Non-impact printer apparatus with improved current mirror driver

Details Non-impact printer apparatus with improved current mirror driver Non-impact printer apparatus with improved current mirror driver

1988-12-27

1989-12-05

Evans, Arthur G.

Boots, shoes, and leggings

346154, G01D 1500

Patent

active

048855979

ABSTRACT:
An improved printer apparatus includes a print head having a series of point-like radiation sources, such as LED's, arranged in a row for exposing a recording medium. Logic means is provided for determining which of the point-like radiation sources are to be selected for energization. A current driver means responsive to the logic means provides electrical current to the radiation sources selected. A current driver means include a current mirror having a master circuit for generating a reference current and a plurality of slave circuits for providing respective driver currents to the radiation sources selected for energization. The master circuit includes a series of parallel connected transistors that may be instantaneously reprogrammed by digital control signals to said transistors. The characteristics of the transistors vary so that currents from them are scaled by say powers of two to provide an expanded current control capability. Environmental conditions and/or aging often require change in current to maintain desired recording performance. The need for such change may be automatically sensed and a new digital control word sent to the transistors to adjust current to the radiation sources.

REFERENCES:
patent: 4746841 (1988-05-01), Pham et al.
patent: 4831392 (1989-05-01), Dei

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