Non-impact printer with token bit control of data and current re

Details Non-impact printer with token bit control of data and current re Non-impact printer with token bit control of data and current re

1990-06-26

1992-06-30

Fuller, Benjamin R.

Recorders

Light or beam recording

Including record receiver or handling means therefor

358302, G01D 842, H04N 1032

Patent

active

051267594

ABSTRACT:
An LED printhead or the like includes a data bus for carrying multibit digital image data signals for grey level recording. A token bit signal is generated and shifted through registers upon the printhead to enable image data registers associated with each LED to latch the image data signals in appropriate order. The image data signals control the energization times for recording pixels. A digitally adjustable current mirror controls the level of current to each LED during recording. Digital current data signals for controlling this level of current are also communicated over one of the lines of the data bus. A token bit signal is also used to control the latching of current data signals in registers storing the digital data used for current control.

REFERENCES:
patent: 3850517 (1974-11-01), Stephany et al.
patent: 4168531 (1979-09-01), Eichelberger et al.
patent: 4598358 (1986-07-01), Boddie et al.
patent: 4746941 (1988-05-01), Pham et al.
patent: 4750010 (1988-06-01), Ayers et al.
patent: 4831395 (1989-05-01), Pham et al.
patent: 4885597 (1989-12-01), Tschang et al.
patent: 5025322 (1991-06-01), Ng

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