Recorders – Thermal recording
Patent
1989-08-25
1992-04-28
Fuller, Benjamin R.
Recorders
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.
Watanabe Youichi
Yoshikawa Junichi
Canon Kabushiki Kaisha
Fuller Benjamin R.
Preston Gerald E.
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