Encapsulated measuring system

Details Encapsulated measuring system Encapsulated measuring system

1984-01-27

1986-06-10

Little, Willis

Geometrical instruments

Area integrators

Electrical

33125R, G01B 1104

Patent

active

045934711

ABSTRACT:
An encapsulated measuring system for measuring the relative position of two objects (such as the slide piece and bed of a processing machine) includes a housing which is connected with a first one of the two objects. This housing serves to mount a measuring scale which is scanned by a scanning unit connected to a second one of the two objects. In order to compensate for thermally induced length changes of the first object, the housing serves simultaneously as an expansion element for the scale and as an encapsulating element for the scale and the scanning unit. The housing is fastened at a first fastening point with the first object and at a second, spaced fastening point to the scale. The scale is arranged to be slightly shiftable with respect to the housing in the measuring direction by means of a suitable adhesive. Preferably, the housing provides a greater coefficient of thermal expansion than that of the first object and thermal expansion of the housing between the first and second fastening points serves to compensate for thermal expansion of the first object to which the housing is mounted.

REFERENCES:
patent: 3816002 (1974-06-01), Wieg
patent: 4170828 (1979-10-01), Ernst
patent: 4295742 (1981-10-01), Nelle et al.

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