Incremental printing of symbolic information – Ink jet – Controller
Reexamination Certificate
2006-01-24
2006-01-24
Pham, Hai (Department: 2853)
Incremental printing of symbolic information
Ink jet
Controller
C347S007000, C347S081000
Reexamination Certificate
active
06988783
ABSTRACT:
An inkjet printing apparatus is adapted to use a non-contact method for detecting the presence and the amount of liquid, in the form of ink droplets discharged from a printhead or ink tank, using electromagnetic waves in the form of infrared rays. The apparatus and method employ an infrared sensor to detect infrared radiation emitted by the ink in proportion to the amount of ink present. The apparatus and method further employ one of various shielding members to prevent the intrusion of infrared radiation noise into the infrared sensor field of detection, and, in some aspects, a fan to control air flow within the field of detection. The result is less noise in the detection signals of the infrared sensor, and therefore a more sensitive and more reliable liquid detection method and liquid detection apparatus.
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Ikeda Tetsuhito
Inui Toshiharu
Kato Masao
Takagi Shinji
Yano Kentaro
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Nguyen Lam
Pham Hai
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