Rubbing angle-measuring equipment, and manufacturing methods...

Details Rubbing angle-measuring equipment, and manufacturing methods... Rubbing angle-measuring equipment, and manufacturing methods...

2007-03-30

2008-12-30

Punnoose, Roy M (Department: 2886)

Optics: measuring and testing

Angle measuring or angular axial alignment

C349S191000

Reexamination Certificate

active

07471380

ABSTRACT:
A rubbing angle measuring equipment of the invention includes an light source unit, a measuring optical system, an imaging means, and an image evaluation means in which the measuring optical system is adapted such that a light from the light source unit passes by way of an illumination optical system and a polarizer to a rubbed measuring object and further passes by way of an analyzer and a focusing optical system to the imaging means, and the surface of the measuring object is focused to the imaging means, and in which image signals obtained by the imaging means are transmitted to the image evaluation means where signals having an intense periodicity in the image are detected, to measure the rubbing angle of the measuring object in a nondestructive manner, within a short period and at a high accuracy of 0.1° or more.

REFERENCES:
patent: 5394245 (1995-02-01), Sato
patent: 6831722 (2004-12-01), Ishikawa et al.
patent: 2003/0011732 (2003-01-01), Ishihara et al.
patent: 06-059230 (1994-03-01), None

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