JP3242590B2 - Board mounted electrical connector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a board-mounted electrical connector which is fixed to a circuit board by screws.

[0002]

2. Description of the Related Art Conventionally, there has been known a board-mounted electrical connector which is fixed to a circuit board by a bolt screw and a nut member screwed thereto. One example is 5-759
No. 74. The housing of the disclosed electrical connector is provided with a screw hole for inserting and receiving a bolt screw for screw fixing to a circuit board, and a nut receiving portion for receiving a nut member screwed to the bolt screw.

[0003]

SUMMARY OF THE INVENTION A board-mounted electrical connector includes:
In order to facilitate the work of attaching to a substrate and to lower the manufacturing cost, it is required to reduce the required number of parts as much as possible. A first object of the present invention is to provide a board-mounted electrical connector in which the number of nut members is reduced and the board-mounting means is configured with a smaller number of components.

Further, at this time, it is desirable that the board-mounted electrical connector, which can reduce the number of nut members, be configured so that the nut members can be used when it is necessary for the convenience of the production line or the work of the operator. It is. Accordingly, a second object of the present invention is to provide a board-mounted electrical connector in which the board mounting means can be selected.

[0005]

SUMMARY OF THE INVENTION According to the present invention, there is provided a screw hole capable of receiving a bolt screw, and a nut accommodating portion accommodating a nut member screwed to the bolt screw at a position concentric with the screw hole. A board-mounted electrical connector including a formed housing and receiving the bolt screw in the screw hole and capable of screwing the housing to a circuit board.
The screw hole has a relatively large diameter portion located on the circuit board side, a relatively small diameter portion located on the nut accommodating portion side and formed concentrically with the large diameter portion, And an intermediate portion at an intermediate position of the small diameter portion,
In the intermediate portion, a plurality of protrusions are provided along the circumferential direction with a gap between the adjacent protrusions, and the protrusion height of the protrusions corresponds to the inner surface of the small diameter portion. The height is set so as not to exceed, and the small diameter portion is capable of inserting the bolt screw and being screwable with another bolt screw having a larger diameter than the bolt screw.

[0006]

[0007]

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 1A and 1B show a board-mounted electrical connector, wherein FIG. 1A is a plan view and FIG. 1B is a side view. In particular, FIG.
In (b), a circuit board to which the board-mounted electrical connector is attached is virtually shown. According to FIG. 1, a board-mounted electrical connector (hereinafter simply referred to as an electrical connector) 10 including a housing 20 and a plurality of contacts 30.
Is a card connector for receiving a card such as a memory card. A card receiving portion 21 is formed in the housing 20, and the card received by the card receiving portion 21 and the contacts 30 are electrically connected. The housing 20 is mounted on the side surface 22 of the housing 20 by the circuit board 5.
A reinforcing metal fitting 40 for firmly fixing by soldering is fitted to the metal.

The contacts 30 and the reinforcing members 40 are provided with SMT type (surface mount type) soldering portions 35 and 45, respectively. The electric connector 10 is mounted on the circuit board 5 as shown in FIG. 1B, and the soldering portions 35 and 45 are soldered to pads (not shown) provided on the circuit board 5. Before the soldering step in the manufacturing process, the housing 20 of the electrical connector 10 is fixed on the circuit board 5 only by screws. The housing 20 is provided with a screw hole 50 for receiving the screw (not shown). Hereinafter, the details of the screw fixing using the screw holes 50 will be described.

FIG. 2 is a bottom view of a screw hole portion of the electric connector of FIG. FIG. 3 is a sectional view of a screw hole.
(A) is a cross-sectional view taken along line AA, and (b) is a line BB.
It is sectional drawing of a direction. However, the structure around the screw hole 50 is omitted in FIG. According to FIG. 3A, a nut housing portion 25 capable of housing a nut member to be screwed with a relatively small diameter bolt screw described later is formed on the top side of the screw hole 50 of the housing 20. The width W of the nut accommodating portion 25 is set so as to prevent rotation of the nut member having a substantially hexagonal outer shape. Further, when the nut accommodating portion 25 accommodates a nut member described later, the nut member and the screw hole 50 are arranged substantially concentrically.

2 and 3 (a) and 3 (b), the screw hole 50 is located on the top side, that is, a relatively large-diameter portion 60 located on the circuit board 5 side, ie, on the nut receiving section 25 side. It has a relatively small diameter portion 70 located. An inclined guide surface 61 is formed at the bottom edge of the large diameter portion 60 to guide reception of a bolt screw described later.

As shown in the figure, an intermediate portion 80 having a plurality of protrusions 85 and a first inclined surface 81 is provided at an intermediate position between the large-diameter portion 60 and the small-diameter portion 70 in the screw hole 50. Can be The first inclined surface 81 compensates for the difference in diameter between the large-diameter portion 60 and the small-diameter portion 70 to make them continuous, and the projection 85
Is connected to the inclined surface 81. As can be seen from FIG. 2, the protrusion 85 bulges from a surface position corresponding to the inner surface of the large diameter portion 60 and includes a substantially flat side surface 86. Each of the two pairs of protrusions 85 arranged in the orthogonal direction has a screw hole 50.
Are provided so as to form a circumferential gap 88 between the adjacent protruding portion 85 at a position facing the inside. The height of the protrusion 85 is such that the side surface 86 does not exceed the inner surface of the small-diameter portion 70. As shown, a portion of the side surface 86 and an inner surface of the small diameter portion 70 may coincide. Further, a second inclined surface 87 substantially parallel to the first inclined surface 81 is formed on the bottom side of the protrusion 85.

The operation of the above configuration will be described with reference to FIGS. FIG. 4 is a cross-sectional view showing the periphery of the screw hole 50 of the housing 20 and a circuit board, together with a relatively small-diameter bolt screw and a nut member screwed thereto.
(A) is a figure which shows the state before assembly, (b) is a figure which shows the state at the time of completion of assembly. FIG. 5 is a cross-sectional view showing a peripheral portion of the screw hole 50 of the housing 20 and a circuit board together with a bolt screw having a relatively large diameter.
FIG. 7B is a diagram showing a state before assembling, FIG. 7B is a diagram showing a state in the middle of assembling, and FIG. FIGS. 4 and 5 show the housing in a cross section along the line BB in FIG.

The electrical connector 10 is screwed to the circuit board by any of the fixing methods shown in FIGS. That is, the assembling operator can select one of the methods in FIG. 4 or FIG. According to the method shown in FIG. 5, the number of parts can be reduced, and the mounting operation can be easily performed. On the other hand, according to the method shown in FIG. 4, although the number of parts is increased, there is an advantage that mounting and dismounting can be freely performed a plurality of times. For example, when it is necessary to mount the electrical connector 10 on the circuit board 5 on a test basis, the latter method is advantageous.

According to the method shown in FIG.
A relatively small diameter bolt screw 100 and a nut member 150 are used to fix the housing 20 with screws. The diameter D1 of the screw portion 110 of the bolt screw 100 is smaller than the inner diameter of the small-diameter portion 70 of the screw hole 50, so that the screw portion 110 can be inserted through the screw hole 50 without screwing or engaging with the screw hole 50. Is chosen. Therefore, the bolt screw 100 is inserted into the through hole 7 and the screw hole 50 of the corresponding size formed in the circuit board 5 without screwing or engaging.
(The insertion direction is indicated by an arrow X in FIG. 4A.) However, the small-diameter portion 70 acts to regulate the bolt screw 100 so as not to be loose. The bolt screw 100 is smoothly guided by the guide surface 61 and the first and second inclined surfaces 81 and 87. The bolt screw 100 is then screwed into the nut member 150, which is stopped in the nut receiving portion 25, thereby fixing the housing 20 on the circuit board 5 as shown in FIG.

According to the method shown in FIG.
A relatively large-diameter bolt screw 200 is used for fixing the housing 20 to the screw. Screw part 2 of bolt screw 200
The diameter D <b> 2 of the screw 10 is smaller than the large diameter portion 60 of the screw hole 50 and can be screwed into the small diameter portion 70.
Accordingly, when the bolt screw 200 is inserted through the through hole 8 of a corresponding size formed in the circuit board 5 (the insertion direction is indicated by an arrow X in FIG. 5A), the screw portion 210 of the bolt screw 200 is turned. First, the large-diameter portion 60 in the screw hole 50 penetrates without being screwed or engaged, and the tip 220 reaches the intermediate portion 80 as shown in FIG. At this time, as in the case of FIG.
Guides you to enter 0. After that, by rotating the bolt screw 200, the screw portion 210 starts to bite into the intermediate portion 80 and the small diameter portion 70 of the screw hole 50. At this time, the screw hole 50 is formed due to the second inclined surface 87 of the protrusion 85 for aligning the bolt screw 200 to the center position and the gap 88 (see FIG. 2) defined by the protrusion 85.
Engagement is performed smoothly. In particular, the latter reduces the force required at the beginning of the engagement of the bolt screw 200 and provides a clearance for resin shavings generated by the engagement. Thereafter, the bolt screw 200 is further rotated to advance the screwing between the screw portion 210 and the small-diameter portion 70, and as shown in FIG.
0 can be screw-fixed to the circuit board 5.

As described above, the board-mounted electrical connector according to the preferred embodiment of the present invention has been described. However, this is merely an example, and does not limit the present invention. Deformation and change are possible.

[0019]

According to the board-mounted electrical connector of the present invention, a screw hole capable of receiving a bolt screw for screwing the housing to the circuit board has a relatively large diameter portion and is concentric with the large diameter portion. And a relatively small diameter portion formed in the screw hole, and the small diameter portion of the screw hole is screwed together with another relatively large diameter bolt screw so that the housing can be fixed to the circuit board. It is not necessary to use a nut member for fixing the slab, the number of parts is reduced, the assembling work can be easily performed, and the manufacturing cost is reduced. Furthermore, according to the board-mounted electrical connector of the present invention,
It is possible to select whether or not to use the nut member for the sake of the production line or the work of the operator, so that the assembling work can be given a degree of freedom.

[Brief description of the drawings]

FIG. 1 is a diagram showing a board-mounted electrical connector;
(A) is a plan view, (b) is a side view.

FIG. 2 is a partial bottom view of a screw hole of the electrical connector of FIG. 1;

FIG. 3 is a sectional view of a screw hole, in which (a) is a line AA
The figure which shows the cross section of a direction, and (b) is the figure which shows the cross section of the line BB direction.

FIG. 4 is a cross-sectional view showing a peripheral portion of a screw hole of a housing and a circuit board together with a bolt screw having a relatively small diameter and a nut member screwed thereto, wherein (a) shows a state before assembly. (B) is a diagram showing a state at the time of completion of assembly.

5A and 5B are cross-sectional views showing a peripheral portion of a screw hole of a housing and a circuit board together with a bolt screw having a relatively large diameter, and FIG. 5A is a view showing a state before assembly;
(B) is a figure which shows the state in the middle of assembly, and (c) is a figure which shows the state at the time of completion of assembly.

[Explanation of symbols]

5 Circuit Board 10 Board-Mounted Electrical Connector 20 Housing 25 Nut Housing 50 Screw Hole 60 Large Diameter 70 Small Diameter 100 Bolt Screw (Small Bolt Screw) 150 Nut Member 200 Other Bolt Screw (Large Bolt Screw) )

Claims (1)

(57) [Claims] 1. A housing having a screw hole capable of receiving a bolt screw, and a nut accommodating portion capable of accommodating a nut member screwed to the bolt screw at a position concentric with the screw hole. A board-mounted electrical connector capable of receiving the bolt screw in a screw hole and screw-fixing the housing to a circuit board, wherein the screw hole has a relatively large-diameter portion located on the circuit board side and the nut A relatively small-diameter portion located on the accommodation portion side and formed concentrically with the large-diameter portion, and an intermediate portion at an intermediate position between the large-diameter portion and the small-diameter portion; A plurality of protrusions are provided along the circumferential direction with a gap between the adjacent protrusions, and the protrusion height of the protrusions is a height not exceeding the inner surface of the small diameter portion. Set, the small diameter portion is the bolt A board-mounted electrical connector, which is capable of inserting a screw and being screwable with another bolt screw having a larger diameter than the bolt screw.