JPH06188045A - Electric connector for printed board - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] Providing a printed circuit board electrical connector suitable for high density, which allows printed circuit boards to be joined at a small insertion angle, and ensures reliable contact and contact pressure. To do. A first spring contact 150 and a second spring contact 160, which are independent of each other, are provided at positions facing each other before and after the long groove of the insulating housing 110, and a height of a contact portion 153 of the first spring contact 150 is increased. Position and second
The height position of the contact portion 163 of the spring contact 160 is such that when the lower end portion of the printed circuit board is inserted into the long groove from the oblique front direction, the contact points on the front and rear surfaces of the lower end portion substantially contact those contact portions. However, after inserting the lower end of the printed circuit board into the long groove, when the printed circuit board is rotated about its lower end from its diagonally forward position toward the upright position by a predetermined angle, its lower end The front and rear contacts of the are displaced by a predetermined distance so that they are contacted by their contacts with sufficient contact force.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric connector for a printed circuit board, in which a printed circuit board having contacts arranged at a lower end at a predetermined pitch can be inserted / removed with zero insertion / removal force. , After inserting the lower end of the printed circuit board into the long groove in which the contacts of the insulating housing are arranged obliquely from the front, rotate the printed circuit board toward the upright position by a predetermined angle to complete the coupling of the printed circuit boards. The present invention relates to a zero insertion / removal force electric connector for a printed circuit board.

[0002]

2. Description of the Related Art Conventionally, as an example of such an electric connector called "zero insertion force", US Pat.
There was one disclosed in the specification No. 172 (JP-A-60-230378). This conventional electrical connector includes an insulating housing having a long groove that receives the lower end of the printed circuit board. In this insulating housing, a plurality of contacts are arranged at a predetermined pitch along the longitudinal direction of the long groove. The contacts are integrally formed by stamping from a springy and electrically conductive sheet material into a generally C or U shape.

These contacts are arranged and fixed to the insulating housing such that their contact portions project from the front and rear of the long groove of the insulating housing, and the height position of these contact portions is such that the printed circuit board is diagonally forwardly directed. , The contacts arranged on the front and rear surfaces of the lower end of the printed circuit board do not substantially contact the contact parts when the printed circuit board is inserted into the long groove of the insulating housing, but the printed circuit board is rotated to the upright position after insertion. When the connection of the printed circuit boards is completed, the contact portions are displaced by a distance such that they can contact each corresponding contact with a certain pressure.

Another conventional example of such an electrical connector called "zero insertion force" is disclosed in US Pat.
There are also electrical connectors such as those disclosed in 60386. This conventional electrical connector also includes an insulating housing having a long groove that receives the lower end of the printed circuit board. In this insulating housing, a plurality of contacts are arranged at a predetermined pitch along the longitudinal direction of the long groove. The contacts are stamped from a springy and electrically conductive sheet material.

However, unlike the contacts in the above-described conventional electrical connector, the contacts in the conventional electrical connector are formed such that the contacts arranged before and after the long groove are independent of each other. The contacts arranged along the front of the long groove and the contacts arranged along the rear of the long groove are arranged at positions shifted by a half pitch. Correspondingly, the positions of the contacts arranged at a predetermined pitch along the front surface and the rear surface of the lower end of the printed circuit board to be connected to this electric connector are also
It is offset by half a pitch.

The contacts are disposed and fixed to the insulating housing such that their contact portions project from the front and rear of the long groove of the insulating housing, and the height positions of the contact portions are such that the printed circuit board is diagonally forwardly directed. , The contacts arranged on the front and rear surfaces of the lower end of the printed circuit board do not substantially contact the contact parts when the printed circuit board is inserted into the long groove of the insulating housing, but the printed circuit board is rotated to the upright position after insertion. When the connection of the printed circuit boards is completed, the contact portions are displaced by a distance such that they can contact each corresponding contact with a certain pressure.

[0007]

The above-mentioned US Patent No. 4
In an electrical connector of the type as disclosed in US Pat. No. 5,755,172, the opposing contacts, before and after the slot, of one C-shaped or U-shaped contact integrally formed by stamping from a sheet material. Since they are parts, their height positions cannot be shifted so much in the front and back. For this reason, the angle when the lower end of the printed circuit board is inserted into the long groove of the insulating housing from the diagonally front direction is inevitably large, and has to be, for example, 30 degrees or more. Therefore, in order to complete the coupling of the printed board to the electrical connector, the rotation angle of the printed board that must be rotated is large, for example, 30 degrees or more.

As described above, if the rotation angle of the printed circuit board is large, there is a great risk of interfering with other connectors or mounted printed circuit boards when the printed circuit board is inserted / removed. Not very suitable for implementation.

Further, in the C-shaped or U-shaped contacts used in this conventional electric connector, the range in which these contact portions can be displaced without being subjected to plastic deformation is limited, so that it is attempted to make them compact. If the contact is made as small as possible, it becomes difficult to obtain a sufficient contact force with respect to the contact of the printed board. It can also be said that this is difficult to tolerate when a warp or the like occurs in the printed circuit boards to be joined.

Further, the two contact portions of the C-shaped or U-shaped contact respectively come into contact with the contacts provided on the front surface and the rear surface of the lower end portion of the printed circuit board, respectively. Since the parts are of the same contact, the front contact and the rear contact cannot be used as separate signal terminals. Therefore, even if the contacts are arranged so as to face each other on both sides of the printed circuit board to be coupled, it does not mean that the arrangement as the signal terminals is made high in density. This is not suitable for increasing the density of signal terminals in recent years.

In the conventional electrical connector as disclosed in the above-mentioned US Pat. No. 4,960,386, since the contacts arranged before and after the long groove of the insulating housing are independent, they are opposed to each other before and after the long groove. Since it is easy to shift the height position of the contact part to a large extent if necessary, the angle when inserting the lower end part of the printed circuit board into the long groove of the insulating housing from the oblique front direction is made as small as possible, for example, 30 degrees or less. Is relatively easy, and therefore, in order to complete the coupling of the printed circuit board to the electrical connector, the printed circuit board has to be rotated at a small rotation angle, for example, 30 degrees or less. In view of the above, the electrical connection of the type disclosed in the above-mentioned U.S. Pat. No. 4,575,172. It can be said to have been improved compared to the other.

However, this US Pat.
In the electrical connector of the specification of No. 86, the contact portions of the contacts arranged before and after the long groove are displaced from each other by a half pitch, so that the front and rear surfaces of the lower end portion of the printed circuit boards to be joined are arranged. The contacts to be arranged are also 2
It must be shifted by one-half pitch, which is a constraint on the contact density. Moreover, in this way, the contacts provided on the front surface and the contacts provided on the rear surface of the lower end portion of the printed circuit board are not opposed to each other, and are displaced by a half pitch, and at the positions displaced from each other. If the contact part of the contact makes pressure contact with the front and back contacts,
This is a problem because distortion in the twisting direction is always applied to the printed circuit board at the time of coupling.

Further, in this type of conventional electrical connector,
The structure is such that when the printed circuit board is rotated with respect to the insulating housing when the printed circuit board is inserted and removed, this is done with the end face of the lower end of the printed circuit board in contact with the bottom surface in the groove of the insulating housing. It was a problem. This is because the contacts are arranged near the end surface of the lower end of the printed circuit board, and dust and the like generated by contact between the bottom surface of the groove of the insulating housing and the end surface of the lower end of the printed circuit board are attached to these contacts. This is because it may cause contact failure.

An object of the present invention is to provide an electric connector for a printed circuit board which can solve the above-mentioned problems of the prior art.

[0015]

According to the present invention, a plurality of contacts are arranged at a predetermined pitch along the front surface and the rear surface of the lower end, and the front contact and the rear contact are opposed to each other. In a printed circuit board electrical connector capable of inserting and removing a printed circuit board as described in 1) with zero insertion and removal force, there is a long groove that can receive a lower end portion of the printed board from an oblique front direction, and the front and rear sides sandwich the long groove. An insulating housing having a plurality of contact disposing holes arranged at a pitch equal to the predetermined pitch and at positions opposite to each other in the front and rear thereof, and the long groove of the plurality of contact disposing holes. Inside the long groove so as to be contacted by the corresponding contact on the front surface of the lower end of the printed circuit board, which is arranged in each of the contact arrangement holes arranged in front, and is inserted into the long groove. A first spring contact having a protruding contact portion; and a printed circuit board arranged in each of the contact arrangement holes arranged after the long groove of the plurality of contact arrangement holes and inserted into the long groove. A second spring contact having a contact portion exposed in the long groove so as to be contacted by a corresponding contact on the rear surface of the lower end portion, wherein the first spring contact and the second spring contact include: The height position of the contact portion of the first spring contact in the long groove and the height position of the contact portion of the second spring contact in the long groove are independent of each other. When the lower end of the board is inserted into the long groove obliquely from the front side, the contacts on the front and rear surfaces of the lower end do not substantially come into contact with those contact parts, but After inserting the end portion into the long groove, when the printed circuit board is rotated about its lower end portion from its diagonally forward position to the upright position by a predetermined angle, the front and rear surfaces of the lower end portion are rotated. The contacts are offset by a predetermined distance so that they are contacted by their contacts with sufficient contact force.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the accompanying drawings.

FIG. 1 of the accompanying drawings is a schematic perspective view showing an electric connector for a printed circuit board as an embodiment of the present invention and a printed circuit board connected to the electric connector, which are opposed to each other. As shown in FIG. 1, the printed circuit board electrical connector 100 of this embodiment includes an insulating housing 110 integrally formed of an insulating material such as plastic. The insulating housing 110 includes a base portion 111 having a long groove 112, side walls 114 having a substantially U-shaped cross section formed upright from both sides of the base portion 111, and side walls extending upright from the base portion 111. The elastic lock piece 117 is formed so as to extend along the center of the U-shaped cross section of 114.

At the upper end of the front surface of the inner wall 115 of each side wall 114, a stopper projection 1 for performing the operation described below is provided.
16 is formed on the inner surface of the upper end of each elastic lock piece 117, and a stop projection 118 that functions as described later is formed.
Are formed. In addition, protrusions 119 for performing the operations described below are formed at both ends inside the long groove 112, and a contact portion arrangement chamber for exposing the contact portion of the spring contact is formed on the inner wall of the long groove 112. Partition walls 113 for defining the space are formed at predetermined intervals.

On the other hand, the printed circuit board 200 coupled to the printed circuit board electrical connector 100 is
A large number of contacts 201 are arranged at a predetermined pitch along the front surface and the rear surface of the lower end portion, and a contact 201 arranged on the front surface and a contact 201 arranged on the rear surface (not shown in FIG. 1). Are opposite to each other with the substrate sandwiched therebetween. Notches 202 are formed on both sides of the lower end portion, and each abutment surface 203 performs an operation described below.
Is giving. Furthermore, locking recesses 204 that function as described later are formed on both side edges of the printed circuit board 200.

Next, the operation for inserting / removing the printed circuit board 200 into / from the printed circuit board electrical connector 100 having such a structure will be briefly described with reference to FIGS. 2 and 3. First, the case where the printed circuit boards 200 are combined will be described. As shown in FIG. 2, the lower end of the printed circuit board 200 is connected to the electrical connector 10 for the printed circuit board.
0 is inserted into the long groove 112 of the insulating housing 110 from an oblique front direction, and the abutting surfaces 203 of both ends of the lower end portion of the printed circuit board 200 are provided on both sides in the long groove 112.
Try to make an appointment with. At this time, the dimensions of each part are designed so that the lower surface of the lower end portion of the printed circuit board 200 does not contact the bottom surface in the long groove 112 when the abutting surface 203 abuts the protrusion 119.

Then, with the abutting portion between the abutting surface 203 and the protrusion 119 as the center of rotation, the printed circuit board 200 is directed toward the front surface of the inner wall 115 of the side wall 114 of the insulating housing 110, that is, in the upright position. Rotate towards. Then, first, both side edges of the printed circuit board 200 come into contact with the stop protrusions 118 provided inside the upper end of the elastic lock piece 117. Then, each elastic lock piece 117 is biased outward by its elasticity so that both side edges of the printed circuit board 200 can get over the stop projection 118. When both side edges of the printed circuit board 200 pass over the stopper protrusion 118, the locking recesses 204 on both side edges of the printed circuit board 200.
Is the inner wall 11 of the side wall 114 of the insulating housing 110.
5 engages with a stop projection 116 provided on the upper part of the front surface of No. 5. At the same time, each elastic lock piece 117 returns to its original upright position by its own elasticity, and the stop projections 118 press the front surfaces of both side edges of the printed circuit board 200. FIG. 3 shows such a state.

FIG. 3 shows a state in which the printed circuit board 200 is completely connected to the printed circuit board electrical connector 100. In this completed state, the printed circuit board 200 has the front surface of the inner wall 115 and the stopper projection 118. The upright state of the printed circuit board 200 is retained by being sandwiched between them, and the upward protrusion of the printed circuit board 200 is prevented by the stopper projection 116 on the front surface of the inner side wall 115 and the locking concave portion 204 of the printed circuit board 200.
It is prevented by the engagement with and is in a locked state.
The contacts 201 arranged on both sides of the lower end of the printed circuit board 200 are provided in the long groove 112 of the insulating housing 100.
The spring contacts are in contact with the corresponding spring contacts arranged along the front and rear sides of the pin, which will be described later in detail.

In order to remove the printed circuit board 200 from the completed connection state shown in FIG. 3, the elastic lock pieces 117 on both sides of the insulating housing 110 are manually displaced to the outside so that the locking projection 118 of the printed circuit board 200 is formed. It should be detached from both edges. Then, the printed circuit board 200 is tilted obliquely forward by the spring force of the spring contacts arranged along the long groove 112 of the insulating housing 110, and thereafter, the printed circuit board 200 can be manually pulled out from the long groove 112. Good.

FIG. 4 is a front view showing more precisely the details of the printed circuit board electrical connector 100 as schematically described with reference to FIGS. 1 to 3, and FIG. 5 is a side view thereof. As well shown in FIGS. 4 and 5, the insulating housing 110 is provided with positioning columns 120 and pins 121 for mounting the printed circuit board electrical connector 100 on a printed board.

Next, the insulating housing 11 according to the present invention.
Details of the spring contacts arranged along the front and rear of the 0 long groove 112 will be described with reference to FIG. 6 in particular. FIG. 6 shows the long groove 112 of the printed circuit board electrical connector 100.
The reference numeral is entered in the enlarged cross-sectional view of the portion.

As shown in FIG. 6, the insulating housing 1
The base 111 of 10 includes a front wall 111A and a central wall 111.
A plurality of contact mounting holes 130 are formed between the contact mounting holes 130 and B at a pitch equal to the arrangement pitch of the contacts 201 on the front surface of the lower end portion of the printed circuit board 200. Not only is it open, but it also has an opening 130A at the upper end. Similarly, in the base portion 111 of the insulating housing 110, a plurality of contact mounting holes are provided between the rear wall 111C and the central wall 111B at a pitch equal to the arrangement pitch of the contact points 201 on the rear surface of the lower end portion of the printed circuit board 200. 140 is formed, and not only the lower end of each of these contact disposing holes 140 is open, but also the upper end has an opening 140A.

A first spring contact 150 is arranged in the contact arrangement hole 130, and a contact arrangement hole 140 is formed.
A second spring contact 160 is arranged in the. First
The spring contact 150 is formed integrally by punching and bending a sheet material having elasticity and conductivity. Second spring contact 160
Is formed independently of the first spring contact 150, and is also integrally formed by punching and bending from a sheet material having a spring property and conductivity.

The first spring contact 150 as a whole is bent into a shape as shown in FIG. 6, and has a connection fixing portion 151, an elastic arm portion 152, a contact portion 153, and a locking portion 154. And have. Also, the second
The spring contact 160 of the above is bent as a whole into a shape as shown in FIG.
1, an elastic arm portion 162, a contact portion 163, and a locking portion 164.

The first spring contact 150 has its connecting and fixing portion 151 attached and fixed to the inner wall at the lower end of the front wall 111A of the base 111 of the insulating housing 110, and the engaging portion 1
54 is engaged with the inner upper end wall 111D of the contact arranging hole 130, and the contact portion 153 is arranged in each contact arranging hole 130 so as to be exposed in the front surface of the long groove 112. At this time, it is preferable to set the dimensions of each part so that the elastic arm 152 can be preloaded, that is, subjected to an initial displacement by the engagement between the locking portion 154 and the inner upper end wall 111D.

Similarly, the second spring contact 160 is
The connection fixing part 161 is attached and fixed to the lower end inner wall of the rear surface wall 111C of the base 111 of the insulating housing 110,
The locking portion 164 is the inner upper end wall 1 of the contact arrangement hole 140.
The contact portions 163 are arranged in the respective contact arrangement holes 140 so as to be engaged with 11E and the contact portion 163 is exposed in the rear surface of the long groove 112. At this time, the locking portion 164 and the inner upper end wall 1
It is advisable to set the dimensions of each part so that the elastic arm 162 can be preloaded, that is, subjected to an initial displacement, by engaging with 11E.

Next, the dimensional relationship of each part important in the present invention will be described in detail. In this embodiment, the upper position of the contact portion 153 of the first spring contact 150 and the contact portion 163 of the second spring contact 163 are centered on the upper surface of the protrusion 119 serving as the rotation reference of the printed circuit board as described above.
The high position of is shifted by a dimension α. That is, the contact portion 153 of the first spring contact 150.
Is located below the reference rotation center by α / 2, and the contact portion 163 of the second spring contact 160 is located above the reference rotation center by α / 2.

Then, the contact portion 153 of the first spring contact 150 and the contact portion 16 of the second spring contact 160.
The distance a between the printed circuit board 200 and the printed circuit board 3 is orthogonal to the insertion direction of the printed circuit board 200 and is designed to be larger than the thickness dimension of the printed circuit board 200 to be coupled. Long groove 1 of printed circuit board 200
The insertion direction into 12 is determined by the inclination angle of the inner upper end wall 111D of the insulating housing 110, which is 20 degrees in this embodiment.

The insertion groove width b at the vertical position of the printed circuit board is designed to be sufficiently larger than the maximum value of the board tolerance, and the difference between the dimension b and the horizontal distance c between the contact portions (d1 + d).
2) creates a large margin for the connector.

Generally, in the conventional C-type or U-type contact, the left and right contact portions are integrally formed by stamping, and a sufficient α dimension is secured in terms of reliability of the contact portion (securing contact pressure). Can not. Moreover, in any of the conventional connectors, it is not possible to secure a sufficient α dimension for receiving the printed circuit board at a small insertion angle. On the other hand, according to the present invention, since the left and right (front and rear) contact portions are independent, a sufficient α dimension can be secured to receive the printed circuit board at a smaller insertion angle and secure a sufficient contact pressure. .

A sufficient α dimension realizes a smaller horizontal distance c dimension (when the rotation angle is constant). Also, the sufficient α dimension provides for receiving a printed circuit board at a smaller insertion angle. Furthermore, the difference d1 and d2 of b-c
Is the displacement of each contact part, and depending on the design, it is 2 of the conventional example.
More than double is feasible. Large contact displacements d1 and d
2 is determined by the sufficient α dimension, the center of rotation (in the case where both d1 and d2 are maximum) and the insertion angle of the printed circuit board arranged almost in the center, and allows a reliable contact and a thickness tolerance of the insertion circuit board. Has an effect on. As described above, when the first spring contact and the second spring contact are independent and are arranged in a preloaded state, sufficient contact pressure can be obtained even with the minimum displacement of the contact portion. Can be secured.

The operation of coupling the printed circuit board 200 to the printed circuit board electrical connector 100 will be repeatedly described. The first spring contact 150 and the second spring contact 160 having such a dimensional relationship are arranged. The lower end of the printed circuit board 200 is inserted into the long groove 112 of the insulating housing 110 from an oblique front direction so that the abutting surface 203 abuts the upper surface of the protrusion 119.
The insertion angle is 20 degrees in this embodiment, that is, the front surface of the printed circuit board 200 is the insulating housing 11.
It may be inserted so as to be in contact with the inclined surface of the inner upper end wall 111D of 0. At this time, the lower end of the printed circuit board 200 and the contact portion 153 of the first spring contact 150 are not
Of the spring contacts 160 are inserted into the spring contacts 160 without substantially contacting them. Therefore, its insertion force is substantially zero.

Next, the printed board 200 is rotated toward the upright position with the abutting portion between the abutting surface 203 and the protrusion 119 as the center of rotation. Then, the first spring contact 15
The contact portion 153 of 0 is pressed and brought into contact with the corresponding contact 201 on the front surface of the lower end portion of the printed circuit board 200 while being displaced forward by approximately the dimension d2, and the contact portion 163 of the second spring contact 160 is It is pressed and brought into contact with the corresponding contact 201 on the rear surface of the lower end portion of the printed circuit board 200 while being displaced rearward by substantially the dimension d1. The lower surface of the lower end of the printed board 200 does not come into contact with the bottom surface of the long groove 112 during the rotating operation of the printed board 200.

In the above-described embodiment, the projections 119 for giving the rotation reference are provided on both sides in the long groove 112, but the present invention is not limited to this, and these projections may be arranged in any desired shape in the long groove. It may be provided at a position.

[0039]

Since the electric connector for a printed circuit board according to the present invention has the above-mentioned structure, the following operational effects can be obtained.

First, since the left and right (front and rear) contact portions are independent of each other, it is easy to make the α dimension sufficiently large, so that the insertion angle of the printed circuit board can be made small and yet reliable. Contact and contact pressure can be secured. Further, since it becomes possible to connect the contacts on both sides of the printed circuit board as separate signal terminals, it is possible to realize a high density (double-sided connection) that is double the density of the conventional one. Furthermore, it is unlikely to be affected by warpage of the printed circuit board.

Secondly, since the left and right (front and rear) contact portions are located at positions facing each other, this is advantageous for narrow pitch high-density mounting. Also, no extra stress (torsional strain) is applied to the printed circuit board.

Thirdly, the abutting surface is provided at the lower end of the printed circuit board, and the abutting portion between the abutting surface and the projection provided in the long groove is used as the center of rotation of the printed circuit board to rotate the printed circuit board. Since it is possible to prevent the lower surface of the lower end portion of the printed circuit board from coming into contact with the bottom surface in the long groove, it is possible to prevent a contact failure due to dust or the like that may occur at the time of such contact.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an electric connector for a printed circuit board as an embodiment of the present invention and a printed circuit board to be connected to the electric connector, facing each other.

FIG. 2 is a schematic perspective view showing a state where a printed circuit board has started to be inserted into the printed circuit board electrical connector of FIG.

FIG. 3 is a schematic perspective view showing a state in which the printed circuit board is completely connected to the printed circuit board electrical connector of FIG.

FIG. 4 is a front view showing the details of the electric connector for a printed circuit board shown in FIG. 1 more accurately.

5 is a side view of the printed circuit board electrical connector of FIG. 4; FIG.

FIG. 6 is a view in which reference symbols are entered in the enlarged cross-sectional view of the long groove portion of the printed circuit board electrical connector in FIG. 4.

[Explanation of symbols]

 100 Electrical Connector for Printed Circuit Board 110 Insulation Housing 111 Base 112 Long Groove 115 Inner Side Wall 116 Inner Wall 116 Locking Protrusion 117 Elastic Locking Piece 118 Locking Protrusion 119 Projection 130 Contact Disposing Hole 140 Contact Disposing Hole 150 First Spring Contact 151 Connection Fixing Part 152 Elastic Arm part 153 Contact part 154 Lock part 160 Second spring contact 161 Connection fixing part 162 Elastic arm part 163 Contact part 164 Lock part 200 Printed circuit board 201 Contact 202 Notch 203 Abutment surface 204 Lock recess

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hirokatsu Yaegashi 5-5-23 Osaki, Shinagawa-ku, Tokyo Hirose Electric Co., Ltd. Inside FANUC CORPORATION (72) Inventor Hiroyuki Suwa 3580 Kobaba, Oshinomura, Minamitsuru-gun, Yamanashi Prefecture Inside FANUC CORPORATION

Claims (4)

[Claims] 1. A zero insertion / removal of a printed circuit board in which a plurality of contacts are arranged along a front surface and a rear surface of a lower end portion at a predetermined pitch, and the front contact and the rear contact are opposed to each other. In an electric connector for a printed circuit board that can be inserted and removed by force, a long groove that can receive a lower end portion of the printed circuit board from an oblique front direction is provided, and a pitch equal to the predetermined pitch along the front and back with the long groove interposed. In addition, an insulating housing having a plurality of contact arrangement holes arranged in front and back of the contact arrangement holes, and a contact arrangement hole arranged in front of the long groove among the plurality of contact arrangement holes. A first spring having a contact portion exposed in the long groove so as to be contacted by a corresponding contact on the front surface of the lower end of the printed circuit board which is disposed in each of the slots and is inserted into the long groove. The contacts are brought into contact with corresponding contact points on the rear surface of the lower end of the printed circuit board, which are arranged in the contact arrangement holes arranged after the long groove among the plurality of contact arrangement holes and are inserted into the long grooves. And a second spring contact having a contact portion exposed in the long groove, the first spring contact and the second spring contact being formed independently of each other. The height position of the contact portion of the first spring contact in the long groove and the height position of the contact portion of the second spring contact in the long groove refer to the lower end of the printed circuit board in the long groove. When the front end and the rear face of the lower end of the printed circuit board are inserted into the slot from the front, the lower end of the printed circuit board is not inserted into the slot. After that, when the printed circuit board is rotated about its lower end from its diagonally forward position to its upright position by a predetermined angle, the contact points on the front and rear surfaces of its lower end are An electric connector for a printed circuit board, which is displaced by a predetermined distance so as to be contacted with a sufficient contact force. 2. In the long groove of the insulating housing,
A protrusion serving as a rotation reference is provided at a predetermined height position from the bottom surface of the long groove, and the lower end portion of the printed circuit board is in a position corresponding to the protrusion and abuts against the protrusion so that its lower end portion. An abutting surface is formed to prevent the lower surface of the printed circuit board from contacting the bottom surface of the long groove, and the rotation of the printed board by the predetermined angle is performed around the abutting portion between the protrusion and the abutting surface. The electric connector for a printed circuit board according to claim 1, wherein. 3. The protrusions are provided on both sides in the long groove, and the abutting surfaces are provided by notches provided on both sides of a lower end portion of the printed circuit board. Electrical connector for printed circuit boards. 4. The contact portion of the first spring contact and the contact portion of the second spring contact are arranged above and below the abutting portion between the protrusion and the abutting surface. The electric connector for a printed circuit board according to item 3.