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US 4,750,010 AGranted
Circuit for generating center pulse width modulated waveforms and non-impact printer using same
AssigneeEastman Kodak Company
InventorsCharles E. Ayers, Kenneth D. Kieffer, Yee S. Ng, Hieu T. Pham, Pin S. Tschang, Eric K. Zeise
Life of this patent
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Abstract
A circuit for generating a set of center pulse-width modulated waveforms comprises a counter having a time changing count, and comparators which compare the count with respective preset counts. The preset counts to the comparators being set so that the set of waveforms created is center pulse-width modulated.
Claims9
A circuit for generating a center pulse-width modulated set of waveforms, the circuit comprising:
- digital counting means having a plurality of output lines representing in digital form a time changing numerical count;
- clock means coupled to the digital counting means for changing the count represented by the output lines;
- and
- comparator means coupled to the output lines and comparing the time changing count with each of several different predetermined counts and generating respective pulses each of which commences with a respective predetermined count and terminates with a respective predetermined count the time duration of each pulse being different dependent upon the respective predetermined count selected and the respective predetermined counts also being selected so as to establish a common center time point for the set of waveforms.
1 more element
A non-impact printer which comprises:
- an array of radiation emitting elements;
- an imaging surface adapted to receive the radiation;
- means for selectively enabling the elements for predetermined periods of time during a cycle of operation to form an image on the surface;
- the enabling means including circuit means for generating a center pulse-width modulated set of waveforms for determining the enabling time of selected elements;
- and wherein the circuit comprises:
- digital counting means having a plurality of output lines representing in digital form a time changing numerical count;
- clock means coupled to the digital counting means for changing the count represented by the output lines;
- and
- comparator means coupled to the output lines and comparing the time changing count with each of several different predetermined counts and generating respective pulses each of which commences with a respective predetermined count and terminates with a respective predetermined count the time duration of each pulse being different dependent upon the respective predetermined count selected and the respective predetermined counts also being selected so as to establish a common center time point for the set of waveforms.
6 more elements
Dependencies are inferred from the claim text.