Apparatus for grey level printing using a binary architectured p

Details Apparatus for grey level printing using a binary architectured p Apparatus for grey level printing using a binary architectured p

1990-05-10

1992-08-11

Fuller, Benjamin R.

Recorders

Light or beam recording

Including record receiver or handling means therefor

358298, G01D 942, H04N 121

Patent

active

051383373

ABSTRACT:
A binary architectured LED printhead is driven in accordance with a multiple addressable, i.e., multiple sub-lines of recording, scheme to record grey level pixels. Respective sub-lines are recorded using a series of pulses that form a set of binary-weighted exposure strobe durations. Exposure durations for recording successive strobed sub-lines with a particular LED are ordered so that larger duration strobe pulses are followed by shorter duration strobe pulses. A plurality of strobe enable lines are provided to which respective recording elements are connected. A pulse from this set is generated during a sub-line exposure period on each enable line with each enable line having a pulse generated thereon that is of a different duration than that generated on the other enabling lines during the sub-line recording period and wherein during a sub-line exposure period the respective pulses on the enabling lines are substantially nonconcurrent.

REFERENCES:
patent: 4074320 (1978-02-01), Kapes et al.
patent: 4525729 (1985-06-01), Agulnek et al.
patent: 4630068 (1986-12-01), Ims
patent: 4750010 (1988-06-01), Ayers et al.
patent: 4779102 (1988-10-01), Sasaki
patent: 4806950 (1989-02-01), Sekine et al.
patent: 4835551 (1989-05-01), Ng

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