Print head with multiplexed resistances controlling supply of cu

Details Print head with multiplexed resistances controlling supply of cu Print head with multiplexed resistances controlling supply of cu

1996-06-27

1997-09-23

Yockey, David F.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347240, 347 13, 347182, 347183, 347188, 358296, 358298, B41J 247, B41J 2938, B41J 2355, H04N 123

Patent

active

056710020

ABSTRACT:
In an LED head operated on a time sharing basis, a multiplexer switches resistances for determining LED currents on LED arrays and assigns appropriate resistance to each array. The multiplexer is operated by block select signals of a block select circuit for time sharing operation, where the number of resistances corresponds to the number of blocks. The multiplexer capacity may also be less than the number of blocks, where the number of resistances less than the number of blocks and the same resistances correspond to more than one block. Output dispersions between arrays are adjusted by appropriate assignment of the resistances. sharing operation. Capacity of the multiplexer correspond to the number of blocks required for time. Gray scale printing is achieved by switching the current determining resistances in accordance with shading degree of image with the multiplexer.

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patent: 4814886 (1989-03-01), Kuge et al.
patent: 4928118 (1990-05-01), Leksell et al.
patent: 5062002 (1991-10-01), Dahlquist et al.
patent: 5062115 (1991-10-01), Thornton
patent: 5099192 (1992-03-01), Thayer et al.
patent: 5150016 (1992-09-01), Sawase

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