LIQUID CRYSTAL ELECTROMETER

Publishing Venue

Xerox Disclosure Journal

Abstract

As a probe (1) for an electrometer used to sense plate volt-ages on a charged photoreceptor, a liquid crystal (2), which changes light reflection and transmission in the presence of an electric field, is used. The probe (1) includes spaced base and face plates (3,4) with the liquid crystal (2) sup-ported on the base plate (3) The face plate (4) , which faces the charged photoreceptor (6) , has a viewing aperture (5) opposite the liquid crystal (2)

XEROX DISCLOSURE JOURNAL

LIQUID CRYSTAL ELECTROMETER Proposed Classification
Ray Case U~S. Cl, 324/32

Int, Cl, GOlr 5/28

4~ 2?

^/~3/*c~iii

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As a probe (1) for an electrometer used to sense plate volt-
ages on a charged photoreceptor, a liquid crystal (2), which
changes light reflection and transmission in the presence of
an electric field, is used. The probe (1) includes spaced
base and face plates (3,4) with the liquid crystal (2) sup-

ported on the base plate (3) The face plate (4) , which faces
the charged photoreceptor (6) , has a viewing aperture (5)
opposite the liquid crystal (2)

A light source (8) and detector (9) are disposed on opposing
sides of the liquid crystal (2) , the signal output (10) of the
detector being proportional to the light transmissibility of

the liquid crystal (2) which in turn reflects the charge
voltage on the photoreceptor.

Volume 2 Number 6 November/December 1977 91

XEROX DISCLOSURE JOURNAL

92 Volume 2 Number 6 November/December 1977