Head assembly for a jet drop recorder

US4010477A · kind A · utility

Assignee

• The Mead Corporation · US

Inventor

• James A. Frey · Winter Garden, US

Key dates

• Filing date: Jan 29, 1976
• Grant date: Mar 1, 1977
• Expiry date: Jan 29, 1996

Classification

• Technology area (CPC G): Physics
• CPC primary: G01D15/18
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A jet drop recorder has a head assembly which generates, charges, and switches rows of jet streams arranged along angularly oriented placement lines. The spacing and angular orientation of the placement lines are selected so as to produce an effectively uniform side-by-side spacing for the drop streams arranged along the placement lines. Each placement line may include a large number of drop streams, so that there is produced a recording head capable of high resolution recording. The drop streams are created and selectively charged by an orifice plate and a charge ring plate having orifices and charge rings in mutual registration. Below the charge ring plate there is a deflection electrode assembly comprising an insulative member provided with a series of angularly arranged teeth. Deflection electrodes are plated on opposite sides of the teeth and connected to sources of different electrical potential for generation of electrical deflection fields. Drops which are charged by application of a charging signal to their associated charge ring are deflected by the deflection field through which they are directed. The lower surfaces of the aforementioned teeth are configured to define ca…