Patent ID: 6923174
Filing Date: 2005-08-02
Classification: F21S,F24S,G02B,G05D,Y02E

Abstract:
1. An optical apparatus comprising: a receiver comprising a solar element, wherein incident light from a light source, preferably sunlight, is passed on to the solar element, a transparent or reflective optical body, and a tracking device for moving the optical body in a tracking direction, wherein the tracking device is controlled in dependence on the variation with respect to time of the relative position of the light source and the receiver, preferably in dependence on the position of the sun, wherein the optical body comprises different regions selected from diffractive regions, refractive regions and holographic regions, which deflect, concentrate or deflect and as well concentrate the light, wherein the optical body is formed as a foil, or the optical body is attached to a further foil, or the optical body is formed as the foil, which is attached to the further foil, wherein the optical body has a plurality of different portions along the tracking direction due to the different regions, wherein the different portions differ by one or more optical parameters, wherein the optical body is positioned by the tracking device with relative movement with respect to the receiver by rolling up and unrolling the foil, wherein one or more different portions of the optical body are brought into or out of an operative position, wherein in the operative position the light is passed via the respective one or more different portions of the solar element, and wherein the foil is positioned so that light is passed on to the solar element and that at least one of the different portions is associated with the solar element and a first different portion co-operates for a first period of time of one or more days with the solar element and a second different portion adjacent the first different portion co-operates for a subsequent second period of time of one or more days with the solar element.