| 摘要 |
A beam direction controlling device (22; 30; 45; 60; 80), for controlling a direction of a light-beam emitted by a light-source (21) and passing through the beam direction controlling device (22; 30; 45; 60; 80). The beam direction controlling device comprises a first optical element (23, 31; 46; 61) having first (32) and second (33) opposing faces and being configured to change a direction of a plurality of parallel light-rays (40) incident on the beam direction controlling device (22; 30; 45; 60; 80) in an incident direction (ri) at the first face (32) of the first optical element (23, 31; 46; 61) to a primary direction (rp), different from the incident direction (ri), at the second face (33) of the first optical element (23, 31; 46; 61); and a second optical element (24, 32; 47; 62) having first (36) and second (37) opposing faces, the second optical element (24, 32; 47; 62) being arranged with the first face (36) of the second optical element (24, 32; 47; 62) facing the second face (33) of the first optical element (23, 31; 46; 61), the second optical element (24, 32; 47; 62) being configured to change a direction of the plurality of light-rays from the primary direction (rp) at the first face (36) of the second optical element (24, 32; 47; 62) to a secondary direction (rs) at the second face (37) of the second optical element (24, 32; 47; 62) depending on points (41) of incidence of the light-rays on the first face (36) of the second optical element (24, 32; 47; 62). The beam direction controlling device is configured to allow relative movement between the first and second optical element for controlling the points of incidence of the light rays on the first face of the second optical element, thereby enabling control of the direction of the light-beam.
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