JP2024069011A - Wiring board and connector - Google Patents

Abstract

[Problem] To provide a wiring board and connector that can ensure good insulation performance while suppressing costs. [Solution] The wiring board and connector have a substrate 20 and a plurality of conductors 30 arranged in parallel on at least one surface 21 of the substrate 20 and with exposed ends, and the conductors 30 have chamfered portions 41 at the corners between the side surface 31 and the tip surface 32. [Selected Figure] Figure 2

Description

The present invention relates to a wiring board and a connector.

Patent Document 1 discloses a printed wiring board in which grooves are formed in an insulating substrate in a connection area where multiple connection terminals are exposed, thereby lengthening the creepage distance between the connection terminals.

JP 2007-149889 A

In the above-mentioned printed wiring board, the insulation performance can be improved by increasing the creepage distance between the connection terminals, but the cost increases because grooves must be formed in the insulating substrate.

In addition, if the tracking resistance of the insulating substrate is low, the insulation performance can be improved by increasing the creepage distance through the formation of grooves. However, if the tracking resistance of the insulating substrate is high, the effect of improving the insulation performance cannot be expected very much even if the creepage distance is increased by forming grooves. Moreover, even if the creepage distance is increased by forming grooves in the insulating substrate, the spatial distance between the connection terminals cannot be increased, and there is a limit to the improvement of the insulation performance.

The present invention was made in consideration of the above-mentioned circumstances, and its purpose is to provide a wiring board and connector that can ensure good insulation performance while keeping costs down.

The above object of the present invention is achieved by the following configuration.

A substrate;
A plurality of conductors arranged in parallel on at least one surface of the substrate and having exposed ends;
having
The conductor has chamfered corners between the side surface and the tip surface.

The present invention provides a wiring board and connector that can ensure good insulation performance while keeping costs down.

The present invention has been briefly described above. The details of the present invention will become clearer by reading the following description of the embodiment of the invention (hereinafter referred to as "embodiment") with reference to the attached drawings.

FIG. 1 is a perspective view of an end portion of a wiring board according to the present embodiment. FIG. 2 is a perspective view of a connection portion of the wiring board. FIG. 3 is a front view of the connection portion of the wiring board. FIG. 4 is a perspective view of a connection portion of the wiring board. FIG. 5 is a front view of the connection portion of the wiring board. FIG. 6 is a schematic diagram showing a conductor having corners and a conductor whose corners have been cut. FIG. 7 is a perspective view of a connector including a wiring board according to this embodiment. FIG. 8 is a perspective view of the first housing as viewed from the rear surface side.

Specific embodiments of the present invention are described below with reference to the drawings.

Figure 1 is a perspective view of an end portion of a wiring board according to this embodiment. Figure 2 is a perspective view of a connection portion of the wiring board. Figure 3 is a front view of the connection portion of the wiring board.

As shown in Figures 1 to 3, the wiring board 10 according to this embodiment is a flat circuit body having a substrate 20 and a plurality of conductors 30, for example a flexible printed circuit (FPC). The substrate 20 is formed from a flexible insulating resin sheet, and the conductors 30 are provided on one surface 21 of the substrate 20. An insulating protective film 22 is attached to the surface 21 of the substrate 20 on which the conductors 30 are provided, so that the conductors 30 are covered and protected by the protective film 22.

The conductors 30 are formed from a conductive metal film formed on one surface 21 of the substrate 20, and the circuit wiring is formed from the conductors 30. The conductors 30 are formed by subjecting the substrate 20 to electroless plating or the like. Each conductor 30 is formed long and has a width W, and is arranged in parallel with a gap between each other that is the inter-conductor distance G.

The wiring board 10 has a terminal portion serving as a connection portion 11, and a portion of the protective film 22 has been removed from this connection portion 11. As a result, the ends of the conductors 30 arranged in parallel with each other are exposed at the connection portion 11.

In the connection portion 11, each conductor 30 has a chamfered portion 41 at the corner between the side surface 31 and the tip surface 32. This chamfered portion 41 is composed of a curved surface that is arc-shaped in a plan view and connects the side surface 31 and the tip surface 32. This chamfered portion 41 can be easily formed when the conductor 30 is provided on the substrate 20 by electroless plating, without being formed by post-processing.

The conductor 30 also has a chamfered portion 42 at the corner between its surface 33 and side surface 31, which is a curved surface that is arc-shaped in cross section.

In the above embodiment, the chamfered portions 41, 42 are provided at the corners between the side surface 31 and the tip surface 32 of the conductor 30, and at the corners between the surface 33 and the side surface 31 of the conductor 30, respectively, but the chamfered portions 41, 42 are not limited to curved surfaces.

For example, as shown in FIG. 4, the chamfered portion 41 at the corner between the side surface 31 and the tip surface 32 of the conductor 30 may be a plane connecting the side surface 31 and the tip surface 32, and as shown in FIG. 5, the chamfered portion 42 at the corner between the surface 33 and the side surface 31 of the conductor 30 may be a plane connecting the surface 33 and the side surface 31.

The breakdown voltage between adjacent conductors varies depending on the shape of the conductors. In other words, it is believed that there is a correlation between the breakdown voltage between conductors and the shape of the conductors. For example, if a conductor has corners, the more obtuse the corners are, the higher the voltage at which breakdown occurs. Also, conductors with rounded shapes are less likely to discharge.

Here, as shown in FIG. 6, a flexible printed circuit board was prepared in which conductors D1 (the conductor on the left in FIG. 6) having corners C of approximately 90° were arranged, and a flexible printed circuit board was prepared in which conductors D2 (the conductor on the right in FIG. 6) having corners C cut at approximately 45° were arranged, and the voltage at the time of dielectric breakdown between conductors D1 and the voltage at the time of dielectric breakdown between conductors D2 were measured. As a result, the dielectric breakdown voltage was higher in the case of conductor D2 having corners C cut at approximately 45° than in the case of conductor D1 having corners C of approximately 90°.

Due to this correlation between the breakdown voltage and the shape of the conductor, by forming the corners of the conductors 30 into chamfered portions 41 consisting of arc-shaped curved surfaces or flat surfaces, as in this embodiment, breakdown is less likely to occur between the conductors 30 even at high voltages.

According to the wiring board 10 configured as described above, the conductor 30 has a chamfered portion 41 consisting of a curved or flat surface that connects the side surface 31 and the tip surface 32 at the corner between the side surface 31 and the tip surface 32, so that the occurrence of insulation breakdown between adjacent conductors 30 is suppressed. This ensures good insulation performance while keeping costs down compared to when grooves are formed in the board between the conductors to increase the creepage distance. In addition, because the insulation performance between the conductors 30 can be improved, the pitch of the arrangement of the conductors 30 can be narrowed to make the board smaller.

In addition, by forming a chamfered portion 42 consisting of a curved or flat surface that connects the front surface 33 and the side surface 31 on the conductor 30, better insulation performance can be ensured while keeping costs down.

Next, a connector 100 including the wiring board 10 will be described.
Fig. 7 is a perspective view of a connector including a wiring board according to the present embodiment, and Fig. 8 is a perspective view of a first housing as viewed from the rear side.

As shown in Figures 7 and 8, the wiring board 10 has a first housing 51 attached to its end. This first housing 51 can be fitted into a second housing 52, and the first housing 51 and the second housing 52 together form the connector 100.

The first housing 51, which is attached to the end of the wiring board 10, has a housing body 61 and a cover 62. The housing body 61 and the cover 62 are each molded from an insulating synthetic resin.

The housing body 61 and the cover 62 are assembled so as to clamp the end of the wiring board 10. The housing body 61 has locking claws 63 formed on both sides. The cover 62 has locking pieces 64 on both sides that extend toward the side where the cover 62 is to be assembled to the housing body 61, and these locking pieces 64 have locking holes 65 formed therein.

When the housing body 61 and the cover 62 are assembled to clamp the end of the wiring board 10, the locking claws 63 enter the locking holes 65 and lock the locking pieces 64. This allows the first housing 51, consisting of the housing body 61 and the cover 62, to be attached to the end of the wiring board 10.

The housing body 61 has a connection plate portion 66 that protrudes toward the tip, and the connection portion 11 of the wiring board 10 is arranged and held along the underside of the connection plate portion 66. The connection portion 11 of the wiring board 10 held by this connection plate portion 66 is arranged with the exposed side of the conductor 30 facing downward.

The housing body 61 also has a lock arm 68 with a lock hole 67 formed in the center of its upper part.

The second housing 52 is mounted on a circuit board 71 such as a printed wiring board. The second housing 52 is molded from an insulating synthetic resin, and has a connection port 72 formed on the front side. The second housing 52 has a plurality of terminal portions 73 inside the connection port 72. These terminal portions 73 are arranged at the same pitch as the plurality of conductors 30 of the wiring board 10, and are electrically connected to the conductor pattern (not shown) of the circuit board 71. The second housing 52 also has a locking claw 74 on its upper surface that engages with a locking hole 67 formed in a locking arm 68 of the first housing 51.

To connect the first housing 51 and the second housing 52 in the connector 100 configured as described above, the connection plate portion 66 of the housing body 61 of the first housing 51 is inserted into the connection port 72 of the second housing 52 to fit them together. Then, the conductors 30 of the connection portion 11 of the wiring board 10 held by the connection plate portion 66 come into contact with the terminal portions 73 arranged inside the connection port 72, and are electrically connected to each other.

In addition, when the first housing 51 and the second housing 52 are fitted together, the locking claw 74 of the second housing 52 engages with the locking hole 67 formed in the locking arm 68 of the first housing 51. This maintains the fitted state between the first housing 51 and the second housing 52.

This connector 100 ensures good insulation performance at low cost and can be made compact without special processing.

The wiring board 10 according to this embodiment can be used not only for the connector 100 but also for wiring in various units. Even in the case of a unit equipped with this wiring board 10, good insulation performance can be ensured at low cost, and the size can be reduced without special processing.

The present invention is not limited to the above-described embodiment, and can be modified, improved, etc. as appropriate. In addition, the material, shape, size, number, location, etc. of each component in the above-described embodiment are arbitrary as long as they can achieve the present invention, and are not limited.

Here, the features of the wiring board and connector according to the above-described embodiment of the present invention will be briefly summarized and listed in the following [1] to [5].
[1] A substrate (20);
A plurality of conductors (30) arranged in parallel on at least one surface (21) of the substrate (20) and having exposed ends;
having
The conductor (30) has a chamfered portion (41) at the corner between the side surface (31) and the tip surface (32).

According to the wiring board of the configuration of [1] above, the conductor has chamfered corners between the side and tip surfaces, which reduces the occurrence of dielectric breakdown between adjacent conductors. This ensures good insulation performance while keeping costs down compared to when grooves are formed in the board between the conductors to increase the creepage distance. In addition, because the insulation performance between the conductors can be improved, the pitch of the conductor arrangement can be narrowed to make the board smaller.

[2] The chamfered portion (41) is a curved surface or a flat surface connecting the side surface (31) and the tip surface (32),
The wiring board according to the above [1].

According to the wiring board of the configuration [2] above, by forming a chamfered portion consisting of a curved or flat surface connecting the side surface and the tip surface on the conductor, it is possible to ensure good insulation performance while keeping costs down.

[3] The conductor (30) has a chamfered portion (42) consisting of a curved surface or a flat surface connecting the surface (33) and the side surface (31) at a corner between the surface (33) and the side surface (31).
The wiring board according to the above [1].

According to the wiring board of the configuration [3] above, by forming a chamfered portion consisting of a curved or flat surface connecting the front surface and the side surface on the conductor, it is possible to ensure good insulation performance while keeping costs down.

[4] The substrate (20) is flexible.
The wiring board according to any one of the above [1] to [3].

The wiring board of the above configuration [4] provides a flexible wiring board that ensures good insulation performance between the conductors.

[5] A first housing (51) including the wiring board (10) according to [4] above;
a second housing (52) having a plurality of terminal portions (73), and into which the first housing (51) is fitted so that the terminal portions (73) come into contact with the conductors (30) of the wiring board (10);
A connector comprising:

The connector with the configuration [5] above can ensure good insulation performance at low cost, and can be made compact without special processing.

REFERENCE SIGNS LIST 10 wiring board 20 substrate 21 one surface 30 conductor 31 side surface 32 tip surface 33 surface 41, 42 chamfered portion 51 first housing 52 second housing 73 terminal portion 100 connector

Claims (5)

A substrate;
A plurality of conductors arranged in parallel on at least one surface of the substrate and having exposed ends;
having
The conductor has a chamfered portion at a corner between a side surface and a tip surface.
Wiring board. The chamfered portion is a curved surface or a flat surface connecting the side surface and the tip surface.
The wiring board according to claim 1 . The conductor has a chamfered portion at a corner between the surface and the side surface, the chamfered portion being a curved surface or a flat surface connecting the surface and the side surface.
The wiring board according to claim 1 . The substrate is flexible.
The wiring board according to claim 1 . A first housing including the wiring board according to claim 4;
a second housing having a plurality of terminal portions, the conductors of the wiring board coming into contact with the terminal portions when the first housing is fitted into the second housing;
Equipped with
connector.

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