JPH0440161Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention relates to window glass disposed in the windows of buildings.

[Prior art and its problems]

It is known to use half-mirror glass in order to cut as much sunlight as possible from entering the room through window glass. FIG. 4 is a longitudinal sectional side view showing a conventional example of a window glass incorporating such a half mirror, in which the half mirror surface 4 is formed to cover the entire outer surface of the ordinary glass 3. In this way, part of the solar radiation directed from the outdoor A side to the indoor B side is reflected by the half mirror surface 4 and returns to the outdoor A side, and the rest passes through the glass 3 and enters the indoor B side.

By the way, in such a conventional window glass, the solar radiation in the summer shown by the solid line and the solar radiation in the winter shown by the broken line are reflected to the same extent on the half mirror surface 4. It was not possible to obtain such fine detail. Therefore, in order to respond to seasonal changes, a panel structure has been developed that does not impede the transmission of light when the sun's altitude is weak and low, but when the sun's altitude is high and the light becomes strong, the amount of transmitted light is reduced by reflection. Seen in Publication No. 51-74426. This is a method in which ribs with a light reflecting effect are provided between two or more translucent panels, but the spacing and angle between the ribs are not particularly limited, and it is used as a method of controlling solar radiation shielding. There are only three methods: entering the light between the ribs and directing it directly into the room, bending it outside with one reflection from the ribs, and bending the light into the room with one reflection from the ribs, and it lacks detail. It was hot.

[Purpose of invention]

The purpose of the present invention is to eliminate the disadvantages of the conventional example,
Window glass that uses double reflection to block as much of the summer sunlight as possible, and allows as much of the winter sunlight to enter the room, providing performance that adapts to seasonal changes and improving livability. Our goal is to provide the following.

[Key points of the idea]

However, according to the present invention, the purpose of the lever is: solar altitude: θ, glass thickness: t, angle of the half mirror layer:
α, interval between half mirror layers: D, lowest solar altitude to be cut: θs, interval D between the lower end of the upper half mirror layer and the upper end of the lower half mirror layer
≧t・tan θs, angle α≧ from outside to inside
This is achieved by forming a plurality of half mirror layers inside the glass that rise in an oblique direction at 90°-θs.

[Example of idea]

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 and 2 are longitudinal sectional side views showing an embodiment of the window glass of the present invention, FIG. 1 showing the case in summer, and FIG. 2 showing the case in winter.

In the window glass of the present invention, half mirror layers 2, 2', 2'', . . . rising obliquely from the outside to the inside are formed at appropriate intervals in a plate-shaped glass body 1.
The angles and intervals of the half mirror layers 2, 2', 2'', etc. are set with the main purpose of cutting solar radiation in summer.The altitude of solar radiation to be cut in summer depends on the orientation of the windows and the load characteristics of the building. Therefore, as shown in Figure 3, solar altitude: θ Glass thickness: t Angle of half mirror layer 2: α Distance between half mirror layer 2: D Minimum solar altitude to be cut: θs In this case, the angle α and the interval D of the half mirror layer 2 may be determined so that the solar altitude θ≧θs can be effectively cut.

Specifically, this angle α is set so that sunlight at an altitude higher than θs can be reflected.
As shown in part A of Fig. 3, if sunlight enters from above the perpendicular to the surface of the half mirror layer 2, it will always be reflected to the outside, so θs≧90°−α ∴α≧90°−θs… (1) becomes.

In this way, as shown by the arrow in FIG. 1, part of the solar radiation during the summer when the solar altitude is relatively high is reflected by the half mirror layer 2 and returned to the outdoor side A. The remainder passes through the half mirror layer 2 and reaches the lower half mirror layer 2', where a portion is reflected again. In this way, the condition where solar radiation is reflected twice is D≧t・tan θs (2), as shown in part B of Figure 3.

Therefore, α and D may be set so as to satisfy both equations (1) and (2). Furthermore, if D is considered only in terms of the cut of summer solar radiation, the smaller it is, the better; however, as will be described later, it should be comprehensively determined in consideration of winter as well. Further, the glass thickness t is determined based on wind pressure resistance and the like.

On the other hand, regarding winter solar radiation at a relatively low solar altitude, as shown in Figure 2, there are two types of solar radiation that pass through the mirror layers 2, 2', 2'', etc. and directly enter the indoor B side (solid line arrows). The light is divided into light that passes through the half mirror layer 2' and light that is reflected, and the reflected light is further reflected on the lower surface of the upper half mirror layer 2 and enters the room B.
The cut rate is divided into those that enter the room and those that exit to the outside A, and the cut rate in the half mirror layer is extremely low compared to the case in the summer season shown in Fig. 1.

[Effect of idea]

As mentioned above, when the window glass of the present invention blocks solar radiation with a half mirror built into the glass, most of the summer solar radiation is blocked by two reflections to the outside, and the winter solar radiation is directed inside. By combining the reflection of light, the light that passes through the half-mirror layer, and the light that passes between the half-mirror layers and enters the room directly, we have reduced the amount of cut and brought it indoors as much as possible, so it is possible to change the season. It can demonstrate fine-grained performance that responds to changes in the environment, and can further improve livability.

[Brief explanation of the drawing]

1 and 2 are longitudinal sectional side views showing an embodiment of the window glass of the present invention, FIG. 3 is a side view of the same, and FIG. 4 is a longitudinal sectional side view showing a conventional example. 1... Glass body, 2, 2', 2''... Half mirror layer, 3... Glass, 4... Half mirror surface.

Claims (1)

[Scope of utility model registration request] Sun altitude: θ, glass thickness: t, angle of half mirror layer: α, spacing between half mirror layers: D, lowest solar altitude to be cut: θs, the lower end of the upper half mirror layer and the lower half mirror layer. A window glass characterized in that a plurality of half mirror layers are formed inside the glass, the distance from the upper end being D≧t·tan θs, and the half mirror layers rising obliquely from the outside to the inside at an angle α≧90°−θs.