Method and apparatus to control overall write length in LED prin

Details Method and apparatus to control overall write length in LED prin Method and apparatus to control overall write length in LED prin

1991-10-09

1993-03-09

Grimley, A. T.

Recorders

Light or beam recording

Including record receiver or handling means therefor

165100, 346157, 355219, 355326, 361382, 361388, G01D 942

Patent

active

051929589

ABSTRACT:
Overall length of LED print bars arranged in a single pass printing system is controlled by controlling the operating temperature of the LED arrays forming the light emitting portion of the print bar. Rather than trying to maintain the arrays at some predetermined temperature, the array temperatures are allowed to vary over a predetermined range but within this range, the arrays are all at the same temperature. This is accomplished by mounting the arrays on a common subframe which is adapted to circulate a cooling medium through each of the arrays in parallel rather than in series. Thus, each array is cooled at the same rate and will attain the same equilibrium temperature, thus ensuring that registration will be accomplished within each single pass operation.

REFERENCES:
patent: 4601328 (1986-07-01), Tasaka et al.
patent: 4611901 (1986-09-01), Kohyama et al.
patent: 4865123 (1989-09-01), Kawashima et al.
patent: 4896168 (1990-01-01), Newman et al.
patent: 5121146 (1992-06-01), Smith et al.

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