Light source with acousto-optic deflector and afocal lens system

摘要

The light source comprises a light emitter (31) which emits a plurality of beams of light (32) of different colors, a deflector (33) which receives said plurality of different color beams and which deflects them through angles Oi which are a function both of an input control signal (36) and of the wavelength of the light being deflected. An optical system (37) receives said divergent beams of different colors and focuses them to a single point (39). Said point can be used to trace lines on a screen under the control of the control signal to the deflector, and the optical system avoids color fringing.