JP2018031136A - Luminous environment control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a luminous environment control system that enables the whole room interior to be in a balanced appropriate luminous environment.SOLUTION: A luminous environment control system 1 comprises: a luminance sensor 12 for detecting indoor window surface luminance and wall surface luminance; change parts 2, 3 and 4 for changing an indoor luminous environment; a storage part 40 for storing an appropriate luminance balance area in which a predetermined and desired relationship is established between the window surface luminance and the wall surface luminance; and a control part 30 for controlling the change parts 2, 3 and 4 so that the window surface luminance and the wall surface luminance are present in the appropriate luminance balance area.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a light environment control system that controls a light environment in a room.

  2. Description of the Related Art Conventionally, an optical environment control system that performs light control based on a sense of brightness in a room has been disclosed (see Patent Document 1).

JP 2013-168333 A

“Study on preferred brightness contrast between window surface and wall surface in daylight use, Part 4 Handling of window surface brightness in blind use”, Mika Kato, 4 others, Abstracts of Annual Conference of Architectural Institute of Japan, pp.563- 564, 2014 "Contrast effect and total amount effect of discomfort glare", Toshie Iwata, 2 others, Journal of the Architectural Institute of Japan, No.618, pp.1-7, August 2007

  However, the technique described in Patent Document 1 measures the luminance distribution of the window surface, wall surface, floor surface, and desk surface, and based on the measured values, blinds, ambient lighting that illuminates the wall surface, and task lighting are respectively used. Since the control is performed separately, each control has an influence and cannot maintain a proper light environment as a whole.

  An object of the present invention is to solve the above-mentioned problems and to provide a light environment control system that can control the entire room in a balanced and appropriate light environment.

The light environment control system according to the present invention includes:
A brightness sensor for detecting indoor window surface brightness and wall surface brightness;
A changing unit for changing the indoor light environment;
A storage unit for storing an appropriate luminance balance region in which the window surface luminance and the wall surface luminance have a predetermined desired relationship;
A control unit that controls the changing unit so that the window surface luminance and the wall surface luminance exist in the appropriate luminance balance region;
It is characterized by providing.

The light environment control system according to the present invention includes:
The changing unit includes a blind for adjusting the amount of solar radiation from the window surface,
The light environment control system according to claim 1, wherein the control unit controls an angle of the blind.

The light environment control system according to the present invention includes:
Further comprising a direct sunlight detection unit for obtaining a state of direct sunlight on the window surface,
The storage unit stores in advance a blind characteristic formula indicating a relationship between a sun profile angle and a blind angle corresponding to the profile angle and brightness,
The controller is configured to control the blind based on a blind characteristic equation corresponding to the profile angle when the direct sunlight is incident.

The light environment control system according to the present invention includes:
The changing unit includes lighting for illuminating the room,
The control unit controls a dimming rate of the illumination.

The light environment control system according to the present invention includes:
The appropriate luminance balance region is a region where the window surface luminance and the wall surface luminance are in predetermined desired ranges, respectively.

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

The light environment control system of this embodiment is shown. The image of the brightness sensor of the light environment control system of this embodiment is shown. An example of the relationship between a blind angle and the light transmittance is shown. The graph of the characteristic formula of the blind of this embodiment is shown. The appropriate luminance balance of 1st Embodiment used for the control part of the light environment control system of this embodiment is shown. The suitable brightness balance area | region of 1st Embodiment used for the control part of the light environment control system of this embodiment is shown. The control flowchart of 1st Embodiment used for the control part of the light environment control system of this embodiment is shown. The proper luminance balance of 2nd Embodiment used for the control part of the light environment control system of this embodiment is shown. The state which subdivided the area | region (5) of FIG. 8 is shown. The change of the window surface brightness average value and wall surface brightness average value with respect to control of the blind angle and illumination dimming rate used for the light environment control of 2nd Embodiment is shown. The control flowchart of 2nd Embodiment used for the control part of the light environment control system of this embodiment is shown. The subroutine of the blind and illumination control of the control flowchart of 2nd Embodiment is shown. The visual environment state by the relationship between the window surface luminance average value and wall surface luminance average value used for control of 2nd Embodiment is shown. The visual environment state by the relationship between the window surface average brightness value in the area | region (5) used for control of 2nd Embodiment and a wall surface brightness average value is shown.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a light environment control device, a light environment control system, and a light environment control method according to the present invention will be described with reference to the drawings.

  FIG. 1 shows a light environment control system 1 of the present embodiment.

  In the light environment control system 1 of the present embodiment, the blind 2 as the changing unit is suspended from the ceiling surface 52 toward the floor surface 53 adjacent to the inside of the window surface 51. The blind 2 can be manually or automatically changed in height 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 to the ceiling surface 52 side.

  The blind 2 has a plurality of slats 3 that also constitute the changing portion. Each of the plurality of slats 3 is formed such that the angle 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 refers to the angle of the uppermost slat 3, but the average angle of all the slats 3 may be the angle of the blind 2. Moreover, although the blind control system 1 of this embodiment is applied to the blind 2 attached indoors, it is applicable also to the external blind or the double skin internal blind installed between two glass.

  The illumination 4 as the changing unit is attached to the ceiling surface 52 side by side. It is preferable that the illumination 4 can adjust the light control rate. The illumination 4 may be ambient illumination or task illumination.

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

  As shown in FIG. 2, the luminance 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 this embodiment is a brightness camera, and measures the brightness of the room, particularly the brightness of the window surface 51 and the wall surface 54 around the window surface 51.

  The control unit 30 illustrated 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. Note that the blind control device 30 of the present embodiment can be applied to a general blind 2.

  The control unit 30 of the present embodiment uses the state of direct sunlight on the window surface acquired from the direct sunlight detection unit 11, and the window surface luminance average value and the wall surface luminance average value acquired from the luminance sensor 12 to blind Control at least one of the angle of 2 and the dimming rate of the illumination 4.

  The memory | storage part 40 shown in FIG. 1 memorize | stores the appropriate brightness | luminance balance area | region mentioned later from which a window surface brightness | luminance average value and a wall surface brightness | luminance average value become a predetermined desired relationship.

  Here, the relationship between the window surface luminance 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, the brightness of the room can be controlled by controlling the angle of the blind 2.

  The current window surface luminance average value is L1, and the target window surface luminance average value is L2. The relationship between the blind angle α and the light transmittance T is T = f (α), and the 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) of the blind angle α and the light transmittance T. The light transmittance T2 for setting the target window luminance L2 is obtained by multiplying the current light transmittance T1 by L2 / L1. Then, when the obtained T2 is substituted into the blind angle α and the inverse function α = g (T) of 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 can be obtained from a blind characteristic equation that varies 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 size or material of each slat 3.

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

  The blind characteristic equation 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, a characteristic equation is obtained from a solid line relationship that approximates a rhombus. Further, when the solar profile angle is 30 °, a characteristic equation is obtained from a broken line relationship approximating a square. Furthermore, when the solar profile angle is 40 °, the characteristic equation is obtained from the relationship of the one-dot chain line approximating the triangle. When the solar profile angle is 50 °, the characteristic equation is derived from the relationship of the two-dot chain line approximating the x mark. Ask.

  Next, the light 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 luminance average value and the wall surface luminance average value is controlled so as to approach a preset appropriate luminance 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 light environment control system of the present embodiment.

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

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

  Thus, since the blind 2 is controlled such that the window surface luminance average value and the wall surface luminance average value approach the appropriate luminance balance, it becomes possible to control the entire room to a balanced and appropriate light environment. Therefore, a person in the room can feel the light environment in the room comfortably.

  FIG. 6 shows an appropriate luminance balance region of the first embodiment used in the light environment control device of the light 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 surface luminance, and the appropriate luminance balance region C may be set. In this case, when the balance between the window surface luminance average value and the wall surface luminance average value is in a region B where the window surface luminance average value is lower than the appropriate luminance balance region C with respect to the predetermined wall surface luminance average value, FIG. The window surface brightness average value is increased as indicated by an arrow BC, and the blind 2 is opened so as to be within a predetermined appropriate brightness balance region C. Further, when the balance between the window surface luminance average value and the wall surface luminance average value is in the region B where the window surface luminance average value is lower than the appropriate luminance balance region C with respect to the predetermined wall surface luminance average value, an arrow shown in FIG. As in AC, the window surface brightness average value is lowered, and the blind 2 is closed so as to be within a predetermined appropriate brightness balance region.

  Thus, since the blind 2 is controlled so that the window surface luminance average value and the wall surface luminance average value are present in the appropriate luminance balance region, it becomes possible to control the entire room in a balanced and appropriate light environment. . Therefore, a person in the room can feel the light environment in the room comfortably.

  In the light environment control of the first embodiment, the 75% allowable wall surface luminance C1 is used as an index. However, the present invention is not limited to this, and another index may be used.

  FIG. 7 shows a control flowchart of the first embodiment used for the control unit 30 of the light 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 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 equation corresponding to the sun profile angle stored in advance is selected (ST2). Then, it progresses to step 4.

  If direct sunlight is not incident on the window surface in step 1, a blind characteristic formula is selected in step 3 when direct sunlight stored in advance is not incident (ST3). Then, it progresses to step 4.

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

  Next, in step 5, the average value of the window surface luminance and the wall surface luminance and the maximum value of the window surface luminance are calculated (ST5). The average value of the window surface luminance and the wall surface luminance is calculated by dividing the window surface luminance and the wall surface luminance read in Step 4 by the number of pixels 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 luminance is higher than a predetermined first value (ST6). Here, it is determined whether the window surface is too dazzling. The first value may be set to about 5000 candela, for example.

  In step 6, when the maximum value of the window surface brightness is higher than the predetermined first value, in step 7, using the blind characteristic equation, the angle at which the window surface brightness becomes the predetermined first value is Blind 2 is closed (ST7). Thereafter, the light environment control is terminated.

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

  In step 8, when the wall surface luminance average value with respect to the window surface luminance average value is lower than the predetermined appropriate luminance balance, in step 9, using the blind characteristic formula, the window surface luminance average value is increased to determine the predetermined appropriate value. The blind 2 is opened so as to approach the luminance balance (ST9). Thereafter, the light 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 lower than the predetermined appropriate brightness balance. Whether it is high is determined (ST10).

  In step 10, when the wall surface luminance average value with respect to the window surface luminance average value is higher than the predetermined appropriate luminance balance, the window surface luminance average value is lowered using the blind characteristic equation in step 11 to determine the predetermined appropriate The blind 2 is closed so as to approach the luminance balance (ST11). Thereafter, the light environment control is terminated.

  In Step 10, when the wall surface luminance average value with respect to the window surface luminance average value is not higher than the predetermined appropriate luminance balance, the light environment control is ended without opening and closing the blind 2.

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

  Next, the light environment control of 2nd Embodiment used for the control part 30 of the light environment control system 1 of this embodiment is demonstrated. The light environment control of the second embodiment controls the blind 2 and the illumination, and changes the balance between the window surface brightness average value and the wall surface brightness average value by changing the window surface brightness average value and the wall surface brightness average value. The balance between the window surface luminance average value and the wall surface luminance average value is controlled so as to approach a preset appropriate luminance balance.

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

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

  FIG. 10 shows changes in the window surface luminance average value and the wall surface luminance average value with respect to the control of the blind angle and the illumination dimming rate used in 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. The blind angle control greatly affects the window surface brightness, but also the wall surface brightness. The lighting dimming rate affects the wall surface brightness, but has little effect on the window surface brightness.

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

  Conversely, when the blind is opened from the closed state of B2 shown in FIG. 10 to the open state of B1, the window surface luminance average value increases and the wall surface luminance average value also increases. When the lighting dimming rate is increased from the dark state of L2 shown in FIG. 10 to the bright state of L1, the wall surface luminance average value increases, and the window surface luminance average value slightly increases.

In light of the influence of FIG. 10, in the light environment control of the second embodiment, control is performed based on the following basic policy.
a) The window surface brightness is adjusted by the blind angle.
b) The wall surface brightness is finely adjusted according to the lighting dimming rate.
c) In order to save energy, the illumination dimming rate is set to a setting illuminance or less as much as possible.
d) A mode with direct light and a mode without direct light are set according to the position of the sun stored in advance, the position of the sun calculated from the current time, and the window orientation.
e) The state of direct sunlight on the window surface acquired from the direct sunlight detection unit 11 is detected.

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

  First, in step 21, it is determined whether or not the present day is daytime (ST21). The determination of whether it is daytime is obtained by calculating from the position of the sun corresponding to the date stored in advance.

  If the current time is not daytime but night at step 21, the night mode is selected at step 22 (ST22). The following control can be considered in the night mode. (1) The brightness of the window surface is increased by closing the blinds in consideration of the brightness. (2) Open the blinds to secure the view. (3) To ensure brightness, the illumination is set to a predetermined condition. In addition, you may set not only these control but another control. Thereafter, the control is terminated.

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

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

  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 luminance average value and the wall surface luminance average value used in the control of the second embodiment.

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

  As shown in FIG. 13, when the window surface luminance average value is smaller than the predetermined allowable minimum value Lfl and the wall surface luminance average value is smaller than the predetermined allowable minimum value Lwl, the area where 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, blinds and lighting are controlled. (ST26). Blind and lighting control is divided into the four patterns shown in FIG.

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

  If the wall surface luminance average value Lw is equal to or smaller than the allowable minimum value Lwl in step 31, the illumination dimming rate is increased in step 32 (ST32). That is, the indoor lighting is brightened. For example, the state is changed from L2 to L1 in FIG. Thereafter, the process returns to step 31.

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

In step 41, when the wall surface luminance average value Lw is not less than the allowable maximum value Lwh, the illumination dimming rate is lowered in step 42 (ST42). That is, the indoor lighting is darkened. For example, the state is changed from L1 to L2 in FIG. Thereafter, the process returns to step 41.

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

  If the window surface luminance average value Lf is equal to or smaller than the allowable minimum value Lfl in step 51, the blind angle is increased in step 52 (ST52). That is, light is made brighter in the room. For example, the state is changed from B2 to B1 in FIG. Thereafter, the process returns to step 51.

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

  If the window surface luminance average value Lf is equal to or larger than the allowable maximum value Lfh in step 61, the blind angle is decreased in step 62 (ST62). That is, it is darkened without putting light in the room. For example, the state is changed from B1 to B2 in FIG. Thereafter, 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 the case where the illumination dimming rate is equal to or higher than the predetermined dimming rate, and B indicates the case where the illumination dimming rate is smaller than the predetermined dimming rate. L1 executes the control shown in FIG. 12A, L2 executes the control shown in FIG. 12B, B1 executes the control shown in FIG. 12C, and B2 executes the control shown in FIG. . The same applies to Table 2 below.

  For example, when the window surface luminance average value and the wall surface luminance average value are in the state of the region (3) in FIG. 13 and the illumination dimming rate is equal to or higher than a predetermined dimming rate, the region of Table 1 ( Execute control A in 3). That is, first, the illumination control shown in FIG. 12B is executed, and the illumination dimming rate of 80% is lowered to 60%. Since the illumination dimming rate is lowered, the wall surface luminance average value is mainly lowered. Subsequently, the blind control shown in FIG. 12C is executed to close the 20 ° blind angle to 40 °. Since the blind angle is on the closed side, the window surface luminance average value is mainly lowered. Then, as shown in FIG. 13, the window surface luminance average value and the wall surface luminance average value converge in the region (5). That is, control is performed so as to approach a preset appropriate luminance balance C2.

  When the window surface luminance average value and the wall surface luminance average value are in the state of the region (7) in FIG. 13, the control of the region (7) in Table 1 is executed. That is, first, the illumination control shown in FIG. 12A is executed, and the illumination dimming rate of 40% is increased to 60%. Since the illumination dimming rate is increased, the wall surface luminance average value is mainly increased. Subsequently, the blind control shown in FIG. 12D is executed, and the blind angle of 70 ° is opened to 60 °. Since the blind angle is on the open side, the window surface luminance average value is mainly increased. Then, as shown in FIG. 13, the window surface luminance average value and the wall surface luminance average value converge in the region (5). That is, control is performed so as to approach a preset appropriate luminance 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 luminance average value and the wall surface luminance average value exist in the appropriate luminance balance region. It becomes possible to control the light environment in a balanced and appropriate manner. Therefore, a person in the room can feel the light environment in the room comfortably.

  FIG. 14 shows a visual environment state based on the relationship between the window surface luminance average value and the wall surface luminance average value 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 region (5) -1 in FIG. 14, control of region (5) -1 in Table 1 is executed. That is, first, the blind control shown in FIG. 12C is executed to open the 80 ° blind angle to 40 °. Since the blind angle is on the open side, the window surface luminance average value is mainly increased. Subsequently, the illumination control shown in FIG. 12B is executed, and the illumination dimming rate of 80% is lowered to 45%. Since the illumination dimming rate is lowered, the wall surface luminance average value is mainly lowered. Then, as shown in FIG. 14, the window surface luminance average value and the wall surface luminance average value converge in the region (5) -5. That is, control is performed so as to approach a preset appropriate luminance balance C2.

  When the window surface brightness average value and the wall surface brightness average value are in the state of the region (5) -3 in FIG. 14, the control of the region (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 lowered to 45%. Since the illumination dimming rate is lowered, the wall surface luminance average value is mainly lowered. Then, as shown in FIG. 14, the window surface luminance average value and the wall surface luminance average value converge in the region (5) -6. That is, control is performed so as to approach a preset appropriate luminance 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 luminance average value and the wall surface luminance average value approach the appropriate luminance balance. It is possible to control the light environment so that it is appropriate. Therefore, a person in the room can feel the light environment in the room comfortably.

  Note that the appropriate luminance balance set in advance in the present embodiment is not limited to the 75% allowable wall surface luminance, and DGI, PGSV, DGP, or the like as a glare evaluation index may be used (see Non-Patent Document 2). In the case of using these evaluation indexes, the appropriate luminance balance may be determined by setting an index value that starts to feel uncomfortable as a threshold value.

  As described above, the light environment control system 1 according to the present embodiment includes the brightness sensor 12 that detects indoor window surface brightness and wall surface brightness, the blind 2 and the slat 3 or the illumination 4 that changes the indoor light environment, and the window surface brightness. The storage unit 40 stores an appropriate luminance balance region in which the wall surface luminance has a predetermined desired relationship, and controls the changing units 2, 3, and 4 so that the window surface luminance and the wall surface luminance exist in the appropriate luminance balance region. And a control unit 30. Therefore, it becomes possible to control the entire room in a balanced and appropriate light environment. Therefore, a person in the room can feel the light environment in the room comfortably.

  According to the light environment control system 1 of the present embodiment, the changing unit includes the blind 2 that adjusts 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 light environment control system 1 of the present embodiment, the appropriate luminance balance region satisfies the following expression (1).
_{log 10 (L wall) = 0.77log} 10 (L window) + 1.05log 10 ρ + 0.09 (1)
However,
L _wall : 75% allowable wall brightness,
L _window : Average brightness of window surface,
ρ: reflectivity of blind 2
It is.
Therefore, the entire room can be controlled to a more appropriate and appropriate light environment.

  According to the light environment control system 1 of the present embodiment, the light environment control system 1 further includes the direct sunlight detection unit 11 that acquires the state of the direct sunlight on the window surface 51, and the storage unit 40 is blind corresponding to the solar profile angle and the profile angle. The blind characteristic formula indicating the relationship between the angle 2 and the luminance 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, the entire room can be controlled to a more appropriate and appropriate light environment.

  According to the light environment control system 1 of the present embodiment, the changing unit includes the illumination 4 that illuminates the room, and the control unit 30 controls the dimming rate of the illumination 4. Therefore, the entire room can be controlled to a more appropriate and appropriate light environment.

  According to the light environment control system 1 of the present embodiment, the appropriate luminance balance region is a region in which the window surface luminance and the wall surface luminance are each in a predetermined desired range. Therefore, the entire room can be controlled to a more appropriate and appropriate light environment.

  In addition, this invention is not limited by this embodiment. That is, in describing the embodiment, many specific details are included for illustration, but those skilled in the art may add various variations and changes to these details.

DESCRIPTION OF SYMBOLS 1 ... Light environment control system, 2 ... Blind (change part), 3 ... Slat (change part), 4 ... Illumination (change part), 11 ... Direct sunlight detection part, 12 ... Luminance sensor, 30 ... Control part, 40 ... Storage part 51 ... Window surface 52 ... Ceiling surface 53 ... Floor surface 54 ... Wall surface

Claims (5)

A brightness sensor for detecting indoor window surface brightness and wall surface brightness;
A changing unit for changing the indoor light environment;
A storage unit for storing an appropriate luminance balance region in which the window surface luminance and the wall surface luminance have a predetermined desired relationship;
A control unit that controls the changing unit so that the window surface luminance and the wall surface luminance exist in the appropriate luminance balance region;
A light environment control system comprising: The changing unit includes a blind for adjusting the amount of solar radiation from the window surface,
The light environment control system according to claim 1, wherein the control unit controls an angle of the blind. Further comprising a direct sunlight detection unit for obtaining a state of direct sunlight on the window surface,
The storage unit stores in advance a blind characteristic formula indicating a relationship between a sun profile angle and a blind angle corresponding to the profile angle and brightness,
The light environment control system according to claim 2, wherein, when the direct sunlight is incident, the control unit controls the blind based on a blind characteristic equation corresponding to the profile angle. The changing unit includes lighting for illuminating the room,
The light environment control system according to claim 1, wherein the control unit controls a dimming rate of the illumination. The light environment control system according to claim 4, wherein the appropriate luminance balance region is a region in which the window surface luminance and the wall surface luminance are each in a predetermined desired range.

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