Picture brightness measuring unit - comprises array of movable lenses and filter with pen recorder output

摘要

The brightness measuring unit comprises a tungsten filament lamp (1), a slit diaphragm (2) and an adjustable lens (3) mounted on a base. A plate (10) movable relative to the light axis contains a shaft (35) complete with a frame (5) for the test sample (9). A further support with an adjustable lens (11) and a movable optical filter (12) are mounted on the carrier (23). The optical pattern is divided into transparent and opaque areas. The light pattern is measured by the light scanner (14). The pen recorder (17) records the movement of the carrier (23), the sample frame (5) and the plate (10) to give an analysis from the optical filter (12) in four groups of thickness, 1mm-1, 4mm-1, 6mm-1, and 8mm-1.