JPH0215351Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a mounting structure for a plurality of flexible printed circuit boards.

When wiring complicated wiring in a limited space, for example, when wiring to instruments in a vehicle, a flexible printed circuit board is used for the wiring that displays the corresponding instruments on the back side of the instrument panel. When the vehicle is running, the information that the driver should check as information displayed on the instrument panel for driving is increasing in the number of equipped parts of the vehicle and from the viewpoint of enabling the vehicle to drive safely under complicated traffic conditions. It has been rapidly increasing since then. With this increase in driving information, the number of flexible printed circuit boards that are used and arranged on the back side of the display board for the instruments of the vehicle increases. In order to arrange a large number of flexible printed circuit boards in a limited installation space in a vehicle, it is necessary to arrange the plurality of flexible printed circuit boards so that they are stacked on top of each other.

What is shown in FIG. 1 is a conventional mounting structure for a flexible printed circuit board, and for convenience of explanation, we will take up the case where two flexible printed circuit boards 11 and 12 are used. Mounting case 1
Generally, the outer surface of No. 3 includes a plurality of mounting surfaces 13-H arranged substantially parallel to each other and mounting surfaces 13-H adjacent to each other.
A connecting surface 13-V is provided at a predetermined angle with respect to a mounting surface 13-H that connects the connecting surfaces. On the mounting surface 13-H of the case 13, lamps 15-1 to 15-3 corresponding to the respective instruments are protruded, and engagement projections 16-1 to 16-4 are protruded.

For this mounting case 13, its mounting surface 13-
The first and second flexible printed circuit boards 11 and 12 are attached so as to face each other across the connection surface 13-V. First substrate 11
At the positions corresponding to the lamps 15-1 to 15-3, there are openings 17- having a shape that is substantially similar to the external shape of the lamps 15-1 to 15-3 and capable of engaging with the lamps 15-1 to 15-3, respectively. 10 to 17-30 are formed, and engagement ports 18 having a diameter slightly smaller than the outer diameter of the shaft of the engagement protrusions 16-1 to 16-4 are formed at positions corresponding to the engagement protrusions 16-1 to 16-4. -1 to 18-
4 is formed. Engagement port 18- of first board 11
1 to 18-4 to the respective engagement protrusions 16-1 to 16-1.
6-4, and the openings 17-10 to 17
- 30 are engaged with the corresponding lamps 15-1 to 15-3 and the first board 11 is fitted and disposed in the case 13, and the first board 11 is placed in close contact with the case 13. Mounting surface 13-H and connection surface 1
3-V. Note that if a shallow fitting recess into which the first substrate 11 is fitted is formed in the case 13, the first substrate 11 can be disposed more closely to the case 13.

For the second substrate 12, lamps 15-1 to
Lamps 15-1 to 15 are placed at positions corresponding to 15-3.
- Opening 17-1 with a slightly larger diameter than the external shape of 3
17-3 is formed, and the engaging protrusions 16-1 to 16-
Engagement openings 18-1 to 18-4 having the same shape as the first substrate 11 are formed at positions corresponding to 4. Engagement ports 18-1 to 18-4 are provided on the first substrate 11 disposed on the case 13, respectively, with engagement protrusions 16-1.
The second substrate 12 is disposed so as to be engaged with the second substrate 16-4. The first and second substrates 1 are arranged in correspondence with the arrangement positions of the engaging protrusions 16-1 to 16-4.
1 and 12 have engaging ports 18-1 to 18-4, respectively.
Since the relative spacing is set with high precision, the first and second substrates 11 and 12 are connected to the case 13.
placed closely on top.

As the circuits printed on the first and second substrates 11 and 12 become more complex and are densely formed on a limited area, the first and second substrates 1
Since circuits are printed at high density on the plate surfaces 1 and 12, engaging protrusions 16-3 and 16-4 are provided on the case 13 as shown in FIG. Engagement port 18-3 for the corresponding board,
There is no room to form 18-4. For this purpose, the engaging protrusions 16-3 and 16-4 are omitted and the case 1 is
3, the first substrate 11 has an opening 17-1.
0~17-40 part lamp 15-1~15-4
Since the second board 12 is fitted onto the case 13 and is disposed on the case 13, it does not lift up from the case 13, but as shown in FIG. It is placed in a floating state from 13.

If the flexible printed circuit board is disposed in a floating state with respect to the case 13 in this manner, it is not desirable because the instrument assembly operation cannot be carried out smoothly and cracks may occur in the circuit, causing disconnection or erroneous contact. For this purpose, as previously described and shown in FIG. the first and second substrates 11,1 of
Engagement openings 18-5 and 18-6 are formed on the plate surface of 2,
These engaging ports 18-5, 18-6 are connected to the engaging protrusions 16-
5 and 16-6 to prevent the second board 12 from floating up from the case 13.

However, in this conventional method, the mounting surface 13-H and the connecting surface 13-V are arranged at a predetermined angle with each other.
Engagement protrusions 16-1, 1 protruding perpendicularly to the plate surface
6-2, 16-5, and 16-6 must be formed. Since the case 13 is molded by a mold, if it were attempted to mold such a structure, the mold structure would become complicated and the manufacturing cost of the mold would increase significantly. Also, during assembly work, the substrate 11,
Twelve press-fitting steps are required, which increases the number of man-hours.

This invention solves the various problems with the conventional flexible printed circuit board mounting structure, and the engagement protrusion 18-V is connected to the connecting surface 13-V of the case 13.
To provide a mounting structure for a flexible printed circuit board that generally allows a plurality of flexible printed circuit boards to be stacked and arranged in close contact with the plate surface of a case 13 without providing a mounting structure for a flexible printed circuit board. be.

In this invention, a linear cut groove is formed along at least one side edge of a plurality of flexible printed circuit boards at a position corresponding to the connection surface of a plurality of flexible printed circuit boards disposed in opposition to each other. At least one side edge of the flexible printed circuit board is extended to form a rectangular engaging piece. In this invention, the rectangular engaging piece formed in this way is laterally inserted into the cut groove, and a plurality of flexible printed circuit boards are stacked and arranged.

Hereinafter, the flexible printed circuit board mounting structure of this invention will be explained in detail based on an embodiment thereof with reference to the drawings.

FIG. 4 shows an embodiment of the flexible printed circuit board mounting structure of this invention, with the same reference numerals assigned to the same parts as those of the conventional one. A case is shown in which the second two flexible printed circuit boards 11 and 12 are arranged on the case 13 in an overlapping manner.

As shown in FIG. 6, the first substrate 11 used in this embodiment has openings 17-10 to 17-40 at positions corresponding to the lamps 15-1 to 15-4. -1 to 15-4, and are formed into shapes that can be engaged with the lamps 15-1 to 15-4, respectively. Similarly, the engaging ports 18-1, 18-2, and 18-7 corresponding to the engaging projections 16-1, 16-2, and 16-7 each have a diameter slightly smaller than the outer diameter of the shaft of the engaging projection. It is formed. In this invention, the first board 11 is the case 1
In the portion disposed on the connecting surface 13-V of No. 3, the side edge on the side where the engagement port 18-2 is formed is extended to form a side edge 21, and a first side edge 21 is formed on this side edge 21. A kerf 22 is formed along the longitudinal direction of the substrate 11 .

On the other hand, in the second substrate 12, openings 17-1 to 17-4 having a diameter slightly larger than the external shape of the lamps 15-1 to 15-4 are provided at positions corresponding to the lamps 15-1 to 15-4, as in the conventional one. is formed. In addition, an engagement opening 18 is provided at a position where both side edges sandwiching the opening 17-1 protrude and extend corresponding to the engagement protrusions 16-1 and 16-2.
-1 and 18-2, and an engagement opening 18-7 is formed at a position corresponding to the engagement protrusion 16-7, as in the conventional one.

In this invention, the connecting surface 13-V of the second substrate 12
In the portion disposed above, the side edge of the second substrate 12 on the side where the engagement opening 18-2 is formed is extended to protrude to form the engagement piece 23. The length of the engaging piece 23 in the extending direction is set to be sufficiently larger than the length of the side edge 21 formed on the first substrate 11 in the extending direction, and the width perpendicular to the extending direction of the engaging piece 23 is The length is set smaller than the length of the cut groove 22 formed in the first substrate 11.

Engagement ports 18-1, 18- for case 13
2 and 18-7 respectively to the engagement protrusions 16-1 and 16
-2, 16-7 and openings 17-10, 1
7-20, 17-30 respectively lamp 15-
1, 15-2, 15-3, and 15-4, the first substrate 11 is fixedly disposed. The engaging protrusions 16-1, 16-2, 16- on the first substrate 11 disposed on the case 13 in this manner
7 have engaging ports 18-1, 18-2, 18-, respectively.
7 is engaged, and the second substrate 12 is fixedly disposed so as to surround the lamps 15-1 to 15-4 with the openings 17-1 to 17-4, respectively. Further, the engagement piece 23 of the second substrate 12 is inserted laterally into the cut groove 22 of the first substrate 11, and the engagement piece 23 portion presses the second substrate 12 against the first substrate 11 side.

By fixing the first and second substrates 11 and 12 to the case 13 in this way, in this invention, the engaging protrusion 1 is attached to the connecting surface 13-V portion.
Even if 6-5 and 16-6 are not provided, the first and second substrates 11 and 12 are fixedly disposed in close contact with the case 13.

In the embodiment, the first substrate 11 is provided with a groove 22 at one location, whereas the second substrate 1 is provided with a groove 22 at one location.
2 has been described, but for example, in FIG.
A cut groove is also provided on the side edge opposite to the side edge where the second substrate 12 is formed, and engaging pieces are formed on both side edges of the second substrate 12, so that the first and second substrates 11 and 12 are connected to each other. It is also possible to realize a structure in which the casing 13 is engaged with both side edge portions and is disposed in closer contact with the case 13.

Generally, the structure is such that a plurality of flexible printed circuit boards are stacked one on top of the other. form a mating piece, and engage this engaging piece with the cut groove of the bottom layer board to sandwich the board disposed between the bottom layer board and the top layer board, and attach it to the case. It is also possible to construct a structure in which a plurality of substrates are disposed in close contact with each other.

Alternatively, as shown in FIG. 7, the bottom layer substrate B-1 is provided with a cut groove 22-1, the top layer substrate B-4 is provided with an engaging piece 23-3, and the intermediate layer between them is formed. Each of the substrates 13-2 and 13-3 of the layer has a groove 2.
2-2, 22-3 and engaging pieces 23-2, 23-3 are formed, and the engaging pieces are engaged with the grooves of the substrates located in the lower layer sequentially from the top layer board to form the whole into a case. It is also possible to realize a structure in which the device is placed in close contact with the device.

In addition, in the example, the mounting structure of a flexible printed circuit board arranged on the back side of a vehicle's instrument panel was explained. When they are arranged opposite each other on a board,
The flexible printed circuit board mounting structure of this invention is applicable.

As explained in detail above, according to this idea,
To provide a mounting structure for a flexible printed circuit board, which has a simple structure and can stably fix and arrange a plurality of flexible printed circuit boards in close contact with each other at a predetermined arrangement position on a mounting surface. Is possible.

[Brief explanation of drawings]

1 to 3 are perspective views showing a conventionally proposed mounting structure for a flexible printed circuit board, FIG. 4 is a perspective view showing the configuration of an embodiment of the flexible printed circuit board mounting structure of this invention, and FIG. 5 6 is a perspective view showing the configuration of a second board used in an embodiment of the flexible printed circuit board mounting structure of this invention, and FIG. 6 is a first board used in an embodiment of the flexible printed circuit board mounting structure of this invention. FIG. 7 is a perspective view showing the structure of another embodiment of the flexible printed circuit board mounting structure of this invention. 11: first substrate, 12: second substrate, 13:
Case, 15-1 to 15-4: Lamp, 16-1
~16-7: Engagement protrusion, 17-10 ~ 17-4
0: Opening, 17-1 to 17-4: Opening, 18-1
~18-7: Engagement port, 21: Side edge, 22: Cut groove, 23: Engagement piece.

Claims (1)

[Scope of utility model registration request] A plurality of flexible printed circuit boards are stacked on top of a case that has mounting surfaces arranged parallel to each other and a connecting surface that connects the mounting surfaces at a predetermined angle. In the flexible printed circuit board mounting structure, a linear cut groove is formed along the side edge of at least one flexible printed circuit board at a position corresponding to the connection surface, and the flexible printed circuit board with the cut groove formed therein is provided. The side edges of the flexible printed circuit boards facing each other on the cut groove side are extended to protrude to form a rectangular engagement piece, and this engagement piece is laterally inserted into the cut groove to connect the plurality of A mounting structure for a flexible printed circuit board, characterized in that flexible printed circuit boards are mutually arranged.