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1. (WO2018002634) DROPLET DEPOSITION APPARATUS AND TEST CIRCUIT THEREFOR

Pub. No.:    WO/2018/002634    International Application No.:    PCT/GB2017/051911
Publication Date: Fri Jan 05 00:59:59 CET 2018 International Filing Date: Fri Jun 30 01:59:59 CEST 2017
IPC: B41J 2/045
Applicants: XAAR TECHNOLOGY LIMITED
Inventors: BIRD, Neil Christopher
ISLAM, Mujahid-ul
Title: DROPLET DEPOSITION APPARATUS AND TEST CIRCUIT THEREFOR
Abstract:
A test circuit to determine the capacitance of an actuator element in an actuator element array, wherein the test circuit comprises: a controller; a source to generate test inputs; measurement circuitry to measure one or more test values on a test path between the test circuit and the actuator element;wherein the controller is configured to, for a test period: control a first switch associated with the actuator element to connect the actuator element to the test path; control the source to generate a first test input; and determine a total capacitance of the actuator element from a first test value generated in response to the first test input; and determine the capacitance of the actuator element (CACT) from the total capacitance (CPAR + CACT).