Device for determining surface proportion of a printed pattern f

Details Device for determining surface proportion of a printed pattern f Device for determining surface proportion of a printed pattern f

1986-11-21

1988-11-15

Wan, Gene

Optics: measuring and testing

By polarized light examination

With light attenuation

350380, G01B 1128

Patent

active

047844922

ABSTRACT:
A series of equidistant measuring heads is arranged at a uniform distance above a surface to be measured. Each head includes a light source emitting light through a narrow exit opening, and two light sensors arranged adjacent the opposite narrow sides of each opening. The light input characteristic of respective sensors is such that light reflected from the measured surface section is detected with a sensitivity which is inversely proportional to the different intensity of illumination of central and marginal points of the measured section.

REFERENCES:
patent: 3621268 (1971-11-01), Friedrich et al.
patent: 4213708 (1980-07-01), Lucas

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