of the invention The purpose of the present invention is to provide an electrode for partial plating that eliminates the above-mentioned conventional problems.

(e) Structure of the Device In order to achieve this object distantly, the present invention consists of a titanium electrode bed having a substantially rectangular parallelepiped shape with a desirably long recess provided on its longitudinal surface, and a substantially rectangular parallelepiped-shaped titanium electrode bed fitted into the recess. a current shielding block, and a platinum electrode plate inserted parallel to the longitudinal side of the titanium electrode bed and facing the partially plated portion of the workpiece in the gap formed between the side surface of the current shielding block and the side surface of the recess. and the length of the end face on the front side of each of the platinum electrode plates is equal to the length of each partially plated portion of the workpiece.

(f) Embodiments of the invention The invention will be described in detail below with reference to illustrated embodiments.

FIG. 4 is a perspective view of an embodiment of the present invention when A is turned over, and the opening is a cross-sectional view taken along chain line M-M in A.

In the same figure, reference numeral 13 denotes a titanium electrode bed having a substantially rectangular parallelepiped shape that is longer than the length of the workpiece to be partially plated, and a substantially square groove 13b is formed on the longitudinal surface.
In the trunk portion b, a rectangular recess 13a is formed in a deeper plan view.

The number of branches of the recess 51ab is one more than the number of contact groups of the connector of FIG.

Further, the distance between adjacent branches is equal to the distance 11 between the first contact and the last contact 2 in the contact group, and the width of each branch is equal to the distance between the contact groups.

Reference numeral 14 denotes a current shielding block made of, for example, vinyl chloride resin, whose flat surface corresponds to the groove 13b of the titanium electrode bed 13.
It is formed in the same shape as the recess 13a and the groove 13.
It is fitted in b.

A gap of a desired width is provided between the side surface of the recess 13a and both side surfaces of the main body of the current shielding block 14, and the length of each gap is equal to the distance 1□ between the contacts at both ends of the contact group. A long plate-shaped platinum electrode plate 15 is attached to the titanium electrode bed 13.
It is press-fitted parallel to the long side of the.

The upper surface of the current shielding block 14 protrudes as desired from the upper surface of the titanium electrode bed 13, and the upper end surface of each platinum electrode plate 15 is approximately flush with the upper surface of the current shielding block 14. There is.

Therefore, the upper part of the outer side surface of the platinum electrode plate 15 is exposed from the titanium electrode bed 13, so that the contact area with the plating solution is increased.

In this way, the electrode plate with a length of 1 □, which is equal to the length of the partially plated part of the workpiece, is mounted facing each partially plated part, so that electric charges are not concentrated locally.
Partial plating with uniform plating thickness distribution can be obtained.

Note that titanium has an oxide film formed on its surface by the plating solution, and is insulated from the plating solution.

(g) Effects of the invention As explained above, the invention uses a platinum electrode plate only on the part facing the part to be plated on the workpiece, resulting in lower cost, longer life, and more uniform plating thickness. It is an electrode for partial plating that has excellent practical effects such as being able to obtain .

[Brief explanation of the drawing]

Figure 1 is a perspective view of the connector, Figure 2 is a cross-sectional view of the partial plating device, Figure 3 is a perspective view of a conventional electrode turned over, and Figure 4 is an electrode of an embodiment of the present invention, with A turned over. The perspective view is a sectional view taken along chain line M-M in A. In the figure, 1 is the connector, 2 is the contact, 3 is the contact part, 5 is the lower mold,
6 is a receiving plate, 7 is a mask, 8 is an upper mold, 9 is a nozzle, 11 is an electrode, 12 is a plating solution, 13 is a titanium electrode floor, 13a is a recessed part, 13b is a groove, 14 is a current shielding block, 15 is A platinum electrode plate is shown.

Claims (1)

[Scope of utility model registration request] A titanium electrode bed in the shape of a substantially rectangular parallelepiped with a desirably long recess provided on its longitudinal surface, a current shielding block in the shape of a substantially rectangular parallelepiped fitted in the recess, and a current shielding block in parallel with the longitudinal side of the titanium electrode bed. A platinum electrode is provided in the gap formed between the side surface of the current shielding block and the side surface of the recess to face the partially plated portion of the workpiece, and the surface length of each platinum electrode is equal to the length of each of the workpiece. An electrode for partial plating, characterized in that the length of the partial plating part is equal to the length of the partial plating part.