Apparatus for determining the position of a point on an object o

Details Apparatus for determining the position of a point on an object o Apparatus for determining the position of a point on an object o

1982-02-09

1985-02-12

Rosenberger, R. A.

Optics: measuring and testing

By polarized light examination

With light attenuation

33 20R, B43L 1316

Patent

active

044987773

ABSTRACT:
Apparatus for determining the position of a point on an object or the shape of a portion thereof comprising an object table; a measuring index; an optical viewing device; a part-reflecting mirror device arranged to enable an image of the measuring mark to be brought into coincidence with the said point or portion when the object is viewed through the optical viewing device; a movement effecting device for effecting relative movement of the object table and of the measuring index so as to bring the image of the measuring index into said coincidence; and, an indicator responsive to said movement effecting device for indicating the position of said point or the shape of said portion.

REFERENCES:
patent: 216460 (1879-06-01), Rosquist
patent: 2641840 (1953-06-01), Garriss
patent: 4399612 (1983-08-01), Scott

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