Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1996-04-10
1997-04-15
Pham, Hoa Q.
Optics: measuring and testing
By particle light scattering
With photocell detection
250574, G01N 2100
Patent
active
056215240
ABSTRACT:
In an ink jet recording device having a print head wherein an expanding bubble formed in ink ejects an ink droplet from an orifice, a method for testing wafers on which a large number of print heads are formed is provided wherein the head is filled with pure water, water droplets of the pure water is ejected by application of a start signal to the print head, ejected water droplets is irradiated with condensed light, and the condensed light scattered by the ejected water droplets is detected. The time at which the scattered light was detected is correlated with time of the start signal, and it is determined whether the head is good or not according to the correlation of the time at which the scattered light was detected and the time of the start signal.
REFERENCES:
patent: 5357117 (1994-10-01), Hayashi et al.
patent: 5411682 (1995-05-01), Nagashima
J. Baker et al.; "Design and Development of a Color Thermal Inkjet Print Cartridge"; Hewlett-Packard Journal, Aug. 1988, pp. 6-15.
Nikkei Mechanical, Dec. 28, 1992 edition, pp. 58-63.
Hitachi Koki Co,. Ltd.
Pham Hoa Q.
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