JPH0358156B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a slip ring assembly for use in various types of equipment using a rotating body gyro.

As shown in Fig. 1, a slip ring assembly used in a device using a rotary gyroscope has a plurality of slip rings 2, each having a lead wire 1 welded to its inner circumferential surface, integrally mounted on the outer circumference of an epoxy resin support shaft 3 at regular intervals. The lead wire 1 of each slip ring 2 is led out to the end of the support shaft.

Conventionally, in order to manufacture a slip ring assembly 4 having such a structure, first a plate made of a conductive material is pressed out to form the slip rings 2, and then lead wires 1 are welded to the inner peripheral surface of each slip ring 2. Next, a plurality of slip rings 2 are arranged and set at regular intervals in a mold, and the lead wires 1 of each slip ring 2 are led out of the mold, and then the mold is filled with epoxy resin and supported. While the shaft 3 is molded, slip rings 2 are integrally formed on the outer periphery at regular intervals, and then the outer periphery is cut and polished for finishing shaping.

However, in this manufacturing method, it is difficult to align the lead wires 1, and the lead wires 1 often get entangled with each other, resulting in a loss of insulation, and epoxy resin is deposited in the gap between the slip rings 2. There were problems such as it was difficult to flow in, resulting in pinholes, and when the outer periphery was cut in the final process, it broke.

In particular, slip ring assemblies are required to be even smaller due to the miniaturization of the devices they are incorporated into, but as mentioned above, due to the entanglement of each lead wire, it is necessary to have more than 10 lead wires for an outer diameter of 3 mm or less. There was a problem in that it was impossible to actually make a small slip ring 2 that could be passed through.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a method for manufacturing a slip ring assembly that is small in size, has high insulation properties, and has high strength.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A method of manufacturing a slip ring assembly according to the present invention will be explained below with reference to the drawings. As shown in Figure 2
A reinforcing core rod 7 is a rod 5 made of Be-Cu, SUS, etc., coated with an insulating coating 6 using a resin such as epoxy, and then one end of the insulated lead wire or the insulated coating is attached as shown in Fig. 3. Lead wires 8 that have been scraped off and re-insulated with a resin such as epoxy are attached to the adhesive tape 9 at regular intervals, and then wrapped around the reinforcing core rod 7 as shown in FIG. 4 and instantly bonded. Fix it with adhesive and remove the adhesive tape 9. Next, this is put into a mold, one end of the lead wire 8 is guided out of the mold, and the mold is filled with resin such as epoxy to form a cylindrical support shaft 10 as shown in FIG. Form. Next, the same number of annular grooves 11 as the lead wires 8 are formed at regular intervals in the longitudinal direction on the outer peripheral surface of the cylindrical support shaft 10, as shown in FIG. 6a, by grooving. The depth of this grooving is at most such that it does not reach the insulation coating of the lead wire 8, as shown in FIG. 6b. Next, a part of the bottom of the annular groove 11 is deeply cut in an arc shape, the insulation coating of the lead wire 8 is broken as shown in FIG. form. This cutting process is performed one by one for each lead wire, so that different parts of the lead wire 8 are exposed at a part of the bottom of all the annular grooves 11. Next, the annular groove 11
Electroless plating or slip ring assembly or application of conductive paint is performed only on the bottom portion of the electrode 13 to form the electrode 13 as shown in FIG. In the case of electroless plating, sputtering, etc., since it adheres to the entire surface of the annular groove 11, etching treatment is performed using a resist or the like so that it remains only at the bottom. Next, each lead wire 8 is passed through and electroplated 14 is applied inside the annular groove 11 as shown in FIG. This plating is done after applying Cu plating of several microns to several tens of microns.
Plating with precious metals such as Au or Au alloys, or directly plating with precious metals such as Au or Au alloys. In this way, the plating thickness is adjusted to the annular groove 11 as shown in the figure.
The depth of the groove is greater than the depth of the groove, and the groove is made to protrude from the outer circumferential surface of the support shaft 10. Thereafter, as shown in FIG. 10, the outer peripheral surface of the support shaft 10 is cut to form a cylindrical shape, and the outer periphery of the plating 14 in the annular groove 11 is cut to form a crosspiece V-shaped groove. 15 and finally polished and finished, the slip ring assembly 1
Produce 6.

As described above, in the method for manufacturing a slip ring assembly of the present invention, the reinforcing core rod 7 made of Be-Cu, SUS, etc.
Since the support shaft 10 is arranged around the reinforcing core, when the annular groove 11 is later cut into the outer periphery of the support shaft 10, and when a part of the bottom of the annular groove 11 is further cut deeper, the support shaft 10 has a reinforcing core. It is reinforced by the rod 7 and will not break. Furthermore, since centering can be performed using the reinforcing core rod 7 during cutting, highly accurate cutting can be performed. Furthermore, since the lead wires 8 are arranged in advance on the adhesive tape 9 and wound around the outer periphery of the reinforcing core rod 7, the support shaft 10
There is no possibility that the lead wires 8 become entangled with each other inside the lead wire 8, and a highly insulating and highly reliable slip ring assembly can be obtained. Further, since the support shaft 10 is molded with resin into a substantially cylindrical shape without any obstructions, the support shaft 10 without pinholes is formed. Furthermore, as mentioned above, since there is no entanglement between the lead wires 8, it is possible to manufacture even small products by changing the thickness of the reinforcing core rod 7, the thickness of the lead wires 8, and the thickness of their insulation coatings. can.

Next, specific examples and conventional examples of the method for manufacturing a slip ring assembly of the present invention will be described.

〔Example〕

As shown in Fig. 2, a reinforcing core rod 7 is a Be-Cu rod 5 with a diameter of 0.9 mm and an insulating coating 6 made of epoxy resin.
Scrape off 20 mm of the tip of a Teflon insulated wire coated with 5μ of Sn plating, and attach 13 lead wires 8 coated with 15 to 20μ of epoxy resin in a row on the adhesive tape 9 at regular intervals, and then attach them to the adhesive tape 9. The lead wires 8 that are aligned and attached to the reinforcing core rod 7 are attached to the fourth
The lead wire 8 was wound as shown in the figure and fixed to the reinforcing core rod 7 with an instant adhesive, and the adhesive tape 9 was removed. Next, this is put into a mold, one end of the lead wire 8 is guided out of the mold, and the reinforcing core rod 7 is locked at the center, and the mold is filled with epoxy resin and solidified, as shown in Fig. 5. As shown, a cylindrical support shaft 10 was formed. Next, in the longitudinal direction of the outer peripheral surface of this cylindrical support shaft 10, as shown in FIG.
Thirteen annular grooves 11 each having a length of 0.6 mm and a depth of 0.35 mm were formed by grooving. Next, a part of the bottom of this annular groove 11 is deeply cut in an arc shape, and the insulation coating of each lead wire 8 is broken as shown in FIG.
An arc-shaped recess 12 was formed by partially exposing the conductive portion. Next, electroless plating of Cu is performed inside the annular groove 11 to give a Cu plating of 0.5 to 1μ, and the annular groove 11 is
After applying a resist to the bottom of the substrate and performing an etching process, the resist was removed to form an electrode 13 as shown in FIG. Next, as shown in FIG.
Electroplating was performed, and further electroplating 14 of 0.5 mm of 1% Au to Ag was applied to protrude from the outer peripheral surface of the support shaft 10. After that, the outer peripheral surface of the support shaft 10 is cut to form a cylindrical shape with a diameter of 2.3 mm, and the outer periphery of the plating 14 in the annular groove 11 is cut to form a shallow V-shaped groove with a depth of 80 μm. 15, and finally polished to form the 10th
A slip ring assembly 16 as shown in the figure was manufactured.

The slip spring assembly produced in this way
When 100 pieces were tested, none caused insulation deterioration. Also, none of them were broken during production.

[Conventional example]

Slip rings with an inner diameter of 1.8 mm and an outer diameter of 3 mm are made by pressing a plate made of Au-Ag1% with a thickness of 0.6 mm, and then lead wires made of Cu with a diameter of 0.2 mm are attached to the inner circumference of each slip ring. Then, 13 slip rings were arranged and set at 0.4 mm intervals in the mold, and the lead wires of each slip ring were led out of the mold. Next, the mold was filled with epoxy resin and supported. The shaft was molded and a slip ring was integrally formed on the outer circumferential surface.The outer circumference was then cut to form a support shaft with a diameter of 2.3 mm.The surface was polished and finished to form a slip ring assembly. .

The slip spring assembly produced in this way
When 100 pieces were evaluated in the same manner as in the example, 6 pieces were broken during manufacturing (cutting), 63 pieces failed the insulation test, and 3 pieces had pinholes when the appearance of the passed pieces was inspected. There were 28 products that passed the test, and the defective rate was 72%.

As is clear from the above, according to the manufacturing method of the present invention, it is possible to obtain a slip ring assembly with high insulation properties, high strength, and good quality.
Furthermore, there are excellent effects such as the ability to easily obtain a small and lightweight slip ring assembly.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing a conventional slip ring assembly, and FIGS. 2 to 10 are views showing steps of a method for manufacturing a slip ring assembly according to the present invention. 5... Rod, 6... Insulation coating, 7... Reinforcement core rod,
8... Lead wire, 9... Adhesive tape, 10... Support shaft, 11... Annular groove, 12... Arc-shaped recess, 1
3...electrode, 14...electroplating, 15...V-shaped groove, 16...slip ring assembly.

Claims (1)

[Claims] 1 A plurality of lead wires are fixed on the outer circumferential surface of an insulated reinforcing core rod, then set in a mold, one end of each lead wire is led out of the mold, and then resin is poured into the mold. to form a cylindrical support shaft, then form the same number of annular grooves as the lead wires at regular intervals on the outer periphery of the support shaft, and then deep cut a part of the bottom of each environment to form one each. Expose the conductive part of the lead wire, then make a plating electrode at the bottom of the annular groove by electroless plating, sputtering, or applying conductive paint, and then use the plating electrode to inject electricity into the annular groove. A method for producing a slip ring assembly, which comprises plating the support shaft to protrude from the outer circumference thereof, and then cutting and polishing the outer circumference of the support shaft for finishing shaping.