JP3588873B2 - Printed board - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a printed circuit board that can improve the reliability of an electronic control device.
[0002]
[Prior art]
A conventional collective printed circuit board has been punched out of a base plate with a mold to connect and integrate a plurality of individual printed circuit boards with component insertion holes, perforations, and slits. When a board-to-board connector for connection between punlit boards is mounted on the collective printed circuit board, there is a possibility that the connection reliability of the connector may be reduced during manufacture of the electronic control device.
[0003]
[Problems to be solved by the invention]
In an electronic control device equipped with a board-to-board connector capable of directly connecting printed circuit boards to each other without using a lead wire, the connection terminal portion of the board-to-board connector has an overhang shape projecting to the side from the printed circuit board mounting surface. It has become. A plurality of individual printed boards and different kinds of individual printed boards on which this connector is mounted are connected by perforations and slits, and in a single integrated printed board, the arrangement of the connectors allows electronic control of the integrated printed board. During manufacturing as a device, there is a possibility that a flux applied at the time of soldering with a soldering device after mounting the components passes through the slit, scatters and attaches to the connection terminal portion of the connector. At this time, there has been a problem that the connection reliability may be reduced, such as deterioration of the terminal due to chlorine contained in the flux and increase in contact resistance due to solid components. Further, in order to prevent the scattering of the flux, there is a problem in that the printed circuit board is distorted or warped due to stress when a part of the integrated printed circuit board is fitted back by the pushback method. As a prior art for solving this problem, there is Japanese Patent Application Laid-Open No. 3-60091. However, in this prior art, it is necessary to provide a slit for absorbing stress around a printed board to be fitted back. That is, there is a problem that an extra printed board for providing a slit and a space for the extra printed board are required, and there is a restriction that a circuit pattern cannot be set around the slit. Further, when a part of the collective printed circuit board is fitted and connected by the pushback method, there is a problem that the connection strength between the individual printed circuit boards is reduced due to stress such as component insertion stress by an insert machine. Further, since there is a possibility that the connection between the printed boards by the board-to-board connector may be hindered by the perforation burrs generated when the collective printed board is divided into the individual printed boards, it takes time to cut the burrs. Needed. The present invention has been made to solve the above problems, when one of the individual printed circuit board of the individual printed circuit board and a heterologous implementing the board to Bodoko connector, between perforations for connecting between the individual printed circuit board that is one of , And the slit portion is fitted back. Further, an individual printed circuit board and a different type of individual printed circuit board adjacent thereto are separately formed by a slit without perforations, and a slit portion is formed at least over a length of at least a connector width in a lower portion of the connection terminal portion of the connector. It has been fitted back by the pushback method.
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides a connection sewing machine for connecting an individual printed board on which a board-to-board connector is mounted and a different individual printed board to a collective printed board in which a plurality of individual printed boards and different individual printed boards are integrated. In the eye and the slit, the slit portion between the perforations located below the terminal portion of the board-to-board connector is fitted back by the pushback method. Further, according to the present invention, an individual printed circuit board on which the connector is mounted and a different type of individual printed circuit board adjacent to each other are separated and formed by slits without perforations, and at least a portion of the slits below a connection terminal portion of the board-to-board connector. It is fitted back by the pushback method over the length of the connector.
[0005]
[Action]
According to the present invention, in the manufacturing process of an electronic control device equipped with a board-to-board connector that directly connects printed circuit boards without using lead wires by this configuration, the flux scatters and adheres to the connection terminals of the board-to-board connector. And reduce the distortion and warpage of the collective printed circuit board caused by the stress when fitting back a part of the collective printed circuit board by the pushback method, and improve the strength of the integrated printed circuit board in one sheet In addition, in the manufacturing process of the electronic control device, it is possible to prevent detachment of the fitted printed circuit board, cracking of the perforation, etc., which can occur due to stress of parts insertion of the insert machine, and to prevent burrs generated when breaking the perforation. The number of steps for cutting can be reduced.
[0006]
【Example】
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 5A is a connection diagram of a printed circuit board when parallel connection is performed using a board-to-board connector. In the figure, 1 is a female terminal side of the connector, and 2 is a male terminal side of the connector. Reference numerals 3 and 4 denote individual printed circuit boards on which the connector 1 or 2 is mounted. Here, the board-to-board connector 1 has an overhang shape in which connection terminals protrude to the side from the printed circuit board mounting surface in order to directly connect the connectors. FIG. 5B is an external view of a unitary printed circuit board in a conventional example, and FIG. 5C is a sectional view of the connector mounted portion in the conventional example. The printed circuit board is punched out from an original plate having a predetermined size by a mold to obtain a necessary external shape, and holes are formed for inserting various components such as a resistor and an IC. The figure shows a collective printed circuit board obtained by punching with a mold in this way. 5a is a single printed circuit board 3 on which a board-to-board connector is mounted. 5b is an individual printed circuit board for improving production efficiency. The printed circuit board 5a is made of one type of individual printed circuit board, and is connected to each other by a perforation punched by a die and a slit, thereby forming one collective printed circuit board 5. Here, the mounting position of the connector 1 is arranged on the end face of the individual printed circuit board 5a, and the connection terminal portion protruding from the connector side surface intersects the connection slit of the individual printed circuit boards 5a and 5b. When manufacturing such an integrated printed circuit board as an electronic control unit, the flux is applied uniformly to the soldering surface of the printed circuit board by foaming or spraying when the flux is applied at the time of soldering after mounting components. However, at this time, as shown in FIG. 5C, there is a possibility that the flux scatters from the slit portion and adheres to the connection terminal portion of the connector 1. When the flux adheres to the contact terminal, there is a problem that the connection reliability of the board-to-board connector is reduced due to corrosion of the terminal due to chlorine contained in the flux or insulation due to solid content.
[0007]
FIG. 1A is a reference example of a printed circuit board by a pushback method . In the drawing, the collective printed circuit board 5 is punched by a metal mold with an outer shape, component insertion holes, and perforations and slits for connecting a plurality of individual printed circuit boards. Here, the individual printed circuit board 5b is fitted back by a pushback method, not by punching with a die. FIG. 1B is a cross-sectional view of a boundary portion between the individual printed circuit boards 5 a and 5 b located below the connection terminal portion of the connector 1. Here, as described above, since the individual printed circuit board 5b is connected to the collective printed circuit board main body by fitting, the gap is not present between the individual printed circuit board 5a and the individual printed circuit board 5a. As a result, during the application of the flux during the manufacturing of the electronic control device, it is possible to prevent the scattering of the flux to the connector terminals from the gaps between the individual printed circuit boards, and therefore the reliability is reduced due to the flux adhering to the connector terminals. Can be prevented.
[0008]
In addition, the pushback method is a method in which a part once punched by a mold is fitted back into a punched space by a mold again.
[0009]
Further, a reference example of another printed circuit board will be described with reference to FIG. In the reference example of the previous printed circuit board, the entire peripheral end face of the individual printed circuit board 5b to be fitted back is in contact with the individual printed circuit board 5a and the discarded board 5c for adjusting the outer shape. In such a configuration, when the individual printed circuit board 5b is fitted back, the once-punched one is pushed into the collective printed circuit board main body to be fitted, so that stress is applied to the collective printed circuit board body 5, and as a result, the entire collective printed circuit board 5 May be distorted or warped. Such distortions and warpages cause problems in the production of electronic control devices, such as relative displacement of the component insertion holes and no solder at the center of the warp. FIG. 2A is an external view of a printed circuit board according to the present invention. In this drawing, the individual printed circuit board 5b is fitted back by the pushback method, but the contact portion between the individual printed circuit board 5a and the discarded substrate 5c is not the entire circumference, two of the four sides are slits, and the remaining two sides are slits. On the side of the individual printed circuit board 5a on which the inner board-to-board connector 1 is mounted, only a portion necessary to prevent the scattering of the flux to the connection terminal portion of the connector 1 is fitted and contacted. Are provided with slits, and the rest are fitted and connected. As described above, by minimizing the connection portion, the fitting-back stress in the ab direction in the drawing is distributed by the slit, and the fitting-back stress in the cd direction in the drawing is dispersed by the partial connection. Thereby, distortion and warpage of the printed circuit board at the time of fitting can be reduced.
[0010]
Next, a first embodiment of the present invention will be described with reference to FIG. In the above-described example of the printed circuit board, a part of the individual printed circuit boards constituting the collective printed circuit board is fitted back by the pushback method and connected by fitting. On the other hand, in the manufacture of an electronic control device, a component insertion stress by an insert machine and a vibration at the time of moving a conveyor are applied to a printed circuit board. In such a situation, the fitting force for connecting the individual printed circuit boards cannot withstand the individual printed circuit boards, and the separated printed circuit boards that have been fitted back due to the stress may be disconnected or the connection perforations may be cracked. May not be able to keep. FIG. 3 is an enlarged view of the connection boundary between the individual printed circuit boards 5a and 5b integrated by the present invention. Each individual printed circuit board is connected to a perforation formed by punching with a die and a slit. Further, the slit portion which is usually discarded is fitted back by the pushback method. The slit to be fitted back is provided below the connection terminal portion of the connector 1 to prevent the scattering of the flux, improve the connection strength between the individual printed circuit boards due to perforations, and sufficiently withstand the stress during manufacturing.
[0011]
Further, a second embodiment will be described with reference to FIG. As described with reference to FIG. 5A, the present invention relates to a printed circuit board of an electronic control device using a board-to-board connector for directly connecting printed circuit boards. As a feature, because of direct connection, a gap is required between the end faces of the printed circuit board, which is regulated by the fitting distance of the connector, due to the arrangement of the connectors 1 and 2. Here, in the first embodiment, the individual printed boards 5a and 5b are connected by perforations. However, when dividing the collective printed board into individual printed boards, large burrs may be formed depending on how the perforations are broken. Can occur. The burrs need to be smaller than the gap, which is regulated at the time of the connector fitting described above. Therefore, after division into individual printed circuit boards, post-processing such as cutting of burrs is required, and there is a problem of an increase in man-hours. Was. Further, since the space of the closed slit between the perforations is fitted back, there is a possibility that the printed circuit board may be distorted due to the fitting stress. FIG. 4 is an enlarged view of a connection portion between the individual printed circuit boards 5a and 5b in the present invention. In this drawing, a boundary end face portion connecting the individual printed circuit boards is formed separately by a slit without perforations, and at least the length of the connector 1 which is a portion of the slit necessary for preventing the flux from scattering to the connector terminal. The slits above this are fitted back by the pushback method. In such a configuration, since no perforation is provided, no burrs are generated at the time of division into individual printed circuit boards, and thus the number of steps for deburring can be reduced. In addition, since the closed space is not regulated by the perforation, and the stress in the ab direction at the time of refitting is dispersed, the distortion of the printed circuit board that may occur when the slit is refitted can be reduced.
[0012]
【The invention's effect】
As is clear from the above description, according to the present invention, after the components are mounted on the printed circuit board, the flux applied before the soldering by the soldering device passes through the slit between the individual printed circuit boards, and The connection terminals can be directly connected to each other, and the connection terminal portions can be prevented from scattering and adhering to the connection terminal portions of the overhang-shaped board-to-board connector projecting from the side surface.
[0013]
In addition, the present invention can reduce the distortion and warpage of the collective printed circuit board caused by the stress at the time of fitting back by the pushback method, and in the prior art, due to the slit installation for preventing distortion, Issues such as generation of a printed circuit board or regulation on pattern design can be eased.
[0014]
Further, according to the present invention, in a collective printed circuit board integrated by fitting connection, the strength of connecting the individual printed circuit boards to a stress such as a component insertion stress by an insert machine can be improved.
[0015]
Further, the present invention occurs when the collective printed circuit board is divided into a plurality of individual printed circuit boards,
This has excellent effects such as reducing the number of steps for cutting perforated burrs and reducing the distortion of the printed circuit board that may occur when the slit is fitted back.
[0016]
Although the present invention has been applied to a connector, the same effect can be obtained for a printed circuit board on which a component such as a mechanical component having a contact point such as a switch may have an influence on the reliability of the component due to the adhesion of flux. Have.
[0017]
Also, in producing the printed circuit board of the present invention, a component insertion hole by a punching die, an individual printed circuit board connection at a perforation, and a mixed method of fitting back an individual printed circuit board by a pushback die, are resistant to external stress, And it can be produced efficiently. In addition, by realizing the punching die and the pushback die in one die, the printed circuit board of the present invention can be more efficiently produced with a small number of steps.
[Brief description of the drawings]
[1] (a) Outline drawing (b) cross-sectional view of the printed circuit board reference example using the pushback method [2] PCB reference example using the pushback method of the printed circuit board reference example using the pushback method the first connection portion view of a printed board according to an embodiment of the connecting portions site view of the printed circuit board according to a second embodiment of the invention, FIG 5 (a) present in the outline drawing Figure 3 the present invention (B) Outline view of printed circuit board according to conventional example (c) Cross-sectional view of printed circuit board according to conventional example [Description of References]
Reference Signs List 1 Female side of board-to-board connector 2 Male side of board-to-board connector 3 Electronic control unit 4 mounted with connector 1 Electronic control unit 5 mounted with connector 2 Integrated printed circuit board 5a Board-to-board connector Individual printed circuit board 5b to be mounted Different kind of individual printed circuit board 5c connected to individual printed circuit board 5a Discarded board connected for external shape shaping

Claims (2)

In a collective printed circuit board in which an individual printed circuit board for mounting a board-to-board connector having a shape in which a connection terminal portion is overhanged from a printed circuit board mounting surface and a different kind of individual printed circuit board are connected by a perforation and a slit, The slit portion between the perforations connecting the individual printed circuit board and the different individual printed circuit board, which is located below the connection terminal portion of the board-to-board connector mounted on the printed circuit board, is fitted back by a pushback method. And printed circuit board. In a collective printed circuit board in which the individual printed circuit board on which the connector is mounted and a different type of individual printed circuit board are connected by perforations and slits, a different type of individual printed board adjacent to the individual printed circuit board on which the board-to-board connector is mounted At least one side between the substrates is separated and formed by a slit without perforations, and a slit portion of the slit is formed by a pushback method over a length at least equal to or greater than the connector width at a lower portion of the connection terminal portion of the board-to-board connector. The printed circuit board according to claim 1 , wherein the printed circuit board is fitted back.

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