Importance

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Abstract

An apparatus for determining the time at which a charged droplet is at a predetermined physical position comprising: first and second electrodes (1, 3) past which said droplet passes in use of said apparatus, said droplet inducing a charge on each said electrode (1, 3) as it passes; and circuitry (5, 7, 9) responsive to the charges induced on the first and second electrodes (1, 3) for determining the time at which said droplet is at said predetermined physical position midway between said electrodes (1, 3). An apparatus for measuring the velocity of a charged ink droplet generated by an ink jet printing system comprising: first and second spaced pairs of electrodes (23, 25, 27, 29) past which said droplet passes in use of said apparatus, said droplet inducing a charge on each said electrode (23, 25, 27, 29) of the pairs as it passes, and circuitry (35, 41, 43) responsive to the charges induced on the electrodes (23, 25, 27, 29) for determining the time at which said droplet is midway between the first pair of electrodes (23, 25) and the time at which the droplet is midway between the second pair of electrodes (27, 29), the velocity measurement being provided by dividing the distance between these two midway points by the time between the times at which the droplet is at these two midway points.

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First Claim