JP2002270270A - Pressure-contact connector and its connection mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure-contact connector and its connection mechanism by which connection with a low load with reduced height and shortened conductive passage is made possible. SOLUTION: A cap type conductive toe-pin 9 exposed from the bottom face of a housing 1 inserted into a penetrating hole 4 of the housing 1 interposed between a first and a second electric joinings and a conductive head-pin 11 inserted into the toe-pin 9 and protruding from the top face of the housing 1 in free sliding are provided. Then, the conductive head-pin 11 is clamped down and biased toward upside of the housing 1 with a coil spring 14 interposed between the conductive toe-pin 9 and the conductive head-pin 11, a top end face 13 of the conductive head-pin 11 is made slanted at a given angle against the plane orthogonal to the axis line of the penetrating hole 4 of the housing 1 to have the conductive head-pin in contact with the inner peripheral face of the conductive toe-pin 9 in a slanted state, and the conductive toe-pin 9 and the conductive head-pin 11 in contact are to be a conductive passage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a mobile phone and a PDA.
Electrical connection between liquid crystal panels (COG, COF) used for the display unit of small communication equipment such as, and other electronic equipment and circuit boards, or electrical connection between circuit boards inside equipment
The present invention relates to a pressure contact type connector used for (FPC-PCB, PCB-PCB) and the like, and a connection structure thereof.

[0002]

2. Description of the Related Art Conventionally, when a circuit board for a cellular phone and a liquid crystal module are electrically connected to each other, a pressure contact type in which a plurality of conductive metal wires are arranged on a surface of an elastic elastomer having a substantially semi-oval cross section is provided. You are using a connector. Specifically, a press-fit connector is sandwiched between the circuit board and the liquid crystal module, the liquid crystal module is pressed against the circuit board to compress the press-fit connector, and a conductive metal wire connects the circuit board and the liquid crystal module. ing.

[0003]

By the way, in recent years, portable telephones have been intensively reduced in thickness, size, and weight, and accordingly, it is necessary to reduce the height of the press-connecting connector. However, since the conventional press-connecting connector is configured as described above, the height dimension (5 m
m) is extremely difficult to reduce, so that the conduction path cannot be shortened. Further, there is a strong demand for press-connecting connectors to be connected with a low load.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and has as its object to provide a press-contact type connector which can be connected even with a low load by shortening a height dimension to shorten a conduction path and a connection structure thereof. I have.

[0005]

According to the present invention, in order to achieve the above object, a hollow conductive toe pin inserted into a through hole of a housing and exposed from one surface of the housing is provided. A conductive head pin that is fitted and slidably protrudes from the other surface of the housing, wherein at least the conductive head pin is interposed between the conductive toe pin and the conductive head pin via a spring member. The tip of the conductive head pin was inclined at a predetermined angle with respect to a plane perpendicular to the axis of the through-hole of the housing, and the conductive head pin was inclined in the conductive toe pin. The conductive toe pins and the conductive head pins that are in contact with each other are used as conductive paths.

A flange is projected outward from the outer peripheral surface of the conductive toe pin and the conductive head pin, and a coil spring is interposed between the plurality of flanges.
The predetermined angle at the tip of the conductive head pin is 3 °
It is preferable to set it to 30 °. According to a third aspect of the present invention, in order to achieve the above object, the press-connecting connector according to the first or second aspect is interposed between the opposing electrodes so as to conduct electricity. .

Here, the housing in the claims can be freely changed to a rectangle, a square, an oval, or the like. The housing may have one or more through holes. The conductive toe pin may protrude as long as it is exposed from one surface of the housing, or may protrude and be slidable by a spring member. The spring member is mainly a coil spring, but if a similar function can be expected, other types of springs can be selected. Further, as an electrical joint having electrodes, at least various types of circuit boards (for example, printed boards, flexible boards, build-up wiring boards, inspection circuit boards), liquid crystal displays, electro-acoustic components (for example, speakers and various microphones) ), Various IC packages, and the like.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1 to FIG. Insulating housing 1 interposed between joints
And a cap-shaped conductive toe pin 9 inserted into each of the plurality of through holes 4 of the housing 1 and exposed from the lower surface of the housing 1, and fitted into each of the conductive toe pins 9 through a slight gap, and A conductive coil spring 1 between each conductive toe pin 9 and the conductive head pin 11.
4, each conductive head pin 11 is elastically urged upward in the housing 1.

Although not shown, for example, a circuit board of a mobile phone is used as the first electrical joint. Although not shown, for example, a liquid crystal module of a mobile phone is used as the second electric junction. Opposing electrodes are formed side by side on the opposing surfaces of the first and second electric joints, and the conductive toe pins 9 and the conductive head pins 11 come into contact with the plurality of opposing electrodes, thereby providing electrical conduction. Is secured.

As shown in FIGS. 1 to 3, the housing 1 is formed in a flat rectangular shape by laminating a pair of thin and thin plate plates 2 and 3 one above the other, and has a small diameter penetrating in the longitudinal direction. The holes 4 have a predetermined pitch (for example, 0.
5 to 1.27 mm).
Positioning pins (not shown) pointing downward are selectively implanted at both ends of the housing 1, and each positioning pin is inserted into a positioning hole of the first electric joint, The housing 1 is positioned and fixed. Each of the plate plates 2 and 3 is formed into a plate shape using a general-purpose engineering plastic excellent in heat resistance, dimensional stability, moldability, etc., specifically, ABS resin, polycarbonate, polypropylene, PVC, polyethylene, or the like. I have.
Among these materials, ABS with excellent workability and cost
Resin is best.

As shown in FIGS. 1 and 2, each through hole 4
A diameter-reduced hole 5 drilled in the lower plate 2, a diameter-increased hole 6 continuous above the diameter-reduced hole 5 via a step, and a hole of the lower plate 2 drilled in the upper plate 3. A large diameter hole 7 is formed continuously with the large diameter hole 6, and a small diameter hole 8 is formed above the large diameter hole 7 and continues through a step.

As shown in FIGS. 1 and 2, each conductive toe pin 9 is made of a gold-plated conductive material such as copper, brass, or the like.
It is formed in a bottomed cylindrical shape having a substantially U-shaped cross section using aluminum or the like. The flat bottom surface of this hollow conductive toe pin 9 is slightly (for example, from the bottom surface of the plate plate 2 below).
(0.1 to 1.5 mm, preferably about 0.1 to 1.0 mm).
It is fixed via F or the like to ensure conduction. A ring-shaped flange 10 protrudes radially outward from a lower portion of the outer peripheral surface of the conductive toe pin 9.
The lowering and dropping of the conductive toe pin 9 is effectively restricted by locking the stepped portion between the reduced diameter hole 5 and the enlarged diameter hole 6.

Each conductive head pin 11 is shown in FIGS.
As shown in FIG. 2, the conductive material is basically formed in a cylindrical shape using a gold-plated conductive material such as copper, brass, and aluminum. A ring-shaped flange 12 projects radially outward from the outer peripheral surface of the conductive head pin 11, and this flange 12 is engaged with a stepped portion between the large-diameter hole 7 and the small-diameter hole 8 of the plate plate 3, so that the conductive head pin 11 becomes conductive. The detachment of the head pin 11 is restricted. The upper portion of the conductive head pin 11 is separated from the upper plate 3 (for example, 0.1 to 1.5).
mm, preferably about 0.1 to 1.0 mm) and resiliently contacts the electrode of the second electrical joint to ensure conduction. The upper end surface 13 which is the tip of the conductive head pin 11 has a through hole 4
3 ° to 30 °, preferably 10 ° to 20 °, more preferably about 15 ° with respect to a plane perpendicular to the axis of
A portion inclined obliquely at an angle θ of ° and deviated radially outward from the center portion elastically contacts the electrode of the second electrical joint.

Further, each coil spring 14 is made of phosphor bronze,
It is formed using copper, stainless steel, beryllium copper, piano wire, or a thin metal wire obtained by plating these wires with gold, and is inserted between the conductive toe pin 9 and the conductive head pin 11 to be provided between these flanges 10 and 12. Intervened. The coil spring 14 is made of a thin metal wire having a diameter of 30 to 100 μm, preferably 30 to 80 μm, for example, 50 μm.
It is formed into a simple structure by being wound at an equal pitch of m, and generates a load of 30 to 60 g at the time of compression of 0.5 mm, for example. The diameter of the coil spring 14 is 30 to 100 μm
The reason is that if this range is selected, low cost and low load connection can be easily realized. The load at the time of compression of the coil spring 14 is appropriately selected according to the connection status.

The length of each coil spring 14 is 0.5
が 3.0 mm, preferably about 1.0-1.5 mm. This is because, within this range, adverse effects due to external noise can be avoided and elastic characteristics can be maintained.

In the above configuration, when the first and second electric joints are conducted, the press-connecting connector is positioned and fixed to the first electric joint, and the first and second electric joints are positioned between the first and second electric joints. The press-connecting connector may be sandwiched, and the second electric joint may be slightly pressed against the first electric joint. Then, the conductive head pin 11 descends against the coil spring 14 and contacts the inner peripheral surface of the conductive toe pin 9 in a state where the peripheral surface of the conductive head pin 11 is very slightly inclined. 11 forms a current conduction path without passing through the coil spring 14 which causes high resistance, thereby conducting the first and second electric joints.

According to the above configuration, the conductive head pin 11 and the coil spring 14 are integrated, and the conductive head pin 11 is fitted into the conductive toe pin 9 so as to be able to reciprocate. Therefore, the height dimension is extremely small (for example, 1.50). (About 2.00 mm)
And thereby the conduction path can be shortened. In addition, by inclining the upper end surface 13 of the conductive head pin 11 at a predetermined angle θ, the conductive head pin 11 is brought into contact with the conductive toe pin 9 not vertically but at the time of connection in a state where the position of the center of gravity is shifted, thereby preventing poor contact However, a conductive path having low resistance can be formed by the conductive toe pin 9 and the conductive head pin 11. Therefore, unlike the case where the long coil spring 14 wound spirally is used as the conduction path, the conduction path can be shortened, and the inductance can be significantly reduced, that is, excellent high-frequency characteristics can be realized. Specifically, a stable low resistance and low load connection (for example, about 30 to 60 g / pin) of about 1/3 of the conventional one can be greatly expected.

Further, since the conductive head pin 11 rubs inside the conductive toe pin 9 in a contact state, a cleaning effect of quickly removing dust and oxide film adhered to the contact portion can be obtained with a simple configuration. In addition, since the coil spring 14 is supported by the flanges 10 and 12 of the conductive toe pin 9 and the conductive head pin 11, assembly is extremely easy. Further, since the housing 1 is interposed between the first and second electric joints, the press-connecting connector can be easily incorporated or mounted on the first electric joint itself,
It becomes possible to greatly improve positioning accuracy and assemblability. Furthermore, since the press-contact type connector is assembled by sandwiching the conductive portion between the pair of plate plates 2 and 3 from above and below, the conductive toe pin 9 and the conductive head pin 1 have a simple configuration.
1. It is possible to very effectively suppress and prevent displacement, drop-out, dropout and the like of the coil spring 14.

In the above-described embodiment, the through holes 4 are arranged in one row in the longitudinal direction of the housing 1. However, the arrangement can be freely changed to two rows, three rows, four rows, or the like. Further, the number of the conductive toe pins 9 and the conductive head pins 11 can be appropriately increased or decreased. In addition, although the conductive toe pin 9 having a U-shaped cross section and a bottomed cylindrical shape is shown, the present invention is not limited to this. For example, the hollow conductive toe pin 9 can be formed into a bottomed rectangular tube or the like, or the bottom of the conductive toe pin 9 can be appropriately changed to a conical shape, a truncated conical shape, a substantially semicircular cross section, or the like. Further, when a hole is formed in the bottom of the conductive toe pin 9 during manufacturing and the inside of the conductive toe pin 9 is plated with gold using this hole, the gold plating can be easily performed. Further, the flange 10 may be protruded outward from an upper portion of the outer peripheral surface of the conductive toe pin 9 or the like. Further, the conductive head pin 1
1 may be formed into a prismatic shape or the like, or may be formed in a hollow shape instead of a solid shape.

[0020]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a press-fit type connector and a connection structure according to the present invention. Example A press-fit connector shown in FIGS. 1 to 5 was sandwiched between a pair of circuit boards, and the pair of circuit boards were compressed and made conductive.
The relationship between the conduction resistance per pin and the compressive load at this time is summarized in the graph of FIG.

The press-connecting type connector has a total height of 1.75 mm.
The housing is made of ABS resin and has a height of 0.95.
mm. The number of pins consisting of a conductive toe pin and a conductive head pin was five, and they were arranged in the housing at a pitch of 1.5 mm. The conductive head pins had a height of 0.75 mm and the upper end surface 13 was inclined at an angle of 15 °. At the time of conduction, the pins were divided into 1 pin, 2 pins, 3 pins, 4 pins, and 5 pins, and the conduction resistance of each pin was measured. As a result, the conduction path of the current is only the conductive toe pin and the conductive head pin, and is not affected by the amount of compression, has substantially the same conduction resistance, and is used stably (10 Au-Au connection).
0 mΩ or less).

[0022]

As described above, according to the present invention, there is an effect that the conductive path can be shortened by reducing the height and the connection can be performed with a low load.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional explanatory view showing an embodiment of a press contact type connector according to the present invention.

FIG. 2 is an explanatory sectional view of a main part showing an embodiment of a press-connecting type connector according to the present invention.

FIG. 3 is a plan view showing an embodiment of a press contact type connector according to the present invention.

FIG. 4 is an explanatory view showing a conductive head pin in the embodiment of the press-connecting connector according to the present invention.

FIG. 5 is a plan view of FIG. 4;

FIG. 6 is a graph showing an embodiment of a press-connecting connector and a connection structure thereof according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 2 Plate plate 3 Plate plate 4 Through-hole 9 Conductive toe pin 10 Flange 11 Conductive head pin 12 Flange 13 Upper end surface (tip part) 14 Coil spring (spring member)

Claims (3)

[Claims] A hollow conductive toe pin inserted into a through hole of a housing and exposed from one surface of the housing, and a conductive head pin fitted into the conductive toe pin and slidably protruding from the other surface of the housing. A pressure contact type connector comprising: a spring member interposed between the conductive toe pin and the conductive head pin to force at least the conductive head pin toward the other surface of the housing; and an axis of a through hole of the housing. The tip of the conductive head pin is inclined at a predetermined angle with respect to a plane perpendicular to the plane, and the conductive head pin is brought into contact with the conductive toe pin in a tilted state. A press-fit type connector characterized by the following. 2. A flange is projected outwardly from an outer peripheral surface of each of the conductive toe pin and the conductive head pin, and a coil spring is interposed between the plurality of flanges. ° to 30
The press-connecting connector according to claim 1, wherein 3. The method according to claim 1, wherein the electrodes are opposed to each other.
A connection structure for a press-connecting connector, wherein the connection is made via the press-connecting connector described above.