Smoothness measuring device and recording apparatus to which the

Details Smoothness measuring device and recording apparatus to which the Smoothness measuring device and recording apparatus to which the

1989-08-25

1992-04-28

Fuller, Benjamin R.

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Thermal recording

25022728, 250560, 356376, G01D 1510, H01J 516, G01N 904

Patent

active

051092360

ABSTRACT:
A smoothness measuring device for measuring the smoothness of a surface to be measured has a light source for applying a light to the surface to be measured from an oblique direction thereto, a first detector for detecting the quantity light from the light source being reflected by the surface to be measured, a second detector for detecting the quantity of light from the light source being reflected by the surface to be measured, and a judging circuit for judging the smoothness of the surface to be measured on the basis of the results of the first and second detectors.

REFERENCES:
patent: 3732430 (1973-05-01), Hujer et al.
patent: 3922093 (1975-11-01), Dandliker et al.
patent: 3960451 (1976-06-01), Wirz et al.
patent: 4639152 (1987-01-01), Yamamoto et al.
patent: 4806777 (1989-02-01), Ulbers et al.

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