Optical thickness measuring instrument for transparent work piec

Details Optical thickness measuring instrument for transparent work piec Optical thickness measuring instrument for transparent work piec

1990-10-26

1992-06-30

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356382, G01N 2186

Patent

active

051265796

ABSTRACT:
An optical thickness measuring instrument for transparent work-piece, in particular glass plates and transparent films, consists of a scanning head (10) with a servo-controlled measuring lens (24), a mirror (12) arranged perpendicularly to the axis of the latter and means (66 to 72) for positioning the work-piece (64) in parallel above the mirror (12). The servo control adjusts the measuring lens (24) so that a measuring light source (34) is focussed on the surface of the mirror. For this purpose, the measuring lens (24) must be adjusted by the associated servo drive (18, 20) depending on the thickness of the work-piece (64). The electrically measured (40) adjustment displacement of the measuring lens (24) is a measurement of the thickness of the work-piece (64). (FIG. 1).

REFERENCES:
patent: 3475615 (1969-10-01), Samuel
patent: 3743431 (1973-07-01), Cushing et al.
patent: 4310242 (1982-01-01), Genco et al.

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