JP2001015196A - Connector for flexible board and its mounting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance reliability in soldering and to cut a mounting area to a PCB, as for a connector for a flexible board. SOLUTION: A lead part 37 is extended downward from a linking part 36 to link the fixed piece part 33 and the elastic piece part 35 of a contact 11. The lead part 37 has a first part 39 extending downward along the rear end 42 of the lower plate part 12 of a housing 4 and a second part 41 extending frontward along the lower surface 26 of the lower plate part 12. The upper part of the second part 41 is stored in a recessed part 43 formed on the lower surface 26 of the lower plate part 12. The height from a PCB 29 to the lower plate part 12 gets higher by the depth of the recessed part 43, and solder is prevented from rising. The lead parts 22, 37 of each contact 11 are in the projected space A of the housing 4 and a lid part 7 in a closed state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connector for a flexible board used for connecting a flat flexible cable or PCB called an FPC and a mounting structure thereof.

[0002]

2. Description of the Related Art
In a connector mounted on the surface of a PCB, legs of an L-shaped lead portion for soldering to a conductive member on the surface of the PCB are exposed to the side of the connector. Therefore, PC
On the surface of B, the area for mounting the connector becomes large, and it is not possible to meet the demand for miniaturization.

On the other hand, by applying a ball grid array technology (BGA technology) in which an IC chip is mounted on a substrate without using external leads, even in a connector, contacts are formed on a substrate directly below a connector housing via solder balls. It has been proposed to electrically connect to a conductive pad (for example, JP-A-10-162909). In this case, there is an advantage that the external leads protruding to the side of the connector housing can be eliminated and the size can be reduced.

However, when the above-mentioned solder ball is used, the solder ball is located between the lower surface of the housing and the surface of the substrate and regulates a gap between the two before the soldering. Hot air is sent through the gap to reflow the solder balls. If the gap is widened, a sufficient amount of hot air can be sent, so that good soldering can be performed, but this is contrary to the demand for small size. Conversely, if the gap is narrowed, it can contribute to miniaturization, but the amount of hot air is insufficient and the reliability of soldering decreases. For this reason, it is necessary to accurately set the amount of the gap.

[0005] However, in the above BGA technology,
Since a part of the solder ball is housed in the lower end of the housing hole of the contact, the amount of the gap is determined by both the opening diameter of the housing hole and the diameter of the solder ball. As a result, it is very difficult to accurately set the amount of the gap due to the influence of variations in the dimensional accuracy of the two and the combination accuracy of the two. Therefore, it is difficult to achieve both miniaturization of mounting and reliability of soldering.

[0006] Further, since a part of the solder ball is accommodated in the lower end of the contact hole, wicking in which the molten solder is sucked up into the hole tends to occur. In order to prevent this, it is necessary to apply a treatment such as coating or plating a material having no solder wettability to the intermediate portion of the contact, which increases the manufacturing cost.

The present invention has been made in view of the above problems, and has as its object to provide a board surface mounting connector which can save space for mounting on a PCB and has high soldering reliability. I do.

[0008]

Means for Solving the Problems and Effects of the Invention As a means for solving the above problems, the invention according to the first aspect of the present invention comprises a plurality of contacts arranged so as to face openings of a housing which opens upward. And a lid member capable of opening and closing the opening of the housing, and the contactor has an elastic piece for pressing the flexible substrate facing up and down of the housing and a fixing piece fixed to the housing groove of the housing, In a flexible board connector including a connecting portion for connecting the base portions of the fixed piece portion and the elastic piece portion to each other, and a lead portion extended from the connecting portion and soldered to a conductor pattern on the surface of the PCB, The contact is formed by stamping with a press, and only the lead is exposed at the front end or the rear end of the lower plate of the housing. A first portion extending downward and a second portion extending from the first portion along the lower surface of the lower plate portion of the housing are disposed in a vertical projection space of the housing and the closed lid member. A lower plate portion of the housing is sandwiched between the second portion of the lead portion and the connecting portion, and an upper portion of the second portion has a concave portion formed on a lower surface of the lower plate portion of the housing. Characterized by being housed in

In the present invention, since the lead portion is a so-called outgoing lead extending along the lower surface of the lower plate portion of the housing, it interferes with an obstacle as in the case of a so-called outgoing lead protruding forward or backward of the housing. It is less likely to be deformed. In addition, since the lead portion is arranged in the vertical projection space of the housing and the closed lid member, the mounting area on the PCB can be reduced and space can be saved.

[0010] Further, by simply press-fitting the contact so that the lower plate of the housing is sandwiched between the lead and the connecting portion,
The amount of protrusion of the lead from the lower plate of the housing can be easily and accurately defined. In addition, since the contact is formed by press punching, dimensional accuracy is achieved with less variation than in the case of bending, and as a result, the coplanarity of the tip of the lead portion is accurately obtained with a simple configuration and a simple process. Nature can be secured.

Further, since the upper surface of the second portion of the lead portion is accommodated in the concave portion of the lower plate portion of the housing, the lower plate portion of the housing is separated from the surface of the PCB by the depth of the concave portion near the lead portion. This can prevent a phenomenon in which solder or flux for soldering is sucked upward (wicking, also referred to as flux rise).

According to a second aspect of the present invention, there is provided a mounting structure of a flexible board connector for mounting the flexible board connector according to the first aspect on a board, wherein the conductor is formed on a surface of a PCB and connected to the lead portion. The pattern is arranged in a region corresponding to the vertical projection space of the housing and the lid member in the closed state. According to the present invention, the area for mounting the connector on the PCB can be reduced.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described with reference to the accompanying drawings. 1 (a) and 1 (b) are a plan view and a front view of a flexible board connector showing a state where a lid member is opened, and FIG.
FIG. 3 is a cross-sectional view taken along a line II-III in FIG. 1. With reference to these drawings, the flexible board connector 1 (hereinafter, also simply referred to as the connector 1) includes a flexible board 2 (hereinafter, simply referred to as a connector 1) from the front.
A housing 4 made of a synthetic resin is provided to define an insertion / extraction space 3 into which an FPC 2 is inserted / extracted. The front half of the housing 4 is opened upward through an opening 6 of the upper plate 5 of the housing 4 and a lid made of a synthetic resin molded product that can be opened and closed by turning the opening 6. A member 7 is provided. The lid member 7 is attached to the housing 4 so as to be rotatable around a rotation axis 8. 9
Is a metal reinforcing tab for improving the strength of the housing, and supports a rotation support shaft (not shown) including the rotation axis 8 on the housing.

A plurality of first contacts 10 which are inserted into the insertion / extraction space 3 of the housing 4 from the front side and fixed thereto, and are inserted into the insertion / extraction space 3 of the housing 4 from the rear side. A plurality of second contacts 11 to be fixed are arranged side by side and alternately. The front end of the second contact 11 is located at a position retracted by a predetermined distance from the front end 13 of the lower plate portion 12 of the housing.

Referring to FIGS. 1 and 2, a first contact 1
Numeral 0 is a metal member stamped and formed by pressing. The first contact 10 includes a fixing piece 15 that is housed in a housing groove 14 formed on the upper surface of the lower plate 12 of the housing 4 from the front side along the insertion direction X of the FPC 2, A first elastic piece 18 connected to each other via a front end 16 and a connecting portion 17; a first elastic piece extending in a lateral J-shape rising from the vicinity of a rear end 19 of the fixed piece 15 and extending forward; And a second elastic piece 20 reaching above the rear of the part 18.

Numeral 31 denotes a downwardly protruding chevron provided at the front end of the second elastic piece 20. The FPC 2 is elastically sandwiched and in contact with the rear end of the first elastic piece 18. Ensure pressure. The rear end 19 of the fixing piece 15 has a press-fitting projection and is press-fitted and fixed in a fixing hole 21 provided in the rear part of the housing 4. The lower part of the connecting part 17 has an inverted T
A lead portion 22 having a character shape is extended. Lead 2
2 includes a first portion 23 extending downward along the front end 13 of the lower plate portion 12 of the housing 4, a second portion 24 extending rearward from the lower end of the first portion 23, and a first portion 23. A third portion 25 extending forward from the lower end. The lower plate part 12 of the housing 4 is sandwiched between the second part 24 of the lead part 22 and the connecting part 17, whereby the connecting part 17, which is the front part of the first contact 10, is attached to the housing 4. Fixed.

In the cross section of FIG. 2, the lower surface 26 of the lower plate portion 12 of the housing 4 has a concave portion 27 formed at a predetermined distance from the front end 13, and the second portion 24 of the lead portion 22 is formed by the concave portion. It extends rearward along 27. The lower surface 28 of the second portion 24 of the lead portion 22 comes into contact with the surface 30 of the PCB 29, and the distance between the lower surface 28 of the second portion 24 and the lower surface 26 of the lower plate portion 12 is , So that the so-called solder wicking can be prevented.

Second and third portions 24, 25 serving as legs
Is included in the vertical projection space A of the outer shape of the housing 4 and the lid member 7 in the closed state, and as a result, a conductor connected to the lead portion 22 on the surface 30 of the PCB 29 The pattern (not shown) will be arranged in the area B corresponding to the projection space A,
The mounting space for the connector 1 on the PCB 29 can be reduced.

Next, referring to FIGS. 1 and 3, the second contactor 11 is made of a metal member stamped and formed by pressing, and is inserted into the insertion / removal space 3 of the housing 4 from the rear side by FPC.
2 and is fixed along the withdrawal direction Y. The second contactor 11 is formed on the upper surface of the lower plate portion 12 of the housing 4 with a fixing piece portion 33 having a locking projection inserted from the rear side and fixed in the fixing hole 32 on the upper portion of the housing 4. An elastic piece 35 accommodated from the rear side in the accommodation groove 34 and positioned below the fixed piece 33, a connecting part 36 for connecting the fixed piece 33 and the rear end of the elastic piece 35 to each other, and a connecting part 3
6 and a lead portion 37 extended below the lower end of the lead 6.

The front ends of the fixed piece portion 33 and the elastic piece portion 35 extend to an intermediate portion of the housing 4 in the front-rear direction. At the front end of the elastic piece portion 35, an upwardly projecting projection 38 for securing a contact pressure with the FPC 2 is formed. The lead portion 37 is connected to a first portion 39 extending downward from a lower portion of the connecting portion 36, and a lower end of the first portion 39 via an inclined corner portion 40. A second portion 41 extending forward along 26;
The whole has a substantially J-shape.

In the cross section of FIG. 3, the lower surface 26 of the lower plate portion 12 of the housing 4 forms a concave portion 43 at a predetermined distance from the rear end 42, and the second portion 41 of the lead portion 37 is formed.
Extends forward along the recess 43. Lead part 3
The lower surface 46 of the second part 41 of FIG.
, But the lower surface 4 of the second portion 41
Since the distance between the lower surface portion 6 and the lower surface 26 of the lower plate portion 12 is set apart by the depth of the concave portion 43, it is possible to prevent so-called solder rising.

The lead portion 37 including the second portion 41 serving as a leg is included in the projection space A in the vertical direction of the outer shape of the housing 4 and the closed lid member 7. As a result, on the surface 30 of the PCB 29, the conductor patterns 44, which are respectively connected to the lead portions 22 and 37,
45 is arranged in the area B corresponding to the projection space A, and the mounting area of the connector 1 on the PCB 29 can be reduced.

As described above, according to the present embodiment, the lead portions 22 and 37 are so-called outgoing leads along the lower surface 26 of the lower plate portion 12 of the housing 4, so that the so-called outgoing leads are used. It is less likely to deform due to interference with obstacles. Further, the contacts 10, 11 are sandwiched between the second portions 28, 41 of the leads 22, 37 and the connecting portions 17, 36 so as to sandwich the lower plate 12 of the housing 4.
By simply press-fitting, the amount of protrusion of the lead portions 22 and 37 from the lower plate portion 12 of the housing 4 can be easily and accurately defined. In addition, since the contacts 10 and 11 are formed by press stamping, dimensional accuracy with no variation is achieved as compared with the case where the contacts are formed by bending. As a result, the leads 22, 22 can be accurately formed with a simple configuration and a simple process. The coplanarity of the tips of the 37 can be ensured.

The second portion 2 of the lead portion 22, 37
4 and 41 are recesses 2 of lower plate 12 of housing 4.
7 and 43, the height from the surface 30 of the PCB 29 to the lower plate portion 12 of the housing 4 can be increased by the depth of the concave portions 27 and 43 in the vicinity of the lead portions 22 and 37. Thus, it is possible to prevent a phenomenon in which the solder or the flux for soldering is sucked upward (wicking, also referred to as flux rising).

The second portion 24 of the lead portion 22 of the first contact 10 is in close contact with the recess 27, so that the suction of the molten solder due to the surface tension can be more reliably prevented. On the other hand, the second portion 41 of the lead portion 37 of the second contact 11
Has a gap between the recess 43, but the sucked molten solder is stored in the gap between the recess 43,
no problem.

The present invention is not limited to the above-described embodiment. For example, the lead 2 of the first contact 10
The third portion 25 of FIG. 2 may be omitted, and the lead portion may have a substantially L-shape. In this case, the mounting area on the PCB 29 can be further reduced. In addition, various changes can be made within the scope of the present invention.

[Brief description of the drawings]

FIGS. 1 (a) and 1 (b) are a plan view and a front view of a flexible board connector showing a state where a lid member is opened, respectively.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1, in which hatching of a cross section of each contact is omitted.

FIG. 3 is a cross-sectional view along the line III-III in FIG. 1, in which hatching in a cross section of each contact is omitted.

[Explanation of symbols]

 Reference Signs List 1 connector 2 FPC 4 housing 6 opening 7 lid member 10 first contact 11 second contact 12 lower plate 13 front end 15 fixing piece 17 connecting part 18 first elastic piece 22 lead part 23 first Part 24 second part 26 lower surface 27 concave part 29 PCB 30 front surface 33 fixing piece part 35 elastic piece part 36 connecting part 37 lead part 39 first part 41 second part 42 rear end 43 concave part 44, 45 conductor pattern A Projection space B area

Claims (2)

[Claims] A plurality of contacts arranged so as to face an opening of a housing opened upward, and a lid member capable of opening and closing the opening of the housing, wherein the contacts are opposed to the top and bottom of the housing. An elastic piece for pressing the flexible substrate and a fixing piece fixed to the housing groove of the housing, a connecting part for connecting these fixed pieces and the base ends of the elastic pieces, and extending from the connecting part. P
A connector for a flexible substrate including a lead portion soldered to a conductor pattern on a surface of a CB, wherein the contact is formed by punching out a press, and only the lead portion is a front end of a lower plate portion of a housing or Exposed at the rear end, the lead portion includes a first portion extending downward from the connecting portion, and a second portion extending from the first portion along a lower surface of the lower plate portion of the housing. And a lower plate portion of the housing is interposed between the second portion of the lead portion and the connecting portion, and is disposed in the vertical projection space of the lid member in the closed state. A flexible board connector characterized in that an upper portion of the portion is accommodated in a recess formed on a lower surface of a lower plate portion of the housing. 2. A mounting structure for a flexible board connector according to claim 1, wherein the conductive pattern formed on the surface of the PCB and connected to the lead portion comprises a housing and a closing member. A mounting structure for a connector for a flexible board, wherein the mounting structure is arranged in a region corresponding to a vertical projection space of a lid member in a state.