JP6154100B2 - Light environment control method and light environment control system - Google Patents

Description

  The present invention relates to a light environment control method and a light environment control system. More particularly, the present invention relates to control of the light environment in an indoor space including daylight.

  Conventionally, in order to reduce energy consumption of illumination, correction control of initial illuminance for suppressing unnecessary brightness of illumination immediately after lamp replacement has been performed. There is also known a dimming system that automatically adjusts the output of a lighting fixture based on the illuminance on the floor surface of the indoor space where daylight enters and the desk surface. That is, in general, an index for evaluating brightness in the related art is a value of illuminance (unit: lux).

  However, there is a case where it is not possible to feel an appropriate brightness with the method of dimming only based on the illuminance value. That is, although a required illuminance value is ensured, it may be felt in a dark space, which may cause a complaint. Moreover, if useless illumination is used to obtain a feeling of brightness, it is contrary to energy saving. Specifically, in an office with one-side lighting, if lighting output control is performed based on the illumination on the desk surface, the lighting near the window is dimmed, and the brightness of the window and the brightness of the desk surface are reduced. Since it is very different, it tends to cause a lack of brightness.

  Further, in a technique such as PGSV (predicted glare sensation vote), the blind opening is controlled based on the average luminance of the blind surface (window surface). However, glare perceived by humans varies depending on the luminance distribution. For this reason, it is not possible to correctly evaluate the dazzle feeling without considering the luminance distribution.

  The present invention has been made in view of the above-described problems, and provides a light environment control method and a light environment control system capable of efficiently ensuring an appropriate brightness feeling in an indoor space including daylight. With the goal.

In order to solve the above problems, in a first aspect of the present invention, in a light environment control method for controlling a light environment of an indoor space including daylight,
A distribution acquisition step of measuring a luminance distribution in each predetermined region for a plurality of predetermined regions in the indoor space, and obtaining a distribution of brightness index values in each predetermined region from the measured luminance distribution;
Change to change the brightness feeling of each predetermined area so that the distribution range of the brightness index value in each predetermined area falls within the target range of the brightness index value set according to each predetermined area and the dimming control step of controlling the dimming means only including,
In the dimming control step, the light environment control method is characterized in that the target range is changed as time passes .

In the second embodiment of the present invention, in the light environment control system for controlling the light environment of the indoor space including daylight,
A luminance distribution measuring unit that measures the luminance distribution in each predetermined region for a plurality of predetermined regions of the indoor space;
An information processing unit that processes an image of the luminance distribution measured by the luminance distribution measuring unit to obtain a distribution image of an index value of a feeling of brightness in each predetermined area;
Changing means for changing the brightness of each predetermined area;
The change means so that the distribution range of the brightness index value in each predetermined area obtained by the information processing unit falls within the target range of the brightness index value set according to each predetermined area A dimming control unit for dimming control ,
The information processing unit provides the light environment control system characterized by changing the target range as time passes .

  In the present invention, since the light is adjusted based on a feeling of brightness rather than illuminance, it is possible to achieve an improvement in comfort and a feeling of concentration without feeling excessive or insufficient brightness. In addition, it can contribute to energy saving by suppressing excessive illuminance and brightness. That is, according to the present invention, it is possible to efficiently ensure an appropriate brightness feeling in an indoor space including daylight, and to achieve both comfort and energy saving.

It is a figure which shows schematically the structure of the light environment control system concerning embodiment of this invention. It is the figure which looked down at the indoor space of the task ambient office from the ceiling. It is a fragmentary sectional view of the indoor space of a task ambient office. It is a 1st figure which shows the flowchart of the light environment control method concerning this embodiment. It is a 2nd figure which shows the flowchart of the light environment control method concerning this embodiment.

  Embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a diagram schematically showing a configuration of a light environment control system according to an embodiment of the present invention. In the present embodiment, as an example, the present invention is applied to the control of the light environment in an office (hereinafter referred to as “task / ambient office”) in which a task / ambient lighting system is adopted.

  The task / ambient lighting method is a lighting method in which office lighting is divided into tasks (work) and ambient (ambient), and the base lighting is set low while ensuring the brightness of the work surface. FIG. 2 is a view of the indoor space of the task / ambient office looking down from the ceiling. FIG. 3 is a partial cross-sectional view of the indoor space of the task / ambient office.

  1 to 3, the light environment control system according to the present embodiment includes a luminance distribution measurement unit 1, an information processing unit 2, a blind control unit 3, and an illumination control unit 4. The luminance distribution measuring unit 1 measures the luminance distribution of the indoor space 10 where daylight (natural light) is incident through the window surface 11 in the task / ambient office. The information processing unit 2 processes the image of the luminance distribution measured by the luminance distribution measuring unit 1 to obtain a distribution image of the index value of the feeling of brightness.

  Specifically, the luminance distribution measuring unit 1 has a camera 1 a set toward the window surface 11, a plurality of cameras 1 b set toward the three wall surfaces 12, a floor surface 13, and a desk surface 14. And a plurality of set cameras 1c. These cameras 1a to 1c measure the luminance distribution in the corresponding region continuously and in real time.

  As an example, by installing the window camera 1a at the height of the worker's eyes as shown in FIG. 3, it is possible to secure an angle of view close to the line of sight when the worker views the blind 21. Although not shown, the wall surface camera 1b and the floor / desk surface camera 1c are installed at required positions along the ceiling surface 15, respectively. The cameras 1b and 1c may be installed at one place (for example, the center position) of the ceiling surface 15, or all the cameras 1a to 1c may be installed at one place on the ceiling surface 15.

  The information processing unit 2 processes the image of the luminance distribution measured by the camera 1a set toward the window surface 11, and obtains a distribution image of the brightness scale value that is an index value of the feeling of brightness on the window surface 11. obtain. Similarly, an image of the luminance distribution measured by the wall surface camera 1b is processed to obtain a distribution image of brightness scale values on the wall surface 12. Further, the brightness distribution image measured by the floor / desktop camera 1c is processed to obtain a brightness scale value distribution image on the floor surface 13 and a brightness scale value distribution image on the desk surface 14.

  That is, the information processing unit 2 continuously measures the distribution of brightness scale values in a desired region in real time. A technique for processing a brightness distribution image of a predetermined area to obtain a distribution image of brightness scale values in the area is disclosed in, for example, Japanese Patent No. 3959201 and Japanese Patent No. 4016072. In this patent, the brightness feeling corresponding to the luminance distribution is quantified into brightness scale values from 1 to 13, for example, by a unique method that considers adaptation of the human eye. The minimum value 1 of the brightness scale value corresponds to “very dark”, and the maximum value 13 of the brightness scale value corresponds to “very bright”.

  Thus, the sense of brightness is an index for evaluating the actually felt brightness in consideration of human visual characteristics. Specifically, for example, if a feeling of brightness in the space around the desk is appropriately secured, that is, if the feeling of brightness in the space is appropriately controlled, it will not feel dark even if the illuminance on the desk surface is lowered. The feature of the method disclosed in this patent is that a distribution image of brightness scale values is obtained based on the luminance distribution.

  In addition, the light environment control system according to the present embodiment contributes to the blind 21 provided on the window surface 11, the ambient lighting fixture 22 mainly contributing to the illumination of the wall surface 12 and the floor surface 13, and mainly the illumination of the desk top surface 14. And a task light (task lighting fixture) 23. That is, the blind 21 is a changing means for changing the feeling of brightness of the window surface 11, the ambient lighting fixture 22 is a changing means for mainly changing the feeling of brightness of the wall surface 12 and the floor surface 13, and the task light 23 is mainly used for a desk. This is a changing means for changing the feeling of brightness of the upper surface 14.

  The blind control unit 3 controls the opening degree (opening / closing degree) of the blind 21 as variable light shielding means that variably blocks daylight incident from the window surface 11. The lighting control unit 4 controls the output of the ambient lighting fixture 22 and the output of the task light 23. As will be described later, the blind control unit 3 and the illumination control unit 4 have a distribution range of brightness scale values obtained by the information processing unit 2 according to, for example, the window surface 11, the wall surface 12, the floor surface 13, and the desk surface 14. A dimming control unit that performs dimming control of the blind 21, the ambient lighting fixture 22, and the task light 23 is configured so as to fall within the target range.

  4 and 5 are flowcharts of the light environment control method according to the present embodiment. In the light environment control method according to the present embodiment, as shown in FIG. 4, the luminance distribution on the window surface 11 is measured, and the distribution of brightness scale values on the window surface 11 is obtained from the measured luminance distribution (S11). Specifically, in step S <b> 11, the information processing unit 2 processes the image of the luminance distribution measured by the window surface camera 1 a, and generates a distribution image of the brightness scale value corresponding to the luminance distribution on the window surface 11. obtain.

  Next, it is determined whether the distribution range (measured range) of the brightness scale value on the window surface 11 is within the target range corresponding to the window surface 11 (S12). Here, the target range is set, for example, as an appropriate range sandwiching the most appropriate brightness scale value. The actual measurement range is set as a range sufficiently narrower than the target range. This also applies to the following related steps S22, S32 and S42.

  Specifically, in step S12, for example, the measurement range of the brightness scale value in a part of the region of interest (or the entire region) of the window surface 11 and the feeling of brightness that the person feels appropriately about the window surface 11 are supported. The information processing unit 2 compares the target range of the brightness scale value, and if the actual measurement range is within the target range, the process proceeds to step S21. On the other hand, when at least a part of the actual measurement range protrudes in a direction higher than the target range, the blind control unit 3 opens the blind 21 in accordance with a command from the information processing unit 2 so that the actual measurement range falls within the target range. The degree is reduced by a required amount (S13a).

  Further, when at least a part of the actual measurement range protrudes in a direction lower than the target range, the blind control unit 3 opens the blind 21 in accordance with a command from the information processing unit 2 so that the actual measurement range falls within the target range. The degree is increased by a required amount (S13b). Steps S11 and S12 are repeated after step S13a or 13b until the actual measurement range falls within the target range. In this way, a feeling of brightness that a person appropriately feels about the window surface 11 is achieved. In general, since there is a relatively strong correlation between the feeling of brightness and the feeling of glare, an appropriate feeling of brightness that does not feel a feeling of glare on the window surface 11 is achieved.

  In the light environment control method according to the present embodiment, the luminance distribution on the wall surface 12 is measured, and the distribution of brightness scale values on the wall surface 12 is obtained from the measured luminance distribution (S21). Specifically, in step S <b> 21, the information processing unit 2 processes an image of the luminance distribution measured by the wall surface camera 1 b to obtain a distribution image of brightness scale values corresponding to the luminance distribution on the wall surface 12. Then, it is determined whether the measured range of the brightness scale value on the wall surface 12 is within the target range corresponding to the wall surface 12 (S22).

  In step S22, for example, an actual measurement range of the brightness scale value in a part (or all areas) of interest on the wall surface 12, and a target of the brightness scale value corresponding to the brightness feeling that the person feels appropriately on the wall surface 12. The information processing unit 2 compares the range, and if the actual measurement range is within the target range, the process proceeds to step S31. When at least a part of the actual measurement range protrudes in a direction higher than the target range, the illumination control unit 4 applies illumination to the wall surface 12 in accordance with a command from the information processing unit 2 so that the actual measurement range falls within the target range. Dimming control is performed so that the group of ambient lighting fixtures 22 that contribute dominantly become dark as much as necessary (S23a).

  In addition, when at least a part of the actual measurement range protrudes in a direction lower than the target range, the illumination control unit 4 follows the command from the information processing unit 2 so that the actual measurement range falls within the target range. Dimming control is performed so that the group of ambient lighting fixtures 22 that predominantly contribute to lighting is brightened to a required extent (S23b). After step S23a or 23b, steps S21 and S22 are repeated until the actual measurement range falls within the target range. Thus, a feeling of brightness that the person feels appropriately about the wall surface 12 is achieved.

  Furthermore, in the light environment control method according to the present embodiment, as shown in FIG. 5, the luminance distribution on the floor surface 13 is measured, and the distribution of brightness scale values on the floor surface 13 is obtained from the measured luminance distribution (S31). . Specifically, in step S31, the information processing unit 2 processes an image of the luminance distribution measured by the floor / desktop camera 1c to obtain a brightness scale value corresponding to the luminance distribution on the floor surface 13. Obtain a distribution image. Then, it is determined whether or not the measured range of the brightness scale value on the floor surface 13 is within the target range corresponding to the floor surface 13 (S32).

  In step S32, for example, the measured range of the brightness scale value in a part of the area (or all areas) of interest on the floor surface 13 and the brightness scale value corresponding to the feeling of brightness that the person feels about the floor surface 13 appropriately. The information processing unit 2 compares the target range, and if the actual measurement range is within the target range, the process proceeds to step S41. When at least a part of the actual measurement range protrudes in a direction higher than the target range, the illumination control unit 4 illuminates the floor surface 13 in accordance with a command from the information processing unit 2 so that the actual measurement range falls within the target range. The dimming control is performed so that the group of ambient lighting fixtures 22 that predominantly contribute to the darkness is darkened only as much as necessary (S33a).

  In addition, when at least a part of the actual measurement range protrudes in a direction lower than the target range, the lighting control unit 4 follows the instruction from the information processing unit 2 so that the actual measurement range falls within the target range. The dimming control is performed so that the group of ambient lighting fixtures 22 that contributes predominantly to the illumination of the lamp becomes brighter as much as necessary (S33b). After step S33a or 33b, steps S31 and S32 are repeated until the actual measurement range falls within the target range. In this way, a feeling of brightness that the person feels appropriately about the floor surface 13 is achieved.

  Finally, in the light environment control method according to the present embodiment, the luminance distribution on the desk top surface 14 is measured, and the distribution of the brightness scale value on the desk top surface 14 is obtained from the measured luminance distribution (S41). Specifically, in step 41, the information processing unit 2 processes an image of the luminance distribution measured by the floor / desktop camera 1 c to obtain a brightness scale value corresponding to the luminance distribution on the desktop 14. Obtain a distribution image. Then, it is determined whether or not the measured range of the brightness scale value on the desk surface 14 is within the target range corresponding to the desk surface 14 (S42).

  In step S42, for example, the information processing unit 2 compares the measured range of the brightness scale value on the desk surface 14 of interest with the target range of the brightness scale value corresponding to the brightness feeling that the person feels appropriately on the desk surface 14. If the actual measurement range is within the target range, the process returns to the first step S11. When at least a part of the actual measurement range protrudes in a direction higher than the target range, the illumination control unit 4 illuminates the desk top surface 14 according to a command from the information processing unit 2 so that the actual measurement range falls within the target range. The dimming control is performed so that the task light 23 that dominantly contributes to the light becomes dark as much as necessary (S43a).

  When at least a part of the actual measurement range protrudes in a direction lower than the target range, the lighting control unit 4 follows the command from the information processing unit 2 so that the actual measurement range is within the target range. The dimming control is performed so that the task light 23 that predominantly contributes to the illumination of the lamp becomes brighter as much as necessary (S43b). After step S43a or 43b, steps S41 and S42 are repeated until the actual measurement range falls within the target range. Thus, a feeling of brightness that a person feels appropriately about the desk surface 14 is achieved.

  In addition, the state of the daylight which injects into the indoor space 10 changes with progress of time. Therefore, by repeating a series of steps from step S11 to step S42 (or 43a, 43b) over the entire time period in which daylight is incident, an appropriate brightness feeling that does not feel glare on the window surface 11 is obtained. Is always achieved, and a feeling of brightness that a person feels appropriately about the wall surface 12, the floor surface 13, and the desk surface 14 is always achieved.

  In the present embodiment, in the indoor space 10 where daylight enters through the window surface 11, the brightness of the window surface 11, the wall surface 12, the floor surface 13, and the desk surface 14 is measured in real time, and the measurement result is Based on this, the opening / closing control of the blind 21 and the dimming control of the artificial lighting (22, 23) are performed so that excessive daylight is prevented from entering and a proper brightness is ensured. As a result, the glare of the window surface 11 is suppressed, and a feeling of brightness preset in the indoor space 10 is ensured.

  Therefore, if the feeling of brightness of the indoor space 10 is set to such a degree that the person does not feel uncomfortable, the output of the overall lighting (22, 23) can be suppressed, and thus comfort and energy saving are achieved. It can be compatible. That is, in the present embodiment, the light is adjusted based on the brightness feeling, not the illuminance, so that it is possible to achieve an improvement in comfort and a feeling of concentration without feeling excessive or insufficient brightness feeling. it can.

  Further, in the present embodiment, as time passes, a target range corresponding to the window surface 11, a target range corresponding to the wall surface 12, a target range corresponding to the floor surface 13, a target range corresponding to the desk surface 14, etc. Variations that change as appropriate are also possible. In this case, the biological rhythm of the person can be adjusted and the sense of concentration can be improved by intentionally controlling the feeling of brightness in the room over time. Moreover, an appropriate brightness feeling can be ensured by efficient lighting, which can contribute to energy saving. In addition, by designing to gradually reduce the brightness from the entrance of the building to the office area, it is possible to adapt to the adaptation of the eyes, a brightness feeling that does not cause problems even at a lower level of brightness You can set it.

  In the indoor space 10 of the above-described embodiment, a blind 21 is provided on the window surface 11 facing the wall surface 12. However, the present invention is not limited to the blind, and other appropriate variable light shielding means that variably blocks the daylight incident from the window surface can be used. Moreover, it is not limited to the window surface facing a wall surface, For example, the suitable variable light-shielding means may be provided in the window surface provided in a part of ceiling surface. Alternatively, daylight may be introduced into the room from the roof via an optical duct. Therefore, the “window surface” in the present specification is not limited to a normal window surface provided on a wall or a ceiling, but is a broad concept including a surface where daylight is introduced into a room.

  In the above description, the present invention is applied to the control of the light environment in the task ambient office. However, the present invention is not limited thereto, and is generally an indoor space where daylight is incident through a window surface, for example, an office, an entrance hall, a hospital room, a classroom, an auditorium, a hall, an apartment house that does not employ a task / ambient lighting system. Similarly, the present invention can be applied to the control of the light environment such as the void space.

DESCRIPTION OF SYMBOLS 1 Brightness distribution measurement part 1a, 1b, 1c Camera 2 Information processing part 3 Blind control part 4 Illumination control part 10 Indoor space 11 Window surface 12 Wall surface 13 Floor surface 14 Desk top surface 15 Ceiling surface 21 Blind 22 Ambient lighting fixture 23 Task light ( Task lighting equipment)

Claims (11)

In the light environment control method for controlling the light environment of the indoor space including daylight,
A distribution acquisition step of measuring a luminance distribution in each predetermined region for a plurality of predetermined regions in the indoor space, and obtaining a distribution of brightness index values in each predetermined region from the measured luminance distribution;
Change to change the brightness feeling of each predetermined area so that the distribution range of the brightness index value in each predetermined area falls within the target range of the brightness index value set according to each predetermined area and the dimming control step of controlling the dimming means only including,
In the dimming control step, the target range is changed with the passage of time . The changing means includes variable light shielding means that variably blocks daylight incident from a window surface,
The distribution acquisition step includes a first step of measuring a luminance distribution on the window surface, and obtaining a distribution of an index value of a feeling of brightness on the window surface from the measured luminance distribution,
The dimming control step includes a second step of controlling the variable light shielding unit so that the distribution range of the index value of the brightness feeling on the window surface is within a target range corresponding to the window surface. The light environment control method according to claim 1, wherein: The variable light-shielding means has a blind provided on the window surface,
The light environment control method according to claim 2, wherein the second step includes controlling an opening degree of the blind. After the second step, a third step of measuring a luminance distribution on the wall surface and obtaining a distribution of the index value of the feeling of brightness on the wall surface from the measured luminance distribution;
A fourth step of dimming and controlling a group of ambient lighting fixtures that contribute to the illumination of the wall surface so that the distribution range of the brightness index value on the wall surface is within a target range corresponding to the wall surface; The light environment control method according to claim 2, further comprising: After the fourth step, the fifth step of measuring the luminance distribution on the desk surface and obtaining the distribution of the index value of the feeling of brightness on the desk surface from the measured luminance distribution;
A sixth step of dimming and controlling a task lighting fixture that contributes to illumination of the desk top surface such that a distribution range of the index value of the brightness feeling on the desk top surface is within a target range corresponding to the desk top surface; The light environment control method according to claim 4, further comprising: In the light environment control system that controls the light environment of the indoor space including daylight,
A luminance distribution measuring unit that measures the luminance distribution in each predetermined region for a plurality of predetermined regions of the indoor space;
An information processing unit that processes an image of the luminance distribution measured by the luminance distribution measuring unit to obtain a distribution image of an index value of a feeling of brightness in each predetermined area;
Changing means for changing the brightness of each predetermined area ;
The change means so that the distribution range of the brightness index value in each predetermined area obtained by the information processing unit falls within the target range of the brightness index value set according to each predetermined area A dimming control unit for dimming control,
The light environment control system, wherein the information processing unit changes the target range as time passes . The light environment control system according to claim 6, wherein the luminance distribution measurement unit includes a camera set for each predetermined region . The light environment control system according to claim 6, wherein the changing unit includes a variable light blocking unit that variably blocks daylight incident from a window surface . The light environment control system according to claim 8 , wherein the variable light shielding unit includes a blind provided on the window surface . 10. The light environment control system according to claim 8, wherein the changing unit further includes a group of ambient lighting fixtures that contribute to lighting of a wall surface and a group of ambient lighting fixtures that contribute to lighting of a floor surface. 10. . The light environment control system according to claim 10 , wherein the changing unit further includes a task lighting device that contributes to lighting of a desk surface .

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