Stock material or miscellaneous articles – Composite – Of quartz or glass
Reexamination Certificate
2000-04-14
2003-07-15
Jones, Deborah (Department: 1775)
Stock material or miscellaneous articles
Composite
Of quartz or glass
C428S428000, C428S469000, C428S472000, C428S698000, C428S699000, C428S702000
Reexamination Certificate
active
06592996
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a solar-shading light-transmissive panel with a multi-layer film including an Ag-rich layer comprising Ag as a main component, and a solar-shading multi-layer light-transmissive panel which employs such a solar-shading light-transmissive panel.
2. Description of the Related Art
In recent years, multi-layer window glass panes have been in widespread use to meet demands for highly hermetic, heat-insulated residential houses. For the purposes of increasing heat-insulating and solar-shading capabilities, there have also been widely used multi-layer glass panels with a multi-layer film including an Ag-rich layer comprising Ag as a main component. If a multi-layer glass panel with a multi-layer film including an Ag-rich layer is used as a window glass pane, then the window with such a window glass pane has increased heat-insulating and solar-shading capabilities. The heat-insulating capability is effective to cut down on the cost of heating the room in winter, and the solar-shading capability makes it possible to reduce the cost of air-conditioning the room in summer.
One conventional glass panel with a multi-layer film including an Ag-rich layer is disclosed in Japanese patent publication No. 7-15143, for example. As shown in
FIG. 1
of the accompanying drawings, the disclosed glass panel comprises a transparent glass sheet
11
, a first transparent dielectric layer
13
, an Ag-rich layer
15
, and a second transparent dielectric layer
17
. The three layers
13
,
15
and
17
are disposed successively on the sheet
11
. The three layers
13
,
15
,
17
jointly make up a multi-layer film which will be referred to as “single-Ag LowE”.
Another conventional glass panel with a multilayer film including an Ag-rich layer is disclosed in Japanese laid-open patent publication No. 7-165442. As shown in
FIG. 2
of the accompanying drawings, the disclosed glass panel comprises a transparent glass sheet
11
, a first transparent dielectric layer
13
, a first Ag-rich film
15
, a second transparent dielectric layer
17
, a second Ag-rich layer
19
, and a third transparent dielectric layer
21
. The five layers
13
,
15
,
17
,
19
and
21
are disposed successively on the glass sheet
11
. The five layers
13
,
15
,
17
,
19
,
21
jointly make up a multi-layer film which will be referred to as “double-Ag LowE”.
Japanese laid-open patent publication No. 7-149545 discloses still another conventional glass panel with a multi-layer film including an Ag-rich layer. AS shown in
FIG. 3
of the accompanying drawings, the disclosed glass panel comprises a transparent glass sheet
11
, a first transparent dielectric layer
13
, a first Ag-rich layer
15
, a second transparent dielectric layer
17
, a second Ag-rich layer
19
, a third transparent dielectric layer
21
, a third Ag-rich layer
23
, and a fourth transparent dielectric layer
25
. The seven layers
13
,
15
,
17
,
19
,
21
,
23
and
25
are disposed successively on the transparent glass sheet
11
. The seven layers
13
,
15
,
17
,
19
,
21
,
23
,
25
jointly make up a multi-layer film which will be referred to as “triple-Ag LowE”.
A comparison of the double-Ag LowE and the single-Ag LowE which have the same visible light transmittance indicates that the double-Ag LowE has a better solar-shading capability. Therefore, a multi-layer glass panel with the double-Ag LowE, which is used as a window glass pane, is more effective to suppress an indoor temperature rise due to solar radiation than, but introduces as much indoor light during daytime as, a multi-layer glass panel with the single-Ag LowE, which is used as a window glass pane.
A comparison of the triple-Ag LowE and the double-Ag LowE which have the same visible light transmittance reveals that the triple-Ag LowE has a better solar-shading capability. Therefore, a multi-layer glass panel with the triple-Ag LowE, which is used as a window glass pane, is more effective to suppress an indoor temperature rise due to solar radiation and hence to reduce an air-conditioning load than a multi-layer glass panel with the Double-Ag LowE, which is used as a window glass pane, while keeping a desired level of indoor light during daytime.
However, the double-Ag LowE is more costly than the single-Ag LowE to produce the films because the double-Ag LowE has more layers than the single-Ag LowE. Similarly, the triple-Ag LowE is more costly than the double-Ag LowE to produce the films because the triple-Ag LowE has more layers than the double-Ag LowE.
Office buildings find it most desirable to reduce an air-conditioning load from an energy saving viewpoint. For reducing the air-conditioning load on office buildings, solar-reflecting glass panels comprising one or more layers of metal oxide, metal, or metal nitride disposed on a transparent glass sheet are widely used as window glass panes for such office buildings. The conventional solar-reflecting glass panels are highly effective in reducing the air-conditioning load because they have as high a solar-shading ability as the triple-Ag LowE.
The solar-shading capabilities of glass panels with the single-Ag LowE and the double-Ag LowE are lower than the solar-shading capability of the conventional solar-reflecting glass panels. For this reason, indoor temperature increases due to solar radiation through office building window glass panes which comprise multilayer glass panels with the single-Ag LowE and the double-Ag LowE are greater than those through office building window glass panes which comprise conventional solar-reflecting glass panels. Consequently, it is preferable to use solar-reflecting glass panels as window glass =panes in terms of the solar-shading capability.
However, the visible light transmittance of solar-reflecting glass panels is much smaller than the visible light transmittance of the glass panels with the single-Ag LowE, the double-Ag LowE, or the triple-Ag LowE. If solar-reflecting glass panels are used as window glass panes, therefore, the rooms with those window glass panes are relatively dark during daytime, and the window glass panes give an unnatural impression to occupants in the rooms.
There has been known a solar-reflecting glass panel whose visible light transmittance has been increased by reducing the thickness of a metal or metal oxide film thereof for solving the above problem. However, the solar-reflecting glass panel with its visible light transmittance thus increased naturally has a reduced solar-shading capability. The solar-shading capability of a glass panel with the triple-Ag LowE is substantially the same as the solar-shading capability of a conventional solar-reflecting glass panel. However, such glass panel with the triple-Ag LowE is highly expensive to manufacture because the triple-Ag LowE is made up of seven layers.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a solar-shading glass panel having a higher visible light transmittance than that of a conventional solar-reflecting glass panel and a solar-shading capability substantially equivalent to that of a glass panel with the double-Ag LowE or a conventional solar-reflecting glass panel.
Another object of the present invention is to provide a solar-shading glass panel which basically has four layers and hence can be manufactured relatively inexpensively.
According to the present invention, a solar-shading light-transmissive panel has a light-transmissive sheet, an absorbing layer disposed on said light-transmissive sheet, a first transparent dielectric layer disposed on said absorbing layer, an Ag-rich layer comprising Ag as a main component disposed on said first transparent dielectric layer, and a second transparent dielectric film disposed on said Ag-rich layer.
The light-transmissive sheet may be a glass sheet which is transparent or semitransparent in at least a visible light range or a synthetic resin sheet which is transparent or semitransparent in at least a visible light range. The glass sheet may b
Arai Daisuke
Kunisada Terufusa
Ogino Etsuo
Jones Deborah
Nippon Sheet Glass Co. Ltd.
Piziali Andrew T
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