JP5920794B2 - Solar lighting device - Google Patents

Description

  The present invention relates to a solar lighting device that irradiates indoors sunlight collected by a solar collector installed outdoors.

2. Description of the Related Art Conventionally, there has been proposed a solar lighting device that guides light indoors with a light guide (optical fiber) from a condenser equipped with a solar light tracking device installed outdoors (see Patent Document 1).
In general, a quartz light guide with excellent weather resistance is used as the light guide. However, if a large amount of light is to be introduced, the effective diameter of the core must be increased. A quartz light guide with a large aperture is extremely expensive. is there.

For this reason, a solar illumination device using a liquid core light guide capable of transmitting a large amount of light at low cost has been proposed instead of quartz fiber (see Patent Document 2).
However, the liquid core light guide is inferior in weather resistance to the quartz light guide, and can only be used in an environment of −10 ° C. to + 35 ° C.
In addition, when light is guided indoors with a liquid core ride guide from an outdoor concentrator, the light loss increases when attempting to divide the light obtained by the concentrator, so it is possible to branch freely, such as 2-branch / 3-branch It becomes difficult to make.

Japanese Patent Laid-Open No. 06-300925 Japanese Patent Laid-Open No. 06-174930

  Then, this invention makes it a inherent problem to provide the solar light illuminating device which is cheap, is excellent in a weather resistance, and can branch light with low loss.

In order to solve this problem, the present invention extends from a solar concentrator installed outdoors, guides sunlight through a light guide drawn indoors from the outdoors, and emits light installed indoors. In a solar lighting device that irradiates from the end and performs indoor lighting,
The light guide, the light guide and the collector side is divided into the light guide of the light emitting end side, together with the connection point connecting these is provided indoors, as the light guide, outdoors from the collector A quartz light guide is used in a portion that is laid and reaches the connection point, and a liquid core light guide is laid between the connection point and the light emitting end.

According to the present invention, a quartz light guide having excellent weather resistance is used between a light collector and an indoor connection point as a light guide for guiding light from an outdoor light collector to an indoor light emitting end. An inexpensive liquid core light guide is used between the indoor connection point and the light emitting end, although the weather resistance is inferior.
Since the quartz light guide having excellent weather resistance is laid on the part exposed outdoors, the light guide does not deteriorate even under severe use environment.
In addition, the liquid core light guide, which is inferior in weather resistance, is laid on the indoor side where it is not exposed to wind and rain, direct sunlight (ultraviolet rays), etc., and thus is not easily affected by the severe outdoor environment.
Furthermore, it is sufficient to lay an expensive quartz light guide only for a short distance from the condenser to the connection point, and even if the distance from the connection point to the light emitting end is long, an inexpensive liquid core light guide can be used. Overall equipment costs can be reduced.

  Furthermore, because the quartz light guide is drawn to the connection point, the quartz light guide is connected to the optical input port of an optical branching device such as a multi-branch optical fiber, and the liquid core light guide is connected to multiple optical output ports. In this case, it is not necessary to branch the liquid core light guide, so that it can be easily branched with low loss.

Explanatory drawing which shows an example of the sunlight illuminating device which concerns on this invention. Explanatory drawing which shows the connection state of a quartz light guide and a liquid light guide. Explanatory drawing which shows the other Example which concerns on this invention. Explanatory drawing which shows the principal part.

The present invention extends from a solar concentrator installed outdoors, guides sunlight through a light guide that is drawn indoors from the outdoors, and irradiates it from a light emitting end installed indoors for indoor lighting. In order to achieve the problem that the solar lighting device to be performed is inexpensive, excellent in weather resistance, and capable of branching light with low loss, the light guide includes a light guide on the collector side and a light emission Divided into light guides on the end side, and connection points connecting them are provided indoors, and as the light guides, quartz light guides are used in the part that is laid outside from the condenser and reaches the connection points , A liquid core light guide was laid between the connection point and the light emitting end.

A solar lighting device 1 shown in FIG. 1 includes a light emitting end 5 installed indoors through a light guide 4 from a solar concentrator 3 installed on a roof 2 of a residence or a roof of a condominium / office building. Sunlight is introduced until indoor lighting.
The solar light collector 3 has a Fresnel condensing lens 7 attached to a condensing opening of a biaxially driven solar automatic tracking device 6, and a light incident end (not shown) of the light guide 4 at the condensing point position. ) Is attached.

  When installing the solar concentrator 3 on the roof of an existing building, the drawing hole 9 of the light guide 4 is provided in the wall 8 and the light guide 4 extended from the solar collector 3 is drawn in. Since it is a general construction method to draw in from 9 indoors, a part of the light guide 4 is always exposed to the outdoors where the use environment is severe.

Therefore, the light guide 4 is divided into a light guide on the condenser 3 side and a light guide on the light emitting end 5 side, and a connection point P for connecting them is provided indoors.
Further, a quartz light guide 11 serving as the light guide 4 on the condenser 3 side is laid between the condenser 3 and the connection point P, and the light emission end 5 is connected between the connection point P and the light emission end 5. A liquid core light guide 21 serving as the side light guide 4 was laid.

In the quartz light guide 11, as shown in FIG. 2A, the core 12 and the clad 13 are made of quartz, the outermost layer is covered with a jacket 14, and the core diameter is selected to be, for example, 6 mm.
A connector pipe 16 is attached to the light emitting end 15 of the quartz light guide 11, and a male screw 17 that is screwed into a lock nut 28 of the liquid core light guide 21 is formed on the outer peripheral surface thereof.

As shown in FIG. 2A, the liquid core light guide 21 is filled with a light guide liquid 23 serving as a core in a hollow portion of a support tube 22 having an inner diameter of about 10 mm, and both ends thereof are sealed with a translucent plug 24. The outermost layer is covered with a jacket 25.
A flange pipe 27 is attached to the light incident end 26, a lock nut 29 that engages with the flange 28 of the flange pipe 27 and can be rotated around the flange pipe 27 is provided on the inner peripheral surface of the lock nut 29. Is formed with a female screw 30 which is screwed with the male screw 17 of the connector pipe 16.

As shown in FIG. 2B, the quartz light guide 11 and the liquid core light guide 21 are connected at a connection point P provided indoors (for example, in a ceiling slab), and the lock nut 21 is screwed to the connector pipe 16. By tightening, the end face of the permeable plug 24 of the liquid core light guide 21 and the core end face of the quartz light guide 11 are brought into close contact and optically connected.
At this time, since the core diameter of the liquid core light guide 21 (inner diameter of the hollow portion of the support pipe 22) is larger than the core diameter of the quartz light guide 11, there is no light leakage at the connection point P and transmission loss is small.

  Moreover, the liquid core light guide 21 is extended to the room which is going to irradiate sunlight, and the arbitrary light fixture is provided in the light emission end 5. In this example, a light diffusion plate 31 for diffusing and irradiating light is provided.

The above is one configuration example of the present invention, and the operation thereof will be described next.
When the solar light collector 3 is installed on the roof 2 of the house, the quartz light guide 11 is laid from the solar light collector 3 and is pulled to the connection point P through the drawing hole 9 provided in the wall 8.
A room where the connector pipe 16 provided at the light emitting end 15 of the quartz light guide 11 and the light incident end 26 of the liquid core light guide 21 are connected at the connection point P, and sunlight illumination such as a basement that is not exposed to sunlight is performed. Extend to.

  Thereby, the light incident on the solar light collector 3 is incident on the quartz light guide 11 by the condenser lens 7 and guided to the connection point P, and the light is transmitted through the liquid core light guide 21 connected thereto. The light is emitted from the emission end 5, and sunlight is irradiated into the basement.

At this time, the portion of the light guide 4 exposed to the outside is laid with the quartz light guide 11 having excellent weather resistance, so that it may deteriorate even if it is exposed to wind and rain or direct sunlight (ultraviolet rays). Absent.
In addition, if the connection point P is provided in the immediate vicinity of the lead-in hole 9, the expensive quartz light guide 11 only needs to be laid down to the connection point P, so that it is short, and the cost of the light guide 4 can be reduced.

Moreover, since the liquid core light guide 21 inferior in weather resistance is laid indoors from the connection point P to the light emitting end 5, it is not exposed to wind and rain or direct sunlight (ultraviolet rays) and is not easily deteriorated.
Furthermore, since the liquid core light guide 21 is inexpensive, the cost does not increase even if the distance from the connection point P to the light emitting end 5 is long.

FIG. 3 is an explanatory view showing another embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the part which is common in FIG. 1, and the detailed description is abbreviate | omitted.
The sunlight illuminating device 41 of this example is provided with a plurality of light emitting ends 5 so that the light condensed by the condenser 3 is emitted at a plurality of locations.
At the connection point P, an optical branching device 42 for branching and outputting sunlight introduced by the quartz light guide 11 is disposed.

  As shown in FIG. 4, the optical branching device 42 is formed by randomly branching one end side of a large-diameter bundle fiber 43 in which quartz fibers are bundled into a plurality of small-diameter bundle fibers 44. The end is formed as a light input port 45 for connecting the quartz light guide 11, and the end on the small diameter bundle fiber 44 side is formed as a light output port 46 for connecting the liquid core light guide 21.

  Therefore, the quartz light guide 11 laid between the concentrator 3 and the connection point P is connected to the light input port 45 of the optical branching device 42 installed at the connection point P, and the connection point P and the light emitting end 5 are connected. If the light incident ends 26 of the plurality of liquid core light guides 21 laid between the two are connected to the light output port 46 of the optical branching device 42, the quartz light guide 11-the optical branching device 42-the liquid core light guide 21 Optically communicating as a light guide 4 from the light collector 3 to the light exit end 5, the sunlight condensed by the light collector 3 is irradiated from each light exit end 5 with a uniform light intensity.

Also in this case, since the quartz light guide 11 having excellent weather resistance is laid between the condenser 3 and the connection point P, a portion of the light guide 4 exposed to the outdoors is deteriorated depending on the use environment. The optical performance is unlikely to deteriorate.
Further, since the expensive quartz light guide 11 has only to be laid for a short distance from the condenser 3 to the connection point P, the equipment cost can be reduced.

Furthermore, although the liquid core light guide 21 having poor weather resistance is laid between the connection point P and the light emitting end 5, it is laid on a portion of the light guide 4 that is not exposed to the outside. And its optical performance is less likely to deteriorate.
Furthermore, even if the distance from the connection point P to the light emitting end 5 is long, the liquid core light guide is relatively inexpensive, so that the equipment cost can be reduced.

  INDUSTRIAL APPLICABILITY The present invention can be used as a solar lighting device that guides sunlight collected outdoors to use indoors as illumination.

DESCRIPTION OF SYMBOLS 1 Sunlight illuminating device 2 Roof 3 Sunlight collector 4 Light guide 5 Light emitting end 6 Solar automatic tracking device 7 Fresnel condensing lens P Connection point 11 Quartz light guide 21 Liquid core light guide

Claims (3)

Sunlight lighting that extends from a solar concentrator installed outdoors, guides sunlight through a light guide drawn indoors from the outdoors, and irradiates it from the light exit end installed indoors to provide indoor lighting In the device
The light guide is divided into a light guide on the condenser side and a light guide on the light emitting end side, and a connection point for connecting them is provided indoors ,
As the light guide, a quartz light guide is used in a portion that is laid outdoors from the condenser and reaches the connection point ,
A solar lighting apparatus, wherein a liquid core light guide is laid between the connection point and the light emitting end. The liquid core light guide, the tube distal opening for filling the light liquid is sealed in the translucent plug equal to the core diameter, the end surface and the quartz light guide core end face is the connection point of the translucent plug in the butt connection, the core diameter of the liquid core light guide, the quartz light guides solar lighting apparatus of large selection claims 1, wherein from the core diameter. The quartz light guide optical splitter for branching outputs the introduced sunlight from a plurality of optical output port is disposed in the connection point, the liquid core, which is laid between the plurality of light emitting end from the connection point The solar light illuminating device according to claim 1, wherein a light guide is connected to each of the optical output ports of the optical splitter.

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