JPH0946111A - Heater for melting snow deposited on paraboloidal antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To melt snow efficiently with a simple mount mechanism by adhering a heat generating sheet consisting of a thin synthetic resin-made sheer incorporated with a heater generating element to strippable mount and making a slit to the heat generating sheet in the radiation direction. SOLUTION: A heat generating sheet 2 is formed by inserting a heat generating element 3 formed by arranging a thin strip shaped aluminum foil with a thickness of 15μm in a meandering way between polyethylenetelephthalate-made rear and front sheets with a thickness of 50μm as a sandwich and the surface of the sheet 2 is coated by a coating film. Then an adhesives agent is coated to the rear side of the heat generating sheet 2, which is adhered to a strippable mount 1. The strippable mount and the heat generating sheet 2 are formed to be nearly semi-circular and three slits 5 are punched in the radial direction. Then the heat generating sheet 2 is stripped from the strippable mount 1 and the entire face of the heat generating sheet 2 is adhered closely along with a curved face of a lower half of the front side of a paraboloidal reflecting mirror while the cur side ends of the slits 5 are kept rather open and a connecting terminal 6 led from the end of the heat generating element 3 is connected to a power supply via a plug 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a snow melting heater for removing snow accumulated on a reflecting surface of a parabolic antenna used for receiving BS or CS broadcasts and communication signals in a snowfall region or a cold region. Regarding

[0002]

2. Description of the Related Art In a snowfall region, a cold region, etc., snow adhesion is likely to cause deterioration of antenna characteristics. Therefore, conventionally, a means for attaching a heater to a key portion (including a radome) of the antenna to melt and remove snow has been attempted. The heater may be installed at, for example, the actual opening 58-
As described in JP-A-107601 and JP-A-5-14048, a portion avoiding the parabolic reflecting surface is selected, such as being provided on the back surface of the parabolic reflecting mirror. It is presumed that the reason is that when a heater was attached to the parabolic reflecting surface, a heater suitable for maintaining characteristics such as gain and cross polarization discrimination ability could not be secured.

[0003]

In a parabolic antenna, especially for satellite broadcasting reception, the reflecting surface is installed diagonally upward, and therefore a parabolic antenna for which no snow melting countermeasure is taken is exemplified in FIG. In addition, the snow S is most accumulated on the lower part of the reflecting surface of the parabolic reflector 8, which is the worst condition for maintaining the characteristics of the antenna. It can be said that a heater attached to the back surface of the reflector is effective for melting and removing the snow without affecting the reflection surface, but the conduction heat reaching the surface from the back surface of the reflector removes the snow. Since it will melt, the inefficiency cannot be denied. Also, in the past, while using a cord-shaped heater and a surface heating element,
Since there is a rib on the back of the parabolic reflector,
It was difficult to assemble so that it closely adhered to the entire curved surface of the reflecting mirror, and it was impossible to provide a product that could be easily attached to an existing antenna by an individual at each home.

[0004]

DISCLOSURE OF THE INVENTION The present invention is a snow melting heater for a parabolic antenna, in which the heater attachment portion is set at the position where the snow melting efficiency is the highest, and the performance is not deteriorated.
The structure is such that a thin resin sheet with an adhesive applied to the back surface is integrally provided with a heating element and attached to a release mount, and at least the resin sheet is formed with a radial slit or a cutting instruction line is clearly indicated. There is something I did. A thin strip-shaped metal foil is preferably used as the heating element.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A snow melting heater for a parabolic antenna according to the present invention will be described with reference to the drawings. FIG. 1 shows an example of a snow melting heater. Reference numeral 1 is a release mount, 2 is a heat generating sheet, and the heat generating sheet 2 is a PET (polyethylene terephthalate) back with a thickness of 50 μ as illustrated in FIG. A heating element 3 formed by arranging a thin strip-shaped aluminum foil with a thickness of 15 μ in a meandering shape between a sheet 2 a and a PET surface sheet 2 b having the same thickness of 50 μ is sandwiched and formed on the surface. Is coated with a coating film 4 so that the pattern of the heating elements 3 cannot be seen from the surface (see FIG. 1).
Then, the coating film is omitted and the heating element 3 is shown so as to be confirmed from the outer surface). An adhesive is applied to the back surface of the backing sheet 2b and is releasably attached to the release liner 1. The heating element 3 made of aluminum foil is formed by etching aluminum foil.

The release liner 1 and the heat generating sheet 2 are substantially semicircular, and three slits 5, 5 and 5 are formed by punching in the radial direction. The heat generating sheet 2 has a structure in which a connecting terminal 6 for power supply is led out from an end of the heat generating element 3, a plug 7 is attached to the tip thereof, and the whole is insulated.

The snow melting heater thus formed can peel off the heat generating sheet 2 from the release liner 1 and stick it to the lower half of the surface of the parabolic reflector 8 as shown in FIG. When sticking the heat-generating sheet 2, make sure to follow the curved surface,
Open the ends of the slits 5, 5, 5 on the notch side so that the entire surface is in close contact. After the application is completed, the plug 7 is fitted into the power socket 9 and electrically connected to the power supply line.

In the parabolic antenna to which the heat generating sheet is attached, the heat generating element becomes high temperature when the power is turned on during snowfall, and the snow accumulated on the reflecting surface is quickly melted and removed.
The parabolic reflector 8 to be attached is made of synthetic resin, and as shown in FIG. 4, a reflector 10 made of a grid-like wire mesh is embedded inside the reflecting surface, while the heat generating sheet 2 is used. Is extremely thin, and since the heat generating sheet 2 is in close contact with the reflecting surface, the distance between the reflector 10 and the heat generating element 3 in the reflecting mirror is only 60 to 80 μm, which causes diffuse reflection of radio waves. Therefore, there is almost no influence on the gain or the cross polarization discrimination degree. In addition, snow directly contacts the heat generating sheet,
It has good thermal efficiency, low energy loss, and does not damage the design of the parabolic reflector.

Since the heat generating sheet of the embodiment has a semicircular shape and has slits in the radial direction, it adheres to the reflecting surface over the entire surface without forming wrinkles in the lower half of the curved parabolic reflecting mirror, so Although it is possible to attach them close to each other, it is possible to clearly indicate a cutting instruction line instead of the slit, and to form a slit along the instruction line before the worker can attach the slit, The shape of the heat generating sheet is not limited to a semicircle, and it is also possible to combine multiple sheets such as fan-shaped or triangular sheets to attach in a semicircular shape.The attachment surface to the reflecting mirror surface is not limited to the lower half, You may attach it to half and cover the entire surface. A coaxial cable can be used as the power supply means.

The formation pattern of the heating elements is appropriately changed such as by forming a petal shape or dividing into a dense portion and a rough portion, and ON / OFF of the power source is automatically controlled according to the outside temperature, A means for auxiliary fixing the outer periphery of the heat generating sheet may be provided.

The heating element may be made of a metal other than aluminum, such as copper, as long as it generates heat when energized, and the form thereof is not limited to a strip shape, and an ultrafine wire may be employed. If the front sheet is made of opaque material and has the same color as the parabolic reflector, it is possible to eliminate the need for painting, and it is desirable to use a material with excellent weather resistance for painting. As the material for the sheet, synthetic resins other than PET can also be used. . Further, in the embodiment, the etching process is used as the method of forming the heat generating element, but it is also possible to print by using a metal-based conductive paint.

Since the heat generating sheet needs to be in close contact with the reflecting surface as much as possible, as shown in FIG.
In addition to the radial slits 5, 5, 5, concentric circular arc slits 11, 11, ... Are provided.
It is possible to easily fit the curved surface by absorbing the deviation from the curved surface at the 1 ... portion.

[0013]

The heating sheet is peeled off from the release liner and attached to the reflection surface, and the attachment is completed simply by connecting the power source, so that anyone can easily attach it and it is an ultra-thin sheet type. Therefore, even if it is provided on the reflecting surface, almost no irregular reflection is confirmed, and it can be said that the snow melting effect is excellent.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of a snow melting heater according to the present invention.

FIG. 2 is a partial cross-sectional explanatory view taken along the line AA in FIG.

FIG. 3 is an explanatory diagram of a parabolic reflector to which a heat generating sheet is attached.

FIG. 4 is a partial cross-sectional explanatory view taken along the line BB in FIG.

FIG. 5 is an explanatory diagram of a modification example.

FIG. 6 is an explanatory diagram showing a parabolic antenna that has not been subjected to snow damage countermeasures.

[Explanation of symbols]

1 ... Peeling mount, 2 ... heating sheet, 3 ... heating element,
4 ・ ・ Coating film, 5 ・ ・ Slit, 6 ・ ・ Connecting terminal, 7 ・ ・
Plug, 8 ... parabolic reflector, 9 ... power socket,
10 ... Reflector, 11 ... Slit, S ... Snow.

Claims (2)

[Claims] 1. A thin synthetic resin sheet having a back surface coated with a pressure sensitive adhesive is integrally provided with a heating element to form a heating sheet, and the heating sheet is attached to a release liner, and at least the heating sheet is radiated. Parabolic antenna snow melting heater with slits formed in the same direction or with a cutting line clearly indicated. 2. The snow melting heater for a parabolic antenna according to claim 1, wherein the heating element is formed of a thin strip-shaped metal foil.