JP2818911B2 - Printed wiring board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed wiring board, and more particularly to an improvement in a printed wiring board in which a part of a conductor circuit is temporarily disconnected for electrical inspection or the like and then reconnected.

[0002]

2. Description of the Related Art In general, a printed wiring board has a conductor circuit formed by etching a copper foil or the like on an insulating base material. To get an electrical circuit that matches

By the way, in such a printed wiring board, a part of a conductor circuit is temporarily disconnected in order to inspect the quality of an electronic component mounted on the printed wiring board, and the like.
Some have electrical circuits that need to be reconnected afterwards. For example, in the case of an electric circuit forming a memory block as shown in FIG. 5 , in order to analyze a defect in the memory block, the common line (common line) is disconnected once and the portion is replaced with another portion. It is necessary to find a defective part in a circuit independent from the above, and to repair the defect, and then reconnect the disconnected part. And such a disconnection → restoration →
Step of re-connection has been conventionally performed in the manner shown in FIG. That is, first, as shown in FIG. 4 (b), once to break the conductive circuit a part of the conductor circuit is coated with a solder resist is cut by a cutter knife or the like. Next, as shown in FIG. 4 (b), to remove the solder resist of both edges in being disconnected conductor circuit. Finally, as shown in FIG. 4 (c), again connecting the conductor circuits vinyl wire or the like soldered on both edges of the conductive circuit.

As described above, the conventional reconnection is performed by removing a solder resist and then soldering a vinyl wire or the like.

[0005]

However, the conventional reconnection method as described above not only requires a complicated operation such as removal of a solder resist and soldering of a vinyl wire or the like, but also requires a conductor circuit more than necessary. Cut too much,
Alternatively, there has been a problem that it is difficult to recognize a broken portion, and the user may forget to repair it when reconnecting.

Accordingly, the present invention was devised,
An object of the present invention is to provide a printed wiring board that can be easily reconnected and can be easily reconnected without overcutting or forgetting to repair a conductor circuit.

In particular, in the above-described memory block circuit, it is necessary to disconnect and reconnect many points in order to find and repair one defect. It appears remarkably.

[0008]

Means adopted by the present invention to solve the above-mentioned problems will be described with reference to the reference numerals used in the drawings corresponding to the embodiments. In the printed wiring board 100 in which a part of the conductor circuit 10 is once disconnected and then reconnected, a connection part 23 and one end are provided near the connection part 23 in a part of the conductor circuit 10. A solder pool portion 22 in which the conductor width gradually decreases toward the end portion 23, and a portion provided so as to connect the end portion of the solder pool portion 22 and the connection portion 23, and is narrower than both.
Constricted part 21 removed when conducting an electrical inspection or the like
And a conductor pad 20 which is not covered with the solder resist and is provided with a solder pool portion 22 and a connection portion.
23 is electrically connected to the printed wiring board 100 by molten solder .

That is, the conductor circuit 10 which is to be disconnected
Of the connecting part 23, the constricted part 21, and the solder pool part 22
Is provided, and the solder resist 30 on the conductive pad 20 is removed. When conducting electrical inspections, etc.
21 is removed to form a disconnected state.
The molten solder stored in the pool 22 is pushed toward the connection 23.
However, they are electrically connected.

The conductor width of the constricted portion 21 is preferably equal to or smaller than the conductor width of the other conductor circuit 10 from the viewpoint of workability in cutting.

The shape of the solder pool 22 is as follows.
Although various types are conceivable as shown in FIGS. 1 to 3 , the point is that the conductor width gradually decreases as it approaches the end of the connection part 23 , that is, the constricted part 21, that is, the shape gradually narrows. Anything may be used.

Furthermore, the solder resist 30, but must not be covered on top at least the conductive pad 20, as shown in FIGS. 1 to 3, there is no problem even if uncoated also surrounding.

[0013]

The present invention has the following effects by adopting the above means. That is, the printed wiring board 100 is constricted portion 2 of the contact pads 20
1 is removed to form a disconnected state.
And the reconnection point can be easily identified. In addition, the conductor circuit 10 can be easily disconnected without overcutting.

Further, the provision of the conductor pads 20 makes it easy to recognize the location of the disconnection, and does not forget to disconnect or repair.

Further, as shown in FIG. 2, the solder is temporarily stored in the solder pool 22 of the conductor pad 20, and the solder is pushed out toward the constricted portion 21 with a solder iron.
0 can be reconnected.
Alternatively, since there is no need to remove the solder resist 30, reconnection can be easily performed. At this time, since the solder pool portion 22 has a shape in which the conductor width gradually decreases, the solder once stored therein can be easily driven into the constriction portion 21 and can be reliably reconnected.

[0016]

Next, embodiments of the printed wiring board 100 according to the present invention will be described.

(First Embodiment) FIG. 1 shows a first embodiment of a printed wiring board 100 according to the present invention. Conductor pads 20 in this case, 5
The constricted portion 21 provided on the common line (conductor circuit 10) of the memory block circuit shown in FIG.
A substantially triangular solder pool 22 whose conductor width gradually decreases as approaching the constricted portion 21; and a substantially rectangular connecting portion 2 extending between the constricted portion 21 and the common line.
And 3. And, this conductor pad 20
Is not covered with the solder resist 30 so that solder can be attached to the conductor pad 20.

As shown in FIG. 2, the constricted portion 21 of the conductive pad 20 is cut by a cutter knife or the like to disconnect the printed wiring board 100 thus configured, and a predetermined electrical test or the like is completed. Thereafter, the solder is temporarily stored in the solder pool portion 22 and is pushed out toward the constricted portion 21 by a soldering iron, so that the solder is bridged between the solder pool portion 22 and the connection portion 23, thereby forming the conductor circuit 10 (common line). ) Can be reliably reconnected.

Embodiment 2 FIG. 3 shows a second embodiment. In this example ,
Handa reservoir portion 22 has a square shape, also the connecting portion 2
Since 3 has a rectangular shape, a general rectangular pattern can be used similarly to the second embodiment, which has an effect that the pattern design is simple.

[0020]

As described in detail above, the printed wiring board according to the present invention is characterized in that in a printed wiring board in which a part of a conductor circuit is disconnected once for electrical inspection or the like and then reconnected, A connection part, a solder pool part whose one end is provided close to the connection part and the conductor width gradually decreases toward the end part, and an end of the solder pool part and the connection part; narrow der compared to both provided so as to connect the parts
A constricted portion which is removed when carrying out the electrical inspection, the contact pads are not covered with the solder resist while being composed provided I, wherein said solder reservoir connecting part
Wherein the printed circuit board is electrically connected to the printed circuit board by molten solder . ] In its configuration.

Therefore, according to the printed wiring board, the portion to be disconnected can be easily cut by removing the constricted portion of the conductor pad, and the conductor circuit can be easily disconnected without excessively cutting the conductor circuit. The provision of the pad makes it easy to see the location of the disconnection, and does not forget to disconnect or repair.

Further, the solder can be temporarily stored in the solder pool portion of the conductor pad, and the conductor circuit on the conductor pad can be reconnected only by pushing the solder in the constricted portion direction with a solder iron. , It is possible to easily reconnect. On this occasion,
Since the solder pool has a shape in which the conductor width gradually decreases, the solder once stored therein can be easily driven into the constricted section, and can be reliably reconnected.

[Brief description of the drawings]

FIG. 1 is a partially enlarged plan view of a first embodiment of a printed wiring board according to the present invention, in the vicinity of a conductive pad.

FIG. 2 is a partially enlarged plan view showing a state in which solder is pushed out and a conductor circuit is connected in FIG. 1;

FIG. 3 shows a printed wiring board according to a second embodiment of the present invention .
FIG. 4 is a partially enlarged plan view near a conductor pad .

FIG. 4 is a plan view showing a conventional reconnection method in the order of steps .

FIG. 5 is a block diagram showing an example of a conductor circuit requiring reconnection .
FIG .

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 100 Printed wiring board 10 Conductor circuit (common line) 20 Conductor pad 21 Constriction part 22 Solder pool part 23 Connection part 30 Solder resist

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H05K 1 / 11,3 / 40,1 / 02

Claims (1)

(57) [Claims] 1. A printed wiring board in which a part of a conductor circuit is disconnected once for electrical inspection or the like and then reconnected, a part of the conductor circuit is connected to a connection part, and one end is connected to the connection part. a solder reservoir that conductor width is gradually reduced toward the end portion provided near the parts, narrow in comparison to both provided so as to connect the connection portion and the end portion of the solder reservoir And conduct electrical inspections
And a constricted portion that is removed when the solder pad is formed, and a conductor pad that is not covered with the solder resist is provided, and the solder pool portion and the connection portion are electrically connected by molten solder. Printed wiring board.