G - Physics – 01 – D
Patent
G - Physics
01
D
222/1, 101/96.02
G01D 15/16 (2006.01) B41J 2/045 (2006.01)
Patent
CA 1107800
ABSTRACT OF THE DISCLOSURE A coincidence ink jet principle is disclosed wherein each ink jet has two inlet passages communicated to an outlet orifice. Each inlet passage is communicated to a respective transducer chamber. The fluid displacement and fluid velocity effected by a pressure pulse generated by each transducer chamber in a respective inlet passage is insufficient to express a droplet from the orifice. However, the combined fluid dis- placement and fluid velocity, which is the result of the pressure pulses generated by the transducers being coincident at the orifice, will result in a droplet being expressed from the orifice. In one system disclosed utilizing the above described principle, each inlet passage of a jet is communicated to a respective transducer and each transducer is connected to a respective electronic driver. In this system, the number of electronic drivers and transducer chambers are substantially less than the number of ink jets. These transducer chambers are time shared for expressing an ink droplet. Actuation of the two transducer chambers communicated to a particular jet, in such a manner that the pressure pulses generated by the respective transducers co- incide at the orifice, will effect expression of a droplet there- from. In another system disclosed utilizing the above described principle, a master transducer chamber is communicated to a sep- arate respective droplet expression transducer chamber and each droplet expression transducer chamber is connected to a respective electronic driver. In this system, the master transducer chamber is actuated to create at each orifice a pressure pulse which is below the threshold pressure pulse for expressing an ink droplet therefrom. Actuation of any of the droplet expression transducer chambers to generate a pressure pulse which coincides at a partic- ular orifice with the pressure pulse generated by the master transducer, will bring the resultant pressure pulse at the orifice above threshold to effect expression of the droplet from a partic- ular orifice.
284779
Fischbeck Kenneth H.
Schnarr Marcus M.
Gowling Lafleur Henderson Llp
Xerox Corporation
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