JP2021040272A - Antenna and wireless communication device - Google Patents

Abstract

To provide an antenna which enables easy connection work between the antenna and a heat radiation component and effectively radiates heat from the heat radiation component at an interior of the housing from an antenna rod at the exterior of the housing while using the antenna rod made of a resin.SOLUTION: An antenna wire 10 is provided at a wireless device. A metal heat radiation member 21 is directly fixed to a heat radiation component 40, in which a base end is provided at an interior of a housing 60 of a wireless communication device, and protrudes to an exterior of the housing 60 at its tip, and the antenna wire 10 is inserted thereinto. Projections 213 are provided on a surface of the metal heat radiation member 21. A heat radiation resin member 22 is provided at the exterior of the housing 60 and covers an outer periphery of the metal heat radiation member 21 while adhering to the projections 213. An antenna rod part 30 made of a heat radiation resin covers the antenna wire 10 protruding from the tip of the metal heat radiation member 21 and is connected to the tip of the metal heat radiation member 21.SELECTED DRAWING: Figure 1

Description

The present invention relates to an antenna and a wireless communication device including the antenna.

Various electronic components that generate heat are built in the wireless communication device, but since these electronic components are usually housed in a resin housing with low thermal conductivity, it is difficult to dissipate heat, so the device is used. Occasionally, the temperature inside the housing becomes high, which may impair the functions of electronic components. Therefore, in wireless communication equipment, it is required to effectively dissipate heat generated inside the housing. For example, in the invention of Patent Document 1, heat is dissipated from an antenna connected to a heat generating component. In particular, since the antenna is exposed to the outside of the housing, effective heat dissipation is possible without being blocked by the housing, and the extended antenna increases the contact area with the outside air, so that the heat dissipation efficiency Has the advantage of improving.

Japanese Unexamined Patent Publication No. 2013-214868

However, in the invention of Patent Document 1, a plate-shaped heat conductive member made of an insulator is arranged between the heat generating component and the metal antenna, and the metal portion of the antenna having excellent heat conductivity directly generates heat. Since it is not connected to the component, there is a drawback that the thermal conductivity between the heat generating component and the antenna is inferior. In addition, since the metal antenna and the heat generating parts cannot be directly connected, extra parts and man-hours are required for the connection work between the two. In particular, recently, metal antenna rods have been used as antennas that are exposed to the outside of the housing due to reasons such as reduction of manufacturing man-hours, weight reduction of materials, and design requirements to make it common with resin housings. There is a demand for antenna rods made of resin.

An object of the present invention is to solve such a problem of the prior art, and while using a resin antenna rod, the antenna and the heat radiating component are connected because they do not go through an insulating heat conductive member. It is an object of the present invention to provide an antenna that is easy to work with and can effectively dissipate heat from heat-dissipating components inside the housing from an antenna rod outside the housing.

The antenna of the present invention has the following configuration.
(1) Antenna wire provided in wireless communication equipment.
(2) Metal heat dissipation in which the base end is directly fixed to a heat radiating component provided inside the housing of the wireless communication device, the tip protrudes to the outside of the housing, and the antenna wire is inserted inside. Element.
(3) A plurality of protrusions provided on the surface of the metal heat radiating member.
(4) A heat-dissipating resin member provided on the outside of the housing and covering the outer periphery of the metal heat-dissipating member in a state of being in close contact with the plurality of protrusions.
(5) A heat-dissipating resin antenna rod portion that covers the antenna wire protruding from the tip of the metal heat-dissipating member and is connected to the tip of the metal heat-dissipating member.

The antenna of the present invention may further have the following configuration.
(1) The metal heat-dissipating member is die-cast aluminum and is resin-molded inside the heat-dissipating resin member.
(2) The metal heat radiating member is composed of a linear or L-shaped bent cylindrical member, and the plurality of protrusions are predetermined on the outer periphery of the metal heat radiating member in a direction orthogonal to the axial direction thereof. It is formed in a ring shape at intervals.
A wireless communication device provided with this antenna is also an aspect of the present invention.

In the antenna of the present invention, since the metal heat-dissipating member is directly fixed to the heat-dissipating component inside the housing, the thermal conductivity between the heat-dissipating component and the antenna is improved, and the heat-conducting member is not required inside the housing. , The number of parts and assembly man-hours can be reduced. Further, by providing a plurality of protrusions on the metal heat radiating member to increase the contact area of the metal heat radiating member with the heat radiating resin member, the thermal conductivity from the metal heat radiating member to the heat radiating resin member is also improved. It is possible to quickly transfer heat from the metal heat-dissipating member toward the antenna rod formed of the heat-dissipating resin. As a result, the heat inside the housing is effectively dissipated, and it is possible to prevent the heat dissipation parts such as electronic parts inside the housing from becoming hot.

The figure which shows the structure of the antenna which concerns on embodiment. (A) shows the whole, and (b) shows only the antenna wire inserted through the antenna. The figure which shows the structure of the antenna base which concerns on embodiment. (A) shows a metal heat-dissipating member coated with a heat-dissipating resin, and (b) shows a metal heat-dissipating member before being coated with a heat-dissipating resin. The figure which shows the state which connected the antenna which concerns on embodiment to the housing of a wireless communication device. The figure which shows the structure of the antenna rod part which concerns on embodiment.

[Constitution]
Hereinafter, embodiments of the present invention will be specifically described with reference to FIGS. 1 to 4. As shown in FIG. 1A, the antenna 1 includes an antenna wire 10, an antenna base 20, and an antenna rod 30.

The antenna wire 10 is a lead wire for a wireless communication device including the antenna 1 to transmit and receive a carrier wave. The base end of the antenna wire 10 is connected to a transmission / reception unit (not shown) of the wireless communication device via an antenna terminal provided inside the wireless communication device. As shown in FIG. 1A, the antenna wire 10 is inserted into the antenna base 20 and the antenna rod 30 in this order from the side connected to the wireless communication device. In the present embodiment, since the antenna base 20 is bent by approximately 90 °, as shown in FIG. 1 (b), the antenna wire 10 of the present embodiment is refracted by approximately 90 ° correspondingly. .. The tip of the antenna wire 10 reaches the vicinity of the tip of the antenna rod portion 30 and is covered by the tip of the antenna rod portion 30.

As shown in FIG. 2A, the antenna base 20 has a substantially L-shaped tube shape in which a part of the outer periphery of the metal heat radiating member 21 is covered with the heat radiating resin member 22. In the present embodiment, a part of the outer circumference of the metal heat radiating member 21 is molded and coated on the heat radiating resin member 22 by resin molding. On the other hand, the tip of the antenna base 20, that is, the end opposite to the side connected to the wireless communication device, is connected to the antenna rod portion 30 by fitting.

The metal heat radiating member 21 is, for example, made of die-cast aluminum having excellent heat radiating properties. As shown in FIG. 2B, the metal heat radiating member 21 is a member having a substantially L-shaped tube shape, and a through hole 211 penetrating from the base end to the tip of the metal heat radiating member 21 is formed inside the metal heat radiating member 21. It is provided. The metal heat radiating member 21 has an exposed portion 212 which is not molded-coated on the heat radiating resin member 22 on the base end side thereof, that is, the side connected to the wireless communication device. As will be described later, the exposed portion 212 is inserted inside the wireless communication device and directly connected to the heat radiating component 40 provided inside the housing 60 by means such as screwing. A plurality of protrusions 213 formed in a ring shape at predetermined intervals in a direction orthogonal to the axial direction are provided on the outer periphery of the metal heat radiating member 21. It is desirable that the predetermined interval is such that the heat-dissipating resin member 22 smoothly enters between the plurality of protrusions 213 during resin molding.

As shown in FIG. 3, the exposed portion 212 of the metal heat radiating member 21 is connected to the heat radiating component 40 provided inside the housing 60 of the wireless communication device. Examples of the heat-dissipating component 40 include heat-generating components such as semiconductors and transformers, heat-dissipating fins and heat-dissipating plates connected to the heat-generating components, a substrate on which the heat-generating components are mounted, and a support member for reinforcing the strength of the housing 60. Be done. The heat radiating component 40 is connected to the exposed portion 212 by a screw 50 in a state of being in close contact with the exposed portion 212 so that heat conduction is effectively performed.

Examples of the heat-dissipating resin member 22 include silicone resin, urethane resin, epoxy resin, and acrylic resin having high thermal conductivity. It is desirable that the viscosity of the heat-dissipating resin member 22 is low enough to fit between the plurality of protrusions 213 of the metal heat-dissipating member 21 during molding. The heat-dissipating resin member 22 is provided outside the housing 60.

As shown in FIG. 4, the antenna rod portion 30 is a tubular heat-dissipating resin member that covers the antenna wire 10 exposed from the tip of the antenna base portion 20, and the insertion hole 31 of the antenna wire 10 is provided inside the base end. Is provided with an opening 32 for inserting the antenna wire 10. The base end of the antenna rod portion 30 is connected to the tip end of the antenna base portion 20 by fitting. Although the antenna rod portion 30 is formed separately from the heat-dissipating resin member 22, it may be integrally formed. Further, the antenna rod portion 30 may use the same resin as the heat-dissipating resin member 22, or may use a different resin.

[Antenna assembly process]
As a premise of obtaining the antenna 1 of the present embodiment, the metal heat-dissipating member 21 is resin-molded inside the heat-dissipating resin member 22 to manufacture an antenna base 20 in which both are integrated. In this case, since a plurality of protrusions 213 are formed in a ring shape on the outer periphery of the metal heat-dissipating member 21 in a direction orthogonal to the axial direction thereof, the metal heat-dissipating member 21 molded by resin molding and the heat-dissipating resin The member 22 meshes with the plurality of protrusions 213 to prevent the member 22 from falling off. To assemble the antenna 1, first, the antenna wire 10 is inserted into the through hole 211 from the base end of the antenna base portion 20 and protrudes from the tip end of the antenna base portion 20. Next, the antenna wire 10 protruding from the tip of the antenna base 20 is inserted into the opening 32 of the antenna rod portion 30, and the antenna wire 10 is inserted into the insertion hole 31 until the tip of the antenna wire 10 reaches the vicinity of the tip of the antenna rod portion 30. , The base end of the antenna rod portion 30 is connected to the tip end of the antenna base portion 20 by fitting.

[Connection with wireless communication device]
In order to connect the antenna 1 and the wireless communication device, as shown in FIG. 3, the exposed portion 212 of the metal heat dissipation member 21 is connected to the heat dissipation component 40 provided inside the housing 60 of the wireless communication device by a screw 50. To do. Further, the antenna wire 10 protruding from one end of the antenna base 20 is connected to the transmission / reception unit via an antenna terminal (not shown). As described above, the connection between the antenna 1 and the wireless communication device is completed.

[Action effect]
(1) In the antenna 1 of the embodiment, since the metal heat radiating member 21 provided on the antenna base 20 is directly connected to the heat radiating component 40 inside the housing 60 by means such as screwing, the antenna 1 and the heat radiating component A heat conductive member is not required between the antenna 1 and the heat radiating component 40, the heat conduction performance between the antenna 1 and the heat radiating component 40 can be improved, and the number of components can be reduced to save labor in assembling.

(2) The antenna 1 of the embodiment is provided with a plurality of protrusions 213 on the surface thereof, a metal heat radiating member 21 through which the antenna wire 10 is inserted from the base end, and a heat radiating resin member covering the outer periphery of the metal heat radiating member 21. 22 is provided. Therefore, the plurality of protrusions 213 increase the surface area of the metal heat radiating member 21 and act as heat radiating fins, so that the heat generated inside the wireless communication device can be effectively radiated from the antenna base 20. Further, since the heat-dissipating resin member 22 molds the metal heat-dissipating member 21, there is no possibility that the user directly touches the hot metal heat-dissipating member 21.

(3) Since the antenna rod portion 30 of the embodiment is made of a heat-dissipating resin connected to the heat-dissipating resin member 22, heat that has spread to the tip of the antenna wire 10 without being completely dissipated from the antenna base 20 and the antenna base The heat transferred from the coupling portion with 20 can also be effectively dissipated from the antenna rod portion 30.

(4) The metal heat-dissipating member 21 of the embodiment is aluminum die-cast and is resin-molded inside the heat-dissipating resin member 22. Since the aluminum die-cast has high thermal conductivity, the heat dissipation effect from the plurality of protrusions 213 provided on the metal heat dissipation member 21 is further strengthened. Further, since the heat-dissipating resin member 22 sufficiently enters between the plurality of protrusions 213 of the metal heat-dissipating member 21 by the resin molding, the possibility of accumulating heat in the gap between the two is reduced.

(5) Since the plurality of protrusions 213 provided on the surface of the metal heat radiating member 21 of the embodiment are formed in a ring shape in a direction orthogonal to the axial direction, they are anchors when molding with the heat radiating resin member 22. Functions as. That is, it is possible to reduce the possibility that the heat-dissipating resin member 22 will fall off from the metal heat-dissipating member 21.

[Other Embodiments]
The present invention is not limited to the above-described embodiment, and at the implementation stage, the components can be modified and embodied within a range that does not deviate from the gist thereof. In addition, various inventions can be formed by an appropriate combination of the plurality of components disclosed in the above-described embodiment. For example, some components may be removed from all the components shown in the embodiments. Specifically, it also includes other embodiments such as the following.

(1) The metal heat radiating member 21 of the embodiment has a substantially L-shaped tube shape, but the present invention is not limited to this. Any shape may be used as long as the antenna wire 10 can be inserted therein. For example, when the antenna is mounted vertically on the upper surface of the housing 60 of the wireless communication device, it is formed linearly. It may have a cylindrical shape. The plurality of protrusions 213 provided on the surface of the metal heat radiating member 21 are not limited to the circumferential direction of the metal heat radiating member 21, and may be provided in any direction as long as they function as heat radiating fins.

(2) The metal heat radiating member 21 of the embodiment may be configured such that the exposed portion 212 and the portion covered by the heat radiating resin member 22 are separate bodies, and may be connected by, for example, a set screw. In that case, heat transfer grease for improving thermal conductivity may be applied to the contact points between the two.

(3) The antenna base 20 and the antenna rod 30 of the embodiment are connected by fitting, but they may be fixed to each other by providing screw grooves, or they may be fixed by an adhesive, press-fitting or other means. May be good. In short, the structure may be such that the heat-dissipating resin of the antenna base 20 and the antenna rod 30 are closely connected and the effective thermal conductivity between the two is ensured. For example, by increasing the contact area between the antenna base 20 and the antenna rod 30, the heat transferred from the contact point with the antenna base 20 can be effectively dissipated.

(4) The exposed portion 212 and the heat radiating component 40 of the embodiment are connected by a screw 50, but if it is not necessary to replace the antenna, they may be directly welded by brazing or the like. Since the contact area between the heat radiating component 40 and the exposed portion 212 is increased by welding, heat conduction from the heat radiating component 40 to the exposed portion 212 is promoted.

1 ... Antenna 10 ... Antenna wire 20 ... Antenna base 21 ... Metal heat dissipation member 211 ... Through hole 212 ... Exposed part 213 ... Projection 22 ... Heat dissipation resin member 30 ... Antenna rod part 31 ... Insertion hole 32 ... Opening 40 ... Heat dissipation component 50 ... Screw 60 ... Housing

Claims (4)

Antenna wire provided in wireless communication equipment and
A metal heat-dissipating member whose base end is directly fixed to a heat-dissipating component provided inside the housing of the wireless communication device, whose tip protrudes to the outside of the housing, and whose antenna wire is inserted inside.
A plurality of protrusions provided on the surface of the metal heat radiating member,
A heat-dissipating resin member provided on the outside of the housing and covering the outer periphery of the metal heat-dissipating member in a state of being in close contact with the plurality of protrusions.
An antenna rod portion made of a heat-dissipating resin that covers the antenna wire protruding from the tip of the metal heat-dissipating member and is connected to the tip of the metal heat-dissipating member.
Antenna with. The metal heat-dissipating member is die-cast aluminum and is resin-molded inside the heat-dissipating resin member.
The antenna according to claim 1. The metal heat radiating member is composed of a linear or L-shaped bent cylindrical member.
The plurality of protrusions are formed in a ring shape on the outer periphery of the metal heat radiating member at predetermined intervals in a direction orthogonal to the axial direction thereof.
The antenna according to claim 1 or 2. A wireless communication device including the antenna according to any one of claims 1 to 3.