JPH05159746A - Room of reducing visibility from the outside - Google Patents

Abstract

PURPOSE:To make unvisible the inside of a room from the outside by using a window, in which emitting energy except in a specific wavelength region is 40% or less the total emitting energy, and setting permeability of the specific wavelength region of the transparent window lower than the permeability except of the specific wavelength region. CONSTITUTION:A lighting lamp 4 formed of transparent mercury lamp is arranged in the inside of a room 3 consisting of internal surface white color opaque walls 1 in three sides and bringing the rest of one side into contact with external space through a transparent window 2. Lighting light of the lamp 4 has specific spectral emission distribution. The window 2 has a specific spectral permeability characteristic by laminating silicon dioxide films of high and low refractive index on a glass plate 2A and further by coating a metal chrome film. In the case of lighting the mercury lamp in the inside of the room by putting out lighting in the outside, the lighting light in the inside of the room is almost not leaked to the outside, and when the inside of the room is watched from the external space by naked eyes, a condition in the inside of the room can be almost not discriminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a room in which it is difficult to see the inside from the outside through a window, and particularly to a room such as a house or a building, an interior space of an automobile, a store such as a restaurant or a retail business, You can see the outside, but you can see the outside of the room from the outside.

[0002]

2. Description of the Related Art Rooms such as office buildings, living rooms of private houses, etc., in which lighting lamps are provided inside and windows are provided in the openings are difficult to see from the outside, and there is a demand for ensuring so-called privacy. large. In response to this requirement, the glass plate of the transparent window is coated with a thin film such as a metal oxide or a metal nitride to increase the reflectance of the window and at the same time reduce the visible light transmittance to reduce the internal space from the outside. It is known that the visibility when looking is reduced. Further, it is known that lighting is applied to the edge surface of the glass of the transparent window to make the entire glass brighter, thereby reducing the visibility from the outside to the interior space of the room.

However, according to the former, when the interior space is viewed from the outside when the exterior space is brighter than the interior space such as during the daytime, the amount of light reflected from the transparent window surface is large while the interior space is brighter. Since the amount of transmitted light is small (Fig. 31 (a)),
Although the visibility is reduced, when the external brightness at night is much smaller than the internal space brightness, the reflectance from the window surface becomes relatively small and the transmitted light from the inside Is clearly visible, and the state of the internal space can be seen (FIG. 31 (b)). On the other hand, if the latter is provided with an illumination on the glass edge, the visibility when seeing the internal space from the outside is reduced regardless of the brightness of the outside, but it is necessary to provide the illumination, resulting in a large window structure. There is a problem that extra power is required and power consumption is large.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, that is, when the interior of the room is viewed from the outside, it is in the room both at daytime and at night. An object of the present invention is to provide a room in which people and objects in the room can hardly be seen, and moreover, the room can be illuminated brightly with small power consumption.

[0005]

DISCLOSURE OF THE INVENTION The present invention is a room in which an illuminating lamp is provided and a transparent window is provided in an opening, and as a light source of the illuminating lamp, at least one specific wavelength consisting of a line spectrum is provided. Has an emission spectrum composed of an emission band of a region and an emission band mainly of a continuous spectrum other than the specific wavelength region, and the emission energy in the region other than the specific wavelength region is 40% of the total emission energy.
By using the following, by making the light transmittance of the specific wavelength region of the transparent window lower than the light transmittance other than the specific wavelength region, the visibility when viewing the inside of the room through the transparent window from the outside It is a room with reduced sex.

As the light source of the illumination lamp used in the present invention, a fluorescent lamp (for example, a fluorescent lamp Palook manufactured by Matsushita Electric Works, Ltd.), a mercury lamp (for example, a transparent mercury lamp manufactured by Matsushita Electric Works, Ltd.), and a fluorescent mercury lamp (for example, manufactured by Matsushita Electric Works, Ltd.) are used. Pana super mercury lamp), a metal halide lamp (for example, multi-halogen lamp manufactured by Matsushita Electric Works, Ltd.), a low-pressure sodium lamp (for example, super sodium manufactured by Matsushita Electric Works, Ltd.), and the like.

In order to achieve the object of the present invention by operating the lighting lamp with a relatively small power consumption which can be practically used, the light source of the lighting lamp emits light in at least one specific wavelength region consisting of the emission of the line spectrum. It is necessary to have a band and an emission band mainly composed of a continuous spectrum other than the specific wavelength region, and the emission energy outside the specific wavelength region should be 40% or less of the total emission energy.

From the viewpoint of increasing the total efficiency represented by (effective luminous flux / power consumption) of illumination, it is more preferable that the emission energy in the region other than the specific wavelength region is 20% or less of the total emission energy.

In particular, blue-violet (wavelength 400 to 480 nm),
Green (wavelength 500-570nm), red (610-700n)
The three-wavelength band emission lamp having at least one line spectrum in each area of (m) can illuminate the room with relatively low power consumption and can illuminate brightly, and also the inside of the room can be visually recognized from the outside. It is preferable because the property can be lowered.

The blue-violet, green, and red wavelength ranges can be set by arbitrarily selecting phosphors. However, when the wavelength range is widened, the wavelength range in which the light transmittance of the transparent window is low is widened. As the amount of light transmitted through the transparent window decreases, it becomes difficult to control the transmittance of the transparent window. When the specific wavelength region is one, the wavelength width is 200 nm or less, in two cases it is 100 nm or less, and in three cases it is 80 nm each.
It is preferably nm or less. If the wavelength width of the specific wavelength region is narrow, the illumination efficiency of the illumination lamp is lowered, and it becomes difficult to obtain bright illumination, which is not preferable. From the viewpoint of not lowering the illumination efficiency of the illumination lamp, it is preferably 20 nm or more.

As the illumination lamp used in the present invention, the above-mentioned light source may be used as it is, but the optical filter member having wavelength selectivity is used before the light emitted from the light source reaches the transparent window. It is possible to use those provided so as to pass through.

As such an optical filter member, for example, a glass plate or a plastic plate coated with a metal film or a metal nitride film that absorbs light by itself, or a transparent oxide having a higher refractive index and a refractive index higher than that of the transparent oxide having a higher refractive index are used. A known optical filter having wavelength selectivity in which a glass plate or a plastic plate is covered with a multilayer film in which low transparent oxides are alternately laminated can be used.

As the transparent window according to the present invention, a transparent plate coated with a known optical multilayer film having wavelength selectivity is used. A glass plate or a plastic plate can be used as the transparent plate. Further, the organic film coated with the optical multi-layered film having the wavelength selectivity can be used by adhering it to a transparent plate.

Further, a colored glass plate containing metal ions or metal colloids as a coloring component in the glass or a plastic plate colored with an organic pigment or an organic dye can be used.

The smaller the size of the spectral radiant flux transmitted through the transparent window and radiated to the outside with respect to the size of the spectral radiant flux incident on the transparent window, the lower the visibility of the inside of the room seen from the outside through the transparent window, Therefore, the privacy inside the room is further secured. It is preferable that the maximum value of the spectral radiant flux emitted through the transparent window is 5% or less and the maximum value of the spectral radiant flux incident on the transparent window is almost invisible and privacy is well secured. Further, it is preferable that the maximum value of the spectral radiant flux radiated through the transparent window is 1% or less of the spectral radiant flux incident on the transparent window in order to eliminate the visibility and secure privacy even at night.

Further, it is preferable that the transparent window has a light transmittance of 5% or more in a wavelength region other than the specific wavelength region in order to improve the visibility when the outside is seen from the inside of the room through the transparent window. It is more preferably 20% or more.

[0017]

The light emitted from the illumination lamp has a high emission intensity in the specific wavelength range and a low emission intensity outside the specific wavelength range. The light transmittance of the transparent window is associated with the wavelength characteristic of the light emitted from the illumination lamp, is small in the specific wavelength region, and is large in the wavelengths other than the specific wavelength region.
Therefore, the amount of light emitted from the illumination lamp that passes through the transparent window is greatly reduced. On the other hand, external light having a wavelength other than the specific wavelength range is not much attenuated even though it passes through the transparent window and enters the room. Thus, when an object outside the room is viewed from the inside of the room where the illumination lamp is arranged, the visibility of the object inside the room from the outside can be reduced while ensuring the visibility.

[0018]

Embodiments will be described in detail below based on embodiments. Example 1 As shown in FIG. 1, a room 3 having a width of 4 m, a depth of 4 m, and a height of 2.5 m, in which three sides are composed of an opaque wall 1 having an inner white surface, and the remaining one side is in contact with an external space through a transparent window 2. An illuminating lamp 4 made of a transparent mercury lamp was arranged in the central part of the.
The illumination light has a spectral radiant flux distribution as shown in FIG. Here, the transparent window 2 has a high-refractive-index titanium dioxide film and a low-refractive-index silicon dioxide film with a thickness of 20 on the glass plate 2A.
The dielectric multi-layered film 2B, which is changed in the range of up to 140 nm and alternately laminated by the vacuum evaporation method, is provided, and has the spectral transmittance characteristics as shown in FIG.

When the illumination of the incandescent lamp in the external space is turned off and the mercury lamp inside the room is turned on, the wavelength distribution of the incident light intensity at the point A in the room at a distance of 2 m from the light source is measured and The result of measuring the wavelength distribution of the incident light intensity at the point B in the external space at the same distance as that of FIG.
Shown in. From this, even though the distance from the light source is the same and the relationship with the wall surface is almost the same, that in the outside space is much smaller than the incident light intensity inside the room, that is, inside the room. It can be seen that almost no illumination light leaks to the outside. In this state, when the inside of the room was observed with the naked eye from the external space, the state inside the room was almost indistinguishable.

In this case, the total efficiency represented by (effective luminous flux / power consumption) of the illumination lamp 4 provided inside the room is about 30.
At (lm / W), this value was the same as the overall efficiency of the illumination lamp 4 itself. The average color rendering index of the lighting was 23.

Further, when the external space was illuminated with the illumination lamp 4 attached and the external space was visually inspected from the inside of the room, it was possible to identify the external state although coloring occurred. Further, in this state, when the inside of the room was seen with the naked eye from the external space, only the part of the external space where the illumination was directly incident was identifiable, but the other parts were almost unidentifiable. Example 2 As shown in FIG. 1, a room 3 having a width of 4 m, a depth of 4 m, and a height of 2.5 m in which three sides are composed of an opaque wall 1 having an inner white surface, and the remaining one side is in contact with an external space through a transparent window 2. An illuminating lamp 4 made of a transparent mercury lamp was arranged in the central part of the.
The illumination light has a spectral radiant flux distribution as shown in FIG. Here, the transparent window has a high-refractive-index silicon dioxide film and a low-refractive-index silicon dioxide film with a thickness of 15 to 150 n on a glass plate.
15 layers are formed by changing the thickness within the range of m, and a 16-nm thick metal chromium film is further coated, and has a spectral transmittance characteristic as shown in FIG.

When the illumination of the incandescent lamp in the external space is turned off and the mercury lamp inside the room is turned on, the wavelength distribution of the incident light intensity at the point A in the room at a distance of 2 m from the lamp is measured and FIG. 6 shows the result of measuring the wavelength distribution of the incident light intensity at the point B in the external space at the same distance as this. From this, even though the distance from the light source is the same and the relationship with the wall surface is almost the same, that in the external space is extremely small compared to the incident light intensity inside the room, that is, It can be seen that almost no illumination light leaks to the outside through the transparent window. In this state, when the inside of the room was observed with the naked eye from the outside space, the state inside the room was completely indistinguishable.

In this case, the total efficiency represented by (effective luminous flux / power consumption) of the lighting in the room is about 30 (lm /
In W), it was the same as the total efficiency of the mercury lamp itself used. The average color rendering index of the lighting was 23. On the other hand, when the incandescent lamp in the outside space was turned on with the mercury lamp inside the room turned on and the outside space was visually inspected from the inside of the room, coloring occurred, and although it was slightly dark, there was no problem in identifying the outside condition. It was possible. In this state, when the inside of the room was looked into from the outside space with the naked eye, it was completely indistinguishable. Example 3 As shown in FIG. 1, three sides are composed of an opaque wall 1 with a white inner surface,
Width 4 with the remaining 1 surface in contact with the external space through the transparent window 2
An illumination lamp 4 made of a sodium-thallium-indium-based metal halide lamp was placed in the center of a room 3 having a size of m, a depth of 4 m, and a height of 2.5 m. The illumination light has a spectral radiant flux distribution as shown in FIG. Here the transparent window is
An alternating repeating layer of titanium dioxide film and silicon dioxide film is formed on the glass plate 2A at a thickness of 1500 nm, and a metallic chromium film 12n is formed.
It has a spectral transmittance characteristic as shown in FIG.

When the incandescent lamp in the external space is turned off and the metal halide lamp inside the room is turned on, the wavelength distribution of the incident light intensity at the point A in the room at a distance of 2 m from the light source is measured and FIG. 9 shows the result of measuring the wavelength distribution of the incident light intensity at the point B in the external space located at the same distance as this. From this, even though the distance from the light source is the same and the relationship with the wall surface is almost the same, that in the external space is extremely small compared to the incident light intensity inside the room, that is, It can be seen that almost no illumination light leaks to the outside. In this state, when the inside of the room was observed with the naked eye from the outside space, the state inside the room was completely indistinguishable.

In this case, the total efficiency represented by (effective luminous flux / power consumption) of the lighting inside the room is about 70 (lm /
In W), it was the same as the total efficiency of the metal halide lamp itself. The average color rendering index of the lighting was 65.

On the other hand, when the illumination of the external space was turned on with the metal halide lamp inside the room turned on and the external space was visually inspected from the inside of the room, almost no coloring occurred. It was possible without problems. Further, when the inside of the room was observed with the naked eye from the external space in this state, it was completely indistinguishable. Example 4 As shown in FIG. 1, three sides are composed of an opaque wall 1 with a white inner surface,
Width 4 with the remaining 1 surface in contact with the external space through the transparent window 2
m in the center of room 3 with a depth of 4 m and a height of 2.5 m.
An illumination lamp 4 composed of a three-wavelength fluorescent lamp that emits light in a narrow band of green and red was arranged. The illumination light has a spectral radiant flux distribution as shown in FIG. Here, the transparent window is formed by coating a glass plate 2A with an alternating repeating layer of a titanium dioxide film and a silicon dioxide film of 1500 nm and further with a metallic chromium film of 12 nm, and has a spectral transmittance characteristic as shown in FIG. There is.

When the incandescent light bulb in the external space is turned off and the three-wavelength fluorescent lamp inside the room is turned on, two lights from the light source are emitted.
FIG. 12 shows the result of measuring the wavelength distribution of the incident light intensity at the point A in the room at the distance of m and the result of measuring the wavelength distribution of the incident light intensity at the point B of the external space located at the same distance from the light source. Show. From this, even though the distance from the light source is the same and the relationship with the wall surface is almost the same, that in the external space is extremely small compared to the incident light intensity inside the room, that is, It can be seen that almost no illumination light leaks to the outside. In this state, when the inside of the room was observed with the naked eye from the outside space, the state inside the room was completely indistinguishable.

In this case, the total efficiency of the lighting related to the inside of the room represented by (effective luminous flux / power consumption) is about 70 (lm /
It was the same as the total efficiency of the three-wavelength fluorescent lamp itself used in W). The average color rendering index of the illumination was 84.

On the other hand, when the illumination of the external space was turned on while the three-wavelength fluorescent lamp inside the room was turned on and the external space was viewed with the naked eye from the inside of the room, almost no coloring occurred, and although it was slightly dark, State identification was possible without problems. Further, when the inside of the room was observed with the naked eye from the external space in this state, it was completely indistinguishable. Example 5 As shown in FIG. 18, a room 3 having a width of 4 m, a depth of 4 m, and a height of 2.5 m, the three sides of which are composed of an opaque wall 1 having an inner white surface, and the remaining one surface is in contact with an external space through a transparent window 2. Transparent window 2
An illumination lamp 4 made of a transparent mercury lamp was arranged adjacent to the above. The illumination light has a spectral radiant flux distribution as shown in FIG. Here, the transparent window 2 uses a glass plate 2A in which a coloring material is uniformly dispersed, and has a spectral transmittance characteristic as shown in FIG.

When the illumination of the incandescent lamp in the external space was turned off and the mercury lamp inside the room was turned on, the wavelength distribution of the incident light intensity at the point A in the room at a distance of 2 m from the light source was measured, and the light source From the result of measuring the wavelength distribution of the incident light intensity at the point B of the external space at the same distance as this, and of the external space at the same distance from the light source and forming a 60 degree angle with the line connecting the light source and the point B The wavelength distribution of the incident light intensity at point C is shown in FIG. From this, it can be seen that even though it is at the same distance from the light source, it is much smaller in the external space compared to the incident light intensity inside the room, and this effect depends on the angle of incidence of the illumination light on the transparent window. I know there isn't. That is, it can be seen that the illumination light inside the room hardly leaks to the outside regardless of the incident angle of the illumination light with respect to the transparent window. In this state, when the inside of the room was observed with the naked eye from the external space, the state inside the room was almost indistinguishable.

Furthermore, when the exterior space was illuminated with the mercury lamp inside the room, and the exterior space was visually inspected from the interior of the room, it was possible to identify the exterior state without any problem although coloring occurred. It was Further, in this state, when the inside of the room was seen with the naked eye from the external space, only the part of the external space where the illumination was directly incident was identifiable, but the other parts were almost unidentifiable. Example 6 As shown in FIG. 18, a room 3 having a width of 4 m, a depth of 4 m, and a height of 2.5 m in which three sides are composed of an opaque wall 1 having an inner white surface and the remaining one surface is in contact with an external space through a transparent window 2. Transparent window 2
An illumination lamp 4 made of a transparent mercury lamp was arranged adjacent to the above. The illumination light has a spectral radiant flux distribution as shown in FIG. Here, the transparent window 2 uses a glass plate 2A in which a coloring material is uniformly dispersed and a surface of which is coated with a metal film, and has a spectral transmittance characteristic as shown in FIG.

When the illumination of the incandescent lamp in the external space is turned off and the mercury lamp in the room is turned on, the wavelength distribution of the incident light intensity at the point A in the room at a distance of 2 m from the light source is measured, and the light source From the light source at the same distance from the light source and the result of measuring the wavelength distribution of the incident light intensity at the point B of the external space on the extension line in the direction of the shortest distance connecting the light source and the transparent window. FIG. 22 shows the wavelength distribution of the incident light intensity at the point C in the external space forming an angle of 60 degrees with the line connecting the point B and the point B. From this, it can be seen that even though it is at the same distance from the light source, it is much smaller in the external space compared to the incident light intensity inside the room, and this effect depends on the angle of incidence of the illumination light on the transparent window. I know there isn't. That is, it can be seen that the illumination light inside the room hardly leaks to the outside regardless of the incident angle of the illumination light with respect to the transparent window. In this state, when the inside of the room was observed with the naked eye from the outside space, the state inside the room was completely indistinguishable.

Furthermore, when the exterior space was illuminated with the mercury lamp inside the room, and the exterior space was visually inspected from the interior of the room, it was colored, and although it was slightly dark, it was possible to identify the exterior condition without any problems. Met. Further, in this state, when the inside of the room was seen with the naked eye from the external space, the state inside the room was completely indistinguishable. Example 7 As shown in FIG. 18, a room 3 having a width of 4 m, a depth of 4 m, and a height of 2.5 m, which has an opaque wall 1 with white inner surface on three sides and the remaining one surface is in contact with an external space through a transparent window 2. Transparent window 2
Adjacent to, was arranged an illumination consisting of a three-wavelength fluorescent lamp that emits light in a narrow band of blue, green, and red wavelength regions. The illumination light has a spectral radiant flux distribution as shown in FIG. Here, the transparent window 2 has a spectral transmittance characteristic as shown in FIG. 24, which is made of a plastic plate in which a coloring material is uniformly dispersed and the surface of which is coated with a metal film.

When the lamp of the incandescent lamp in the external space is turned off and this lamp is turned on, the result of measuring the wavelength distribution of the incident light intensity at the point A in the room at a distance of 2 m from the light source and the light source The result of measuring the wavelength distribution of the incident light intensity at the point B of the external space on the extension line in the direction of the shortest distance connecting the light source and the transparent window at the same distance and the light source and the point B at the same distance from the light source FIG. 25 shows the wavelength distribution of the incident light intensity at the point C in the external space forming an angle of 60 degrees with the line connecting the lines. From this, it can be seen that even though it is at the same distance from the light source, it is much smaller in the external space compared to the incident light intensity inside the room, and this effect depends on the angle of incidence of the illumination light on the transparent window. I know there isn't. That is, it can be seen that the illumination light inside the room hardly leaks to the outside regardless of the incident angle of the illumination light with respect to the transparent window. In this state, when the inside of the room was observed with the naked eye from the external space, the state inside the room was almost indistinguishable.

Furthermore, when the illumination of the external space is turned on while the three-wavelength fluorescent lamp inside the room is turned on, and the external space is viewed from the inside of the room with the naked eye, it is possible to identify the external condition although it is slightly dark. there were. Further, in this state, when the inside of the room was looked into from the outside space with the naked eye, the state inside the room could not be identified. Example 8 As shown in FIG. 26, a room 3 having a width of 4 m, a depth of 4 m, and a height of 2.5 m in which three sides are composed of an opaque wall 1 having an inner white surface, and the remaining one side is in contact with an external space through a transparent window 2. Transparent window 2
An illumination lamp 6 made up of a fluorescent lamp 5 for general illumination surrounded by an optical filter 4 is arranged adjacent to. The illumination light has a spectral radiant flux distribution as shown in FIG. Here, as the transparent window 2, a colorant is uniformly dispersed in the plastic plate 2A, and the window surface is coated with a metal film. The transparent window 2 has a spectral transmittance characteristic. When the illumination of the incandescent lamp in the external space was turned off and the mercury lamp inside the room was turned on, the results of measuring the wavelength distribution of the incident light intensity at point A in the room at a distance of 2 m from the light source and The result of measuring the wavelength distribution of the incident light intensity at the point B in the external space on the extension line in the shortest direction connecting the light source and the transparent window at the same distance, and connecting the light source to the point B at the same distance from the light source FIG. 27 shows the wavelength distribution of the incident light intensity at the point C in the external space forming an angle of 60 degrees with the line. From this, it can be seen that even though it is at the same distance from the light source, it is much smaller in the external space compared to the incident light intensity inside the room, and this effect is due to the incident angle of the illumination light to the transparent window. I understand that it doesn't depend. That is, it can be seen that the illumination light inside the room hardly leaks to the outside regardless of the incident angle of the illumination light with respect to the transparent window. In this state, when the inside of the room was observed with the naked eye from the external space, the state inside the room was almost indistinguishable.

Furthermore, when the exterior space was illuminated with the mercury lamp inside the room, and the exterior space was visually inspected from the interior of the room, it was possible to identify the exterior condition without any problem although coloring occurred. It was Further, in this state, when the inside of the room was seen with the naked eye from the external space, the state inside the room was completely indistinguishable. Example 9 As shown in FIG. 26, a room 3 having a width of 4 m, a depth of 4 m, and a height of 2.5 m, which is composed of an opaque wall 1 having white inner surfaces on three sides and the remaining one surface is in contact with an external space through a transparent window 2. Transparent window 2
An illumination lamp 6 made up of a fluorescent lamp 5 for general illumination surrounded by an optical filter 4 is arranged adjacent to. The illumination light has a spectral radiant flux distribution shown in FIG. The transparent window 2 used here was a plastic plate 2A in which a coloring material of phthalocyanine blue was uniformly dispersed, and the plastic plate surface was coated with a metal film. Its spectral transmittance characteristic is shown in FIG.

When the illumination of the incandescent lamp in the external space was turned off and the mercury lamp inside the room was turned on, the wavelength distribution of the incident light intensity at the point A in the room at a distance of 2 m from the light source was measured and From the light source and the point at the same distance from the light source as a result of measuring the wavelength distribution of the incident light intensity at the point B of the external space on the extension line in the shortest direction connecting the light source and the transparent window. FIG. 30 shows the wavelength distribution of the incident light intensity at a point C in the external space forming an angle of 60 degrees with the line connecting B. From this, it can be seen that even though it is at the same distance from the light source, it is much smaller in the external space compared to the incident light intensity inside the room, and this effect depends on the angle of incidence of the illumination light on the transparent window. I understand that it doesn't depend. That is, it can be seen that the illumination light inside the room hardly leaks to the outside regardless of the incident angle of the illumination light with respect to the transparent window. In this state, when the inside of the room was observed with the naked eye from the outside space, the state inside the room was completely indistinguishable.

Further, when the exterior space was illuminated with the mercury lamp inside the room and the exterior space was visually inspected from the interior of the room, it was possible to identify the exterior condition without any problem although coloring occurred. It was Further, in this state, when the inside of the room was seen with the naked eye from the external space, the state inside the room was completely indistinguishable. Comparative Example 1 As shown in FIG. 13, in a room 7 having a width of 4 m, a depth of 4 m, and a height of 2.5 m, three sides of which are composed of white opaque walls 1 and the other side is in contact with an external space through a transparent window 2. An illumination lamp consisting of a fluorescent lamp 5 for general illumination surrounded by an optical interference filter 6 having wavelength selectivity was installed in the central portion.
Here, the transparent window 2 is 1500 nm having a structure in which a titanium dioxide film and a silicon dioxide film are alternately repeated on the glass plate 2A.
Is further coated with a 16-nm-thick metallic chromium film. The transparent window 2 has a spectral transmittance characteristic as shown in FIG. The fluorescent lamp 5 for general illumination has a spectral radiant flux distribution shown in FIG. The illumination light has a spectral radiant flux distribution as shown in FIG. 16 by the optical interference filter 6.

When the illumination of the incandescent lamp in the external space is turned off and the fluorescent lamp in the room is turned on, the wavelength distribution of the incident light intensity at the point A in the room at a distance of 2 m from the light source is measured and FIG. 17 shows the result of measuring the wavelength distribution of the incident light intensity at the point B in the external space at the same distance as this. From this, even though the distance from the light source is the same and the relationship with the wall surface is almost the same, that in the external space is extremely small compared to the incident light intensity inside the room, that is, It can be seen that almost no illumination light leaks to the outside. In this state, when the inside of the room was observed with the naked eye from the outside space, the state inside the room was completely indistinguishable.

On the other hand, when the illumination of the external space is turned on while the fluorescent lamp inside the room is turned on and the external space is visually observed from the inside of the room, it is slightly colored. Was possible without problems. Further, when the inside of the room was observed with the naked eye from the external space in this state, it was completely indistinguishable.

Illumination (effective luminous flux /
The total efficiency represented by (power consumption) was about 35 lm / W, which was 55% of the total efficiency 63 lm / W of the fluorescent lamp itself, which was very low. This is because part of the light emitted from the light source is not used as illumination light. Comparative Example 2 In Comparative Example 1, the visibility from inside and outside the room was examined in exactly the same manner except that the optical interference filter 7 was not provided around the light source 5. When the lighting of the incandescent lamp in the external space was turned off and the fluorescent lamp inside the room was turned on, when the inside of the room was visually inspected from the outside, the inside state of the room was clearly visible.

On the other hand, when the illumination of the external space is turned on while the fluorescent lamp inside the room is turned on and the external space is viewed with the naked eye from inside the room, it is slightly colored, and it is possible to identify the external state of the room, although it is slightly dark. Was possible without problems. In this state, when the inside of the room was observed with the naked eye from the external space, the person in the room could be visually recognized.

As described above, in the embodiment, it is possible to make the interior of the room invisible from the outside while maintaining the high illumination efficiency of the illumination in the room both during the day and at night.

[0044]

According to the present invention, since the inside cannot be visually recognized from the outside of the room both during the day and at night, the room can always have privacy. Moreover, the illumination lamp used illuminates the interior of the room with energy efficiency.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a room of the present invention.

FIG. 2 is a spectral radiant flux distribution of the illumination lamp used in Examples 1 and 2.

3 is a spectral transmittance characteristic of the transparent window used in Example 1. FIG.

FIG. 4 is a wavelength distribution of incident light intensity at points A and B in Example 1.

5 is a spectral transmittance characteristic of the transparent window used in Example 2. FIG.

6 is a wavelength distribution of incident light intensity at points A and B in Example 2. FIG.

7 is a spectral radiant flux distribution of the illumination lamp used in Example 3. FIG.

8 is a spectral transmittance characteristic of the transparent window used in Example 3. FIG.

9 is a wavelength distribution of incident light intensity in A and B of Example 3. FIG.

FIG. 10 is a spectral radiant flux distribution of the illumination lamp used in Example 4.

11 is a spectral transmittance characteristic of the transparent window used in Example 4. FIG.

FIG. 12 is a wavelength distribution of incident light intensity at points A and B in Example 4.

13 is a room of Comparative Example 1. FIG.

14 is a spectral transmittance characteristic of the transparent window used in Comparative Example 1. FIG.

15 is a spectral radiant flux distribution of the illumination lamp used in Comparative Example 1. FIG.

16 is a spectral radiant flux distribution of illumination light used in Comparative Example 1. FIG.

17 is a wavelength distribution of incident light intensity at points A and B in Comparative Example 1. FIG.

FIG. 18 is a cross-sectional view of another embodiment of the room of the present invention.

19 is a spectral transmittance characteristic of the transparent window used in Example 5. FIG.

20 is a wavelength distribution of incident light intensity at points A, B, and C in Example 5. FIG. .

21 is a spectral transmittance characteristic of the transparent window used in Example 6. FIG.

22 is a wavelength distribution of incident light intensity at points A, B, and C in Example 6. FIG.

23 is a spectral radiant flux characteristic of the illumination light used in Example 7. FIG.

24 is a spectral transmittance characteristic of the transparent window used in Example 7. FIG.

25 is a wavelength distribution of incident light intensity at points A, B, and C in Example 7. FIG.

FIG. 26 is a sectional view of a room according to another embodiment of the present invention.

27 is a wavelength distribution of incident light intensity at points A, B, and C in Example 8. FIG.

28 is a spectral radiant flux distribution of the illumination lamp used in Example 9. FIG.

29 is a spectral transmittance characteristic of the transparent window used in Example 9. FIG.

FIG. 30 is a wavelength distribution of incident light intensity at points A, B, and C of Example 9.

FIG. 31 is a diagram for explaining the behavior of light entering a transparent window.

[Explanation of symbols]

1 ... Opaque wall, 2 ... Transparent window, 3 ... Room of the present invention, 4 ... Illumination lamp according to the present invention, 5 ...
Prior art illumination lamp, 6 ... Wavelength selective optical interference filter, 7 ... Prior art room

Claims (3)

[Claims] 1. A room in which an illumination lamp is provided and a transparent window is provided in an opening, wherein a light source of the illumination lamp is a light emission band of at least one specific wavelength region consisting of a line spectrum and the specific wavelength. The transparent window having an emission spectrum mainly consisting of a continuous spectrum other than the region and having an emission energy of 40% or less of the total emission energy in the region other than the specific wavelength region is used. A room in which the visibility when viewing the inside of the room from the outside through the transparent window is reduced by making the light transmittance in the wavelength region lower than the light transmittance outside the specific wavelength region. 2. The light source of the illumination lamp is blue-violet,
The room according to claim 1, wherein the room is a three-wavelength band fluorescent lamp in which phosphors that emit light in the green and red wavelength ranges are combined. 3. The maximum value of the spectral radiant flux emitted through the transparent window of the illumination lamp is 5% or less of the maximum value of the spectral radiant flux incident on the transparent window of the illumination lamp,
The room according to claim 1 or 2, wherein the transparent window has a transmittance of 5% or more for light other than the specific wavelength region.