The object of the invention is window as defined in the preamble of claim 1, which comprises at least two selective glass panes coated with a selective film.

Selective glasses are used in windows for improving the energy efficiency of buildings. Selective glass panes comprise a thin metal or metal-oxide film, which is electrically conductive. Shortwave thermal radiation from the sun and visible light pass through selective glass fine, but long-wave thermal radiation trying to pass from inside to outsidejreflects from the film back into the room. .. ^· · ^ i: ^■ of Thei problem in windows provided with selective glass panes is that the coating of selective glasses damps the passage of radio waves, which is detrimental, because e.g. the audibility of mobile phones inside ^~' a building deteriorates or may be lost altogether owing to the selective glass. For improving the penetration of radio waves, the selective glass panes are provided with uncoated areas, through which radio waves can pass inside of a building. If the square area of the uncoated area is large, thermal insulation capacity may be impaired essentially.

The aim of this invention is to achieve a window provided with selective glass panes with high thermal insulation capacity and penetration ability of radio waves.

Brief description of the invention The window according to the invention comprises at least two selective glass panes coated with a selective film. Selective glass panes are provided with an uncoated area for improving the penetration of radio waves. In one selective glass pane the uncoated area is lattice-shaped and in other selective glass panes the uncoated area is at the same point as the lattice-shaped uncoated area.

A significant advantage of the solution according to the invention is that by the lattice-shaped uncoated area it is possible to achieve a minor damping of radio waves and at the same time the square area of the uncoated area can be kept small. Thus the thermal insulation capacity and surface temperature of selective glass do not essentially lower due to the impact of the uncoated area, whereby condensate phenomenon and draft and draught phenomena effecting on housing comfort are insignificant, and the energy economics of the building does not weaken essentially.

Brief description of the figures

In the following, the invention will be described in more detail by the aid of an embodiment with reference to the attached drawings, wherein

Fig. 1 presents a cross-section of a window comprising two consecutively arranged selective glass panes.

Fig. 2 presents a front view of selective glass of window of * · Fig. 1, which comprises a lattice-shaped, uncoated area. Fig. 3 presents a front view of selective glass of windo of

Fig. 1, in which the uncoated area is of the same size and form as the area defined by the lattice-shaped, uncoated area of the selective glass of Fig. 2.

Detailed description of the invention

Fig. 1 presents a window 1, e.g. a window of a building. The building can be e.g. a residential building, vacation home, office building, commercial building or industrial building. Window 1 comprises at least two selective glass panes 2, 3 coated with a selective film 4. Typically the window 1 comprises 2-4, or even more than four consecutively arranged glass panes, of which at least two are coated with a selective film 4. All the glasses of the window can be selective glasses. The glass panes 2, 3 are arranged to the window frame 8.

The selective film 4 is a thin metal or metal-oxide film, which is electrically conductive. The selective film 4 lets visible light through well, but it blocks the passage of other wavelengths, such as rad io waves, through the window structure. The thickness of the selective film 4 is typically 5-100 nm. The coating can be either a hard or a soft coating . A hard coated selective glass can be used as a separate glass. A soft coated selective glass is used so that the coated side is towards the gas space between two g lass panes.

There is an u ncoated area 5, 6 in the selective glass panes 2, 3 for improving the penetration of radio waves. The uncoated area 5, 6 is formed on the selective glass pane 2, 3 on the su rface coated with a selective film 4. In the uncoated area 5, 6, the selective film 4 has been removed e.g . by gri nding or in some other way. In one selective glass pane 2 of the window 1, the u ncoated area 5 is lattice-shaped or lattice- formed . Typically, only in one selective glass pane 2 the u ncoated area 5 is lattice-shaped . In other selective glass panes 3 the uncoated area 6 is at the same point in horizontal and/or vertical direction as the lattice- shaped uncoated area 5.

The selective film 4 and the lattice-shaped, u ncoated area 5 formed on the selective film 4, is formed on the outermost selective glass pane, which is intended to be a fagade of a building . Accord ing to one embodiment of invention the lattice-shaped, uncoated area 5 is formed on the innermost selective glass pane of the window, i.e. on the selective glass pane nearest to the interior of the bu ilding, when the window has been installed in place. The selective film 4 and the lattice- shaped u ncoated area 5 can be on the outer surface or on the inner su rface of the selective g lass pane. The lattice-shaped, u ncoated area 5 is formed from the uncoated elements 7 arranged adjacent to each other and/or one on the other. The adjacent, u ncoated elements 7 are parallel . The uncoated elements 7 one on the other are parallel. The width of the uncoated elements 7 is up to 5 mm, typically 0, 1-5 mm. The combined area of the u ncoated elements 7 is not more than 30 %, typically 1 -30 % of the area defined by the lattice-shaped, uncoated area 5.

In other selective glass panes 3 the u ncoated area 6 is of the same form as the area defined by the lattice-shaped, uncoated area 5. In other selective glass panes 3 the uncoated area 6 is of the same size as the area defined by the lattice-shaped, uncoated area 5. Typically, the area defined by the lattice-shaped, uncoated area 5 is of square shape or of rectangular (in Fig. 2) shape. Then in other selective glass panes 3 the uncoated area 6 is also of square shape or of rectangular shape. In other selective glass panes 3 the selective film 4 and the uncoated area 6 formed on it can be on the outer surface or on the inner surface of the glass pane. In other selective glass panes 3 the coating has been totally removed from the uncoated area 6.