H - Electricity – 04 – N
Patent
H - Electricity
04
N
88/96.8
H04N 1/04 (2006.01) G02B 26/12 (2006.01) G02B 27/00 (2006.01)
Patent
CA 1170875
ABSTRACT Positional errors are corrected for a light beam which is deflected point and line-wise across a scanning surface by a polyhedral rotating mirror. For each mirror surface, the positional errors are measured in the line direction and perpendicular thereto at a plurality of measuring points oriented in the line direction in the area of the scanning surface. Correction values are ge- nerated which, during simultaneous error measurement, are changed until the positional errors are compensated by means of correction elements. The determined correction values are stored and are read out for continuous correc- tion during the actual operation synchronously with the mirror surfaces simultaneously located in the beam paths. Light deflectors are employed as correction elements. Employing said rotating mirror in a recording arrangement, transit time elements controlled by the correction values are disposed as correction elements in the signal path of the image signal for the correction of the positional errors in line direction. If the image signal is stored, the frequency of the read clock can alternately be changed as a function of the correction values. The method is very accurate so that, in particular, errors caused by uneven mirror surfaces are corrected.
391247
Juergensen Heinrich
Zelenka Thomas
Rudolf Hell G.m.b.h.
Smart & Biggar
LandOfFree
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