JP6804732B2 - Optical environment control system - Google Patents

Description

The present invention relates to a light environment control system that controls an indoor light environment.

Conventionally, an optical environment control system that adjusts light based on a feeling of brightness in a room has been disclosed (see Patent Document 1).

Japanese Unexamined Patent Publication No. 2013-168333

"Study on Preferred Brightness Contrast of Window and Wall in Daylight Use Part 4 Handling of Window Brightness in Blind Use", Mika Kato, 4 outsiders, Architectural Institute of Japan Conference Academic Lecture Abstracts, pp.563- 564, 2014 "Contrast effect and total amount effect of unpleasant glare", Toshie Iwata, 2 outsiders, Architectural Institute of Japan Environmental Papers, No. 618, pp.1-7, August 2007

However, the technique described in Patent Document 1 measures the brightness distribution of the window surface, the wall surface, the floor surface, and the desk surface, and based on the measured values, blinds, ambient lighting that illuminates the wall surface, and task lighting, respectively. Since they are controlled separately, each control affects each other, and it is not possible to maintain an appropriate lighting environment as a whole.

An object of the present invention is to solve the above problems and to provide a light environment control system capable of controlling the entire room to a well-balanced and appropriate light environment.

The optical environment control system according to the present invention is
A brightness sensor that detects the brightness of windows and walls in a room,
The change part that changes the light environment in the room,
A storage unit that stores an appropriate brightness balance region in which the window surface brightness and the wall surface brightness have a predetermined desired relationship.
A control unit that controls the change unit so that the window surface brightness and the wall surface brightness exist in the appropriate brightness balance region.
It is characterized by having.

The optical environment control system according to the present invention is
The modification includes a blind that adjusts the amount of solar radiation from the window surface.
The optical environment control system according to claim 1, wherein the control unit controls the angle of the blind.

The optical environment control system according to the present invention is
Further equipped with a direct sunlight detection unit that acquires the state of direct sunlight on the window surface,
The storage unit stores in advance a profile angle of the sun and a blind characteristic formula showing the relationship between the angle of the blind corresponding to the profile angle and the brightness.
The control unit is characterized in that when the direct sunlight is incident, the control unit controls the blind based on the blind characteristic formula corresponding to the profile angle.

The optical environment control system according to the present invention is
The modification includes lighting that illuminates the room.
The control unit is characterized in that it controls the dimming rate of the illumination.

The optical environment control system according to the present invention is
The appropriate brightness balance region is characterized in that the window surface brightness and the wall surface brightness are each in a predetermined desired range.

According to the light environment control system of one embodiment according to the present invention, it is possible to control the entire room into a well-balanced and appropriate light environment.

The optical environment control system of this embodiment is shown. The image of the luminance sensor of the optical environment control system of this embodiment is shown. An example of the relationship between the blind angle and the light transmittance is shown. The graph of the characteristic expression of the blind of this embodiment is shown. The appropriate luminance balance of the first embodiment used for the control unit of the optical environment control system of the present embodiment is shown. The appropriate luminance balance region of the first embodiment used for the control unit of the optical environment control system of the present embodiment is shown. The control flowchart of the first embodiment used for the control part of the optical environment control system of this embodiment is shown. The appropriate brightness balance of the second embodiment used for the control unit of the optical environment control system of the present embodiment is shown. The state where the region (5) of FIG. 8 is subdivided is shown. The changes in the window surface brightness average value and the wall surface brightness average value with respect to the control of the blind angle and the illumination dimming rate used for the light environment control of the second embodiment are shown. The control flowchart of the second embodiment used for the control part of the optical environment control system of this embodiment is shown. A subroutine of blind / lighting control of the control flowchart of the second embodiment is shown. The visual environment state based on the relationship between the window surface brightness average value and the wall surface brightness average value used for the control of the second embodiment is shown. The visual environment state based on the relationship between the average value of the window surface brightness and the average value of the wall surface brightness in the region (5) used for the control of the second embodiment is shown.

Hereinafter, an embodiment of the optical environment control device, the optical environment control system, and the optical environment control method according to the present invention will be described with reference to the drawings.

FIG. 1 shows the optical environment control system 1 of the present embodiment.

In the optical environment control system 1 of the present embodiment, the blind 2 as a change portion is suspended from the ceiling surface 52 toward the floor surface 53 adjacent to the inside of the window surface 51. The height of the blind 2 can be changed manually or automatically according to the situation, that is, the distance from the ceiling surface 52 at the lower end of the blind 2. Further, when not in use, all the blinds 2 can be pulled up toward the ceiling surface 52.

The blind 2 has a plurality of slats 3 that also constitute the change portion. The angles of the plurality of slats 3 can be changed. In the present embodiment, the amount of solar radiation from the window surface is adjusted by changing the angle of the blind 2, that is, the angle of the slat 3. In the present embodiment, the angle of the blind 2 is the angle of the slat 3 at the uppermost position, but the average angle of all the slat 3 may be the angle of the blind 2. Further, although the blind control system 1 of the present embodiment is applied to the blind 2 installed in the room, it can also be applied to the external blind or the blind in the double skin installed between the two pieces of glass.

The lighting 4 as a change portion is mounted side by side on the ceiling surface 52. It is preferable that the dimming rate of the illumination 4 can be adjusted. The lighting 4 may be ambient lighting or task lighting.

FIG. 2 shows an image of the luminance sensor 12 of the optical environment control system 1 of the present embodiment.

As shown in FIG. 2, the brightness sensor 12 is set so that the window surface 51 and the wall surface 54 around the window surface 51 are within the measurement range. The brightness sensor 12 of the present embodiment is a brightness camera, and measures the brightness in the room, particularly the brightness of the window surface 51 and the wall surface 54 around the window surface 51.

The control unit 30 shown in FIG. 1 is a device that controls at least one of the angle of the blind 2 and the dimming rate of the illumination 4. The blind control device 30 of this embodiment can be applied to a general blind 2.

The control unit 30 of the present embodiment blinds using the state of direct sunlight on the window surface acquired from the direct sunlight detection unit 11 and the window surface brightness average value and the wall surface brightness average value acquired from the brightness sensor 12. At least one of the angle 2 and the dimming rate of the illumination 4 is controlled.

The storage unit 40 shown in FIG. 1 stores an appropriate brightness balance region, which will be described later, in which the window surface brightness average value and the wall surface brightness average value have a predetermined desired relationship.

Here, the relationship between the window brightness and the blind angle will be described.

FIG. 3 shows an example of the relationship between the blind angle and the light transmittance.

The light environment control system 1 shown in FIG. 1 can change the light transmittance by controlling the angle of the blind 2. Therefore, it is possible to control the brightness of the room by controlling the angle of the blind 2.

Let L1 be the current average window brightness and L2 be the target average window brightness. The relationship between the blind angle α and the light transmittance T is T = f (α), and its inverse function is α = g (T). The current light transmittance T1 is calculated from the current blind angle α1 and the relational expression T = f (α) between the blind angle α and the light transmittance T. The light transmittance T2 for achieving the target window brightness L2 is obtained by multiplying the current light transmittance T1 by L2 / L1. Then, by substituting the obtained T2 into the inverse function α = g (T) of the blind angle α and the light transmittance T, the target blind angle α2 is obtained.

The relational expression T = f (α) between the blind angle α and the light transmittance T is obtained from the blind characteristic expression that changes depending on the width and reflectance of the slat 3 of the blind 2. That is, the blind characteristic formula is different for each blind 2, and is obtained from the dimensions or materials of each slat 3.

FIG. 4 shows a graph of the characteristic formula of the blind 2 of the present embodiment.

The blind characteristic formula is obtained by obtaining the relationship between the blind angle α and the light transmittance T for each profile angle of the sun shown in FIG.

For example, in the blind 2 of the present embodiment, as shown in FIG. 4, when there is no direct sunlight, the characteristic formula is obtained from the relationship of the solid line that approximates the rhombus. When the profile angle of the sun is 30 °, the characteristic formula is obtained from the relationship of the broken line that approximates the square. Furthermore, when the profile angle of the sun is 40 °, the characteristic formula is obtained from the relationship of the alternate long and short dash line that approximates the triangle, and when the profile angle of the sun is 50 °, the characteristic formula is obtained from the relationship of the alternate long and short dash line that approximates the x mark. Ask.

Next, the optical environment control of the first embodiment will be described. The light environment control of the first embodiment changes the balance between the window surface brightness average value and the wall surface brightness average value by controlling the blind 2 and changing the window surface brightness average value. The balance between the window surface brightness average value and the wall surface brightness average value is controlled so as to approach a preset appropriate brightness balance.

Here, the proper luminance balance will be described.

FIG. 5 shows an appropriate luminance balance of the first embodiment used for the control unit 30 of the optical environment control system of the present embodiment.

The appropriate brightness balance is a formula set in consideration of the balance between the average value of the window surface brightness and the average value of the wall surface brightness, and is preferably a balance that the person in the room feels comfortable with. For the appropriate brightness balance C1, for example, an index such as the following 75% allowable wall surface brightness described in Non-Patent Document 1 may be used.
log ₁₀ (L _wall ) = 0.77log ₁₀ (L _window ) +1.05 log ₁₀ ρ + 0.09 (1)
However,
L _wall : 75% allowable wall brightness,
L _window : Average window brightness,
ρ: Reflectance of the blind,
Is.

For example, when the balance between the window surface brightness average value and the wall surface brightness average value is in the region B where the window surface brightness average value is lower than the allowable wall surface brightness of 75% with respect to the predetermined wall surface brightness average value, the arrow shown in FIG. As in BC1, the average value of window brightness is increased, and the blind 2 is opened so that the allowable wall brightness is 75%. Further, when the balance between the window surface brightness average value and the wall surface brightness average value is in the region A in which the window surface brightness average value is higher than the allowable wall surface brightness of 75% with respect to the predetermined wall surface brightness average value, the arrow shown in FIG. As in AC1, the average window brightness is lowered, and the blind 2 is closed so that the allowable wall brightness is 75%.

In this way, since the blind 2 is controlled so that the average value of the window surface brightness and the average value of the wall surface brightness approach the appropriate brightness balance, it is possible to control the entire room into a well-balanced and appropriate lighting environment. Therefore, a person living in the room can comfortably feel the light environment in the room.

FIG. 6 shows an appropriate luminance balance region of the first embodiment used in the optical environment control device of the optical environment control system of the present embodiment.

For example, as shown in FIG. 6, a predetermined allowable range may be provided for the 75% allowable wall brightness, and the appropriate brightness balance region C may be set. In this case, when the balance between the window surface brightness average value and the wall surface brightness average value is in the area B where the window surface brightness average value is lower than the appropriate brightness balance area C with respect to the predetermined wall surface brightness average value, it is shown in FIG. The average value of the window surface brightness is increased as shown by the arrow BC, and the blind 2 is opened so as to be within the predetermined appropriate brightness balance region C. Further, when the balance between the window surface brightness average value and the wall surface brightness average value is in the area B in which the window surface brightness average value is lower than the appropriate brightness balance area C with respect to the predetermined wall surface brightness average value, the arrow shown in FIG. The average value of the window surface brightness is lowered as in AC, and the blind 2 is closed so as to be within a predetermined appropriate brightness balance region.

In this way, since the blind 2 is controlled so that the average value of the window surface brightness and the average value of the wall surface brightness exist in the appropriate brightness balance region, it is possible to control the entire room in a well-balanced and appropriate lighting environment. .. Therefore, a person living in the room can comfortably feel the light environment in the room.

In the optical environment control of the first embodiment, the 75% allowable wall surface brightness C1 is used as an index, but the present invention is not limited to this, and other indexes may be used.

FIG. 7 shows a control flowchart of the first embodiment used for the control unit 30 of the optical environment control system 1 of the present embodiment.

The light environment control of the first embodiment controls the angle of the blind 2. First, in step 1, it is determined whether or not direct sunlight is incident on the window surface (ST1).

In step 1, when direct sunlight is incident on the window surface, in step 2, a blind characteristic formula corresponding to the profile angle of the sun stored in advance is selected (ST2). Then, the process proceeds to step 4.

In step 1, when the window surface is not exposed to direct sunlight, in step 3, the blind characteristic formula stored in advance when no direct sunlight is incident is selected (ST3). Then, the process proceeds to step 4.

Then, in step 4, the luminance file is read (ST4). Reading the brightness file is to temporarily store the distribution of the window surface brightness and the wall surface brightness from the image of the brightness sensor 12 shown in FIG.

Next, in step 5, the average value of the window surface brightness and the wall surface brightness and the maximum value of the window surface brightness are calculated (ST5). The average value of the window surface brightness and the wall surface brightness is calculated by dividing the window surface brightness and the wall surface brightness read in step 4 by the number of pixels of each of the window surface and the wall surface.

Subsequently, in step 6, it is determined whether or not the maximum value of the window surface brightness is higher than the predetermined first value (ST6). Here, it is determined whether or not the window surface is too dazzling. The first value may be set to, for example, about 5000 candelas.

In step 6, when the maximum value of the window surface brightness is higher than the predetermined first value, in step 7, the blind characteristic formula is used to set the angle at which the window surface brightness becomes the predetermined first value. Close the blind 2 (ST7). After that, the optical environment control is terminated.

If the maximum value of the window surface brightness is lower than the predetermined first value in step 6, whether or not the wall surface brightness average value with respect to the window surface brightness average value is lower than the predetermined appropriate brightness balance in step 8. Is determined (ST8).

In step 8, when the wall surface brightness average value with respect to the window surface brightness average value is lower than the predetermined appropriate brightness balance, in step 9, the window surface brightness average value is increased by using the blind characteristic formula to determine the predetermined appropriateness. Open the blind 2 so as to approach the brightness balance (ST9). After that, the optical environment control is terminated.

In step 8, when the wall surface brightness average value with respect to the window surface brightness average value is not lower than the predetermined appropriate brightness balance, in step 10, the wall surface brightness average value with respect to the window surface brightness average value is larger than the predetermined appropriate brightness balance. It is determined whether or not it is high (ST10).

In step 10, when the wall surface brightness average value with respect to the window surface brightness average value is higher than the predetermined appropriate brightness balance, in step 11, the window surface brightness average value is lowered by using the blind characteristic formula, and the predetermined appropriateness is determined. The blind 2 is closed so as to approach the brightness balance (ST11). After that, the optical environment control is terminated.

In step 10, if the wall brightness average value with respect to the window surface brightness average value is not higher than the predetermined appropriate brightness balance, the blind 2 is not opened and closed, and the light environment control is terminated as it is.

As described above, according to the light environment control of the first embodiment, the blind 2 is controlled so that the window surface brightness average value and the wall surface brightness average value exist in the appropriate brightness balance region, so that the entire room is balanced. It is possible to control to an appropriate light environment. Therefore, a person living in the room can comfortably feel the light environment in the room.

Next, the optical environment control of the second embodiment used for the control unit 30 of the optical environment control system 1 of the present embodiment will be described. The light environment control of the second embodiment changes the balance between the window surface brightness average value and the wall surface brightness average value by controlling the blind 2 and the lighting and changing the window surface brightness average value and the wall surface brightness average value. The balance between the window surface brightness average value and the wall surface brightness average value is controlled so as to approach a preset appropriate brightness balance.

FIG. 8 shows an appropriate luminance balance of the second embodiment used in the optical environment control device of the optical environment control system of the present embodiment. FIG. 9 shows a state in which the region (5) of FIG. 8 is subdivided.

In the light environment control of the second embodiment, as shown in FIG. 8, the relationship between the window surface brightness average value and the wall surface brightness average value is divided into nine regions (1) to (9). The preset appropriate luminance balance region C is the region (5). In the region (5), as shown in FIG. 9, the relationship between the window surface brightness average value and the wall surface brightness average value is further divided into nine regions. The preset appropriate brightness balance C2 is arranged in the area (5) -4, the area (5) -5, and the area (5) -6.

FIG. 10 shows changes in the window surface brightness average value and the wall surface brightness average value with respect to the control of the blind angle and the illumination dimming rate used for the light environment control of the second embodiment.

In the light environment control of the second embodiment, the blind angle and the illumination dimming rate are controlled. Controlling the blind angle has a great effect on the brightness of the window surface, but it also affects the brightness of the wall surface. The illumination dimming rate affects the wall brightness, but has almost no effect on the window brightness.

For example, when the blind is closed from the open state of B1 to the closed state of B2 shown in FIG. 10, the average value of window surface brightness becomes low and the average value of wall surface brightness also becomes low. When the illumination dimming rate is lowered from the bright state of L1 to the dark state of L2 shown in FIG. 10, the wall brightness average value becomes low, and the window surface brightness average value becomes slightly low.

On the contrary, when the blind is opened from the closed state of B2 to the open state of B1 shown in FIG. 10, the average value of window surface brightness becomes high and the average value of wall surface brightness also becomes high. When the illumination dimming rate is increased from the dark state of L2 to the bright state of L1 shown in FIG. 10, the wall brightness average value becomes high and the window surface brightness average value becomes slightly high.

Based on the influence of FIG. 10, in the optical environment control of the second embodiment, the control is performed based on the following basic policy.
a) The window brightness is adjusted by the blind angle.
b) The wall brightness is finely adjusted according to the illumination dimming rate.
c) The illumination dimming rate should be as low as possible below the set illuminance in order to save energy.
d) Set a mode with direct light and a mode without direct light according to the position of the sun stored in advance, the position of the sun calculated from the current time, and the direction of the window surface.
e) Detects the state of direct sunlight on the window surface acquired from the direct sunlight detection unit 11.

FIG. 11 shows a control flowchart of the second embodiment used for the control unit 30 of the optical environment control system 1 of the present embodiment. FIG. 12 shows a subroutine for blind / lighting control in the control flowchart of the second embodiment.

First, in step 21, it is determined whether or not the present is daytime (ST21). Whether it is daytime or not is calculated from the position of the sun corresponding to the date stored in advance.

In step 21, if the present is night instead of daytime, step 22 selects the night mode (ST22). The night mode can be controlled as follows. (1) Increase the brightness of the window surface by closing the blinds in consideration of the feeling of brightness. (2) Open the blinds to secure the view. (3) Lighting is set to predetermined conditions to ensure brightness. In addition to these controls, other controls may be set. After that, the control is terminated.

Subsequently, in step 23, the window surface brightness average value and the wall surface brightness average value are calculated, respectively (ST23). The window surface brightness average value and the wall surface brightness average value are calculated from the brightness camera 11 in the same manner as in the first embodiment.

Subsequently, in step 24, the visual environment state is applied to a predetermined region (ST24). The visual environment state is determined by the ratio of the average value of window surface brightness and the average value of wall surface brightness.

Subsequently, in step 25, the blind angle and the illumination dimming rate are detected. (ST25). The blind angle is 0 ° (horizontal) when fully open and 90 ° when fully closed.

FIG. 13 shows a visual environment state based on the relationship between the window surface brightness average value and the wall surface brightness average value used for the control of the second embodiment.

For example, as shown in FIG. 13, when the average value of window surface brightness is larger than the predetermined maximum allowable value Lfh and the average value of wall surface brightness is larger than the predetermined maximum allowable value Lwh, the entire room feels dazzling. It is pointed to (3). The blind angle detected at that time is 20 °, and the illumination dimming rate is 80%.

Further, as shown in FIG. 13, when the average value of window surface brightness is smaller than the predetermined minimum allowable value Lfl and the average value of wall surface brightness is smaller than the predetermined minimum allowable value Lwl, the entire room feels dark. Pointed to (7). The blind angle detected at that time is 20 °, and the illumination dimming rate is 40%.

Subsequently, in step 26, the blinds and lighting are controlled. (ST26). Blind and lighting controls are divided into the four patterns shown in FIG.

FIG. 12A shows a control for increasing the illumination dimming rate. First, in step 31, it is determined whether or not the wall brightness average value Lw is larger than the allowable minimum value Lwl (ST31). In step 31, when the wall brightness average value Lw is larger than the allowable minimum value Lwl, the control is terminated.

In step 31, when the wall brightness average value Lw is equal to or less than the allowable minimum value Lwl, the illumination dimming rate is increased in step 32 (ST32). That is, the lighting in the room is brightened. For example, the state from L2 to L1 in FIG. 10 is set. Then, the process returns to step 31.

FIG. 12B shows a control for lowering the illumination dimming rate. First, in step 41, it is determined whether or not the wall brightness average value Lw is smaller than the allowable maximum value Lwh (ST41). In step 41, when the wall brightness average value Lw is smaller than the allowable maximum value Lwh, the control is terminated.

In step 41, when the average wall brightness Lw is equal to or greater than the maximum allowable value Lwh, the illumination dimming rate is lowered in step 42 (ST42). That is, the lighting in the room is dimmed. For example, the state from L1 to L2 in FIG. 10 is set. Then, the process returns to step 41.

FIG. 12C shows a control for increasing the blind angle. First, in step 51, it is determined whether or not the window surface brightness average value Lf is larger than the allowable minimum value Lfl (ST51). In step 51, when the window surface brightness average value Lf is larger than the allowable minimum value Lfl, the control is terminated.

In step 51, when the window surface brightness average value Lf is equal to or less than the allowable minimum value Lfl, the blind angle is increased in step 52 (ST52). That is, light is put into the room to make it brighter. For example, the state from B2 to B1 in FIG. 10 is set. Then, the process returns to step 51.

FIG. 12D shows a control for reducing the blind angle. First, in step 61, it is determined whether or not the window surface brightness average value Lf is smaller than the allowable maximum value Lfh (ST61). In step 61, when the window surface brightness average value Lf is smaller than the allowable maximum value Lfh, the control is terminated.

In step 61, when the average window brightness Lf is equal to or greater than the maximum allowable value Lfh, the blind angle is reduced in step 62 (ST62). That is, it is darkened without letting light into the room. For example, the states B1 to B2 in FIG. 10 are set. Then, the process returns to step 61.

Table 1 below shows a control method from a state other than the region (5) shown in FIG.

Here, A indicates a case where the illumination dimming rate is equal to or higher than a predetermined dimming rate, and B indicates a case where the illumination dimming rate is smaller than a predetermined dimming rate. Further, L1 executes the control shown in FIG. 12 (a), L2 executes the control shown in FIG. 12 (b), B1 executes the control shown in FIG. 12 (c), and B2 executes the control shown in FIG. 12 (d). .. The same applies to Table 2 below.

For example, when the average value of window surface brightness and the average value of wall surface brightness are in the state of the region (3) in FIG. Execute the control of A in 3). That is, first, the illumination control shown in FIG. 12B is executed, and the illumination dimming rate of 80% is reduced to 60%. Since the illumination dimming rate is lowered, the average wall brightness is mainly lowered. Subsequently, the blind control shown in FIG. 12 (c) is executed, and the blind angle of 20 ° is closed to 40 °. Since the blind angle is set to the closed side, the average value of window brightness is mainly low. Then, as shown in FIG. 13, the window surface brightness average value and the wall surface brightness average value converge within the region (5). That is, it is controlled so as to approach the preset appropriate brightness balance C2.

Further, when the window surface brightness average value and the wall surface brightness average value are in the state of the area (7) in FIG. 13, the control of the area (7) in Table 1 is executed. That is, first, the lighting control shown in FIG. 12A is executed to raise the lighting dimming rate of 40% to 60%. Since the illumination dimming rate is increased, the average wall brightness is mainly increased. Subsequently, the blind control shown in FIG. 12 (d) is executed, and the blind angle of 70 ° is opened to 60 °. Since the blind angle is set to the open side, the average value of window brightness is mainly high. Then, as shown in FIG. 13, the window surface brightness average value and the wall surface brightness average value converge within the region (5). That is, it is controlled so as to approach the preset appropriate brightness balance C2.

As described above, according to the light environment control of the second embodiment, the blind 2 and the illumination 4 are controlled so that the window surface brightness average value and the wall surface brightness average value exist in the appropriate brightness balance region, so that the entire room can be further affected. It is possible to control the lighting environment in a well-balanced and appropriate manner. Therefore, a person living in the room can comfortably feel the light environment in the room.

FIG. 14 shows a visual environment state based on the relationship between the average value of the window surface brightness and the average value of the wall surface brightness in the region (5) used for the control of the second embodiment.

Table 2 below shows the control method in the state of the region (5) shown in FIG.

For example, when the window surface brightness average value and the wall surface brightness average value are in the state of the area (5) -1 in FIG. 14, the control of the area (5) -1 in Table 1 is executed. That is, first, the control of the blind shown in FIG. 12C is executed, and the blind angle of 80 ° is opened to 40 °. Since the blind angle is set to the open side, the average value of window brightness is mainly high. Subsequently, the illumination control shown in FIG. 12B is executed to reduce the illumination dimming rate of 80% to 45%. Since the illumination dimming rate is lowered, the average wall brightness is mainly lowered. Then, as shown in FIG. 14, the window surface brightness average value and the wall surface brightness average value converge within the region (5) -5. That is, it is controlled so as to approach the preset appropriate brightness balance C2.

Further, when the window surface brightness average value and the wall surface brightness average value are in the state of the area (5) -3 in FIG. 14, the control of the area (5) -3 in Table 2 is executed. That is, the illumination control shown in FIG. 12B is executed, and the illumination dimming rate of 80% is reduced to 45%. Since the illumination dimming rate is lowered, the average wall brightness is mainly lowered. Then, as shown in FIG. 14, the window surface brightness average value and the wall surface brightness average value converge within the region (5) -6. That is, it is controlled so as to approach the preset appropriate brightness balance C2.

As described above, according to the light environment control of the second embodiment, the blind 2 and the illumination 4 are controlled so that the average value of the window surface brightness and the average value of the wall surface brightness approach the appropriate brightness balance, so that the entire room is further balanced. It is possible to control to a proper lighting environment. Therefore, a person living in the room can comfortably feel the light environment in the room.

The appropriate brightness balance preset in the present embodiment is not limited to the 75% allowable wall surface brightness, and DGI, PGSV, DGP, etc. as glare evaluation indexes may be used (see Non-Patent Document 2). For the appropriate brightness balance when these evaluation indexes are used, the index value at which each person begins to feel uncomfortable may be set as a threshold value.

As described above, the light environment control system 1 of the present embodiment includes a brightness sensor 12 that detects the indoor window surface brightness and the wall surface brightness, a blind 2 and slats 3 that change the indoor light environment, or an illumination 4, and a window surface brightness. The storage unit 40 stores an appropriate brightness balance area in which the wall brightness and the wall surface brightness have a predetermined desired relationship, and the change units 2, 3 and 4 are controlled so that the window surface brightness and the wall surface brightness exist in the appropriate brightness balance area. It includes a control unit 30. Therefore, it is possible to control the entire room to a well-balanced and appropriate light environment. Therefore, a person living in the room can comfortably feel the light environment in the room.

According to the light environment control system 1 of the present embodiment, the changing unit includes a blind 2 for adjusting the amount of solar radiation from the window surface 51, and the control unit 30 controls the angle of the blind 2. Therefore, the system can be formed with a simple structure.

According to the optical environment control system 1 of the present embodiment, the appropriate luminance balance region satisfies the following equation (1).
log ₁₀ (L _wall ) = 0.77log ₁₀ (L _window ) +1.05 log ₁₀ ρ + 0.09 (1)
However,
L _wall : 75% allowable wall brightness,
L _window : Average window brightness,
ρ: Reflectance of blind 2,
Is.
Therefore, it is possible to control the entire room to a more balanced and appropriate lighting environment.

According to the light environment control system 1 of the present embodiment, the direct sunlight detection unit 11 for acquiring the state of direct sunlight on the window surface 51 is further provided, and the storage unit 40 is a blind corresponding to the profile angle and the profile angle of the sun. A blind characteristic formula showing the relationship between the angle of 2 and the brightness is stored in advance, and the control unit 30 controls the blind 2 based on the blind characteristic formula corresponding to the profile angle when direct sunlight is incident. Therefore, it is possible to control the entire room to a more balanced and appropriate lighting environment.

According to the light environment control system 1 of the present embodiment, the changing unit includes the lighting 4 that illuminates the room, and the control unit 30 controls the dimming rate of the lighting 4. Therefore, it is possible to control the entire room to a more balanced and appropriate lighting environment.

According to the optical environment control system 1 of the present embodiment, the appropriate brightness balance region is a region in which the window surface brightness and the wall surface brightness are each in predetermined desired ranges. Therefore, it is possible to control the entire room to a more balanced and appropriate lighting environment.

The present invention is not limited to this embodiment. That is, in the description of the embodiment, many specific detailed contents are included for illustration purposes, but those skilled in the art may make various variations and changes to these detailed contents.

1 ... Light environment control system, 2 ... Blind (changed part), 3 ... Slat (changed part), 4 ... Lighting (changed part), 11 ... Direct sunlight detection part, 12 ... Brightness sensor, 30 ... Control part, 40 ... Storage unit, 51 ... window surface, 52 ... ceiling surface, 53 ... floor surface, 54 ... wall surface

Claims (5)

A brightness sensor that detects the brightness of windows and walls in a room,
The change part that changes the light environment in the room,
A storage unit that stores an appropriate brightness balance region in which the window surface brightness and the wall surface brightness have a predetermined desired relationship.
A control unit that controls the change unit so that the window surface brightness and the wall surface brightness exist in the appropriate brightness balance region.
An optical environment control system characterized by being equipped with. The modification includes a blind that adjusts the amount of solar radiation from the window surface.
The optical environment control system according to claim 1, wherein the control unit controls the angle of the blind. Further equipped with a direct sunlight detection unit that acquires the state of direct sunlight on the window surface,
The storage unit stores in advance a profile angle of the sun and a blind characteristic formula showing the relationship between the angle of the blind corresponding to the profile angle and the brightness.
The light environment control system according to claim 2, wherein the control unit controls the blind based on a blind characteristic formula corresponding to the profile angle when the direct sunlight is incident on the control unit. The modification includes lighting that illuminates the room.
The optical environment control system according to any one of claims 1 to 3, wherein the control unit controls the dimming rate of the lighting. The optical environment control system according to claim 4, wherein the appropriate brightness balance region is a region in which the window surface brightness and the wall surface brightness are each in a predetermined desired range.

Images