Non-impact printhead and driver circuit for use therewith

Details Non-impact printhead and driver circuit for use therewith Non-impact printhead and driver circuit for use therewith

1991-09-23

1993-10-26

Fuller, Benjamin R.

Recorders

Light or beam recording

Including record receiver or handling means therefor

341153, 323315, G01D 1500, H03M 180, G05F 316

Patent

active

052570398

ABSTRACT:
A non-impact printhead, for example one that includes a plurality of LEDs, is driven by a current that is programmed to have a linear temperature profile with a desired slope. The change in current with temperature facilitates maintaining of LED uniformity. Linearity between various stages of driver circuitry is maintained by a digital-to-analog converter that includes transistors arranged in a common centroid configuration. Driver current to each LED is provided by a master slave circuit that is dedicated to each LED. Thus, cross-talk between LED channels is minimized.

REFERENCES:
patent: 3936725 (1976-02-01), Schneider
patent: 3978473 (1976-08-01), Pastoriza
patent: 4442398 (1984-04-01), Bertails
patent: 4645948 (1987-02-01), Morris et al.
patent: 4658240 (1987-04-01), Bixby
patent: 4864215 (1989-09-01), Schouwenaars et al.
patent: 4872011 (1989-10-01), Pelgrom et al.
patent: 4885597 (1989-12-01), Tshang et al.
patent: 5015942 (1991-05-01), Kolanko
patent: 5017919 (1991-05-01), Hull et al.
patent: 5099205 (1992-03-01), Lewyn
"Analysis and Design of Analog Integrated Circuits", Article, 2nd Ed., pp. 733-735, by Gray and Meyer.

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