Encapsulated photoelectric measuring system

Details Encapsulated photoelectric measuring system Encapsulated photoelectric measuring system

1984-02-29

1986-01-14

Evans, F. L.

Optics: measuring and testing

By polarized light examination

With light attenuation

33125C, 250237G, 356375, G01B 1114

Patent

active

045642940

ABSTRACT:
An encapsulated photoelectric measuring system for measuring the relative position of two objects includes a housing which encloses a scanning unit positioned to scan the graduation of a measuring scale. The housing defines a longitudinal slit closed by sealing elements, and a coupling member passes between the sealing elements and connects the scanning unit with one of the objects to be measured. In order to avoid optical disturbances of the beam path of the photoelectric scanning by liquid drops on the measuring scale, the scanning unit is hermetically sealed. The spacing between the surfaces of the scale acted upon by the light beams and the associated surfaces of the scanning unit is made so small that any liquid drops present on the surfaces of the scale in the region of the scanning unit are spread or formed into a continuously homogeneous wetted liquid layer.

REFERENCES:
patent: 3816002 (1974-06-01), Wieg
patent: 3816003 (1974-06-01), Litke
patent: 3833303 (1974-09-01), Burns et al.
patent: 4063086 (1977-12-01), Hirose
patent: 4136958 (1979-01-01), Nelle
patent: 4295742 (1981-10-01), Nelle et al.
patent: 4477726 (1984-10-01), Reichi

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