Method and apparatus for sensing contamination within an optical

Details Method and apparatus for sensing contamination within an optical Method and apparatus for sensing contamination within an optical

1989-11-08

1991-01-01

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355204, 355215, G03G 2100

Patent

active

049822330

ABSTRACT:
A sensor array is positioned in the optical scanning system of a copier so as to be able to periodically provide a measurement of the degree of image degradation present in the system due to contamination of the optical system components. The sensor array is adapted to measure the modulation transfer frequency of a bar chart which is exposed in the optical system. The measured value of MTF is compared to a predetermined value of MTF representing a uncontaminated measurement at the bar chart. When the comparison indicates that the measured MTF is below a minimum acceptable threshold value, a display is activated to alert an operator that an optic system cleaning operation is required.

REFERENCES:
patent: 4555621 (1985-11-01), Buchar
patent: 4811114 (1989-05-01), Yamamoto et al.
patent: 4815842 (1989-03-01), Flint et al.
patent: 4841337 (1989-06-01), Hiratsuki et al.

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