A light guide apparatus that can redirect light impinging on the apparatus over a wide range of incident angles and can concentrate light without using a tracking system and methods for fabrication. This apparatus uses conditions of total internal reflection and refraction near the critical angle for total internal reflection (near TIR) in order to trap light within the apparatus.

A light-concentrating lens assembly for a solar energy system, the assembly comprising a plurality of concentrically arranged paraboloid mirror reflectors, a conical light guide extending below the plurality of paraboloid mirror reflectors, an inner central cone disposed along a central axis of the concentrically arranged paraboloid mirror reflectors, and a compound paraboloid concentrator disposed beneath the inner central cone.

A mirror (31) that reflects solar light, a rear plate (35) that supports a rear surface of the mirror (31), and a support frame (36) that is disposed on a rear surface of the rear plate (35) are prepared. Next, the rear plate (35) and the support frame (36) are joined to each other. Moreover, an adhesive agent is disposed between the mirror (31) and the rear plate (35), the mirror (31), the rear plate (35), and the support frame (36) are elastically deformed so that a reflecting surface of the mirror (31) forms a target three-dimensional curved surface, using a lower mold (51) and an upper mold (52), and the elastically deformed state is maintained until the adhesive agent is cured.

A disc-type concentrator comprises a disc rack vertical post, a disc rack, a rotating shaft, a rotating reflection mirror, a power driving device, and a control system. The rotating shaft is arranged on the disc rack and rotatably connected with the disc rack. The rotating reflection mirror is arranged on a side of the rotating shaft and fixedly connected with the rotating shaft. The power driving device is arranged on the disc rack or on the back surface of the rotating reflection mirror and driving the rotating reflection mirror to rotate. The control system is connected with the power driving device and controlling the working state of the power driving device.

A light guide apparatus that can redirect light impinging on the apparatus over a wide range of incident angles and can concentrate light without using a tracking system and methods for fabrication.