JPH04190303A - Convergence type optical transmission device of sunlight lighting system - Google Patents

Abstract

PURPOSE:To obtain an optical transmission duct of smaller diameter and reduce the cost by transmitting the reflected luminous flux of the sunlight after converged to parallel luminous flux. CONSTITUTION:The reflected luminous flux of the sunlight guided by means of a reflecting mirror 7a of a sun-tracking device 7 is converged by means of a Fresnel lens 9a of a condenser 10 of a convergence type optical transmission device 8 to obtain parallel luminous flux by mans of a collimator lens 9b, and transmitted. Thus, the diameter of a cylindrical optical transmission duct 11 which serves as the transmitting path of the luminous flux can be made smaller since the diameter of the luminous flux to be transmitted is small. Further, the transmittable quantity of light is not restricted by the diameter of the optical transmission duct 11, enabling increase of the lighting quantity while the optical transmission device 8 is kept compact in size. This constitution allows the spacial restriction within the device to be released, enabling the cost reduction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a solar lighting system, and more particularly to a concentrating optical transmission device that focuses collected sunlight and transmits it as a parallel beam of light.

[Conventional technology] In order to provide a comfortable environment for residents by guiding sunlight into spaces where sunlight cannot be directly illuminated, or to irradiate sunlight to plants grown in special environments, A solar lighting system has been developed.

Generally, such a system includes a solar tracking device that includes a microcomputer programmed with the annual solar orbit, a reflector that tracks the circling sun and reflects sunlight in a fixed direction, and a solar tracking device that tracks the sun as it orbits and reflects sunlight in a fixed direction. It consists of an optical transmission device that transmits the luminous flux to the required location. As an optical transmission device, there is a device consisting of multiple optical fibers (optical fiber single type), but in this device, the irradiated light is limited to a part of the visible range due to the transmission characteristics of the optical fiber.
Furthermore, since the transmission distance and lighting illuminance are inversely proportional, there is a problem that there is a limit to the transmission distance.

Therefore, in order to perform long-distance transmission, an optical duct type optical transmission device shown in FIG. 5 has been conventionally employed.

In the same figure, building 1 receives sunlight from building 1.
A sunlight lighting system 2 is installed to transmit and irradiate the closed space 1a. Solar lighting system 2 is
A solar tracking device 3 that moves a reflecting mirror 3a as the sun orbits and always reflects and guide sunlight in a fixed direction;
It is comprised of a light transmission device 4 that transmits reflected light flux of guided sunlight to a closed space 1a. This optical transmission device 4 is a tube that serves as an optical transmission path for the reflected light flux of sunlight guided from a reflecting mirror 3a, and is an optical transmission duct (5a, 5b) whose inner and side walls are entirely mirror-finished. , 5c are connected by flanges 5e, 5e', 5f, and 5f'.

In the conventional optical transmission device 4 having such a structure,
The reflected luminous flux of sunlight is transmitted through the entrance opening 5 of the optical transmission duct 5a.
Light guided to a', mirror-finished optical transmission duct h5a, 5
Light transmission duct 5C while being reflected by the inner side walls of b and 5c
is transmitted to the exit opening 5c' of the closed space 1a.

(Problem B to be Solved by the Invention) However, the conventional optical transmission device 4 has the following problems.

■ Since the reflected light flux of guided sunlight is transmitted without convergence, the amount of light that can be transmitted is limited by the cross-sectional area of the optical transmission duct, which is the optical transmission path. That is, in order to ensure the amount of daylight, the diameter of the optical transmission duct needs to be set large. However, since increasing the diameter of the optical transmission duct poses a problem in installing it inside the building 1, there is a limit to its diameter.

■ Optical transmission duct) The cross-sectional area of 5a, 5b, and 5c is 250c.
If the value exceeds n, the Building Standards Act requires the installation of a fire damper in the portion that penetrates the fire protection compartment, and installation of the fire damper becomes an obstacle to transmission, resulting in a reduction in transmission efficiency.

■ The reflected light flux of the guided sunlight is reflected and transmitted by the mirror-finished inner side walls of the optical transmission ducts 5a, 5b, and 5c, so a transmission loss occurs due to the diffusion, resulting in a decrease in transmission efficiency. invite

(2) Since the entire inner side walls of the optical transmission ducts 5a, 5b, and 5c are mirror-finished, the cost is extremely high, and furthermore, maintenance is extremely difficult if the surfaces become contaminated.

As a method to solve the above problems, the optical transmission duct 5a
, 5b, 5c, instead of mirror-finishing the inner side walls, a method has been devised in which a reflecting mirror is installed at each bent part, but it is not possible to reduce the diameter of the optical transmission duct, and it is difficult to realize a large-diameter reflecting mirror. In particular, when the angle of incidence is large, the aperture of the reflecting mirror becomes extremely large. Therefore, the cost is high, and furthermore, it is extremely difficult to adjust the fixed angle of the reflecting mirror, and there are many practical problems.

In view of the above-mentioned problems, an object of the present invention is to condense reflected light beams of sunlight into parallel light beams and transmit the same, and to connect light transmission ducts at right angles using connecting members of the same shape to form an optical transmission path. The object of the present invention is to provide a concentrating optical transmission device for a solar lighting system, which can reduce the diameter of the optical transmission duct and reduce the cost by ensuring the above-mentioned characteristics.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the means taken by the present invention in an optical transmission device for a solar lighting system that transmits reflected luminous flux of sunlight to a required place are as follows. The object of the present invention is to include a condenser having at least a flange lens for converging the reflected light beam and a collimator lens for converting the focused light into a parallel light beam, and a light transmission duct to serve as a transmission path for the parallel light beam.

It is desirable that the collimator lens described above is placed within the focal length of the Fresnel lens.

Further, it is preferable that the condenser has an optical axis adjustment mechanism for a collimator lens.

Furthermore, the optical transmission duct connects the cylindrical optical transmission duct and the optical transmission duct at right angles, and the optical transmission duct is connected to the optical transmission duct at a right angle. It is desirable to have a connecting member equipped with a reflecting mirror that reflects the parallel light beam at 90 degrees and reflects it to the other side.

The connecting member has 2,000 perpendicularly adjacent faces having a connection hole to communicate with the optical transmission duct, and a fixing member that protrudes outside from around the connection hole, into which the optical transmission duct is inserted and supports it. It is preferable to have a guide for use.

[Operation] The reflected light flux of sunlight guided by the reflecting mirror of the solar tracking device is focused by the Fresnel lens of the condenser of the condensing type optical transmission device, and is also converted into a parallel light flux by the collimator lens and transmitted. Ru.

Therefore, since the transmitted light beam is small, the diameter of the cylindrical optical transmission duct that is the transmission path can be reduced.

Further, since the amount of light that can be transmitted is not limited by the diameter of the optical transmission duct, it is possible to increase the amount of light while reducing the size of the optical transmission device. Therefore, spatial restrictions on installation are relaxed. Moreover, the cross-sectional area of the optical transmission duct is 25
If it is set to 0d or less, the obligation to install a fire damper can be avoided, and the transmission efficiency will not decrease due to the installation of a fire damper.

In addition, since there is no dispersion of parallel light flux within the light transmission duct, the attenuation of the reflected light flux of sunlight is only related to the transmittance of the Fresnel lens and collimator lens of the concentrator, resulting in extremely small transmission loss and a high amount of daylight. Can be secured. Furthermore, Fresnel lenses are lightweight, thin, and inexpensive.
It is easy to handle and the light collection area can be easily expanded.

Moreover, when the above-mentioned collimator lens is arranged within the focal length of the Fresnel lens, dust, dirt, etc. floating between the Fresnel lens and the collimator lens will not ignite.

Furthermore, if the above condenser has a collimator lens optical axis adjustment mechanism, the optical axis of the collimator lens can be adjusted to the optical axis of the Fresnel lens, and it also corresponds to the focal position of the Fresnel lens. Since the collimator lenses can be placed opposite each other, the reflected light beam of sunlight focused by the Fresnel lens can be reliably converted into a parallel light beam and transmitted to the light transmission duct.

The connecting member is equipped with a reflector that reflects the parallel light flux that should be incident parallel to the axis from one side of the optical transmission duct at 90 degrees and then reflects it to the other side, so that the optical transmission ducts can be connected. A transmission path for parallel light beams can be secured simply by connecting the members at right angles. As a result, optical axis adjustment after installing the condensing optical transmission device is simplified. Moreover, since the connection angle of the optical transmission duct and the fixing angle of the reflecting mirror are the same in both connection members, it is possible to perform grading, and there is no need to mirror-finish the inner side wall of the optical transmission duct. It is possible to reduce the cost of a condensing optical transmission device.

In addition, when the connecting member has two planes that are adjacent to each other at right angles and have a connecting hole, and a fixing guide that protrudes outside from around the connecting hole, the optical transmission duct can be inserted into the fixing guide. By simply fixing the light beams at right angles, all the light transmission ducts are reliably connected and communicated at right angles, so it is possible to easily and reliably secure a light transmission path for parallel light beams.

[Example] Next, the overall configuration of a concentrating optical transmission device for a solar lighting system according to an example of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 is a front view showing the installed state of the condensing optical transmission device of the embodiment, and FIG. 2 is a partially enlarged perspective view.

In these figures, in order to transmit sunlight received from the rooftop of the building 1 to the closed space 1a of the building 1 and irradiate it,
A solar lighting system 6 is installed. The sunlight daylighting system 6 has a built-in microcomputer programmed with the annual solar orbit, and includes a solar tracking device 7 that tracks the orbiting sun and moves a reflecting mirror 7a to reflect sunlight in a fixed direction. , and a condensing light transmission device 8 that transmits the reflected light flux of the guided sunlight to the closed space 1a. This condensing type optical transmission device 8 includes a Fresnel lens 9 that converges a reflected beam of sunlight guided from a reflecting mirror 7a.
a and a condenser lens 9b (collimator lens) arranged between the Fresnel lens 9a and the rear focal point and converting the reflected light beam into a parallel light beam; Optical transmission duct lla, llb,
11c and the optical transmission ducts Ila, llb, llc are connected at right angles, and the optical transmission ducts l-11a, llc are connected at right angles.
A reflecting mirror 12C that reflects the parallel light beam incident from the side b at 90 degrees and reflects it to the side of the optical transmission duct)llb, 1lcO.
', 12d' are connected in communication with the connection part lO' of the condenser 10 and the optical transmission duct hlla, and the parallel light flux converted by the condenser 10 is transferred to the optical transmission duct 11a. Two connecting members are combined at a predetermined angle in order to transmit data, and have connecting members 12a, 12b having the same shape as connecting members 12c, 12d. Here, the optical transmission ducts lla, llb, 11c and the connecting members 12c, 12d are arranged inside the exhaust duct 1b already installed in the building 1.

In addition, the condenser 10 is equipped with an optical axis adjustment mechanism 13 for the concave lens 9b shown in FIGS. 3(a) to (c), and the angle, focal length, and relative position of the optical axis can be adjusted. It has become.

FIG. 3(a) is a front sectional view thereof, FIG. 3(b) is a side view thereof, and FIG. 3(c) is an enlarged sectional view of the periphery of the concave lens 9b.

In these figures, 14c is a bouncing cover, and the optical axis adjustment mechanism 13 of the concave lens 9b is connected to the housing 1 in which the Fresnel lens 9a is attached to the opening 14a.
4, a side wall 14b having an opening 14b' formed around the optical axis 9a# of the Fresnel lens 9a and through which a lens barrel guide to be described later protrudes from the inside, a concave lens 9b, and an infrared absorption filter 90. The lens barrel I5 is fitted with the lens barrel I5, and the lens barrel 15 is inserted into the lens barrel and is slidable, and the through holes 16a and 15a'
Pol l-16b, 16 that fixes the lens barrel 15 through
lens barrel guide 17 with b' and lens barrel guide 1
7 slide part 17a and lens barrel 15 are opening part 14b
′, the side wall 14b and the coil spring 18
hole 1 of the fixing part 17b of the lens barrel guide 17
Three lens barrel guide adjustment screws 1 screwed into 7b'
9a, 19b, and 19c. Here, side wall 1
4b is pol l-14d in housing I4.

14e, 14f, 14g, and 14h, and the bolt holes in the side wall 14b are bolts 14d.

It is 2 to 3 am larger than the outer diameter of the screw shaft portions 14e, 14f, 14g, and 14h. In the optical axis adjustment mechanism 13 having such a configuration, the optical axis of the concave lens 9b is adjusted as follows. First, in adjusting the angle of the optical axis, the lens barrel guide adjustment screws 19a, 19b, 19c
By adjusting the degree of tightening of each lens barrel guide 17, the axis of the lens barrel guide 17 is displaced. As a result, the lens barrel 15
is displaced, and the optical axis of the concave lens 9b is angularly adjusted and fixed to the optical axis 9a'' of the Fresnel lens 9a.

Further, in adjusting the focal length, the lens barrel 15 is slid while being fitted into the lens barrel guide 17, and the position of the concave lens 9b relative to the Fresnel lens 9a is adjusted and fixed. Furthermore, in adjusting the relative position of the optical axis,
The side wall 14b is connected to the housing 14 by the inner diameter of the bolt hole of the side wall 14b and the bolts 14d, 14e, 14f, 14g.
, 14h can be displaced by an amount corresponding to the difference in outer diameter of the screw shaft portion, and the relative positions of the optical axes of the Fresnel lens 9a and the concave lens 9b are adjusted. As shown in FIG. 3(d), which is an enlarged front view of the periphery of the Fresnel lens 9a, the outer frame 9a' of the Fresnel lens 9a is attached to the housing 14 by a bolt 14d' through the notch 14d.
It is fixed to , and can be displaced by an amount corresponding to the notch 14d.

On the other hand, the connecting members 12a, 12b, 12c, and 12d all have the same shape, and an enlarged perspective view of the connecting members is shown in FIG. 4(a).
Shown below.

As shown in the figure, the connecting member 12 is an optical transmission duct)
11', which have connection holes 12e and 12e' that are adjacent at right angles, and the connection hole 12e.
, 12e', and into which the optical transmission ducts l-11, 21' are inserted and supported, and a reflective surface on the 2,000-plane side 12f, 12f'. Reflector 12' fixed at an angle of 45 degrees with
It has Here, the connecting member 12 and the optical transmission ducts 11 and 11' are fixed by bolts lld, lie, lid' and 11e' from the outer surface of the optical transmission ducts 11 and 11'. In addition, when the connecting members are connected to each other, as shown in FIG. 4(b), both fixing guides 12g
, connect the connecting ring 121 that spans the outer periphery of 12h to
12i' is tightened and fixed.

In the condensing optical transmission device 8 having such a configuration,
The reflected light beam of sunlight guided from the reflecting mirror 7a is focused by the Fresnel lens 9a of the condenser 10, and further converted into a parallel light beam by the concave lens 9b whose optical axis is adjusted by the optical axis adjustment mechanism 13 of the lens. be done. This parallel light beam is transmitted to the connecting member 12a, and the incident parallel light beam is reflected to the connecting member 12b by the reflecting mirror 12a'.

Further, the parallel light beam incident on the connecting member 12b is transmitted to the optical transmission duct 11a by the reflecting mirror 12b', and is transmitted inside the optical transmission ducts llb and llc while sequentially changing the optical path with the connecting members 12c and 12d. and irradiates the closed space 1a from the exit opening 11C# of the optical transmission duct)llc.

As described above, in the concentrating optical transmission device 8 according to the present embodiment, the reflected light flux of sunlight is focused into a parallel light flux and transmitted, so the transmitted light flux is small, and the optical transmission duct serving as the transmission path) Ila,llb.

11c is realized, and the reflecting mirror 12a'
, 12b', 12c', and 12d' are also reduced in diameter.

Therefore, the optical transmission ducts lla, llb.

11c can also be installed in a narrow space such as the exhaust duct 1b of the building 1. In addition, the optical transmission ducts 11a, l
Since the cross-sectional area of lb and llc is sufficient to be 250C111 or less, the obligation to install a fire damper can be avoided. Also,
The reflected light flux of sunlight does not cause transmission loss due to diffusion, and its attenuation occurs only by the transmittance of the Fresnel lens 9a and the concave lens 9b. It is also possible to increase the amount of daylight while keeping the diameter small. Furthermore, since the Fresnel lens 9a is lightweight, thin, and inexpensive, it is easy to handle and it is also possible to expand the light collection area.

Furthermore, since the condenser 10 has the lens optical axis adjustment mechanism 13, it is possible to reliably convert the reflected light beam of sunlight into a parallel light beam.

The connecting member 12 is a fixing guide 12g.

12g', the optical transmission duct 11 is connected to them.
By simply inserting and fixing the parts 11', they can be connected and communicated at right angles, and the optical transmission path of the parallel light beam is reliably secured.

Therefore, optical axis adjustment after installing the condensing optical transmission device 8 is simplified. Moreover, since all the connecting members 12 have the same shape, they can be rated, and the optical transmission duct can be
Since there is no need to perform mirror finishing on the insides of a, Ilb, and Ilc, further cost reduction can be achieved.

In the embodiment, one concave lens 9b was used as the collimator lens of the condenser 10, but it may be a convex lens, a concave lens, or a combination thereof, and the Fresnel lens may be a compound lens.

Further, the condenser 10 or the connecting member 12 may be provided with an inspection port and a fine adjustment mechanism for the reflecting mirror, and the optical transmission duct 11.
The method of fixing 11' and the connecting member 12 is not limited to bolts.

The transmitted reflected light flux of sunlight may be irradiated as it is, or may be irradiated after being diffused or converged.

[Effects of the Invention] The concentrating light transmission device for the sunlight daylighting system according to the present invention is characterized in that it includes a light concentrator including at least a Fresnel lens and a collimator lens, and a light transmission duct. Since it has the following effects.

- Since the beam is focused into a parallel beam and transmitted, the beam is small and the diameter of the optical transmission duct, which is the transmission path, can be reduced.

Therefore, the obligation to install fire dampers can be avoided, and
Spatial restrictions on installation are relaxed.

■ The amount of daylight is not limited by the cross-sectional area of the optical transmission duct.

Moreover, since the transmission loss within the optical transmission duct is extremely small, the amount of daylight can be increased while keeping the diameter of the optical transmission duct small.

■ Fresnel lenses are lightweight, thin, and inexpensive, making them easy to handle and expanding the light-converging area.

■ If there is no focal point of the Fresnel lens between the Fresnel lens and the collimator lens, the dust, dust, etc. floating between them will not ignite.

(2) If the condenser has a lens optical axis adjustment mechanism, the optical axis can be adjusted reliably.

■ If the optical transmission ducts are connected at right angles and have a connecting member equipped with a reflecting mirror that reflects the incident parallel light flux at 90 degrees, the fixed angle of the reflecting mirror is the same as that of the optical transmission duct. Since the connection angle matches the connection angle of , the optical axis adjustment after installing the optical transmission duct is simplified.

(2) Since all connecting members have the same shape, they can be rated and the cost of the condensing optical transmission device can be reduced.

■ If the connecting member has a fixing guide that protrudes from around the connection hole, the optical transmission duct can be connected at right angles by simply inserting and fixing the optical transmission duct into the fixing guide. Concatenated. Therefore, an optical transmission path can be reliably formed.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an installed state of a solar light concentrating and transmitting device according to an embodiment of the present invention. FIG. 2 is a partially enlarged perspective view of the solar light concentrating and transmitting device according to the embodiment of the present invention. FIG. 3(a) is a front sectional view of a concentrator of a solar light concentrating and transmitting device according to an embodiment of the present invention, FIG. 3(b) is a side view thereof, and FIG. 3(c) is an enlarged sectional view of the periphery of the lens barrel, and FIG. 3(d) is a front view showing the fixing structure of the Fresnel lens. FIG. 4(a) is a perspective view showing the structure of the connecting member used in the solar light concentrating and transmitting device according to the embodiment of the present invention, and FIG. 4(b) is a perspective view showing the structure of the connecting member used for connecting the connecting members. FIG. FIG. 5 is a front view showing the installation state of a conventional solar power transmission device. [Explanation of symbols] 6...Solar lighting system 7...Solar light tracking device 7a...Reflector 8 of the sunlight tracking device...Concentrating light transmission device 9a...Fresnel lens 9b. ...Concave lens (collimator lens) 10...Concentrator 11.11', lla, Ilb, 1lc...Light transmission duct 12.12a, 12b, 12c, 12d...Connecting member 12', 12a', 12b', 12c', 12
d'...Reflector 13...Optical axis adjustment mechanism of concave lens. Figure 3 (d) 9o Fresnel lens

Claims (5)

[Claims] (1) A light transmission device for a sunlight daylighting system that transmits reflected light beams of sunlight guided by a reflector of a solar tracking device to a desired location, including a Fresnel lens that focuses the reflected light beams and the focused light. 1. A concentrating light transmission device for a solar lighting system, comprising: a concentrator including at least a collimator lens that converts a collimated light beam into a parallel light beam; and a light transmission duct that serves as a transmission path for the parallel light beam. (2) In claim 1, the collimator lens:
1. A concentrating light transmission device for a solar lighting system, characterized in that the device is disposed within a focal length of the Fresnel lens. (3) A concentrating optical transmission device for a solar lighting system according to claim 1 or 2, wherein the condenser has an optical axis adjustment mechanism for the collimator lens. (4) In any one of claims 1 to 3, the optical transmission duct is connected to a cylindrical optical transmission duct in communication with the optical transmission duct at right angles, and the optical transmission duct is connected at right angles to each other. and a connecting member equipped with a reflecting mirror that reflects the parallel light flux that should be incident from one side of the light transmission duct substantially parallel to its axis at 90 degrees and reflects it to the other side. Concentrating optical transmission equipment for daylighting systems. (5) In any one of claims 1 to 4, the connecting member includes two orthogonally adjacent planes having a connecting hole to communicate with the optical transmission duct, and a connecting member extending from the periphery of the connecting hole. 1. A concentrating light transmission device for a solar lighting system, comprising a fixing guide that protrudes to the outside and into which the light transmission duct is inserted and supports it.