Patent ID: 11947241
Assignee: MYCRONIC AB
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 12:
13. A method of writing an image to a radiation sensitive surface, the method including:
using an acousto-optical deflector, abbreviated AOD, a first expander before the AOD, a second expander following the AOD, and one or more additional lenses all aligned on an optical path, wherein the AOD has an entrance window with a high-aspect ratio in a range of 15:1 to 60:1, and an acousto-optical medium with a speed of sound along a scanning y direction of between 2500 and 11,225 m/s, and said acousto-optical medium is transmissive to input radiation having a wavelength selected from a range of 225 to 350 nm;
reshaping, by lenses included in the first expander, the input radiation from a source to a high-aspect ratio beam and relays the high-aspect ratio beam to the AOD;
reshaping, by lenses included in the second expander, the high-aspect ratio beam from an AOD exit after deflection by the AOD to a writing beam; and
magnifying, by the additional lenses, a deflection angle at the AOD exit to a larger sweep angle of the writing beam along a radiation sensitive surface.