JPH07245157A - Connector structure - Google Patents

Abstract

PURPOSE:To establish a connector structure which can work well with an increased number of connector poles and can prevent the connector from slipping off. CONSTITUTION:Terminal pads 5a, 55 are furnished on the two surfaces of a base board 3, and a connector 2 is formed in a card edge type, and an upper contact pin 10 and lower contact pin 11 are provided which are put in pressure contact with the terminal pads 5a, 5b. The pressure contacting force should be larger in the upper contact pin 10. A retention part 13b is furnished in the upper part of the connector 2 and is engaged by a connector guide 6 mounted on the base board 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connector structure for connecting a printed wiring board and a conductive member such as a flexible cable.

[0002]

2. Description of the Related Art Conventionally, as a means for connecting a printed wiring board and a flexible cable, there is a card edge type connector that connects both without using solder. When the contact pin of the connector connected to the flexible cable and the terminal pad of the board come into contact with each other, the flexible cable and the board are connected.The positioning of the contact pin and the terminal pad is provided with an insertion opening for inserting the connector on the board side. This is done by matching the dimensions of this insertion port with the connector.

Further, there is a mechanism provided with a detachment preventing mechanism for preventing the connector from being easily removed. As such a mechanism, a convex portion is provided on the housing of the connector and the convex portion is inserted into the insertion opening on the board side at the time of insertion. There is one that is locked to.

[0004]

However, in the above-mentioned conventional connector structure, since the contact pins of the connector are arranged in one row, the row must be lengthened in order to increase the number of connector poles. The width dimension of will increase. Therefore, there is a problem that it takes too much space to be applied to a small unit such as a print head of an electrophotographic printing apparatus.

In order to prevent the width of the connector from becoming too large, the connecting portions of the board can be connected on both sides, and two rows of contact pins can be provided correspondingly. The connector has a problem that it is difficult to provide a disconnection prevention mechanism.

[0006]

Means for Solving the Problems In order to solve the above-mentioned problems, the means taken by the present invention is a card edge type of double-sided connection for a printed wiring board connecting portion, which is connected to a conductive member to be connected to the printed wiring board. First and second contact portions that are attached to a connector into which the board connecting portion is inserted and press contact with both surfaces of the inserted board connecting portion with different pressure contact forces; and a first locking portion formed in the connector. , Formed on the substrate,
A second locking portion that locks to the first locking portion due to a difference in pressure contact force between the first and second contact portions is provided.

The first contact portion and the second contact portion may be made to have different flexure amounts so as to have different pressure contact forces. Further, the first engaging portion may be a convex portion formed on the upper portion of the connector, and the second engaging portion may be an arch-shaped member formed on the board connecting portion. Further, in order to lock the first locking portion and the second locking portion, the first and second contact portions are pressure-contacted to both surfaces of the board connecting portion at different positions, and the difference between the pressure-contacting positions. The first locking portion and the second locking portion may be locked by the moment generated by.

[0008]

According to the present invention having the above-mentioned structure, since the connecting portion of the printed wiring board is connected on both sides, it is not necessary to increase the width dimension of the connector even if the number of connector poles is increased. Further, the connector is provided with the first locking portion, and the board is provided with the second locking portion, so that the connector can be connected to the connector depending on a difference in pressure contact force between the first and second contact portions of the connector or a difference in pressure contact position. Since the urging force is applied in the direction, the first locking portion can be locked to the second locking portion.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. Note that elements common to the drawings are given the same reference numerals. 1 is a sectional view showing a connector structure of a first embodiment according to the present invention, FIG. 2 is a perspective view showing a connector structure of the first embodiment, and FIG. 3 is a sectional view showing a connector of the first embodiment.

1 and 2, a connector structure 1 of the first embodiment is composed of a connector 2 and a connecting portion 4 of a substrate 3. A terminal pad 5a is formed on the upper surface of the connecting portion 4 of the substrate 3, and a terminal pad 5b is formed on the lower surface. Arch-shaped connector guides 6 are fixed to both sides of the connection portion 4 by screws 7a and 7b. The connector guide 6 has an insertion port 8 on the upper portion of the terminal pad 5a, and the connector 2 is inserted therein.

At the card edge connecting portion 9 of the connector 2,
An upper contact pin 10 and a lower contact pin 11 are provided. Both contact pins 10, 11 are shown in FIG.
As shown in, the cross section is substantially S-shaped and has contact portions 10a, 10b, 11a and 11b, respectively. Contact part 1
0a contacts the terminal pad 5a of the substrate 3, and the contact portion 10b
Contacts the flexible cable 12a. Further, the contact portion 11a contacts the terminal pad 5b of the substrate 3,
b contacts the flexible cable 12b. The flexible cables 12a and 12b are fixed to the housing 2a of the connector 2, respectively.

The positions of the contact portion 10a and the contact portion 11a are displaced in the insertion direction of the substrate 3 by a distance L1 as shown in FIG. In addition, the amount of possible flexure δ of the upper contact pin 10
1 is set to be larger than the possible deflection amount δ2 of the lower contact pin 11. That is, δ1> δ2 is set. With this setting, the pressure contact force of the upper contact pin 10 with respect to the substrate 3 becomes larger than the pressure contact force of the lower contact pin 11 with respect to the substrate 3.

On the upper part of the connector 2, a convex locking portion 13 is provided.
a and 13b are formed. The locking portions 13a, 13
b has a gently sloping portion on the insertion side of the substrate 3 so that the connector 2 can be easily inserted into the insertion port 8 of the connector guide 6. The height L2 of the insertion opening 8 of the connector guide 6 is set to be slightly larger than the height L3 from the card edge connecting portion 9 of the connector 2 to the tops of the locking portions 13a and 13b, and from the contact portion 10a of the upper contact pin 10. The height is set to be slightly smaller than the height of the locking portions 13a and 13b.

Next, the connection operation of the first embodiment will be described. When the connection portion 4 of the board 3 is fitted into the card edge connection portion 9 of the connector 2 so that the upper insertion portion 2b of the connector 2 is inserted into the insertion opening 8 of the connector guide 6, the connection portion 4 of the board 3 is moved upward. The connector guide 6 rides over the locking portions 13a and 13b while bending the contact pin 10 upward. When the connector guide 6 gets over the locking portions 13a and 13b, the substrate 3 comes into contact with the lower surface 9a of the card edge connecting portion 9 by the pressure contact force of the upper contact pin 10. The connecting portion 4 is inserted up to the abutting portion 9b. At this time, the upper contact pin 10 contacts the terminal pad 5a,
The lower contact pin 11 contacts the terminal pad 5b.
Thereby, the connecting portion 4 of the substrate 3 and the flexible cable 1
2a and 12b are connected.

The contact force of the contact pin against the substrate 3 is larger in the upper contact pin 10 (δ1>
δ2), the substrate 3 is always the lower surface 9a of the card edge connecting portion 9.
Maintain contact with. Further, by keeping the substrate 3 in constant contact with the lower surface 9a, the state in which the upper portion 6a of the connector guide 6 is locked by the locking portions 13a, 13b is maintained.

In the first embodiment, as described above, the substrate 3 is composed of the upper contact pin 10 and the lower contact pin 11.
Since the contact position with respect to is displaced, a moment is generated between the substrate 3 and the upper and lower contact pins 10 and 11, and the moment 15 shown in FIG. Due to this moment 15, the upper surface 2c of the connector 2
Presses against the connector guide 6 more strongly. Due to this stronger pressure contact force, the state where the upper portion 6a of the connector guide 6 is locked to the locking portions 13a and 13b is further strongly held.

As described above, according to the first embodiment, the substrate 3
Since the terminal pads are provided on both sides of the connecting portion 4, the width of the connector 2 does not increase even if the number of connector poles increases.
Further, by utilizing the difference in the pressure contact force of the contact pin with respect to the substrate 3, even in the card edge type connector, the locking portion can be provided.

Next, a second embodiment according to the present invention will be described. FIG. 4 is a sectional view showing the connector structure of the second embodiment. In the figure, the connector structure 21 of the second embodiment is shown.
Is composed of a connector 22 and a board 23. The board 23 has terminal pads 25 a, 25 on both surfaces of the connecting portion 24.
b is formed and a locking hole 26 is also formed.

The connector 22 has an upper contact pin 2
7 and the lower contact pin 28 are provided, and the contact portions 27a and 28a respectively contact the terminal pads 25a and 25b.
Are displaced so that the contact portion 28a is on the back side.
Further, the jaw portion 29 of the connector 22 is projected toward the substrate 23 side, and a projection 30 is formed upward at the tip portion thereof. The protrusion 30 is adapted to fit into the locking hole 26 when the board 23 is connected to the connector 22.

In the second embodiment thus constructed, when the board 23 is connected to the connector 22, the connector 22 is prevented from moving due to the displacement of the contact positions of the upper and lower contact pins 27 and 28.
In contrast, a moment 31 as shown in the figure acts. Due to this moment 31, the projection 30 is always held in a state of being fitted into the locking hole 26 of the substrate 23. By providing a plurality of projections 30 and a plurality of locking holes 26, the connector 22 is locked more firmly.

As described above, in the second embodiment, since it is not necessary to provide the connector guide of the first embodiment with respect to the board 23, the connector 22 can be locked with a simpler structure.

FIG. 5 is a front view showing the connector of the third embodiment according to the present invention, and FIG. 6 is a side view showing the connector of the third embodiment. Next, the connector structure of the third embodiment will be described. . In both figures, the connector 31 of the third embodiment is provided with an upper contact pin 32 and a lower contact pin 33, and the upper contact pin 32 is provided two more than the lower contact pin 33. Further, similar to the first embodiment, the contact portion 32a of the upper contact pin 32 is formed.
Is located on the inner side of the contact portion 33a of the lower contact pin 33. The other structure is similar to that of the first embodiment.

By making the number of the upper contact pins 32 larger than that of the lower contact pins 33, the pressure contact force with respect to the substrate becomes larger in the upper contact pins 32. Due to the large pressure contact force of the upper contact pin 32, also in this embodiment, the moment 15 shown in FIG. 1 acts on the connector 31 when it is connected to the substrate, so that the connector 31 can be securely locked. Further, in this embodiment, the connector 31 can be locked even if the possible bending amounts of the upper contact pin 32 and the lower contact pin 33 are set to the same degree.

[0024]

As described in detail above, according to the present invention, the connector is a double-sided card edge type connector, and the moment due to the difference in the pressure contact force of the upper and lower contact pins with respect to the substrate or the displacement of the pressure contact position is utilized. This makes it possible to cope with an increase in the number of connector poles and to provide a connector locking mechanism.

[Brief description of drawings]

FIG. 1 is a sectional view showing a connector structure of a first embodiment according to the present invention.

FIG. 2 is a perspective view showing the connector structure of the first embodiment.

FIG. 3 is a sectional view showing the connector of the first embodiment.

FIG. 4 is a sectional view showing a connector structure of a second embodiment.

FIG. 5 is a front view showing a connector of a third embodiment.

FIG. 6 is a side view showing a connector of a third embodiment.

[Explanation of symbols]

 2 connector 3 substrate 4 connection part 5a, 5b terminal pad 6 connector guide 10 upper contact pin 11 lower contact pin 12a, 12b flexible cable 13a, 13b locking part

Claims (5)

[Claims] 1. A connector structure for connecting a printed wiring board and a conductive member, wherein the board connecting portion is a double-sided card edge type, and is attached to and inserted into a connector which is connected to the conductive member and into which the board connecting portion is inserted. First and second contact portions that are pressed against each other on both sides of the substrate connecting portion with different pressure contact forces, a first locking portion formed on the connector, and the first contact portion and the first contact portion formed on the substrate. 2. A connector structure comprising: a second locking portion that locks to the first locking portion due to a difference in pressure contact force between the two contact portions. 2. The connector structure according to claim 1, wherein the first contact portion and the second contact portion are made to have different deflection amounts so that the pressure contact forces of the first contact portion and the second contact portion are made different. . 3. The connector structure according to claim 1, wherein the first locking portion is formed in a convex shape on an upper portion of the connector, and the second locking portion is formed in an arch shape in the board connecting portion. . 4. A connector structure for connecting a printed wiring board and a conductive member, wherein the board connecting portion is a double-sided card edge type, and is attached to and inserted into a connector which is connected to the conductive member and into which the board connecting portion is inserted. The first and second contact portions that are pressed against both surfaces of the board connecting portion at different positions; the first locking portion formed on the connector; and the first contact portion and the second contact portion formed on the board. A connector structure comprising: a second locking portion that locks with the first locking portion by a moment generated due to a difference in pressure contact position of the contact portion. 5. The connector according to claim 4, wherein the first engaging portion is a convex portion formed on the board insertion side of the connector, and the second engaging portion is a hole formed in the board. Construction.