JP4026044B2 - Board connection member - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a board connecting member of a board solder fixing type in which a base end is fixed to a board and a tip is fastened to a fastening terminal provided on a circuit component.
[0002]
[Prior art]
Slightly large circuit components such as resin-encapsulated semiconductor modules have a fastening terminal on the top surface, and the base end is soldered to the board to connect this fastening terminal to the printed wiring layer of the board In general, a terminal plate overlap type fastening method in which the distal end portion of the connecting member is fastened to the fastening terminal with a fastening screw is employed.
[0003]
[Problems to be solved by the invention]
However, in the conventional terminal board overlapping type fastening method described above, relative positional deviation in the thickness direction of the board between the circuit component and the board and the surface direction of the board, shape variation due to manufacturing errors of the circuit parts, etc. The position of each fastening hole in the fastening terminal of the board and the front fastening portion of the board connecting member is shifted in the surface direction or the thickness direction of the board due to the variation of the posture of the board connecting member, repeated thermal stress due to temperature change, etc. When these two are forcibly fastened with screws, a stress is generated in the board connecting member, and this stress acts on the solder for fixing the board connecting member to the board, and the solder joints are fatigued, and the solder is cracked or cracked. Since there is a possibility that the solder will peel off, attention must be paid to the positioning and fastening work of the circuit components.
[0004]
The present invention has been made in view of the above problems, and provides a board connecting member that can improve the reliability of a soldering portion that fixes the board connecting member while avoiding complicated work and high accuracy. That is the purpose.
[0005]
[Means for Solving the Problems]
The board connecting member according to claim 1 , A solder fixing base end portion (11) soldered to the substrate (4), and a fastening terminal for the circuit component (3) extending from the substrate (4) at a predetermined distance and substantially parallel to the substrate (4) The terminal fastening distal end portion (13) to which (7) is fastened, and the solder fastening proximal end portion (11) and the terminal fastening distal end portion (13) are integrally formed by a metal plate to form the solder fastening proximal end portion (11). ) and connecting the central part connecting the terminal connection tip (13) (12) and the L-shaped board connecting member (1) having the connection middle portion (12) is easy elastic deformation or plastic deformation Having an easily deformable portion having characteristics and facilitating displacement of the terminal fastening tip (13) in the thickness direction of the substrate (4) and the surface direction of the substrate (4), The terminal fastening tip (13) is substantially parallel to the substrate (4). A first neck portion (128) narrowly formed on the extending flat plate portion (121), and a flat plate erected substantially perpendicularly to the substrate (4) from the solder fixing base end portion (11) The portion (120) has a second neck portion (129) formed narrowly, and the bent portion (122) connecting the two flat plate portions (121, 122) is formed wide. Is the feature.
[0006]
In the present invention , when the board connecting member has an easily deformable part that easily deforms in the thickness direction of the board, for example, a fastening terminal of a circuit component and a tip fastening part (terminal fastening) of the board connecting member to be fastened by a screw thereto Even if the tip portion is displaced in the substrate thickness direction, the easily deformable portion is elastically deformed or plastically deformed in the rotation direction in a plane perpendicular to the substrate, and the tip fastening portion (terminal fastening tip portion) is changed to the substrate. The stress applied to the solder (solder) that fixes the solder fixing base end of the board connecting member to the board can be reduced without substantial steps and cost increase. Therefore, it is possible to suppress a decrease in the reliability of the solder joint portion.
[0007]
This stress is caused by the relative displacement between the fastening terminal of the circuit component and the board connecting member at the time of fastening, the rotational twisting force in the surface direction of the board on the board connecting member due to the frictional force at the end of fastening, and the temperature fluctuation. It is generated by periodic thermal stress applied to the board connecting member due to repetition of the above.
[0008]
Furthermore, in the present invention , when the board connecting member has an easily deformable portion that easily deforms in the surface direction of the board (direction perpendicular to the board thickness direction), for example, it is fastened by a fastening terminal of a circuit component and a screw. Even if the front end fastening portion (terminal fastening front end portion) of the substrate connecting member to be shifted is displaced in the surface direction of the substrate, the easily deformable portion is deformed in the rotation direction in a plane parallel to the substrate, and the front end fastening portion Since the (terminal fastening tip) is displaced in the board thickness direction, the stress applied to the solder (solder) that fixes the solder fixing base end of the board connecting member to the board is reduced without substantial increase in process and cost. It is possible to suppress a decrease in reliability of the solder joint portion due to this stress.
[0009]
In this configuration, when the substrate connecting member has an easily deformable portion that easily deforms in the thickness direction and the surface direction (direction perpendicular to the substrate thickness direction) of the substrate, both of the effects described above can be achieved simultaneously.
[0010]
That is, according to this configuration, the fastening terminal of the circuit component, which is extended from the top surface of the circuit component or the circuit component at a predetermined distance from the substrate surface and substantially parallel to the substrate, is connected to the wiring of the substrate through the substrate connecting member. Can be connected with electrical resistivity and short wiring distance, can reduce the electrical resistance and wiring impedance of the wiring between the circuit component fastening terminal and the board, and can ensure the reliability of the board connecting member It is.
[0011]
Furthermore, the present invention has a first neck portion that is narrowly formed on a flat plate portion that extends substantially parallel to the substrate from the terminal fastening tip portion.
[0012]
According to this structure, an easily deformable part can be formed simultaneously at the time of stamping the board | substrate connection member from a metal plate (usually copper plate), and the increase in a manufacturing process can be suppressed. The easily deformable portion can be easily elastically deformed even if a part of the board connecting member which is a plate-like member is thinned. However, it is easy to elastically deform the board connecting member in the thickness direction by simply reducing the thickness without reducing the width, but it is easy to elastically deform in the direction perpendicular to it (twist direction). There is a problem that it is not easy to obtain, and cannot be produced by simple punching of a metal plate in production, and requires press working. Note that the term “substantially parallel” as used herein allows manufacturing tolerances of +/− 10 degrees or less. That is, according to this configuration, it is possible to improve the elastic deformability in the substrate surface direction and the substrate thickness direction without adding a manufacturing process.
[0013]
Furthermore, the present invention has a second neck portion (129) formed narrowly on a flat plate portion erected substantially perpendicular to the substrate from the solder fixing base end portion.
[0014]
According to this configuration, the neck portion can easily perform elastic rotational deformation in the surface direction of the substrate or rotational deformation in the thickness direction of the substrate. It can be displaced in the surface direction or the thickness direction of the substrate with the neck portion as the rotation center. According to this configuration, in particular, since a distance can be obtained between the neck portion and the tip fastening portion as compared with the neck portion according to claim 2, a slight twisting direction of the neck portion (substrate surface) Direction) or bending direction (substrate thickness direction), the amount of elastic deformation can be proportionally increased at the front end fastening portion, can be realized only by punching, and the effect of claim 1 is prevented while preventing an increase in cost. Can be further increased. Note that the term “substantially right angle” as used herein allows manufacturing tolerances of +/− 10 degrees or less.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
The suitable aspect of the board | substrate connection member of this invention is demonstrated with reference to a following example.
[0017]
[Example 1]
An example of the board connecting member of the present invention will be described with reference to FIGS.
[0018]
DESCRIPTION OF SYMBOLS 1 is the L-shaped terminal which makes the board connection member said by this invention, 2 is an aluminum base, 3 is a circuit component module, 4 is a printed circuit board, 5 is a screw, 6 is a printed circuit board mounting circuit component, 7 is the circuit component module 3 A fastening terminal, 8 is a washer.
[0019]
In this embodiment, the circuit component module 3 is a square resin module in which a semiconductor chip is sealed with a resin. The circuit component module 3 is mounted and fixed on an aluminum base 2 that performs heat sink mass and heat dissipation and forms a bottom plate of a sealed case. Yes.
[0020]
A support surface (not shown) with screw holes is formed on the aluminum base 2, and the printed circuit board 4 is fastened and fixed to the support surface with screw holes. A printed circuit board mounting circuit component 6 is mounted on the printed circuit board 4. The circuit component module 3 projects through the opening formed in the printed circuit board 4 to the side opposite to the aluminum base of the printed circuit board 4.
[0021]
A pair of fastening terminals 7 protrude from the top surface of the circuit component module 3, and the leading end of the fastening terminal 7 having screw holes extends in the surface direction of the printed circuit board (substrate) 4.
[0022]
The L-shaped terminal 1 will be described in more detail with reference to FIGS.
[0023]
The L-shaped terminal 1 is formed by punching a copper plate into a predetermined shape and bending it, and has a solder fixing base end portion 11, a connection center portion 12, and a tip fastening portion 13. The solder fixing base end portion 11 is inserted into a through hole (not shown) of the printed circuit board 4 and soldered to the printed circuit board 4 on the back surface of the printed circuit board 4 by a jet solder method or the like. The distal end fastening portion 13 has a fastening hole 14, and is fastened to the fastening terminal 7 by a screw 5 that passes through the hole 14 and is screwed into a screw hole of the fastening terminal 7.
[0024]
The connection center portion 12 of the L-shaped terminal 1 is a portion that connects the solder fixing base end portion 11 and the terminal fastening distal end portion 13, and is bent into a pair of flat plate portions 120 and 121 that are perpendicular to each other, and an L-shaped plate shape. And has a bent portion 122 connecting the flat plate portions 120 and 121. Connecting the central portion 12 further includes a groove portion 123, 124 provided in the flat plate portion 12 1, a groove portion 125, 126 provided in the flat plate portion 12 0, is narrowed by the grooves 123 and 124 a of the flat plate portion 12 1 a neck portion 128 is a portion, and a neck portion 129 is a narrow portion of the flat plate portion 12 0 in the groove 125.
[0025]
Since the neck portions 128 and 129 are narrowed by the groove portions 123 to 126, the neck portions 128 and 129 are easily elastically or plastically deformed in the surface direction or the thickness direction of the printed circuit board 4 with respect to a certain external force.
[0026]
Therefore, even if stress is generated between the both ends of the L-shaped terminal 1 which is the board connecting member, that is, between the solder fixing base end portion 11 and the front end fastening portion 13, for example, for some reason as described above, Since the neck portions 128 and 129 are easily deformed in the stress application direction by the stress, the stress is eliminated or reduced. Therefore, the stress applied to the solder fixing base end portion 11 is relieved, and the reliability of solder joint can be ensured.
[0027]
(Modification)
In the above embodiment, the neck portions 128 and 129 are provided, but either one may be provided, or a larger number may be provided.
[Brief description of the drawings]
FIG. 1 is a partial side view of an electronic circuit device using an L-shaped terminal (substrate connecting member) according to an embodiment of the present invention.
FIG. 2 is an enlarged plan view of the L-shaped terminal shown in FIG.
FIG. 3 is an enlarged side view of the L-shaped terminal shown in FIG.
4 is an enlarged front view of the L-shaped terminal shown in FIG .

[Explanation of symbols]
1: L-shaped terminal (board connection member)
3: Circuit component module (circuit component)
4: Printed circuit board (board)
7: Fastening terminal 11: Solder fixing base end portion 12: Connection center portion 13: Tip fastening portion 128, 129: Neck portion (easy deformation portion)

Claims (1)

A solder fixing base end (11) soldered to the substrate (4) ;
A terminal fastening tip (13) extending from the substrate (4) at a predetermined distance and extending substantially parallel to the substrate (4) to which the fastening terminal (7) of the circuit component (3) is fastened;
A connecting central portion ( 11) formed integrally with the solder fixing base end portion (11) and the terminal fastening tip end portion ( 13) by a metal plate and connecting the solder fixing base end portion (11) and the terminal fastening tip end portion (13). 12)
In the L -shaped board connecting member (1) having
The connecting central portion (12), said terminal connection tip of the surface direction of the thickness direction and the substrate has the substrate easy characteristic elastic deformation or plastic deformation (4) (4) a displacement (13) have a deformable portion to facilitate respectively,
The easily deformable portion is
A first neck portion (128) formed narrowly on a flat plate portion (121) extending substantially parallel to the substrate (4) from the terminal fastening tip portion (13), and the solder fixing base end portion (11) to the substrate (4) and a second neck portion (129) narrowly formed on the flat plate portion (120) erected substantially at right angles,
The board connecting member, wherein the bent portion (122) connecting the two flat plate portions (121, 122) is formed wide .

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