Light emitting device capable of readily controlling total quant

Details Light emitting device capable of readily controlling total quant Light emitting device capable of readily controlling total quant

1991-02-13

1993-07-20

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Picture signal generator

358474, H04N 104

Patent

active

052298701

ABSTRACT:
Improved driving circuitry for a light source used in a dot matrix display board, a copying machine or a facsimile machine is disclosed. The light source includes a plurality of light emitting diodes (D11 to D44) each connected in parallel, and the quantity of light from each of the light emitting diodes can be balanced by providing proper resistors (R1 to R4). Additionally, the control of the total quantity of light from the light emitting diodes can be readily performed, since the total driving current is changed by changing the value of a variable resistor (Rv1).

REFERENCES:
patent: 4706128 (1987-11-01), Tanioka et al.
patent: 4789903 (1988-12-01), Kamada et al.
patent: 4954914 (1990-09-01), Karita et al.
"Nikkei Electronics" (No. 470, Apr. 3, 1989) p. 159.

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