Incremental printing of symbolic information – Ink jet – Controller
Patent
1997-09-26
2000-08-22
Royer, William J.
Incremental printing of symbolic information
Ink jet
Controller
73290R, 118694, B41J 2195
Patent
active
061060879
ABSTRACT:
A detection apparatus that utilizes a CR oscillating circuit and detects residual ink quantities in an ink cartridge. The CR oscillating circuit is constructed from a capacitor C in which the capacitance value changes according to the residual ink quantity and a logic integrated circuit. A pulse signal frequency is oscillated by the logic integrated circuit based on the quantity of residual ink. Therefore, the quantity of residual ink is detected by counting the number of pulses of the pulse signal over a predetermined period of time based on the frequency of the pulse signal output from the logic integrated circuit. Thereby, digital processing can be conducted by directly using logic signals output from the logic integrated circuit without using an A/D converter.
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Brother Kogyo Kabushiki Kaisha
Royer William J.
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