Dynamic control of individual spot exposure in an optical output

Details Dynamic control of individual spot exposure in an optical output Dynamic control of individual spot exposure in an optical output

1992-06-29

1996-03-05

Wong, Peter S.

Incremental printing of symbolic information

Electric marking apparatus or processes

Electrostatic

G01D 1514

Patent

active

054971810

ABSTRACT:
The optical energy per pulse emitted by a laser source is accurately controlled from pulse to pulse by controlling the duration of the pulse according to the integrated value of its amplitude over time. A control signal is formed by converting a portion of the optical output of the laser to an electrical signal with a photodetecting element whose electrical output signal is integrated over time. The laser excitation is terminated when the integrated photocurrent reaches a set threshold level representing the optical energy desired for the pulse. Accurate control of the optical energy in each pulse is maintained in spite of error producing conditions such as unpredictable fluctuations in the laser drive signal, ambient temperature fluctuations, transient heating, and cumulative effects due to sequences of pulses.

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