G - Physics – 01 – F
Patent
G - Physics
01
F
340/140, 341/88
G01F 1/56 (2006.01) B41J 2/125 (2006.01)
Patent
CA 1108729
METHOD AND APPARATUS FOR DETERMINING THE VELOCITY OF A LIQUID STREAM OF DROPLETS Abstract of the Disclosure A pressurized ink jet stream is broken up into droplets spaced substantially uniform distances by application of a predetermined frequency to the stream. When the velocity of the stream is to be determined, a frequency perturbation is placed in the predetermined frequency to produce a gap in the stream of droplets at a selected distance from the perturbation application point. The presence of the gap is optically sensed at the selected distance by determining when the time period between adjacent droplets at the selected distance exceeds a predetermined period of time. The velocity of the stream is determined in accordance with the time that it takes from the perturbation of the gap until the gap is sensed at the selected distance because of the time period between adjacent droplets exceeding the predetermined period of time. After the velocity of the stream is determined, it is compared with a desired velocity, and corrections in the pressure of the stream are made in accordance with the difference between the determined velocity and the desired velocity and whether the determined velocity is larger or smaller than the desired velocity so that the velocity of the stream can be corrected to be within a predetermined range of the desired velocity.
305789
Meece Kermit A.
Taylor Thomas S.
Gowling Lafleur Henderson Llp
International Business Machines Corporation
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