JP2007059723A - Light shielding plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light shielding plate which is lightweight, firm, and simple in structure so as to protect an electronic apparatus, which is designed for outdoor use and equipped with various electronic components that constitute electronic circuits and are housed in a waterproof cabinet against direct rays of the sun. <P>SOLUTION: The light shielding plate 3 is composed of a heat insulating material 33 formed of porous expanded styrene foam and two metal plates 31 and 32 sandwiching the heat insulating material 33 between them. The light shielding plate 3 is fixed by a bolt 6 to a threaded hole 52b bored in a cylindrical spacer 52 fixed to a cabinet 51 in an electronic apparatus 5 by welding, whereby heat received by the metal plate 31 from the direct rays of the sun is shut off by the heat insulating material 33 to protect the electronic apparatus 5 against the direct rays of the sun. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a light shielding plate for protecting various electronic devices from direct sunlight, in which various electronic components constituting an electronic circuit are housed in a waterproof casing and arranged around an electronic device used outdoors.

  Usually, when an electronic device is used outdoors, it is necessary to provide a light shielding plate for protecting the electronic device from direct sunlight to reduce the influence of direct sunlight on the electronic device as much as possible. This is to prevent the electronic devices from being heated to high temperatures due to direct sunlight in the summer, and the performance of the various electronic components stored in the electronic devices is degraded, and in some cases, the various electronic components themselves are not damaged by heat. It is.

In order to satisfy such requirements, conventionally, a light shielding body has been proposed in which a metal plate and a heat insulating material capable of blocking radiant heat are arranged outside an electronic device (see, for example, Patent Document 1).
Japanese Utility Model Publication No. 7-14696

  By the way, when an electronic device containing such electronic components is attached to a ground structure such as a utility pole, it is desirable that the light shielding plate disposed outside the electronic device is as light and strong as possible. Since an electronic device containing electronic components is usually installed near the upper part of the utility pole, a heavy shading plate is inconvenient to carry and is troublesome to install. Further, if the light shielding plate is heavy, the mounting portion of the electronic device to which the light shielding plate is attached needs to have a strength that can withstand the weight of the light shielding plate. In addition, when the electronic device and the light shielding plate fall off from the utility pole due to natural phenomena such as an earthquake or a typhoon, there may be a problem that the building near the utility pole is damaged if the light shielding plate is heavy. At the same time, the light shielding plate disposed outside the electronic device attached to the utility pole is required to have sufficient durability against natural environments such as wind and rain.

  The light shielding body proposed in Patent Document 1 employs a structure comprising a metal plate provided outside the light shielding body and a heat insulating material disposed inside the metal plate. However, in Patent Document 1, when a non-metal plate such as a resin is used as the heat insulating material inside the metal plate, although it is light, there is a problem that the strength of the light shielding body is insufficient. In particular, in an attachment portion for attaching a light shielding body to a box such as an electronic device, a mounting member such as a bolt penetrates the heat insulating material, which may cause a problem in strength and durability of the heat insulating material around the bolt.

  The present invention has been made in view of these problems, and an object of the present invention is to provide a light-shielding plate that is lightweight, strong, and has a simple structure.

  In order to achieve this object, the invention according to claim 1 is characterized in that various electronic parts constituting an electronic circuit are housed in a waterproof casing and are arranged around an electronic device used outdoors. A light-shielding plate for protecting an electronic device from direct sunlight, comprising a resin heat insulating material and two metal plates sandwiching the heat insulating material.

  According to such a configuration, a high heat insulating effect can be obtained. In addition, the use of a resin heat insulating material can reduce the weight of the light shielding plate. Furthermore, since both sides of the heat insulating material are sandwiched between metal plates, sufficient strength and durability of the light shielding plate can be ensured.

  According to a second aspect of the present invention, in the light shielding plate according to the first aspect, of the two metal plates, the metal plate disposed on the electronic device side is in contact with the casing of the electronic device. A plurality of fins are provided so as to be in contact with each other and absorb heat from the casing and radiate it to the surroundings.

  According to such a configuration, the heat of the direct sunlight irradiated to the metal plate disposed on the side far from the housing is insulated by the heat insulating material, and at the same time, the heat from the housing can be radiated to the surroundings by the plurality of fins. it can. Further, the heat transmitted from the housing to the metal plate on the housing side through the fins can be radiated from the metal plate on the housing side of the light shielding plate.

  According to a third aspect of the present invention, in the light shielding plate according to the first or second aspect, the housing is formed in a rectangular box shape, and the light shielding plate is adjacent to the housing. The cross section is formed in an L shape or a U shape so that direct sunlight hitting the surface or three surfaces can be shielded.

  According to such a configuration, since the cross section is formed in an L shape or a U shape so that the light shielding plate can shield direct sunlight hitting two or three adjacent surfaces of the housing, Since there is no gap between the light shielding plates that occurs when the side surfaces are covered with separate light shielding plates, the light shielding properties of the light shielding plates can be improved. In addition, the light shielding plate having a L-shaped or U-shaped cross section has higher strength and rigidity as a whole of the light shielding plate than when the upper surface and side surfaces of the housing are covered with separate light shielding plates. Therefore, the thickness of the two metal plates constituting the light shielding plate can be reduced accordingly. Thereby, the light-shielding plate can be further reduced in weight. Furthermore, by reducing the number of light shielding plates, it is possible to reduce the number of attachment parts and attachment man-hours of the light shielding plate to the electronic device.

According to a fourth aspect of the present invention, in the light shielding plate according to any one of the first to third aspects, the resin is porous.
According to such a configuration, the polystyrene foam formed in a porous manner is generally a low-cost and relatively easily available material, so that the manufacturing cost of the light shielding plate can be kept low.

<First embodiment>
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is an exploded view illustrating an electronic device and a light shielding plate. FIG. 2 is a cross-sectional view showing the structure of the light shielding plate and the state of attachment to an electronic device.

  An electronic device 5 shown in FIG. 1 is a CATV electronic device (for example, a trunk line amplifier) that is used by being attached to a ground structure such as a utility pole, and various electronic components are disposed in a rectangular box-shaped casing 51. Is stored.

  On the rear surface (rear surface) of the casing 51 of the electronic device 5, ribs 53 and 54 for attaching the electronic device 5 to a utility pole or the like are provided. The ribs 53 and 54 have a substantially rectangular parallelepiped shape, and are provided with a plurality of screw holes 53a and 54a. The electronic device 5 can be attached to a ground structure such as a power pole by screwing a fitting (not shown) such as a U bolt attached to the power pole side into the screw holes 53a and 54a.

  In addition, a plurality of circular spacers 52 are provided on the left and right side surfaces and the upper surface of the casing 51 for attaching a light shielding plate to be described later. The spacer 52 is fixed to the electronic device 5 by arc welding.

  A threaded portion 52 b is formed on the inner circumferential surface of the spacer 52. Therefore, the light shielding plate can be attached to the electronic device 5 by screwing the bolt 6 into the threaded portion 52 b of the spacer 52. The washer 61 is for preventing the bolt 6 from loosening.

Next, the light shielding plate that covers the electronic device 5 will be described.
As shown in FIG. 1, a part of the upper surface, front surface, and rear surface of the electronic device 5 is covered with a light shielding plate 2, and the left and right side surfaces are covered with a dedicated light shielding plate 3.

  The light shielding plate 2 is configured by bending a plate into an L shape. The upper surface 2a and the front surface 2b of the light shielding plate 2 are bent at a substantially right angle by a ridge line 21, and the upper surface 2a and the rear surface 2d of the light shielding plate 2 are bent at a substantially right angle by a ridge line 22. The upper surface 2a, front surface 2b, and rear surface 2d of the light shielding plate 2 are all flat.

The light shielding plate 3 has a flat plate shape.
Next, the structure of the light shielding plate 3 shown in FIG. 2 will be described.
Although the shape of the light shielding plate 2 is different from that of the light shielding plate 3, its cross-sectional structure is the same as that of the light shielding plate 3. Therefore, the light shielding plate 3 will be described here and the description of the cross-sectional structure of the light shielding plate 2 will be omitted. To do.

  As shown in FIG. 2, the light shielding plate 3 includes a heat insulating material 33 and two metal plates 31 and 32 sandwiching the heat insulating material 33. The metal plates 31 and 32 are made of, for example, an aluminum alloy.

  The heat insulating material 33 is made of porous resin. When the heat insulating material 33 is porous, a high heat insulating effect can be obtained. Further, by using a resin for the heat insulating material 33, the light shielding plate 3 can be reduced in weight. Furthermore, since both sides of the heat insulating material 33 are sandwiched between the metal plates 31 and 32, sufficient strength and durability of the light shielding plate 3 can be ensured.

As the resin, for example, polystyrene foam is used. If it does so, since the polystyrene can generally be obtained easily and is a low-cost material, the manufacturing cost of the light-shielding plate 3 can be suppressed low.
The protective member 34 is provided to prevent the heat insulating material 33 and the metal plates 31 and 32 from peeling off at the end face of the light shielding plate 3, but the protective member 34 is not provided if sufficient durability is obtained. May be.
<Effect of the first embodiment>
The light shielding plate 2 and the light shielding plate 3 prevent the electronic device 5 from receiving direct sunlight. Furthermore, since the heat of direct sunlight received by the metal plate outside the light shielding plate is blocked by the heat insulating material and is not transmitted to the electronic device 5, the electronic device 5 can be protected from direct sunlight.

  In addition, since the shape of the light shielding plate 2 is formed in a substantially L shape so that a part of the front surface, upper surface, and rear surface of the electronic device 5 is covered with one light shielding plate, the front surface, the upper surface, and the rear surface of the electronic device 5 are covered. Compared to the case where a part is covered with a separate flat light-shielding plate, no gap is generated between the flat light-shielding plates. As a result, high light shielding performance of the light shielding plate can be obtained.

  Further, since the light shielding plate 2 is a single light shielding plate formed in a substantially L shape, the rigidity is higher than that of a flat light shielding plate that individually covers a part of the front surface, the upper surface, and the rear surface of the electronic device 5. It has. As a result, the plate thickness of the two metal plates 31 and 32 constituting the light shielding plate 2 can be reduced. Thereby, weight reduction of the light-shielding plate 2 can be achieved.

Furthermore, when performing an appearance check, maintenance inspection, etc. of the electronic device 5, there is one light shielding plate that covers a part of the front, top, and rear surfaces of the electronic device 5 and a flat light shielding plate that covers the left and right side surfaces of the electronic device 5. It is not necessary to remove both from the electronic device 5, and only the substantially L-shaped light-shielding plate can be removed from the electronic device 5 to perform maintenance and inspection work. Thereby, the maintenance inspection work of the electronic device 5 can be performed in a short time.
<Second Embodiment>
A second embodiment according to the present invention will be described with reference to FIG.

  In the second embodiment, of the two metal plates sandwiching the heat insulating material, the metal plate disposed on the electronic device side is brought into contact with the housing of the electronic device and absorbs heat from the housing to the surroundings. This is an embodiment in which a light shielding plate having a structure provided with a plurality of fins for radiating is attached to an electronic device.

  The light shielding plate 4 shown in FIG. 3 includes a heat insulating material 43, two metal plates 41 and 42 that sandwich the heat insulating material 43, and a plurality of fins 45. The heat insulating material 43 of the light shielding plate 4 and the two metal plates 41 and 42 sandwiching the heat insulating material 43 include the heat insulating material 33 of the light shielding plate 3 and the two metal plates 31 and 32 sandwiching the heat insulating material 33 shown in FIG. Since it is the same, explanation is omitted. A plurality of metal fins 45 are provided on the surface of the metal plate 42 on the housing 51 side, and the other ends of the fins 45 are in contact with the surface of the metal plate 44 attached to the electronic device 5.

  The heat insulating material 43, the metal plates 41, 42, 44 and the fins 45 of the light shielding plate 4 are formed integrally in advance and fixed to the housing 51 with bolts 6. As a specific fixing method, a nut (not shown) is attached to the inner side surface of the casing 51 in advance by, for example, welding, and the bolt 6 is screwed into the nut.

At that time, for example, a silicon resin film 46 or the like is attached to either the surface of the housing 51 that contacts the metal plate 44 or the surface of the metal plate 44 that contacts the housing 51. As a result, the thermal conductivity between the casing 51 and the metal plate 44 is further improved, so that the heat dissipation performance by the light shielding plate 4 is further improved.
<Effect of the second embodiment>
If comprised in this way, not only the heat | fever of the direct sunlight with which the metal plate 41 is irradiated like the 1st Embodiment insulate with the heat insulating material 43, but the heat | fever transmitted from the electronic device 5 simultaneously may be equipped with several fin 45 or The metal plate 42 can radiate heat to the surroundings.

  Further, when the light shielding plate 4 is configured as shown in FIG. 3, the weight is reduced by eliminating the spacer 52 and the bolts 6 for attaching the spacer 52 to the electronic device 5. Moreover, since the total number of parts combining the casing 51 and the light shielding plate 4 is also reduced, the manufacturing cost of the light shielding plate 4 can be reduced.

  As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various aspect can be taken in the range which does not deviate from the technical idea of this invention.

  For example, as a method for welding the spacer 52 to the casing 51, butt friction welding may be used in addition to the arc welding shown in FIG. Alternatively, a flange (not shown) may be provided at the end of the spacer 52 that comes into contact with the casing 51 and the flange may be fixed to the casing 51 using projection welding. When friction welding or projection welding is used, the welding time can be shortened compared to arc welding. Thereby, the influence of the thermal strain which the housing | casing 51 receives by welding can be reduced.

  Further, instead of welding and fixing the spacer 52 in FIG. 2 to the casing 51, the spacer 52 and the casing 51 may be integrally formed using, for example, an aluminum casting method. When the molding is performed integrally, welding equipment and welding man-hours for attaching the spacer 52 to the housing 51 are not required. Furthermore, it is not necessary to consider the influence of thermal strain on the casing 51 due to welding. In addition, since the number of parts of the electronic device and the light shielding plate as a whole is reduced, the number of steps for assembling the light shielding plate to the electronic device is also reduced.

  Furthermore, the spacers 52 and the ribs 53 and 54 provided in the electronic device 5 may be formed separately in advance and attached to the housing 51 with screws or the like, or may be formed integrally with the housing 51. By forming the spacer 52 and the ribs 53 and 54 integrally with the housing 51, the number of parts of the electronic device 5 can be reduced.

It is an exploded view showing an electronic device and a light shielding plate. It is sectional drawing showing the structure of a light-shielding plate, and the attachment condition to an electronic device. It is sectional drawing showing the light-shielding plate provided with the several fin.

Explanation of symbols

2 ... light shielding plate, 2a ... horizontal member, 2b, 2d ... vertical member, 3 ... light shielding plate, 3a ... through hole, 4 ... light shielding plate, 5 ... electronic device, 6 ... bolt, 21, 22 ... ridge line, 31, 32 ... Metal plate, 33 ... Heat insulating material, 34 ... Protection member, 41, 42 ... Metal plate, 43 ... Heat insulating material, 45 ... Fin, 46 ... Silicone resin film, 51 ... Housing, 52 ... Spacer, 52b ... Screw part, 53, 54 ... ribs, 53a, 54a ... screw holes, 61 ... washers

Claims (4)

Various electronic components constituting an electronic circuit are housed in a waterproof casing and arranged around an electronic device used outdoors, and is a light shielding plate for protecting the electronic device from direct sunlight,
Resin insulation,
A light shielding plate comprising two metal plates sandwiching the heat insulating material.   Of the two metal plates, a metal plate disposed on the electronic device side is in contact with a housing of the electronic device and absorbs heat from the housing to radiate it around. The light-shielding plate according to claim 1, wherein fins are provided.   The casing is formed in a rectangular box shape, and the light shielding plate has an L-shaped or U-shaped cross section so that it can block direct sunlight hitting two or three adjacent surfaces of the casing. The light shielding plate according to claim 1, wherein the light shielding plate is formed.   The light shielding plate according to any one of claims 1 to 3, wherein the resin is porous.

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