Patent ID: 6137640
Filing Date: 2000-10-24
Classification: B41J,G02B,G05B,G11B

Abstract:
An article of manufacture for adjusting the focus of a beam of radiation emitted along a beam path by a radiation generator, the radiation beam being focussed by a beam focussing device disposed in the beam path and positioned between the radiation generator and a medium support member for supporting a medium to be imaged, the medium support member having a first temperature sensor mounted thereto, and the radiation generator being positioned a first distance from the medium support member with the medium support member at a first temperature, comprising:computer readable storage medium; andcomputer programming stored on said storage medium;wherein said stored computer programming is configured to be readable from said computer readable storage medium by a computer and thereby cause said computer to operate so as to:receive a first signal from the first temperature sensor representing a second temperature of the medium support member which is different than the first temperature,process the first signal so as to generate a correction signal for adjusting the beam focus to correspond to the second temperature of the medium support member; andtransmit the correction signals responsive to which the focus device operates to adjust the beam focus.