Method and apparatus for wobble correction using an agile beam polygon ros and all-spherical optics.

摘要

Facet-to-facet pyramidal wobble is corrected without resorting to cylindrical optics by adapting agile beam concepts to provide real-time control of the light beam position on the photoreceptor. The agile beam is provided by either or both of a variable wavelength light source (202) or a variable index of refraction prism (232). The position of the light beam is determined by either or both of a super linear position detector (224) directly detecting the position of the light beam, or a facet detector (234) and a look-up table for indirectly estimating the position of the light beam. By actively compensating for pyramidal wobble, the passive but expensive and difficult-to-position cylindrical optics can be replaced with cheap and easy-to-position spherical optics (204, 218). <IMAGE>