Incremental printing of symbolic information – Thermal marking apparatus or processes – Gradational recording
Patent
1993-05-06
1995-09-19
Tran, Huan H.
Incremental printing of symbolic information
Thermal marking apparatus or processes
Gradational recording
358298, 347209, B41J 236
Patent
active
054519853
ABSTRACT:
An area gradation control device and method for a thermal printing thermosensitive recorder, such as a color video printer or a facsimile, performs a printing operation by converting color-corrected and gamma-corrected data into area gradation signals. One bit among 8-bit data is sequentially selected according to gradations and transmitted to a thermal printing head, and strobe pulses whose number corresponds to the weight value of each bit are provided to the thermal printing head for each time a selected significant bit is provided to the thermal printing head, so that dye deposition is uniformly performed over the overall area of a pixel with a high data processing speed.
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patent: 4806949 (1989-02-01), Onuma et al.
patent: 4899170 (1990-02-01), Izumi
M. D. Fiscella et al., "Pulse count modulation: a novel head drive method for thermal printing," Photographic Research Laboratory, Eastman Kodak Company, Rochester, New York 14650-01824 (1990).
Goldstar Co. Ltd.
Tran Huan H.
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