JP3360543B2 - Connection structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure provided with a circuit board and a shield case and used for an electronic tuner for a TV or the like.

[0002]

2. Description of the Related Art The structure of a conventional connection structure will be described with reference to FIG.

In FIG. 7, reference numeral 21 denotes a connection structure, which includes a circuit board 22 and a shield case 23. The circuit board 22 is formed by molding an epoxy resin or the like. A conductor pattern (not shown) is formed on one main surface 22a, and a circuit element (not shown) is mounted on the other main surface 22b. Is done. On the other hand, the shield case 23 is formed by molding a metal plate into a substantially rectangular shape, and is disposed so as to surround the edge of the circuit board 22. A partition plate 24 for separating each circuit block formed on the circuit board 22 is provided inside the shield case 23, and a tongue 27 defined by a pair of cuts 25 and 26 is provided at an edge. A plurality is provided.

[0004] Then, as shown in FIG.
Is fitted into the shield case 23 with one main surface 22a exposed in the drawing. Here, as shown in FIG. 9, a cut 25 that defines the tongue piece 27 of the shield case 23,
26 crosses the circuit board 22 in the thickness direction, and has bottom portions 25a and 26a below the other main surface 22b in the drawing, so that the tongue piece 27 straddles the circuit board 22 in the thickness direction. Will be placed. Next, the circuit board 22 and the shield case 23 are temporarily fixed via the tongue piece 27 by bending the tongue piece 27 inside the shield case 23, and the circuit board 22 and the temporarily fixed circuit board 22 The shield case 23 is immersed in a solder bath (not shown), and the solder 28 adheres between the tongue piece 27 and the circuit board 22 as shown in FIG. 23 are electrically connected to each other to form a connection structure 21.

[0005]

However, in the connection structure 21 thus configured, the shield case 2
Since the tongue piece 27 provided on the circuit board 3 straddles the circuit board 22 in the thickness direction, when the tongue piece 27 is bent to temporarily fix the circuit board 22, as shown by an arrow A in FIG. Is stressed,
There is a possibility that the circuit element mounted on the circuit board 22 may be bent and the mounted circuit element may fall off or the conductor pattern may peel off.

Accordingly, in the present invention, when the tongue of the shield case is bent and the circuit board is temporarily fixed, the stress applied to the circuit board is small, so that the circuit element mounted on the circuit board may fall off. It is another object of the present invention to provide a connection structure in which a conductor pattern on a circuit board does not peel off.

[0007]

In order to achieve the above object, a connecting structure according to the present invention comprises a circuit board having a conductor pattern formed on one main surface, and a circuit board surrounding a side surface of the circuit board. A connecting tongue defined by a pair of cuts having a bottom at a position shallower than a position in contact with one main surface of the circuit board at an edge of the shield case, and one of the circuit boards A fixing tongue defined by a pair of cuts having a bottom is provided at a position in contact with the main surface or a position in contact with an intermediate portion in the thickness direction of the circuit board, and a conductor pattern on one main surface of the circuit board is provided. Are not supported by the fixing tongue, and the conductor pattern on one main surface of the circuit board and the shield case are electrically connected to each other through the connection tongue. Characterized by comprising connected to.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of a connection structure according to an embodiment of the present invention will be described with reference to FIG.

In FIG. 1, reference numeral 1 denotes a connection structure, which comprises a circuit board 2 and a shield case 3. The circuit board 2 is formed by molding an insulator such as an epoxy resin, and has a conductor pattern (not shown) formed on one main surface 2a and a circuit element (not shown) formed on the other main surface 2b. ) Is installed. On the other hand, the shield case 3 is made of metal, has a substantially rectangular shape, and is arranged so as to surround the edge of the circuit board 2. A partition plate 4 for separating each circuit block formed on the circuit board 2 is provided inside the shield case 3, and a connecting tongue 7 defined by a pair of cuts 5, 6 at an edge. , And a plurality of fixing tongue pieces 10 each defined by a pair of cuts 8 and 9. Here, the number of the fixing tongue pieces 10 provided is smaller than that of the connecting tongue pieces 7.

Then, as shown in FIG.
Is fitted into the shield case 3 with one main surface 2a exposed in the drawing. Here, as shown in FIG. 3, cuts 5, 6 for defining connection tongue pieces 7 of shield case 3 are provided.
Are located on the edge of the shield case 3 at a position shallower than the position corresponding to the one main surface 2a of the circuit board 2, respectively.
a, 6a, so that the connecting tongue 7 is formed above the one main surface 2a of the circuit board 2 in the drawing. On the other hand, as shown in FIG. 4, the cuts 8 and 9 that define the fixing tongue pieces 10 are provided with bottom portions 8 a and 9 a at positions corresponding to the middle of the circuit board 2 in the thickness direction at the edge of the shield case 3. Therefore, the fixing tongue piece 10 is formed such that a relatively small portion near the base thereof is in contact with the middle of the circuit board 2 in the thickness direction.

Next, as shown in FIG. 5, the connecting tongue 7 and the fixing tongue 10 are each bent inside the shield case 3. Here, one main surface 2 of the circuit board 2
In FIG. 5A, a portion of the conductor pattern is provided in advance in a portion close to the connecting tongue piece 7, and no conductor pattern is provided in a portion close to the bent fixing tongue piece 10. The bent inner portion of the connecting tongue 7 approaches the conductor pattern on the one main surface 2a of the circuit board 2, but does not make contact. On the other hand, the inside portion of the bent fixing tongue piece 10 is connected to one main surface 2 a
Abut on a portion where the conductor pattern is not provided. As a result, the circuit board 2 is supported by the fixing tongue 10 and is temporarily fixed inside the shield case 3.

Further, the shield case 3 and the circuit board 2 temporarily fixed as described above are immersed in a solder bath (not shown), and the connection tongue 7 and the conductor pattern adjacent to the connection tongue 7 are formed. When the solder 11 adheres between the conductive patterns, the conductor pattern of the circuit board 2 and the shield case 3 are electrically connected. On the other hand, solder (not shown) also adheres to the fixing tongue 10, but since a conductor pattern is not provided in a portion adjacent to the fixing tongue 10, the fixing tongue 10 is not provided.
No electrical connection is made. In this way,
The connection structure 1 is formed.

As described above, in the connection structure 1, the connection tongue 7 of the shield case 3 is formed above the one main surface 2 a of the circuit board 2 in advance and is not in contact with the circuit board 2. When the tongue piece 7 is bent, no stress is applied to the circuit board 2. In addition, the fixing tongue piece 10
Is formed in advance so that a relatively small portion near the base thereof is in contact with the circuit board 2, and the stress applied to the circuit board 2 at the time of bending is relatively small. Moreover, since the number of fixing tongue pieces 10 provided is relatively small, the stress on the circuit board 2 is further reduced. For these reasons, the circuit board 2 does not bend due to the bending of the connecting tongue piece 7 and the fixing tongue piece 10, and the circuit elements mounted on the circuit board 2 fall off or the conductor pattern peels off. There is no fear.

The fixing tongue piece may have a shape as shown in FIG. 6 in addition to the one described in the above embodiment.
That is, in FIG. 6, the fixing tongue piece 12 provided on the shield case 3 is defined by the cuts 13 and 14. The bottoms 13a, 14a of the cuts 13, 14 are
Each is provided at the edge of the shield case 3 so as to be located on the same plane as the one main surface 2 a of the circuit board 2.
Therefore, the fixing tongue pieces 12 are arranged without contacting the circuit board 2. And the fixing tongue piece 12
Temporarily fixes the circuit board 2 by being bent. The shield case 3 is provided with a connecting tongue 7 shown in FIG. 3 together with the fixing tongue 12, and the connecting tongue 7 is bent and soldered to the conductor pattern of the circuit board 2. As described above, the fixing tongue piece 12 includes the circuit board 2.
Since there is no portion in contact with the circuit board 2, the stress applied to the circuit board 2 when the fixing tongue piece 12 is bent is extremely small, and the circuit board 2 does not bend. Further, by reducing the number of the fixing tongue pieces 12, the stress applied to the circuit board 2 is further reduced.

In the embodiment of the present invention, it goes without saying that the number of tongue pieces provided on the shield case is not limited to the number shown in the above embodiment.

[0016]

In the connection structure according to the present invention, the connection tongue of the shield case is formed in advance above one main surface of the circuit board and is not in contact with the circuit board, so that the connection tongue is bent. At this time, no stress is applied to the circuit board. In addition, the fixing tongue is formed such that there is no portion in contact with the circuit board in advance, or only a relatively small portion near the root thereof is in contact with the circuit board. Thus, the stress applied to the circuit board is small. Also, by reducing the number of fixing tongue pieces, the stress on the circuit board due to bending is further reduced. For these reasons, the circuit board is not bent by the bending of each tongue piece, and there is no possibility that the circuit element mounted on the circuit board falls off or the conductor pattern peels off.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a connection structure according to one embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which a circuit board constituting the connection structure of FIG. 1 is fitted into a shield case.

FIG. 3 is an enlarged side view of a main part showing a connecting tongue provided in the connecting structure of FIG. 1;

FIG. 4 is an enlarged side view of a main part showing a fixing tongue provided in the connecting structure of FIG. 1;

FIG. 5 is a cross-sectional view of the connecting structure of FIG.
It is a perspective view which shows the state which soldered.

FIG. 6 is a main part enlarged side view showing a fixing tongue provided in a connection structure according to another embodiment of the present invention.

FIG. 7 is an exploded perspective view showing a conventional connection structure.

FIG. 8 is a perspective view showing a state in which a circuit board constituting the connection structure of FIG. 7 is fitted into a shield case.

9 is an enlarged side view of a main part showing a tongue piece provided in the connection structure of FIG. 7;

FIG. 10 is a sectional view of the connecting structure of FIG.
It is a perspective view which shows the state which soldered.

11 is an enlarged sectional view of a main part showing a state where the tongue piece shown in FIG. 9 is bent.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Connection structure 2 Circuit board 3 Shield case 4 Partition plate 5, 6 Notch (specifying tongue for connection) 7 Tongue for connection 8, 9, 13, 14 (Notch for fixing tongue) 10, 12 Fixing tongue

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H05K 9/00 H05K 7/14

Claims (1)

(57) [Claims] 1. A circuit board having a conductor pattern formed on one main surface thereof, and a shield case disposed to surround a side surface of the circuit board, wherein one end of the circuit board is provided at an edge of the shield case. A tongue piece for connection defined by a pair of cuts having a bottom at a position shallower than a position in contact with the surface, a position in contact with one main surface of the circuit board, or a position in contact with an intermediate portion in the thickness direction of the circuit board A fixing tongue defined by a pair of cuts having a bottom is provided, and a portion of the main surface of the circuit board where the conductor pattern is not formed is supported by the fixing tongue; A connection structure, wherein a conductor pattern on one main surface of a substrate and the shield case are electrically connected via the connection tongue.