OPTICAL ARRAY DROP SENSOR WITH CONTAMINATION CONTROL
Original Publication Date: 1984-Oct-31
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
An optical array drop sensor 10 for a continuous stream type ink jet printer, illustrated in the accompanying figure, provides much higher drop sensing sensitiv-ity and consistency than an electric one employing the capacitive current induced by a flying charged ink drop. However, the optical array drop sensor is much more prone to failure from contamination resulting, for example, from misdirected ink drops at start-up, ink misting, dust particles, etc.