ESV SENSE ACTIVATION MOVER (SHUTTER FUNCTION)
Original Publication Date: 1984-Jun-30
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
An electromagnetically activated device to move an electrode for an ESV (electrostatic voltmeter or electrometer for non-contact measurement of elestro-static voltages) and its associated circuitry from a zero (standby) to a sense (measure) position. The device provides that all moving parts (including the solenoid armature) are supported by pivots or bearings. Problems with con-tamination and wear of sliding parts are minimized. Also, the "pulled in" position is determined by magnetic force so there is no mechanical hard stop with its associated shock and vibration. In addition, the electrode can partially move down into (rather than simply move to behind) the window and thus spacing from electrode to sensed surface can be minimized. Finally, the moving electrode assembly can, at least partially, seal the window opening while in the zero and sense positions thus reducing entry of dirt into the ESV head.