Abstract: A solar ray collecting device for use in space includes a heat-conductive supporting base plate provided with a large number of adjacent hexagonal recess portions, a large number of optical systems installed on each of the recess portions, a large number of heat-conductive protective bars set up on an upper vertex of a side wall forming the recess portion, and a protective cover for covering a light-receiving surface side of the supporting base plate and having the function of a filter capable of letting visible rays pass through. A pointed end portion of the protective bar is brought into heat-conductive contact with the protective cover.

Abstract: A photoradiator includes a notch at an axial end or in the periphery thereof in order to radiate light which propagates therethrough. Light is radiated in a desired direction and in a desired quantity at the notch. Even the optical property of the light radiated from the photoradiator may be varied for a desired application.

Abstract: A light radiator for effectively diffusing and radiating light rays outside of the optical conductor cable through which they were transmitted. The light radiator comprises a transparent cylinder, an optical conductor for guiding light rays into the cylinder, an optical means movably accommodated inside of the cylinder for reflecting the light rays guided into the cylinder and radiating outside of the cylinder, and a driving means for moving the optical means along the axis of the cylinder. The optical means is constructed with a cylindrical transparent member, a surface of one side on which the light rays impinge being formed on a plane and another surface of the other side being formed in a V-shaped concave surface.

Abstract: A connecting structure for connecting optical conductors through which light energy is transmitted. The connecting structure comprises a coupling ring of an inner diameter approximately equal to the outer diameter of the optical conductor rod, an edge surface of the optical conductor rod and that of another optical conductor rod to be connected with it in the coupling ring and being arranged so as to be opposed to each other or an edge surface of the optical conductor rod and that of a large number of the optical fibers being arranged so as to be opposed to each other, the edge surfaces being connected through the use of matching oil or optical paste.

Abstract: A light radiator for effectively diffusing and radiating light rays which have been transmitted through an optical cable or the like outside of said optical conductor cable. The light radiator is comprised of a transparent cylinder; an optical conductor for guiding light rays into the cylinder through one end of it; an optical means that is movably accommodated in the cylinder for reflecting the light rays guided into it from the optical conductor and for radiating them outside of the cylinder; and a driving means for moving the optical means along the axis of the cylinder.

Abstract: In an optical communication system, transmitter/receivers located remote from each other have an identical construction and are accurately positioned relative to each other by means of photodetectors. Each apparatus includes a transmitter section and a receiver section which are disposed in a common transparent housing. Such a construction is applicable even to a repeater between the remote apparatuses by building another set of transmitter and receiver sections in the apparatus.

Abstract: A light radiator for diffusing and radiating light rays, transmitted through an optical cable or the like, outside of the optical conductor cable, includes a transparent cylinder, an optical conductor for guiding light rays into the cylinder, an optical means movably accommodated in the cylinder for reflecting and radiating the light rays, and a driving device for moving the optical means along the axial direction of the cylinder.

Abstract: A fish feeding device utilizing a solar ray collecting device and a algae cultivating device. The fish feeding device comprises cylinders vertically installed in water so as to waft or float therein, solar ray collecting devices and/or artificial light sources equipped on the cylinders, cultivation devices suspended from the cylinders for cultivating algae or the like, and optical conductors for supplying solar rays and/or artificial light rays to the cultivation devices.

Abstract: The light radiator is comprised of a transparent cylinder, an optical conductor for guiding light rays into the cylinder through one end of the cylinder, an optical means movably accommodated inside of the cylinder for reflecting the light rays guided into the cylinder, and a driving means for moving the optical means along the axis of the cylinder, the driving means being comprised of transparent water placed in the cylinder and a liquid pump having one end connected with one end of the cylinder and the other end connected with the other end of the cylinder, and the water being moved inside of the cylinder by the use of the liquid pump.

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.

Abstract: A light radiator for effectively diffusing radiating light rays, transmitted through an optical conductor cable or the like, out of the optical conductor cable. The light radiator includes a transparent cylinder positioned almost horizontally, an optical conductor for guiding light rays into the cylinder, an optical means movably installed in the cylinder for reflecting the light rays guided into the cylinder and for radiating the reflected light rays out of the cylinder and driving means for moving the optical means along an axis of the cylinder. The optical means includes a cylindrical member having an outer diameter approximately equal to an inner diameter of the cylinder. One end surface of the cylindrical member is inclined in relation to an axis line of the cylindrical member and is formed as a reflection surface. A cavity is provided at a longer-axis side of the cylindrical member to eliminate the need for complex regulation means to regulate the direction of reflection of the light rays.

Abstract: A light diverting device for diverting a part of the light energy transmitted through an optical conductor rod and for taking it out comprises a first optical conductor rod having a through-hole in a radial direction; second and third optical conductor rods tightly inserted into the through-hole, the second and third optical conductor rods having inclined edge surfaces which engage each other in the through-hole to form a space therebetween; and a fourth optical conductor rod mounted on an outer circumferential surface of the first optical conductor rod for covering an exposed end of the second optical conductor rod in the throughhole. Optical oil is enclosed in the space between the inclined edge surfaces of the second optical conductor rod and the third optical conductor rod. A cover member mounted on the outer circumference of the first optical conductor rod covers an exposed end of the third optical conductor rod in the through-hole.

Abstract: A concentrated fish feeding device utilizing a solar ray collecting device and a algae cultivating device installed in the sea, lakes, or ponds, etc. The device comprises a culture device for cultivating algae or the like installed in water, a photo-synthesis light source for supplying light rays to the algae culture device, and an illumination light source for entirely illuminating the algae culture device.

Abstract: A fish feeding plant utilizing a solar ray collecting device and a algae cultivating device installed in the sea, the lake, or the pond, etc. The plant comprises a structure made of cylinders and constructed by vertically setting up cylinders in water and connecting the respective cylinders with each other by use of horizontal cylinders, a solar ray collecting device installed on the water surface above the structure, and a culture device for cultivating algae or the like installed in water. Solar rays collected by the solar ray collecting device being transmitted to the culture device for cultivating the algae or the like through an optical conductor cable and employed as a photo-synthesis light source for the algae or the like. The culture device cultivating the algae or the like by utilizing carbon dioxide CO.sub.2, phosphorus, nitrogen, nutritious salt, etc. contained in water, and algae or the like created by cultivation and carbon dioxide CO.sub.2 being discharged into water.

Abstract: A light diverting device for diverting a part of the light energy transmitted through an optical conductor and for taking it out of the optical conductor. The device is comprised of a first cylindrical optical conductor provided with a light emission edge surface formed on an inclined plane, a second optical conductor provided with a light-receiving edge surface having an inclined surface engaged with the inclined surface of the first one with a circular hole formed on a portion thereof and a third optical conductor having a light-receiving edge formed on the outer circumferential surface of the first optical conductor at a position opposed to said hole.

Abstract: A connecting structure for an optical conductor tube having an optical conductor rod inserted in a pipe to connect it vertically and in cascade fashion with another optical conductor tube and also having an inserted optical conductor rod. A transparent spacer of a diameter approximately equal to that of the optical conductor rods is interposed between them and the circumferential portion of the spacer has arc-shaped notches at a plurality of locations thereon. The notches have a transparent support arm engaged therewith and are elongated toward the pipe. The support arm is fixed clippingly by the flange.

Abstract: A light diverting device for diverting a part of the light energy transmitted through an optical conductor rod and for taking it out of the optical conductor. The device is comprised of a first optical conductor rod having a through-hole in a radial direction, a second optical conductor rod tightly inserted into the through-hole at the halfway point and firmly fixed thereon, a third optical conductor rod tightly inserted into a remaining portion of the through-hole, and a fourth optical conductor rod firmly fixed on an outer circumferential surface of the first optical conductor rod so as to cover the inserted portion of the second optical conductor rod. Optical oil is enclosed between an inclined surface of the second optical conductor rod and the third optical conductor rod. The third optical conductor rod is constructed movably inside the through-hole.

Abstract: A light diverting and switching device connected in cascade between a transparent cylindrical optical conductor at a light source side and another transparent cylindrical optical conductor at a light emission side for diverting and picking up a part of light transmitted through the optical conductor.

Abstract: A photoradiator in the form of an elongate light conducting member is formed with at least one strip of light diffusing material, spiral groove or annular groove, which serves as light radiating means. Light input into one end of the light conductor is routed therethrough to be radiated radially outwardly of the light conductor by the radiating means. Despite a small diameter and flexibility of the light conductor, the grooves, either spiral or annular, are formed accurately and efficiently with the light conductor held stable in position. The light radiation efficiency is increased by a flat reflector located at the other end of the light conductor, the pitch of the radiating means which progressively decreases toward the other end of the light conductor, and/or, in the case of grooves, the depth of the radiating means which progressively increases toward the other end of the light conductor. A protective casing hermetrically encloses the periphery of the light conductor at a spacing therefrom.

Abstract: An optical conductor connection includes two axially aligned optical conductors to be connected, one of the optical conductors including a protecting tube having one longitudinal end portion which is an enlarged end portion having first threading thereon, and the other of the optical conductors including a protecting tube having another longitudinal end portion having second threading thereon. Each of the optical conductors further includes an optical conductor rod disposed axially in the respective protecting tube and spacers between the rod and the respective protecting tube for supporting the rod within the protecting tube in spaced relationship relative to the respective protecting tube. A sleeve is disposed between each protecting tube and rod of the two optical conductors and extends longitudinally between the two axially aligned optical conductors.