JP2533164Y2 - Connection structure between solid board and flexible 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 connection structure between a solid substrate and a flexible substrate. In particular, the solid substrate is mounted on a resin housing such as an instrument with a screw, and the mounting portion of the solid substrate is connected via a screw. The present invention relates to a connection structure between a solid substrate and a flexible substrate in a case where the flexible substrate is electrically connected and mounted.

[0002]

2. Description of the Related Art In recent years, electronic components equipped with a microcomputer, electric devices and electric components of automobiles, etc.
In addition to the conventional solid substrate, a flexible substrate capable of freely bending the substrate is often used in combination. When the solid substrate and the flexible substrate are used together as described above, it is necessary to make an electrical connection between them.

FIG. 4 shows a circuit board (not shown) of the flexible board 42 and a circuit board of the solid board 43, in which a flexible board 42 and a solid board 43 are attached via a tapping screw 44 to a resin case 41 for an instrument. 43 shows a conventional connection structure between a solid substrate and a flexible substrate for electrically connecting the flexible substrate 43a to the solid substrate.

A boss 41a is provided on a main part of the case 41, and a screw hole 41b is provided in the boss 41a.
Also, a flexible substrate 42 placed on the case 41
Is provided with a screw insertion hole 42a overlapping the screw hole 41b and a circuit pattern (not shown) in which a land is formed around the screw insertion hole 42a. A circuit pattern 43a is provided around the surface side of the mounting hole 43b provided on the solid substrate 43. Conventionally, a conductive member 46 called "eyelet" is fitted and mounted in the mounting hole 43b, and the surface side of the circuit pattern 4 is soldered with solder H.
3a, and the conductive member 46 was exposed on the back surface side. Then, a washer 45 is placed on the surface side of the conductive member 46, and the tapping screw 44 is inserted through the washer 45, the conductive member 46, and the screw insertion hole 42 a to be screwed into the screw hole 41 b, and the conductive by the tapping screw 44. By using the contact pressure between the flexible member 46 and the flexible substrate 42, the circuit pattern 43a and the circuit pattern of the flexible substrate 42 are electrically connected.

[0005]

However, in such a conventional connection structure between the solid substrate 43 and the flexible substrate 42, it is necessary to attach a conductive member 46 which is always a conductive medium to the solid substrate 43. Also, since it is necessary to solder the conductive member 46 and the circuit pattern 43a of the solid substrate 43, the conductive member 46
This requires a lot of man-hours to attach to the solid substrate 43, and has a problem of an expensive structure.

Accordingly, the present invention provides a solid board and a flexible board which can reduce the cost and cost of attaching a special conductive member to the solid board when connecting the solid board and the flexible board. It is an object to provide a connection structure with a substrate.

[0007]

The connecting structure between the solid substrate and the flexible substrate according to the present invention for achieving the above object is as follows.
A solid board is attached to a part of a casing of an instrument or the like by a fastening means with a flexible board interposed therebetween, and a circuit pattern formed on the surface side of the solid board and a circuit pattern of the flexible board are connected to each other through the fastening means. The housing is provided with a projection around the first fastening means insertion hole for mounting the solid substrate, and the solid substrate attached to the housing is provided with a projection. Is provided with a through-hole through which the tip of the convex portion can be seen when overlapped, and the circuit pattern is arranged around the through-hole. A second fastening means insertion hole having the same size as the hole is provided, and the fastening means is configured to connect a circuit pattern provided around the through hole to a back surface side of the solid substrate. When the solid substrate is mounted on the housing by the fastening means in a state where the second fastening means insertion hole of the flexible substrate is aligned with the first fastening means insertion hole on the housing, The circuit pattern is in contact with the fastening means by the convex portion.

[0008]

According to the connection structure between the solid substrate and the flexible substrate of the present invention, the second fastening device insertion hole of the flexible substrate and the through hole of the solid substrate are inserted into the first fastening device insertion hole of the housing. If they are inserted and fastened by fastening means after the alignment and stacking, the circuit pattern on the solid substrate surface and the circuit pattern on the flexible board are automatically electrically connected via the fastening means.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is an assembly perspective view for explaining the structure of one embodiment of a connection structure between a solid substrate and a flexible substrate according to the present invention. In FIG. 1, reference numeral 1 denotes a resin made of a casing of an instrument such as a meter. , 2 is a flexible board, 3 is a solid board, M is a fastening means, 4 is a mounting screw portion constituting the fastening means M, and 5 is a conductive member constituting the fastening means M.

When the case 1 has a thin plate shape, a boss 1a is provided at a portion where a screw is to be attached to secure a sufficient thickness, and the boss 1a has a screw for forming a first fastening means insertion hole. A hole 11 is provided. In this embodiment, an annular convex portion 12 is provided around a screw hole 11 on the front side of the case 1. The height of this annular convex portion 12 is about 0.5 to 1 mm, and in this embodiment, it has a continuous ring shape, but even if the convex portion 12 is discontinuous,
In addition, they do not have to be arranged on the circumference. Also,
At a predetermined position on the front surface side of the case 1, a positioning protrusion 13 for positioning a flexible substrate 2 described later on the case 1 is provided.

The flexible substrate 2 is made of an electrically insulating thin sheet-like flexible material, for example, a polyester film or a polyimide film. A circuit pattern 22 is formed on one side of the flexible substrate 2, and a second fastening means is provided at a required position. A screw insertion hole 21 and a positioning hole 23 forming an insertion hole are provided. The screw insertion hole 21 is provided at a position just overlapping the screw hole 11 on the case 1 when the flexible substrate 2 is placed on the case 1 in a state where the positioning protrusion 13 is inserted through the positioning hole 23. I have. The circuit pattern 22 electrically connected to the solid board 3 forms a land 22a around the screw insertion hole 21.

In this embodiment, a slit S is provided outside the land 22a as shown in FIG. 1, and when the flexible substrate 2 is placed on the case 1, The slit S facilitates the land portion 22 a to be pushed up by the annular convex portion 12, so that the land portion 22 a can easily adhere to the bottom surface of the conductive member 5.

The solid substrate 3 is made of an electrically insulating resin plate having a predetermined thickness, for example, a paper base epoxy resin or a paper base phenol resin, and a circuit pattern 32 is formed on one surface thereof. . Further, a through hole 31 having a size approximately equal to the diameter of the land portion 22a provided around the screw insertion hole 21 provided in the flexible substrate 2 is provided at a required portion of the solid substrate 3. The circuit pattern 32 that needs to be electrically connected to the flexible substrate 2 is connected to a land pattern 33 formed around the through hole 31.

The conductive member 5 constituting the fastening means M made of a conductive material, for example, copper or iron, is inserted into the through hole 31 provided in the solid substrate 3 from the front side. The conductive member 5 has a flange portion 5a and a body portion 5b.
A plurality (four to six) of small projections 52 are provided on the lower surface of the flange portion 5a to ensure contact with the land pattern 33. The trunk 5b of the conductive member 5 has an outer diameter slightly smaller than the inner diameter of the through hole 31 and a length approximately equal to the thickness of the solid substrate 3, and the trunk 5b is inserted when the conductive member 5 is inserted into the through hole 31. Is exposed on the back side of the solid substrate 3.
The conduction member 5 has an insertion hole 51 at the center thereof for inserting the mounting screw 4.

The mounting screw 4 is, for example, a tapping screw, and has a head portion 4a and a screw portion 4b. The screw portion 4b is screwed into a screw hole 11 on the front surface of the case 1.

FIG. 2 shows a case 1 constructed as shown in FIG.
3, the solid substrate 3 is placed thereon, and the conductive member 5 is inserted into the through hole 31 of the solid substrate 3, and the case 1, the flexible substrate 2, the solid substrate 3,
2 is a cross-sectional view showing a connection structure between a solid substrate and a flexible substrate formed by fastening a conductive member 5 with a mounting screw 4, and the same components as those in FIG. 1 are denoted by the same reference numerals.

In the connection structure between the solid substrate and the flexible substrate according to the embodiment configured as described above, as shown in FIG. 2, the annular convex portion 12 on the case 1 pushes up the land portion 22a of the flexible substrate 2. The electrical connection is made by bringing the conductive member 5 into close contact with the bottom surface. In addition, the small projections 52 provided on the lower surface of the flange portion 5a of the conductive member 5 ensure reliable electrical connection to the circuit pattern 32 of the solid substrate 3.

As described above, in the embodiment shown in FIGS.
The circuit pattern 22 of the flexible board 2 and the solid board are directly connected by the convex part 12 of emotion on the case 1 and the conductive member 5 without soldering a conductive member such as an eyelet, which is conventionally required, to the circuit pattern of the solid board. Since the third circuit pattern 32 can be electrically connected, a simple and inexpensive connection structure between the solid substrate and the flexible substrate can be provided.

In the embodiment described above, the case 1, the flexible board 2, the solid board 3, and the conductive member 5 are tightened with the mounting screws 4 to form a connection structure between the solid board and the flexible board. Conductive member 5
And the mounting screw 4 may be integrated, in which case the number of assembling steps is reduced.

FIG. 3 (a) shows the appearance of the fastening means M in which the conducting member 5 and the mounting screw 4 are integrated. In the figure, 6a is a screw head, 6b is a screw portion, 6c is a flange portion, 6d is a trunk portion forming the conductive member 5, 6e is a projection, and FIG. FIG. 10 is a cross-sectional view showing a case where a connection structure between the first embodiment and a flexible substrate is formed, and the same reference numerals are given to the same components as those in the above-described embodiment.

In the embodiment shown in FIGS. 3 (a) and 3 (b), the conductive member such as eyelets, which has been conventionally required, is not soldered to the circuit pattern of the solid board, and the emotion on the case 1 is not changed. 6d that constitutes conductive member 5 with convex portion 12 of
Accordingly, the circuit pattern 22 of the flexible substrate 2 and the circuit pattern 32 of the solid substrate 3 can be electrically connected directly, so that a simple and inexpensive connection structure between the solid substrate and the flexible substrate can be provided.

As described above, according to the connection structure between the solid substrate and the flexible substrate of the present invention, both the number of components and the number of assembly steps can be reduced.

[0024]

[Effects of the Invention] As described above, according to the present invention,
Provided is a connection structure between a solid substrate and a flexible substrate, which can reduce the cost of attaching a special conductive member to the solid substrate and reduce the cost when connecting the solid substrate and the flexible substrate. There is an effect that can be.

[Brief description of the drawings]

FIG. 1 is an assembly perspective view showing a configuration of an embodiment of a connection structure between a solid substrate and a flexible substrate of the present invention.

FIG. 2 is a sectional view of a connection structure between a solid substrate and a flexible substrate in FIG. 1;

FIG. 3 (a) is a perspective view showing another example of the structure of the fastening means used for the connection structure between the solid board and the flexible board of the present invention, and FIG. 3 (b) is a solid view using the screw of FIG. 3 (a). It is principal part sectional drawing of the Example of the connection structure of a board | substrate and a flexible board.

FIG. 4 is a cross-sectional view showing a configuration of a conventional connection structure between a solid substrate and a flexible substrate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resin case (housing) 2 Flexible board 3 Solid board M Fastening means 4 Tubbing screw 5 Conducting member 5a, 6c Flange part 5b, 6d Body 11 Screw hole (first fastening means insertion hole) 12 Convex part 13 Alignment projection 21 Screw insertion hole (second fastening means insertion hole) 22 Circuit pattern 22a Land part 23 Alignment hole 31 Through hole 32 Circuit pattern 33 Land pattern 51 Insertion hole 52 Small projection M Fastening means

Claims (1)

(57) [Scope of request for utility model registration] 1. A solid substrate is attached to a part of a casing of an instrument or the like by a fastening means with a flexible substrate interposed therebetween, and a circuit pattern formed on a surface side of the solid substrate and a circuit pattern of the flexible substrate are A structure for electrically connecting via the fastening means, wherein the housing is provided with a convex portion around a first fastening means insertion hole for mounting the solid substrate, and is attached to the housing. The solid substrate is provided with a through-hole through which the tip of the convex portion can be seen when overlapped, and the circuit pattern is arranged around the through-hole, and the flexible substrate has a third surface on the solid substrate. A second fastening means insertion hole, which is substantially the same as the first fastening means insertion hole, is provided, and the fastening means communicates a circuit pattern provided around the through hole to the back side of the solid substrate. When the solid substrate is mounted on the housing by the fastening means in a state where the second fastening means insertion hole of the flexible substrate is aligned with the first fastening means insertion hole on the housing. A connection pattern between the solid substrate and the flexible substrate, wherein the circuit pattern of the flexible substrate is brought into contact with the fastening means by the projection.