Browse Prior Art Database

Arc Protected Deflection Sensor

IP.com Disclosure Number: IPCOM000079761D
Original Publication Date: 1973-Aug-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Lillard, JW: AUTHOR [+2]

Abstract

The device prevents catastrophic failure of deflection sense preamplifiers in an ink jet Printer, due to high-voltage arcs from the upper deflection plate.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Arc Protected Deflection Sensor

The device prevents catastrophic failure of deflection sense preamplifiers in an ink jet Printer, due to high-voltage arcs from the upper deflection plate.

The close proximity of functional parts of an ink jet head assembly sometimes causes circuit component failures, due to high-voltage arcs caused by ink build- up. One such path for ink build-up and eventual arcing is from the upper deflection plate to the deflection sensor.

This structure shunts the arc to chassis ground and away from the deflection sense preamplifiers. In Fig. 1a, the protruding section of the outer ring 1 is aligned with the closest part of the upper one of a pair of deflection plates 2, and appropriately spaced at 3 to prevent arcing through air. The outer ring 1 is also pulled away from the inner rings 4 to allow a solid path to chassis ground, without allowing a bridge to either operational amplifier input 5 (Fig. 1b). Drops are sensed by the sense plate 6.

1

Page 2 of 2

2

[This page contains 3 pictures or other non-text objects]