JP2829729B2 - Manufacturing method of multi-core contact bus - Google Patents

Description

Description: TECHNICAL FIELD [0001] The present invention relates to a method for manufacturing a multi-conductor bus for connecting a DC electronic device such as an electron microscope and a DC power supply thereof.

[Technical Background of the Invention and Its Problems] Generally, the multi-core connecting bus is configured as shown in FIGS. 2A to 2C. FIG. 2B is an external view of the entirety. In this figure, a power supply and tapered portions 2 to be inserted into the equipment main body are provided at both ends of the cylindrical body 1, and FIG. Are provided respectively. The electrode parts are insulating parts 4a to 4
It has an insulating cylinder 4 made of 4c, and a plurality of axially inner electrode plates 5b and outer electrode plates 5c in the inner direction distributed and embedded in the surface of the insulating portions 4b and 4c. Further, a concentric center electrode 5a is provided on the end surface of the minimum diameter insulating portion 4a at the tip of the insulating cylinder 4. A plurality of insulated lead wires are provided in the cylindrical body 1, and each conductor of these insulated lead wires is connected to the inner peripheral electrode plate.
5b and the outer peripheral electrode plate 5c are electrically connected to each other.

Conventionally, the following method was used to manufacture the multi-core communication bus having the above configuration.

First, as the most common method, the electrode portion 3 having the insulating lead wires attached to the inner peripheral electrode plate 5b and the outer peripheral electrode plate 5c is set in a mold, and epoxy resin is injected into a gap in the mold and molded. Processing methods are known. However, according to this method, it is very difficult to fix each electrode plate at a predetermined position during casting. In addition, it is inevitable that the epoxy resin wraps around the surface of each electrode plate, and a finishing operation for removing the epoxy resin is required, which is not efficient. Further, it is extremely difficult to shield the inner electrode and the outer electrode.

As the next best measure, cast the inner conductor into the center conductor up to the diameter of the inner electrode, cut it out, form a groove for mounting the inner electrode, attach the inner electrode, and then pour it to the outer electrode mounting diameter. In some cases, the outer peripheral electrode is mounted in the same manner as described above.
However, according to this method, the inner peripheral electrode,
The shielding process between the outer electrodes is relatively easy, but it requires two cutting operations, which not only takes a long time, but also tends to reduce the dimensional accuracy for small-diameter and long ones. There were drawbacks.

Further, since the distance between the electrodes is narrow in both cases, there is a possibility that the resin does not completely turn around at the time of the integral casting, and voids may occur between the electrode plates to lower the insulation between the electrodes.

The present invention has been made based on the above circumstances, and a power supply,
Even if the equipment body requires a large number of electrodes, it is possible to easily fix the electrode plates at the time of casting and to obtain good insulation between the electrode plates, and also to manufacture multi-core busbars. The aim is to get the law.

[Summary of the Invention] In the method for manufacturing a multi-conductor bus according to the present invention, an inner insulating cylinder having a plurality of inner peripheral electrodes on its peripheral surface is assembled on the outer periphery of an end of a center conductor. An outer insulating cylinder is attached to the outer periphery of the inner insulating cylinder so that its front end is located on the non-front end side of the inner insulating cylinder in an axial direction, and then these center conductors, the inner insulating cylinder, and the outer insulating cylinder are fixed. The center conductor, the inner insulating tube, and the outer insulating tube are integrally molded by being housed in a mold held at the position, and injecting a synthetic resin into a gap in the mold.

In the manufacturing method of the present invention, an inner insulating cylinder and an outer insulating cylinder for supporting the electrode plate of the electrode portion, which are difficult to accurately arrange the electrode plate in the conventional integral molding, are separately formed, and these are mainly formed. Since it is assembled with the conductor and integrally molded by injecting a synthetic resin, it is possible to obtain a high quality multi-core connecting bus.

[Embodiment of the Invention] In the present invention, a kind of prefabricated construction method is adopted. That is, the center electrode 5a is embedded in the end face, and the inner peripheral electrode plate is
5b is distributed in the circumferential direction and buried in the inner insulating portion 4a, and the outer electrode plate 5c is also distributed in the circumferential direction and buried in the outer insulating portion 4c.
Are manufactured separately. At this time, the inner diameter of the insulating part 4c is almost equal to the outer diameter of the inner insulating part 4a, and the outer insulating part 4c
Has an outer diameter substantially equal to the diameter of the opening provided at the end of the tapered portion 2. Further, each of the insulating portions has an electrode plate 5b, 5c.
Are processed and installed.

In the manufacturing method of the present invention, as shown in FIG. 1, a corresponding electrode plate with an insulating lead wire 7 is inserted into the electrode plate embedding portion of each of the insulating portions 4a to 4c previously manufactured as described above. 5b-5c
Are embedded in the mold and mounted on the center conductor 6 in order from the inner peripheral insulating portion, and are housed in a mold having a relatively simple structure that regulates the positions of the insulating portions 4a to 4c. A synthetic resin 8 such as an epoxy resin is injected between the insulating part 4a and the external insulating part 4c. In FIG. 1, 9 is a copper braid and semiconductive layer provided on the outer periphery of the lead wire 7, 10 is an insulator provided on the outer periphery of the center conductor 6 and the outer periphery of the row of the lead wires 7, and 11 is an electrode embedding. A pipe 12 indicates a heat-shrinkable tube provided on the outer periphery of the center conductor.

In the above manufacturing method of the present invention, the inner insulating portion 4a in which the electrode plates are arranged and the outer insulating portion 4c are separately formed by a prefabricated method, and the inner insulating tube and the outer insulating tube are attached to the outer periphery of the end of the center conductor. Since these are molded integrally with synthetic resin, compared to the conventional manufacturing method in which each electrode plate is arranged in a mold and the inner insulating cylinder and the outer insulating cylinder are integrally molded,
The position of each electrode plate can be accurately determined, and the mold may have a simple structure. Further, the number of man-hours can be remarkably reduced as compared with the conventional manufacturing method of manufacturing by casting and cutting in two stages.

[Effects of the Invention] As is clear from the above, in the method for manufacturing a multi-core interconnecting bus of the present invention, even if the method includes a large number of electrode plates, each electrode plate can be formed without a complicated mold. The position can be accurately determined, and a high quality multi-conductor bus can be provided at relatively low cost.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a multi-fiber communication bus for explaining the manufacturing method of the present invention, FIG. 2B is a front view of the multi-fiber communication bus, and FIG.
FIG. 2 is an enlarged perspective view of the electrode portion, and FIG. 2C is a longitudinal sectional view thereof. 1... Contact bus, 2... Taper part, 3... Electrode part, 4a-
4c: insulating part, 5a to 5c: electrode plate, 6: central conductor, 8
…… Synthetic resin

Claims (1)

(57) [Claims] 1. An inner insulating cylinder having a plurality of inner electrodes on its peripheral surface is attached to an outer periphery of an end portion of a center conductor. The outer insulating cylinder is assembled by being shifted in the axial direction so as to be located on the non-tip side of the inner insulating cylinder, and then these center conductors, the inner insulating cylinder and the outer insulating cylinder are housed in a mold that holds them at predetermined positions. A method of manufacturing the multi-conductor bus, wherein the center conductor, the inner insulating tube and the outer insulating tube are integrally molded by injecting a synthetic resin into a gap in the mold.