JP2026049832A - Circuit board for cable routing - Google Patents

Abstract

[Problem] One embodiment provides a wiring substrate that can be made lower in height.
[Solution] The wiring substrate comprises an insulating base plate, an electrical element held on the base plate, and a fixing device for connecting the base plate and the electrical element. The base plate comprises a first surface, a second surface, and a housing portion formed on the first surface. The electrical element is formed in a columnar shape with an axis as its center, extends in the axial direction, and has an electrical element body housed in the housing portion, and a connecting portion connected to the electrical element body and connected to the base plate by the fixing device. The housing portion is recessed from the first surface toward the second surface in a first direction intersecting the first surface, and has a mounting hole in which the electrical element body is housed, and a fixing portion to which the fixing device is fixed so as to connect the connecting portion. The fixing portion has a fixing surface along the first surface, and the fixing surface is positioned in the first direction at a position far from the second surface relative to the electrical element body housed in the mounting hole.
[Selection Diagram] Figure 2

Description

Embodiments of the present invention relate to a wiring substrate.

An electrical connection unit is known that has a housing for accommodating electronic components and a busbar attached to the housing in an upright position, as disclosed in Patent Document 1.

Japanese Patent Publication No. 2024-037492

By the way, further reductions in the height of electrical connection units are expected.

One embodiment provides a wiring substrate that can be made lower in profile.

One embodiment of a wiring substrate comprises an insulating base plate, an electrical element held on the base plate, and a fixing device connecting the base plate and the electrical element, wherein the base plate comprises a first surface on which the electrical element and the fixing device are arranged, a second surface facing the opposite side of the first surface, and a housing portion formed on the first surface that houses at least a part of the electrical element, wherein the electrical element is formed in a columnar shape with an axis as its center, extends in the axial direction of the axis, and comprises an electrical element body housed in the housing portion and the electrical The electrical element body is connected to a connecting portion, which is connected to the base plate by the fixing device. The housing portion has a mounting hole that is recessed from the first surface toward the second surface in a first direction intersecting the first surface, and contains the electrical element body; and a fixing portion to which the fixing device is fixed so as to connect the connecting portion. The fixing portion has a fixing surface along the first surface, and the fixing surface is positioned in the first direction, farther from the second surface than the electrical element body housed in the mounting hole.

According to one embodiment, the height of the wiring substrate can be reduced.

A perspective view showing a wiring substrate of an embodiment. A perspective view showing the wiring substrate of the embodiment, excluding the cover portion. A perspective view showing a partially disassembled wiring substrate of the embodiment. An enlarged view showing the housing section of the embodiment. A magnified view of a portion of Figure 2. Cross-sectional view along the line VI-VI shown in Figures 1 and 5.

The embodiments will be described below with reference to the drawings. In the following description, components having the same or similar functions will be denoted by the same reference numerals. Duplication of these components may be omitted. Note that the components described below do not limit the scope of the embodiments.

In this disclosure, terms are defined as follows: “Connection” may include, but is not limited to, a mechanical connection; it may also include, an electrical connection. That is, “Connection” may include, but is not limited to, a case where two elements to be connected are directly connected; it may also include a case where two elements to be connected are connected with another element in between. “Accommodation” may include, but is not limited to, a case where only a portion of a component is accommodated (with the remaining portion of the component protruding). “Parallel,” “Orthogonal,” or “Same” may include “Approximately parallel,” “Approximately orthogonal,” or “Approximately the same,” respectively.

In this disclosure, the +X direction, -X direction, +Y direction, -Y direction, +Z direction, and -Z direction are defined as follows: The X direction is one direction within the plane in which the base plate 10, described later, extends. The +X direction is one of the X directions. The -X direction is the direction opposite to the +X direction. Hereinafter, when the +X direction and the -X direction are not distinguished, they will simply be referred to as the "X direction". The Y direction is a direction that intersects (for example, is perpendicular to) the X direction within the plane in which the base plate 10, described later, extends. The +Y direction is one of the Y directions. The -Y direction is the direction opposite to the +Y direction. Hereinafter, when the +Y direction and the -Y direction are not distinguished, they will simply be referred to as the "Y direction". The +Z direction and the -Z direction are directions that intersect (for example, are perpendicular to) the X direction and the Y direction. The +Z direction is the direction from the second surface 12 to the first surface 11 in the base plate 10, described later. The -Z direction is the opposite direction to the +Z direction. In the following, when the +Z and -Z directions are not distinguished, they will simply be referred to as the "Z direction." The Z direction is an example of the "first direction."

In the following, when the X and Y directions are not distinguished, they may be referred to as the "horizontal direction." In the following, the Z direction may be referred to as the "vertical direction." Furthermore, in the following, the +Z direction may be referred to as "up," and the -Z direction as "down." However, these expressions are for explanatory convenience only and do not limit the direction of gravity of the cable routing substrate 1 (the installation orientation of the cable routing substrate 1).

(Embodiment)
<1. Configuration of the wiring circuit board>
Figure 1 is an overall view of the wiring substrate 1 of the embodiment. Figure 2 is an overall view of the wiring substrate 1 of the embodiment excluding the cover portion 50. Furthermore, Figure 3 is a perspective view showing the wiring substrate 1 partially disassembled. The wiring substrate 1 is a member that forms at least a portion of the electrical conduction paths between electronic components and/or at least a portion of the electrical conduction paths between electronic components and external devices and/or at least a portion of the electrical conduction paths between external devices. In this disclosure, "wiring substrate" means a substrate-type wiring structure. "Substrate-type" means that, when viewed as a whole, regardless of the fine shape, it is in the shape of a plate along a single plane. In this disclosure, "plate-like" is not limited to the case where it is perfectly flat, but may include the case where there are fixing structures or ribs protruding in the Z direction. In this embodiment, the wiring substrate is in the shape of a plate along the X and Y directions.

Furthermore, the wiring circuit board 1 is applicable to in-vehicle equipment installed in vehicles such as EVs (Electric Vehicles), HEVs (Hybrid Electric Vehicles), or PHEVs (Plug-in Hybrid Electric Vehicles). Such in-vehicle equipment is connected to multiple external devices. The in-vehicle equipment with the wiring circuit board 1 mediates the connections between these multiple external devices. In other words, the wiring circuit board 1 is used in electrical connection units, such as those referred to as "electrical connection boxes" or "junction boxes." However, the electrical connection unit is not limited to a box-shaped device.

Here, "external equipment" may include, for example, a battery pack containing multiple batteries, equipment including an inverter for driving the vehicle's motor, and a charger, which is equipment for supplying power to charge the battery pack.

The wiring substrate 1 according to this embodiment comprises a base plate 10, an electrical element 20, a pair of busbars 30, a fixing device 40, and a cover portion 50.

(Base plate)
The base plate 10 is a retaining member to which various parts described later can be attached. The base plate 10 extends in the X and Y directions. The main part of the base plate 10 has multiple ribs inside and is formed in a plate shape along the horizontal direction. The base plate 10 is made of synthetic resin, for example, and has insulating properties. The base plate 10 has a first surface 11, a second surface 12, and a housing portion 13.

The first surface 11 is the surface of the base plate 10 facing one side in the first direction, i.e., the +Z direction. The first surface 11 is one side surface of the base plate 10 and is a plane that aligns with the horizontal direction. The first surface 11 can be fitted with the electrical element 20 (described later), the fixing device 40, and the pair of busbars 30.
The second surface 12 is the surface of the base plate 10 facing the other side (opposite side) of the first direction, i.e., the -Z direction. The second surface 12 is the surface of the base plate 10 facing the opposite side from the first surface 11, and is a plane that aligns with the horizontal direction. In other words, the first surface 11 and the second surface 12 extend perpendicular to the Z direction.

The housing section 13 is formed to accommodate at least a portion of the electrical element 20. Figure 4 shows an enlarged view of the vicinity of the housing section 13. The housing section 13 is formed on the first surface 11 of the base plate 10. The housing section 13 is capable of fixing the electrical element 20. The housing section 13 has mounting holes 14 and fixing parts 17.

The fixing portion 17 can secure the fixing device 40, which will be described later. Furthermore, the fixing portion 17 can secure the fixing device 40 so as to connect the connecting portion 22 and the busbar 30, which will be described later. The fixing portion 17 has a fixing surface 18. The fixing surface 18 extends along the first surface 11. In this embodiment, the fixing surface 18 extends parallel to the first surface 11. In the Z direction, the fixing surface 18 is positioned farther from the second surface 12 relative to the electrical element body 21, which will be described later. In other words, the fixing surface 18 is positioned further from the second surface 12 relative to the first surface 11 in the Z direction. The fixing portion 17 is provided in pairs, spaced apart from the mounting hole 14 in the X direction.

In this embodiment, the fixing portion 17 is a nut. The fixing portion 17 is fixed in a state where it is housed in a hole formed in the first surface 11. Furthermore, in this embodiment, a pair of fixing portions 17 are arranged in the +X direction and the -X direction relative to the mounting hole 14. That is, relative to the mounting hole 14, the first fixing portion 17a is arranged in the +X direction, and the second fixing portion 17b is arranged in the -X direction. Also, regarding the fixing surface 18, the side with the first fixing portion 17a is designated as the first fixing surface 18a, and the side with the second fixing portion 17b is designated as the second fixing surface 18b. In this embodiment, the first fixing surface 18a and the second fixing surface 18b are located at separate positions in the X direction and extend on the same plane.

The mounting hole 14 is part of the base plate 10 and is formed as a recess from the first surface 11 toward the second surface 12 (towards the -Z direction). Furthermore, in this embodiment, the mounting hole 14 is formed in a position recessed toward the -Z direction relative to the fixing surface 18. The mounting hole 14 is formed to extend horizontally. The mounting hole 14 can accommodate the electrical element body 21, which will be described later. The mounting hole 14 has a bottom surface 15 and a side surface 16.

The bottom surface 15 is a surface that extends in the same direction as the first surface 11 within the mounting hole 14. The bottom surface 15 extends horizontally. The bottom surface 15 is formed along the fixed surface 18. In this embodiment, the bottom surface 15 is formed parallel to the fixed surface 18. In the Z direction, the bottom surface 15 extends toward the electrical element 20 (electrical element body 21) housed inside the mounting hole 14. In the Z direction, the bottom surface is positioned close to the second surface 12 relative to the fixed surface 18. Furthermore, the bottom surface 15 is formed so as not to contact the electrical element 20 when the electrical element 20 is housed in the housing portion 13.

The side surface 16 is a surface extending from the bottom surface 15 in the +Z direction. Multiple side surfaces 16 are formed around the bottom surface 15 at the mounting holes 14. Of the side surfaces 16, side surfaces 16A, which face each other in the X direction, extend from the bottom surface 15 toward the fixing surface 18. Furthermore, of the side surfaces 16, the surfaces facing each other in the Y direction are designated as side surfaces 16B. In this embodiment, side surfaces 16B have a first projection 16a and a second projection 16b.

The first projection 16a and the second projection 16b extend in the Y direction from the side surface 16B toward the interior of the mounting hole 14. The first projection 16a and the second projection 16b are capable of holding the ends 21a and 21b (described later) of the electrical element body 21. Specifically, the first projection 16a and the second projection 16b are each formed as a pair. The first projection 16a and the second projection 16b are formed spaced apart from each other in the X direction. With respect to the center of the mounting hole 14 in the X direction, the first projection 16a is formed in the +X direction, and the second projection 16b is formed in the -X direction. The pair of first projections 16a have projection surfaces 161. The projection surfaces 161 extend in the X and Z directions. The projection surfaces 161 of the pair of first projections 16a contact and hold the end 21a of the electrical element body 21 from the Y direction.

Similarly, the pair of second protrusions 16b have protruding surfaces 163. These protruding surfaces 163 extend in the X and Z directions. The protruding surfaces 163 of the pair of second protrusions 16b hold the end portion 21b of the electrical element body 21 by contacting and clamping it from the Y direction.

(Electrical elements)
The electrical element 20 is held on the base plate 10. The electrical element 20 is also positioned on the first surface 11 side. The electrical element 20 according to this embodiment is, for example, a fuse. The electrical element 20 has an electrical element body 21 and a connection portion 22.

The electrical element body 21 is formed in a columnar shape centered on an axis. The electrical element body 21 extends in the axial direction of the axis. In this embodiment, the axis extends parallel to the X direction; that is, the axial direction is the X direction. The entire electrical element body 21 is housed inside the mounting hole 14. The electrical element body 21 has a first end 21a and a second end 21b.

The first end 21a and the second end 21b are electrical terminal portions of the electrical element body 21. The first end 21a and the second end 21b include the end faces of the electrical element body 21 in the X direction. The end faces are surfaces facing outwards in the X direction. The first end 21a and the second end 21b are formed spaced apart in the +X and -X directions. With respect to the center of the electrical element body 21 in the X direction, the first end 21a is formed in the +X direction and the second end 21b is formed in the -X direction. Therefore, the first end 21a and the second end 21b each include end faces facing in various directions in the X direction. The electrical element body 21 is connected to the connection portion 22 at the first end 21a and the second end 21b.

The connection portion 22 is connected to the electrical element body 21. The connection portion 22 can be connected to the base plate 10 by a fixing device 40. A pair of connection portions 22 are arranged spaced apart in the +X and -X directions. For convenience, the connection portion 22 located on the +X side is referred to as the first connection portion 22a, and the connection portion 22b located spaced apart from the first connection portion 22a on the -X side is referred to as the second connection portion 22b. The connection portion 22 according to this embodiment includes a first member 23 and a second member 24.

The first member 23 is connected to the electrical element body 21 (first end 21a and second end 21b). When viewed from the axial direction, the first member 23 is positioned away from the electrical element body 21. The first member 23 extends from the first end 21a and the second end 21b in a direction intersecting the axial direction (+Z direction). The first member 23 is connected to the second member 24 at its +Z direction end. For convenience, the first connection portion 22a is assumed to have one side having the first member 23a, and the other side having the first member 23b. One side of the first member 23a is connected to the first end 21a. The other side of the first member 23b is connected to the second end 21b.

The second member 24 extends axially (in the X direction) from the first member 23. The second member 24 extends away from the electrical element body 21. Here, for convenience, the second member 24 connected to one side of the first member 23a will be called the one-side second member 24a, and the second member 24 connected to the other side of the first member 23b will be called the other-side second member 24b. Specifically, the one-side second member 24a extends in the +X direction from the one-side first member 23a. The other-side second member 24b extends in the -X direction from the other-side first member 23b. The one-side second member 24a and the other-side second member 24b extend in opposite directions in the X direction. The second member 24 has a through hole formed in the Z direction such that, when viewed from the Z direction with the electrical element body 21 housed in the mounting hole 14, it overlaps with the hole (nut hole) of the fixing part 17. The second member 24 is connected to the fixing surface 18 by a fixing device 40. Furthermore, the second member 24 is positioned above the mounting hole 14 when the electrical element body 21 is housed in the mounting hole 14. In this embodiment, one second member 24a and the other second member 24b are located on the same plane, but this is not limited to this configuration.

(Bus bar)
The busbar 30 is a wiring member (electrical connection member) provided on the base plate 10. The busbar 30 is, for example, a wiring member for electrically connecting multiple electronic components. The busbar 30 is physically and electrically connected to the electrical element 20. The busbar 30 is made of metal (for example, copper or a copper alloy) and is conductive. The busbar 30 is held in place by the base plate 10. The busbar 30 is integrated with the base plate 10 without the use of fastening members such as screws or bolts. The busbar 30 may be integrated with the base plate 10 by, for example, insert molding. The busbar 30 has a first busbar 31 and a second busbar 32.

The first busbar 31 and the second busbar 32 are spaced apart from each other. Furthermore, the first busbar 31 and the second busbar 32 are electrically connected via an electrical element 20. The first busbar 31 has a through-hole formed in the Z direction such that, when viewed from the Z direction, it overlaps with the hole in the first fixing part 17a while fixed to the base plate 10. The second busbar 32 has a through-hole formed in the Z direction such that, when viewed from the Z direction, it overlaps with the hole in the second fixing part 17b while fixed to the base plate 10.

(Fixing fixture)
The fastener 40 is a component that can connect the base plate 10 and the electrical element 20. The fastener 40 according to this embodiment is, for example, a bolt having a shaft portion 41 and a head portion 42. The shaft portion 41 is formed so that it can be inserted through the through hole of the second member 24 and the through hole of the bus bar 30. The shaft portion 41 has screw grooves on its outer circumferential surface. The shaft portion 41 can be screwed into the fixing portion 17. The head portion 42 has a larger diameter than the shaft portion 41. Furthermore, the head portion 42 is formed so that it cannot be inserted through the through hole of the second member 24 and the through hole of the bus bar 30.
As shown in Figures 5 and 6, the fixing device 40 is fixed to the base plate 10 such that the fixing part 17, bus bar 30, electrical element 20 (second member 24), and head 42 are arranged in the order from the -Z direction to the +Z direction.

(Cover section)
The cover portion 50 is positioned to cover the first surface 11. Specifically, the cover portion 50 covers the electrical element 20 in the Z direction, sandwiching it with the base plate 10. The cover portion 50 is made of, for example, synthetic resin and has insulating properties. The cover portion 50 is positioned, for example, as a member for preventing fingers from touching the current-carrying path in an electrical connection unit in which a wiring substrate 1 is used. The cover portion 50 according to this embodiment has an intermediate plate 51 and a main cover 52.

The intermediate plate 51 is positioned between the main cover 52 and the base plate 10. The intermediate plate 51 can electrically connect the wiring substrate 1 to its exterior. The intermediate plate 51 has grooves formed therein for routing wires extending from the outside. In this embodiment, the intermediate plate 51 does not cover the electrical element 20 when viewed from the +Z direction.

The main cover 52 covers the base plate 10 and the intermediate plate 51 from the +Z direction. That is, the main cover 52 covers the intermediate plate 51 by sandwiching it between the base plate 10 in the Z direction. Furthermore, the main cover 52 can cover the wires routed to the intermediate plate 51. The main cover 52 has an opposing surface 53 facing the electrical element body 21 in the Z direction. The opposing surface 53 extends horizontally. The opposing surface 53 is positioned so as not to contact the fixing device 40. Also, the distance L between the opposing surface 53 and the second member 24 is shorter than the Z-direction length of the portion of the electrical element 20 excluding the second member 24. That is, the distance L between the opposing surface 53 and the second member 24 is shorter than the Z-direction length of the electrical element body 21 and the first member 23.

<2. Advantages>
In this embodiment, the wiring substrate 1 comprises a base plate 10, an electrical element 20, and a fixing device 40. The base plate 10 has a first surface 11, a second surface 12, and a housing portion 13. The electrical element 20 has an electrical element body 21 and a connection portion 22. The housing portion 13 has a mounting hole 14 that is recessed in the Z direction from the first surface 11 toward the second surface 12, and a fixing portion 17 to which the fixing device 40 is fixed. The electrical element body 21 is housed in the mounting hole 14. The fixing portion 17 has fixing surfaces 18 (18a, 18b) parallel to the first surface 11. The fixing surfaces 18 (18a, 18b) are positioned in the Z direction, farther from the second surface 12 than the electrical element body 21. With this configuration, the electrical element 20 is configured such that the electrical element body 21 is not positioned above the mounting hole 14. This arrangement allows for a lower profile of the wiring substrate 1 compared to the case where the electrical element 20 is positioned upside down (with the electrical element body 21 positioned above the mounting hole 14).

In this embodiment, the mounting hole 14 is parallel to the fixing surface 18 (18a, 18b) and has a bottom surface 15 facing the electrical element body 21. The bottom surface 15 is positioned close to the second surface 12 relative to the fixing surface 18 (18a, 18b) in the Z direction. Furthermore, the fixing surface 18 (18a, 18b) is positioned so as not to contact the electrical element body 21. With this configuration, the electrical element 20 can be positioned without any stress being applied to it.

In this embodiment, the connection portion 22 (22a, 22b) has a first member 23 (23a, 23b) and a second member 24 (24a, 24b). The first member 23 (23a, 23b) extends from the electrical element body 21 in the +Z direction. The second member 24 (24a, 24b) extends horizontally from the first member 23 (23a, 23b). The second member 24 (24a, 24b) is connected to the base plate 10. With this structure, the extension of the first member 23 (23a, 23b) in the Z direction increases the distance of the electrical element 20 in the Z direction. Therefore, it is easier to distinguish when the electrical element 20 is placed upside down.

In this embodiment, the wiring substrate 1 further includes a cover portion 50 that sandwiches and covers the electrical element 20 in the Z direction with the base plate 10. The cover portion 50 (main cover 52) has an opposing surface 53 facing the electrical element body 21. The distance between the opposing surface 53 and the second member 24 in the Z direction is shorter than the length in the Z direction of the electrical element 20 excluding the second portion. With this structure, if the main cover 52 is attached with the electrical element 20 positioned upside down, the electrical element body 21 and the main cover 52 will interfere with each other. This mechanism allows the user to notice that the electrical element 20 is positioned upside down when attaching the main cover 52.

In this embodiment, the cable routing board 1 further comprises a first busbar 31 and a second busbar 32. The first busbar 31 and the second busbar 32 are electrically connected via an electrical element 20. The electrical element 20 is a fuse. This structure allows for a lower profile cable routing board 1 without making fuse replacement difficult.

In this embodiment, the ends 21a and 21b of the electrical element body 21 are held by the protrusions 16a and 16b. This structure allows for a unique positioning of the electrical element 20 during installation. Therefore, it is easier to secure it with the fixing device 40.

<3. Variations>
Next, we will describe some variations. Note that, apart from the configurations described below, the configurations in each variation are the same as those in the embodiment.

(First variation)
The connection portion 22 (22a, 22b) is not limited to a configuration having a first member 23 (23a, 23b) and a second member 24 (24a, 24b). For example, the connection portion 22 (22a, 22b) may have the second member 24 (24a, 24b) directly connected to the electrical element body 21. In this case, the first member 23 (23a, 23b) according to this embodiment is not provided.
Furthermore, in the first modified example, the distance in the Z direction between the opposing surface 53 and the connecting portion 22 (second member 24 (24a, 24b)) is shorter than the length of the electrical element body 21 in the Z direction.

This configuration allows for a reduction in the size of the electrical element 20 in the Z-direction. This shape also increases the design flexibility of the wiring substrate 1 (especially the base plate 10).
Furthermore, by setting the distance in the Z direction between the opposing surface 53 and the second member 24 (24a, 24b) as described above, the same effects as in this embodiment can be achieved. That is, when the main cover 52 is attached with the electrical element 20 positioned upside down, the electrical element body 21 and the main cover 52 interfere with each other. This mechanism allows the presence of the electrical element 20 in an upside-down position to be noticed when attaching the main cover 52.

(Second variation)
The wiring substrate 1 may be configured without a cover portion 50. Alternatively, it may be configured without either the main cover 52 or the intermediate plate 51.

This structure allows for a lower profile of the cable routing substrate 1, even without the cover portion 50.

(Third variation)
The bottom surface 15 may be formed to be in contact with the electrical element 20 when the electrical element 20 is housed in the housing portion 13.

This structure allows the housing portion 13 to be made shorter in the Z direction. Therefore, the base plate 10 can be made thinner. It is desirable that the bottom surface 15 and the electrical element 20 are in contact while the stress applied to the electrical element 20 is small.

(Fourth variation)
The protruding surfaces 161 and 163 may be formed so as not to come into contact with the electrical element 20 when the electrical element 20 is housed in the housing portion 13.

With this structure, the protruding surfaces 161 and 163 function as guides when mounting the electrical element 20. When the electrical element 20 is attached to the base plate 10 by the fixing device 40, the protruding surfaces 161 and 163 do not come into contact with the electrical element 20. This configuration allows the wiring substrate 1 to be constructed with minimal stress applied to the electrical element 20.

The embodiments and variations have been described above. However, the embodiments and variations are not limited to the examples described above. For example, multiple embodiments and variations may be implemented in combination with each other.

1 Cable routing substrate 10 Base plate 11 First surface 12 Second surface 13 Housing section 14 Mounting hole 15 Bottom surface 16, 16A, 16B Side surface 16a First projection 16b Second projection 161, 163 Projection surface 17 Fixing section 17a First fixing section 17b Second fixing section 18 Fixing surface 18a First fixing surface 18b Second fixing surface 20 Electrical element 21 Electrical element body 21a First end 21b Second end 22 Connection section 22a First connection section 22b Second connection section 23 First member 23a One side first member 23b Other side first member 24 Second member 24a One side second member 24b Other side second member 30 Bus bar 31 First bus bar 32 Second bus bar 40 Fixing device 41 Shaft section 42 Head 50 Cover section 51 Intermediate plate 52 Main cover 53 Opposing surface

Claims (5)

An insulating base plate,
The electrical element held on the base plate,
A fixing device for connecting the base plate and the electrical element,
Equipped with,
The aforementioned base plate is
The first surface on which the electrical elements and the fixing device are arranged,
A second surface facing the opposite side of the first surface,
A housing portion formed on the first surface and housing at least a part of the electrical element,
Equipped with,
The aforementioned electrical element is
An electrical element body is formed in a columnar shape with an axis as its center, extending in the axial direction of the axis, and housed in the housing portion.
A connection portion that is connected to the main body of the electrical element and connected to the base plate by the fixing device,
It has,
The aforementioned housing section is
In the first direction, which is the direction intersecting the first surface, there is a recess extending from the first surface toward the second surface, and a mounting hole in which the electrical element body is housed,
A fixing part to which the fixing device is fixed so as to connect the aforementioned connecting part,
It has,
The fixing portion has a fixing surface that is aligned with the first surface,
The fixed surface is positioned in the first direction at a location farther from the second surface than the electrical element body housed in the mounting hole.
Circuit board for cable routing. The mounting hole is formed along the fixing surface and has a bottom surface facing the electrical element body housed inside.
The bottom surface is positioned in the first direction, close to the second surface relative to the fixed surface.
A wiring substrate according to claim 1. The aforementioned connection part is
A first member is positioned away from the main body of the electrical element when viewed from the axial direction in which the aforementioned axis extends, and extends from the end of the main body of the electrical element in a direction intersecting the axial direction,
A second member extending in the axial direction from the end of the first member so as to be separated from the main body of the electrical element,
It has,
The fixed surface is connected to the second member by the fixing device.
A wiring substrate according to claim 1. The electrical element is further provided with a cover portion that sandwiches and covers it with the base plate in the first direction,
The aforementioned cover portion is
Having opposing surfaces facing the main body of the electrical element in the first direction,
The distance between the opposing surface and the connecting portion in the first direction is shorter than the length of the electrical element body in the first direction.
A wiring substrate according to any one of claims 1 to 3. The first busbar is held on the base plate on the first surface,
A second busbar is held in the first surface to the base plate, spaced apart from the first busbar,
Furthermore,
The first busbar and the second busbar are electrically connected to the electrical element.
The aforementioned electrical element is a fuse.
A wiring substrate according to claim 1.