Recorders – Light or beam recording – Including record receiver or handling means therefor
Patent
1991-11-04
1992-11-24
Fuller, Benjamin R.
Recorders
Light or beam recording
Including record receiver or handling means therefor
323315, G01D 1514, G01F 320
Patent
active
051667029
ABSTRACT:
A non-impact printhead for use in recording on a recording medium includes a plurality of energizable recording elements such as LED's. Integrated circuit driver chips are provided that include a current mirror having a master circuit for generating a reference current and a plurality of slave circuits for providing respective driver currents to the recording elements selected for energization. A transistor switch is in series with a respective recording element and switchable from one state to another in response to a signal at its control electrode. An enabling circuit operating upon the control electrode switches the transistor switch to allow current to be selectively provided to the recording element for a predetermined period of time. Each of the slave circuits include an additional slave circuit which provides a current path for facilitating changing of the signal at the control electrode from on voltage level to another such as by allowing a capacitive charge at the control electrode to dissipate. A reference voltage is generated for driving the recording elements. A second transistor in series with the transistor switch establishes a first voltage signal that is input to one electrode of the transistor switch. The first voltage signal varies with variations in the reference voltage. The additional slave circuit generates a voltage signal at the control electrode of the transistor switch means that varies with the reference voltage. Thus, variations in the reference voltage will not substantially affect the level of current driven to the LED's during recording of a pixel.
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Chung Jeremy K.
Kieffer Kenneth D.
Mattern Michael W.
Eastman Kodak Company
Fuller Benjamin R.
Rushefsky Norman
Yockey David
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