Daylighting facility

Abstract

To provide a daylighting facility capable of ensuring an appropriate amount of daylight from an opening in a building according to environmental conditions such as the angle of sunlight.SOLUTION: A daylighting facility 10 of the present invention is installed in a building A1 and adjusts the amount of daylight coming in through an opening in the building A1. The daylighting facility comprises: an eaves portion 13 protruding to the outside of the building A1 from above the opening and constituted by a light-transmitting diffusion plate 11; a drive mechanism 2 which changes the amount of protrusion L of the eaves portion 13 and an inclination K of the eaves portion 13; and a control device 3 which controls the drive mechanism 2 to adjust the amount of protrusion L and the inclination K.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a daylighting system for use in buildings, and more particularly to a daylighting system capable of ensuring the amount of daylighting according to environmental conditions. [Background technology]

[0002] Openings such as windows and daylighting equipment for collecting sunlight through the openings are already well known for buildings. For example, in the daylighting equipment (daylighting equipment) described in Patent Document 1, sunlight is scattered by the daylighting equipment and can be suitably collected into the building through the openings. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-85730 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, when using the daylighting equipment described in Patent Document 1 to let sunlight into a building, it is necessary to take into consideration the solar irradiance angle and amount of irradiation, as well as environmental conditions such as surrounding obstructions. In addition, the solar irradiance angle and amount of irradiation tend to vary depending on the time of year (season), and unless this point is reflected in the daylighting equipment, there is a possibility that the amount of sunlight let into the building will not be adequately ensured.

[0005] The present invention has been made in consideration of the above circumstances, and aims to solve the above problems. Specifically, the present invention aims to provide a daylighting system that can ensure an appropriate amount of daylighting from an opening in a building according to environmental conditions such as the angle of sunlight. [Means for solving the problem]

[0006] In order to achieve the above-mentioned objectives, the daylighting equipment of the present invention is installed in a building and adjusts the amount of daylight entering through an opening in the building, and is characterized in that it comprises a eaves portion that protrudes outside the building from above the opening and is constructed from a light-transmitting diffusion plate, a drive mechanism that changes the amount of protrusion and the inclination of the eaves portion, and a control device that controls the drive mechanism to adjust the amount of protrusion and the inclination.

[0007] In the daylighting equipment of the present invention configured as described above, the control device can adjust the projection amount and inclination of the eaves part via the drive mechanism, thereby adjusting the incident angle of sunlight to the light-transmitting diffusion plate. This makes it possible to ensure an appropriate amount of daylighting from the opening of the building according to environmental conditions such as the angle of sunlight irradiation.

[0008] In addition, the daylighting equipment of the present invention may include a sensor that is positioned adjacent to the opening and outputs a signal according to the amount of received light, and the control device may control the drive mechanism based on the output signal from the sensor. In the above configuration, the control device can control the drive mechanism based on information about the amount of received sunlight output by the sensor disposed adjacent to the opening.

[0009] In addition, in the present invention, the building is a multi-story building and has a first opening as an opening and a second opening provided on a floor above the first opening, the eaves portion protrudes from a position above the second opening, and the sensor is positioned adjacent to the first opening. In the above configuration, the control device can determine whether an appropriate amount of light is being let in by adjusting the state of the eaves portion located at a higher position on the building based on a signal output by a sensor located at a lower position on the building, and thereby adjusting the amount of light let in to the opening adjacent to the sensor.

[0010] In addition, in the daylighting system of the present invention, the control device may control the drive mechanism based on information on the location of the building and the angle of solar radiation at the date and time. In the above configuration, the control device calculates the sunlight irradiation angle based on the date, time, the location of the building, etc., and can ensure an appropriate amount of lighting according to the calculated sunlight irradiation angle.

[0011] In addition, in the daylighting equipment of the present invention, the light-transmitting diffusion plate that constitutes the eaves portion is continuous in a strip, and at least a portion of the strip-shaped light-transmitting diffusion plate protrudes outward beyond the exterior wall of the building to constitute the eaves portion, and the driving mechanism can change the amount of protrusion by changing the length of the portion of the strip-shaped light-transmitting diffusion plate that protrudes outward beyond the exterior wall as the eaves portion. In the above configuration, the amount of protrusion of the eaves portion can be changed by rolling or unrolling the strip-shaped light-transmitting diffusion plate, and the driving mechanism can adjust the amount of light entering the opening by changing the amount of protrusion of the eaves portion.

[0012] In addition, in the lighting equipment of the present invention, the drive mechanism has a support arm that supports the eave portion, and the support arm is installed in a state that allows it to rotate around an axis along the horizontal direction, and the drive mechanism changes the inclination by rotating the support arm. In the above configuration, the inclination of the eaves portion can be changed by rotating the support arm, and the drive mechanism can change the inclination of the eaves portion to adjust the amount of light admitted to the opening portion.

[0013] In addition, in the lighting equipment of the present invention, the control device may control the drive mechanism based on the combination of protrusion amount and inclination that results in the smallest protrusion amount among combinations of protrusion amount and inclination that satisfy the control conditions for the optical path of sunlight refracted by the eaves portion. In the above configuration, it is possible to appropriately set a combination of the protrusion amount and inclination of the eaves portion that can ensure an appropriate amount of light. Effect of the Invention

[0014] According to the present invention, it is possible to provide a daylighting system that can ensure an appropriate amount of daylight from an opening in a building depending on environmental conditions such as the angle of sunlight. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is an elevation view of a building equipped with daylighting equipment according to one embodiment of the present invention, and an adjacent building constructed around the building, showing an example of a situation in which the daylighting equipment is in use. [Diagram 2] FIG. 1 is a top view of a daylighting facility according to an embodiment of the present invention. [Diagram 3] FIG. 3 is a cross-sectional view of the daylighting facility according to one embodiment of the present invention, showing cross section II of FIG. 2. [Figure 4] FIG. 1 is a side view of a daylighting facility according to one embodiment of the present invention, showing an internal structure of the daylighting facility. [Diagram 5] FIG. 2 is a side view of a daylighting facility according to one embodiment of the present invention, showing the internal structure of the daylighting facility when the inclination of the eave portion is changed. [Figure 6] FIG. 1 is a block diagram showing a system of a daylighting facility according to one embodiment of the present invention. [Figure 7] FIG. 2 is an enlarged view of a portion of a light-transmitting diffusion plate of a daylighting device according to one embodiment of the present invention, showing a scene in which light is refracted by the light-transmitting diffusion plate. [Figure 8] 1 is a table illustrating environmental conditions according to one embodiment of the present invention. [Figure 9] 1 is a table showing the daylight height for a number of eave portion states according to one embodiment of the present invention. [Figure 10] FIG. 2 is a diagram showing a control process flow by a control device of a daylighting facility according to one embodiment of the present invention. [Figure 11] FIG. 1 is an elevation view of a building equipped with a conventional daylighting system, showing an example of a situation in which the daylighting system is used. [Figure 12] 1 is an elevation view of a building equipped with a daylighting system according to an embodiment of the present invention, and shows another example of how the daylighting system is utilized. [Figure 13] 1 is an elevation view of a building equipped with a daylighting system according to an embodiment of the present invention, and shows another example of how the daylighting system is utilized. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] <<Specific embodiments of the present invention>> A daylighting system (hereinafter, daylighting system 10) according to one embodiment of the present invention (hereinafter, this embodiment) will be described with reference to FIGS. 1 to 10. However, the embodiment described below is merely an example to facilitate understanding of the present invention, and does not limit the present invention. In other words, the present invention may be modified or improved without departing from the spirit of the present invention. Furthermore, the present invention naturally includes equivalents thereof.

[0017] In addition, in each figure, for convenience of illustration, structures that are actually hidden inside and cannot be seen from the outside may be shown by solid or dashed lines. In addition, in each figure, in order to make the explanation easier to understand, various components are omitted and the illustrations are simplified and schematic, and the dimensions of each component and the spacing between components shown in the figure may differ from the actual ones. In addition, in each drawing, for convenience of illustration, the optical paths of light such as sunlight and refracted light are indicated by arrows. In the following description, people who live in the building A1 and use the daylighting system 10 will be referred to as "residents."

[0018] The daylighting equipment 10 is installed in a building A1 as shown in Fig. 1. The building A1 is a multi-story building built adjacent to the north side of a neighboring building A2, and in this embodiment, as shown in Fig. 1, is a two-story building. As shown in Fig. 1, each floor of the building A1 has a first opening B1 provided on the first floor as an opening, and a second opening B2 provided on a floor above the first opening B1 (i.e., the second floor). Each opening may preferably have a window.

[0019] In this embodiment, the daylighting equipment 10 has an awning 13 that protrudes from an exterior wall C of the building A1 to the outside of the building A1, as shown in Figures 2 and 4. The awning 13 is installed on the exterior wall C of the building A1 at a position above the second opening B2, as shown in Figure 2. The direction in which the awning 13 of the daylighting equipment 10 protrudes is called the "protruding direction" as shown in Figures 2 and 4, and the horizontal direction of the width of the exterior wall C on which the daylighting equipment 10 is installed is called the "width direction" as shown in Figure 1.

[0020] In seasons when the sun's radiation angle M is small, such as in winter or in the mornings and evenings, the neighboring building A2 may act as a shield and block the sunlight heading toward building A1, as shown in Figure 1. Therefore, in seasons when the sun's radiation angle M is small, it is difficult for building A1 to ensure the amount of sunlight taken into the building, i.e., the amount of daylight, and it is particularly difficult to ensure the amount of daylight on the first floor of building A1. Therefore, as shown in FIG. 1, the daylighting equipment 10 of the present embodiment is used to ensure the amount of daylight, and in particular, is used to ensure the amount of daylight on the first floor of the building A1.

[0021] [Overall configuration of the daylighting equipment according to this embodiment] The overall configuration of a daylighting facility 10 according to this embodiment will be described with reference to Figures 1 to 7. As shown in Figures 1, 2, and 4, the daylighting facility 10 includes a belt-shaped sheet 1, a drive mechanism 2, a sensor 3, and a control device 4. Below, each component of the daylighting system 10 will be described.

[0022] (Strip sheet) As shown in Figures 2 to 4, the strip-shaped sheet 1 is composed of light-transmitting diffusion plates 11 and connecting metal fittings 12. More specifically, as shown in Figures 2 to 4, the strip-shaped sheet 1 has a plurality of light-transmitting diffusion plates 11 arranged in a row in the continuous direction, and adjacent light-transmitting diffusion plates 11 in the continuous direction are connected to each other by connecting metal fittings 12, thereby forming a continuous strip-like sheet.

[0023] One end (base end) in the continuous direction of the strip-shaped sheet 1 is fixed to a rod (not shown) connected to a motor shaft 23, as shown in Figures 2 and 4. Both ends in the width direction of the strip-shaped sheet 1 are fitted into telescopic guides 21 of the drive mechanism 2 via connecting hardware 12, as shown in Figures 2 and 3, and are installed in a movable state together with the connecting hardware 12 and the telescopic guide 21. 4 and 5, the strip-shaped sheet 1 is supported by a support arm 22 of the drive mechanism 2 so as to be rotatable about an axis along the width direction. Also, the strip-shaped sheet 1 is supported by a motor shaft 23 of the drive mechanism 2 (strictly speaking, a rod body (not shown) connected to the motor shaft 23) so as to be movable integrally with the extendable guide 21 along the protruding direction.

[0024] The light-transmitting diffusion plate 11 is a rectangular plate-like member made of a transparent material such as glass or quartz, like a prism sheet, and has one flat surface and the other surface with sawtooth-like irregularities, as shown in Fig. 7. In this embodiment, the light-transmitting diffusion plate 11 is installed with the flat surface facing vertically upward and the surface with irregularities facing vertically downward. When sunlight is irradiated onto the light-transmitting diffuser plate 11, the sunlight is refracted uniformly at the flat surface (the surface facing upward) of the light-transmitting diffuser plate 11 in accordance with Snell's law, as shown in Fig. 7. At this time, since the flat surface of the light-transmitting diffuser plate 11 faces upward and the uneven surface faces downward, the sunlight can be taken in at the same solar incidence angle M, and the light refracted by the light-transmitting diffuser plate 11 tends to travel in a straight line. The refractive index of the light-transmitting diffuser plate 11 (hereinafter also referred to as the refractive index n) is stored in the control device 4 as shown in FIG.

[0025] The portion of the strip sheet 1 that is currently being used forms the eaves portion 13 and protrudes in the protruding direction from an upper position of the second opening B2 toward the outside of the building A1, as shown in Figures 4 and 5. On the other hand, the portion of the strip sheet 1 that is not currently being used forms the roll portion 14, as shown in Figures 4 and 5, and is stored in the storage case 24 of the drive mechanism 2 in a rolled state around the motor shaft 23 (strictly speaking, a rod body, not shown, connected to the motor shaft 23).

[0026] The tilt angle K of the protruding direction of the eaves portion 13 formed by the belt-shaped sheet 1 and the protruding amount L in the protruding direction are adjusted to optimal states by the control device 4 according to environmental conditions such as the solar radiation angle M of sunlight.

[0027] The belt-shaped sheet 1 is exposed to the outside air and direct sunlight, so it is preferable to use a material that can withstand the external environment and corrosion.

[0028] (Drive mechanism) As shown in FIGS. 2, 4, and 5, the drive mechanism 2 is made up of an extendable guide 21, a support arm 22, a motor shaft 23, and a storage case 24. The drive mechanism 2 is installed on an outer wall C as shown in FIG. 1, and more specifically, a storage case 24 for the drive mechanism 2 is attached and fixed to the outer wall C as shown in FIG.

[0029] In the telescopic guide 21 of the drive mechanism 2, one end side of the protruding direction of the telescopic guide 21 is installed at the upper corner of the part of the storage case 24 located opposite the outer wall C, in a state where it can rotate around a rotation axis along the width direction, as shown in Figures 4 and 5. The installation position of the telescopic guide 21, specifically, the height of the rotation axis of the telescopic guide 21 (hereinafter, installation height H1 (see FIG. 1)) is stored in the control device 4 as shown in FIG. 2 and 3, the strip-shaped sheet 1 is placed between the two telescopic guides 21. Inside the telescopic guide 21, there is a slit 27 extending in the protruding direction as shown in Fig. 3, and the connecting metal piece 12 is movably fitted into the slit 27, so that the strip-shaped sheet 1 is fixed between the two telescopic guides 21 so as to be movable.

[0030] 4 and 5, one end of the support arm 22 of the drive mechanism 2 is attached to a lower corner of the storage case 24 on the opposite side to the outer wall C in a state where it can rotate about an axis along the width direction of the eaves portion 13. The other end (tip) of the support arm 22 is attached to the basic tube member 26 of the telescopic guide 21 in a state where it can rotate about an axis along the width direction of the eaves portion 13. As described above, two support arms 22 are provided, and each is provided in the manner described above.

[0031] The telescopic guide 21 is a rod having a mechanism for telescopically extending in the protruding direction, like a telescopic fishing rod. Specifically, as shown in Figures 2, 4, and 5, the telescopic guide 21 is composed of multiple tubular members 25 whose cross-sectional size changes stepwise, and has a nested structure in which each tubular member 25, starting from the basic tubular member 26 having the largest cross-sectional size, is inserted into the tubular member 25 having the next smaller cross-sectional size, in order of cross-sectional size. With this mechanism, the telescopic guide 21 is driven to be telescopically extendable in the protruding direction by the rotation of the motor shaft 23 via the visor portion 13 whose both ends are fixed to the telescopic guide 21. The support arm 22 is a known hydraulic arm, and as shown in Figs. 4 and 5, has a mechanism for rotating the extendable guide 21 and the eaves portion 13 about an axis along the width direction.

[0032] The motor shaft 23 is a rotatable shaft in the width direction installed inside the storage case 24, and is connected to the base end of the strip sheet 1 via a rod (not shown), and the amount of rotation is controlled by the control device 4. The amount of rotation of the motor shaft 23 is adjusted by the control device 4, so that the protruding amount L of the overhanging portion 13 is changed. The storage case 24 is a case for storing the unused belt-shaped sheet 1 in the form of a roll portion 14, as shown in FIGS.

[0033] The drive mechanism 2 is controlled by the control device 4 and changes the protrusion amount L of the overhanging portion 13 and the inclination K of the overhanging portion 13 . Specifically, the drive mechanism 2 rotates the motor shaft 23 to change the length of the portion of the strip sheet 1 that protrudes along the extensible guide 21, thereby changing the protrusion amount L of the overhanging portion 13. In addition, the drive mechanism 2 rotates the support arm 22 to change the inclination K of the overhanging portion 13.

[0034] The operation of the drive mechanism 2 when changing the protrusion amount L of the overhanging portion 13 and the inclination K of the overhanging portion 13 will be described.

[0035] In the daylighting equipment 10, when the motor shaft 23 rotates in the forward direction, the strip sheet 1 is wound up and stored inside the storage case 24 and the telescopic guide 21 shortens, resulting in a decrease in the protruding amount L of the eaves portion 13. Conversely, when the motor shaft 23 rotates in the reverse direction, a portion of the strip sheet 1 is unwound from the roll portion 14 and discharged outside the storage case 24 and extends along the telescopic guide 21, resulting in an increase in the protruding amount L of the eaves portion 13. This mechanism changes the protruding amount L of the eaves portion 13. Furthermore, as the support arm 22 extends, the telescopic guide 21 rotates upward, and the tip of the eaves portion 13 rotates in a direction that raises the height of the eaves portion 13. Conversely, as the support arm 22 contracts, the telescopic guide 21 rotates downward, and the tip of the eaves portion 13 rotates in a direction that lowers the height of the eaves portion 13. This rotation of the eaves portion 13 changes the inclination K of the eaves portion 13.

[0036] (Sensor) The sensor 3 is a signal output device, specifically an optical sensor, that receives and detects light such as sunlight, and outputs a signal according to the amount of received light to the control device 4. Then, the control device 4 controls the drive mechanism 2 based on the output signal from the sensor 3. As shown in Fig. 1, one sensor 3 is installed at a position adjacent to the lower part of the first opening B1, and can detect light irradiated onto the lower part of the first opening B1 over the entire width direction. The height from the ground where the sensor 3 is installed is stored in the control device 4 as the sensor height H2 (see Fig. 1) as shown in Fig. 8. Based on the output signal from the sensor 3 and the sensor height H2, the control device 4 can determine whether sufficient sunlight is being received through the first opening B1 of the building A1. In other words, based on the amount of light received by the sensor 3, the amount of daylight entering the building A1 through the first opening B1 can be estimated.

[0037] (Control device) The control device 4 is, for example, a general-purpose computer or control circuit, and transmits and receives signals and information between the drive mechanism 2 and the sensor 3 as shown in Fig. 6, and determines whether a sufficient amount of light is obtained through the first opening B1. The control device 4 also controls the drive mechanism 2 based on a signal received from the sensor 3. That is, the control device 4, together with the drive mechanism 2 and the sensor 3, constitutes a control system (hereinafter, system S of the daylighting equipment 10) as shown in Fig. 6. To explain in more detail, as shown in Figure 6, the control device 4 controls the support arm 22 and motor shaft 23 of the drive mechanism 2 based on the output signal from the sensor 3 and the environmental conditions, thereby adjusting the protrusion amount L and inclination K of the eave portion 13 of the strip sheet 1.

[0038] 2, one control device 4 is installed under the daylighting facility 10. However, as long as the control device 4 functions normally, the installation location and the number of control devices 4 are not particularly limited.

[0039] [Selection of the state of the eaves in this embodiment] 8 and 9, the control device 4 selects an optimal state of the eaves portion 13 from among a plurality of states of the eaves portion 13 that satisfy the control conditions according to the environmental conditions through the system S of the daylighting equipment 10, and controls the drive mechanism 2. Here, the state of the eaves portion 13 refers to a combination of the protrusion amount L of the eaves portion 13 and the inclination K of the eaves portion 13. Specifically, the control device 4 acquires environmental information such as the solar radiation angle M based on the location of building A1 and the date and time, as shown in Fig. 8. The control device 4 then calculates the states of multiple eaves portions 13 from the environmental conditions, and identifies multiple states of eaves portions 13 that satisfy the control conditions, as shown in Fig. 9. Furthermore, the control device 4 selects the state in which the protrusion amount L of eaves portions 13 is smallest as the optimal state of eaves portions 13 from the multiple states of eaves portions 13 that satisfy the control conditions, and controls the drive mechanism 2.

[0040] The environmental conditions are conditions related to the environment outside the building A1, such as the solar radiation angle M of sunlight and obstructions around the building A1 (e.g., the neighboring building A2), etc. The control condition is a condition that light incident on the eaves portion 13 at the solar radiation angle M is refracted by the light-transmitting diffusion plate 11 constituting the eaves portion 13 and passes through the sensor 3.

[0041] A specific method in which the control device 4 selects the optimum state of the eaves portion 13 that satisfies the control conditions in accordance with the environmental conditions will be described below with reference to FIGS.

[0042] (How to obtain environmental conditions) When acquiring the solar radiation angle M as an environmental condition, the control device 4 acquires information regarding the location (latitude, longitude, and altitude) of the daylighting equipment 10 and the date and time (date and time), as shown in FIG. 8, determines the direction and altitude at which the sun is located, and acquires the solar radiation angle M of the sunlight. Therefore, it is preferable that the control device 4 stores in advance the location of the building A1 in which the daylighting equipment 10 is installed and has a built-in clock function. The control device 4 may also communicate with an external device (information source) through a communication network to obtain information related to the location and information related to the solar radiation angle M of sunlight. In addition, the control device 4 may calculate the effect of obstructions around the building A1 on the amount of received light by comparing the theoretical amount of received light calculated from the acquired solar radiation angle M with data on the actual amount of received light detected by the sensor 3.

[0043] (How to select the optimal condition for the eaves) When selecting the optimal state of the eaves portion 13 that satisfies the control conditions, the control device 4 first calculates the combination of the protrusion amount L and inclination K of the eaves portion 13 for the solar radiation angle M obtained as the environmental condition, as shown in Figure 9.

[0044] First, the control device 4 provisionally sets a predetermined protrusion amount L of the eaves portion 13 and an inclination K of the eaves portion 13. From the set protrusion amount L of the eaves portion 13 and the inclination K of the eaves portion 13, the vertical length L of the eaves portion 13 is calculated as v (The vertical distance from the rotation axis of the eaves portion 13 to the tip of the eaves portion 13 (see FIG. 1)) is calculated by the following formula (1). L v =LsinK (1) Next, the horizontal length L of the eaves portion 13 is calculated from the set protrusion amount L of the eaves portion 13 and the inclination K of the eaves portion 13. h (The horizontal distance from the rotation axis of the eaves portion 13 to the tip of the eaves portion 13 (see FIG. 1)) is calculated by the following formula (2). L h =LcosK (2)

[0045] Then, the refraction angle N of the sunlight is calculated from the solar incidence angle M of the eaves portion 13, and the refractive index n of the light-transmitting diffusion plate 11 of the eaves portion 13 (for example, in this embodiment, n = 1.45) using the following equation (3) applying Snell's law. sin(90-M+K)=nsin(90-N+K) (3) Furthermore, the refraction angle N of the sunlight and the horizontal length L of the eaves portion 13 h , the installation height H1 of the rotation axis of the eaves portion 13 from the ground, and the vertical length L v From this, the lighting height H3 from the ground at which the sunlight reaches (i.e., the point at which the sunlight reaches (see Figure 1)) is calculated using the following formula (4). H3=H1+L v-L h tanN (4)

[0046] Then, as shown in Figure 9, the control device 4 repeats the above procedure of calculating the light-gathering height H3 by sequentially changing the provisionally set inclination K of the eaves portion 13 and the protrusion amount L of the eaves portion 13, and calculates the light-gathering height H3 for multiple values ​​of the protrusion amount L and inclination K of the eaves portion 13 at the solar radiation angle M.

[0047] The table shown in Figure 9 calculates the refraction angle N of sunlight for each of multiple inclinations K of the eaves portion 13 for the obtained solar radiation angle M, and summarizes the calculation results of the light collection height H3 corresponding to multiple combinations of the refraction angle N and the protrusion amount L, i.e., multiple states of the eaves portion 13.

[0048] The control device 4 calculates the combination of the protrusion amount L and inclination K of the eaves portion 13 for the solar radiation angle M, and then calculates the combination of the protrusion amount L and inclination K of the eaves portion 13 that satisfies the control conditions (the state of the eaves portion 13), and selects the optimal state of the eaves portion 13.

[0049] If the daylight height H3 is a value smaller than the sensor height H2 (H3≦H2), the sensor 3 can receive light, and the control device 4 determines that the control conditions are met and the daylighting equipment 10 can receive light. On the other hand, if the daylight height H3 is a value larger than the sensor height H2 (H3>H2), the sensor 3 cannot receive light, and the control device 4 determines that the control conditions are not met and the daylighting equipment 10 cannot receive light. For example, in Fig. 9, the control condition is satisfied when the value of the light collection height H3 is smaller than the sensor height H2 of 400 mm. Note that in the table shown in Fig. 9, the light collection height H3 corresponding to the state that satisfies the control condition is listed in the gray-hatched columns in the table.

[0050] Finally, among the combinations of protrusion amount L and tilt K of eaves portion 13 that satisfy the control conditions for the solar radiation angle M, the control device 4 selects the combination of protrusion amount L and tilt K that minimizes the protrusion amount L of eaves portion 13 as the optimal state of eaves portion 13. In the table shown in Fig. 9, the state in which the daylight collection height H3 is 54 mm, which is written in the column surrounded by a thick frame, is the optimal state that satisfies the control conditions, and specifically, the protrusion amount L is 1800 mm and the tilt K is 30°. As described above, the control device 4 performs control so as to bring the inclination K of the eaves portion 13 as close as possible to the solar radiation angle M and to shorten the protrusion amount L.

[0051] [Control process flow of the daylighting equipment according to this embodiment] The control process flow of the system S controlled by the control device 4 of the daylighting facility 10 according to this embodiment will be described with reference to FIG.

[0052] The control process flow according to this embodiment proceeds according to the flow shown in Fig. 10 by the system S of the daylighting equipment 10 shown in Fig. 6. Note that the control process flow described below is merely an example, and unnecessary steps may be deleted and new steps may be added without departing from the spirit of the present invention. The following will mainly specifically explain the process flow by the control device 4.

[0053] First, when the control device 4 recognizes that a resident has issued an operation requesting the start of a control process flow, the control process flow is started. Next, the control device 4 acquires an environmental condition related to the solar radiation angle M of sunlight from the location of the daylighting facility 10 and the date and time (S001). Then, the control device 4 calculates the light collection height H3 for the protrusion amount L and inclination K of the eaves portion 13 in multiple states at the solar radiation angle M of the sunlight (S002), and calculates a combination of the protrusion amount L and inclination K of the eaves portion 13 that satisfies the control conditions among the light collection height H3 for the multiple states (S003).

[0054] Then, the control device 4 selects an optimal combination of the protrusion amount L and the inclination K of the eaves portion 13 that satisfies the control conditions from among a plurality of combinations of the protrusion amount L and the inclination K of the eaves portion 13 that satisfy the control conditions (S004). Furthermore, the control device 4 controls the drive mechanism 2 based on the selected optimal combination of the protrusion amount L and inclination K of the eaves portion 13 to change the protrusion amount L and inclination K of the eaves portion 13 (S005).

[0055] Thereafter, the control device 4 receives an output signal from the sensor 3 and determines whether a sufficient amount of light is being received through the first opening B1 (S006). If the amount of light collected through the first opening B1 is insufficient (S006: NO), the control device 4 controls the drive mechanism 2 to increase the protrusion amount L of the eaves portion 13 (S007). After S007, the control device 4 repeats S006 again to determine whether a sufficient amount of light is collected through the first opening B1 (S006). On the other hand, if a sufficient amount of light is allowed through the first opening B1 (S006: YES), the control device 4 maintains the protrusion amount L and the inclination K of the eaves portion 13 unchanged for a predetermined time (S008).

[0056] After S008, the control device 4 checks whether or not the resident has issued an end request operation for the control process flow (S009). If there is no operation by the resident to request an end of the control process flow (S009: NO), the control device 4 returns to S001 after a predetermined time has elapsed (S010) and acquires an environmental condition related to the solar radiation angle M of the sunlight (S001). Thereafter, the flow from S002 to S009 is repeated in the same manner as described above. On the other hand, if the resident issues an end request operation for the control process flow (S009: YES), the control process flow ends.

[0057] [Effectiveness of the daylighting equipment according to this embodiment] The effectiveness of the daylighting system 10 according to this embodiment will be described with reference to FIGS.

[0058] In a conventional daylighting system 100, as shown in FIG. 11, sunlight is scattered, and openings such as windows are provided in a building A1 to allow the sunlight to enter the building A1. However, in conventional daylighting equipment 100, when collecting sunlight, it is not taken into consideration that environmental conditions such as the solar radiation angle M and the amount of irradiation of sunlight change depending on the time of day, season, etc., and daylighting equipment 100 remains in a fixed state at the time of installation. Therefore, with such daylighting equipment 100, the state of daylighting equipment 100 is not appropriately adjusted, and there is a possibility that the amount of daylight collected is not appropriately secured. Furthermore, one method of ensuring sufficient lighting is to install skylights in building A1. However, in that case, it would be necessary to provide an open atrium space directly below the skylights, which would impose restrictions on the floor plan.

[0059] In contrast, the daylighting equipment 10 of this embodiment, as shown in Figures 1 and 4, comprises an eaves portion 13 formed by a light-transmitting diffusion plate 11, a drive mechanism 2 that changes the protrusion amount L of the eaves portion 13 and the inclination K of the eaves portion 13, and a control device 4 that controls the drive mechanism 2 to adjust the protrusion amount L and the inclination K.

[0060] In the daylighting equipment 10 according to this embodiment configured as described above, the control device 4 adjusts the state of the eaves portion 13, such as the amount of protrusion L and the inclination K of the eaves portion 13, via the drive mechanism 2. This allows the state of the eaves portion 13 to be changed appropriately in response to environmental conditions such as the solar radiation angle M, thereby ensuring an appropriate amount of daylight from the opening of the building A1. Furthermore, with the daylighting equipment 10 of this embodiment, the amount of daylighting can be ensured without being restricted by the layout.

[0061] In the daylighting equipment 10 according to this embodiment, the two-story building A1 has a first opening B1 on the first floor and a second opening B2 on the second floor, the sensor 3 is disposed at a position adjacent to the first opening B1, and the eaves portion 13 protrudes from a position above the second opening B2. The state of the eaves portion 13 can be controlled based on the detection result of the sensor 3 so that a sufficient amount of daylight can be secured through the first opening B1 on the first floor.

[0062] Furthermore, in the daylighting equipment 10 according to this embodiment, the support arm 22 and the motor shaft 23 of the drive mechanism 2 change the protrusion amount L of the eaves portion 13, and the support arm 22 of the drive mechanism 2 changes the inclination K of the eaves portion 13. This allows the drive mechanism 2 to appropriately change the state of the eaves portion 13.

[0063] The control device 4 selects the optimal protrusion amount L and inclination K of the eaves portion 13 based on information such as the solar radiation angle M and the date and time at the location of the building A1, and controls the drive mechanism 2. This makes it possible to select and adjust the state of the eaves portion 13 so as to ensure an appropriate amount of lighting depending on the environmental conditions in the building A1, specifically, the external environmental conditions related to lighting.

[0064] As an example of use of the daylighting equipment 10 of this embodiment, a usage form in which the daylighting equipment 10 ensures the amount of daylight entering the first opening B1 has been described above, but the daylighting equipment 10 may be used for purposes other than ensuring the amount of daylight. For example, as shown in Fig. 12, one usage form of the daylighting equipment 10 may be to adjust the inclination K of the eaves portion 13 to cause the eaves portion 13 to totally reflect sunlight. This makes it possible to soften the incoming sunlight (sunlight) during periods when the intensity of the light entering the first opening B1 is high, such as in the summer.

[0065] In the above embodiment, the use form in which sunlight is refracted to the opening on the south side of the building A1 has been described, but the present invention is not limited to this. For example, as shown in Fig. 13, the daylighting equipment 10 may be installed on the north side of the building A1 to refract sunlight to the opening on the north side of the building A1. This makes it possible to ensure a sufficient amount of daylight through the opening even in the north part of the building A1. [Explanation of symbols]

[0066] A1 Building A2 Adjacent building B1 1st opening B2 2nd opening C Exterior wall D sun S System 1 Strip of sheet 2. Driving mechanism 3 Sensors 4. Control device 10 Daylighting equipment 11 Light-transmitting diffuser plate 12 Connecting hardware 13 Eaves 14 Roll section 21 Telescopic guide 22 Support arm 23 Motor shaft 24 Storage Case 25 Cylinder Part 26 Base tube member 27 Slit 100 Daylighting equipment

Claims

1. A lighting system installed in a building to adjust the amount of light entering through an opening in the building, A eaves portion protruding from an upper position of the opening to the outside of the building and configured by a light-transmitting diffusion plate; a drive mechanism for changing a protrusion amount of the eaves portion and an inclination of the eaves portion; A control device that controls the drive mechanism to adjust the protrusion amount and the inclination.

2. a sensor disposed adjacent to the opening and configured to output a signal in accordance with an amount of received light; The lighting facility according to claim 1 , wherein the control device controls the drive mechanism based on an output signal from the sensor.

3. The building is a multi-story building and has a first opening as the opening and a second opening provided on a floor higher than the first opening, The overhanging portion protrudes from a position above the second opening, The daylighting facility according to claim 2 , wherein the sensor is disposed adjacent to the first opening.

4. The daylighting facility according to claim 1 , wherein the control device controls the drive mechanism based on information on a location of the building and an angle of sunlight at a date and time.

5. The light-transmitting diffusion plate constituting the eaves portion is continuous in a strip shape, At least a part of the strip-shaped light-transmitting diffusion plate protrudes outward beyond the exterior wall of the building to form the eave portion; The daylighting device according to claim 1 , wherein the driving mechanism changes the amount of protrusion by changing a length of a portion of the strip-shaped light-transmitting diffusion plate that protrudes outward beyond the exterior wall as the eave portion.

6. The drive mechanism has a support arm that supports the overhanging portion, The support arm is installed in a state in which it can rotate around an axis along a horizontal direction, The daylighting facility according to claim 1 , wherein the drive mechanism changes the inclination by rotating the support arm.

7. The light gathering equipment according to any one of claims 1 to 6, wherein the control device controls the driving mechanism based on a combination of the protrusion amount and the inclination that satisfies a control condition for the optical path of sunlight refracted by the eave portion, and that results in the smallest protrusion amount.

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