| 摘要 |
The invention provides a method and apparatus for providing a uniform output from an optical transmitter. The invention comprises at least one discrete light source (30), and a housing (38) defining an internally reflecting volume (42) for light from the at least one light source, the housing having a light exit aperture (46) for light from the at least one light source. The reflecting volume is adapted to produce in an extended image surface multiple reflected images (50) of the at least one light source, and the light exit aperture is arranged to emit light from the multiple reflected images. An output lens (48) is employed in front of the light exit aperture for controlling the angular distribution of the light emitted from the at least one light source and the multiple reflected images by way of the light exit aperture.
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