Method and apparatus for the correction of the position error of

Details Method and apparatus for the correction of the position error of Method and apparatus for the correction of the position error of

1981-12-02

1983-09-13

Griffin, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

H04N 104

Patent

active

044045964

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 generated 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 correction during the actual operation synchronously with the mirror surfaces simultaneously located in the beam path. Light deflectors are employed as correction elements. Employing the 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 the 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.

REFERENCES:
patent: 4002830 (1977-01-01), Brown et al.
patent: 4204233 (1980-05-01), Swager
patent: 4270131 (1981-05-01), Tompkin

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