JP2002095129A - Multiconductor cable termination method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multiconductor cable termination method which has excellent productivity and can connect the cable easily. SOLUTION: In order to connect center conductors of a plurality of extra-thin insulated conductors or extra-thin coaxial cables to a connection part formed on a board, etc., with connection material such as solder, etc., the center conductors are arranged and aligned with the connection part by a grooved heat ray transmitting member with grooves for wire arrangement and, after the center conductors are arranged and fixed by a pressure, heat rays are supplied through grooved heat ray transmitting member. With such a constitution, the center conductors can be connected collectively, so that the excellent productivity can be obtained and the connection works can be easy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a multi-core cable provided with a plurality of ultra-fine insulated core wires or micro-coaxial cables connected to, for example, cable connection pads of a substrate arranged at a narrow pitch. The present invention relates to a multi-core cable terminal processing method for processing multi-core cable terminals.

[0002]

2. Description of the Related Art Recently, insulated core wires or coaxial cables used in measuring devices, communication devices, medical probe cables or robot micromachines, etc., have been adapted to miniaturization and higher performance of these devices. Therefore, an extremely thin outer diameter is required.

[0003] In response to the above requirements, for example, the outer diameter of a coaxial cable is 0.25 mm or 0.1 mm.
An extra-fine coaxial cable having an extremely small outer diameter of 6 mm is manufactured.
Multi-core cables formed by twisting are in practical use.

When such a multi-core cable is connected to, for example, a cable connection pad of a printed circuit board arranged at an extremely narrow pitch, the center conductor of each micro coaxial cable is extremely thin, The connection work requires fine and accurate processing, is very difficult, and places a heavy burden on the connection worker.

For example, specifically, when the center conductor of the micro coaxial cable in the above-described multi-core cable is connected to a pad as a connecting portion on a printed circuit board arranged at a very narrow pitch, each of the very thin The center conductor is manually aligned with a corresponding pad using a microscope or the like to perform fine and accurate processing, and connected using solder or the like.

[0006] Such a connection operation requires skill and is very difficult, imposes a heavy burden on the connection operator, and has a limit in terms of improving productivity.

[0007]

Accordingly, the present invention provides
It is made in view of the above-mentioned point, and the purpose is to make each ultra-fine insulated core wire or each ultra-fine wire of a multi-core cable having a plurality of ultra-fine insulated core wires or micro-coaxial cables (hereinafter, these may be referred to as extra-fine cables). When connecting the center conductor of a coaxial cable to a connection portion arranged at a narrow pitch, it is excellent in productivity and can be easily connected. Is to provide.

[0008]

The above object is achieved by a multi-core cable terminal processing method according to the present invention. That is, the present invention provides a step of preparing a multi-core cable including a plurality of extra-fine cables to be connected, a step of exposing a conductor by peeling an insulator at a terminal portion of the plurality of extra-fine cables, and Preparing a connected member having a connection portion to be connected, applying a joining member for joining the exposed conductor and the connection portion to the exposed conductor and / or the connection portion, A step of aligning and aligning the exposed conductor with the connecting portion to be connected and pressing and fixing the exposed conductor at the position by using a grooved heat transmitting member having a groove for accommodating and guiding the heat transmitting member; And bonding the exposed conductor pressed and fixed to the connection part to be connected by the heat by the heat, and joining the exposed conductor with the joining member. It is a Bull terminal processing method.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on one embodiment with reference to the accompanying drawings. In FIG. 1, a multi-core cable 1 includes a plurality of micro coaxial cables 2 to be connected,
This micro coaxial cable 2 has a center conductor 3 having an outer diameter of 0.09 mm covered with an insulator 4 having a thickness of 0.08 mm.
Is provided with a horizontal winding shield (not shown) in which 21 conductors having an outer diameter of 0.04 mm are wound on the outer periphery of the outer periphery, and a jacket (not shown) is further provided on the outer periphery thereof to have an outer diameter of 0.37 mm. It is. In the terminal portion of the multi-core cable 1, the micro coaxial cables 2 of the multi-core cable 1 are arranged side by side at a narrow pitch of about 0.5 mm in a plane.
The jacket of each micro coaxial cable 2 is stripped by a predetermined length, and the exposed horizontal shields are collectively connected to, for example, a ground portion. On the substrate 5 to which the micro coaxial cable 2 is to be connected, a cable connection pad 6 as a connection portion with the center conductor 3 of the micro coaxial cable 2 is provided with a cable connecting pad 6 of about 0 in accordance with the arrangement pitch of the micro coaxial cable 2. It is provided at a pitch of 0.5 mm.

A multi-core cable terminal processing method according to the present invention for processing the terminal of the micro coaxial cable 2 of the multi-core cable 1 and connecting it to the substrate 5 will be described below. First, the insulator 4 of each micro coaxial cable 2 of the multi-core cable 1 is stripped by a predetermined length at a terminal portion of the multi-core cable 1, and the exposed center conductor 3 is subjected to, for example, preliminary soldering as a joining member. Next, preliminary solder is applied to the pad 6 provided on the substrate 5 as a joining member, the tip of the center conductor 3 is arranged at the center of the pad 6, and a flux is applied from above. Next, a transparent glass grooved heat ray transmitting member 7 provided with comb-shaped alignment grooves 8 corresponding to the narrow pitch interval of each micro coaxial cable 2 is used to form a central portion of the pad 6. The grooved heat ray transmitting member 7 is applied to the center conductor 3 and the center conductor 3 is attached to the pad 6 so that the arranged center conductor 3 is accommodated and guided in the alignment groove 8 of the grooved heat ray transmitting member 7.
Align and align the top and press and fix. At this time, since the grooved heat ray transmitting member 7 is transparent, when the center conductor 3 is not properly aligned by viewing from the upper surface of the grooved heat ray transmitting member 7, the center conductor 3 is aligned and aligned. Can be corrected (see FIG. 2). In addition,
As shown in FIG. 4, the grooved heat ray transmitting member 7 has
The center conductor 3 is accommodated in the straightening groove 8 by rounding the corner 8a of the grooved portion or by widening the width 8b at both ends of the straightening groove 8 as shown in FIG. It can be easier.

Next, with the center conductor 3 pressed and fixed on the pad 6 in this manner, using a heating device 9 (trade name: HEAT BEAM, manufactured by Hibeck Co., Ltd.) utilizing near-infrared rays as a heat ray or heat, The heating wire 10 is supplied to the portion to be joined from the upper surface of the grooved heat ray transmitting member 7 and heated.

As a result, the solder applied to the center conductor 3 and the pad 6 is melted, and the center conductor 3 and the pad 6 provided on the substrate 5 are connected by the solder (see FIG. 3).

As described above, the plurality of center conductors 3 are aligned with the pads 6 provided on the substrate 5 by the grooved heat ray transmitting member 7 having transparency to the heat rays, and the wires are aligned. By pressing and fixing, and supplying heat rays such as near infrared rays through the grooved heat ray transmitting member 7, a plurality of center conductors 3 can be connected to the pads 6 at a time, so that workability is greatly improved. This has the effect of improving the overall performance. For example, in the multi-core cable 1 having 26 micro coaxial cables, the distal ends of the 26 central conductors 3 of the micro coaxial cable are arranged at the center of the pad 6, and then all 26 central conductors 3 are joined to each other. According to the multi-core cable terminal processing method according to the present invention, in the case where the respective center conductors 3 are manually connected by using a soldering iron or the like during the connection work time until the connection to the pads 6 is performed, Connection work time was greatly reduced.

Further, by providing the lens portion 11 on the upper surface of the grooved heat ray transmitting member 7 as shown in FIG. 6, it is possible to concentrate the heat rays 10 on the portion where the center conductor 3 is accommodated, thereby increasing the irradiation efficiency. It is. In addition, in the embodiment of the present invention, the grooved heat ray transmitting member 7 is permeable to heat rays, and any material other than the glass of the above-described embodiment can be used as long as the member has excellent heat resistance. In addition, changes within the technical concept of the present invention are of course possible.

[0015]

As described above, according to the multi-core cable terminal processing method of the present invention, a plurality of ultra-fine insulated core wires or the center conductor of a micro-coaxial cable are soldered to a connection portion provided on a substrate or the like. When joining using the joining member of the above, the central conductor is arranged in accordance with the connecting portion by a grooved heat ray transmitting member having a groove for line alignment, aligned, pressed and fixed, and then passed through the grooved transparent member. Since a hot wire is supplied to the substrate and joining can be performed at a time, productivity is excellent and connection can be easily performed.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a multi-core cable, a board, and a grooved heat ray transmitting member in a multi-core cable terminal processing according to the present invention.

FIG. 2 is an explanatory view illustrating that a center conductor of each of the ultrafine cables of the multi-core cable according to the present invention is arranged at a central portion of a cable connection pad on a substrate and pressed and fixed by a grooved heat ray transmitting member.

FIG. 3 is an explanatory diagram when a hot wire is supplied via a grooved hot-wire transmitting member used for a cable terminal treatment according to the present invention.

FIG. 4 is a sectional view showing an example of a grooved heat ray transmitting member according to the present invention.

FIG. 5 is a front view showing another example of the grooved heat ray transmitting member in the present invention.

FIG. 6 is a sectional view showing still another example of the grooved heat ray transmitting member according to the present invention.

[Explanation of symbols]

1: Multi-core cable, 2: Micro coaxial cable, 3: Central conductor, 4: Insulator 5: Substrate, 6: Pad 7: Heat ray transmitting member with groove, 8, 8a, 8b: Alignment groove, 9:
Heating device 10: hot wire, 11: lens section

Claims (1)

[Claims] 1. A step of preparing a multi-core cable including a plurality of extra-fine cables to be connected; a step of exposing a conductor by peeling an insulator at a terminal portion of the plurality of extra-fine cables; Preparing a connected member having a connection portion to be connected, applying a joining member for joining the exposed conductor and the connection portion to the exposed conductor and / or the connection portion, By the grooved heat permeable member having a groove for accommodating and guiding, the exposed conductor,
A step of aligning and aligning the connecting portion to be connected, and pressing and fixing the position, and supplying heat through the heat permeable member to press the connecting portion to be connected. Joining the fixed exposed conductor with the joining member that is melted and joined by the heat.