JPH0419986A - Manufacture of pin connector for mounting on printed wiring board - Google Patents

Abstract

PURPOSE:To prevent the outer periphery of each contact pin from being shaven during the process of press-fit by initially pressing and plating each contact pin in a molded resin plate which does not contain glass fiber, and using the plate to form box housing from a molding resin material containing glass fiber by means of insert molding so as to form pin connectors. CONSTITUTION:Rectilinear contact pins 1a, 1b, 1c, 1d are pressed into the respective small holes 3a, 3b, 3c, 3d of a flat insulator 2 not containing glass fiber to as far as fixed size at almost the center of each contact pin. Next the flat insulator 2 into which each contact pin has already been pressed is put in an insert molding die and the side wall portion 6 and bottom face portion 7 of box housing 5 are formed from a molding resin containing glass fiber at every required number of connector pins. A line of serial connector pins are thus formed on the tape-shaped flat insulator 2 and then the connecting portion 4 of the tape-shaped insulator 2 is cut at a predetermined position whereby independent pin connectors are completed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method of manufacturing a pin connector for attaching a printed circuit board, which is used for attaching to a printed circuit board of an electronic device or the like.

BACKGROUND OF THE INVENTION First, a conventional method for manufacturing a pin connector for mounting on a printed circuit board will be described with reference to FIGS. 4 and 5. In Fig. 4, numeral 5 designates a box-shaped housing that has been roughly caulked, and small holes 8 are provided at a predetermined pitch on the bottom surface of the housing.
Straight contact pin 1a for a, 8b, 8c8d
, 1blc, and ld are press-implanted to form a pin connector (FIG. 5). The upper portions 9a, 9b9c, 9d of the contact pins protruding into the housing 5 become connection parts with the connector socket side, and the lower portions 10a, 10 of the contact pins protruding into the lower part of the housing 5.
b, 10c, and 10d serve as legs for connection to the printed circuit board 11.

Here, contact pin la, 1. b, lc ld outer diameter and bottom small hole 8 a, 8 b, 8 of housing 5
The inner diameter of c8d is fitted and connected with a slight difference in press fit dimensions.

The problem to be solved by the invention and this pin connector for mounting on a printed circuit board are as follows:
As shown in the figure, the lower parts 10a, 10b, 10 of each contact pin la, lb, lc, ld are attached to the printed circuit board 11.
Solder c, 10d and 12a 12b, 12c,
12d, but in this state, if there is a difference in dimensional variation due to temperature changes between the connector housing 5 and the printed circuit board 11, the lower part 10 of the contact pin
a 10b, 10c, 10d and soldering are part 12
A, 12b, 12c, and 12d are strained, causing problems such as deformation and breakage.

Therefore, in order to bring the coefficient of thermal expansion of the connector housing 5 close to that of the printed circuit board 11, molded resin containing glass fiber is generally used as the material for the connector housing 5.

However, according to the conventional pin connector forming technology mentioned above,
Bottom small holes 8a, 8b, 8c of housing 5.

When press-fitting the contact pins la, lb, lc, and ld into the 8d (especially for small substitutes), it is difficult to press-fit the contact pins from the inside of the housing, so they must be press-fitted from the outside of the housing.) , contact pin la
, lb, lc, ld insertion part outer periphery or small holes 8a, 8b, 8
c and 8d, and the outer periphery of the contact pin is scraped by the glass fibers contained in the molded resin of the housing 5, causing peeling of the plating and roughening of the surface, and the joint part with the socket side connector. There was a problem that contact instability was caused by deterioration of the contact and environmental deterioration during long-term use.

The present invention solves these problems, and does not cause deformation or breakage even under temperature changes, and prevents the outer periphery of the contact pin from being scraped by the glass fibers in the housing molding resin, which can cause problems. The purpose of this invention is to provide a method of manufacturing a pin connector for mounting on a printed circuit board that is superior to the conventional method.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention press-embeds pre-warmed contact pins into a molded resin plate that does not contain glass fibers, and uses this to mold glass fibers by insert molding. The pin connector is formed by forming a box-shaped hole using a resin material.

According to the present invention, contact pins are press-fitted into holes in a molded resin plate that does not contain glass fibers, so the outer periphery of the contact pins is hardly scraped during press-fitting.
Furthermore, since the entire connector including the bottom surface is surrounded by a glass fiber-containing molded resin housing having a linear expansion coefficient similar to that of the printed circuit board constituent material, distortion due to temperature changes after the printed circuit board is attached is unlikely to occur.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

1 to 3 show an embodiment of the method for manufacturing a pin connector for mounting on a printed circuit board according to the present invention. In FIG. 2 is a straight contact pin, and 2 is a tape-like continuous flat insulator made of molded resin that does not contain glass fiber, and the contact pin la is located approximately in the center of the insulator.
The small holes 3a, 3b, 3c, and 3d are opened with a certain pinch so that the small holes 3a, 3b, 3c, and 3d can be lightly press-fitted.

Then, the contact pins la, lb, lc, and ld are press-fitted into the small holes 3a, 3b, 3c, and 3d of the flat plate insulator 2 to a certain size approximately in the middle of the contact pins, as shown in FIG.

Next, as shown in FIG. 3, the flat plate insulator 2 with the contact pins press-fitted therein is installed in an insert mold, and the side wall portion 6 and bottom portion 7 of the box-shaped housing 5 are inserted into the side wall portion 6 and the bottom portion 7 of the box-shaped housing 5 for each required number of connector bins. is made of molded resin containing glass fiber.

Once a series of connector pin rows are formed on the tape-shaped flat insulator 2 in this way, individual pin connectors are completed by cutting the joints 4 of the tape-shaped insulator 2 at predetermined positions. do.

Effects of the Invention As is clear from the above examples, the present invention has the following effects.

(1) Since the flat insulator into which the contact pin is press-fitted is made of resin that does not contain glass fiber, the outer periphery of the contact pin is hardly scraped during press-fitting.

(2) Since the entire connector is surrounded by a molded resin housing containing glass fiber, the coefficient of thermal expansion is similar to that of the printed circuit board material, and distortion due to temperature changes after the printed circuit board is attached is unlikely to occur.

(3) Since the contact pin is inserted and fixed in the glass fiber-containing resin on the bottom of the housing, there is no possibility of solder flux entering the inside of the connector when the bottom of the contact pin is soldered to the printed circuit board. Very few compared to conventional ones.

(4) Since contact pins are press-fitted into tape-shaped flat insulators and then insert molded, continuous molding is easier and less likely to cause defects compared to insert molding of contact pins individually. The possibility is also very small.

[Brief explanation of the drawing]

Figures 1 to 3 are diagrams for explaining the manufacturing method of the pin connector for mounting on a printed circuit board according to the present invention. Figure 1 is a perspective view of the contact pin and flat plate insulator before press fitting, and Figure 2 is a flat plate insulator. Figure 3 is a front view after press-fitting the contact pin into the insulator, Figure 3 is a perspective view of the insert molded state after the contact pin is press-fitted into the flat plate insulator, Figures 4 and 5 are views showing a conventional connector. , Figure 4 is a perspective view before assembly, Figure 5
The figure is a front view after assembly, and FIG. 6 is a partially sectional front view after the connector has been mounted and soldered on a printed circuit board. la, lb, lc, ld...contact pin,
2... Flat plate insulator, 3a, 3b, 3c, 3d.
...Small hole in the flat plate insulator, 4...Connection part (cutting point) of the flat plate insulator, 5...Box-shaped housing, 6... Side wall part, 7...
・Bottom part of the housing. Name of agent: Patent attorney Shigetaka Awano (No. 18) Figure 1m, 1, It, Itt Contact pin 2
Bidan A! 414 ridges 1 housing 4! Ikuri Housing゛eJi surface diagram〃a Scrap/17. - ad

Claims (1)

[Claims] Linear contact pins are press-fitted at a constant pitch to the middle of a tape-like continuous flat insulator made of resin that does not contain glass fibers, and glass fiber-containing resin is inserted into this for each predetermined number of connector pins. After forming a row of box-shaped housings consisting of an outer peripheral side wall and a bottom surface in contact with the flat plate insulator, and making the upper and lower parts of the contact pins protrude inside and below the housing, the flat plate insulator is molded. A method of manufacturing a pin connector for mounting on a printed circuit board, in which the connecting part of the pin connector is cut and separated into individual pin connectors.