Abstract:
A light source device for effectively diffusing and radiating light rays which have been transmitted through an optical conductor cable or the like, to the outside of the optical conductor cable. The light source device contains a light radiator comprising a transparent cylinder, an optical conductor for guiding light rays into the cylinder through one end of it, optical means movably accommodated in the cylinder for reflecting the light rays guided into the cylinder from the optical conductor and radiating the light rays outside of the cylinder, and driving means for moving the optical means along an axis direction of the cylinder, a large number of the cylinders being arranged crosswise in a state of grille.

Description:
BACKGROUND OF THE INVENTION 
     The present applicant has previously proposed various ways to focus solar rays or artificial light rays by the use of lenses or the like and to guide the same into an optical conductor cable, and thereby to transmit them onto an optional desired place. The solar rays or the artificial light rays transmitted and emitted in such a way are employed for photo-synthesis and for use in illumination or for other like purposes, as for example, to promote the cultivation of plants. 
     However, in the case of utilizng the light energy for cultivating plants as mentioned above, the light rays transmitted through the optical conductor cable have directional characteristics. Supposing that the end portion of the optical conductor cable is cut off and the light rays are emitted therefrom, the radiation angle for the focused light rays is, in general, equal to approximately 46°. That is quite a narrow field. In the case of utilizing the light energy as described above, it is impossible to perform a desirable amount of illumination by simply cutting off the end portion of the optical conductor cable and by letting the light rays emit therefrom. 
     Therefore, the present applicant has already proposed various kinds of radiators capable of effectively diffusing the light rays which have been transmitted through an optical conductor cable and for radiating the same for the purpose of illuminating a desired area. The present invention extends the idea and, in particular aims at applying intensified light rays to a desired place and to keep the light source at a distance to plants and to move the light source back and forth in order to supply light rays over a wider area. 
     SUMMARY OF THE INVENTION 
     It is an object of the present invention to provide a light radiator capable of effectively emitting solar rays or artificial light rays which were transmitted through an optical conductor cable outside the same for nurturing plants. 
     It is another object of the present invention to provide a light radiator capable of effectively moving the optical means installed in a transparent cylinder. 
     It is another object of the present invention to provide a light radiator of which the light energy of good quality and suitable for nurturing the plants can be effectively supplied to the plants. 
     The above-mentioned features and other advantages of the present invention will be apparent from the following detailed description which goes with the accompanying drawings. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a construction view for explaining an embodiment of a light radiator proposed in another way by the present applicant; 
     FIG. 2 is a construction view showing an embodiment of the optical means; 
     FIG. 3 is a construction view for explaining an embodiment of a light source device according to the present invention; 
     FIG. 4 is a construction view for explaining another embodiment of the present invention; 
     FIG. 5 is a view showing an embodiment of the optical, oil-supplying method for arranging a large number of cylinders parallel to each other; and 
     FIG. 6 is a construction view for explaining another embodiment of a light filter; 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     FIG. 1 is a perspective construction view for explaining an embodiment of a light radiator proposed in another way by the present applicant. In FIG. 1, 10 1  and 10 2  are transparent cylinders, 20 1  and 20 2  optical conductors, 30 1  and 30 2  optical means, and 40 1  and 40 2  liquid pumps. The cylinders 10 1  and 10 2  are filled with optical oil. The liquid pumps 40 1  and 40 2  consist of, respectively, cylinders 40a 1 , 40a 2  and pistons 40b 1 , 40b 2 . The pistons 40b 1 , 40b 2  are connected with each other through a connecting member 50 which can be reciprocally moved in the direction of A and the direction of B by means of a driving means which acts like a motor. 
     Consequently, when the connecting member 50 is moved in the direction shown by arrow A, optical oil in the liquid pump 40 1  is pushed out in the direction of A by the piston 40b 1  and thereby supplied to the cylinder 10 1 . As a result, the optical means 30 1  in the cylinder 10 1  moves in the direction of A and, at the same time, the piston 40b 2  in the liquid pump 40 2  moves also in the direction of A. In such a manner, the optical oil in the cylinder 10 2  is sucked up by the liquid pump 40 2  so that the optical means 30 2  in the cylinder 10 2  moves in the direction of A. When the connecting member 50 is moved in a direction shown by arrow B, the liquid pumps 40 1  and 40 2  operate in a way that is completely opposite to that mentioned above so that the optical means 30 1  and 30 2  move in the direction of B. 
     Moreover, 70 1  and 70 2  are transparent pipes for protecting, respectively, cylinders 10 1  and 10 2 . Actually, the cylinders 10 1  and 10 2  are fine and made of a hard and fragile substance like quartz or the like, while the protective pipes 70 1  and 70 2 , etc. are constructed of a comparatively strong substance like acrylic, etc. In such a construction, it may be possible to prevent the cylinder 10 1  or 10 2  from being injured or destroyed when an object directly hits the cylinder 10 1  or 10 2 . 
     FIG. 2 is a cross-sectional view showing an embodiment of the optical means preferably employed in the light radiator as mentioned above. In FIG. 2, 30 is an optical means consisting of a cylindrical optical conductor 31 having one end surface 31a formed on a plane surface and another end surface 31b formed on an inclined plane surface and a cover member 32 for forming an air chamber at the side of the inclined plane surface 31b by closing the side thereof. In relation to the optical means 30, the longer side 31c of the cylinder 31 is always lowered by the action of gravity in the case of employing the cylinders 10 1  and 10 2  both of which are set horizontally. 
     The present invention intend to provide a light source device capable of effectively supplying light rays to plants etc. by utilizing the light radiator as mentioned above. However, the present invention is not limited to the afore-mentioned light radiator. Other various kinds of light radiators, which have been previously proposed by the present applicant, can also be employed according to the present invention. 
     FIG. 3 is a perspective construction view for explaining an embodiment of a light source device according to the present invention. In FIG. 3, 10x 1 , 10x 2 , . . . , 10xn are cylinders arranged in a lateral direction and parallel to each other, 10y 1 , 10y 2 , . . . , 10ym cylinders are arranged in a longitudinal direction perpendicular thereto and parallel to each other, 20x 1 , 20x 2 , . . . , 20xn, 20y 1 , 20y 2 , . . . , 20ym optical conductors for supplying the light rays into those optical conductors (cylinders), add 30x 1 , 30x 2 , . . . , 30xn, 30y 1 , 30y 2 , . . . , 30ym optical means which are movably arranged inside the respective cylinders. 
     Those optical means are moved inside the cylinders in such a manner as mentioned before and discharge the light rays downward which have been guided from the optical conductor into the cylinder. The plants to be cultivated are planted under the light radiator and arranged crosswise in parallel fashion as mentioned above. When the plants are small, the light radiator is lowered so as to set the light source near the plants. In such a manner, the plants can be nurtured much more effectively. 
     In FIG. 3, 80 is a cable for hanging down the aforementioned light radiator. The cable 80 is moved up and down by winding the same forward and backward by use of a drum (not shown in FIG. 3). When the plants are small the light radiator is lowered so as to put the light source at a position near the plants. When the plants grow up the light radiator is wound up for controlling the position of the light source in order to always supply light rays to the plants at a position near them. 
     Furthermore, the movement area of the optical means can be regulated by controlling the movement area of the movement member 50 shown in FIG. 1. When the plants are small, in other words, the square measure occupied by the plants is small, the movement area of the optical means is decreased. On the contrary, when the plants grow up the movement area thereof is increased. In such a manner, the light energy can be more and more effectively supplied to the plants. Also, the ultraviolet rays, the infrared rays or the like tend to disturb the development of plants. Those ultraviolet rays and infrared rays are not contained in the light rays transmitted through the optical conductor. However, in the case of cultivating the plants indoors by use of the light radiator as mentioned above, it follows that the ultraviolet rays or the infrared rays are supplied to the plants from a light source such as a fluorescent lamp for illuminating the inside of a room or otherwise through a light-receiving window. For this reason, it is necessary to cut out ultraviolet rays and infrared rays. 
     FIG. 4 is a cross-sectional side view showing an embodiment for cutting out the afore-mentioned harmful ultraviolet and infrared rays. In FIG. 4, 90 is a filter for cutting out ultraviolet and infrared rays. If such a filter 90 is put above the light radiator, as mentioned above, the ultraviolet or infrared rays supplied by means of a fluorescent lamp and a light receiving window are cut off by the filter 90 so that the plants can be more effectively nurtured. 
     FIG. 5 is a view showing an embodiment for arranging a large number of cylinders as mentioned above in parallel with each other. In the embodiment shown in FIG. 5, one end portion of the cylinders; 10 1 , 10 3 , . . . , 10n 1  is connected with a common optical, oil-supplying pipe 100, while the other end portion of the cylinders; 10 2 , 10 4 , . . . , 10n is connected with another common optical, oil-supplying pipe 110. The optical means 30 1  through 30n in all of those cylinders 10 1  through 10n are moved at the same time through the common optical oil supplying pipes 100 and 110. 
     On that occasion, the amount of optical oil flowing through the optical, oil-supplying pipes 100 and 110, is equal to that of the optical oil flowing through the cylinders 10 1  ˜10n. For this reason, when the number of cylinders 10 1  ˜10n becomes large, the amount of optical oil flowing through the optical, oil-supplying pipes 100 and 110 has to be increased. 
     In FIG. 5, pumps P 1  ˜P 4  are provided in order to satisfy the requirements as mentioned above. When the optical oil needs to be moved in a direction shown by the arrows, the pumps P 1  and P 3  are driven in an operative state while the other pumps P 2  and P 4  stop the operation thereof. On the contrary, when the optical oil needs to be moved in another direction i.e. opposite to that shown by the arrows, the pumps P 2  and P 4  are operatinonal while the other pumps P 1  and P 3  stop working. In such a manner, since each pump is allowed to move in only one direction, it becomes easy to control those pumps so that optical oil can be effectively supplied. 
     Furthermore, in the case of supplying the optical oil to a large number of cylinders through the common optical, oil-supplying pipes, as mentioned above, the optical oil is not always uniformly supplied to the respective cylinders. Consequently, if the fluid-resisting, value adjusting devices 11 1  ˜11n are installed at the end portions of the respective cylinders 10 1  ˜10n, the optical oil can be uniformly supplied to the cylinders 10 1  ˜10n by adjusting the fluid-resistance, value-adjusting devices 11 1  ˜11n. Otherwise, the movement area of the respective optical means 30 1  ˜30n can be optionally adjusted by adjusting the amount of optical oil to be supplied to the respective cylinders to a desired value. 
     FIG. 6 is a side view showing another embodiment of the light filter. In FIG. 6, a plurality of light filters 90 1  ˜90n are arranged, for instance, in zigzag fashion for the purpose of providing air passages. By the use of such a construction, the plants under the light radiator can be easily supplied with air. Furthermore such air passages as shown in FIG. 6 represent only one example. It can be easily understood that other various air passages are possible for the purpose. 
     As is apparent from the foregoing description, according to the present invention, it is possible to provide a light source device in which light energy of good quality which is suitable for nurturing plants can be effectively supplied to plants.