Abstract: The present invention relates to a process for the production of the profile of reflective elements of a light as well as the lights obtained by this process, the light comprising at least two cylindrical reflective elements (5, 5'). This process is characterized in that it comprises the steps consisting of:defining the position of one end (R.sub.o) of the profile of each reflective element (5, 5')defining an illumination function E(.theta.) corresponding to a desired illumination curve, connected to a luminance function L(.theta.) by the formula:E(.theta.)=L(.theta.).multidot.cos.sup.2 .theta.=k?s.multidot.cos.theta.+.rho.r.multidot.sin (.phi.-.theta.)-.rho.r.sub.o sin (.phi..sub.o -.theta.)! cos.sup.2 .theta.if said end (Ro) of the profile of the reflective element (5, 5') is the downstream end of this latter, and an illumination function:E(.theta.)=L(.theta.).multidot.cos.sup.2 .theta.=k?s.multidot.cos.theta.-.rho.r.multidot.sin (.phi.-.theta.)+.rho.r.sub.o .multidot.sin (.phi..sub.o -.theta.)! cos.sup.2 .

Abstract: Reflector for source of radiation, of the plane or cylindrical type, constituted by two reflector elements disposed symmetrically with respect to a plane containing the longitudinal axis of the reflector, each reflector element is constituted by at least one cylindrical part of which the generatrices are parallel to the longitudinal axis of the reflector, the cross-section of this cylindrical part being constituted by a curve such that the rays reflected by the respective ends of this curve constitute two end rays forming respective angles with the plane of symmetry, all the rays reflected on the reflector element being included between the respective angles.

Abstract: A device for focusing parallel rays on a receiving element (20). The device is characterized in that it comprises at least one focusing element on either side of a principal plane, each said element comprising a cylindrical primary reflector the base of which consists of a parabolic curve (AA') and which is offset by a certain distance (d) with respect to the principal plane on the side of the parabolic curve (A,A'), and a secondary reflector consisting of two cylindrical elements (BCD, B'C'D'), the base of which is made up of at least one generalized involute curve (BC, B'C'), each of these curves ending with an upstream end (B,B') determining a straight segment (BB') on which is positioned the focal point (F) of the parabolic curve (AA') forming the base of the primary reflector (24), as well as a downstream end (C,C'), the focal point of each generalized involute curve (BC and B'C') consisting respectively of the end (A',A) of the parabolic curve (AA') which faces its concave portion.

Abstract: This invention relates to an apparatus emitting electromagnetic radiation, particularly infrared, which comprises a cylindrical source of rays and a reflector. In order to avoid the problem due to captive rays and to multiple reflections, the cross section of a half-reflector comprises, starting from the plane of symmetry, a first curved part constituted by an arc of involute to a circle extending from the plane of symmetry to an end located on a first extreme ray tangential to the source and passing through a first end of the target and a second curved part joined tangentially to the first curved part and of such shape that all the tangential rays emitted from the cylindrical source and falling on this second curved part are reflected towards the first end of the target located on the other side of the plane of symmetry.

Abstract: This invention relates to an apparatus emitting infrared radiation which comprises a plane source of infrared rays and a reflector. In order to avoid the problem due to captive rays and to multiple reflections, the cross section of each half-reflector located on one side of the plane of symmetry has the form of an arc of ellipse whose two foci are respectively constituted by the first end of the plane source and the first end of the target which are both located on the other side of the plane of symmetry, this arc of ellipse extending between the second end of the plane source and the point of intersection of the ellipse with the direct ray going from the first end of the plane source to the second end of the target.

Abstract: A device is provided for improving the thermal efficiency of a cylindrical radiant energy collector. A channel is placed next to and in close proximity to the nonreflective side of an energy reflective wall of a cylindrical collector. A coolant is piped through the channel and removes a portion of the nonreflective energy incident on the wall which is absorbed by the wall. The energy transferred to the coolant may be utilized in a useful manner.

Abstract: A device is provided for the collection and concentration of solar radiant energy including a longitudinally extending structure having a wall for directing radiant energy. The wall is parabolic with its focus along a line parallel to an extreme ray of the sun at one solstice and with its axis along a line parallel to an extreme ray of the sun at the other solstice. An energy absorber is positioned to receive the solar energy thereby collected.

Abstract: A device is provided for reducing convective heat loss in a cylindrical radiant energy collector. It includes a curved reflective wall in the shape of the arc of a circle positioned on the opposite side of the exit aperture from the reflective side walls of the collector. Radiant energy exiting the exit aperture is directed by the curved wall onto an energy absorber such that the portion of the absorber upon which the energy is directed faces downward to reduce convective heat loss from the absorber.