JPH04199758A - Circuit board - Google Patents

Abstract

PURPOSE:To enable an automatic solder to be used while a connector is mounted even in the case of a circuit board where the connector protrudes by protecting the connector which is provided on the circuit substrate with a so-called disposed board when performing automatic solder treatment. CONSTITUTION:A circuit substrate 5 is formed in one piece with a board 5'' through a V groove 5' and a terminal 6' of a connector 6 and a terminal of a circuit element such as an IC and a resistor are inserted into a number of holes which are provided at the circuit board 5. The board 5'' covers an entire lower surface of the connector 6, is extended longer than a tip 6'' of the connector 6, and the board 5'' is disposed by providing the V groove 5' after automatic solder treatment so that this board 5'' is called the disposable board 5''. In this manner, a mounting treatment for mounting the connector to the circuit board by covering at a cut part, an automatic soldering treatment for soldering the circuit substrate where the connector is mounted by an automatic solder layer 7, and a cutting treatment for cutting the soldered circuit board at the cut part and removing the disposable board are performed in sequence, thus enabling automatic soldering to be performed while the connector is mounted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a circuit board used in various electronic devices, and particularly to a circuit board having a connector for electrically connecting circuit boards to each other.

[Prior art and its problems]

For circuit boards used in electronic devices, it is necessary to connect the circuit boards to each other or to the circuit boards and connecting wires due to restrictions on the size of the board and the location of the circuit due to the design of the device, and connectors are used for this purpose. ing. In particular, the connection between circuit boards is the fourth
As shown in the figure, it is necessary to protrude from the side edges of the circuit boards 1 and 2 and attach the connectors 3 or 4. The reason is that when connectors 3 and 4 are connected, the convex part 3' of connector 3 fits into the concave part 4' of connector 4, so after connecting connectors 3 and 4, circuit boards 1 and 2 can be arranged without wasting space. This is to ensure that

However, when the circuit board 1 or 2 is configured as described above, it is inconvenient to perform automatic soldering processing.

In other words, in the automatic soldering process, the connector 3.4 and other circuit elements are inserted into the board, immersed (floated) in the automatic solder layer, and soldered. Therefore, the connector 3.4 is connected to the circuit board 1.2.
If the connector 3.4 protrudes from the side edge, flux or solder will adhere to the connector 3.4. In particular, depending on the direction in which the circuit board moves on the automatic solder layer, flux may adhere to the bottle within the connector 3, 4, causing problems such as poor connection.

Further, the housing of the connector 3.4 may be scorched or deformed due to the adhered solder or the heat from the solder layer as it moves over the automatic solder layer.

For this reason, conventionally, a circuit board having a structure in which the connector 3.4 protrudes is created by manually soldering the connector 3.4 after an automatic soldering process. In this case, especially when the terminal pitch of the connector 3.4 is narrow, soldering becomes extremely difficult, resulting in a circuit board that lacks reliability due to the occurrence of so-called solder bridges.

[Object of the Invention] In view of the above-mentioned conventional problems, it is an object of the present invention to create a reliable circuit board by making it possible to perform automatic soldering with the connector attached, even in the case of a circuit board with a protruding connector. With the goal.

[Key points of the invention]

In order to achieve the above object, the present invention provides a circuit board having a connector in which a fitting portion for fitting with a connector of another circuit board projects outward from an end of the circuit board during use. The circuit board is characterized in that an end portion thereof is provided with a sacrificial board having an area at least equal to the fitting portion and connected to the end portion of the circuit board via a cutting portion, and a cutting portion having a special shape. an attachment process for attaching a connector to the circuit board by covering the cut portion in a circuit board provided with a waste board through the attachment process; and an automatic soldering process for soldering the circuit board to which the connector is attached by the attachment process using an automatic solder layer. The method is characterized in that a bonding process and a cutting process in which the circuit board to which the connector is soldered by the automatic soldering process is cut at the cutting section and the waste board is removed are sequentially performed.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIGS. 1(a) to 1(C) are diagrams illustrating the circuit board of this embodiment. Here, FIG. 3A is a diagram showing a state in which a circuit element is inserted into the circuit board of this embodiment, and FIG. Figure (C) is a diagram showing the completed state of the circuit board of this example.

In the same figure (a3), the circuit board 5 is formed integrally with the board 5'' through the V-groove 5', and the terminals 6' of the connector 6 and the IC ( Terminals of circuit elements such as integrated circuits (integrated circuits) and resistors are inserted.The board 5'' covers the entire bottom surface of the connector 6, and also extends longer than the tip 6'' of the connector 6. After the automatic soldering process described later, the groove 5' is split (cut) and the board 5'' is discarded, so hereinafter this board 5'' will be referred to as a discarded board 5''.

The circuit board 5 shown in FIG. 1(a) is created by attaching the connector 6 and ICs (not shown) as in the circuit board 5 described above, and then the circuit board shown in FIG. 1(C) is created based on this circuit board 5. It is necessary to perform the processing shown in FIG.

The process for creating the circuit board 5 will be described below. First, pre-soldering is performed (step ■). This process involves performing the minimum necessary manual soldering on the circuit board 5 into which the circuit elements are inserted. For example, when using an automatic solder layer, electronic components with short terminals tend to move easily, so if these components are fixed in advance. etc.

Next, the IC is automatically inserted, and then masking tape is applied (steps ① and ①). Incidentally, when automatically loading an IC, in addition to the IC, a circuit element having a plurality of terminals at a predetermined pitch is also automatically loaded at the same time.

Next, the circuit elements that cannot be automatically inserted are subjected to glove-insertion processing (step ①). For example, this is the process of inserting resistors, the above-mentioned connector 6, and the like. The state in which various circuit elements are attached to the circuit board 5 as described above is shown in FIG. ).

Next, as described above, the circuit board 5 with the circuit elements inserted is floated on the automatic solder layer and moved over the solder layer 7 as shown in FIG. 1(b). The circuit elements inserted into the circuit board 5 are soldered to the lands of the wiring pattern formed on the bottom surface of the circuit board 5. At this time, as shown in FIG. Since the connector 6 is covered with ``, during automatic soldering process, no flux or unnecessary solder adheres to the connector 6 unlike in the conventional case.

Thereafter, the masking tape pasted on the circuit board 5 is peeled off, and the lead wires of the circuit elements extending long on the bottom surface of the circuit board 5 are cut (steps ① and ①). The circuit board 5 is then cleaned in step (2), in which flux and the like adhering to the circuit board 5 are washed away.

Next, a post-installation manual soldering process (step ①) is performed. This process is, for example, a process for soldering a lead wire directly to the circuit board 5 or a soldering process for a switch or the like that is directly attached to the circuit board 5. In addition, conventionally automatic soldering processing (process ■
), it was not possible to solder the connector, so the connector was installed in this process.

Next, the waste board 5'' is split at the groove 5', and the waste board 5'' is removed from the circuit board 5 (step X).

Circuit board 5 after removing the waste board 5'' as described above
The state is shown in FIG. 1C, and at this point it has the same shape as a conventional circuit board (for example, the circuit board 2 shown in FIG. 4 described above).

Thereafter, a circuit check jig, for example, is attached to the circuit board 5, and the power supply voltage is checked and the operation of each circuit is checked (Step XI). Furthermore, the appearance of solder bridges, etc. is inspected (Step XII), and then the products are packed and shipped (Step X1ll).

By creating the circuit board 5 as described above, when performing automatic soldering, the waste board 5'' prevents flux from adhering to the connector 6, resulting in poor connection of the connector 6,
Damage to the housing can be prevented.

In addition, as shown in Fig. 3 (a) and (b) (however, (a)
) is a side view of the circuit board 5, and (b) is a plan view of the circuit board 5).
The same is true when arranging the IC, as shown in Figures (a) and (b), grooves 5' are provided, connectors 63 to 6c are attached to the circuit board 5 together with ICs, etc., and then automatic soldering is performed. By splitting the spread boards 58'' to 50'' and removing them from the circuit board 5, automatic soldering can be performed without causing problems such as adhesion of flux to the connectors 6a to 6c as described above.

In the production of the circuit board 5 of this example, steps I to X■ shown in FIG. The present invention can be carried out even if the process is different from the process shown in FIG. 2, as long as the process is to perform automatic soldering and then cut the seeded board 5'' with grooves 5'.

In addition, in this embodiment, the disposable substrate 5'' (or 5a'' to 50
Although the connector 6 (or 6a to 6c) is configured to sufficiently cover the lower surface of the connector 6 (or 6a to 6c), the flux, etc. of the present invention may be applied even if the tip 6'' of the connector 6 etc. and the side edge of the sacrificial board 5'' are in alignment. It is possible to prevent the adhesion of

Further, in this embodiment, the cut portion is formed of a V-groove 5', but it may have another special shape, for example, a so-called perforation.

〔Effect of the invention〕

As explained in detail above, according to the present invention, the connectors arranged on the circuit board are protected by a so-called disposable board during automatic soldering, so even if the connector is a protruding circuit board, the connector can be left attached to the circuit board. Can be used with automatic soldering.

[Brief explanation of the drawing]

FIG. 1(a) is a configuration diagram of a circuit board according to an embodiment with a discarded board attached; FIG. 1(b) is a configuration diagram showing a state in which the circuit board according to an embodiment is automatically soldered; Figure 1 (C) is a completed configuration diagram of the circuit board of one embodiment;
The figure is a process diagram for creating a circuit board according to one embodiment, and Figure 3 (a)
) is a side view of a circuit board on which a plurality of connectors are arranged, FIG. 3(b) is a plan view of FIG. 3(a), and FIG. 4 is a diagram illustrating a conventional circuit board. 5...Circuit board, 5'...■Groove, 5", 5a" to 5C"...Discarded board, 6.6a to 6C
...Connector, 6'...Terminal, 7...Solder layer. Patent Applicant Casio Electronics Industries Co., Ltd. Same as above Casio Computer Co., Ltd. 139 [Figure 3 Figure 4

Claims (2)

[Claims] (1) In a circuit board having a connector disposed in such a manner that a fitting portion that fits with a connector of another circuit board protrudes outside from an end of the circuit board during use, at least the fitting portion is provided at an end of the circuit board. A circuit board comprising a sacrificial board having an area equal to the joint part and connected to an end of the circuit board via a cut part. (2) In a circuit board on which a sacrificial board is provided through a specially shaped cut section, a mounting process for attaching a connector to the circuit board by covering the cut section, and a circuit board to which the connector is attached by the mounting process. an automatic soldering process for soldering using an automatic solder layer; and a cutting process for cutting the circuit board to which the connector is soldered by the automatic soldering process at the cutting section and removing the waste board. Characteristic circuit board manufacturing method.