Solar concentrator and production method thereof
The invention relates to a solar concentrator comprising a solid body consisting of a transparent material that has a light coupling surface and a light decoupling surface, the solid body having a light guide part that tapers towards the light decoupling surface, being located between the light coupling surface and the light decoupling surface and being delimited by a light guide surface between the light coupling surface and the light decoupling surface, the light guide surface merging into the light decoupling surface with a constant first derivation. The invention also relates to a method for the production of a solar concentrator, wherein the transparent material is precision-molded between the molds.
1. A method for manufacturing a solar concentrator from transparent material having a light entry face, a light exit face and a light guide portion arranged between the light entry face and the light exit face and tapering in the direction of the light exit face, which light guide portion is restricted by a light guide portion surface between the light entry face and the light exit face, the method comprising the steps of:
providing a first mold, adapted for molding the light entry face;
providing at least a second mold, adapted for molding the light exit face;
drawing the transparent material into the second mold by means of pressure below atmospheric pressure;
press molding a transparent material between said first mold and said second mold for creating the solar concentrator, such that the light guide portion surface merges into the blank molded light exit face with a continuous first derivative, and
further comprising the steps of:
providing a photovoltaic element; and
fixedly connecting said light exit face of said solar concentrator to said photovoltaic element.
2. The method of claim 1 , wherein the transparent material is drawn into the second mold by means of the depression at least partially during said blank molding.
3. The method of claim 1 , wherein the depression is at least 0.5 bar.
4. The method of claim 3 , wherein immediately before molding, the transparent material has a viscosity of no more than 10 4.5 (dPa)(s).
5. The method of claim 1 , wherein immediately before molding, the transparent material has a viscosity of no more than 10 4.5 (dPa)(s).
6. The method of claim 5 , wherein the light exit face is not ground after press molding.
7. The method of claim 1 , wherein the light exit face is not ground after press molding.
8. The method of claim 1 , wherein the second mold is at least two-part.
9. The method of claim 1 , wherein the second mold has a gap in the region forming the transition between the light exit face and the light guide portion surface.
10. The method of claim 9 , wherein the gap has a width of between 10 μm and 40 μm.
11. The method of claim 10 , wherein the depression is generated in said gap.