DE2030892B2 - Method for the introduction of an antenna circuit in a windshield - Google Patents

Description

The invention relates to a method for introducing an antenna circuit into a windshield according to the preamble of claim 1. Such processors are well known. So For example, it is not new (US Pat. No. 3,414,902) for a windshield designed as laminated glass embed fine copper wires in the plastic intermediate layer between the two panes of glass, which are connected to one another to form the antenna circuit. The end of the network is then led out for connection to the radio receiver. The arrangement of individual wires in the However, the intermediate layer is time-consuming here Method possible in which there is a risk that the thin wires during handling break without being noticed immediately. The consequence of this is that only after the windshield has been manufactured the errors are noticed and the entire disc must therefore be discarded.

In a similar known procedure, which also relies on the arrangement of individual antenna wires in the intermediate layer of a laminated glass that exists on the plastic Windshield runs out (US-PS 3208070), the teaching is also taught, the antenna wires to cover with a layer of black nylon. When using particularly thin antenna wires, which have to be embedded in the intermediate layer, there is an increased risk that the thin Antenna wires can be damaged during handling. If now these thin antenna wires are sheathed by a nylon layer that is responsible for their

Although safer handling is initially useful, it is then no longer possible to optically detect a broken wire after embedding the wires. In this case, too, can only after the windshield has been completely manufactured

μ Damage can be recognized. In addition, this production method also requires complex UnCl ₁ time-consuming work steps, since the thin antenna wires are carefully placed on the intermediate layer

3 4

arranged or must be embedded in this, rens to apply the electrically conductive material-a coloring at the upper edge of the windbreak rials on the glass pane, and
In the known method there is either a side cross-section through one of the glass fabric interlayer on which the multilayer glass or on the side of the plastic is electrically conductive material applied to another plastic interlayer of the furnace for performing the bending process, which forms the embedded antennae - disc,
nendräten is turned away. In Figs. 1 to 4, the front or wind protection

Finally, there is an electrically conductive multi-pane of a car in various representations layered safety glass known (GB-PS 720539), reproduced. A Verbei provided with an antenna the manufacture of which the electrodes are merely in an io collar glass unit 10 in the body of a car 11 Interlayer attached during the gluing process. An antenna circuit 13 is pressed into a front will. Disk 12 introduced or embedded.

The known antenna circuits are at least inside. As shown in FIGS. 2 to 4, the front is located inside the manufacturing process of the windshield 12 from two glass panes 14 and 15 and one The panes are mechanically relatively sensitive, js between these two layers 16 made of piaeine Damage even with careful handling of stikmaterial. The discs are together In the industrial manufacturing process there is no contact with the plastic material under heat and pressure ringers Probability, and thus their addition to a laminated glass pane was verbunsen production not yet displayed. with the lowest edge of the outside

The invention is based on the object of notching a 20 th pane of glass 15 before coating

Method for embedding antenna circles after or cut out, so I dap> .i a cutout

to create the preamble of claim i that inherits 17 within the finished unit (Fig. 3 and

cheap and simple production in series production 4).

The antenna circuit 13 of the laminated glass unit 10

Iungen of the embedded antenna circuit is in the form of a layer of conductive material

are closed. a pane of glass applied, namely as metal 1-

The solution to this problem is frit according to the invention on the outwardly facing surface of the

by the indicated in the characterizing part of claim 1 inner glass pane 14, so that thin horizontally

characteristics achieved. running line guides or lines 18 and

Advantageous embodiments of these task solutions 30 19 as well as vertical cable guides or lines 20

solution result from the dependent subordinate and 21 result. As Fig. 1 shows, the lines

address. from the individual straight upper lines run horizontally

The method according to the invention is very efficient line 22 and the shorter vertical line from the shaft and opens the way to a series production. In doing so, attention is paid to the antenna without considerable technical extra care that the horizontal lines of the antenna wall and thus in a cost-saving manner. The electrical circuit is as far as possible from the critical function and mode of action compared to the previously visible area of the windshield,
known forms of training of antenna circles The vertical line guides 20 to? 21 are not impaired in any way, 40 being arranged in the middle of the windshield at the same time, and the view of the occupants of the vehicle is not impaired, ie between the field of vision of the driver and the is impaired. The antenna is designed in such a way that the passenger, so that this section of the antenna is also outside the critical field of vision by simply plugging it into the driver's radio via a corresponding connection without a wide circle. These vertical sections are at the same time tool can be connected. 45 also the connection lines to the car radio,

It is advantageous that the silver frit paste on what this is done from the inner ends of the horizontal

Unbent glass pane located in the rough cut line guides 18 and 19 down to the

is applied so that the intimate connection with the lower edge of the windshield run, as well

the bending process of the glass sheet under pressure and shown in FIG.

Heating can be done together, sn The lines end in a roughly crescent or

Further features and advantages of the invention are semicircular line section 24, which are in front in the following, with reference to the drawings, is made of the same material and in the same wrote that, for example, embodiments are applied to the disk 14 like the reproduce. It shows Lin'sn himself. The line section 24 is in alignment

Fig. 1 is a perspective partial representation of the 55 to the cutout 17 of the outer glass pane 15 so front face one provided with an antenna circle as well as with a uniform incision 17 'of the tarpaulin Car, stik intermediate layer 16 (Fig. 4).

Fi g. 2 is a longitudinal section along line 2-2 of The cable guides are shown together with the

1, seen in the direction of the arrow, line section 24 onto the inner glass pane 14

Fi g. 3 shows a cross section along the line 3-3 of ao of the front pane 12, while the pane

Fig. 1 in the direction of the arrow, still in its unbent flat state

Fig. 4 is a stepped perspective view. A wide variety of electrical

a section of the antenna arrangement made of conductive materials such as silver, copper, paIa-

Fig. 3, dium or the like in the form of a paste or else

5 shows a perspective illustration similar to 1.5 in another conventional type of application.

1 of a further embodiment of the antennas. The fry paste used consists of 80

internal arrangement, up to 98 parts of powdered silver with 2 to 20 parts

6 shows a schematic representation of the method of a mixture of borosilicate and glass frit in one

organic matter.

As shown schematically in Fig. 6, the line guides can be applied in that they are drawn or brushed onto the surface of the disc by means of a tool 25 suitable for this purpose are, preferably in a width of about 0.13 to 0.38 mm.

During this process, the glass pane rests on a holder 26. The guide rings can however also have a width of up to approx. 0.76 mm and preferably in a continuously running manner Procedure are applied. For the application of the conductive material, printing processes are also available Use of templates, photographic processes, brushing or rolling and the like advantageous.

The stoving process required to create the metal lines on the glass is along with the heating of the glass pane for the anyway possesses a cutout 17 in the opposite of this lower edge guide. The glass unit is then placed on a bending form 27 and moves with it this shape through a bending furnace 28 (see. Fig. 7), so that with the bending process at the same time the applied Silver paste is baked in. After the bending process, the glass pane is removed from the bending furnace and removing the separating layer between the two inner surfaces of the two disks.

in that surface of the glass pane that forms the antenna circuit carries, is then subjected to a sulfur treatment until the lines of the Antenna circle uniformly clouded or cingcdunkclt are.

The glass panes are then put back together, with a Layer of plastic material of the same shape and size, which does not match the cutout 17 of the Antenna circle provided glass pane 15 corresponding

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If less or more heat is required, this can be done in an autoclave, for example be made.

In order to prevent unwanted reflections from the guide lines forming the antenna circuit the selection of the glass surface to which the metal frit is applied is important. Cheap Results are obtained when the outer surface of the inner glass pane is used for this, with Laminated safety glass in particular has proven itself.

After the lines of metal fritc on the surface are applied, they are obscured by chemical substances, with a considerable diminution the reflection phenomena, if not a complete prevention of this light reflection is achievable. A particularly effective treatment is that with a sulfur-containing one Substance with which the line surfaces can be quickly de-glossy.

In the event that a silver paste is used that contains chlorine, bromine, iodine or fluorine, will Surprisingly, both the rate of clouding of the silver streak and the general one Appearance improved when the subsequent processing of the lines or guide lines of the fanned Paste is made with sulfur or a sulfur compound.

A few examples of the production of linear elements applied to the glass pane are given below Guide lines for the antenna circuit shown, which have proven to be particularly advantageous to have.

Example I.

The antenna circuit is applied using a silk printing process with a silver frit paste, namely along the lines 18 to 21, as well as for the section 24 forming the connection area 1 and 4, on a surface of a glass pane, while this is still in the unbent state is located. Once the material is dry, a separating layer is put in place between the two sheets of glass Applied to the bending process, so that sticking together of the glass panes is prevented. the The second glass sheet applied to the first glass sheet and the intermediate layer is identical The size and shape of the first-mentioned pane and roll assembled laminated glass unit is like that constructed so that the printed glass pane is on the inside when installed in the vehicle, wherein the recesses 17 and 17 'are aligned one above the other and the one printed crescent-shaped Line section 24 forming the connecting paragraph leave free. An additional one takes place in an autoclave Heat and pressure, so that finally the inseparable self-contained

3D laminated glass unit results.

A lead wire 29 (Fig. 4) forms the connection to the car radio, for which this is on the line section 24 is soldered on.

As soon as possible, the section 17 is then provided with a heat and moisture resistant Plastic material filled in.

The lead wire 29 is at one point of attachment 30 opposite end advantageously with an electrical connection socket

4 (i provided, such as one half of a coupling socket 31.

Example II

While in embodiment I a silver frit paste is applied to the glass pane, here after firing and before the antenna circuit is exposed to a surface that opacifies it Substance sprayed with an acidic iodine, bromine, chlorine and / or fluorine solution.

so A specific solution for the pre-coated spray process, with which excellent results can be achieved consists of about 1% iodine with 1% hydrochloric acid in 98% isopropyl alcohol. It is beneficial when the halide additions are in the range of about 0.5 to 5%.

After the antenna circuit, as described above, has been pretreated, a treatment with sulfur is carried out by using a 1 to 10% solution of sodium sulfide in water is sprayed at room temperature. Here the surface of the antenna circle becomes dark immediately.

It is also essential in the last-mentioned process step that the spraying of the cloudiness the solution that was used for the pretreatment washes off again, so that adverse reactions between the two solutions cannot occur.

Example III

This example corresponds to example II, with the exception of the pretreated step of immersion or also overspraying with an acid solution containing a halide, dipping or overspraying with followed by a solution of a sulfur compound. In contrast to the aforementioned examples, however A metal component is added to the sulfur solution, which intensifies the coloring of the antenna circle and also creates a Change in the achievable tint can be made.

A solution for this consists of a 2 to 10% Na ₂ S.9H ₂ O solution with a 5 to 10% metal compound such as lead tetraacetate, lead sulfide, a divalent copper sulfide, tin sulfide or cobalt sulfide. Using this solution, the metal also causes the formation of a very thin metallic layer on the surface of the silver frit.

Example IV

This example leads back to Examples II and III insofar as an element of the halogen group is also used here. In the present example, however, this element is in the metal frit brought in myself. For this purpose, 1.5 to 5% iodine is added to the conventional silver frit paste. It is also possible to mix in 3 to 10% silver iodide of the conventional, known silver frit paste before it is applied to the glass surface to form the antenna pattern.

Example V

In the following example, the process steps for applying the conductive material are identical to those given in Example I. However, the blackening of the silver forming the antenna lines takes place by means of an electrochemical process. Here, the paste used can be introduced into an accelerator for the clouding process, using an electrolyte or a coating solution consisting of an approximately 10% sodium sulfide solution. For a continuous production process, however, a dilute NaOH solution through which H ₂ S is passed can also be used with very favorable results.

A modification of the electrochemical processing consists in the use of a chloride bath, for example a sodium chloride solution or a mixture of NaCl and HCl, so that silver chloride is formed.

Example VI

According to this embodiment, the printed circuit including the sifter is in contact a fresh concentrated ammonium sulfide kteung at room temperature until a sufficient cloudiness or discoloration is achieved. Here If the surface is left to act for about two minutes, the surface is sufficiently dark ■ et the line guides.

Example VII

Here is a 10% aqueous solution of sodium BBBuIfid, which with elemental sulfur powder is saturated, heated to approx. 77 ° C at room temperature and the printed one containing the silver Circuit introduced into this solution. A one kungs / .cit of one minute already gives a even, dark coloring.

Example VIII

In accordance with this exemplary embodiment, they are burned onto the glass surface Silver-containing lines of the antenna for coloring the surface of which is sprayed with a stabilized sodium polysulphide solution.

The solution is effective in concentrations below 0.25% and at temperatures between approx. 71 to 91 ° C. An about 1% solution at one temperature of about 280 ° C is particularly advantageous, under these conditions the antenna bil dcnd lines in four to five seconds into a colored dark gray color. In detail, a preferably used bath of a clouding solution consists of 0.38 kg of sodium sulfide, which has been dissolved in 3.79 l of tap water and

2 (1 ches together with 0.32 kg of sulfur bloom to about 77 ° C is heated until it is dissolved. This basic solution is then mixed with approx. 76 liters of tap water of approx. Diluted 82 ° C and added 0.38 kg of a stabilizer. A solution prepared in this way is then for the

Spraying process ready.

Various neutral or alkaline compounds can be used as stabilizers, such as B. sodium nitrite, sodium thiosulfate, sodium sulfate, cellosolve. Sorbitol, corn syrup, glycerine,

.in triethylene glycol, ethylene glycol.

Example IX

The antenna circle as a silver frit is given a dark gray or black tint by means of the following lowing sulfur-containing organic substances: thioacetamide, dithiooxamide, 2-thio-orotic acid. The glass with the guidelines will be heated to about 99 ° C and the hot connections are applied to the wiring pattern. the Discoloration progresses extremely quickly. The heated compounds are effective in both the crystalline and molten states.

Example X

The antenna circle containing silver is colored by first setting it to about 121 ° C is heated, in order then to be introduced into a closed chamber which contains sulfur heated to the same temperature. The antenna circle

So here two to four minutes are exposed to this environment, resulting in an evenly black coloration. However, if you take the temperature of the Circle to 204 ° C and the sulfur temperature increases to 149 ° C, a corresponding coloring can be achieved with an exposure time of 8 seconds to 1 minute.

Example XI

In this example several specific Process steps for the clouding of a silver antenna circle given that this in connection with a sulfur and carbon mixture is brought. In one embodiment, equal parts of carbon powder and powdered sulfur are vigorously combined with sufficient water mixes, so that a thick pulp or paste results, which in a fairly thick layer on the Guide lines is applied. Below

the glass pane containing the antenna circuit is heated to a temperature of 121 ° C until a sufficient coloring has been achieved. This takes about four minutes.

A similar process step differs from the latter only in that the antenna circuit Sprayed "dry" with a mixture of 25 g each of carbon powder and sulfur precipitate will, v. jlche in 50 ml of distilled water and 100 ml isopropyl alcohol is "hand-whisked" and closed to which a further 100 ml of isopropyl alcohol are added until the antenna circuit are sufficiently coated.

In a third process step, equal parts of precipitated sulfur powder and decolorized carbon powder are dry mixed with one another and this mixture is applied to the conductor lines of the antenna circuit at a temperature of 121 ° C. As in the case of using a spray method or the paste mentioned, the circuit also needs to be heated for about four minutes with the dry powder method.

Example XII

Here the clouding of the antenna circuit containing silver is caused by bringing it into contact achieved with a sulfur compound, at an elevated temperature, while the antenna circuit is covered by another pane of glass. One such method is to use a dry one Mixture of sulfur and salt powder on the

Apply antenna circle. In a modification, however, the antenna circuit can also be continuous with one "Dry" spray are covered until the circle is barely perceptible, whereby the Spray from one part precipitated sulfur powder and two parts sodium sulphate, in 400 ml isopropyl alcohol whisked, and where the mixture of isopropyl alcohol consists of 400 ml of alcohol 300 g of the dry mix makes up and another 100 ml of alcohol can be added.

In a further method, the antenna circuit can be brought into connection with a chromatographic paper or another absorbent material which is soaked with a sulfur-saturated alcohol solution and which is made from 400 ml of methanol, 10 g of sodium sulfide (Na ₂ S 9H ₂ O) and 50 g Sulfur powder is made.

When using any of these methods, the antenna circle carrier and the counterpart, the

H) ncndc glass pane heated to about 93.3 ° C cp. The dry mixture is sprayed on or the impregnated paper is applied to the cable guides. The second or opposing glass pane is then placed on the antenna circuit in order to continuously heat the unit to the same temperature over a period of five minutes. The dry mix and spray processing require washing to remove the sulfur from said unit, but none

.in cleaning required for the aforementioned paper processing is.

For this purpose 2 sheets of drawings

Claims (10)

Claims; 1. Procedure for the introduction of an antenna circuit into one consisting of two panes of glass with a plastic layer in between Windshield of a motor vehicle during its manufacture, characterized by a) applying a silver frit paste to the first unbent in the blank Glass pane in a pattern of thin, narrow ones that determine the antenna circle Lines in a relatively broad figure like this at the bottom of the first pane of glass end that the figure with inserted windshield within the vehicle outline lies; b) the intimate connection of the silver frit paste with the first glass pane or burning on by heating after application; c) the coloring of the remaining surface of the antenna circuit by chemical darkening the silver frit paste; d) covering the pattern defining the antenna circle with the plastic layer and the second ;; Glass pane, both of which have a cutout that the corresponds to the relatively wide figure of the antenna pattern at the lower edge of the first pane of glass; e) connecting an insulated connection line to the relatively broad figure in the area of the two excerpts; and 0 filling in the cutouts with a heat and moisture resistant plastic material. 2. The method according to claim 1, characterized in that the thin, narrow lines of the pattern determining the antenna circle as the capital letter L inclined by 90 ° with the shorter ones Sides are formed against each other. 3. The method according to claim 1, characterized in that after the burning of the Antenna circle determining pattern this is treated with a halide and this Treatment following darkening is the action of a sulfur compound on the pattern includes. 4. The method according to claim 1, characterized in that the silver frit paste is a halide and the chemical darkening comprises exposure to a sulfur compound. 3. The method according to claim 3, characterized in that the treatment after burning the pattern comprises spraying a solution of 0.05% to 0.5% iodine with concentrated hydrochloric acid in isopropanol and the pattern treated in this way for chemical darkening with a - Up to ten percent sodium sulphide solution is sprayed over in water. fi. Method according to claim 5, characterized in that that the sodium sulfide solution contains 5 to 10% of a metal compound. 7. The method according to claim 1, characterized in that that the silver frit paste before application to the first pane of glass 3% to 10% Silver iodide is added and the treatment of the On the burned-on pattern, a sodium sulfide solution is sprayed on to chemically darken the pattern includes, 8. The method according to claim 1, characterized in that that the burned-on pattern of the antenna circle is darkened by an electrochemical treatment, one darkening the Substance-containing electrolytic liquid associated with the pattern becomes, and the connecting lead of the pattern to the anode and the electrolytic liquid connected to the cathode of a power source. 9. The method according to claim 1, characterized in that the chemical darkening of the baked pattern comprises the application of a stabilized sodium polysulfide solution. 10. The method according to claim 4, characterized in that the chemical darkening thereby occurs that the conductive material is exposed to a mixture of sulfur and carbon wild.