Windowpane for vehicle and antenna

#The present invention relates to a vehicle window glass having an antenna on a conductive film provided on a glass plate, and an antenna where a slot is formed on the conductive film.

#FIG. 1 is a cross-sectional view of a vehicle laminated glass that is formed with a conductive film 3 and an intermediate film 4 being sandwiched between glass plates 1 and 2. When an antenna conductor 5 for receiving radio waves is formed on the vehicle-interior side of this laminated glass as is conventionally done, there are cases where required reception characteristics cannot sufficiently be obtained on the antenna conductor 5 because radio waves coming from the outside of the vehicle are shielded by the conductive film 3.

#To remove such a harmful effect, a window glass is known in which an antenna function is provided by using a conductive film (see, for example, Patent Documents 1, 2, 3 and 4).

#FIG. 1 is a cross-sectional view of the vehicle laminated glass that is formed with the conductive film 3 and the intermediate film 4 being sandwiched between the glass plates 1 and 2.

#FIG. 2 is an exploded view of a vehicle window glass and an antenna according to the present invention.

#FIG. 3A is a front view of a vehicle window glass 100 as a first embodiment of the present invention.

#Hereinafter, modes for carrying out the present invention will be described with reference to the drawings. The vehicle window glass according to the present invention may be a windscreen attached to a front part of a vehicle, may be a side window attached to a side part of a vehicle, or may be a rear glass attached to a rear part.

#FIG. 2 is an exploded view of the vehicle window glass and the antenna according to the present invention. The vehicle window glass shown in FIG. 2 is a laminated glass formed by laminating a glass plate 11 as a first glass plate disposed on the vehicle-exterior side and a glass plate 12 as a second glass plate disposed on the vehicle-interior side. FIG. 2 shows elements of the vehicle window glass and the antenna according to the present invention so as to be separated in the direction of the normal to the plane of the glass plate 11 (or the glass plate 12). The vehicle window glass of FIG. 2 has a lamination structure in which a conductive film 13 is disposed between the glass plate 11 and the glass plate 12, and a pair of electrodes 16 including an electrode 16A and an electrode 16B are disposed on the side opposite to the position of disposition of the conductive film 13 with the glass plate 12 in between. A slot 23 is formed on the conductive film 13. The slot 23 is in contact with the upper edge 13a of the conductive film 13. That is, the slot 23 has one end thereof opened at the upper edge 13a which is the outer peripheral edge of the conductive film 13. The glass plate 11, the conductive film 13 where the slot 23 is formed, the glass plate 12 and the pair of electrodes 16 are laminated in this order to form an antenna. The conductive film 13 is disposed in the form of a layer between the glass plate 11 and the glass plate 12, and the glass plate 12 is disposed in the form of a layer between the conductive film 13 and the electrodes 16.

#As described above, since an antenna can be formed of a conductive film, a slot formed on the conductive film and a pair of electrodes, it can be resonated at a predetermined frequency irrespective of the slot between the vehicle body flange and the conductive film.