Self-referencing start of plot system and method

Details Self-referencing start of plot system and method Self-referencing start of plot system and method

1989-12-22

1991-09-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023117, H01J 314

Patent

active

050476319

ABSTRACT:
A start of plot mark consists of three portions, a first, second and third portion each of equal area with the first and second portions being above a reference line and spaced from each other by the second portion which is below the reference line. The first and second portions are used to generate a reference signal for use in measuring the zero crossing of the output signal from the start of plot mark thereby to automatically compensate for uncertainties in the zero crossing such as those uncertainties produced by differences in intensities of the start of plot coloration versus the background coloration of the print medium, differences in reflectivity and illumination of the print medium, and imbalances between sensor output signals.

REFERENCES:
patent: 4448503 (1984-05-01), Axelrod et al.
patent: 4549084 (1985-10-01), Markle
patent: 4731542 (1988-05-01), Doggett
patent: 4808832 (1989-02-01), Doggett

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