JP2006100231A - Connector for circuit board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce an installation space and a manufacturing cost such as a material cost of a housing or the like, while the dimensions of the housing in its width direction can be shortened and the protruded length of a terminal fitting protruding to the rear from the housing can be also shortened. <P>SOLUTION: Two kinds of terminal fitting 11A, 11B pressed in the upper and lower stages of a housing 20 respectively are provided. Each terminal fitting 11A, 11B is bent in an almost L shape, its one end side connected to a counterpart terminal is formed as a terminal connecting part 12, a narrow circuit board connecting part 13 is formed on the other end side, and a mounting part 16 soldered to a PCB 40 is formed at its lower end. In the upper and lower terminal fittings 11A, 11B, respective circuit board connecting parts 13 are formed by offsetting right and left to the opposite sides with respect to the axial line of the terminal connecting part 12. While mounting the terminal connecting parts 12 of the upper and lower terminal fittings 11A, 11B by straightly arranging them in the vertical direction, the circuit board connecting parts 13 of the terminal fittings 11A, 11B in both stages are disposed by laterally aligning them in a line at the same positions where they protrude to the rear of the housing 20. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a board connector.

Conventionally, what was described in patent document 1 is known as an example of the connector with which a printed circuit board is mounted | worn. This is provided with two types of large and small terminal fittings bent in an L shape, while a plurality of press-fitting holes are arranged in the width direction at equal pitches and formed in two upper and lower stages in the housing. The upper and lower press-fitting holes are aligned straight in the vertical direction. And one end side of the smaller terminal fitting is press-fitted into the lower press-fitting hole and protrudes forward, the other end protrudes rearward of the housing and is directed downward, and one end side of the larger terminal fitting is the upper press-fitting hole The other end of the terminal fitting protrudes to the rear of the housing larger than the small terminal fitting and is directed downward, and the other end of each of the terminal fittings corresponds to the corresponding conductive portion on the circuit board. It is fixed by soldering. Such a board connector has an advantage that the terminal fittings can be mounted with high density in the width direction of the housing, in other words, downsizing in the width direction of the housing can be realized.
JP-A-6-203928

However, in the above type of connector, since the other end sides of the upper and lower terminal fittings are arranged in a state of being arranged in the front and rear in the depth direction at the rear of the housing, the dimension in the depth direction increases when the entire connector is viewed. I hate it.
Therefore, as another example, there is also known a state in which the upper and lower press-fit holes are shifted by a half pitch, that is, provided in a staggered arrangement. In this example, both the upper and lower terminal fittings can be arranged in a horizontal row at the position where the other end protrudes to the rear of the housing by the same dimension, that is, the depth of the connector can be reduced. However, this has a problem of increasing the size in the width direction of the housing, and further improvement has been desired.
The present invention has been completed based on the above circumstances, and an object thereof is to reduce the size of the connector.

  As a means for achieving the above object, in the board connector of the invention of claim 1, a plurality of terminal fittings are arranged in the width direction and in a plurality of stages in the height direction on the housing attached to the circuit board. In the terminal fitting, a terminal connecting portion that protrudes toward the front of the housing on one end side and is connected to a mating terminal is bent toward the circuit board side after protruding toward the rear of the housing on the other end side. Each of the terminal fittings each provided with a board connection portion connected to the circuit board has the board connection portion formed narrower than the terminal connection portion and arranged in the height direction. The stepped terminal fitting is characterized in that the board connecting portion is arranged in different regions among the regions divided by the number of steps in the width direction of the terminal fitting.

The invention according to claim 2 is the one according to claim 1, wherein the terminal fittings are mounted in two upper and lower stages, and in the terminal fittings arranged in the vertical direction, each of the board connection portions is the terminal. It is characterized in that it is formed so as to be offset to opposite sides in the width direction with respect to the axis of the connecting portion.
The invention according to claim 3 is the one according to claim 1 or claim 2, wherein the terminal fitting is mounted by being press-fitted into a press-fitting hole formed in the housing with the terminal connection portion, The step surface between the terminal connection portion and the substrate connection portion is in a posture perpendicular to the axis of the terminal connection portion and is set as a pressing surface at the time of press-fitting.

<Invention of Claim 1>
While the terminal connection parts of the terminal fittings of each stage are mounted so as to be aligned straight in the vertical direction, the board connection parts of the terminal fittings of each stage are located in different areas divided in the width direction of the terminal fittings. In the same protruding position to the rear of the housing, they are arranged side by side. In other words, it is possible to reduce the size of the housing in the width direction and shorten the length of the terminal fitting protruding rearward from the housing, reducing the installation space, the material cost of the housing, etc. The manufacturing cost can be reduced.

<Invention of Claim 2>
While mounting the terminal connection parts in the upper and lower stage terminal fittings straightly in the vertical direction, the board connection parts of both stage terminal fittings are located in regions opposite to each other in the width direction of the terminal fittings, They are arranged side by side in the same protruding position at the rear of the housing.
<Invention of Claim 3>
The terminal connection portion can be efficiently press-fitted into the press-fitting hole of the housing by pressing a pressing surface in a direction orthogonal to the axis. By setting the pressing surface orthogonal to the press-fitting direction, the assembling work by press-fitting the terminal fitting can be performed satisfactorily.

<Embodiment>
An embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the board connector 10 of the present embodiment has a plurality of terminal fittings 11 attached to a housing 20, and the housing 20 is placed on a printed circuit board 40 (hereinafter simply referred to as a PCB 40). The terminal fittings 11 are connected to the PCB 40 by reflow soldering, and the fixing fittings 30 are mounted on both side surfaces of the housing 20. The fixing fittings 30 are also fixed on the PCB 40 by reflow soldering. It has come to be.

  The housing 20 is made of synthetic resin, and as shown in FIGS. 2 to 6, the housing 20 is formed in a horizontally long block shape as a whole, and a female counterpart housing (not shown) is fitted to the front surface thereof. A fitting recess 21 is formed. A plurality of press-fitting holes 24 are formed in the base wall 22 of the housing 20, which is the inner wall of the fitting recess 21, arranged in the width direction and divided into two upper and lower stages. As will be described later, the press-fitting holes 24 are for press-fitting the terminal connection portion 12 of the terminal fitting 11 from the rear, and as shown in FIG. 4, three pieces are provided at both ends in the width direction in the upper stage. On the other hand, 9 pieces are formed at the same pitch over the entire width in the lower stage, and 3 pieces at both ends are formed in a straight line vertically in the upper and lower stages.

As shown in FIGS. 7 and 8, the terminal fitting 11 includes two types of a first terminal fitting 11 </ b> A that is tall and a second terminal fitting 11 </ b> B that is short. In addition, when performing description common to 11A of 1st terminal metal fittings, and the 2nd terminal metal fitting 11B, it demonstrates as the terminal metal fitting 11. FIG.
The terminal fitting 11 basically has a shape obtained by bending an elongated bus bar into a substantially L shape, and one end side of the terminal fitting 11 is connected to a female terminal (not shown) mounted on the mating housing. The other end side is a board connecting part 13 connected to the conductive part on the PCB 40 by soldering. The height of the board connecting part 13 makes the first terminal fitting 11A and the second It is classified into the two-terminal metal fitting 11B.

  Specifically, the terminal connecting portion 12 has a wide tab shape, and is press-fitted into the press-fitting hole 24 of the housing 20 from the rear. As shown in FIG. 10, the inlet 24A of the press-fitting hole 24 is widened, and the upper and lower surfaces are tapered surfaces for guiding. On both side surfaces on the rear end side of the terminal connection portion 12, a press-fit portion 14 having a slightly wider width is formed, and a biting projection 14 </ b> A is provided in the middle. Further, stoppers 15 are provided on both side surfaces on the rear end. Is formed overhanging.

  As shown in FIGS. 7 and 10, the board connecting portion 13 is formed by slightly protruding backward from the rear end surface of the terminal connecting portion 12 and then bent downward at an angle slightly larger than 90 degrees. Yes. Since the terminal fitting 11 is mounted on the surface of the PCB 40 by reflow soldering, the attachment portion 16 is slightly at the lower end of the board connecting portion 13 and is slightly more than 90 degrees toward the rear. It is bent at a large angle.

Here, the board connecting portion 13 is formed to be relatively narrow, such as a little less than half the width of the terminal connecting portion 12 described above.
As shown in FIG. 8, in the first terminal fitting 11 </ b> A, the board connecting portion 13 is located on the rear end surface of the terminal connecting portion 12 from a position offset to the right when viewed from the rear with respect to the axis X of the terminal connecting portion 12. Is formed. That is, it is bent from the position near the right end of the rear end surface of the terminal connecting portion 12 to the rear and then bent downward.
On the other hand, in the 2nd terminal metal fitting 11B, the board | substrate connection part 13 is formed in the rear-end surface of the terminal connection part 12 from the position offset to the left side seeing from the back with respect to the axis line X of the terminal connection part 12. That is, it is bent from the position near the left end of the rear end face of the terminal connecting portion 12 to the rear and then bent downward.

Therefore, as shown in FIG. 9, when the first terminal fitting 11A and the second terminal fitting 11B are arranged in such a posture that the terminal connection portion 12 is aligned vertically, the board of each terminal fitting 11A, 11B. The connection portion 13, that is, the attachment portion 16 at the lower end thereof, is arranged at a predetermined interval on both the left and right sides of the terminal connection portion 12 with the axis X therebetween.
At this time, the interval between the attachment portions 16 of the two terminal fittings 11 is set to be, for example, exactly half of the interval between the attachment portions 16 of the adjacent second terminal fittings 11B.

  In both the terminal fittings 11A and 11B, in the region extending from the portion connected to the rear end face of the terminal connecting portion 12 to the bent portion in the board connecting portion 13, the reinforcing portion 17 is formed to be slightly wider than the lower end side. The rigidity is increased. The reinforcing portion 17 has an outer surface that is flush with the projecting surface of the stopper 15, and an inner surface that is located slightly in front of the axis X of the terminal connection portion 12. Further, the step portion at the lower end of the reinforcing portion 17 is formed in a taper shape for stress relaxation.

  In both the terminal fittings 11A and 11B, on the rear end surface including the stopper 15 of the terminal connection portion 12, a region more than half of the width direction is connected to the axis X of the terminal connection portion 12 without the substrate connection portion 13 being continuously provided. This surface remains as a right-angled surface, and this surface can be used as a pressing surface 18 for applying a jig when the terminal connection portion 12 is press-fitted into the press-fitting hole 24.

Fixing brackets 30 for fixing the housing 20 onto the PCB 40 by soldering are attached to the left and right side surfaces of the housing 20.
The fixture 30 is formed by pressing a metal plate, and includes a main body plate 31 and a mounting plate 32 that is integrally bent at a right angle from the lower edge thereof. In the mounting plate 32, four solder entry holes 33 shown in the figure are formed at regular intervals along the length direction.

On the other hand, mounting grooves 27 for the fixing bracket 30 are formed on the left and right side walls 26 of the housing 20. The rear end portion of the side wall 26 is formed so as to protrude from the rear surface of the housing 20 in order to protect the soldered portion of the terminal fitting 11. The fixing plate 30 has its main body plate 31 press-fitted into the mounting groove 27 from above, and the mounting plate 32 is positioned at a position protruding slightly downward from the lower surface of the housing 20 as shown in FIG. It can be attached in a state.
As shown in FIG. 3, on the lower surface of the housing 20, the portion excluding the side wall 26 is raised to form a concave surface 28, so that a flux escape space 29 can be secured as shown in FIG. It has become.

Subsequently, an example of a process of assembling the board connector 10 and attaching the connector 10 to the PCB 40 will be described.
The terminal fitting 11 is attached to the housing 20. For this purpose, the terminal connection portion 12 of the second terminal fitting 11B is inserted into the lower press-fitting hole 24, and the pressing surface 18 provided in the region on the right side of the rear end surface of the terminal connection portion 12 is a jig or the like. Pressed with. When the terminal connection portion 12 is pushed in, the press-fit portion 14 is pressed into the left and right side walls of the press-fit hole 24, and the push-in is stopped when the stopper 15 hits the inner edge of the inlet 24A (see FIG. 6). .
When the press-fitting of the second terminal fitting 11B is completed, the terminal connection portion 12 of the first terminal fitting 11A is inserted into the upper press-fitting hole 24, and the pressing surface 18 is also pressed by a jig or the like, Pushing is stopped by the stopper 15.

Thereby, in the fitting recessed part 21 of the housing 20, the terminal connection part 12 of the upper and lower terminal metal fittings 11A and 11B protrudes the same length, as shown in FIG. At the same time, the attachment portions 16 of the upper and lower terminal fittings 11 </ b> A and 11 </ b> B in the board connection portion 13 are arranged in a row in the horizontal direction at a position protruding a predetermined dimension behind the housing 20. In particular, at both ends in the width direction, the attachment portions 16 of the first terminal fittings 11A and the second terminal fittings 11B are alternately arranged at a constant pitch in the portion where the terminal fittings 11 are mounted on the upper and lower stages. In addition, as shown in FIG. 10, the attachment part 16 of both the terminal metal fittings 11A and 11B has taken the attitude | position of a little downward.
Further, the fixing bracket 30 is positioned and attached to the mounting grooves 27 of the side walls 26 of the housing 20.

On the other hand, solder is applied in advance to each portion of the PCB 40 where soldering is planned. After that, the connector 10 is placed at a predetermined position on the surface of the PCB 40. At this time, the mounting portion 16 of the terminal fittings 11A and 11B in the board connecting portion 13 is placed on the solder application position, and the mounting plate 32 of the fixing bracket 30 is also placed on the solder application position.
In this state, when the PCB 40 on which the connector 10 is placed is run in a high temperature furnace (not shown), the solder applied in advance to the PCB 40 is melted and adheres to the mounting portions 16 of the terminal fittings 11A and 11B. . In addition to adhering to the peripheral edge of the mounting plate 32 of the fixing bracket 30, it enters the solder entry hole 33 and adheres to its peripheral surface.
When the solder is cooled and solidified, the board connecting portions 13 of the terminal fittings 11A and 11B are fixedly connected to the corresponding conductive paths, and the mounting plate 32 is fixed to the PCB 40, that is, the housing. 20 is attached to the PCB 40 in a slightly floating state.

  In addition, since the bent portion of the board connecting portion 13 in the terminal fitting 11 is a wide reinforcing portion 17 and the bending rigidity is increased, the board connecting portion 13 is bent with high accuracy and eventually the attachment portion 16 at the tip. Is arranged facing the PCB 40 in a normal posture. Therefore, the lower surface of the attachment portion 16 can be pressed over a wide range against the solder applied in advance on the PCB 40, and is securely and firmly fixed.

In the reflow solder as described above, a flux is applied on the solder in order to improve the wettability of the solder and prevent oxidation, but this flux is used when the solder melts. Similarly, it melts and flows down, for example, when it enters the lower surface of the housing 20 and then solidifies, the housing 20 is lifted to peel off the soldered portion on the terminal fitting 11 side or enter the fitting recess 21. Then, when mated with the mating housing, it may adhere between the male and female terminal fittings, leading to poor conduction.
However, in this embodiment, the housing 20 is mounted in a state of being slightly lifted from the PCB 40, and the concave surface 28 is formed on the lower surface of the housing 20, so that a space 29 for releasing the flux is wide between the surface of the PCB 40. Since it is secured, even if the flux flows down, it is accommodated in the escape space 29, and the above-described problems do not occur.

  As described above, according to this embodiment, in the terminal fittings 11 </ b> A and 11 </ b> B arranged side by side, the respective board connection portions 13 are opposite to each other in the width direction with respect to the axis X of the terminal connection portion 12. Since the terminal connection portions 12 of the upper and lower terminal fittings 11A and 11B are mounted so as to be straightly aligned in the vertical direction, the board connection portions 13 of the both stage terminal fittings 11A and 11B are mounted. Are arranged side by side in the same protruding position to the rear of the housing 20 while being located in regions opposite to each other in the width direction of the terminal fitting 11.

As a result, it is possible to reduce the size of the housing 20 in the width direction and shorten the length of the terminal fitting 11 protruding backward from the housing 20, thereby reducing the installation space and the housing. The manufacturing cost such as 20 material costs can be reduced.
In addition, since the pressing surface 18 orthogonal to the press-fitting direction is set using the region where the board connecting portion 13 is not continuously provided in the rear end surface of the terminal connecting portion 12, the assembling work by press-fitting the terminal fitting 11 is performed. It can be done smoothly and efficiently.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.
(1) In the case of forming the substrate connection portion by offsetting, as long as the board connection portion is distributed to the left and right in the upper and lower steps, it is arbitrary whether the substrate connection portion is offset to the left or right by the upper and lower terminal fittings.
(2) The present invention can also be applied to a case where terminal fittings are mounted in three or more stages. In that case, it is only necessary to have a structure in which the board connection portions are arranged in different regions among the regions divided in the width direction of the terminal fittings by the number of steps in the terminal fittings of each step.

(3) The terminal fitting is not limited to the retrofit by press-fitting shown in the above embodiment, and may be integrally attached by insert molding.
(4) In addition, as a means for connecting the terminal fitting to the PCB, a flow type soldering is adopted in which the tip of the board connecting portion is inserted into the through hole of the PCB and is floated in a molten solder bath to be soldered. May be.
(5) As a means for fixing the housing to the PCB, a fastener such as a screw may be used.

The perspective view of the state which attached the connector on PCB which concerns on one Embodiment of this invention Perspective view from the back of the connector Perspective view seen from the bottom Front view Rear view Same part cutaway plan view (A) Perspective view of first terminal fitting, (B) Perspective view of second terminal fitting. (A) Plan view of first terminal fitting, (B) Plan view of second terminal fitting Top view when both terminal fittings are stacked one above the other Longitudinal cross section with connector mounted on PCB

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Board connector 11, 11A, 11B ... Terminal metal fitting 12 ... Terminal connection part 13 ... Board connection part 16 ... Mounting part 18 ... Pressing surface 20 ... Housing 22 ... Base wall 24 ... Press-fit hole 40 ... PCB (circuit board)
X ... Axis (of terminal connection 12)

Claims (3)

A housing attached to the circuit board is provided with a plurality of terminal fittings arranged in the width direction and in a plurality of steps in the height direction, and the terminal fitting projects to the front of the housing on one end side and is connected to a mating terminal. Each having a board connection part that protrudes toward the other end side and is bent toward the circuit board side and connected to the circuit board.
In the terminal fitting, the board connecting portion is formed narrower than the terminal connecting portion, and in each stage of the terminal fitting arranged in the height direction, the board connecting portion has a width in the terminal fitting. A board connector characterized in that the board connector is arranged in different areas among the areas divided in the number of stages.   The terminal fittings are mounted in two upper and lower stages, and in the terminal fittings arranged vertically, the board connection portions are offset to the opposite sides in the width direction with respect to the axis of the terminal connection portion. The board connector according to claim 1, wherein the board connector is formed.   The terminal fitting is mounted by pressing the terminal connection portion into a press-fitting hole formed in the housing, and a stepped surface between the terminal connection portion and the substrate connection portion is the terminal connection portion. The board connector according to claim 1, wherein the board connector is set as a pressing surface during press-fitting.

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