Apparatus for optically measuring the distance between two grati

Details Apparatus for optically measuring the distance between two grati Apparatus for optically measuring the distance between two grati

1983-08-17

1985-12-24

Rosenberger, R. A.

Optics: measuring and testing

By polarized light examination

With light attenuation

356372, 356374, G01B 1102, G01B 1114

Patent

active

045602808

ABSTRACT:
The distance between first and second grating-like structures such as a shadow mask and a faceplate of a color picture tube or the size of pattern elements of the second grating-like structure such as black stripes formed on the inner surface of the faceplate is optically measured. The shadow mask has a periodic pattern of apertures or slots and the faceplate has a periodic pattern of the black stripes. An optical system located between a light source and an assembly of the first and second grating-like structures applies parallel rays of light to the assembly and is arranged to vary an incident angle of the parallel rays to the assembly. A photodetector detects the quantity of light passed through the assembly to produce an electric signal whose amplitude periodically varies with variation in the incident angle of the parallel rays to the assembly. A signal processing unit evaluates the distance between the first and second grating-like structures or the size of pattern elements forming the second grating-like structure on the basis of the electric signal from the photodetector.

REFERENCES:
J. Inst. Tv. Eng. of Japan 34, #2, pp. 141-146, (1980), "Automatic Inspection Method for Black Matrix-Screens of Color Picture Tubes".

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