Determination of displacement

Details Determination of displacement Determination of displacement

2005-01-11

2005-01-11

Fulton, Christopher W. (Department: 2859)

Geometrical instruments

Distance measuring

Scale reading position sensor

Reexamination Certificate

active

06839980

ABSTRACT:
Disclosed is an optical measurement scale14complementary scale reader10for determining displacement between the scale and reader. The scale14and reader10are adapted for use with a liquid C which provides optical communication between the scale14and the reader10. The liquid C is preferably machine coolant or oil. The scale is preferably a stainless steel strip having periodic markings thereon. The scale reader has a window16which may have a hard coating (30FIG.4) thereon, e.g. diamond-like carbon, to prevent surface damage. The scale and reader may be mutually displaced with a shortage of liquid without undue adverse affects. Rotary mutual displacement between the scale and reader is discussed.

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patent: 0 416 391 (1991-03-01), None
patent: A 62-135725 (1987-06-01), None
patent: WO 9823924 (1998-06-01), None

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