B - Operations – Transporting – 41 – J
Patent
B - Operations, Transporting
41
J
B41J 2/385 (2006.01) H03B 5/20 (2006.01)
Patent
CA 2564229
An electron beam printer assembly for operating a standard electron beam print cartridge (such as an eighteen inch 600 DPI print cartridge) includes an RF generator which has a powdered iron core transformer, and a dual pulse width generator operatively connected to the transformer. The RF generator also includes a power driver, control logic, and an oscillator feedback circuit. The dual pulse width generator may comprise a NOR gate, a capacitor, two resistors, and a diode, all connected to an adjustable voltage source. The transformer core may be toroid-shaped and of carbonyl SF. Using this RF generator it is possible to image a substrate moving at a speed of greater than 200 FPM, and to operate at a frequency of about 5 MHz in an efficient manner, to eliminate print gradients due to an overdriven transformer, to eliminate transformer temperature failures due to core loss, and to provide greater flexibility in transformer construction and design, and less power loss in the transformer drive transistor.
Moore Wallace North America Inc.
Ridout & Maybee Llp
LandOfFree
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