Device for driving a light receiving element to track a light source
A light tracking device comprising first and second support members and at least one light receiving element supported on each support member by one or more resilient flexible beams which deform upon relative translational displacement of the first and second support members. The first and second support members are arranged such that relative translational displacement of the members generates rotational displacement of the element. One or more resilient flexible beams may comprise spiral arms extending from the first to the second support members.
1. A light tracking device comprising:
first and second support members; and
at least one light receiving element supported on each support member by one or more resilient flexible beams which elastically deform upon relative translational displacement of the first and second support members,
wherein the first and second support members and the resilient flexible beams are arranged such that relative translational displacement of the support members elastically deforms the resilient flexible beams and generates rotational displacement of the elements,
wherein the one or more resilient flexible beams comprise spiral arms extending from the element to the first and second support members.
2. The light tracking device of claim 1 , further comprising at least one photovoltaic cell for each light receiving element positioned at a point where the light is concentrated;
wherein the at least one light receiving element is a solar concentrating element which concentrates the light.
3. The light tracking device of claim 2 , wherein the photovoltaic cell is a multiple junction photovoltaic cell.
4. The light tracking device of claim 3 , wherein the one or more resilient flexible beams are made of an electrically conductive material and wherein the resilient flexible beams are used to conduct electrical current away from the photovoltaic cell.
5. The light tracking device of claim 1 , wherein the distance between the support members is controlled by at least one passive structural element which comprises a wire connecting the first and second support members.
6. The light tracking device of claim 1 , wherein plural light receiving elements are supported on each support member, wherein the one or more resilient flexible beams comprise spiral arms extending from the element to the first and second support members.
7. The light tracking device of claim 6 , wherein the one or more resilient flexible beams comprise spiral arms extending from the element to the first and second support members.
8. The light tracking device of claim 7 , wherein one or each support member is provided with an actuator to generate the relative translational displacement.
9. A method of manufacturing first and second support members of a light tracking device, said light tracking device comprising:
the first and second support members provided in two separate and substantially parallel planes; and
at least one light receiving element supported on each support member across a gap between the two planes by one or more resilient flexible beams which elastically deform upon relative translational displacement of the first and second support members,
wherein the first and second support members and the resilient flexible beams are arranged such that relative linear translational displacement of the support members elastically deforms the resilient flexible beams and generates rotational displacement of the elements,
the method comprising the step of: cutting the resilient flexible beams and/or the first and second support members from single pieces of sheet material.
10. The method of claim 9 , wherein each of the single pieces of sheet material consists of spring steel.