JPH10135584A - Printed wiring board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the working efficiency of soldering by forcing one portion of a connector out of a main substrate toward a disposal substrate side, connecting the main substrate to the disposal substrate by a groove for splitting, and providing a positioning means for automatic device for inserting a surface- mount part at the disposal substrate. SOLUTION: A printed wiring board 1 is composed of a main substrate 1a and a disposal substrate 3, and an upper split groove 4a and a lower split groove 4b for easily splitting the main substrate 1a and the disposal substrate 3 are formed. For example, a through hole is provided at the printed wiring board 1 and a positioning hole 6 for automatic device is provided on the disposal substrate 3. For mounting a connector 2 to the printed wiring board 1, first the positioning hole 6 is inserted into a pin 7 of an electronic part automatic insertion device for fixing the printed wiring board 1, and a connection lead 2a of the connector 2 is inserted into a through hole. Then, the entire printed wiring board 1 is soldered by an automatic soldering device. Then, by utilizing the upper split groove 4a and the lower split groove 4b, the disposal substrate 3 is split.

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 suitable for an automatic machine such as an automatic soldering apparatus, and more particularly to a printed wiring board which contributes to improving the quality of a soldering operation.

[0002]

2. Description of the Related Art FIGS. 4 and 5 show examples of conventional printed wiring boards. In FIG. 4, reference numeral 10 denotes a printed wiring board, reference numeral 20 denotes an electronic component mounted on the printed wiring board, a part of the body of which protrudes outside the printed wiring board 10, reference numeral 20a denotes a lead of the electronic component, and reference numeral 50 denotes a printed wiring board. The provided through holes 80 for attaching components are masking tapes for protecting the electronic components from the molten solder.

FIG. 5 is a top view of FIG. Normally, to mount the electronic component 20 on the printed wiring board 10, the electronic component 2 is inserted into a through hole 50 provided in the printed wiring board 10.
The electronic component 20 is connected and fixed to the printed wiring board 10 by inserting a connection lead 20a of No. 0 and dipping the printed wiring board 10 in a molten solder bath. By the way, when a part of the main body of the electronic component 20 protrudes from the printed wiring board 10 during the solder bath, molten solder or flux directly touches the part of the protruding main body, and the electronic component 20 is damaged. Conventionally, the masking tape 80 has been applied to the protruding portion of the electronic component 20 to protect the electronic component 20 and prevent the electronic component 20 from being damaged or stained. In some cases, it is performed by hand soldering or the like, but in each case, the number of steps is increased and the efficiency is low.

The electronic component 20 is connected to the printed wiring board 10.
If it is designed to protrude, it may hinder the mounting of the printed wiring board 10 on a chip mounter, an automatic inserter, an automatic soldering device (not shown), and the efficiency may be reduced. If the electronic component 20 protrudes from the printed wiring board 10, a part of the automatic device contacts the protruding electronic component 20 during transportation, or the electronic components 20 come into contact with each other, causing a displacement or a drop. There was a fear of doing. On the other hand, in automatic insertion of a surface mount component, positioning of a main board is necessary. Conventionally, a discarded board is connected to the main board for positioning, and positioning means is provided on the discarded board for production. The position accuracy of the surface-mounted component by automatic insertion was higher as the position was closer to the reference position of the positioning means.

[0005]

In the conventional printed wiring board, when soldering an electronic component protruding outside the printed wiring board, it is necessary to use a masking tape to protect the protruding portion from solder or flux. The workability of soldering was reduced because the masking tape was attached and detached. Further, when the electronic component protrudes from the printed wiring board, the portion hits something and causes a shift from the set position or a drop during transportation. In some cases, it is necessary to change a jig for mounting a printed wiring board on an automatic device such as an automatic soldering device.

[0006] On the other hand, surface mount components in the vicinity of electronic components have a high mounting density and may require higher positioning accuracy than other parts. For example, this is a case where multi-pole connectors are arranged at high density. In addition, although an external force is applied to the connector, the stress applied to the surface-mounted component delicately fluctuates due to the external force. Therefore, it may be necessary to arrange the surface-mounted component at an optimum position with high positioning accuracy. Further, when the connector portion needs to be shielded by a metal chassis or the like, high-precision positioning of a high-density surface mount component in a narrow section is required. When the connector itself is surface-mounted, the positioning accuracy of the connector itself must be good in order to make a good connection with other electronic devices.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a printed wiring board comprising a main board provided with a connector and a discarded board, wherein a part of the connector is discarded from the main board. Provided is a printed wiring board which protrudes to the board side, wherein the main board and the discarded board are connected by a dividing groove, and positioning means for an automatic device for inserting a surface mount component is provided on the discarded board. . Further, the dividing groove provides a printed wiring board whose depth is lower on the lower surface side of the printed wiring board than on the upper surface side.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, 1 is a printed wiring board, 1a is a main board, 2 is a connector, 2a is a connector lead, 3 is a discarded board provided on the printed wiring board 1, 4
Reference numerals a and 4b denote upper and lower dividing grooves for easily dividing the printed wiring board 1 and the discarded board 3, 5 through holes provided in the printed wiring board 1, and 6 to positioning provided on the discarded board. Holes, 7 are pins for fixing the printed wiring board, and 8 is a flux at the time of soldering.

FIG. 2 is a side sectional view of FIG. To attach the connector 2 to the printed wiring board 1, first, the main board 1
The positioning hole 6 of the discarded board 3 provided to extend to a is set to the pin 7 of the printed wiring board fixing jig of the electronic component automatic insertion device, and the printed wiring board 1 is fixed. Then, the connection lead 2a of the connector 2 is inserted into the through hole 5 provided in the main board 1a, and the component insertion is completed. At this time, the closer the positioning hole 6 is to the surface mounting component, the more accurate the positioning can be. Therefore, it is possible to increase the positioning accuracy of the surface mounting component when the multi-pole connector is arranged at a high density. is there.

In addition, if the connector 2 is arranged with good positioning accuracy according to the design value, even if an external force is applied to the connector 2, stress is not applied to other surface-mounted components and the performance is not impaired, and the shielding effect is also as designed. Can be expected. In addition, if the connectors themselves are arranged with high precision, the connection with other electronic devices can be performed smoothly. Next, the printed wiring board 1 on which the connector is mounted is mounted on the automatic soldering device of the next process together with the fixing jig, but the connector 2 protruding from the main board 1a is also located inside the discarded board 3 so that it may be misaligned by something during transportation. Do not fall.

Next, the back surface of the printed wiring board 1 is immersed in a molten flux bath, and the flux 8 is adhered to the leads 2a and the like of the connector 2. At this time, even if the flux 8 jumps, it is blocked by the discard substrate 3 and does not adhere to the connector 2. Next, the back surface of the printed wiring board 1 is immersed in the molten solder bath. Although a part of the body of the connector 2 protrudes from the printed wiring board 1, the molten solder does not directly come into contact with the waste board 3 provided on the printed wiring board 1 and the flux 8 jumps. It does not adhere to the connector 2. In addition, the flux 8
Also, the connector 2 does not deteriorate its characteristics due to heat radiation of solder or the like.

In this way, the connector 2 is connected to the printed wiring board 1 and fixed by soldering. After the soldering process is completed, a cleaning process is performed, and the process is sent to the next process, and the printed wiring board 1 is mounted on a jig or removed from the jig.
The discarded substrate 3 is divided from the main substrate 1a using the upper division groove 4a and the lower division groove 4b provided between the disposal substrate 3 and the main substrate 1a, and the process is completed. Since the lower dividing groove 4b is formed deeper and wider than the upper dividing groove 4a, the dividing groove can be easily divided by the principle of leverage when the discarded substrate 3 is bent downward without the connector 2.

When the individually divided printed wiring board is fixed to the chassis, the tongue for soldering from the chassis and the ground pattern at the end of the printed circuit board are soldered. Due to the shallowness, the distance between the chassis case and the ground pattern of the printed circuit board becomes short, bridging of the solder becomes easy, and the fixing on the connector side where the force is applied becomes strong. In the present invention, the term "connector" is not limited to a connector for electrical connection, but also includes a connector for optical connection.

[0014]

As described above, according to the present invention, the main board and the discarded board are provided on the printed wiring board, connected by the continuous dividing groove, and the discarded board is provided with the positioning means for the automatic device. As a result, accurate positioning can be performed by utilizing this, and component insertion can be performed efficiently. In addition, flux and solder do not adhere to the connector during the soldering process due to the discarded board extending from the main board, and the characteristics of the connector are not deteriorated by radiant heat. By making the lower dividing groove deeper and wider, the substrate can be easily divided when the discarded substrate is bent downward, and the fixing to the chassis can be strengthened.

[Brief description of the drawings]

FIG. 1 is a perspective view of a printed wiring board according to the present invention.

FIG. 2 is a side sectional view of FIG.

FIG. 3 is a sectional view of a dividing groove.

FIG. 4 is a side view of a conventional printed wiring board.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Printed wiring board 1a Main board 2 Connector 3 Discard board 4a Upper division groove 4b Lower division groove 6 Positioning means

Claims (2)

[Claims] 1. A printed wiring board comprising a main board provided with a connector and a discarded board, wherein said connector has a part thereof protruding from said main board to said discarded board side. Are connected by dividing grooves, and positioning means for an automatic device for inserting a surface mount component is provided on the discarded substrate. 2. The printed wiring board according to claim 1, wherein the depth of the dividing groove is deeper on the lower surface side than on the upper surface side of the printed wiring board, and the groove width is wider on the lower surface side than on the upper surface side. Printed wiring board.