JP4627255B2 - Antenna sheet - Google Patents

Description

  The present invention relates to an antenna sheet capable of attaching an antenna element to a window glass of a vehicle or the like.

  A vehicle is generally equipped with an AM / FM radio, and is further equipped with various communication systems such as a television receiver and a wireless device. When such a communication system is equipped, the vehicle needs to be equipped with an antenna suitable for the apparatus. And as an antenna attached to a vehicle, an antenna attached to a trunk lid or a roof is known. A roof antenna to be attached to a roof is an antenna suitable for a vehicle-mounted antenna because the antenna is located at a high place and the roof can be used as a ground plane. However, the antenna attached to the vehicle body protrudes from the vehicle body. Therefore, a film antenna that is attached to a window glass of a vehicle is used as an antenna that does not protrude from the vehicle body.

The structure of the film antenna pasted on the glass part of the conventional vehicle will be described below by explaining its creation process.
FIG. 10 is a diagram showing a process for producing the film antenna 100. First, as shown in FIG. 10A, an adhesive layer 111 is formed on the back surface of the transparent film sheet 112 by printing, and this adhesive layer 111 is protected. The release sheet 110 to be adhered is adhered to the adhesive layer 111. Next, as shown in FIG. 10B, a conductive paste layer 113 having an antenna pattern shape is formed by printing a silver paste or the like on the surface of the film sheet 112. Further, as shown in FIG. 10C, a clear coating layer 114 is formed on the entire surface of the conductive paste layer 113 and a part of the surface of the film sheet 112 by printing. The clear coating layer 114 prevents the conductive paste layer 113 from being oxidized. Thereby, the film antenna 100 is created.

FIG. 11 is a perspective view showing an example of the configuration of the film antenna 100 created by the production method of FIGS. 10A to 10C, and FIG. 12 is a sectional view showing the configuration of the antenna element 101 in the film antenna 100. Shown in
The film antenna 100 shown in these drawings includes a rectangular film sheet 112, and a feeding portion 102a that is a connection portion with a coaxial cable is formed in a lower portion on the left side. The antenna element 101 is extended from the power supply unit 102a, and a U-shaped element bent along the outer shape of the film sheet 112, a vertical element extended from the power supply unit 102a, and a U-shaped element The antenna element 101 is composed of an element extending downward from the horizontal portion. The antenna element 101 is formed by a conductive paste layer 113. An adhesive layer 111 is formed on the back surface of the film sheet 112 on which the antenna element 101 is formed, and the release sheet 110 is in close contact with the entire surface of the adhesive layer 111.

  In order to attach such a film antenna 100 to a glass part of a vehicle or the like, the release sheet 110 that is in close contact with the adhesive layer 111 in the film antenna 100 is peeled from the film antenna 100. In this case, the protective sheet 115 which is in close contact with the antenna element 101 so as to protect the power feeding portion 102a which is a connection portion with the coaxial cable is also peeled off. The protective sheet 115 is provided in order to prevent the feed portion 102a from being oxidized because the feed portion 102a is exposed without being provided with the clear coating layer 114 for connecting the coaxial cable. Is provided. Thus, while peeling the peeling sheet 110 in the back surface of the film antenna 100, the film antenna 100 is stuck to glass parts, such as a vehicle, in the state which peeled the protective sheet 115 of the surface.

FIG. 13 shows a perspective view of the state in which the film antenna 100 is adhered, and FIG. 14 shows a cross-sectional view of the antenna element 101 in the configuration.
As shown in these drawings, the film antenna 100 is stuck on a glass portion 120 of a vehicle or the like. When the film antenna 100 is pasted on the surface of the glass part 120, it is easy to remove bubbles that have entered between the adhesive layer 111 formed on the entire surface of the film sheet 112 having a large area and the glass part 120. As described above, water is applied to the surface of the glass part 120 in advance and then pasted. Then, the water between the adhesive layer 111 and the glass part 120 is discharged from the edge of the film sheet 112 by rubbing the surface of the film antenna 100 toward the edge, so that the film antenna 100 adheres to the glass part 120. It is stuck to do.
JP 2003-163524 A

  In the conventional film antenna 100, even when the film sheet 112 is transparent, when the film sheet 112 is attached to the glass portion 120, the outer shape of the film sheet 112 can be visually recognized, and the film sheet 112 having a large area is attached. The visibility of the area | region in the glass part 120 will worsen. In addition, when the film antenna 100 is attached to the glass portion 120, since water is sprayed on the surface of the glass portion 120, the electronic device such as a car, a car navigation system, or a radio does not get wet. It is necessary to protect with a vinyl sheet. Furthermore, it is necessary to temporarily suspend the work until the surfaces of the film sheet 112 and the glass part 120 are dried and the film antenna 100 is in close contact with the glass part 120, and there is a problem that the workability of the attachment is poor. Furthermore, since the film antenna 100 may be affixed to a position that enters the driver's field of view, and the film sheet 112 is required to have high transparency, among the component configurations of the film antenna 100, a film having high transparency. There has been a problem that the sheet 112 increases the cost.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an antenna sheet that does not obstruct the driver's field of view, can improve the attaching workability of the antenna, and can be reduced in cost.

  In order to achieve the above object, in the antenna sheet of the present invention, the conductive paste layer that functions as an antenna element is formed between the clear coating layer and the adhesive layer, and is peeled off to the clear coating layer and the adhesive layer, respectively. The main feature is that the sheets are in close contact.

  According to the present invention, the conductive paste layer that functions as an antenna element is formed between the clear coating layer and the adhesive layer, and the release sheet is adhered to the clear coating layer and the adhesive layer, respectively. A highly transparent film sheet can be dispensed with. Also, an antenna element comprising a clear coating layer, an adhesive layer, and a conductive paste layer formed therebetween, by peeling off the release sheet, sticking the adhesive layer on the mounting surface, and further peeling off the remaining release sheet Is transferred to the mounting surface. For this reason, it becomes difficult to obstruct a driver | operator's visual field, and the workability | operativity which sticks an antenna can be improved. Furthermore, since a highly transparent film sheet is not required, the cost can be reduced.

FIG. 1 is a perspective view showing the configuration of the antenna sheet according to the embodiment of the present invention. 2 is a cross-sectional view of the antenna element portion in the antenna sheet shown in FIG.
An antenna element 2 is formed on the antenna sheet 1 shown in these drawings, and only the antenna element 2 can be attached to a window glass of a vehicle or the like. A rectangular first release sheet 10 is in close contact with the upper surface of the antenna sheet 1, and a second release sheet 11 having substantially the same shape as the first release sheet 10 is in close contact with the lower surface. The feeding portion 2a, which is the starting end of the antenna element 2, is located at the lower part on the left side of the rectangular first release sheet 10 and the second release sheet 11, and is a connection portion with the coaxial cable. The antenna element 2 extended from the power feeding part 2a includes a U-shaped element bent along the outer shape of the first release sheet 10 and the second release sheet 11, and a vertical element extended from the power supply part 2a. And an element that extends downward from the horizontal portion of the U-shaped element.

  A sectional view of a portion of the antenna element 2 is shown in FIG. 2, and a transparent clear coating layer 12 is formed under the first release sheet 10 as shown in this figure. A conductive paste layer 13 is formed by printing under the clear coating layer 12. Further, the antenna element 2 is configured by forming a transparent adhesive layer 14 under the conductive paste layer 13. The second release sheet 11 is adhered to the adhesive layer 14 to prevent dust and the like from adhering to the adhesive layer 14. The rectangular first release sheet 10 and the second release sheet 11 are slightly larger than the outer shape of the antenna element 2 and have a size that can completely cover the antenna element 2.

A method of sticking the antenna element 2 in the antenna sheet 1 to a glass part of a vehicle or the like will be described below.
First, the second release sheet 11 that is in close contact with the lower surface of the antenna sheet 1 shown in FIGS. 1 and 2 is peeled from the antenna sheet 1. In this state, since the adhesive layer 14 is exposed on the lower surface of the antenna sheet 1, the antenna sheet 1 is placed on the mounting position with the adhesive layer 14 facing down on the glass portion 20 of a vehicle or the like. The release sheet 10 is attached by lightly rubbing from the top. In this case, the line width of the antenna element 2 made of the conductive paste layer 13 is about 0.1 to 1 mm, and the width of the clear coating layer 12 is the same as the line width of the antenna element 2 or about 0.1 to 1 mm. It is about wide. Thus, since the width of the clear coating layer 12 is wide, it is a thin width of about 2 mm, so that air bubbles are formed between the adhesive layer 14 and the glass portion 20 which are substantially the same width as the clear coating layer 12. The operation of spraying water on the surface of the glass part 20 in advance can be made unnecessary. FIG. 3 shows a state in which the antenna sheet 1 from which the second release sheet 11 has been peeled is attached to the glass portion 20, and FIG. 4 shows a cross-sectional view of the antenna element 2 portion of the antenna sheet 1 in this state.

  3 and 4, when the first release sheet 10 covering the upper surface of the antenna sheet 1 is peeled off, the clear coating layer 12, the adhesive layer 14, and the clear coating layer 12 are formed on the glass portion 20 as shown in FIG. The antenna element 2 composed of the conductive paste layer 13 formed between the coating layer 12 and the adhesive layer 14 is transferred. In addition, since the 1st peeling sheet 10 is only closely_contact | adhered to the clear coating layer 12, when peeling the 1st peeling sheet 10, the adhesion layer 14 does not peel from the glass part 20. FIG. Thereby, it becomes possible to transfer the antenna element 2 to the glass part 20 of a vehicle or the like. FIG. 6 is a sectional view showing the configuration of the antenna element 2 in this case. As shown in this figure, a conductive paste layer 13 covered with a clear coating layer 12 is adhered to the glass portion 20 with an adhesive layer 14 on the glass portion 20, and the conductive paste layer 13 is connected to the clear coating layer 12. By being sandwiched between the adhesive layers 14, the entire surface is covered and oxidation of the conductive paste layer 13 is prevented.

In addition, in the conventional film antenna, the protective sheet which protects the electric power feeding part which connects a coaxial cable was required, However, In the antenna sheet 1 concerning this invention, the electric power feeding part 2a is also coat | covered with the 1st peeling sheet 10. FIG. Therefore, a protective sheet for covering the power feeding unit 2a can be dispensed with. Note that the clear coating layer 12 is not formed on the power feeding unit 2a, and the conductive paste layer 13 constituting the power feeding unit 2a is directly formed on the first release sheet 10 by printing.
As described above, when the antenna element 2 is attached to the glass portion 20 using the antenna sheet 1 of the present invention, the wide area film sheet on which the antenna element 2 is formed is not attached to the glass portion 20 and is widely used. However, since only the antenna element 2 having a width of about 2 mm is transferred to the glass portion 20, the driver's field of view is not hindered as much as possible. Further, since the width of the antenna element 2 is narrow, it can be transferred simply by rubbing lightly, and the operation of spraying water can be made unnecessary, so that the antenna element 2 can be attached easily. Furthermore, the first release sheet 10 and the second release sheet 11 do not need to be transparent, and even if transparent, it is not necessary to increase the transparency, so that the cost of the antenna sheet 1 can be reduced.

Next, an outline of a process for producing the antenna sheet 1 of the present invention will be described with reference to FIGS.
First, as shown in FIG. 7A, the clear coating layer 12 is formed by printing ink made of a transparent clear coating material on the first release sheet 10 so as to have the shape of an antenna pattern. As described above, the width of the clear coating layer 12 is printed so as to be the same as the line width of the antenna element 2 or about 0.1 to 1 mm wider. In a state where the clear coating layer 12 is dried and in close contact with the first release sheet 10, as shown in FIG. 7B, a silver paste or the like is printed on the clear coating layer 12 so as to form an antenna pattern. The conductive paste layer 13 is formed. The width of the conductive paste layer 13 is slightly smaller than the width of the clear coating layer 12 as shown in the figure. When the conductive paste layer 13 is dried, a transparent adhesive layer 14 is formed on the conductive paste layer 13 and the clear coating layer 12 on both sides thereof by printing a paste as shown in FIG. 7C. Are formed in the shape of an antenna pattern. Then, as shown in FIG. 7 (d), a second release sheet 11 having substantially the same shape as the first release sheet 10 is adhered to the entire surface of the adhesive layer 14. Thereby, the antenna sheet 1 is created. The thicknesses of the clear coating layer 12, the conductive paste layer 13, and the adhesive layer 14 are each about 20 microns, and the thickness constituting the antenna element 2 from the adhesive layer 14 to the clear coating layer 12 is as follows. The thickness is extremely thin, about 60 microns. For this reason, even if the antenna element 2 is stuck to the glass part 20, it hardly protrudes from the surface of the glass part 20, and the antenna element 2 does not get in the way when the glass part 20 is cleaned.

  The first release sheet 10 and the second release sheet 11 are processed so as to be easily peeled by performing silicon treatment or the like on paper or PET (polyethylene terephthalate). For this reason, if it prints on the peeling surface of the 1st peeling sheet 10, it will come off the clear coating material used as an ink. Therefore, when the first release sheet 10 is siliconized, the clear coating material is mixed with silicon as an additive to improve the compatibility between the release surface of the first release sheet 10 and the clear coating material, and release. The contact condition when printing on the surface is improved. As a result, the clear coating layer 12 can be formed in close contact with the first release sheet 10. However, since the clear coating layer 12 is only in close contact with the first release sheet 10 and is not attached, the first release sheet 10 can be easily peeled off from the clear coating layer 12.

  In the antenna sheet 1 of the present invention described above, the clear coating layer 12 and the first release sheet 10 are in close contact, and the adhesive layer 14 and the second release sheet 11 are in close contact. Then, since the antenna pattern of the antenna element 2 has a simple shape and is about 2 mm even if the width is wide, the first release sheet 10 and the contact area are small and the adhesion is weak. There was a possibility that the second release sheet 11 would be displaced from the antenna sheet 1. FIG. 8 shows another embodiment of the antenna sheet of the present invention that can solve this problem. FIG. 8 is a cross-sectional view of a portion of the antenna element 4 in the antenna sheet 3 which is another embodiment of the present invention.

  In the antenna sheet 3 according to another embodiment of the present invention shown in FIG. 8, a weak adhesive material is printed on one surface of the first release sheet 30 to form a first adhesive layer 32 on the entire surface. A transparent clear coating layer 33 is formed on the first adhesive layer 32 by printing in the shape of an antenna pattern. A conductive paste layer 34 is printed on the clear coating layer 33 in the shape of an antenna pattern. The conductive paste layer 34 is narrower than the width of the clear coating layer 33 and is formed at substantially the center thereof. On the conductive paste layer 34, the second adhesive layer 35 is formed by printing with the same width as the clear coating layer 33 so as to cover the entire surface of the conductive paste layer 34, and the antenna element 4 is configured. . The second release sheet 31 is in close contact with the second adhesive layer 35, and the second release sheet 31 is in close contact with the first adhesive layer 32 formed on the first release sheet 30 on both sides of the antenna element 4. Thus, the antenna sheet 3 is configured. As a result, the first release sheet 30 and the second release sheet 31 of the antenna sheet 3 come into close contact with each other, thereby preventing the first release sheet 30 and the second release sheet 31 from being displaced from the antenna sheet 3. be able to. In this embodiment, the conductive paste layer 34 is sandwiched and protected between the clear coating layer 33 and the second adhesive layer 35 to prevent the conductive paste layer 34 from being oxidized.

  In order to attach the antenna element 4 to the glass part 20 using the antenna sheet 3 according to another embodiment of the present invention described above, the second release sheet 31 is peeled off and the antenna sheet 3 is attached to the glass part 20 in the second state. The adhesive layer 35 is placed with the adhesive layer 35 facing down, and is adhered by lightly rubbing from the top of the first release sheet 30. Then, the first release sheet 30 on which the first adhesive layer 32 is formed is peeled from the clear coating layer 33 together with the first adhesive layer 32. As a result, the antenna element 4 can be transferred from the antenna sheet 3 to the glass portion 20. In this case, the width of the transferred antenna element 4 is about 2 mm at most, so that the driver's field of view is not hindered as much as possible. Further, since the antenna element 4 is narrow, it can be transferred only by lightly rubbing, and the operation of spraying water can be made unnecessary, so that the antenna element 4 can be attached easily. Furthermore, the first release sheet 30 and the second release sheet 31 do not need to be transparent, and even if transparent, it is not necessary to increase the transparency, so the cost of the antenna sheet 3 can be reduced.

The thicknesses of the clear coating layer 33, the conductive paste layer 34, and the second adhesive layer 35 are about 20 microns, respectively, and constitute the antenna element 4 from the second adhesive layer 35 to the clear coating layer 33. The thickness is very thin, about 60 microns. For this reason, even if the antenna element 4 is stuck to the glass part 20, it hardly protrudes from the surface of the glass part 20, and the antenna element 4 does not get in the way when the glass part 20 is cleaned.
Furthermore, the second release sheet 31 made of paper or PET, is with the silicon process and the like have been made to facilitate the peeling, also first adhesive layer 3 2 is weakly adhesive, second release sheet 31 can be easily peeled from the first adhesive layer 32 and the second adhesive layer 35. Furthermore, since the width of the clear coating layer 33 is about 2 mm at most, the first release sheet 30 made of paper or PET can be easily peeled from the clear coating layer 33 together with the first adhesive layer 32. it can.

FIG. 9 shows still another embodiment of the antenna sheet of the present invention that can exhibit the same function as the antenna sheet 3 of another embodiment of the present invention shown in FIG. FIG. 9 is a cross-sectional view of a portion of the antenna element 6 in the antenna sheet 5 which is still another embodiment of the present invention.
In the antenna sheet 5 according to still another embodiment of the present invention shown in FIG. 9, a weak adhesive paste is printed on one surface of the first release sheet 40 to form a first adhesive layer 42 on the entire surface. A transparent first clear coating layer 43 is formed on the first adhesive layer 42 in the shape of an antenna pattern by printing. A transparent conductive paste layer 44 is printed on the first clear coating layer 43 in the shape of an antenna pattern. The conductive paste layer 44 is narrower than the width of the first clear coating layer 43 and is formed at substantially the center thereof. A transparent second clear coating layer 45 is printed on the conductive paste layer 44 so as to cover the entire surface of the conductive paste layer 44 in the shape of an antenna pattern having the same width as the first clear coating layer 43. Is formed. Furthermore, the transparent second adhesive layer 46 is formed in the shape of an antenna pattern on the second clear coating layer 45 to constitute the antenna element 6.

The degree of adhesion of the second adhesive layer 46 is made stronger than that of the first adhesive layer 42. A second release sheet 41 is in close contact with the second adhesive layer 46, and the second release sheet 41 is in close contact with the first adhesive layer 42 formed on the first release sheet 40 on both sides of the antenna element 6. Thus, the antenna sheet 5 is configured. Thereby, since the 1st peeling sheet 40 and the 2nd peeling sheet 41 come to closely_contact | adhere, the possibility that the 1st peeling sheet 40 and the 2nd peeling sheet 41 may shift | deviate from the antenna sheet 5 can be prevented.
In this embodiment, the conductive paste layer 44 is sandwiched and protected between the first clear coating layer 43 and the second clear coating layer 45 to prevent the conductive paste layer 44 from being oxidized. ing.

  In order to attach the antenna element 6 to the glass part 20 using the antenna sheet 5 of still another embodiment of the present invention described above, the second release sheet 41 is peeled off and the antenna sheet 5 is attached to the glass part 20. 2 Adhesive layer 46 is placed with the adhesive layer 46 facing down, and is adhered by lightly rubbing from the top of the first release sheet 40. Then, the first release sheet 40 on which the first adhesive layer 42 is formed is released from the first clear coating layer 43 together with the first adhesive layer 42. Thereby, the antenna element 6 can be transferred from the antenna sheet 5 to the glass portion 20. In this case, the width of the transferred antenna element 6 is about 2 mm at the maximum, so that the driver's field of view is not hindered as much as possible. Further, since the antenna element 6 is narrow, it can be transferred by lightly rubbing, and the operation of spraying water can be made unnecessary, so that the antenna element 6 can be attached easily. Furthermore, the first release sheet 40 and the second release sheet 41 do not need to be transparent, and even if transparent, it is not necessary to increase the transparency, so that the cost of the antenna sheet 5 can be reduced.

The thicknesses of the first clear coating layer 43, the conductive paste layer 44, the second clear coating layer 45, and the second adhesive layer 46 are about 20 microns, respectively. The thickness of the antenna element 6 up to the layer 43 is extremely thin, about 80 microns. For this reason, even if the antenna element 6 is stuck to the glass part 20, it hardly protrudes from the surface of the glass part 20, and the antenna element 6 does not get in the way when the glass part 20 is cleaned.
Furthermore, the second release sheet 41 made of paper or PET is subjected to silicon treatment or the like that facilitates peeling, and the first adhesive layer 42 may be weakly adhesive. Can be easily peeled off from the first adhesive layer 42 and the second adhesive layer 46. Furthermore, since the width of the first clear coating layer 43 is about 2 mm at most, the first release sheet 40 made of paper or PET can be easily removed from the first clear coating layer 43 together with the first adhesive layer 42. Can be peeled off.

  In the above description, the present invention has been described as an antenna sheet adhered to a window glass of a vehicle, but is not limited to this and can be applied to an antenna sheet adhered to a glass portion other than the vehicle.

It is a perspective view which shows the structure of the antenna sheet | seat of the Example of this invention. It is sectional drawing of the part of the antenna element in the antenna sheet | seat of the Example of this invention. It is a figure which shows the state which peeled the 1st peeling sheet of the antenna sheet of the Example of this invention, and was affixed on the glass part. It is sectional drawing of the antenna element part at the time of sticking the antenna sheet of the Example of this invention on the glass part. It is a figure which shows the state which affixed the antenna sheet of the Example of this invention on the glass part, and peeled the 2nd peeling sheet. It is sectional drawing which shows the structure of the antenna element at the time of sticking the antenna sheet of the Example of this invention on a glass part, and peeling the 2nd peeling sheet. It is a figure which shows the outline | summary of the preparation process of the antenna sheet | seat of the Example of this invention. It is sectional drawing of the part of the antenna element in the antenna sheet | seat of the other Example of this invention. It is sectional drawing of the part of the antenna element in the antenna sheet of the further another Example of this invention. It is a figure which shows the outline | summary of the creation process of the conventional film antenna. It is a perspective view which shows the structure of the conventional film antenna. It is sectional drawing of the part of the antenna element in the conventional film antenna. It is a figure which shows the state which peeled and peeled the peeling sheet of the conventional film antenna and stuck to the glass part. It is sectional drawing of the antenna element part at the time of sticking the conventional film antenna to a glass part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Antenna sheet, 2 Antenna element, 2a Feed part, 3 Antenna sheet, 4 Antenna element, 5 Antenna sheet, 6 Antenna element, 10 1st peeling sheet, 11 2nd peeling sheet, 12 Clear coating layer, 13 Conductive paste layer , 14 adhesive layer, 20 glass part, 30 first release sheet, 31 second release sheet, 32 first adhesive layer, 33 clear coating layer, 34 conductive paste layer, 35 second adhesive layer, 40 first release sheet, 41 2nd peeling sheet, 42 1st adhesion layer, 43 1st clear coating layer, 44 conductive paste layer, 45 2nd clear coating layer, 46 2nd adhesion layer, 100 film antenna, 101 antenna element, 102a electric power feeding part, 110 Release sheet, 111 Adhesive layer, 112 Film sheet, 113 conductive paste layer, 114 clear coating layer, 115 protective sheet, 120 glass part

Claims (3)

A first adhesive layer formed on the entire surface of the first release sheet;
A clear coating layer formed on the first adhesive layer;
A conductive paste layer functioning as an antenna element formed by printing on the clear coating layer;
A second adhesive layer formed on the conductive paste layer;
A second release sheet adhered to the second adhesive layer so as to protect the second adhesive layer;
The antenna sheet, wherein the first release sheet and the second release sheet are adhered to each side of the antenna element by the first adhesive layer.   In a state where the second release sheet is peeled from the first adhesive layer and the second adhesive layer, the second adhesive layer and the clear coating layer are bonded by attaching the second adhesive layer to the attachment surface. The antenna sheet according to claim 1, wherein the antenna element including the conductive paste layer sandwiched therebetween is transferred to the attached surface. The second clear coating layer is provided on the conductive paste layer so as to protect the conductive paste layer formed by printing on the clear coating layer. Or the antenna sheet of 2 .

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