FI58995C - MEDICAL ANTENNA FOERSEDD FOENSTERRUTA AV LAMINATTYP FOER FORDON - Google Patents

Description

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Patent- and ragisterstyrelsan '' Aiueksn utiagd och utUkrHun pubikcnd 30.01.81 (32) (33) (31) fyydatty atuelkaMi —Begird priority 20.03.70

Federal Republic of Germany-Förbundsrepubliken Tyskland (DE) Gbm 7010329 (71) Saint-Gobain, 62 Boulevard Victor-Hugo, 92 Neuilly sur Seine,

France-France (FR) (72) Heinz Kunert, Cologne, Heinz Möbs, Herzogenrath, Gerd Sauer,

Broichweiden, Germany-Förbundsrepubliken Tyskland (DE) (7 ^) Berggren Oy Ab (5 * 0 Laminated vehicle window glass with antenna -Med antenn försedd fönsterruta av laminattyp för fordon

The invention relates to an antenna-type vehicle window glass with an antenna, in which an electrical conductor is incorporated in a plastic layer between two layers of glass and in which this electrical conductor is at least partially spaced a few centimeters from the edge of the glass mounting frame.

Various types of car window glass with a built-in antenna are known in the past (e.g. French patent 1,513-70). Thus, it is known to embed metal wires in an intermediate layer of laminated plastic material. In this case, the electrical connection of these wires forming the antenna extends beyond the edge of the glass between the two layers of glass. On the other hand, it is also known to place electrically conductive strips on the other side of the window glass of a car made of a single layer of safety glass, for example by pressing and then burning a metal mass, in which case the connecting cable is connected to the edge of the glass layer.

If the coupling is placed, as has been the custom so far, just 2 58995 close to the edge of the glass, various disadvantages occur. First, the coupling causes problems in installing the glass in its frames and its tightness. On the other hand, and this is particularly significant in this case, the performance of the antenna is more or less affected by the fact that the coupling member and part of the coupling cable are embedded directly in the windshield frame and thus very close to the car body metal frame. Measurements have shown that the significant decrease in electrical voltage at the output and a significant increase in interference is due to the proximity of the connection to the car body, as in this area the capacitance increases and the resistance to dielectric losses decreases undesirably. Moreover, under these conditions, the total capacitance of the antenna is so high that it is no longer suitable for conventional modern receivers.

The object of the invention is to eliminate the above-mentioned disadvantages, in particular with regard to the connection of the antenna, and the invention is characterized in that the electrical conductor is entirely at least a few centimeters from the glass edge, the second glass layer has an opening

The invention will now be described in more detail by way of example with reference to the accompanying drawing, in which: Figure 1 shows a plan view of a windscreen with a built-in antenna, and Figure 2 shows on a larger scale the connection point of the antenna.

In these figures, reference numeral 1 denotes a car windscreen which is laminated glass (safety laminated glass). The antenna conductors are placed in an intermediate layer of plastic material of glass 1, which connects two layers of basic glass. In the example shown, the antenna conductors consist of one conductor 2 parallel to the upper edge of the glass and located horizontally at a certain distance therefrom, and a second conductor 3 extending vertically downwards and located in the middle of the windscreen.

In principle, the antenna conductors can be of any shape and appearance. The greater the distance between the conductors and the car body, i.e. the distance between the connection point and the edge of the glass, the more favorable it is for the performance of the antenna.

Of course, the windshield of a car can be used as well as the rear window of a car as the glass in which the antenna is built-in; in general, it is more advantageous to build the antenna on the windshield, since it is then located closer to the radio receiver, thus avoiding losses due to a longer connection cable.

Figure 2 shows in more detail the structure in which the antenna conductor 3 is placed between the two layers 10 and 11 of your stains forming the laminated glass. The connecting piece 5 is placed inside the opening 12 and a plate 6 with a larger diameter is placed between the two layers of glass, which gives a good firmness to the connecting piece. This can be located about 6 cm from the edge of the glass.

By suitable treatment of the glass layer 10 around the opening 12, the edge of this opening is subjected to a compressive stress in the area 13 indicated by the shaded lines 3a.