| 摘要 |
An optical projection system comprises a light source made up from a plurality of substantially point light sources in the form of light emitting diodes each of which produces a light beam whose solid angle of divergence is less than one steradian and a converging lens or reflector, each point light source being positioned in relation to the lens or reflector such that its light beam is collimated by the lens or reflector. The axes of the light beams from the light emitting diodes are so directed in relation to the principal axes of the optical elements that the collimated output beams have a diverging envelope. An optical projection apparatus advantageously comprises a plurality of such projection systems arranged adjacent each other for example in a grid pattern and also advantageously the lenses or reflectors are formed integrally with one another. |
