Connector

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Industrial application field]

The present invention relates to a connector, and more particularly to a connector in which a terminal is penetrated through a printed circuit board and soldered.

【0002】

[Conventional technology]

Conventional connectors include those shown in the perspective view of FIG. In this connector, the terminal 2 is projected from the resin connector board 1. Further, this connector is used by being mounted on the printed circuit board 3, and is mounted on the printed circuit board 3 and has one end of the terminal 2 penetrated through the printed circuit board 3 and protrudes through the terminal 2. This part is soldered to the printed circuit board 3 and connected to the circuit of the printed circuit board 3.

【0003】

Then, the terminal 2 protruding upward is connected by wiring to another electronic component or an electronic component mounted on the printed board 3.

【0004】

[Problems to be Solved by the Invention]

However, in the above-mentioned conventional connector, the coefficient of thermal expansion of the connector substrate 1 is usually about 5 times larger than that of the printed circuit board 3. Further, in an environment in which such a connector is used, electronic components generate heat when the power is on, and a cooling cycle is often repeated between the time when the power is off and the time when the power is off. Since the terminal 2 of the connector is solder-bonded to the printed circuit board 3, a large thermal stress is repeatedly generated at the solder-bonded portion, and cracks due to thermal fatigue may occur.

【0005】

The present invention has been made to solve the above problems, and an object of the present invention is to provide a connector that does not generate cracks even when used in an environment where a thermal cycle occurs. is there.

【0006】

[Means for solving problems]

In the invention according to claim 1, which solves the above problems, the terminal 2 is provided so as to project from the connector board 1, the connector board 2 is placed on the printed circuit board 3, and one end of the terminal 2 is penetrated through the printed circuit board 3. In the connector in which the protruding portion of the terminal 2 is soldered to the printed circuit board 3, the connector board 1 is divided into small blocks 4, and the small blocks 4 are connected via a stress relaxation gap. It is configured.

【0007】

The invention according to claim 2 is characterized in that the invention according to claim 1 has a notch 5 as a stress relaxation gap.

【0008】

The invention according to claim 3 is characterized in that the invention according to claim 1 has a groove 6 as a stress relaxation gap.

【0009】

The invention according to claim 4 is characterized in that, in the invention according to claim 1, a loose fitting portion 7 is provided as a stress relaxation gap.

【0010】

The invention according to claim 5 is the invention according to claim 1, wherein each small block 4 is arranged in the cassette 8 with a gap 9 between the small blocks 4, and is loosely fitted into the cassette 8 and the small block 4. It is characterized by being provided with a portion 9 and serving as a stress relaxation gap.

【0011】

[Action]

In the invention according to claim 1, since the stress generated in the thermal cycle environment is relaxed by the stress relaxation gap, the stress affects the individual small blocks 4 connected through the stress relaxation gap. There is less to do.

【0012】

In the invention according to claim 2, the portion corresponding to the extension line of the notch 5 of the connector substrate 1 is small, and this portion is easily deformed, so that the stress is relaxed.

【0013】

In the invention according to claim 3, the portion of the connector substrate 1 in which the groove 6 is formed is thin and easily deformed at this portion, so that the stress is relaxed.

【0014】

In the invention according to claim 4, since the small blocks 4 are connected to each other with play, the small blocks 4 can move by this play and the stress is relaxed.

【0015】

In the invention according to claim 5, there is a gap between the small blocks 4 so that the small blocks 4 can be moved, and the small blocks 4 are attached to the cassette 8 with play. Block 4 can move and stress is relieved.

【0016】

[Example]

An embodiment of the present invention will be described below with reference to the accompanying drawings.

【0017】

Example 1 will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view showing a connector of this embodiment, and FIG. 2 is a side view showing a state in which this connector is attached to a printed circuit board.

【0018】

In FIG. 1, reference numeral 1 denotes a resin connector substrate. On this connector board 1, a large number of terminals 2 having a quadrangular prism shape are arranged side by side in a state of protruding from the front and back. Further, a notch 5 is formed in the connector substrate 1. The notch 5 is formed in a direction in which each terminal 2 of the connector board 1 is separated, and is divided into small blocks 4 having one terminal 2 each. Further, the notch 5 serves as a stress relaxation gap, and each small block 4 is connected via the stress relaxation gap to form a connector.

【0019】

As shown in FIG. 2, the connector as described above is placed on the printed circuit board 3, and one end of the terminal 2 is passed through the terminal hole formed in the printed circuit board 3, so that the protruding portion 2a of the terminal 2 is formed. It is used by being soldered to the printed circuit board 3. At this soldered portion 2c, electrical continuity is performed with the circuit pattern of the printed circuit board 3. Further, the terminal 2 is connected by wiring from the protruding portion 2b to the front side to other electronic components or other parts of the printed circuit board 3.

【0020】

The connector used in this way usually has a coefficient of thermal expansion of the connector board 1 about 5 times larger than that of the printed circuit board 3. Then, in the usage environment of this connector, the electronic components generate heat when the power is on, the cooling and heating cycle is repeated between the time when the power is off, and the stress is repeatedly generated at each solder joint. ing.

【0021】

However, since the connector of this embodiment connects each small block 4 via a stress relaxation gap, the above stress is absorbed by the stress relaxation gap and is unlikely to affect each small block 4, and is individually present. Thermal fatigue is less likely to occur at the solder joints. Therefore, even in a cold-heat cycle environment, cracks are less likely to occur at the solder joint, and the connector is durable. That is, even if the connector substrate 1 is formed by injection molding or the like using a general-purpose resin material having a large coefficient of thermal expansion, the connector is sufficiently durable.

【0022】

In particular, in the case of this embodiment, the notch 5 is formed as a stress relaxation gap, the portion corresponding to the extension line of the notch 5 of the connector substrate 1 is small, and the connector substrate 1 is easily deformed at this portion. .. Therefore, the stress due to the above-mentioned thermal cycle is relaxed.

【0023】

Example 2 will be described with reference to FIG. 3, which is a perspective view of this embodiment. In this figure, reference numeral 6 denotes a groove formed as the stress relaxation gap described in the first embodiment. The groove 6 is formed at opposite positions on the front and back sides of the connector board 1 so as to divide the connector board 1 into small blocks 4 each having one terminal 2. Therefore, the portion of the connector substrate 1 in which the groove 6 is formed is thin, and this portion is easily deformed. Therefore, as in the first embodiment, the stress is relaxed and the connector is durable.

【0024】

Example 3 will be described with reference to FIGS. 4 to 7. 4 and 6 show perspective views of the connectors of this embodiment, respectively. 5 and 7 are perspective views showing independent small blocks 4 connected to each other to form the connector.

【0025】

The connector of this embodiment is characterized in that a loose fitting portion 7 is provided as a stress relaxation gap.

【0026】

In FIGS. 4 and 5, reference numeral 7 denotes a fitting portion composed of a convex portion 7a and a concave portion 7b, which are loosely fitted with a gap 7c. Further, the small block 4 is a rectangular plate having one terminal 2, and a protrusion 4a and a notch 4b are fitted to each other on both sides of the small block 4 to be connected, respectively. It is formed into rectangles of almost the same shape so that it is formed. Then, convex portions 7a are formed on both sides parallel to the protruding direction of the protruding portion 4a, and concave portions 7b are formed on both sides parallel to the notch direction of the notched portion 4b so as to be loosely fitted. It has become.

【0027】

The ones shown in FIGS. 6 and 7 have a loose fitting portion 7 different from that of FIGS. 4 and 5 above, and the protruding portion 4a and the cutout portion 4b are separated from the male fruit 4c and the female fruit, respectively. It is designated as 4d, and a convex portion 7a and a concave portion 7b are formed on the male fruit 4c and the female fruit 4d, respectively.

【0028】

Since the small blocks 4 having the loose fitting portion 7 as described above are connected to each other with play, the small blocks 4 can move by this play and the stress is relaxed. It is also a durable connector. Further, the small block 4 can be freely connected to an arbitrary length, and a connector having a desired length can be used.

【0029】

Example 4 will be described with reference to FIGS. 8 to 10. FIG. 8 shows a perspective view of the connector of this embodiment. 9 and 10 are perspective views showing the members constituting the connector, respectively, FIG. 9 shows a cassette 8 on which the small block 4 is placed and held, and FIG. 10 shows the small block 4.

【0030】

In the connector of this embodiment, the loose fitting portion 7 shown in the third embodiment as a stress relaxation gap is arranged in the cassette 8 with the respective small blocks 4 and the gap 9c between the small blocks 4 and the cassette. The free fitting portion 9 is provided with a convex portion 9a and a concave portion 9b that are loosely fitted to the 8 and the small block 4.

【0031】

As shown in FIG. 9, the cassette 8 is a case made of an insulating resin or the like, and has vertical pieces 8a and 8b in a direction parallel to the connecting direction of the small blocks 4, respectively. Then, convex portions 9a protruding inward are formed on the vertical pieces 8a and 8b, respectively. Further, the bottom portion of the cassette 8 on which the small block 4 is placed is hollowed out to form an opening 8c.

【0032】

As shown in FIG. 10, the small block 4 is a rectangular plate having one terminal 2, and recesses 9b are formed on both sides parallel to the connecting direction.

【0033】

The above connectors have a gap 9c between each small block 4 and are movable, and the small block 4 is attached to the cassette 8 with play, so this play is small. Block 4 can move and stress is relieved. Therefore, the connector is durable as in the above-described embodiment. Further, a cassette 8 having an arbitrary length can be prepared, and small blocks 4 having this length can be connected to form a connector having a desired length.

【0034】

[Effect of the invention]

In the invention according to claim 1, the stress due to the thermal cycle is less likely to be applied to the individual solder joints, and the occurrence of thermal fatigue is reduced. Therefore, even in a cold-heat cycle environment, cracks are less likely to occur in the solder joint, and the connector is durable.

【0035】

In the invention according to claim 2, the stress is relaxed by the notch in the connector substrate, and the effect according to claim 1 is achieved.

【0036】

In the invention according to claim 3, the stress is relaxed by the groove of the connector substrate, and the effect according to claim 1 is exhibited.

【0037】

In the invention according to claim 4, the stress is relaxed by the loose fitting portion between the small blocks, and the effect according to claim 1 is achieved. Further, an arbitrary number of small blocks can be connected to easily form a connector having an arbitrary length.

【0038】

In the invention according to claim 5, the small block is attached to the cassette with play, and the small block can move by this play to relieve the stress, and the effect according to claim 1 is achieved. Further, an arbitrary number of small blocks can be connected to easily form a connector having an arbitrary length according to the length of the cassette.

[Simple explanation of drawings]

[Figure 1]

It is a perspective view which shows the connector of Example 1 of this invention.

[Figure 2]

It is a side view which shows the state which attached the connector to the printed circuit board as above.

[Fig. 3]

It is a perspective view which shows the connector of Example 2 of this invention.

[Fig. 4]

It is a perspective view which shows the connector of Example 3 of this invention.

[Fig. 5]

It is a perspective view which shows one member of the connector as above.

[Fig. 6]

It is a perspective view which shows another connector of the said embodiment.

[Fig. 7]

It is a perspective view which shows one member of the connector as above.

[Fig. 8]

It is a perspective view which shows the connector of Example 4 of this invention.

[Fig. 9]

It is a perspective view which shows one member of the connector as above.

[Fig. 10]

It is a perspective view which shows one member of the connector as above.

[Fig. 11]

It is a perspective view which shows the connector of the conventional example.

[Explanation of symbols]

1 Connector board 2 terminals 3 printed circuit board 4 small blocks 5 notch 6 grooves 7 Fitting part 8 cassette 9 Free fit