JP2011154827A - Lighting system utilizing external light - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To keep illuminance of a lighting object unchanged even if external light fluctuates, in a lighting system utilizing external light. <P>SOLUTION: The lighting system utilizing external light 1 includes: a daylighting device 2 arranged near openings of a house and collects the external light; a light guide device 3 to perform light guiding of the collected light; an irradiation device 5 to irradiate the guided light to an irradiating object; a light-emitting device 6 to supplement the light of the irradiation device 5, by irradiation with supply of power; a brightness sensor 7 to measure brightness of the irradiating object; and a controlling device 8 to control an output of the light-emitting device 6 based on the measurement result of the brightness sensor 7 in order to keep the brightness of the irradiating object at a predetermined illuminance level. This keeps the illuminance at the irradiating object unchanged even if the external light fluctuates. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an illumination system using external light that collects external light, guides the collected light in a building, and uses it for illumination.

  Conventionally, there is an illumination system in which energy consumption is suppressed by effectively using external light for illumination. For example, external light is collected by a condensing member such as a convex lens or a concave mirror, and the collected light is made of acrylic. A rod that is guided and irradiated in a building is known (for example, see Patent Document 1). However, in such an illumination system, since the external light varies greatly depending on time and weather, the illumination intensity of the illumination target is not constant and the illumination is not comfortable. In addition, this illumination system once irradiates light collected by one light condensing member within a building, and further condenses the irradiated light by another light condensing member and relays it sequentially at a plurality of locations. Since the light is irradiated, there is a loss of light at the portion where the light is irradiated, and a portion where the light is not sufficiently irradiated is generated.

  There is also known an illumination system that guides outside light collected in a building by a light guide pipe having an inner peripheral surface as a reflection surface (see, for example, Patent Document 2). In this illumination system, an optical outlet is arranged at an arbitrary position in the light guide pump so that light can be irradiated at a plurality of locations. The optical outlet is opened at a position where light is irradiated and is closed at other positions. Loss of light is reduced by closing the optical outlet. However, in such an illumination system, the construction of the light guide pipe or the like is complicated, and the illuminance of the illumination target is not constant due to fluctuations in external light, and the illuminance changes depending on the number of light outlets to be opened.

  Also, an illumination system is known in which external light is collected by a blind-like member and the light is guided in a building using a reflecting mirror (see, for example, Patent Document 3). In this illumination system, since the guided light travels through the open space, it is necessary to accurately construct the reflecting mirror, and the construction is not easy. In addition, although illuminance correction by an artificial light source is briefly described, since the illuminance distribution in the building fluctuates due to slight altitude changes of the sun, large-scale illuminance correction using a plurality of illuminance detection means is necessary, It is not easy to put the system into practical use.

JP-A-6-76612 Japanese Patent Laid-Open No. 10-241430 JP 2005-166456 A

  An object of the present invention is to solve the above-described problem, and in an illumination system using external light, an object of the present invention is to prevent the illuminance of an illumination target from changing even if the external light changes.

  In order to achieve the above object, the invention of claim 1 is provided with a daylighting device that is arranged near the opening of a building and collects external light, a light guide device that guides light collected by the daylighting device, and An illumination device that irradiates an irradiation target with light guided by the light guide device, wherein the illumination system uses an external light separately from the illumination device to receive light and emit the light. A light-emitting device that compensates for light by the device, a brightness sensor that measures the brightness of the irradiation target, and the light-emitting device so that the brightness of the irradiation target becomes a predetermined illuminance based on a measurement result by the brightness sensor And a control device for controlling the output of.

  According to a second aspect of the present invention, in the illumination system using external light according to the first aspect, the light guide device condenses the light collected by the daylighting device, and the light is collected by the light collection unit. A light guide path that guides the emitted light and a branch unit that branches the light guided by the light guide path.

  According to a third aspect of the present invention, in the illumination system using external light according to the first or second aspect, the system includes a wiring duct that is arranged in the building and supplies power to the light emitting device, the brightness sensor, and the control device. The wiring duct has a housing portion that houses a part of the light guide device, and the irradiation device is connected to a part of the light guide device housed in the housing portion, and the wiring duct. It can be attached to.

  According to a fourth aspect of the present invention, in the illumination system using external light according to the third aspect, the brightness sensor is arranged apart from the irradiation device and the light emitting device via the control device.

  According to the first aspect of the present invention, even if the ambient light to be collected fluctuates, the light emitting device supplements the light from the irradiation device, so that the illuminance of the irradiation target does not fluctuate and constant illuminance is obtained. Therefore, it is possible to provide a practical illumination system using external light.

  According to the invention of claim 2, the light guide device condenses the collected light by the light collecting unit and then guides the light, so that the number of light guide paths can be reduced and the construction of the light guide paths becomes easy. . Further, the light quantity can be appropriately distributed to a plurality of irradiation devices by branching the guided light by the branch unit.

  According to the invention of claim 3, by providing the wiring duct, it is possible to construct the light guide device, the irradiation device, the light emitting device, the brightness sensor, and the control device without greatly affecting the interior surface of the building. . For this reason, it becomes easy to construct a lighting system using ambient light as a renovation work as well as a new construction work.

  According to the invention of claim 4, by arranging the brightness sensor away from the irradiating device and the light emitting device, it becomes difficult for direct light from the irradiating device and the light emitting device to enter the brightness sensor, and erroneous measurement of brightness. Is reduced.

The figure which shows the example of arrangement | positioning of the external light utilization illumination system which concerns on one Embodiment of this invention. The block block diagram of the system. The perspective view of the lighting apparatus and light guide device in the system. Sectional drawing of the lighting unit in the lighting device. Sectional drawing of the modification of the lighting unit. The perspective view of the structure which supports the said lighting unit. Sectional drawing of the modification of the light guide device in the said system. Sectional drawing of another modification of the light guide device. Sectional drawing of another modification of the light guide device. The perspective view of the wiring duct in the said system. The perspective view of the lighting fixture attached to the wiring duct. Sectional drawing of the irradiation apparatus in the lighting fixture.

  An illumination system using external light according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 and 2, an external light utilization illumination system 1 (hereinafter referred to as an illumination system) includes a daylighting device 2 that collects external light and a light guide that guides light collected by the daylighting device 2. It has the apparatus 3 and the lighting fixture 4 which illuminates using the light guided by the light guide apparatus 3. FIG. The daylighting device 2 is arranged in the vicinity of the opening W of the building H. The luminaire 4 includes an irradiation device 5 that irradiates an irradiation target with light guided by the light guide device 3. The irradiation target is, for example, the floor surface F in the building H.

  The light guide device 3 includes a light collecting unit 31, a light guide optical fiber 32 as a light guide path, and a branch unit 33. The light guide path may be a light guide tube or a light guide plate instead of the light guide optical fiber 32. The condensing unit 31 condenses the light collected by the lighting device 2. The light guide optical fiber 32 guides the light collected by the light collecting unit in the building H. The branch unit 33 branches the light guided by the light guide optical fiber 32. The irradiation device 5 irradiates the light branched by the branch unit 33.

  The lighting fixture 4 has a light emitting device 6 separately from the irradiation device 5. The light emitting device 6 is supplied with electric power and emits light to supplement the light emitted from the irradiation device 5. The luminaire 4 includes a brightness sensor 7 that measures the brightness of the irradiation target, and a control device 8 that controls the output of the light emitting device 6. The control device 8 controls the output of the light emitting device 6 so that the brightness of the irradiation target becomes a predetermined illuminance based on the measurement result obtained by the brightness sensor 7.

  The form of the structural frame of the building H is a reinforced concrete structure, a steel frame structure, a wooden structure, or the like. The use of the building H is not limited to offices, stores, houses, and the like. The opening W is a portion through which external light in the building H is transmitted, and is generally a window portion. The vicinity of the opening W is a part where external light incident from the opening W can be received, for example, a part facing a window sill, a window frame, and a glass shoji. For example, the daylighting device 2 is installed in the building H so as to collect outside light through a window.

  As shown in FIGS. 3 and 4, the daylighting apparatus 2 includes a plurality of daylighting units 21 and a casing box 22. The casing box 22 has the same number of holes 224 as the number of daylighting units 21. The daylighting unit 21 is supported by a support shaft 23 that passes through the hole 224 and protrudes from the casing box 22. The daylighting unit 21 includes a frustoconical casing 211 having a large-diameter opening 211a and a small-diameter opening 211b, and a daylighting lens 212 provided in the large-diameter opening 211a of the casing 211. The daylighting lens 212 is a convex lens. The daylighting unit 21 is arranged such that the daylighting lens 212 faces the incident direction of external light. One end of the daylighting optical fiber 24 is inserted into the small-diameter opening 211b. The daylighting optical fiber 24 is fastened and fixed to the casing 211 with a nut 214 via a seal 213. The daylighting lens 212 has a focal point at the end of the daylighting optical fiber 24, refracts the incident external light, and enters the end of the daylighting optical fiber 24. The daylighting optical fiber 24 is a general-purpose fiber having a multilayer structure of a core and a clad made of acrylic resin having different refractive indexes, and may be one using an inorganic material such as quartz. The other end of the daylighting optical fiber 24 is drawn from the end surface of the casing box 22 via the inside of the casing box 22 and connected to the light collecting unit 31. The casing box 22 has ribs 221 extending at both ends of the casing box 22. The casing box 22 is fixed by screwing the rib 221 to the window frame or the like. The casing box 22 may be fixed by tape-bonding the rib 221 and hanging it with a hook.

  FIG. 5 shows a modification of the daylighting unit 21. The daylighting unit 21 has a fiber fusion type optical coupler 215 in the casing 211 instead of the convex lens. The fiber-melting type optical coupler 215 is obtained by bundling a large number of optical fibers, locally heating one end, melting and stretching, and reducing the diameter. Since ordinary fiber fusion type optical couplers combine optical signals, the number of optical fibers bundled in order to maintain the transmission quality of the optical signal is about several, but this fiber fusion type optical coupler Since 215 only needs to combine optical energy, 215 is made by bundling a larger number of optical fibers. The small diameter end 215 b of the fiber fusion type optical coupler 215 is connected to the optical fiber 24 for daylighting. External light that has entered the large-diameter end 215 a of the fiber-melting optical coupler 215 travels through the melting-type optical coupler 215 and enters the daylighting optical fiber 24. An infrared cut filter 216 is provided in the large-diameter opening 211 a of the casing 211. The infrared cut filter 216 blocks infrared rays contained in external light and prevents overheating of the fiber fusion type optical coupler 215 and the daylighting optical fiber 24.

  FIG. 6 shows a configuration for supporting the daylighting unit 21. The support shaft 23 is erected on a support plate 25 in the casing box 22 so as to be rotatable, and has a worm wheel 231. The worm wheel 231 is engaged with the worm 251. The worm 251 is rotated by a motor 252 attached on the support plate 25. With the rotation of the motor 252, the support shaft 23 is rotated as indicated by the arrow A1 via the worm 251 and the worm wheel 231, and the daylighting unit 21 is rotated. By turning the daylighting unit 21, the orientation of the large-diameter opening 211a in the horizontal plane, that is, the yaw angle of the daylighting unit 21 is adjusted. Instead of the worm wheel 231 and the worm 251, a rack and pinion may be used.

  The support plate 25 is rectangular and is slidably held with respect to the casing box 22 at one end by the guide rail 222 and at the other end by the electric slider 223. The support shaft 23 has a universal joint 232 at a portion inside the casing box 22, and protrudes out of the casing box 22 from a hole 224 of the casing box 22. When the support plate 25 is slid as indicated by the arrow A2, the support shaft 23 tilts with the hole edge of the hole 224 of the casing box 22 as a fulcrum. By the tilting of the support shaft 23, the direction in the vertical plane of the large-diameter opening 211a of the daylighting unit 21, that is, the pitch angle of the daylighting unit 21 is adjusted. The change in the yaw angle accompanying the adjustment of the pitch angle is corrected by the rotation of the support shaft 23. Instead of the guide rail 222, a linear guide may be used. Further, instead of the electric slider 223, a rack and pinion and a motor may be used.

  The configuration for supporting the daylighting unit 21 is not limited to the above configuration as long as the yaw angle and pitch angle of the daylighting unit 21 can be adjusted. For example, the configuration of the daylighting unit 21 between the daylighting unit 21 and the support shaft 23 is not limited. A mechanism for adjusting the pitch angle may be provided.

  The motor 252 and the electric slider 223 are controlled by a control circuit (not shown) provided in the casing box 22. When the daylighting unit 21 has the daylighting lens 212, it is desirable to perform tracking control of the daylighting unit 21 by the control circuit so that the daylighting lens 212 faces the sun. For example, the control circuit calculates the sun position on the celestial sphere based on the date and time and the latitude and longitude at which the daylighting device 2 is installed, and performs tracking control of the daylighting unit 21. The daylighting unit 21 having the daylighting lens 212 mainly collects direct sunlight as outside light when tracking control is performed, and mainly sky light as outside light when tracking control is not performed. The efficiency of daylighting is higher when daylight is taken. When the daylighting unit 21 has the fiber fusion type optical coupler 215, the daylighting unit 21 can be efficiently daylighted without accurately tracking control, and for example, adjustment of the pitch angle of the daylighting unit 21 is omitted. May be.

  Since each of the plurality of daylighting units 21 has the daylighting optical fiber 24, the light collected by the daylighting device 2 enters the light guide unit 3 through the plurality of daylighting optical fibers 24 (see FIG. 3). ). The condensing unit 31 of the light guide device 3 condenses the incident light onto the light guide optical fibers 32 that are smaller in number than the light collecting optical fibers 24 and outputs the light. The light guide optical fiber 32 guides light. The light guided by the light guiding optical fiber 32 enters the branch unit 33. The branching unit 33 splits the incident light into a number of branching optical fibers 34 larger than the number of light guiding optical fibers 32 and outputs the branched light. The number of light guiding optical fibers 32 is one in principle. The light guiding optical fiber 32 and the branching optical fiber 34 are general-purpose fibers having a multilayer structure of a core and a clad made of acrylic resin having different refractive indexes, and may be made of an inorganic material such as quartz.

  The condensing unit 31 includes a casing 311 having a light entrance side opening and a light exit side opening, and a concave mirror 312. The daylighting optical fiber 24 is inserted into the light entrance side opening, and is fixed to the casing 311 with a nut via a seal. A branching optical fiber 34 is inserted into the light exit side opening, and is fixed to the casing 311 with a nut via a seal. The concave mirror 312 collects the light incident from the daylighting optical fiber 24 and enters the end of the light guiding optical fiber 32.

  The branch unit 33 includes a casing 331 having a light incident side opening and a light exit side opening, and a convex mirror 332 for diffusion. A light guide optical fiber 32 is inserted into the light incident side opening, and is fixed to the casing 331 with a nut via a seal. A branching optical fiber 34 is inserted into the light exit side opening, and is fixed to the casing 331 with a nut via a seal. The convex mirror 332 diffuses the light incident from the light guiding optical fiber 32 and enters the end of the branching optical fiber 34.

  As shown in FIG. 7, the light collecting unit 31 may have a convex lens 313 instead of the concave mirror. The convex lens 313 collects the light incident from the plurality of daylighting optical fibers 24 and enters the end portion of one light guiding optical fiber 32. Further, the branch unit 33 may include a concave lens 333 instead of the convex mirror. The concave lens 333 diffuses the light incident from the light guiding optical fiber 32 and enters the ends of the plurality of branching optical fibers 34.

  Further, as shown in FIG. 8, the light collecting unit 31 may include an optical coupler 314 based on a butt connection. The optical coupler 314 is configured by connecting a plurality of daylighting optical fibers 24 to a core portion of one light guiding optical fiber 32. As the light guide optical fiber 32, one having a diameter larger than that of the daylighting optical fiber 24 is used. The optical coupler 314 enters the light incident from the daylighting optical fiber 24 into the end portion of the light guiding optical fiber 32. Further, the branching unit 33 may have an optical branching device 334 by butt connection. The optical branching device 334 is configured by connecting the core portion of one light guiding optical fiber 32 to a plurality of branching optical fibers 34. The optical branching device 334 enters the light incident from the light guiding optical fiber 32 into the end of the branching optical fiber 34.

  Further, as shown in FIG. 9, the light collecting unit 31 may include a fiber melting type optical coupler 315. The fiber fusion type optical coupler 315 enters the light incident from the plurality of light-collecting optical fibers 24 into the end portion of one light guide optical fiber 32. Further, the branch unit 33 may include a fiber fusion type optical branching device 335. The fiber fusion type optical branching device 335 enters the light incident from one light guiding optical fiber 32 into a plurality of branching optical fibers 34.

  As described above, the light guide device 3 collects the collected light by the light collecting unit 31 and then guides the light. Therefore, the number of the light guide optical fibers 32 as the light guide path is small, and the light guide device 3 Construction of the optical fiber 32 becomes easy. Moreover, the light quantity can be appropriately distributed to the plurality of irradiation devices 5 by branching the guided light by the branch unit 33.

  As shown in FIGS. 10 and 11, each end of the branching optical fiber 34 is connected to the irradiation device 5 via the inside of the wiring duct 9. The wiring duct 9 is disposed on the ceiling surface of the building and supplies power to the light emitting device 6, the brightness sensor 7, and the control device 8. Further, the wiring duct 9 has a housing portion 91 that houses the branching optical fiber 34 that is a part of the light guide device 3. The luminaire 4 is attached to the wiring duct 9.

  The wiring duct 9 includes a long body 92 having a substantially U-shaped cross section that opens downward as a basic structural member. The elongated body 92 has a bottom surface portion 93 and a side surface portion 94. The side surface portion 94 has a pair of extending pieces 95 extending upward from the bottom surface portion 93. The extension piece 95 and the bottom surface portion 93 form an accommodating portion 91 for accommodating the branching optical fiber 34. On the opening side of the elongate body 92, there are a plurality of extending pieces 96 a, 96 b, 96 c that extend inward substantially parallel to the bottom surface portion 93. The two pairs of extending pieces 96 a and 96 b form a groove-like engaging portion 96 d for attaching the lighting fixture 4. Further, the wiring duct 9 has a pair of conductors 97 for supplying power to the lighting fixture 4. The conductor 97 is held by two pairs of extending pieces 96b and 96c near the engaging portion 96d. The bottom surface portion 93 has openings 98 at regular intervals in the longitudinal direction. The branching optical fiber 34 is drawn out from the accommodating portion 91 through the opening 98. Further, the bottom surface portion 93 has a reinforcing portion 99 a that is built up between the opening 98 and the opening 98. The reinforcement part 99a has a screw hole. The wiring duct 9 is fixed to the building by screws 99b.

  The luminaire 4 has a mounting portion 41 that is assembled with the receiving portion 96 d of the wiring duct 9. The engaging portion 41 includes a shaft portion 42 provided on the outer periphery of the lighting fixture 4, and two rotating pieces 43 and 44 that are rotatably disposed at the end of the shaft portion 42 and rotate integrally. Have. One rotation piece 43 is mechanically assembled with the engaging portion 96d by rotation. The other rotating piece 44 has a power receiving electrode 45. When the rotating piece 43 is mechanically assembled with the engaging portion 96d, the power receiving electrode 45 is in electrical contact with the conductor 97 of the wiring duct 9.

  Thus, by providing the wiring duct 9, the light guide device 3, the irradiation device 5, the light emitting device 6, the brightness sensor 7, and the control device 8 can be constructed without greatly affecting the interior surface of the building. I can do it. For this reason, it becomes easy to construct the lighting system 1 as a repair work as well as a new work.

  The luminaire 4 integrally includes an irradiation device 5, a light emitting device 6, a brightness sensor 7, and a control device 8. The irradiation device 5 may not be integrated with the light emitting device 6 or the like but may be supported by a single joint (not shown). This joint has a multi-axis rotation mechanism, and can rotate in a vertical plane and a horizontal plane. You may comprise so that it may move.

  As shown in FIG. 12, the irradiation device 5 includes a casing 51 having a light incident side opening 51a and a light output side opening 51b, and a diffusing concave lens 52. A branching optical fiber 34 is inserted into the light incident side opening 51a and is fixed to the casing 51 with a nut via a seal. The diffusing concave lens 52 is disposed in the light output side opening 51 b of the casing 51. The light emitted from the branching optical fiber 34 is diffused and irradiated by the diffusing concave lens 52.

  The light emitting device 6 is disposed adjacent to the irradiation device 5 (see FIG. 11). The light emitting device 6 includes an LED package as a light source and an optical member that distributes light emitted from the LED package, and the output is controlled by the control device 8.

  The brightness sensor 7 has a pyroelectric element and a control element. The pyroelectric element is set so that the irradiation target of the irradiation device 5 and the light emitting device 6, for example, the floor surface, is the detection target, and the brightness is detected by the reflected light from the irradiation target. The control element divides the output voltage of the pyroelectric element by a threshold value or amplifies the pyroelectric element by an appropriate range, thereby converting the output voltage into an illuminance signal and transmitting the result to the control device 8 as a measurement result. The brightness sensor 7 is spaced from the irradiation device 5 and the light emitting device 6 via the control device 8.

  Such an arrangement of the brightness sensor 7 makes it difficult for direct light from the irradiation device 5 and the light emitting device 6 to enter the brightness sensor 7, thereby reducing erroneous brightness measurement.

  The control device 8 includes an AC / DC converter and an arithmetic circuit. The AC / DC converter converts the AC voltage received by the power receiving electrode 45 from the conductor 97 of the wiring duct 9 into a DC voltage, steps down the voltage, and supplies power to the arithmetic circuit of the control device 8, the light emitting device 6, and the brightness sensor 7. . The arithmetic circuit has a memory, a timer for measuring time, and the like, and controls the output of the light emitting device 6 so that the brightness of the irradiation target becomes a predetermined illuminance based on the measurement result by the brightness sensor 7. The predetermined illuminance is, for example, a value stored in advance in a memory or a value defined by time.

  In the illumination system 1 configured as described above, the illuminance of the irradiation target does not fluctuate and constant illuminance is obtained because the light emitting device 6 supplements the light from the irradiating device 5 even if the ambient light to be collected fluctuates. It is done.

  In addition, this invention is not restricted to the structure of said embodiment, A various deformation | transformation is possible in the range which does not change the summary of invention. For example, a shutter may be provided between the branching optical fiber 34 and the diffusing concave lens 52 of the irradiation device 5 so that the shutter is closed when the lighting fixture 4 is turned off.

DESCRIPTION OF SYMBOLS 1 External light utilization illumination system 2 Daylighting device 3 Light guide device 31 Condensing unit 32 Light guide optical fiber (light guide path)
33 Branch unit 34 Optical fiber for branching (part of the light guide device)
5 Irradiation device 6 Light-emitting device 7 Brightness sensor 8 Control device 9 Wiring duct 91 Housing part F Floor surface (irradiation target)
H Building W Opening

Claims (4)

A lighting device that is arranged near the opening of a building and that collects external light, a light guide device that guides light collected by the lighting device, and light that is guided by the light guide device is irradiated. An illumination system using external light, and an irradiation device for irradiating,
Separately from the irradiation device, a light emitting device that receives power supply to emit light and supplements the light from the irradiation device;
A brightness sensor for measuring the brightness of the irradiation target;
And a controller for controlling the output of the light-emitting device so that the brightness of the irradiation target becomes a predetermined illuminance based on the measurement result of the brightness sensor. . The light guide device includes:
A light collecting unit for collecting the light collected by the daylighting device;
A light guide for guiding the light collected by the light collecting unit;
The illumination system using external light according to claim 1, further comprising: a branching unit that branches light guided by the light guide path. Arranged in the building, having a wiring duct for supplying power to the light emitting device, brightness sensor and control device,
The wiring duct has a housing portion that houses a part of the light guide device,
3. The illumination system using external light according to claim 1, wherein the irradiation device is connected to a part of the light guide device accommodated in the accommodating portion and attached to the wiring duct. .   The illumination system using external light according to claim 3, wherein the brightness sensor is disposed apart from the irradiation device and the light emitting device via the control device.

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