JPH0757526A - Sunlight collecting device and manufacture thereof - Google Patents

Abstract

PURPOSE:To provide a sunlight collecting device hating a wide correspondence property and a simple structure and free of maintenance over a long period by laminating a transparent surface plate on a flat plate-like reflecting mirror member having a mirror finished surface layer, and burying light collecting fibers in many parallel grooves formed on the contact surface. CONSTITUTION:A reflecting mirror member 3 made of transparent plastic and having a mirror finished surface layer 13a is arranged on an opaque base plate 13, and a transparent surface plate 8 is laminated on it. Many grooves are formed in parallel on one or both of the contact surfaces, and the light collecting fibers F are buried in the grooves respectively. The cross section of the mirror finished surface layer 3a perpendicular to the grooves is preferably made part of the involute of a curve as the cross sectional outer periphery of the light collecting fibers F. The light collecting fibers F can be made adaptable to roofs of unspecified shapes, they can withstand outdoor installation over a long period, and a sunlight collecting device having good light collection efficiency is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sunlight collecting device for collecting sunlight for indoor lighting, for example, and a method for manufacturing the same.

[0002]

2. Description of the Related Art As a sunlight collecting device, in addition to a conventional lighting window and a skylight for directly collecting sunlight, a device for further transmitting the collected light, for example, a combination of reflecting mirrors and an optical duct are used. Some have been put into practical use, some of which are guided indoors with optical fibers.

In this type of sunlight collecting device, the end face of the optical fiber is arranged at the focal position of the Fresnel lens, and the sun tracking device is used to collect light with the end faces of the Fresnel lens and the optical fiber always directed in the direction of sunlight. The method is excellent in principle because the efficiency of daylighting and light guiding is high, there are few restrictions on the installation place of the daylighting device, and furthermore, the light can be guided to a necessary place indoors. However, in this method, it is necessary to additionally drive a complicated and expensive solar tracking device,
Moreover, it is possible to illuminate only the direct sunlight from the sun, and it is impossible to illuminate the heavenly light other than the directional light which occupies a considerable part of the total heavenly light, and it is of little use in cloudy weather.

As an alternative sunlight collecting device, there has been devised a device for collecting sunlight by using an optical fiber as a material for directly collecting sunlight without providing a sun tracking device. For example, Japanese Patent Application Laid-Open No. 3-59901 discloses a solar lighting device which uses a combination of a light wavelength conversion plastic fiber added with a fluorescent substance as a lighting material and can perform lighting in a fixed manner.

[0005]

However, in the conventional solar light collecting device using the optical fiber of the optical excitation type, among the light generated by excitation in the optical fiber, the amount of sunlight projected on the side surface of the optical fiber is The amount of light that reaches one end surface of the sampling optical fiber is only within about 1.5%, and even if the light is collected from both end surfaces of the sampling optical fiber, it is 3% of the amount of sunlight projected on the side surface of the sampling optical fiber.
It is difficult to obtain the amount of light that exceeds.

[0006] Therefore, in the sunlight collecting device using the optical fiber of the photoexcitation system, even if the device is of the smallest scale, the diameter of 1
It is necessary to have a precise structure in which hundreds of optical fibers of ~ 2 mm are arranged in parallel. In such a situation, in the mass production type solar lighting device used for general homes, buildings, and factories, how to assemble the lighting device with the above-mentioned configuration in a short time with little labor, and also for ridges of unspecified shape An important issue was how to design a structure that would be installed, maintenance-free, and durable for long-term use. In order to solve such a problem, the structure should be as thin and lightweight as possible, a closed structure in which moisture or the like does not enter the inside of the daylighting device from the outside, and further, it should withstand repeated day and night temperature changes. It is desired to be a structure.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a solar lighting device which can cope with an unspecified roof shape, has a simple structure, and is maintenance-free for a long period of time. It is to provide the manufacturing method.

[0008]

According to the first aspect of the present invention, there is provided a sunlight collecting device including a flat reflecting mirror member having a mirror layer.
It is composed of a transparent surface plate laminated on the reflecting mirror member and a plurality of sampling optical fibers provided between the reflecting mirror member and the transparent surface plate. A large number of grooves are formed in parallel in one or both of them, and each sampling optical fiber is embedded in the grooves.

A method of manufacturing a solar lighting device according to claim 3 is
A large number of sampling optical fibers are stretched in parallel, and a reflecting mirror having a number of parallel grooves is placed on one side across the sampling optical fiber row so that the grooves face each sampling optical fiber, and on the other side. , A transparent surface plate having a large number of parallel grooves is arranged so that the grooves face each sampling optical fiber,
By simultaneously crimping the reflecting mirror and the transparent surface plate via the sampling optical fiber, the sampling optical fiber is pushed into each groove of the reflecting mirror and the transparent surface plate to bring the reflecting mirror and the transparent surface plate into close contact. To do.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 are perspective views showing manufacturing steps of the sunlight collecting device of the present invention. First, in FIG. 1, reference numerals 1 and 2 denote supply roller conveyors for supplying a reflecting mirror 3 to an assembly position. The reflecting mirror 3 is first conveyed by the supplying roller conveyor 1 in the direction of arrow A, and then the supplying roller conveyor 2 Is conveyed in the direction of arrow B by the guide 4 during conveyance.
And 5 are positioned at a predetermined position. The supply roller conveyor 2 is composed of two roller conveyors 2a and 2b, and the roller conveyor 2b located below the sampling optical fiber row F is configured to be able to move up and down. Hereinafter, it is referred to as an elevating roller conveyor 2b. Reference numeral 6 denotes a sending roller conveyor for sending the assembled lighting unit to the next step. Along the sending roller conveyor 6, a large number of collecting optical fibers F unwound from the collecting optical fiber bobbin 7 are mutually It is stretched in parallel with the necessary spacing.

The reflecting mirror 3 is formed of a flat plate in which an opaque layer as a base plate and a transparent layer are laminated, a mirror surface layer is provided at the boundary between the layers, and the transparent layer surface has the same number as the optical fibers F in parallel. It has a large number of grooves, and the cross-sectional shape of each groove is formed in a semicircular shape, and the groove width is formed slightly larger than the diameter of the sampled optical fiber F.

When the reflecting mirror 3 having the above-mentioned structure is supplied onto the elevating roller conveyor 2b and the reflecting mirror 3 is stopped by a stopper (not shown), the guide 5 accurately determines the position of each groove. It corresponds to the optical fiber F.

On the other hand, the transparent surface plate 8 is adsorbed to the overhead crane 9 by the four suction cups 9a and conveyed to above the sampling optical fiber F. The transparent surface plate 8 has
The optical fiber F has a large number of parallel grooves, the cross-sectional shape of which is semicircular, and the groove width is slightly larger than the diameter of the optical fiber F.

The transparent front plate 8 having such a structure descends along the four arc-shaped guides 10 so that it is positioned above the stretched optical fiber F and is already positioned and waiting. It is positioned at a position facing 3.

Next, as shown in FIG. 2, the elevating roller conveyor 2b is raised, and the longitudinal guide 10 is folded in the direction of arrow C, so that the transparent surface plate 8 and the reflecting mirror 3 are formed.
The sampled optical fibers F are half-fitted into both the groove of the reflecting mirror 3 and the groove of the transparent surface plate 8 by crimping the sampled optical fibers F attached to and.

At this time, in the grooves of the reflecting mirror 3 and the transparent surface plate 8, a transparent liquid material having water repellency and slipperiness in advance,
For example, if silicone grease for optical fiber is applied, it can be fitted smoothly without damaging the surface of the sampled optical fiber F. By doing so, when the solar lighting device is used outdoors, the sampled optical fiber and the groove cannot be used for a long time. It is possible to prevent water, dust, etc. from entering the gaps.

An adhesive is applied in advance to the end portions of the reflecting mirror 3 and the transparent surface plate 8 where no groove is provided,
The two may be bonded together by pressure bonding, but if it is necessary to remove or replace the sampling optical fiber for the purpose of maintenance, inspection, etc. after installation of the solar lighting device, either the surface plate or reflecting mirror should be used. It is preferable that a hole is provided at the end of the plate and a protrusion is provided at a position opposite to the other plate, and the two plates are engaged with each other so as to be detachably fixed. The holes and the protrusions may be formed by concave grooves and convex grooves.

Further, the vertical positional relationship between the reflecting mirror 3 and the surface plate 8 at the time of fitting may be reverse to the above relationship.
The present invention also includes a large number of optical fibers F stretched over,
Since the mutual positional relationship between the reflecting mirror 3 and the surface plate 8 is designated, the target range of the present invention is valid even when the sampling optical fiber groups are vertically arranged side by side or vertically stretched.

Then, in this way, the sampling optical fiber F,
As shown in FIG. 3, the light-collecting part obtained by integrating the reflecting mirror 3 and the transparent surface plate 8 is sent out to the roller conveyor 6 as shown in FIG.
In the above, in the direction of the arrow D, the transparent surface plate 8 is placed with the sampling optical fiber group being pulled to the rear portion (the end portion on the sampling optical fiber bobbin side).
Move it to a position that is slightly longer than the vertical length (direction of the groove of the optical fiber).

After completion of the movement, the lower bar 11a provided near the sampling optical fiber bobbin 7 is pressed by the upper bar 11b to apply friction pressure to the sampling optical fiber group,
The slack of the sampling optical fiber group stretched between the sampling part and the sampling optical fiber bobbin 7 is eliminated.

In this state, at the position of the elevating roller conveyor 2b, a reflecting mirror (second reflecting mirror) 3 and a transparent surface plate (second transparent surface plate) are attached to the stretched optical fiber collection line.
8 is crimped, so that the sampled optical fiber array is connected to the reflector 3
And it fits in each groove row of the transparent surface plate 8.

After that, using the optical fiber cutter 12, the optical fiber array connected between the previously assembled and moved daylighting part component and the next assembled daylighting part component is cut and assembled first. The daylighting parts move to the next process,
In the next step, a work of coupling and adhering the light guide fibers to the ends of each of the light collecting optical fibers projecting from both ends of the light collecting part is started. It should be noted that the next assembled daylighting part component moves to the position of the previously assembled and moved daylighting part component, and the assembling work is sequentially executed by repeating the above movement.

In the above-described series of operations, as a means for moving each member at the time of fitting and adhering to the sampled optical fiber array using the reflecting mirror 3 and the transparent surface plate 8 by pressure bonding, a conventionally known means is known. Preference is given to using cylinders which are hydraulically or pneumatically operated. The reflecting mirror 3 and the transparent surface plate 8 can be set to predetermined positions and the components of the lighting unit after the assembly can be moved manually or electrically.

According to this method, for example, a sampled optical fiber having a diameter of 1 mm is provided between the reflecting mirror having a size of 1 m × 1 m or 90 cm × 180 cm and the transparent surface plate, and the core-to-core 3
Hundreds of the light-collecting parts that are set in parallel accurately at intervals of 2 mm
It takes ~ 3 people to assemble dozens of sets per day.

Further, since the total thickness after assembly is about 10 mm and it can be manufactured entirely from plastic, the total weight is 1 m even if the light guide fiber group and the cover are attached to both side surfaces of the daylighting part component. 1 for x 1m equipment
It is about 0 kg, and 1 for 90 cm x 180 cm equipment
Since it weighs only about 6 kg, it can be easily transported and installed on the roof of a general house.

The daylighting part component thus constructed is shown in FIG.
As shown in FIG. 6, the leg 18, the light guide fiber 15 and the like are attached to form a sunlight collecting device. Since the transparent surface plate 8, the optical fiber array F, the reflecting mirror 3, and the base plate 13 in this device are integrated in close contact with each other, they are installed outdoors at a high place where maintenance is difficult and exposed to wind and rain for a long period of time. Even if it is used in a state where it is repeatedly heated and cooled day and night, there is no risk of dust adhering to the surface of the sampled optical fiber, dew condensation or freezing inside the device, and rupture or deformation due to air expansion inside.

If a part of a circular inflection line which is the cross-sectional outer shape of the optical fiber F as shown in FIG. The sunlight that has a relationship orthogonal to the circumscribing line, passes through between the light-collecting optical fibers, and reaches the mirror surface, is all reflected toward the fiber-collecting optical fiber F on the mirror surface 3a, and the light-collecting efficiency can be improved. In this case, although the manufacturing cost is higher than that of the flat mirror-shaped mirror, the reflected light reaching the optical fiber F can be increased about three times.

Example 1 Ten polycarbonate sheets each having a length of 1 m and a width of 1 m and having a thickness of 2 mm and a thickness of 3 mm were prepared, and a depth of 0.5 mm (+0.1 mm, -0 mm) was provided on each side. ) Semicircular groove 29
3 pieces, core-to-core spacing in the groove is dug 3.3 mm, thickness 2 mm
The back surface of each of the plates was mirror-finished by aluminum vapor deposition. Separately from this, 10 FRP plates each having a length of 1 m x a width of 1 m and a thickness of 5 mm were prepared.
The mirror side of the 2 mm thick polycarbonate plate was bonded with an adhesive.

Silicon grease for optical fibers (SC107 manufactured by Toray Dow Corning Silicone Co., Ltd.) was thinly applied in the groove of each polycarbonate plate. Further, an adhesive was applied to the groove-free surface, that is, the end portion having no groove.

The roller conveyors 1, 2, 6 shown in FIG.
Using a fiber optic stretcher, a total of 293 photoexcitable fibers containing 5 kinds of fluorescent substances and having a diameter of 1 mm, obtained from Nippon Petrochemical Co., Ltd., with a core-core spacing of 3.3.
Stretched in mm.

Using the supply roller conveyors 1 and 2, one base plate to which the above-mentioned mirror surface plate is attached is stretched while guiding the guide optical fiber to the guides 4 and 5 with the side where the groove is dug in the mirror surface plate as the upper surface. I moved it to the bottom of the part.

Next, by using four suction cups suspended from the overhead traveling crane 9, a grooved polycarbonate plate having a thickness of 3 mm is suspended with the surface having no groove as the upper surface, and a pusher provided on the upper part of the elevating roller conveyor 2b. It was lowered along the guide 10 which also serves as a plate and placed on the stretched optical fiber array. Next, the elevating roller conveyor 2b is raised, the guide 10 is folded, and the stretched sampled optical fiber rows are half-fitted in the grooves of the transparent surface plate 8 and the grooves of the reflecting mirror 3, respectively, and the adhesive applied to the end surface of the reflecting mirror 3 The reflective mirror 3 and the transparent surface plate 8 were bonded together by.

Next, the guide 10 is opened and returned to its original position,
The sampled optical fiber tension bar 11d and the sampled optical fiber row between the lighting part parts are cut by the sampled optical fiber cutter 12 to raise the sampled optical fiber tension bar 11d.

Next, the bonded and assembled lighting component is
When it is manually sent out and moved in the direction of arrow D on the roller conveyor 6 and comes into contact with a stopper (not shown), the upper and lower friction rods 11a provided in the vicinity of the bobbin of the sampled optical fiber row by a switch attached to the stopper, By pressing 11b onto the optical fiber array, the optical fiber array was stretched, and the adhered parts of the optical part were stopped.

Next, the elevating roller conveyor 2b was lowered, the respective plates were set on the upper and lower sides of the sampled optical fiber row in the same manner as described above, and the plates were pressure bonded from the upper and lower sides to form the bonded plates as in the previous case. At this time, the sampling optical fiber row connecting the two lighting part components was cut by the sampling optical fiber cutter 12. According to this manufacturing method, it was possible for two people to assemble 10 parts of the lighting unit having a length of 1 m, a width of 1 m and a thickness of 10 cm in less than 2 hours.

Silicon grease is applied to the end faces of the optical fibers on both sides of the solar lighting device thus assembled, and as shown in FIG. 4, an acrylic resin optical fiber with a diameter of 1 mm as the light guide fiber 14 (Asahi Kasei Kogyo ( A coupling pipe row 16 connected to a multi-component glass taper 15 was fitted through Luminus D) and fixed with a hard vinyl chloride side cover 17.

As shown in FIG. 4, the legs 18 made of FRP extraction rods were attached so as to be inclined at 35 degrees, and one unit was installed on the roof of a building in Osaka city. Connect two tapers 15 to the end of the bundle of light guide fibers 14, and connect each taper 15 with a light guide with a length of 10 m that bundles 28 acrylic resin optical fibers with the same diameter as above to guide them indoors. Two light emitters were connected to each other, and illuminance of 1000 lx or more was obtained on the surface of the light emitter in fine weather almost all day. The above light emitter has a thickness of 30 mm and a light emitting portion size of 150 mm ×
The light emitting portion is made of a polycarbonate plate having a thickness of 2 mm and the other parts are made of a white hard vinyl chloride plate. We believe that this solar lighting device can withstand long-term use by being installed on the roof of a building or the roof of a general house.

Example 2 A groove having a depth of 1.0 mm (+0.1 mm, −0 mm) and a semicircular length of 1.8 m is formed on one side of a polycarbonate plate having a width of 0.9 m × a length of 1.8 m and a thickness of 3 mm. 136 pieces, core-to-core 6.5mm
Several pieces were dug at intervals (12.5 mm from both ends at both ends).

Separately from this, a polycarbonate material having a length of 1.8 m, a width of 6.5 mm, and a maximum thickness of 2.2 mm and having a sectional shape corresponding to the transparent gutter-shaped reflecting mirror of FIG. 136 pieces were created per one, and aluminum was vapor-deposited on the outer curved surface to form a mirror surface.

FRP material by press molding has a width of 0.9 m ×
A piece having a length of 1.8 m and a maximum thickness of 4.5 mm and having a sectional shape corresponding to the opaque base plate of FIG. 6 was prepared, and an adhesive was applied to the curved surface portion to bond the mirror surface portion of the mirror surface material.

Using these plate materials and 136 photo-exciting fibers containing 5 kinds of fluorescent substances and having a diameter of 2 mm, which were obtained from Nippon Petrochemical Co., Ltd., and using the same method as in Example 1, the sun having the shape shown in FIG. I assembled the light collector. As the light guide fiber bundle, two bundles of 260 multi-component glass optical fibers each having a diameter of 0.25 mm and a length of 15 m were used.

The indoor unit has a thickness of 56 mm and a light emitting portion size of 140
mm x 430 mm, 50 mm outer diameter and 450 mm length acrylic tube on the inner surface (Sumitomo 3M Limited)
(Made by SOLF), and a light emitting part in which an aluminum white plate is obliquely inserted in the axial direction in the acrylic tube, and a reflector having a parabolic cross section provided on the back side of the acrylic tube and having aluminum vapor-deposited on the back surface of the acrylic tube. Two of them were used, and an illuminance of about 3000 lx was obtained on the surface of the light emitter during fine weather almost all day.

[0043]

As described above, according to the present invention, it is possible to provide a solar lighting device which can cope with an unspecified roof shape, has a simple structure, and is maintenance-free for a long period of time.

[Brief description of drawings]

FIG. 1 is a perspective view showing a manufacturing process of a sunlight collecting device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a manufacturing process of the sunlight collecting device of the embodiment.

FIG. 3 is a perspective view showing a manufacturing process of the sunlight collecting device of the embodiment.

FIG. 4 is a perspective view showing the external appearance of the sunlight collecting device of the embodiment.

5 is a perspective view of a main part showing details of an end portion of the optical fiber sample shown in FIG. 4;

FIG. 6 is a sectional view of an assembled optical fiber in the same embodiment.

[Explanation of symbols]

 F sampling optical fiber 1 feeding roller conveyor 2 feeding roller conveyor 3 sampling optical fiber 4 guide 5 guide 6 sending roller conveyor 7 sampling optical fiber bobbin 8 transparent surface plate 10 guide

Claims (4)

[Claims] 1. A plate-shaped reflecting mirror member having a mirror surface layer,
The transparent surface plate laminated on the reflecting mirror member, and a plurality of sampling optical fibers provided between the reflecting mirror member and the transparent surface plate, the reflecting mirror member and the transparent surface plate A large number of grooves are formed in parallel on either or both of the contact surfaces, and the respective optical fibers are embedded in the grooves. 2. The solar light collecting device according to claim 1, wherein a cross section of the mirror surface layer in a direction orthogonal to the groove forms a part of a curved expansion line as an outer circumference of a cross section of the sampling optical fiber. 3. A plurality of sampling optical fibers are stretched in parallel, and a reflecting mirror having a plurality of parallel grooves is provided on one side of the sampling optical fiber row so that the grooves face the sampling optical fibers. The transparent surface plate having a large number of parallel grooves is arranged on the other side so that the grooves face each of the sampling optical fibers, and the reflecting mirror and the transparent surface plate are simultaneously covered by the sampling optical fiber. A method for manufacturing a solar light collecting device, characterized in that the sampling optical fiber is pushed into the grooves of the reflecting mirror and the transparent surface plate by press-bonding via, and the reflecting mirror and the transparent surface plate are brought into close contact with each other. . 4. After the reflecting mirror and the transparent surface plate are brought into close contact with each other, the reflecting mirror and the transparent surface plate are unwound while unwinding the optical fiber bobbin connected to the reflecting mirror and the end of the transparent surface plate. After moving, after the movement, the unwound sampling optical fiber is stretched, and the second reflecting mirror and the second transparent surface plate are pressure bonded via the stretched sampling optical fiber, and the reflecting mirror and the The manufacturing method according to claim 3, wherein the optical fiber taken between the second reflecting mirror and the second reflecting mirror is cut.