Incremental printing of symbolic information – Electric marking apparatus or processes – Electrostatic
Patent
1998-10-22
2000-08-08
Brase, Sandra
Incremental printing of symbolic information
Electric marking apparatus or processes
Electrostatic
B41J 2385, G03G 1304
Patent
active
061009083
ABSTRACT:
Driving electric current values of a semiconductor laser when detected light amount values are equal to each of five light amount values having respectively different magnitudes are detected. Thus, five detecting points relating to a light amount value-driving electric current value characteristic are obtained. A differential efficiency .eta. at an interval between two adjacent detecting points is calculated. For example, a differential efficiency .eta.1 is calculated from an adjacent detecting point and a differential efficiency .eta.2 is calculated from another adjacent detecting point. Further, values of the differential efficiencies are displayed on a display so that an operator can recognize an exact deteriorated state of an LD from the values of the differential efficiencies.
REFERENCES:
patent: 4144539 (1979-03-01), Davie et al.
patent: 4443695 (1984-04-01), Kitamura
patent: 5463410 (1995-10-01), Uchiyama et al.
Brase Sandra
Fuji 'Xerox Co., Ltd.
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