Circuit for generating strobe signals to LED print head

Details Circuit for generating strobe signals to LED print head Circuit for generating strobe signals to LED print head

1993-08-23

1998-05-12

Yockey, David F.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347900, 358298, B41J 247, H04N 123

Patent

active

057513325

ABSTRACT:
A circuit for generating strobe signals to one line light emitting diode arrays of an light emitting diode print head, comprises: a portion for generating a start signal in response to a clock signal, a start pulse, and a synchronization pulse of a central processing unit; a counter for generating a counter signal indicative of counts of the clock signals initiated in response to the start signal; a comparator for comparing the counter signal and strobe period selection signals indicative of a selected period of the strobe signals, and for generating a comparator signal indicative of the comparison; a clock controller for generating a gating clock controlling length of the strobe signals by latching the comparator signal; a signal output portion for generating individual ones of the strobe signals in response to strobe control signals, the strobe signals having lengths determined by the gating clock; and a strobe controller for generating the strobe control signals by latching the gating clock received from the signal output portion. Consequently, strobe signal generation is accomplished without the continuous control of the central processing unit.

REFERENCES:
patent: 4806949 (1989-02-01), Onuma et al.
Mano, M. Morris, Digital Design, Prentice-Hall, Inc., Englewood Cliffs, New Jersey, 1984, pp. 172 and 356-357.

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