JP2537631Y2 - Printed circuit board edge connectors - Google Patents

Description

[Detailed description of the invention]

[0001]

[Industrial application] This invention is applied to the edge of a printed circuit board.
More specifically, the present invention relates to a connector for connecting a plurality of conductive terminals arranged along an edge of a printed circuit board or other panel-shaped circuit device to terminals of circuit components on another substrate. .

[0002]

2. Description of the Related Art Edge connectors for electrically connecting a plurality of conductor terminals arranged along both sides of an edge of a printed circuit board to circuit components on another substrate are generally known. .

In this type of edge connector, when a terminal of a printed circuit board is inserted into the connector, the force required for the insertion is as small as possible.
It is desirable that the force.

Further, in general, the thickness of a printed circuit board is not always constant, so that the terminals arranged on both sides of the edge of the printed circuit board need to reliably contact the contacts of the connector regardless of the variation. There is.

Further, since the printed circuit board is generally a very thin synthetic resin plate, when the printed circuit board is connected to a connector and used, stress such as bending of the plate is not generated.
Door is important.

[0006] Many proposals have hitherto been made to satisfy such requirements. For example, JP-A-60-23
No. 0,378 discloses a low insertion force electrical connector. The connector includes a housing provided with an elongated cavity for receiving an insertion edge of the printed circuit board, wherein a spring contact is provided in the cavity to contact a conductive strip disposed along the edge of the printed circuit board. Installed. Further, the housing is formed as an inwardly projecting shoulder on one side of the cavity as a fixed limit associated with each spring contact, and the printed circuit board inserted into the cavity. It is configured to make direct physical contact with the insertion edge.

[0007] Conventionally, such a printed circuit board connector, including the one described in the above-mentioned patent application publication, is provided with a conductive strip on one surface provided along an edge of the printed circuit board. And an electrical contact with an elastic contact provided on the connector.

In particular, the low insertion force electrical connector disclosed in the above publication has an elongated cavity for inserting a printed circuit board in an elongated housing of the connector, and the cavity has a pair of first and second spaced apart cavities. A plurality of integral spring contacts with a second contact portion are provided. These spring contacts hold the printed circuit board inserted into the cavity with relatively high contact forces from both sides.

[0009] However, even though each spring contact described in the above publication can contact both sides of the printed circuit board, the first and second contact portions of the integral structure are eventually connected to one of the printed circuit boards. Only electrical contact can be made with the surface conductive strip.

In the case where the two contact portions of the integrated structure are electrically insulated from each other so as to make electrical contact with the respective conductive strips provided on both sides of the printed circuit board. The structure makes it impossible to hold the printed circuit board from both sides with a relatively high contact force.

Therefore, in order to hold both sides of the inserted printed circuit board with a relatively high contact force by a spring contact having a structure in which the first and second contact portions are insulated, it is necessary to use the first contact portion and the first contact portion. The second contact portion and the second contact portion must be properly held separately in the housing of the connector, and it is necessary to have a sufficient spring property.

Further, in the spring contact described in the above publication, when the printed circuit board to be inserted warps, the contact force applied to one contact increases, and the contact force applied to the other contact weakens, and the printed circuit board is printed. Both sides of the circuit board cannot be held with uniform contact force. Further, in manufacturing this spring contact, there are many disadvantages such as a large punching pitch as a contact, uneconomical material removal, and the inability to collectively assemble the housing.

[0013]

SUMMARY OF THE INVENTION In view of the above-mentioned many problems in the prior art, the printed circuit board edge connector of the present invention has a recess for inserting the printed circuit board edge into its housing. The side wall in front of the recess is an inclined wall portion inclined forward by a predetermined angle with respect to a vertical axis passing through the center of the recess, and the rear side wall is an upright wall portion parallel to the vertical axis. It is. In order to arrange the contacts of a plurality of connectors having the same structure on the front and rear side walls close to the edge of the printed circuit board and at regular intervals so as to coincide with the terminals provided on the surface of the printed circuit board, a contact housing is provided. A cavity is formed, and the level of the spring contact of the contact mounted on the contact receiving cavity on the front inclined wall portion is located below the level of the spring contact of the contact mounted on the contact receiving cavity on the rear upright wall portion. And when the printed circuit board is inserted into the recess of the housing along the front inclined wall portion, without adding a resistance to the corresponding surface of the printed circuit board into which the spring contact portion of each contact is almost inserted, The so-called Zero Insertion Four
It is to perform the scan.

Next, the printed circuit board, which is inserted into the recess of the connector housing in an inclined state, is rotated toward the rear upright wall portion so as to be in the upright position. Then, the front surface and the rear surface on the inserted edge side of the printed circuit board press the spring contact portions of the contacts mounted in the front receiving space and the contact spring contacts of the contacts mounted in the rear receiving space, respectively. .

In particular, in the present invention, as described later, the contact is formed by a hair pin-shaped holding portion and a V-shaped contact.
And a holding portion and a V-shaped portion.
Since the reaction force against the contact force applied to the contact is increased by the cooperative action with the letter-shaped portion, the printed circuit board to be inserted is warped, and the displacement amount of the contact spring contact portion is reduced. When the predetermined value is exceeded, the reaction force of the contact portion is increased, thereby acting to correct the warped printed circuit board.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, the edge connector of the printed circuit board of the present invention is an elongated housing 10 made of an insulator.
The printed circuit board 12 is inserted into the housing. The printed circuit board 12 is of a type in which a plurality of terminals 14 are arranged at a constant pitch on both sides along its edge.

The elongated housing 10 is provided along its longitudinal axis with a recess 16 which is open at the top to insert the edge of the printed circuit board 12 on which the terminals 14 are arranged. The recess 16 has a front inclined wall portion 18, a rear upright wall portion 20, a front upright wall portion 22 continuing below the front inclined surface portion 18, a lower end of the rear upright wall portion 20, and a lower end of the front upright wall portion 22. And a flat bottom wall portion 24 connecting them.

The front inclined wall portion 1 of the housing 10
8 and the upper end of the rear upright wall portion 20 are both flat top surfaces 26 and 28, and a top surface 28 behind the front top surface 26.
Is at a higher level so that the printed circuit board 12 can be easily inserted into the recess 16 along the front sloped surface 18. Further, the front inclined wall portion 18 has a front vertical side wall 22 extending vertically below the front inclined wall portion 18,
The width of the base of the recess 16 formed with the rear upright wall 20 is
The printed circuit board 12 inserted into the recess 16 can be inserted until the printed circuit board 12 comes into contact with the bottom wall portion 24.
Are sufficiently dimensioned to pivot to an upright position as described below.

The front inclined surface portion 18 and the rear upright wall portion 20 of the housing 10 extend in a direction perpendicular to the longitudinal axis of the housing, are formed at the same pitch as the terminals 14 of the printed circuit board 12, and A front cavity 36 and a rear cavity 38 having openings 32 and 34 passing through the bottom wall 30.
Are formed respectively. These vacancies 36 and 38
Accommodates the contacts 40 of the connector having the same structure.

The contacts 40 of the connector are all of the same structure, and are punched and pressed from an elastic thin metal plate.
As shown in FIG. 2, the intermediate portion of the straight leg portion 44 is bent at the vertex a to form a hair pin-shaped holding portion 46, a downward extending portion 48 extending downward in parallel with the hair pin retaining portion 46, and a lower end b thereof. The spring contact portion 50 is bent upward in a V-shape, and its tip is formed in an arc to project outward. When the spring contact portion 50 is pushed by the insertion of the printed circuit board 12, the back surface c of the lower end b of the downward extension portion 48 contacts the holding portion 46 and acts on the spring contact portion 50 as described later. I have to do it.

The contact 40 is opened in the bottom wall 30 of the housing 10 while the leg 44 is kept straight.
2 and 34, one of the hair pin-shaped holding portions 46 is mounted so as to be in contact with the side surfaces of the respective cavities 36 and 38, and the spring contact portion 48 is exposed in the recess 16. . As a result, the spring contact portions 50 of the contacts 40 accommodated in the front space 36 occupy a lower position than the spring contact portions 50 of the contacts 40 accommodated in the rear space 38, and the spring contact portions 50 are respectively located in the recesses 16. Occupies a protruding position.

In addition, upright posts 52 are integrally formed at both ends in the longitudinal direction of the housing 10, and the printed circuit board 12 is formed along the front inclined wall portion 18 of the housing 10 to form the recess 16. Until the terminal 14 of the printed circuit board 12 comes into full contact with the contact 40 of the connector. It is designed to hold the edge. As the holding means, a conventionally known technique can be applied, and since it does not particularly correspond to a main part of the present invention, a detailed description thereof will be omitted.

The housing 10 of the connector is fixed to the surface of another substrate 60, and the recess 16
The terminal of the printed circuit board 12 inserted into the other substrate 60 is connected via a contact 40 to a terminal (not shown) of a circuit component of the other substrate 60. Therefore, in order to fix the housing 10 to the surface of the other substrate 60, one end is fixed to both ends in the longitudinal direction of the housing 10, and the fixing leg member 62 having the other end protruding downward is attached to the corresponding portion of the substrate 60. This is carried out by fitting it into an opening (not shown) provided in the device.

In order to connect the connector contacts 40 to the terminals of the circuit components on the board 60, the contacts 40 are accommodated in the cavities 36, 38 of the housing 10 and the openings 32, 3 in the bottom wall 30 thereof.
4 are bent outwardly at right angles along the housing 10, and if necessary, the extra length is cut off, and the ends are soldered to the corresponding terminals of the substrate 60. It is performed by bonding with appropriate means such as attaching.

[0025]

[Function and effect of the invention] From the details described above,
As can be readily appreciated, in accordance with the present invention, the printed circuit board 12 is inserted into the housing recess 16 along the forward sloping sidewall 18 of the connector housing 10.
In inserting the recess, the width of the recess 16 is set to a size capable of receiving the printed circuit board 12 with a sufficient margin, and the spring contact portion 50 of the contact 40 exposed in the recess 16 has a difference in the level of the contact. Printed circuit board 12
There is almost no resistance to inserting Therefore, the printed circuit board 12 is substantially inserted into the housing 10 of the connector in a manner similar to a conventional so-called zero insertion force connector .
It is possible to over nest.

As shown in FIG. 4, when the printed circuit board 12 is not inserted into the housing 10 of the connector, the spring contact portion 50 of the contact 40 which is housed in contact with the upright side wall of the space 36 of the connector is formed. , Projecting into the recess 16 of the housing 10. Contact 40 at this time
Is W.

Next, when the printed circuit board 12 is inserted into the recess 16 of the housing 10, the terminals of the circuit board
The spring contact portion 50 of the contact portion 0 is pressed against the upright side wall of the cavity 36 from the recess 16. The width of the contact 40 at this time is X (FIG. 5).

By the way, the "load / stress" is plotted on the vertical axis, and
Taking the "displacement amount of the spring contact portion 50" on the horizontal axis, the load of the contact portion of the contact 40, the stress at the vertex a of the leg portion 44 of the spring contact portion 50, the stress at the lower end b of the spring contact portion 50, and the spring The characteristics of the spring indicating the load applied to the point c at which the contact portion 50 is displaced and the lower end b of the contact portion 50 contacts the holding portion 46 are shown by a diagram.
This is as shown in FIG. 6 and FIG.

The amount of displacement WX of the spring contact portion 50 of the contact 40 due to the insertion of the printed circuit board 12 into the housing 10 is determined in consideration of the manufacturing error of the thickness P of the printed circuit board 12 in actual use. , With a certain width. This is represented as a “use range” in FIGS. 6 and 7. In these figures, the amount of displacement of the spring contact portion 50 is 0.
To slightly beyond this range of use.

Next, referring to FIGS. 6 and 7, when the displacement of the spring contact portion 50 gradually increases from 0 and exceeds a certain value, the point c of the contact 40 comes into contact with the holding portion 46, and The load from the holding portion 46 is received. In this case, the amount of displacement of the spring contact portion 50 depends on the dimension of the contact 40 (that is, the height h from the point c to the vertex a of the hairpin-shaped holding portion 46; from the point c to the protruding end of the spring contact portion 50). Height k; and the distance m) between the hair pin-shaped holding portion 46 and the downward extension portion 48). Therefore, the displacement of the spring contact portion 50 can be adjusted by changing these numerical values.

As described above, when the displacement of the spring contact portion 50 of the contact 40 is increased, the load applied to the contact is increased by the load on the point c. That is, in FIG. 6, when the displacement of the spring contact portion 50 and [delta] _1, load on the point c, i.e. as reaction force indicated by dotted lines,
The inclination becomes large, and in FIG.
Assuming that the displacement amount is δ ₂ , the slope indicating the load on the point c increases. In addition, the increase in the stress at the point a becomes small depending on the dimensions, because the load on the point c is applied as a contact load and a counterclockwise moment.

The diagrams shown in FIGS. 6 and 7 show the difference between the displacements δ ₁ and δ ₂ of the spring contact portion 50 and the above-mentioned range of use. In FIG. ₁ is smaller than the use range, and FIG. 7 shows the displacement amount δ ₂ taken in the use range.

According to the present invention, as will be apparent from the above description, when there is no reaction force to the point c based on the load and stress of each part with respect to the displacement of the spring contact part 50 of the contact. The stress at the point a at the apex of the spring contact portion 50 can be reduced when there is a reaction force, as compared to

Further, the spring contact portion 50 is connected to the holding portion 46 by c.
Since the contact is made at the point and the electrical connection is made, the conduction path from the contact portion 50 is shortened, and the high-frequency characteristics can be improved.

Further, within the specified range, even in the vicinity of the maximum value of the spring contact portion 50, can be reduced stress at the point a in the same manner as described above.

In particular, when the printed circuit board 12 is warped and the amount of displacement of the spring contact portion 48 is increased, the point c is designed to receive a reaction force. Since the contact load sharply increases, there is an effect that the warpage of the printed circuit board 12 can be corrected by the force.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a housing of an edge connector of a printed circuit board according to the present invention at a portion where a contact is provided;
It is a figure which shows the insertion of a printed circuit board, and the rotation position after insertion.

FIG. 2 is an elevation view showing a contact of the connector of the present invention.

FIG. 3 is a schematic elevation view of the housing of the connector of the present invention viewed from the front.

FIG. 4 is a schematic diagram showing dimensions of each part of a contact of the connector of the present invention.

FIG. 5 is a schematic view illustrating displacement of a contact when a printed circuit board is inserted into the connector of the present invention.

FIG. 6 is a diagram showing an example of a relationship between a displacement amount of a spring contact portion of the contact of the present invention and a load / stress.

FIG. 7 is a diagram showing another example similar to FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Housing 12 Printed circuit board 14 Terminal 16 recess 18 Front inclined wall part 20 Rear upright wall part 22 Front vertical side wall 26 Top surface on front inclined wall part side 28 Top surface on rear upright wall part side 36 Front empty space 38 Rear empty Place 40 Contact 44 Leg 46 Holding part 48 Contact downward extension 50 Spring contact 60 Substrate 62 Fixing leg member

Claims (1)

(57) [Scope of request for utility model registration] 1. A recess (16) comprising a longitudinally extending insulating housing (10), into which a printed circuit board (12) is inserted at an angle along the longitudinal axis of said housing (10). And a printed circuit board (1) is provided in the recess (16).
2) accommodating a plurality of contacts (40) in electrical contact with the terminals (14) arranged along the edges of both sides, and the circuit board (12) is angled in the recess (16). so as to the final position pivoted from taking a position, deer
Also, the contact (40) has a straight leg (44), a holding portion (46) bent into a hairpin shape with the middle portion of the leg (44) as a vertex (a), and a downward extension (48). and then, the lower extension portion lower end (b) of (48) bent upward in a V-shape, to constitute a portion extending to the tip from the bent portion spring contact portions projecting arcuately outwardly (50) Success
The connector of the printed circuit board that, the other surface of the spring contact portion (50) and said printed circuit board (12) of the contact (40) in contact with the terminal (14) of one face of the printed circuit board (12) The height of the contact (40) contacting the terminal (14) of the printed circuit board (12) is made different from the height of the spring contact part (50) so as to provide resistance to the insertion of the printed circuit board (12) due to the difference in the level of the two contact parts. And when the printed circuit board (12) is inserted into the housing (10), the spring contact portion (5) of the contact (40).
If the displacement amount of the contact (4 ) exceeds a predetermined value, the contact (4)
The back (c) of the lower end (b) of the downward extension (48) of (0)
An edge connector for a printed circuit board, wherein the edge connector is adapted to contact the holding portion (46) .