Light radiator
BACKGROUND OF THE INVENTION 
     The present invention relates to a light radiator for effectively diffusing and radiating light rays which have been transmitted through an optical cable or the like outside of the optical conductor cable. 
     The present application has previously proposed various ways to focus solar rays or artificial light rays by use of lenses or the like and to guide them into an optical conductor cable, and thereby to transmit them onto an optional desired place. The solar rays or artificial light rays transmitted and emitted in such a way are employed for the photo-synthesis process to promote the cultivation of plants and for use in illumination. 
     However, in the case of utilizing 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 threfrom, 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 light energy as described above, it is impossible to obtain 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 light radiators capable of effectively diffusing the light rays which have been transmitted through them and for radiating the same rays for 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 including at least two cylinders arranged in parallel and an optical means accommodated in each cylinder to move opposite direction. 
     According to the present invention, since the respective movement of two optical means are opposite, it is possible to provide a light radiator capable of much more effectively diffusing and radiating light rays. 
     It is another object of the present invention to provide a light radiator capable of adjusting the movement stroke of the optical means in each cylinder, the light rays can be effectively radiated and supplied to an optional desired position by limiting them to a desired area. 
    
    
     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 the present invention; 
     FIG. 2 is a perspective view for explaining an embodiment of the liquid pump 40 shown in FIG. 1; 
     FIG. 3 is a front view of the liquid pump 40; 
     FIG. 4 is a cross-sectional view taken along the section line IV--IV of FIG. 3; 
     FIG. 5 is a cross-sectional view of the liquid pump portion and the supporting pillar portion; 
     FIG. 6 is a front view of the supporting pillar; and 
     FIG. 7 is a back view of the supporting pillar. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     FIG. 1 is a cross-sectional view for explaining an embodiment of a light radiator according to the present invention. In FIG. 1, 10 1  through 10 4  are transparent cylinders, 20 1  through 20 4  are optical conductors 30 1  through 30 4  are optical means (light source means) which are movably installed in the respective cylinders, 40 a liquid pump, and 50 a foundation for carrying the liquid pump 40 thereon. Each of the cylinders is filled with optical oil. 
     The light rays transmitted through the conductors 20 1  through 20 4  are radiated into the repective cylinders 10 1   through 10 4  and propagate in a direction shown by an arrow A inside of the respective cylinders. In such a manner, the light rays radiated into the respective cylinders 10 1  through 10 4  impinge on the optical means 30 1  through 30 4  and are reflected by the same. Furthermore, the light rays are radiated in a direction shown by an arrow B from the respective cylinder and supply light (energy) to the neighboring plants. In addition, the afore-mentioned optical means are explained in detail in the Japanese patent application No. 117241/1984 and others previously proposed by the present applicant (inventor). Therefore any detailed explanation of the optical means is omitted here. 
     In the respective cylinders 10 1  through 10 4 , the transmission of light rays is performed effectively. The cylinders are filled with optical oil in order to move the optical means therein. A differential pressure is applied between the front and rear portions of the respective optical means through the optical oil. The respective optical means 30 1  through 30 4 , are moved by the action of the differential pressure. 
     FIG. 2 is a perspective view showing an embodiment of the liquid pump. FIG. 3 is a front view. FIG. 4 is a cross-sectional view taken along the section line IV--IV of FIG. 3. In FIGS. 2 through 4, 41 is a large diametered cylinder having a considerably larger diameter than that of the cylinders 10 1  through 10 4 , and 42 is a piston plate which partitions the internal space of the cylinder 41 and moves in a direction shown by an arrow C or D. When the piston plate 42 moves in the direction of C, the pressure in the chamber 41a rises and that in the chamber 41b gets lower. Thereby the optical oil flows out from the chamber 41a through a pipe 60 and the same flows in through a pipe 63 into the chamber 41b. As a result, the optical means 30 1  and 30 2  move in a direction shown by an arrow E and the other optical means 30 3  and 30 4  move in a direction shown by an arrow F. Namely, the optical means 30 1  and 30 2  and the other optical means 30 3  and 30 4  move in opposite direction to each other. 
     In such a manner, the optical means 30 1  through 30 4  move inside of the respective cylinders 10 1  through 10 4 . However, in practice, the diameter of the cylinders 10 1  through 10 4  is not large and there is much resistance to the flow. If a large differential pressure is not applied to the respective optical means, those optical means cannot be moved smoothly. 
     For this reason, in the embodiment of the present invention, a piston cylinder type pump as shown in FIGS. 2 through 4 is utilized as a liquid pump 40. The inner diameter of the cylinder 41 or the diameter of the piston 42 are made considerably larger than the diameter of the cylinders 10 1  through 10 4 , and the cross-sectional dimension of the piston 42 in the radial direction thereof is made larger than the total of the cross-sectional dimension of the cylinders 10 1  through 10 4 . For this reason, according to the present invention, much pressure can be applied to the respective cylinders with little movement of the piston 42 and the optical means 30 1  through 30 4  can be moved smoothly inside of the respective cylinders 10 1  through 10 4 . 
     A permanent magnet 43 is unitarily mounted on the piston 42. Another permanent magnet 44 is installed on the external side of the cylinder 41 opposite to the permanent magnet 43 so as to move in the directions shown by the arrows C and D. The cylinder 41 is kept liquid-proof thereby, and then movement of the piston 42 inside the cylinder 41 is made possible. 
     In the same figures, 45 is a rod screw, 46 is a motor for rotating the rod screw 45, 47 is a support arm for unitarily supporting the permanent magnet 43, 48 is a guiding rod for stopping the rotational movement of the support arm 47 and for guiding the support arm 47 so as to move it in directions C and D, and 51 is a pump supporting pillar set up on the foundation 50. When the motor 46 is driven, the rod screw 45 rotates and the permanent magnet 44 moves in the direction of C or D following the movement of the support arm 47. Consequently, the permanent magnet 43 moves, following the permanent magnet 44. In other words, the piston 42 moves following the same. When the piston 42 moves in direction C, as mentioned before, the optical oil contained in the cylinder 41 flows out through the pipe 60. As a result, the optical means 30 1  and 30 2  move in direction E and the other optical means 30 3  and 30 4  move in direction F. The respective optical means 30 1  through 30 4  radiate the light rays in direction B when they move. 
     On the contrary, when the revolution of the motor 46 is reversed, the piston 42 moves in the direction of D. At this time, the optical oil inside the cylinder 41 flows out through the pipe 63. Therefore, the optical means 30 1  through 30 4  move in a direction opposite to that mentioned above. The light rays are emitted at this time in the direction of B from the respective optical means 30 1  through 30 4 . 
     The numerals 48a and 48b represent sensors regulating the movement stroke of the above-mentioned permanent magnet 44. When the permanent magnet 44 moves in the direction of C and arrives at the sensor 48a, the position of the permanent magnet 44 is detected and the revolutions of the motor 46 are reversed. At this time, the permanent magnet 44 moves in direction D. When the permanent magnet arrives at the sensor 48b, the position of the permanent magnet 44 is detected thereby and the revolutions of the motor 40 are reversed again and the permanent magnet 44 moves in direction C. 
     In such a manner, the movement of the permanent magnet 44 is reversed by the sensors 48a and 48b. The position of those sensors 48a and 48b can be adjusted to the movement of the permanent magnet 44. If the distance between those sensors 48a and 48b is narrowed, the movement area of the permanent magnet 44, that is, the piston 42 becomes narrow. Therefore, the movement area of the optical means 30 1  through 30 4  also becomes narrow. On the contrary, if the distance between the sensors 48a and 48b is enlarged, the movement area of the optical means 30 1  through 30 4  becomes wider. In such a manner, the movement area of the optical means 30 1  through 30 4  can be adjusted to create optimum use of the light radiator. 
     As described above, the optical oil flowing out from the pipe 60 enters the cylinders 10 1  and 10 2 , and it flows out from those cylinders 10 1  and 10 2  while pushing the optical means 30 1  and 30 2  in those cylinders 10 1  and 10 2  in the direction of E. The optical oil flowing out from the cylinder 10 1  enters the cylinder 10 3  through the pipe 61, while the optical oil flowing out from the cylinder 10 2  enters the cylinder 10 4  through the pipe 62. As a result, the optical means 30 3  and 30 4  installed in those cylinders moves in direction F, and the optical oil circularly flows into the liquid pump 40 through the pipe. 
     Afterward, when the revolutions of the motor 46 are reversed, the circular-flow direction of the optical oil is also reversed and the optical means 30 1 , 30 2  and the other optical means 30 3 , 30 4  move in a direction opposite to that mentioned above. 
     As is apparent from the foregoing description, in the present invention, the cylinders 30 1  and 30 2  and the other cylinders 30 3  and 30 4  are arranged parallel to each other physically. Furthermore, those pairs of cylinders, connected in series, flow dynamically. The movement of the optical means 30 1  (or 30 2 ) in the cylinder 10 1  (or 10 2 ) and that of the optical means 30 3  (or 30 4 ) in the cylinder 10 3  (or 10 4 ) are always opposite to each other. Consequently the light sources can be effectively arranged in the case of needing a large number of movable light sources, etc. Since the movement direction of the light sources is different, the light rays can be diffused more effectively. 
     An example in which the cylinders 10 1  and 10 2  are provided for optical means 30 1  and 30 2  which are moving in direction E and the cylinders 10 3  and 10 4  are provided for optical means 30 3  and 30 4  moving in direction F, namely, two cylinders are provided for each one of the directions shown in FIG. 1. However, one or optionally plural cylinders can be provided for each direction. In the case of employing plural cylinders, the outflow ends and the inflow ends of the cylinders of the optical means moving in the same direction are commonly connected with each other. As shown in FIG. 1, the outflow ends of cylinders 10 1  and 10 2  are commonly connected and the inflow ends of the cylinders 10 3  and 10 4  are also commonly connected. Furthermore, the connection between the commonly connected portions can be done by use of a single pipe. 
     And further, in FIG. 1, 70 is a throttle valve installed at the inlet side (or the outlet side) of the cylinder 10 1 . If the flowdynamic resistance for the cylinder 10 1  is changed by use of the throttle valve 70, the amount of the optical oil flowing into the cylinder 10 1  is also changed so that the movement area of the optical means 30 1  in the cylinder 10 1  can be changed. For instance, supposing that the throttle valve 70 regulates the flowdynamic resistance of cylinder 10 1  so as to set it to the valve twice as much as for cylinder 10 2 , the optical oil to be supplied to the cylinders 10 1  and 10 2  through the pipe 60 or 63 is distributed proportionally to those cylinders. On that occasion, the optical oil of half the amount of the cylinder 10 2  is supplied to the cylinder 10 1 . As a result, the optical means 30 1  in the cylinder 10 1  moves in a range of half the distance compared with the optical means 30 2  in the cylinder 10 2 . 
     As is the case shown in FIG. 1, the movement area of the optical means 30 3  in the cylinder 10 3  turns out to be narrow as a matter of course. However, the present invention is not limited to the embodiment shown in FIG. 1. On that occasion, only the cylinders 10 1  and 10 2  may be employed for constructing the flowing route by omitting cylinders 10 3  and 10 4 . Furthermore, it may be possible to connect a desired number of cylinders in parallel with the cylinders 10 1  and 10 2 , to add the throttle valve as mentioned before for each cylinder, and to regulate the movement area of the optical means per each cylinder. Furthermore, it may be possible to adjust the throttling degree of the throttle valve 70 by remote control as well as the distance between the sensors 48a and 48b, and so on. In such a manner, the remote controlled operation can be performed for all elements. 
     FIG. 5 is a cross-sectional view of the liquid pump portion and its supporting pillar portion. FIG. 6 is a front view of the supporting pillar. FIG. 7 is a back view thereof. As shown in FIGS. 5 through 7, the supporting pillar 51 is comprised of an arched surface portion 52 for carrying the liquid pump 40, a side plate portion 53 for preventing the liquid pump 40 from moving in the direction of its axis, and a slit 54 for putting the pipes 60 and 63 therein at the time of carrying the liquid pump 40 on the arched surface 52 of the supporting pillar 51. Such a construction enables it to easily carry the liquid pump 40 on the supporting pillar 51 and to prevent the liquid pump 40 from moving in the directions C or D. 
     Namely, in the present invention, the optical oil in the cylinder 41 flows out or flows in when the piston 42 moves in the direction C or D. At that time, if the cylinder 41 is prevented from moving along the axis thereof, the cylinder 41 moves so that the optical oil cannot effectively flow out from the liquid pump. However, the construction of the supporting pillar 51 as shown in FIGS. 5 through 7 enables it to prevent the cylinder 41 from moving by use of a side plate portion 53. Then, since the side plate 53 has a slit 54 allowing the pipe 60 or 63 to pass therethrough, the cylinder 41 can be simply installed only by putting it on the supporting pillar 51 from an upper position. 
     The embodiment for employing a guiding rod 48 for preventing the permanent magnet 44 from moving has been described heretofore. However, as shown by the dot-and-dash line in FIGS. 3 and 4, a groove 55 is formed on the foundation 50 along the movement direction of the permanent magnet 44 and the lower end 47&#39; of a supporting arm 47 for supporting the permanent magnet 44 can be allowed to be put on the groove 55 so that the lower end 47&#39; thereof can move inside the groove. 
     As is apparent from the foregoing description, according to the present invention, it is possible to provide a light radiator capable of effectively moving the optical means installed in the transparent cylinder. And further, according to the present invention, since the respective movement of two optical means are opposite each other, it may be possible to provide a light radiator capable of much more effectively diffusing and radiating light rays. Furthermore, since the movement area of the optical means in each cylinder can be optionally adjusted, the light rays can be effectively radiated and supplied to an optional desired position by limiting them to a desired area. These are the merits of the present invention.