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OPTICAL ARRAY DROP SENSOR WITH CONTAMINATION CONTROL

IP.com Disclosure Number: IPCOM000025332D
Original Publication Date: 1984-Oct-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 82K

Publishing Venue

Xerox Disclosure Journal

Abstract

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.

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Page 1 of 2

XEROX DISCLOSURE JOURNAL

OPTICAL ARRAY DROP SENSOR WITH CONTAMINATION CONTROL U.S. Cl. 346/75 Chein-Hwa S. Tsao

Proposed Classification

Int. C1. Gold 15/18

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~ Volume 9 Number 5 September/October 1984

[This page contains 1 picture or other non-text object]

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OPTICAL ARRAY DROP SENSOR WITH CONTAMINATION CONTROL (Cont'd)

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.

One solution is to include, as part of the optical array drop sensor, a side-moving transparent medium as a mask 16 for contamination control of the surfaces of both the light emitters 12 and the sensors 14. Only the mask for the sensors is shown, since the one for the emitters is identical therewith. The masks could be a continuous roll (not shown) of transparent film, with the cleaning or decontami- nation of the film being conducted external of the optical array drop sensor.

As shown, the transparent mask 16 may be moved side-to-side as indicated by arrow 18. During-this movement, a flow of air or liquid...