DE704961C - Electrically heatable, translucent body, especially a windshield - Google Patents

Description

iHÖIioflieek ^T:
oar. Ma. £ igenom

'30 MEI 1941

to- ISSUED ON
APRIL 12, 1941

The present invention is concerned with the fogging of translucent Bodies to prevent. It is already known that the fogging or icing of Vehicle window panes thereby prevent 211 that one the window itself or the -sir surrounding air is heated so that their Temperature above your dew or freezing point Jicgt.

There \ ■ Verden / .. example in windscreens of motor vehicles in the glass composition wires: embedded uis an electrically conductive material high resistivity, which are connected to the power source of the vehicle and heat the windscreen in this way. Ks are also 'so-called. Known heating panes that work on the same principle and are also attached to the windshield.

Furthermore, it is also known to use the heat generated by the motor vehicle engine, to let the warm air trapped under the bonnet sweep past the windshield in an ascending direction .. However, all of these known means are only imperfect solutions.

The disadvantage of the known wire inserts is a very uneven distribution of heat on. In the immediate vicinity of a heating wire, the temperature is on highest, only to drop off considerably with increasing distance from it. This creates tension in the translucent body. its easy to its destruction being able to lead. The heat loss, on the other hand, requires a stronger heating of the welding wire, which in turn is a strong one Load on the power source.

The treatment of windshields with hot air generated by the motor vehicle engine

Claims (2)

7049 (51 on the other hand, it has an insufficient degree of efficiency and, moreover, easily leads to pollution of the discs. The disadvantages of these devices occur particularly clearly when the Windshields, in addition to their purely protective effect, also serve to protect against the eyes must meet. This is especially the case when the windbreak) disk itself serves as a polarizing agent. Such windshields are known produced in a simple manner thereby. that the glass slide with a translucent Layer covers, the light directing; Has an effect. Such a windshield to heat with the known devices, offers considerable in practice Disadvantages, since the point or strip-shaped heating of the windshield causes the light) polarizing material easily detaches from the heated areas and thereby by distorting this layer, the light-polarizing effect cancels or the original, initial direction of oscillation changed. ; The inventor has now recognized that such windshields with a light-polarizing effect is less important to achieve a point-like strong heating, rather than a uniform., ) to cause surface, but less heating of the entire translucent body. This eliminates the risk of icing vuii from the outset, without dalj excessive heating of the light-polarizing layer causes undesirable deformations suffers. It is true that windshields are already known that have one over their entire surface Have translucent metal or metal salt precipitate. However, this one Metal salt precipitate in addition to a certain degree of coloration due to the discoloration that occurs here To cause damping of the headlights of oncoming vehicles. There are furthermore known facilities in which on a windshield in the form of a Frame an opaque metal deposit is applied. These bodies however, have the disadvantages of the non-planar η already described above Heating up. A metal deposit that extends over the entire surface to be heated has already been proposed for cooking and heating plates. However, it was of particular (this precipitate jründen this with a considerable thickness executed to a rapid conduction of heat obtained via the surface to be heated to. The recognition, one on a windshield aufgebrach- 6 _U th light transmissive Metallnicderschlag. Extends over the entire area, to electrically heat the windshield to prevent icing up, however, has not yet been disclosed anywhere. According to the invention, therefore, a translucent body, in particular a windshield, with a known per se for anti-glare purposes, designed as an odor pad and evenly transparent over the entire effective area of the translucent body Metal or metal salt mcdcrschhg proposed, with the special mark, that this body is arranged as a resistor in an electrical circuit is. It is in the sense of discovery. the metal chip, as described above, to be carried out light-polarizing at the same time. The present invention is not limited to windshields. It is applicable in any other translucent body with fogging or Freezing should be avoided. The invention can be z. B. in shop windows. Upper door window, glass container walls. Schoimvcrfcrabdcckdecks, Kaltckammerbrobachtungsfc-nsirrn. photographic lenses, especially for aviator cannons, etc. use. 1Ά τ ι: ν τ λ χ rf 1 ¹ κ rc J1 κ: ι. Translucent body, in particular <) 5 more windshield, with one for Anti-glare purposes known per se, designed as one or overlay and themselves extending evenly over the entire effective area of the translucent body transparent metal or metal salt precipitate, characterized in that that this body is arranged as a resistor in an electrical circuit. 2. Translucent body according to claim i, characterized in that the A body arranged as a resistor in a circuit has a horizontal positioning effect having. in the ·,