Device for measuring light-sensitive pieces of material

摘要

A device for measuring the area of light-sensitive sheets (10) of material has a set of light barriers (14-0 to 14-7) to which short supply pulses are applied by an assigned supply circuit (16). The length of the supply pulses is dimensioned such that the additional exposure of the light-sensitive material that is obtained due to the measuring light of the light barriers (14-0 to 14-7) is so small that there is no additional blackening in the developed material. <IMAGE>