Ink droplet sensors for ink jet printers

Details Ink droplet sensors for ink jet printers Ink droplet sensors for ink jet printers

1989-09-26

1991-02-05

Reynolds, Bruce A.

Recorders

Plural-function recorder, distinguishable recordings

25022711, G01D 1518, H01J 516

Patent

active

049909320

ABSTRACT:
Improved differential optical sensors are mounted at every intersection of the deflection planes of the ink droplets issued by a multi-nozzle printhead of a pagewidth ink jet printer. These sensors are located near the printing plane and gutters of the printer. They comprise first and second input apertures, each being coupled to a light source and fixedly located to direct beams of light to a confronting associated pair of output apertures. The input and output apertures are on opposite sides of the droplet deflection plane, and the input apertures are on opposite sides of a perpendicular line extending from the midpoint between the pair of output apertures. The light beams impinge the pair of output apertures thereby creating differentially detected zero-crossing optical axes at predetermined angles with respect to the perpendicular line therefrom. The output apertures are coupled to differential circuitry via photodetectors, so that horizontal droplet position may be determined relative to droplet charge voltage and vertical droplet position may be measured in absolute value above the output apertures.

REFERENCES:
patent: 4255754 (1981-03-01), Crean et al.
patent: 4344078 (1982-08-01), Houston
patent: 4498004 (1985-02-01), Adolfsson et al.
patent: 4510504 (1985-04-01), Tamai et al.
patent: 4550322 (1985-10-01), Tamai
patent: 4551731 (1985-11-01), Lewis et al.
patent: 4751517 (1988-06-01), Crean et al.

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